JPH0384876A - Electrode terminal connection structure of power element - Google Patents

Abstract

PURPOSE:To reduce the resistance of a connection and to increase the space of the connection by attaching or welding a metal plate with a hole, with a high rigidity and a good area accuracy, to an electrode terminal plate, and fastening through this metal plate. CONSTITUTION:A flexible electrode terminal plate 1 is provided, and a wiring plate 2 connected electrically to the electrode terminal plate 1, and a metal plate 3 with a hole, with a high rigidity and processed at a high area accuracy, are welded to the electrode terminal plate 1. That is, the electrode terminal plate 1 and the wiring plate 2 hold the metal plate 3 with a hole, and a screw is inserted and fastened through the hole 1a of the terminal plate 1, the hole 3a of the metal plate 3, and the hole 2a of the wiring plate 2. The metal plate 3 with a hole has a high rigidity, it can be processed at a high area accuracy, and can suppress the resistance of the connection extremely. As a result, the effective contact area between the metal plates can be increased simply even in a small space. And the area accuracy at the contact surface is increased, and the contact resistance can be reduced easily.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a connection structure between an electrode terminal plate of a power device and a wiring board.

[Conventional technology]

Conventionally, the conventional connection between the electrode terminal board and the wiring board is as shown in FIG. Ta. Note that "A" in the figure shows the state before connection, and "A" in the figure shows the state after connection.

[Problem to be solved by the invention]

In a low on-resistance element for passing a large current, the contact resistance of the terminal connection portion becomes a factor that cannot be ignored.

In order to lower the contact resistance of the terminal connection part, it is necessary to increase the contact area, but for this purpose it is necessary to improve the surface precision of the terminal board. In order to improve the surface accuracy, it is necessary to increase the rigidity of the terminal, but this is contrary to the ease of the bottom mold.
For the above reasons, conventional methods have been to increase the number of contact points by restricting the degree of freedom in shape or by making the terminal area very wide and using multiple screws. However, this method has problems such as an increase in the mounting area and restrictions on low impedance design, which is a problem during high-speed operation.

The present invention was made to solve these problems, and aims to provide an electrode terminal connection structure that reduces the resistance of the connection part and does not increase the space of the connection part.

[Means to solve the problem]

In the electrode terminal connection structure of a power device according to the present invention, in order to reduce the resistance at the connection between the electrode terminal board and the wiring board, the perforated electrode terminal board and the perforated wiring board are tightened by inserting screws into the holes. At this time, a perforated metal plate with high rigidity and good surface precision was bonded or welded to the electrode terminal plate, and the electrode terminal plate was tightened through this metal plate.

In addition, instead of fixing the above-mentioned perforated metal plate to the electrode terminal plate, it is possible to make holes in foamed metal or thin wire metal and sandwich something impregnated with conductive liquid or conductive soft plastic into the perforated metal plate. I tried to tighten it with screws.

Furthermore, in order to achieve the same purpose, the electrode terminal board and the wiring board may be provided with folds, and these folds may be overlapped and tightened with screws. After wrapping and folding the obi sections, the drawing board was tightened with screws.

[Effect]

In the electrode terminal connection structure of the power device according to the present invention, the surface accuracy can be improved by the metal plate interposed between the electrode terminal plate and the wiring board, and the structure in which the impregnated metal plate is interposed can improve the surface accuracy. By absorbing the unevenness of the contact surface between the electrode terminal board and the wiring board, the connection resistance can be reduced. Further, by providing pleats or extending belt portions, the contact area can be increased and the resistance of the connection portion can be reduced, without increasing the space of the connection portion.

〔Example〕

Embodiments of the electrode terminal connection structure of a power device according to the present invention will be described below with reference to FIGS. 1 to 4.

In FIG. 1, 1 is a flexible electrode terminal plate, and 2 is a wiring board electrically connected to this electrode terminal plate 1. In FIG. 3
is a highly rigid perforated metal plate processed with high surface accuracy.
It is welded to the electrode terminal plate 1. Electrode terminal plate 1 and wiring board 2 sandwich perforated metal plate 3, and hole 1a of electrode terminal plate 1
, screws are inserted into the holes 3a of the metal plate 3 and the holes 2a of the wiring board 2 and tightened.

The perforated metal plate 3 has high rigidity and is easy to process with surface precision.
The resistance of the connection part can be suppressed as much as possible.

In the embodiment shown in FIG. 2, a foamed metal or thin wire metal is formed with holes between an electrode terminal plate 1 and a wiring board 2, and a conductive liquid or a conductive soft plastic is filled in this. The impregnated metal plate (simply referred to as impregnated metal plate) 5 is sandwiched between the two and tightened with screws. According to this, when the impregnated metal plate 5 is tightened, irregularities on the surfaces of the electrode terminal plate 1 and the wiring board 2 are absorbed by the deformation of the surface and the conductive liquid, and an effective contact area is ensured.

FIG. 3 shows another embodiment of the invention, which is t
The electrode terminal plate 1 and the wiring board 2 are provided with a pleat hole 6 having a hole 6a and a pleat 7 having a hole 7a, respectively, and the wiring board 2 is placed between the electrode terminal plate 1 and the pleat 6 above the pleat 6. The folds 7 are combined and screwed together so that the folds 7 overlap.

Note that the number of pleats to be added is not limited to one, but two or more may be provided.

FIG. 4 shows still another embodiment of the present invention, in which extending strips 8 and 9 are provided at the tips of the electrode terminal board 1 and the wiring board 2, respectively, and are thinner than the main body. ,9
Elongated holes 8a and 9a are provided in the center. When connecting,
Either wrap the extended band portions 8.9 overlappingly as shown in Figure 4, or fold them overlappingly as shown in Figure 4C.
, 9a through the holes 1a and 2a and tighten them. Both the device shown in FIG. 3 and the device shown in FIG. 4 can be accommodated in a narrow space while the connecting portions are in contact over a wide area.

〔Effect of the invention〕

As described above, according to the present invention, it is possible to easily obtain a wide effective contact area between metal plates in a small space, and it also has the effect of increasing the surface precision of the contact surface and reducing contact resistance more easily than before. be.

[Brief explanation of drawings]

1 to 4 are perspective views showing embodiments of the present invention, FIG. 4 A is a view before connection, opening and C are views after connection, and FIG. 5 is a perspective view showing a conventional device. 1 is an electrode terminal board, 1a is a hole, 2 is a wiring board, 2a is a hole, 3 is a perforated metal plate, and 5 is a foamed material. A perforated plate made of metal or thin metal wire, 6 and 7 are folds, and 8° and 9 are extended strips. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (4)

[Claims] (1) In a device in which a perforated wiring board is stacked on a perforated electrode terminal plate of a power element, and screws are inserted into the holes and screwed, a highly rigid perforated metal plate is glued to the electrode terminal plate in advance or An electrode terminal connection structure for a power element, characterized in that the electrode terminal plate and the wiring board are welded and screwed together via the metal plate. (2) In a device in which a perforated wiring board is stacked on a perforated electrode terminal board of a power element, and screws are inserted into the holes and secured with screws, a foamed wiring board is placed between the electrode terminal board and the wiring board. Electrode terminal connection for a power element, characterized in that a metal material or thin wire metal is formed into a perforated plate shape and impregnated with a conductive liquid or conductive soft plastic, and then fixed with a screw. structure. (3) In a device in which a perforated wiring board is stacked on a perforated electrode terminal board of a power element, and screws are inserted into the holes and screwed, either or both of the above electrode terminal board or the wiring board is attached. An electrode terminal connection structure for a power element, characterized in that it has the above pleat structure, and the electrode terminal board and the wiring board are screwed together by polymerizing the pleats. (4) In a device in which a perforated wiring board is stacked on a perforated electrode terminal board of a power element, and screws are inserted into the holes and secured with screws, an extension band is provided at the tip of the electrode terminal board and the wiring board, respectively. An electrode terminal for a power element, characterized in that both extending band parts are rolled or bent overlappingly to bring them into electrical contact, and the electrode terminal board and the wiring board are screwed together. connection structure.