JP6564482B2 - Metal plate resistor - Google Patents

Description

  The present invention relates to a metal plate resistor in which electrodes made of a metal material are joined to both ends of a resistor made of a metal material.

  Metal plate resistors can detect large currents with high accuracy, and are widely used for applications such as battery charge / discharge current detection. When a metal plate resistor is connected and fixed to a wire harness, a bus bar or the like, it is fixed by bolting. However, when fixing by bolting, if there is a step in the mounting portion, the resistor is deformed to follow the step, the characteristics fluctuate, and there is a concern about deterioration of reliability. Therefore, a metal plate resistor including an electrode deformable portion that can be deformed by bolting has been proposed (see Patent Document 1).

  Furthermore, when a metal plate resistor is fixed to a bus bar or the like by bolt tightening, if stress due to tightening torque is applied in the bolt rotation direction, stress in the peeling direction is applied to the joint between the resistor and the electrode, causing resistance. Part of the joint between the body and the electrode may peel off and be damaged.

JP 2009-266977 A

  The present invention has been made on the basis of the above-described circumstances, and is a metal whose strength is increased so as to suppress peeling occurring on the joint surface between the resistor and the electrode when the metal plate resistor is fixed to the bus bar or the like by bolting. An object is to provide a plate resistor.

The metal plate resistor of the present invention comprises a resistor made of a metal material, an electrode made of a metal material having a higher conductivity than the resistor, and a voltage detection terminal provided on the electrode for detecting a voltage, A terminal hole penetrating the electrode is formed, the voltage detection terminal is inserted through the terminal hole, and one end of the voltage detection terminal inserted through the terminal hole is covered with the resistor. Features.

  It is preferable that a concave portion is formed at an end portion of the electrode joined to the resistor, the concave portion has a bottom surface, and the terminal hole is provided on the bottom surface. It is preferable that one end of the voltage detection terminal has a flange shape in contact with the bottom surface.

It is a perspective view of the resistor of 1st Example of this invention. It is a disassembled perspective view of the said resistor, and is a figure before mounting | wearing with a voltage detection terminal. It is a disassembled perspective view of the said resistor, and is a figure after mounting | wearing with the voltage detection terminal. It is a disassembled perspective view of the stage which fixes the said resistor to a bus bar. It is sectional drawing of the step which fixed the said resistor to the bus-bar. It is explanatory drawing which shows the effect of this invention. It is a perspective view of the example of a dimension of a crevice. It is a perspective view of the resistor of 2nd Example of this invention. It is a disassembled perspective view of the said resistor. It is a top view of the resistor of 3rd Example of this invention. It is a top view of the resistor of 4th Example of this invention. It is a top view of the resistor of the modification of 4th Example of this invention. It is a top view of the resistor of the modification of 4th Example of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 13. In addition, in each figure, the same code | symbol is attached | subjected and demonstrated to the same or equivalent member or element.

  FIG. 1 shows a metal plate resistor according to a first embodiment of the present invention. The resistor 10 includes a plate-like resistor 11 made of a metal material such as Cu-Mn-Ni, and a pair of plate-like electrodes 12 made of a metal material such as Cu having a higher conductivity than the resistor. 12 is composed. The resistor 11 and the electrode 12 are metal plate resistors for current detection in which the joining side end surfaces are joined by welding or pressure welding.

  The resistor 10 includes a concave portion 13 formed in a joint side end surface portion of the electrode 12 with respect to the resistor 11 (see FIG. 2-3), and the end portion of the resistor 11 is fitted into the concave portion and joined. ing. And the fixing hole 14 which can insert the volt | bolt formed in the electrode 12 is provided, and it can fix to a bus-bar etc. by bolting.

  The recess 13 is open to the first surface (upper surface) and the end surface of the electrode 12. The recess 13 is provided with wall portions A on both sides in the width direction of the resistor 11 in a direction substantially perpendicular to the penetration direction of the fixing hole 14. Therefore, by fitting the end portion of the resistor 11 into the recess 13 of the electrode, the bonding becomes strong and strong against the bolting stress as will be described later. That is, since there is a wall portion A that supports the resistor 11 from both sides with respect to the rotation direction of the bolt, the stress applied to the joint surface between the resistor and the electrode is reduced when the bolt is tightened, and the joint surface is peeled off. It becomes difficult.

  FIG. 2 is an exploded perspective view of the resistor itself. The concave portion 13 is formed in the end surface portion of the electrode 12 on the joint side with the resistor 11, and the concave portion 13 includes wall portions A on both side portions in the width direction of the resistor 11, and includes wall portions on the end surface portions in the longitudinal direction. A bottom surface portion 13b surrounded by a wall portion A and a wall portion of the end surface portion. The end portion of the resistor 11 is fitted into the recess 13 and joined to the bottom surface portion 13b and the wall portion A on both side portions and the wall portion of the end surface portion by welding or pressure welding.

  In brazing, Cu brazing, Ag brazing, or the like is applied in the recess 13, the end of the resistor 11 is fitted, heated and cooled to join the bonding surface of the resistor and the electrode with the brazing material. . For welding, laser beam welding, electron beam welding, or the like is used to join the bonding surfaces of the resistor and the electrode.

  The bottom surface portion 13b of the recess 13 has a terminal hole 13c penetrating through the second surface (back surface) opposite to the first surface (front surface). Voltage measurement is possible in the terminal hole, and the second surface (back surface). A terminal 15 protruding to the side can be inserted. Thereby, the standing of the voltage detection terminal 15 to the 2nd surface (back surface) side becomes easy. Further, the voltage detection accuracy can be improved by changing the position of the terminal hole 13c. For example, by making the position of the terminal hole 13c approach the resistor-side end face of the electrode 12 and making the voltage detection terminal 15 approach the resistor-side end face, voltage detection with reduced influence of the resistance component of the electrode can be performed.

  It is preferable that one end of the voltage detection terminal 15 has a flange shape that comes into contact with the bottom surface portion 13b. As a result, the voltage detection terminal 15 can be positioned and prevented from coming off. FIG. 3 shows a state in which the voltage detection terminal 15 is mounted in the terminal hole 13c. The terminal hole 13c includes a recess that engages with the flange portion of the voltage detection terminal 15, and the flange portion of the voltage detection terminal 15 is inserted into the recess so that the surface thereof is substantially flush with the bottom surface portion 13b ( (See FIG. 5). Then, the bottom surface portion 13b that is flattened by fitting the voltage detection terminal is covered with the end portion of the resistor 11, and soldering or welding is performed, so that the voltage detection terminal 15 can be prevented from being pulled out or retracted. In this state, the voltage detection terminal 15 protrudes toward the second surface (back surface).

  FIG. 4 is an exploded perspective view of this resistor assembly stage, and is a view in which the back surface side of the resistor of FIG. 1 is the front surface side. A voltage detection terminal 15 is provided in the vicinity of the end face of the electrode 12 on the resistor side so that the voltage generated by the current to be measured flowing through the resistor 11 can be taken out and detected. The bolt 18 is inserted into the fixing hole 14 of the electrode 12 and the fixing hole 17 of the bus bar 16 and the nut 19 is tightened, whereby the electrode 12 of the resistor can be fixed to the bus bar 16.

  FIG. 5 shows a state in which the resistor electrode 12 is assembled to the bus bar 16 and the bolt 18 is tightened to the nut 19. That is, both end portions of the resistor 11 are fitted into the recesses 13 formed in the end face portion of the electrode 12, and are joined and fixed by brazing or welding. Since the resistor 11 is also bonded and fixed to the bottom surface portion 13b of the recess 13, it is strong against stress in the vertical direction in the figure. In the vicinity of the end face on the resistor side of the pair of electrodes 12, the voltage detection terminal 15 protrudes toward the second surface side of the electrode with the flange portion 15 a contacting the resistor 11.

  FIG. 6 shows a stress distribution during assembly in FIG. When the bolt 18 is tightened in the rotation direction, a stress indicated by Fθ is generated in the rotation direction in the figure. As a result, a stress Fα is generated in the direction perpendicular to the longitudinal direction of the resistor 11 in the vicinity of the joint surface between the resistor 11 and the electrode 12. On the other hand, since the concave portion 13 of the electrode 12 has wall portions A on both sides in the width direction of the resistor 11, the end portion of the resistor 11 is supported from both sides against the stress Fθ in the rotation direction of the bolt 18. There is wall A. For this reason, the stress Fα at the time of bolting does not act on the joint surface between the resistor 11 and the electrode 12. Therefore, there is no possibility that the joint surface between the resistor 11 and the electrode 12 is peeled off when the bolt is tightened, and the reliability of the resistor can be improved.

  FIG. 7 shows an example of a preferred recess dimension. The length X of the recess 13 is preferably about 0.5 to 2 times the thickness of the resistor 11. The width Y of the wall portion A is preferably 0.5 times or more the thickness of the resistor 11. The height Z of the recess 13 is also preferably 0.5 times or more the thickness of the resistor 11. These dimensions are set so as to be suitable for reinforcement by the wall portion A so that the stress Fα generated by bolting does not affect the joint surface between the electrode 12 and the resistor 11.

  8 and 9 show a metal plate resistor 10a according to a second embodiment of the present invention. In this embodiment, the recess 23 penetrates between the first surface and the second surface and does not have a bottom surface. That is, the thickness of the resistor 11 is the same as the thickness of the electrode 12, and the recess 23 has a wall portion A on both sides in the width direction of the resistor 11 in a direction substantially perpendicular to the penetration direction of the fixing hole 14. . Accordingly, both ends of the resistor 11 are supported by the pair of wall portions A of the recess 23, and the structure is stronger than the first embodiment against bolting. Moreover, since the recessed part 23 has penetrated between the 1st surface and the 2nd surface, positioning of the resistor 11 is also easy. The point that the joining of the resistor 11 and the electrode 12 is formed by brazing or welding is the same as in the first embodiment.

  FIG. 10 shows a metal plate resistor 10b according to a third embodiment of the present invention. In this embodiment, a plurality of insertion holes 13 c for the voltage detection terminal 15 are formed in the bottom surface 13 b of the recess 13. Thereby, the voltage detection terminal 15 can be erected by inserting the voltage detection terminal 15 into one of the holes 13c. With the arrangement of the voltage detection terminals, the voltage detection terminals can be erected at an appropriate position corresponding to the current distribution, and the TCR characteristics and the like can be adjusted. It is also possible to inspect characteristics using the structure of the present embodiment at the development stage, find the optimum position, and form the insertion hole only at that position in the commercialization stage.

  11-13 show a metal plate resistor according to a fourth embodiment of the present invention. In these embodiments, a single voltage detection terminal insertion hole 13c is formed in the bottom surface 13b of the recess 13, the voltage detection terminal 15 is inserted, and linear through holes 25A, 25B that prevent current flow on the electrode side. 25C is formed. In FIG. 11, a through-hole 25A in a direction orthogonal to the current direction is formed, in FIG. 12, a through-hole 25B cut obliquely from the resistor-side electrode end surface is formed, and in FIG. A through-hole 25C is formed in a key-like shape in a direction perpendicular to. By forming the through holes 25A, 25B, and 25C outside the terminal hole 13c, current can be prevented from flowing in the vicinity of the terminal hole 13c, the influence of the resistance component of the electrode is reduced, and more accurate current detection is achieved. It becomes possible to further adjust the TCR characteristics and the like.

  Although one embodiment of the present invention has been described so far, it is needless to say that the present invention is not limited to the above-described embodiment, and may be implemented in various forms within the scope of the technical idea.

  The present invention can be suitably used for a metal plate resistor fixed to a bus bar or the like by bolting.

Claims (5)

A resistor made of a metal material, an electrode made of a metal material having a higher conductivity than the resistor, and a voltage detection terminal provided on the electrode for detecting a voltage;
A terminal hole penetrating the electrode is formed,
The voltage detection terminal is inserted through the terminal hole,
The current detecting metal plate resistor, wherein the resistor contacts and covers one end portion of the voltage detection terminal inserted through the terminal hole. A recess is formed at the end of the electrode that joins the resistor,
The recess has a bottom surface,
The metal plate resistor for current detection according to claim 1, wherein the terminal hole is provided in the bottom surface portion. 3. The metal plate resistor for current detection according to claim 2 , wherein one end of the voltage detection terminal has a flange shape in contact with the bottom surface portion. A resistor made of a metal material, an electrode made of a metal material having a higher conductivity than the resistor, and a voltage detection terminal provided on the electrode for detecting a voltage;
  A recess is formed at the end of the electrode that joins the resistor,
  The recess has a bottom surface, and a terminal hole penetrating the electrode is formed on the bottom surface,
  The voltage detection terminal is inserted through the terminal hole,
  The current detecting metal plate resistor, wherein the resistor contacts and covers one end portion of the voltage detection terminal inserted through the terminal hole.   5. The current detecting metal plate resistor according to claim 4, wherein one end of the voltage detection terminal has a flange shape in contact with the bottom surface portion.

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