JP2020038219A - Current detector - Google Patents

Abstract

To keep high accuracy of a position when forming a voltage detection terminal.SOLUTION: A current detector comprises a conductor made of conductive metal and a voltage detection terminal provided at the conductor. The voltage detection terminal is formed by inserting a rod-like metal to a through hole formed in the conductor and includes a first terminal part fit into the through hole and a second terminal projecting from the through hole.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a current detection device and a method for manufacturing the same.

  2. Description of the Related Art A shunt-type current detection method using a metal plate resistor is used in a current detection technology of an automobile battery. This method is also referred to as four-terminal measurement, and is a highly accurate current detection method.

  Elements for high-precision current detection include the type of resistance material, the shape and structure of the resistor, and the like. Furthermore, it depends on the positional accuracy of the voltage detection terminal for detecting the voltage. In particular, when the resistance value is 1 mΩ or less, the position of the voltage detection terminal greatly affects the detection accuracy.

  Patent Literature 1 discloses a technique for forming a voltage detection terminal by punching and screw formation. Patent Document 2 discloses a technique in which two plate-shaped base materials formed integrally with a resistor and measurement terminals are provided on each of the base materials.

JP 2012-531760 Gazette JP 2009-244065 A

  Patent Document 1 discloses a structure for detecting a voltage by screwing, but there is a possibility that the detection accuracy may be affected by tightening torque or looseness.

Patent Document 2 discloses a technique for welding a measurement terminal portion to the surfaces of base materials 12a and 12b, but it is difficult to maintain positional accuracy. In addition, when a structure in which the measurement terminals are surface-bonded is used, there is a problem that it is difficult to perform high-precision detection when uniform bonding is not obtained.
An object of the present invention is to maintain high positional accuracy when forming a voltage detection terminal.

According to one aspect of the present invention, there is provided a current detection device including a conductor made of a conductive metal, and a voltage detection terminal provided on the conductor, wherein the voltage detection terminal includes the conductor The present invention provides a current detection device having a first terminal portion formed by inserting a rod-shaped metal into a through-hole formed in a through-hole formed in the through-hole, and a second terminal portion protruding from the through-hole.
Since the first terminal portion is accommodated in the through-hole, the current detection terminal is well accommodated.

Preferably, the voltage detection terminal includes a flange portion, and the flange portion is in contact with the conductor. It is preferable to provide the flange portion at two places so as to sandwich the conductor. The voltage detection terminal is strongly fixed by the flange portion. It is preferable that at least one side of the opening of the through hole is formed with a concave portion having an enlarged inner diameter. The conductor includes a resistor and an electrode terminal joined to the resistor, and the voltage detection terminal can be applied to a configuration provided in the electrode terminal.
The conductor may include a narrow portion, and the space between the voltage detection terminals may be the narrow portion.

  According to another aspect of the present invention, a step of preparing a conductor, forming a narrow portion in a portion of the conductor, and forming a pair of through holes in the narrow portion is performed. And a step of erecting a voltage detection terminal in the through hole.

  The processing in the width direction of the conductor and the processing of forming the through hole are the same as the step of performing the processing, and the step of erecting the voltage detection terminal in the through hole is performed, thereby forming the voltage detection terminal. Position accuracy can be kept high.

  ADVANTAGE OF THE INVENTION According to this invention, the position precision at the time of forming a voltage detection terminal can be kept high.

FIG. 1 is a perspective view showing a configuration example of a current detection device using a resistor according to an embodiment of the present invention. It is a figure which shows the manufacturing method of the electric current detection apparatus using the resistor by 2nd Embodiment of this invention, and is a figure which shows a top view and sectional drawing as a set. FIG. 3 is a diagram following FIG. 2. FIG. 4 is a diagram following FIG. 3. It is a figure which shows the positional relationship between the junction part of a resistor and an electrode terminal, and a through-hole. FIG. 6A is a diagram illustrating a state in which the resistance value of the completed resistor is measured by a four-terminal measurement method. FIG. 6B is a diagram showing a configuration in which a display unit in which data such as a measured resistance value or the like in the form of a QR code or the like is written on the surface of the electrode of the current detection device. FIG. 3 is a diagram illustrating a circuit configuration example of a current detection module. 8A is a diagram illustrating an example of an external configuration of the current detection module, FIG. 8B is a cross-sectional view illustrating an example of a configuration of the current detection module, and FIG. FIG. 3 is a plan view illustrating a configuration example of a module. FIG. 14 is a flowchart illustrating an example of a processing flow according to the third embodiment. It is a figure which shows the manufacturing method of the resistor by 4th Embodiment of this invention, and is a figure which shows a top view and sectional drawing as a set. It is a figure following FIG. It is a figure showing the manufacturing method of the resistor by a 5th embodiment of the present invention, and is a figure showing a top view and a sectional view as a set. It is a figure following FIG. It is a figure showing the manufacturing method of the resistor by a 6th embodiment of the present invention, and is a figure showing a top view and a sectional view as a set. It is a figure showing the example of a terminal structure. It is a figure showing the example of a terminal structure. It is a figure showing the example of a terminal structure. It is a figure showing the example of a terminal structure.

  Hereinafter, a current detection device according to an embodiment of the present invention will be described in detail with reference to the drawings.

  In the present specification, welding refers to the application of heat or pressure or both to the joint of two or more members, and if necessary, the addition of an appropriate filler material, so that the joint is integrated with continuity. It refers to a joining method that forms a single member.

  Hereinafter, a current detection device according to an embodiment of the present invention will be described in detail with reference to the drawings, using a current detection device using a resistor having a butt structure in which end faces of a resistor and an electrode are butt-connected as an example. I do. This technique can be applied to a structure in which a resistor and an electrode are connected on the surface.

  In this specification, the direction in which the electrode-resistor-electrode of the resistor is arranged is referred to as a length direction, and the direction crossing the direction is referred to as a width direction.

(First Embodiment)
First, a current detection device using a resistor according to the first embodiment of the present invention will be described. FIG. 1 is a perspective view showing one configuration example of a current detection device using a resistor according to the present embodiment. A current detection device 1 using a shunt resistor (hereinafter, referred to as a “resistor”) illustrated in FIG. 1 includes two electrodes 5a (first electrodes), 5b (second electrodes), and electrodes 5a, 5b, a resistor 3 and a voltage detection terminal 17 are provided between the resistors 5b. Note that the portion including the resistor 3 and the electrodes 5a and 5b is also referred to as a conductor. The electrodes 5a and 5b are also called electrode terminals. Each of the electrodes 5a and 5b has an end-side main electrode portion (a portion of 5a and 5b excluding 5c and 5d is defined as a main electrode portion), and has a width of 2W ₂ than the main electrode portion. And narrow electrode portions 5c and 5d on the resistor 3 side. The resistor 3 is arranged between the narrow electrode portions 5c and 5d. Smaller electrode portions 5c, the length dimension of 5d to _{W 1.} This dimension _{W 1} is, for example, about 1 to 3 mm.

  Further, in this example, one voltage detection terminal 17 is provided for each of the narrow electrode portions 5c and 5d. By providing the voltage detection terminals 17 on the narrow electrode portions 5c and 5d, the distance between the voltage detection terminals 17 can be shortened, and the current measurement accuracy in four-terminal measurement can be improved.

  In the structure shown in FIG. 1, the width is provided by providing a concave portion 7 that enters the inside in the width direction in a partial region including the joining portions 13 a and 13 b formed by welding the resistor 3 and the electrode portions 5 a and 5 b. A narrowed or narrowed portion can be formed. In this case, the width of the narrow electrode portions 5c and 5d and the width of the resistor 3 are substantially equal. The narrow portion formed by the concave portion 7 is called a narrow portion or a narrow portion (the same applies hereinafter).

  According to the resistor according to the present embodiment, since concave portion 7 is formed in a partial region including joining portions 13a and 13b between resistor 3 and electrode portions 5a and 5b, stress generated in the entire shunt is reduced. It is possible to suppress concentration on the joining portions 13a and 13b of the current detection device 1.

Even when the concave portion 7 is formed about ₁ to 3 mm (W1) from the boundary between the resistor 3 and the electrodes 5a and 5b, a stress relaxation effect of 10% or more can be obtained. Further, by providing the concave portion 7, the current distribution in the current path can be stabilized, so that the TCR characteristic is improved.

  In FIG. 1, reference numeral 15 denotes a bolt hole. Reference numeral 11 denotes a hole for fixing the current detection substrate (hereinafter, omitted). Reference numeral 17 denotes a voltage detection terminal, which is provided in the narrow electrode portions 5c and 5d in this example. By providing the voltage detection terminals 17 on the narrow electrode portions 5c and 5d, the distance between the voltage detection terminals 17 can be shortened, and the current measurement accuracy in four-terminal measurement can be improved.

  Further, for example, a code display section 12 for displaying a code is formed on the upper surface of the first electrode section 5a. This code display will be described later.

(Second embodiment)
Next, a method of manufacturing a current detection device using a resistor according to the second embodiment of the present invention will be described. FIG. 1 shows an example of a current detection device using a resistor to be manufactured.

  2 to 4 are views showing a method of manufacturing the current detecting device using the resistor according to the present embodiment, and are a set of plan views and cross-sectional views.

As shown in FIG. 2A, first, a highly conductive electrode material 31 such as Cu is prepared.
As shown in FIG. 2B, a bolt hole 15 for screwing and a hole 33 for fitting a resistance material are formed in the electrode material 31 by a method such as pressing, cutting, or laser processing. One hole 33 is provided substantially at the center of the electrode material 31, and a pair of bolt holes 15 are provided at a position near the longitudinal end of the electrode material 31.

  As shown in FIG. 3C, a resistance material 35, which is prepared in advance and has substantially the same size as the hole 33 and has a higher resistance than the electrode material 31, is fitted into the hole 33. The outer surface of the resistance member 35 abuts the inner surface of the hole 33 to form, for example, a rectangular joint.

  For example, a long material (plate) can be cut out and used for both the electrode material 31 and the resistance material 35.

  As a material for the resistance member 35, a metal plate material such as a Cu-Ni-based, Cu-Mn-based, or Ni-Cr-based material can be used.

  As shown in FIG. 3D, a resistance member 35 is fixed to the electrode member 31 by a holding jig 41 or the like, and for example, an electron beam or a laser beam 43 is scanned as indicated by L1, and the electrode member 31 and the resistance member are scanned. By welding the joint portion with the electrode material 35, it is possible to form a joining base material in which the resistance material 35 is fitted into the central region of the electrode material 31 and joined.

  Since a through hole (hole 33) is provided in the electrode material 31 and the resistance material 35 is fitted into the through hole (hole portion 33), the electrode material 31 (work) is suppressed from being distorted even during welding with an electron beam or the like. When the holding jig 41 is used, the distortion of the work may be further suppressed.

  As shown in FIG. 4E, in order to determine the resistance value, for example, press working (45) for determining the width of the resistance material 35 is performed. Here, the concave portion 7 is formed by cutting a region including the widthwise end portion of the resistance member 35 (FIG. 4F). Then, by cutting from the side surface with respect to the width of the resistor 35 at the beginning of the fitting, the width of the resistor is reduced, and the resistance value can be adjusted. Furthermore, by cutting the starting point and the ending point of the welding, it is possible to suppress the variation in the joining at the joining portions 13a and 13b and to alleviate the stress.

  Further, in this step, a through hole 36 for providing a voltage detection terminal is also formed. Therefore, the positional relationship between the voltage detection terminals is stable, and the resistance value adjustment process and the voltage detection terminal positioning process are performed in the same process. Current detection becomes possible.

  As shown in FIG. 4G, a voltage detection terminal 17 is formed. For example, a bar-shaped terminal is inserted into the through-holes 36 of the narrow electrode portions 5c and 5d to be erected.

  Through the above manufacturing steps, a current detection device using the resistor shown in FIG. 1 can be manufactured.

  In addition, as a material of the voltage detection terminal 17, a copper-based alloy such as copper, brass, phosphor bronze, and Corson alloy is preferable.

  In addition, as shown in FIG. 3D, when performing EB welding or the like, the joining state between the starting end and the end of the welding location is not stable, and may be a starting point of damage. Therefore, as shown in FIG. 4E, by cutting including the start end and the end, in addition to the above-described effect of relaxing the stress, it is possible to maintain a good bonding state.

Further, as shown in FIG. 5, the resistor 3 and the electrode terminal 5c, the junction 13a between the 5d, and 13b, the positional relationship between the through-hole _36, so as to form separated by _{W 11.} That is, the joints 13a and 13b are alloyed by EB welding or the like, and it is difficult to perform processing for forming the through holes 36. Therefore, by forming the through hole avoiding the alloyed region, the through hole 36 can be formed with high accuracy.

  As described above, the manufacturing method according to the present embodiment has an advantage that the positional accuracy of the voltage detection terminal in the current detection device can be kept high.

(Third embodiment)
Next, a description will be given of a current detection device including a code display unit according to a third embodiment of the present invention. The code display unit 12 shown in FIG. 1 includes, for example, the following data. That is, the contents of the code are lot number, product name, characteristic value (resistance value, TCR value, etc.), used material (resistance material, etc.), manufacturer, manufacturing place, manufacturing date, user information (providing company name) Etc.). In particular, by displaying the combination of the lot number and the resistance value or the code display of the data to which the TCR value is added after the manufacture of the resistor, the user or the like provided with the current detection device can, for example, actually use the resistor. It is very convenient to be able to know accurate data and the like without measuring values and the like. The value indicating the characteristic is preferably an actual measurement value, but may be a design value. For example, the resistance value can be arbitrarily selected by recording the actual measurement value and the TCR value by recording the design value.

  FIG. 6 to FIG. 9 are views for explaining a current detection device provided with the code display unit according to the present embodiment and a method for manufacturing the same.

  As shown in FIG. 9, the process is started (Step S1: Start), and in Step S2, as described in the first and second embodiments, a current detection device using a resistor is created (FIG. 9). 1).

  Next, in step S3, the resistance value and the like of the resistor are measured. FIG. 6A is a diagram illustrating a state in which the resistance value of the completed resistor is measured by a four-terminal measurement method. The resistance value of the resistor is actually measured by a four-terminal measurement method using the voltage detection terminals 17, 17 and the electrodes 5a, 5b. In addition, necessary data (such as a TCR value) may be measured.

  Next, in step S4, as shown in FIG. 6B, the display unit 12 in which data such as the measured resistance value is in the form of a QR code or the like is written on, for example, the surface of the electrode 5a of the current detection device. That is, information such as characteristic values is converted and encoded, and printed on the electrodes.

  As a printing method at this time, a fiber laser, a semiconductor laser, a Green laser, an electron beam, a Yag laser, printing (inkjet printing), or the like can be used. Further, as a printing form, a QR code (registered trademark), a data matrix, a bar code, a two-dimensional code, or the like can be used.

  As a printing place (position), copper electrode portions 5a and 5b are preferable. It is preferable to avoid printing on the resistor 3 in consideration of the effect on the characteristics of the resistor.

  The method of printing on the copper electrode includes a method of shaving the surface thinly by laser marking, and a method of blackening by carbonizing.

  The user or the like provided with the current detecting device using the resistor reads the data of the QR code using, for example, a smartphone or a dedicated decoding device (step S11), and the process ends.

  By using the above-mentioned technology, the user of the resistor does not need to have the equipment for measuring the resistance value, and the resistance value can be managed and confirmed only by reading the code of the display unit 12 with a code reader or the like. Become. Therefore, traceability with digital data becomes possible. Problems such as incorrect mounting can also be avoided.

  Next, a configuration example of the current detection module will be described. FIG. 7 is a diagram illustrating a circuit configuration example of the current detection module. 8A is a diagram illustrating an example of an external configuration of the current detection module, FIG. 8B is a cross-sectional view illustrating an example of a configuration of the current detection module, and FIG. FIG. 3 is a plan view illustrating a configuration example of a module.

  The current detection module A shown in FIG. 7 includes the resistor 1, an amplifier 63 for amplifying a voltage signal between both terminals thereof, and an A / D converter 65 for A / D converting the signal amplified by the amplifier 63. And a microcomputer 67 that receives the digital signal output and performs an operation.

  At the time of energization, the voltage value obtained from the voltage detection terminal 17 of the current detection device 1 is amplified, converted into digital data, and the microcomputer 67 calculates the current value. The current value is sent to various electric devices via a data bus or the like.

  In the circuit shown in FIG. 7, various elements are mounted on the detection circuit unit 101 as shown in FIGS. 8A to 8C, and these elements are connected to a current detection device to constitute a module. The detection circuit unit 101 is provided with an exterior by molding as necessary. It is preferable that the code display unit 12 is located at a position that is not hidden by the detection circuit unit 101 or the mold. As shown in FIG. 8B, the PCB 105 is mounted on the current detection device 1, and is molded or sealed in a case as necessary to configure the current detection module A. The voltage detection terminal 17 penetrates from the back side to the front side of the PCB 105. The PCB 105 and the current detection device 1 are screwed and fixed by through holes indicated by reference numeral 11 in FIG. When the PCB 105 is formed of a heat conductive insulating material, it is suitable for detecting heat generation of the resistor. On the PCB 105, a semiconductor chip 111 and the like are mounted.

  FIG. 8C is a plan view of a portion of the PCB 105. The voltage detection terminal 17 exposed on the front side of the PCB 105 is connected to a contact 109 formed on the PCB 105 by soldering. The contact 109 and the semiconductor chip 111 are connected by a wire 107. The semiconductor chip 111 includes the above-described amplifier, A / D converter, and microcomputer. The semiconductor chip 111 is connected to the connector 141 and can output a current value.

  When incorporating the current detection device 1 into the current detection module A, the code display unit 12 of the current detection device 1 is read, and unique information such as a resistance value and a TCR value is recorded in a ROM in the microcomputer 67. Using this information, the CPU in the microcomputer 67 calculates the current value, so that more accurate current detection is possible. Further, the current sensor 1 or its surrounding temperature is measured by a temperature sensor (not shown), and the current value can be calculated after performing necessary correction using the TCR value.

(Fourth embodiment)
Next, a method of manufacturing a current detection device using a resistor according to the fourth embodiment of the present invention will be described. As an example of a current detection device using a resistor to be manufactured, the structure shown in FIG. 1 is taken as an example.

  10 and 11 are views showing a method of manufacturing the resistor according to the present embodiment, and are views showing a set of a plan view and a cross-sectional view.

  As shown in FIG. 10A, for example, a long flat plate-shaped resistance material 53 and an electrode material having higher conductivity than the resistance material 53 are formed. A first electrode material 51 and a second electrode material 51 are prepared.

  As shown in FIG. 10B, both end faces of the resistance material 53 and end faces of the first electrode material 51 and the second electrode material 51 are arranged so as to be in contact with each other to form a joint. Both joints 55 are welded with a laser beam 57 or the like as shown by reference numeral L1 to form one flat plate. Various adjustments regarding the resistance value and the shape can be made depending on the joining position.

  As shown in FIG. 10C, a plurality of through holes 36 are formed in the first electrode material 51 and the second electrode material 51 in the vicinity of the joint 55.

  As shown in FIG. 11D, the resistor material (bonding base material) including the bonding portion 55 is extended in the length direction where the width is increased in the region including the resistance material 53 and the electrode material 51 in the vicinity thereof. Cutting is performed using the existing punching die 59. As shown in FIG. 11E, the joints after cutting are indicated by reference numerals 13a and 13b.

  As shown in FIG. 11E, it is possible to form a resistor having the recessed portion 7 similar to that of the first embodiment and having the through holes 36 in the narrow electrode portions 5c and 5d. Next, as shown in FIG. 11F, a rod-shaped metal is inserted into the through-hole 36 to form the voltage detection terminal 17.

  Through the above steps, a large number of current detection devices having the main electrode portions 5a and 5b and the narrow electrode portions 5c and 5d and having the voltage detection terminals 17 can be manufactured.

  Although the bolt holes 15 and the holes 11 for fixing the current detection board shown in FIG. 1 are omitted in the description, whether or not to provide them is optional (also in the following description).

(Fifth embodiment)
Next, a method for manufacturing a current detection device using a resistor according to the fifth embodiment of the present invention will be described. An example of a current detection device using a resistor to be manufactured is shown in FIG. 1, for example.

  12 and 13 are views showing a method for manufacturing the resistor according to the present embodiment, and are views showing a set of a plan view and a cross-sectional view.

  The steps of forming the resistance material (joining base material) shown in FIGS. 12A and 12B are the same as the steps shown in FIGS. 10A and 10B.

  As shown in FIG. 13C, the joining base material is punched out by using a punching die 61 having a shape shown by a broken line, that is, a shape following the shape of a resistor having a concave portion in the length direction. In this punching step, a plurality of through holes 36 are formed in the first electrode material 51 and the second electrode material 51 in the vicinity thereof along the joint 53 in the same step. At this time, a large number of blanks may be punched in one process.

  As shown in FIG. 13D, a resistor having the concave portion 7 in a region including the joining portions 13a and 13b of the individualized members can be formed. Therefore, the same effect as in each of the first to third embodiments can be obtained.

  As shown in FIG. 13E, the voltage detection terminals 17 are formed on the narrow electrode portions 5c and 5d.

  Through the above steps, a large number of resistors having the main electrode portion and the narrow electrode portion as shown in FIG. 1 can be manufactured.

  According to this embodiment, the steps of determining the width of the resistor and forming the through-hole for erecting the voltage detection terminal can be performed at the same time, which simplifies the step and improves the positioning accuracy. This has the effect.

(Sixth embodiment)
Next, a method of manufacturing a current detection device using a resistor according to the sixth embodiment of the present invention will be described. An example of a current detection device using a resistor to be manufactured is shown in FIG. 1, for example. However, a joint between the electrode and the resistor is not formed.

  FIG. 14 is a diagram illustrating a method of manufacturing the resistor according to the present embodiment, and is a diagram illustrating a plan view and a cross-sectional view as a set.

  As shown in FIG. 14A, a resistance material 71 is prepared. The resistance material 71 is a single metal plate material such as Cu. Note that the resistance material 71 is also called a conductor.

  As shown in FIG. 14B, the resistance material 71 is punched out by using a punching die 75 as shown by a broken line, that is, in a shape following the shape of a resistor having a concave portion in the length direction. In this punching step, a plurality of through holes 36 are formed in the resistance material 71 in the same step. At this time, a large number of blanks may be punched in one process.

As shown in FIG. 14C, a resistor having the concave portion 7 and the through hole 36 can be formed.
As shown in FIG. 14D, the voltage detection terminals 17 are formed in the through holes 36 formed in the region where the recess 7 is formed.

  Through the above steps, a large number of current detection elements using resistors can be formed using only the resistance material.

  According to this embodiment, the steps of determining the width of the resistor and forming the through-hole for erecting the voltage detection terminal can be performed at the same time, which simplifies the step and improves the positioning accuracy. This has the effect.

(Seventh embodiment)
Next, a seventh embodiment of the present invention will be described. In this embodiment, a terminal structure in which a voltage detection terminal is provided on a resistor and a method for manufacturing the terminal structure will be described.

(1) Terminal structure 1
FIG. 15A is a cross-sectional view illustrating a configuration example of a terminal structure. In the structure shown in FIG. 15A, the voltage detection terminal 17 is provided in the through hole 36 formed in the electrode 5b (5d). In this structure, a flange 81 is formed at an intermediate portion of the voltage detection terminal 17. When the voltage detection terminal 17 is inserted into the through hole 36, the insertion position of the voltage detection terminal 17 is determined by the flange 81, and the insertion structure is stabilized. The voltage detection terminal 17 has a first terminal portion 17b that fits in the through hole 36 and a second terminal portion 17a that protrudes from the through hole 36.
Note that the voltage detection terminal 17 is preferably press-fitted into the through hole 36. Alternatively, welding may be performed.

(2) Terminal structure 2
FIG. 15B is a cross-sectional view illustrating a configuration example of the terminal structure 2. In the structure shown in FIG. 15B, the voltage detection terminal 17 is provided in the through hole 36 formed in the electrode 5b (5d). In this structure, a flange 83 is formed at one end of the voltage detection terminal 17. When the voltage detection terminal 17 is inserted into the through hole 36 from the lower side in the figure, the insertion position of the voltage detection terminal 17 is determined by the flange 83, and the insertion structure is stabilized. The voltage detection terminal 17 has a first terminal portion 17b that fits in the through hole 36 and a second terminal portion 17a that protrudes from the through hole 36. Hereinafter, the same applies.
Note that the voltage detection terminal 17 is preferably press-fitted into the through hole 36. Alternatively, welding may be performed.

(3) Terminal structure 3
FIG. 16A is a cross-sectional view illustrating a configuration example of the terminal structure 3. The structure shown in FIG. 16A is similar to the terminal structure 1 except that a side to be inserted into the through hole 36 has a protruding portion 85 protruding from the back.

(4) Terminal structure 4
FIG. 16B is a cross-sectional view illustrating a configuration example of the terminal structure 4. In the structure shown in FIG. 16B, in the terminal structure 3, a bent portion 87 that abuts on the back surface of the electrode 5 b is formed by bending a protruding portion 85 in which the side to be inserted into the through hole 36 protrudes backward. It is structured to be fixed to the back surface of. Further, the bent portion 87 may be welded to the back surface of the electrode 5b.

(5) Terminal structure 5
FIG. 17 is a diagram illustrating a configuration example of the terminal structure 5 and a manufacturing method. As shown in FIG. 17A, a flange 95 is provided at an intermediate portion of the voltage detection terminal 17, and a portion below the flange 95 is made thicker than an upper portion (terminal side). On the other hand, the through hole (36) formed in the narrow electrode portion 5d on the electrode 5b side is formed so that the diameter of the lower part is larger than that of the upper part. That is, the through-hole 36 is formed so that the upper through-hole 91 and the lower through-hole 93 (recessed portion whose inner diameter is widened) communicate with each other, and the recessed portion of the opening of the through-hole 36 is formed.

  As shown in FIG. 17B, when the voltage detection terminal 17 is inserted into the through hole 36 from above, the lower surface of the flange 95 comes into contact with the surface of the electrode 5b (5d).

  As shown in FIG. 17C, by crushing the portion AR <b> 1 below the flange 95, the portion AR <b> 1 below the flange 95 expands into the lower through hole 93 and has a large diameter so as to form the flange 97. Fill the space.

  According to this structure, the flange 95 and the flange 97 make it difficult for the voltage detection terminal 17 to come off from the current detection device 1, and the voltage detection terminal 17 can be firmly fixed to the current detection device 1.

In addition, as shown in FIG. 17C, the flange 95 can be used as a spacer (thickness t ₂₁ ) when the PCB 101 is mounted on the current detection device 1, which is convenient.

(6) Terminal structure 6
FIG. 18 is a diagram illustrating a configuration example of the terminal structure 6. The structure shown in FIG. 18 has recesses formed in the upper and lower openings of the through hole. In this case, in the structure shown in FIG. 17, the lower part can be formed by fitting the upper part into the concave part and driving the lower part into the concave part. According to this structure, since the upper flange 99 and the lower flange 97 are substantially flush with the upper and lower surfaces of the electrode 5b (5d), there is an advantage that unevenness does not interfere.

  In the above embodiment, the configuration and the like illustrated in the accompanying drawings are not limited to these, and can be appropriately changed within a range in which the effects of the present invention are exhibited. In addition, the present invention can be appropriately modified and implemented without departing from the scope of the object of the present invention.

  In addition, each component of the present invention can be arbitrarily selected, and an invention having the selected configuration is also included in the present invention.

  The present invention can be used for a current detection device.

DESCRIPTION OF SYMBOLS 1 ... Current detection device (resistor), 3 ... Resistor, 5a ... 1st electrode, 5b ... 2nd electrode, 5c, 5d ... Narrow electrode part, 7 ... Recessed part, 12 ... Code display part, 13a, 13b ... Junction, 17 ... Voltage detection terminal.

Claims (8)

A current detection device including a conductor made of a conductive metal and a voltage detection terminal provided on the conductor,
The voltage detection terminal has a first terminal portion that fits inside the conductor, and a second terminal portion that protrudes from the conductor,
A current detection device including a flange portion at an end of the first terminal portion opposite to a side on which the second terminal portion is arranged.   The current detection device according to claim 1, wherein a surface of the flange portion on a side of the first terminal portion is in contact with the conductor.   The current detection device according to claim 1, wherein the flange portion is accommodated in a concave portion of the conductor.   4. The current detection device according to claim 3, wherein the conductor has a through hole having a diameter smaller than a concave portion in which the flange portion is housed, and the small diameter through hole holds a periphery of the first terminal portion. 5.   The current detection device according to claim 1, wherein a peripheral edge of the flange portion is in contact with the conductor.   The current detection device according to any one of claims 1 to 5, wherein the first terminal portion is in contact with the conductor. The conductor includes a resistor and an electrode terminal joined to the resistor,
The current detection device according to any one of claims 1 to 6, wherein the voltage detection terminal is provided at the electrode terminal.   The current detection device according to claim 7, wherein the flange portion is not in contact with the resistor.

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