Current detection device

Abstract

The present application provides a current detection device capable of improving stability of a connection portion of a substrate connected to a shunt resistor. The current detection device (1) has: a substrate (3) having a current detection portion; a connection terminal (5) having a first connection portion (51) connected to the substrate, an intermediate portion (53) protruding from the first connection portion in a manner orthogonal to the substrate, a second connection portion (52) connected to a shunt resistor (4), and a bent portion (54) connecting the second connection portion and the intermediate portion; a resin-made holding member (6) integrally molded with the intermediate portion and holding the intermediate portion, and supported by the substrate; a fixed terminal (7) having a base portion held by the holding member and a protruding portion (72), and the protruding portion being soldered to the substrate; a housing (2) having an opening (22) exposing the second connection portion; and the shunt resistor arranged on an outer side of the housing in a manner opposite to the opening, and fastened to the second connection portion by a threaded member.

Description

Technical Field

[0001] This invention relates to a current detection device. Background Technology

[0002] Previously, there were techniques for using shunt resistors to detect current. Patent Document 1 discloses a battery control device comprising: a current detection circuit electrically connected to a shunt resistor having multiple connecting pins, for detecting the battery current flowing through the shunt resistor; a substrate on which the current detection circuit is mounted; and a connector mounted on the substrate.

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent Application Publication No. 2020-201059 Summary of the Invention

[0006] The technical problem that the invention aims to solve

[0007] In a structure that electrically connects a shunt resistor to a substrate, it is preferable to improve the stability of the connection portion in the substrate.

[0008] The purpose of this invention is to provide a current detection device that can improve the stability of the connection portion in a substrate connected to a shunt resistor.

[0009] Technical means for solving problems

[0010] The current detection device of the present invention is characterized by comprising: a substrate having a current detection portion; a connection terminal having: a first connection portion electrically connected to the substrate; an intermediate portion protruding from the first connection portion orthogonally to the substrate; a second connection portion electrically connected to a shunt resistor; and a bending portion connecting the second connection portion to the intermediate portion; a resin retaining member integrally formed with and retaining the intermediate portion, and supported by the substrate; a fixing terminal having: a base held by the retaining member; and a protrusion protruding from the retaining member, the fixing terminal fixing the retaining member to the substrate by welding the protrusion to the substrate; a housing accommodating the substrate, the connection terminal, the fixing terminal, and the retaining member, and having an opening exposing the second connection portion; and a shunt resistor disposed on the outside of the housing opposite to the opening and fastened to the second connection portion by a threaded member.

[0011] Invention Effects

[0012] In the current detection device of the present invention, the retaining component and the middle portion of the connecting terminal are integrally formed, thereby improving mechanical strength. Furthermore, since the connecting terminal has a bent portion between the middle portion and the second connecting portion, external forces acting on the second connecting portion are less likely to be transmitted to the first connecting portion. Further, the retaining component is securely fixed to the substrate by a fixing terminal. The current detection device according to the present invention improves the stability of the connecting portion in the substrate connected to the shunt resistor. Attached Figure Description

[0013] Figure 1 This is a perspective view of the current detection device involved in the implementation method.

[0014] Figure 2 This is an exploded perspective view of the current detection device involved in the implementation method.

[0015] Figure 3 This is a perspective view of the retaining components and terminals involved in the implementation method.

[0016] Figure 4 This is a perspective view of the connection terminals involved in the implementation method.

[0017] Figure 5 This is a perspective view of the fixed terminal involved in the implementation method.

[0018] Figure 6 This is a diagram illustrating the assembly process of the current detection device involved in the embodiment.

[0019] Figure 7 This is a cross-sectional view of the current detection device according to the embodiment.

[0020] Symbol Explanation

[0021] 1: Current detection device

[0022] 2: Shell, 3: Substrate, 3a: First surface, 3b: Second surface

[0023] 4: Shunt resistor; 5: Connection terminal; 5A: First connection terminal; 5B: Second connection terminal

[0024] 6: Retaining component; 6a: First end; 6b: Second end

[0025] 7: Fixed terminal; 8: Threaded component; 9: Cover; 10: Nut; 11: Threaded component

[0026] 21: Insertion port; 22: Opening

[0027] 41: First through hole; 42: Second through hole; 43: Third through hole

[0028] 51: First connecting part; 52: Second connecting part; 53: Middle part; 53a: Inclined surface

[0029] 54: Bending section; 55: Main body; 56: Internal thread section

[0030] 61: First leg; 62: Second leg; 63: Third leg

[0031] 71: Base; 71a: Inclined surface; 72: Protrusion

[0032] X: First direction, Y: Second direction, Z: Third direction Detailed Implementation

[0033] Hereinafter, a current detection device according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to this embodiment. Furthermore, the constituent elements of the following embodiments include elements that are readily conceived by those skilled in the art or substantially the same elements.

[0034] [Implementation Method]

[0035] Reference Figures 1 to 7 The implementation method will be described below. This implementation method relates to a current detection device. Figure 1 This is a perspective view of the current detection device involved in the implementation method. Figure 2 This is an exploded perspective view of the current detection device according to the embodiment. Figure 3 This is a perspective view of the retaining component and terminals involved in the embodiment. Figure 4 This is a perspective view of the connection terminals involved in the implementation method. Figure 5 This is a perspective view of the fixed terminal involved in the implementation method. Figure 6 This diagram illustrates the assembly process of the current detection device involved in the embodiment. Figure 7 This is a cross-sectional view of the current detection device according to the embodiment.

[0036] like Figures 1 to 3 As shown, the current detection device 1 of this embodiment includes a housing 2, a substrate 3, a shunt resistor 4, a connecting terminal 5, a holding member 6, a fixing terminal 7, and a threaded member 8. The current detection device 1 is disposed, for example, in a vehicle battery, to detect the charging and discharging current of the battery. The current detection device 1 is a so-called shunt-type current sensor. That is, the current detection device 1 allows current to flow through the shunt resistor 4, and calculates the current value using Ohm's law based on the voltage drop when energized and the resistance value of the shunt resistor 4.

[0037] The shunt resistor 4 shown is a rectangular flat plate. Busbars are connected to both ends of the shunt resistor 4. One busbar is connected, for example, to the negative terminal of the battery. The other busbar is connected, for example, to the grounding part of the vehicle body. Battery monitoring and control are performed based on the current value detected by the current detection device 1.

[0038] like Figure 2 As shown, the current detection device 1 of this embodiment has a pair of connection terminals 5 connecting the shunt resistor 4 to the substrate 3. The current detection unit 31 of the substrate 3 is connected to the shunt resistor 4 via the connection terminals 5. The current detection unit 31 is, for example, a current detection circuit. The current detection device 1 of this embodiment has a holding member 6 for holding the connection terminals 5. As will be explained below, the holding member 6 can improve the current detection accuracy and improve the stability of the connection between the connection terminals 5 and the substrate 3.

[0039] The housing 2 houses the substrate 3, the connecting terminal 5, the retaining member 6, and the fixing terminal 7. The housing 2 is molded from, for example, an insulating synthetic resin. The illustrated housing 2 has a cylindrical shape. One end of the housing 2 has an insertion port 21. The substrate 3, the connecting terminal 5, the retaining member 6, and the fixing terminal 7 are inserted into the housing 2 through the insertion port 21. A guide portion 23 for guiding the substrate 3 and a locking portion for locking the substrate 3 are provided on the inner side of the housing 2.

[0040] In the following description, the insertion direction of the substrate 3 relative to the housing 2 is referred to as the "first direction X". The first direction X is the axial direction of the cylindrical housing 2. Furthermore, the width direction of the housing 2 and the substrate 3 is referred to as the "second direction Y", and the height direction of the housing 2 is referred to as the "third direction Z". The third direction Z is the thickness direction of the substrate 3. The first direction X, the second direction Y, and the third direction Z are orthogonal to each other.

[0041] A recess 24 for accommodating a shunt resistor 4 is provided on the inner side of the housing 2 in the first direction X. The recess 24 is formed on the outer side of the housing 2. The shape of the recess 24 when viewed from above is rectangular, corresponding to the shape of the shunt resistor 4. Two openings 22 are provided in the recess 24. The two openings 22 are arranged along the second direction Y. The shape of the openings 22 is, for example, rectangular. The substrate 3 is inserted into the housing 2 until the second connecting portion 52 of the connecting terminal 5 is opposite to the opening 22. The housing 2 locks the substrate 3 in place with the second connecting portion 52 exposed from the opening 22.

[0042] The housing 2 holds two nuts 10. The nuts 10 are pressed into the housing 2 along a first direction X. The shunt resistor 4 has a pair of first through holes 41, a pair of second through holes 42, and a pair of third through holes 43. The through holes 41, 42, and 43 are arranged along a second direction Y. The first through holes 41 are located on the innermost side, and the third through holes 43 are located on the outermost side.

[0043] The first through hole 41 is a through hole corresponding to the threaded component 8. The threaded component 8 is inserted through the first through hole 41 and screwed into the second connecting portion 52 of the connecting terminal 5. The second through hole 42 is a through hole corresponding to the threaded component 11. The threaded component 11 is a fastening component that fixes the shunt resistor 4 to the housing 2. The threaded component 11 is inserted through the second through hole 42 and screwed into the threaded hole of the housing 2. The housing 2 may also hold a nut corresponding to the threaded component 11.

[0044] The third through hole 43 is a through hole corresponding to the nut 10. Each of the aforementioned busbars is fixed to the shunt resistor 4 by a threaded component (not shown) and the nut 10. Each busbar may also have a through hole corresponding to the third through hole 43. In this case, the threaded component is inserted through the through hole of the busbar and the third through hole 43 and screwed into the nut 10.

[0045] A connector 32 is disposed on the substrate 3. The current detection unit 31 can also be connected to an external monitoring device via the connector 32. The cover 9 engages with the housing 2, closing the insertion port 21 of the housing 2. The cover 9 has a through hole corresponding to the connector 32.

[0046] like Figure 3 As shown, the retaining member 6 holds two connecting terminals 5 and one fixed terminal 7. The illustrated retaining member 6 is molded from insulating synthetic resin. The retaining member 6 is integrated with the two connecting terminals 5 and the fixed terminal 7 by insert molding. The fixed terminal 7 is insulated relative to the connecting terminals 5. The retaining member 6 has a generally cuboid shape.

[0047] Regarding the connecting terminal 5, the retaining member 6, and the fixing terminal 7, the description will be conducted using directions X, Y, and Z with the retaining member 6 fixed to the substrate 3 and housed within the housing 2. The two connecting terminals 5 include a first connecting terminal 5A and a second connecting terminal 5B. The two connecting terminals 5 are disposed at the first end 6a of the retaining member 6. The fixing terminal 7 is disposed at the second end 6b of the retaining member 6. The first end 6a and the second end 6b are ends of the retaining member 6 in the first direction X. That is, the fixing terminal 7 is disposed away from the two connecting terminals 5 in the first direction X. The fixing terminal 7 is disposed between the two internally threaded portions 56 in the second direction Y. That is, the fixing terminal 7 is disposed between the two internally threaded portions 56 when viewed from above the substrate 3.

[0048] Two connecting terminals 5 are arranged along the second direction Y. The first connecting terminal 5A is located at one end of the second direction Y, and the second connecting terminal 5B is located at the other end of the second direction Y. A fixing terminal 7 is located at the center of the second direction Y. That is, the position of the fixing terminal 7 in the second direction Y is between the first connecting terminal 5A and the second connecting terminal 5B, for example, at the center.

[0049] like Figure 4 As shown, the connecting terminal 5 has a first connecting portion 51, a second connecting portion 52, a middle portion 53, and a bent portion 54. The connecting terminal 5 is formed of a conductive metal such as copper. The connecting terminal 5 is formed, for example, from a metal plate. The first connecting portion 51 is physically and electrically connected to the substrate 3. The first connecting portion 51 is exemplified as having a flat plate shape or a prism shape. The first connecting portion 51 is inserted into a through hole in the substrate 3 and soldered to the substrate 3. The first connecting portion 51 is connected to the current detection unit 31 via the circuit pattern of the substrate 3.

[0050] The second connecting portion 52 is fastened to the shunt resistor 4 via a threaded component 8. The illustrated second connecting portion 52 has a flat body 55 and a cylindrical internally threaded portion 56. The body 55 is rectangular in shape when viewed from above. The internally threaded portion 56 protrudes from the center of the body 55 toward the first connecting portion 51. An internal thread is formed on the inner circumferential surface of the internally threaded portion 56 by tapping. A guiding inclined surface 56a is provided at the entrance of the internally threaded portion 56.

[0051] The intermediate portion 53 is sealed in the resin of the retaining member 6 and held by the retaining member 6. The intermediate portion 53 is the portion between the first connecting portion 51 and the second connecting portion 52. The intermediate portion 53 is continuous with the first connecting portion 51 and is located on the extension line of the first connecting portion 51. The intermediate portion 53 is exemplified as a flat plate. The intermediate portion 53 has a tapered shape in which its width gradually narrows as it moves toward the first connecting portion 51 along the third direction Z. The sides of the intermediate portion 53 have a plurality of inclined surfaces 53a. The inclined surfaces 53a are inclined in such a way that they approach the centerline of the intermediate portion 53 as it moves toward the first connecting portion 51 along the third direction Z. A stepped portion 53b is provided at the end of the intermediate portion 53. The stepped portion 53b is disposed at the end of the side of the intermediate portion 53 on the side of the second connecting portion 52.

[0052] The bent portion 54 connects the intermediate portion 53 and the second connecting portion 52. The illustrated bent portion 54 bends in such a way that the second connecting portion 52 is orthogonal to the first connecting portion 51. The first connecting portion 51 and the intermediate portion 53 extend along a third direction Z, and the second connecting portion 52 extends along a first direction X. In side view, the bent portion 54 has an arc-shaped bend. The width Wd2 of the bent portion 54 is narrower than the width Wd1 of the intermediate portion 53 and narrower than the width Wd3 of the second connecting portion 52. That is, compared to the intermediate portion 53 and the second connecting portion 52, the bent portion 54 has lower rigidity and is more prone to elastic deformation.

[0053] like Figure 5As shown, the fixing terminal 7 has a base 71 and a protrusion 72. The fixing terminal 7 is formed of a metal plate. The fixing terminal 7 may also be conductive. The base 71 is encapsulated in resin within the retaining member 6 and is held by the retaining member 6. The protrusion 72 is a portion that protrudes from the retaining member 6 along a third direction Z.

[0054] The base 71 has a flat plate shape and extends along a third direction Z. The base 71 has a tapered shape in which its width gradually narrows as it moves towards the protrusion 72 along the third direction Z. The sides of the base 71 have a plurality of inclined surfaces 71a. The inclined surfaces 71a are inclined in such a way that they approach the centerline of the base 71 as it moves towards the protrusion 72 along the third direction Z. A stepped portion 71b is provided at the end of the base 71. The stepped portion 71b is disposed at the end of the base 71 on the side opposite to the side opposite to the protrusion 72.

[0055] The protrusion 72 is illustrated in the shape of a flat plate or a prism. The protrusion 72 is inserted into a through hole in the substrate 3 and soldered to the substrate 3. The fixing terminal 7 fixes the retaining member 6 to the substrate 3 by soldering the protrusion 72 to the substrate 3.

[0056] like Figure 3 As shown, the first connecting portion 51 of the connecting terminal 5 and the protrusion 72 of the fixing terminal 7 protrude from the holding member 6 along a third direction Z. The first connecting portion 51 and the protrusion 72 protrude toward a first side Z1. The first side Z1 is the substrate 3 side as viewed from the holding member 6. That is, the first connecting portion 51 and the protrusion 72 protrude from the holding member 6 toward the substrate 3 side.

[0057] The second connecting portion 52 and the bent portion 54 of the connecting terminal 5 protrude from the retaining member 6 along the third direction Z. The second connecting portion 52 and the bent portion 54 protrude toward a second side Z2. The second side Z2 is the side of the shunt resistor 4 as viewed from the retaining member 6. That is, the second connecting portion 52 and the bent portion 54 protrude from the retaining member 6 toward the shunt resistor 4. The main body 55 and the internal thread portion 56 of the second connecting portion 52 are opposed to the retaining member 6 in the third direction Z. The internal thread portion 56 protrudes from the main body 55 toward the retaining member 6 in the third direction Z.

[0058] The retaining member 6 has three legs 61, 62, and 63 protruding toward the first side Z1. The three legs 61, 62, and 63 are supported by the base plate 3. The first leg 61 is disposed on the first end 6a side, and the second leg 62 and the third leg 63 are disposed on the second end 6b side.

[0059] The first leg 61 is located between the two first connecting portions 51. The first leg 61 protrudes from the first end 6a toward the first side Z1. When viewed from the first direction X, the first leg 61 is rectangular in shape. The front end face of the first leg 61 is placed on the substrate 3 and supported by the substrate 3.

[0060] The second leg 62 and the third leg 63 are disposed at the corners of the retaining member 6. The second leg 62 and the third leg 63 are disposed such that the protrusion 72 of the fixing terminal 7 is sandwiched in the middle. In other words, the second leg 62 is disposed on one side of the second direction Y relative to the protrusion 72, and the third leg 63 is disposed on the other side of the second direction Y relative to the protrusion 72. When viewed from the first side Z1, the second leg 62 and the third leg 63 are approximately L-shaped and bent at right angles. The second leg 62 and the third leg 63 each have a portion extending in the first direction X and a portion extending in the second direction Y, respectively. The front end faces of the second leg 62 and the third leg 63 are mounted on the substrate 3 and supported by the substrate 3.

[0061] The retaining member 6 has protrusions 64 and 65 protruding towards the first side Z1. Protrusion 64 protrudes from the second leg 62, and protrusion 65 protrudes from the third leg 63. The protrusions 64 and 65 are cylindrical in shape. The substrate 3 has positioning portions corresponding to the protrusions 64 and 65. The positioning portions are recesses or holes formed in the substrate 3. By inserting the protrusions 64 and 65 into the positioning portions, the retaining member 6 is positioned relative to the substrate 3.

[0062] like Figure 2 As shown, the retaining member 6 is placed on the first surface 3a of the substrate 3. The substrate 3 has through holes corresponding to the connecting terminal 5 and the fixing terminal 7. The first connecting portion 51 of the connecting terminal 5 and the protrusion 72 of the fixing terminal 7 are inserted into the corresponding through holes. The first connecting portion 51 and the protrusion 72 are fixed to the second surface 3b of the substrate 3 by soldering. The first connecting portion 51 is connected to the circuit pattern of the substrate 3. The protrusion 72 is connected to the fixing pad, etc.

[0063] exist Figure 6 The diagram shows a housing 2 that houses the connecting terminals 5 in designated positions. The second connecting portion 52 of the connecting terminals 5 protrudes from the opening 22 of the housing 2. A shunt resistor 4 is mounted opposite the opening 22 in a recess 24 of the housing 2 and is fixed relative to the housing 2 by a threaded member 11. The second connecting portion 52 of each connecting terminal 5 is fastened to the shunt resistor 4 by a threaded member 8. The threaded member 8 is inserted through a first through hole 41 in the shunt resistor 4 and engages with the internal thread 56 of the connecting terminal 5.

[0064] Figure 7 The XZ section including the threaded component 8 and the connecting terminal 5 is shown. Figure 7 The cross-section is along the central axis of the threaded component 8. For example... Figure 7As shown, the first through hole 41 of the shunt resistor 4 is opposite to the internal thread portion 56 in the third direction Z. The threaded component 8 engages with the internal thread portion 56, so that the body 55 of the connecting terminal 5 contacts the shunt resistor 4. The threaded component 8 is conductive, enabling the shunt resistor 4 to be electrically connected to the second connecting portion 52.

[0065] The first connecting portion 51 of the connecting terminal 5 is connected to and fixed to the substrate 3 via solder 12. The middle portion 53 protrudes from the first connecting portion 51 toward the shunt resistor 4 in an orthogonal manner to the substrate 3. The protrusion 72 of the fixing terminal 7 is fixed to the substrate 3 via solder 12. The retaining member 6 is placed on the substrate 3 and fixed to the substrate 3 via solder 12.

[0066] Here, when the threaded member 8 is screwed into the internal thread portion 56, an external force is applied to the second connecting portion 52. The connecting terminal 5 and the retaining member 6 of this embodiment can suppress the transmission of this external force to the first connecting portion 51. When an external force is applied to the second connecting portion 52, the bent portion 54 of the connecting terminal 5 can elastically deform to absorb the external force. Furthermore, when the threaded member 8 is inserted into the internal thread portion 56 in an inclined position, by elastically deforming the bent portion 54, the internal thread portion 56 can follow the threaded member 8.

[0067] Furthermore, the retaining member 6 is integrally formed with the middle portion 53 of the connecting terminal 5, and retains the middle portion 53. Therefore, the retaining member 6 can suppress the transmission of external force acting on the second connecting portion 52 to the first connecting portion 51. For example, the retaining member 6 is supported by the substrate 3 and can support the middle portion 53 against the third-direction Z force.

[0068] Furthermore, the retaining member 6 is fixed to the substrate 3 via the fixing terminal 7. Therefore, the force borne by the retaining member 6 is distributed to the connection between the fixing terminal 7 and the substrate 3. The fixing terminal 7 is disposed separately from the middle portion 53 of the connecting terminal 5 in the first direction X. Therefore, the fixing terminal 7 can stabilize the force and torque of the retaining member 6 relative to the first direction X.

[0069] The current detection device 1 of this embodiment can reduce the impact of external forces on the connection between the connection terminal 5 and the substrate 3, and improve the stability of the connection. Therefore, the current detection device 1 of this embodiment can transmit an electrical signal from the shunt resistor 4 to the substrate 3 without compromising accuracy, ensuring the accuracy of current measurement. In addition, by integrating the shunt resistor 4 with the upper surface of the housing 2, the proprietary area of ​​the device can be reduced.

[0070] As described above, the current detection device 1 of this embodiment includes: a substrate 3 having a current detection section 31, a connection terminal 5, a resin holding member 6, a fixing terminal 7, a housing 2, and a shunt resistor 4. The connection terminal 5 has a first connection portion 51, a middle portion 53, a second connection portion 52, and a bent portion 54. The first connection portion 51 is electrically connected to the substrate 3. The middle portion 53 protrudes from the first connection portion 51 in a manner orthogonal to the substrate 3. The second connection portion 52 is electrically connected to the shunt resistor 4. The bent portion 54 connects the second connection portion 52 to the middle portion 53.

[0071] The retaining member 6 is integrally formed with the intermediate portion 53 to hold the intermediate portion 53 and is supported by the substrate 3. The fixing terminal 7 has a base 71 held by the retaining member 6 and a protrusion 72 protruding from the retaining member 6. The fixing terminal 7 fixes the retaining member 6 to the substrate 3 by welding the protrusion 72 to the substrate 3. The housing 2 houses the substrate 3, the connecting terminal 5, the fixing terminal 7, and the retaining member 6. The housing 2 has an opening 22 that exposes the second connecting portion 52. The shunt resistor 4 is disposed on the outside of the housing 2 opposite to the opening 22. The shunt resistor 4 is fastened to the second connecting portion 52 by a threaded member 8.

[0072] In the current detection device 1 of this embodiment, the retaining member 6 and the middle portion 53 of the connecting terminal 5 are integrally formed, thus improving mechanical strength. Furthermore, since the connecting terminal 5 has a bend 54 between the middle portion 53 and the second connecting portion 52, external forces acting on the second connecting portion 52 are less likely to be transmitted to the first connecting portion 51. Furthermore, the retaining member 6 is securely fixed to the substrate 3 by the fixing terminal 7. Therefore, the current detection device 1 of this embodiment can improve the stability of the connection portion in the substrate 3 connected to the shunt resistor 4. For example, the stability of the welded portion between the first connecting portion 51 and the substrate 3 is improved.

[0073] The second connecting portion 52 in this embodiment has: a flat body 55 that contacts the shunt resistor 4; and a cylindrical internally threaded portion 56 that protrudes from the body 55 toward the substrate 3. The shunt resistor 4 has a first through hole 41, and the first through hole 41 is positioned opposite the internally threaded portion 56. The threaded member 8 is inserted into the first through hole 41 and screwed into the internally threaded portion 56 to fasten the second connecting portion 52 to the shunt resistor 4. In this structure, the external force when the threaded member 8 is screwed into the internally threaded portion 56 is absorbed by the bending portion 54.

[0074] In this embodiment, the retaining member 6 holds the middle portion 53 of the two connecting terminals 5. Two internal threaded portions 56 are opposite to the retaining member 6. Viewed from above on the substrate 3, the fixing terminal 7 is disposed between the two internal threaded portions 56. Therefore, the fixing terminal 7 can adequately support the retaining member 6 to withstand external forces when the threaded member 8 engages with each internal threaded portion 56.

[0075] Furthermore, the shape of the bent portion 54 is not limited to the illustrated shape. For example, the bent portion 54 is not limited to one bent part. The bent portion 54 may be bent in two or more places.

[0076] The shape of the retaining component 6 is not limited to the illustrated shape. The retaining component 6 may also retain multiple fixing terminals 7. In this case, the multiple fixing terminals 7 are respectively soldered to the substrate 3.

[0077] The contents disclosed in the above-described embodiments can be appropriately combined and implemented.

Claims

1. A current detection device, characterized in that, have: A substrate having a current detection unit; A connection terminal having: a first connection portion electrically connected to the substrate; and a middle portion protruding from the first connection portion in a manner orthogonal to the substrate. A second connecting portion, which is electrically connected to a shunt resistor; and a bending portion, which connects the second connecting portion to the intermediate portion; A resin retaining member is integrally formed with and holds the intermediate portion, and the retaining member is supported by the substrate; A fixing terminal having: a base held by the retaining member; and a protrusion protruding from the retaining member, the fixing terminal fixing the retaining member to the substrate by welding the protrusion to the substrate; A housing that houses the substrate, the connecting terminal, the fixing terminal, and the retaining member, and has an opening that exposes the second connecting portion; as well as The shunt resistor is disposed on the outside of the housing opposite to the opening and is fastened to the second connection portion by a threaded component.

2. The current detection device as described in claim 1, characterized in that, The second connecting portion has: a flat plate-shaped main body that contacts the shunt resistor; and a cylindrical internally threaded portion that protrudes from the main body toward the substrate side. The shunt resistor has a through hole, and the through hole is positioned opposite the internal thread portion. The threaded component is inserted into the through hole and screwed into the internal thread to secure the second connection and the shunt resistor.

3. The current detection device as described in claim 2, characterized in that, The retaining member holds the middle portion of the two connecting terminals. The two internally threaded portions are opposite to the retaining member. When viewed from above, the fixing terminal is positioned between the two internal threaded portions.

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