JP7399647B2 - Shunt resistance type current detection device - Google Patents

Description

The present invention relates to a shunt resistance type current detection device.

Conventionally, a current value using a shunt resistor is detected by using a current detection device to detect a potential difference in a shunt resistor whose both ends are connected to a bus bar. The shunt resistance type current detection device is used for detecting current values for battery charging and discharging, current values for motors of hybrid vehicles and electric vehicles, etc.

Japanese Patent Application Publication No. 2004-221160

A shunt resistance type current detection device is configured to detect a current between a pair of detection parts provided at separate locations in a shunt resistance (for example, see Patent Document 1). When the current between the pair of detection parts is stable, a potential difference with little variation can be detected. In order to stabilize the current between the pair of detection parts, it is necessary to maintain a state in which the connecting surfaces of the shunt resistor and the bus bar are in uniform contact with each other. However, it is difficult to stably provide a shunt resistance type current detection device in which the connection surfaces of the shunt resistance and the bus bar are in uniform contact with each other due to numerous technical problems.

The present invention has been made in view of the above, and is intended to stabilize the current between the detection conductors and detect a potential difference with little variation even if the connection surfaces of the shunt resistor and the bus bar are unevenly connected to each other. To provide a shunt resistance type current detection device that can perform

In a shunt resistance type current detection device including a flat shunt resistor electrically connected to a flat first bus bar and a flat second bus bar, the shunt resistor is connected to the first bus bar and the second bus bar. It has a shunt resistance main body to be connected, and a plurality of detection conductors that are in contact with the shunt resistance main body, the detection conductor has a detection part and a contact part, and the detection part is connected to a current detection device. and connected to the contact portion, and the contact portion extends from at least one end to the other with respect to the shunt resistor main body in a direction crossing the current flow direction in the shunt resistor main body. Characterized by contact.

In the shunt resistance type current detection device according to the present invention, the contact portion of the detection conductor is in contact with the shunt resistance main body at least from end to end in a direction intersecting the current flow direction in the shunt resistance main body. , the detection conductor can regulate the current flow in the shunt resistor body, and even if the connection surfaces of the shunt resistor and the bus bar are unevenly connected, the current between the detection conductors is stable and the potential difference with little variation is maintained. This has the effect of improving current detection accuracy.

FIG. 1 is a perspective view showing a shunt resistance type current detection device in Embodiment 1. FIG. 2 is a partially exploded perspective view of the shunt resistance type current detection device according to the first embodiment. FIG. 3 is a side view of the first bus bar in Embodiment 1. FIG. 4 is a plan view of the first bus bar in the first embodiment. FIG. 5 is a side view of the second bus bar in Embodiment 1. FIG. 6 is a plan view of the second bus bar in Embodiment 1. FIG. 7 is a front view of the shunt resistor in Embodiment 1. FIG. 8 is a perspective view of the shunt resistor in Embodiment 1. FIG. 9 is a diagram showing the flow of current in a shunt resistor to be compared. FIG. 10 is a diagram showing the flow of current in the shunt resistor in the first embodiment. FIG. 11 is a perspective view showing a shunt resistance type current detection device in Embodiment 2. FIG. 12 is an exploded perspective view of the shunt resistance type current detection device according to the second embodiment. FIG. 13 is a perspective view showing a shunt resistance type current detection device in Embodiment 3. FIG. 14 is an exploded perspective view of a shunt resistance type current detection device in Embodiment 3.

EMBODIMENT OF THE INVENTION Below, embodiment of the shunt resistance type current detection apparatus 1 based on this invention is described in detail based on drawing. Note that the present invention is not limited to the embodiments described below. Furthermore, the components in the embodiments described below include those that can be easily replaced by those skilled in the art, or those that are substantially the same. Furthermore, various omissions, substitutions, and changes may be made to the constituent elements in the embodiments described below without departing from the gist of the invention.

[Embodiment 1]
A first embodiment will be described with reference to FIGS. 1 to 10. First, a shunt type current detection device 1 according to the present embodiment will be described with reference to the drawings. FIG. 1 is a perspective view showing a shunt resistance type current detection device in Embodiment 1. FIG. 2 is a partially exploded perspective view of the shunt resistance type current detection device according to the first embodiment. FIG. 3 is a side view of the first bus bar in Embodiment 1. FIG. 4 is a plan view of the first bus bar in the first embodiment. FIG. 5 is a side view of the second bus bar in Embodiment 1. FIG. 6 is a plan view of the second bus bar in Embodiment 1. FIG. 7 is a front view of the shunt resistor in Embodiment 1. FIG. 8 is a perspective view of the shunt resistor in Embodiment 1.

In the following description, the illustrated X-axis direction is the front-rear direction of the shunt resistance type current detection device 1 in this embodiment, and is the arrangement direction of the first bus bar 310, the second bus bar 320, and the shunt resistor 2. The Y-axis direction is a direction perpendicular to the X-axis direction, the vertical direction of the shunt resistance type current detection device 1 in this embodiment, and the thickness direction of the first busbar flat part 315a and the second busbar flat part 325b. be. The Z-axis direction is a direction perpendicular to the X-axis direction and the Y-axis direction, and is the width direction of the shunt resistance type current detection device 1 in this embodiment, and the thickness direction of the shunt resistance 2. X1 is the front direction, X2 is the rear direction, Y1 is the front direction, Y2 is the back direction, Z1 is the upward direction, and Z2 is the downward direction.

The shunt resistance type current detection device 1 is assembled into a junction box (not shown). Junction boxes are mounted on automobiles, for example, and are used to mount fuses and the like and distribute power. The junction box incorporates a current detection device 5 and a power supply device 4, which will be described later. The shunt resistance type current detection device 1 is electrically connected to a power supply device 4 and a current detection device 5, respectively.

The shunt resistance type current detection device 1 includes a shunt resistance 2, a first bus bar 310, and a second bus bar 320, as shown in FIGS. 1 and 2. The first bus bar 310 and the second bus bar 320 are arranged apart from each other in the arrangement direction, and a gap S is provided between the first bus bar 310 and the second bus bar 320. As for the first bus bar 310 and the second bus bar 320, the first bus bar 310 is provided on the front side, and the second bus bar 320 is provided on the rear side. A shunt resistor 2 is arranged between the first bus bar 310 and the second bus bar 320, that is, the shunt resistor 2 is provided in the gap 6, and the shunt resistor 2 is electrically connected to the first bus bar 310 and the second bus bar 320. A shunt resistance type current detection device 1 is configured by connecting the current detection device 1 to the shunt resistance type current detection device 1.

The detailed configuration of the shunt resistance type current detection device 1 will be explained. As shown in FIGS. 3 and 4, the first bus bar 310 has a flat plate shape and is made of a conductive metal such as Cu. The first busbar 310 has a first busbar connecting portion 310a, a first busbar flat portion 315a, and a first busbar bent portion 314a that connects the first busbar connecting portion 310a and the first busbar flat portion 315a.

The first busbar connecting portion 310a is formed into a flat plate shape extending upward from the front end in the arrangement direction of the first busbar flat portion 315a. The first bus bar connecting portion 310a has a first standing wall portion 311a, a second standing wall portion 312a, and a notch portion 313a. The cutout portion 313a is a space extending downward from the upper end of the first busbar connection portion 310a, and divides a part of the first busbar connection portion 310a into two parts in the width direction, that is, a first It is divided into a standing wall portion 311a and a second standing wall portion 312a. The cutout portion 313a has an expanded portion 316a that extends in the width direction at the lower end thereof, so that the first vertical wall portion 311a and the second vertical wall portion 312a can be easily deformed in the direction of separating the first vertical wall portion 311a and the second vertical wall portion 312a from each other in the width direction. I can do it. Therefore, the first connecting portion 20A of the shunt resistor 2, which will be described later, can be easily inserted. The first vertical wall portion 311a is formed on one side of the cutout portion 313a, and has a first contact surface 317a. The first contact surface 317a is a plane including the arrangement direction and the up-down direction. The second vertical wall portion 312a is formed on the other side of the notch portion 313a, and has a second contact surface 318a. The second contact surface 318a is a plane including the direction intersecting the arrangement direction and the up-down direction when viewed from the up-down direction, and is an inclined surface facing forward and toward the back when viewed from the up-down direction. . The first contact surface 317a and the second contact surface 318a are in contact with the first contact surface 201A and the second contact surface 202A of the first connection section 20A, respectively, and the first bus bar 310 and the shunt resistor 2 are electrically connected. Ru. Here, the notch portion 313a is formed as a gap into which the first connecting portion 20A can be press-fitted.

The first bus bar plane portion 315a is formed into a flat plate shape extending in the arrangement direction. The first bus bar plane portion 315a is electrically connected to the power supply device 4 at the rear end in the arrangement direction. The current of the power supply device 4 flows from the first bus bar 310 toward the shunt resistor 2.

As shown in FIGS. 5 and 6, the second bus bar 320 has a flat plate shape and is made of a conductive metal such as Cu. The second busbar 320 has a second busbar connecting portion 320b, a second busbar flat portion 325b, and a second busbar bending portion 324b that connects the second busbar connecting portion 320b and the second busbar flat portion 325b.

The second bus bar connecting portion 320b is formed in a flat plate shape extending upward from the rear end in the arrangement direction of the second bus bar flat portion 325b. The second bus bar connecting portion 320b has a first standing wall portion 321b, a second standing wall portion 322b, and a cutout portion 323b. The cutout portion 323b is a space extending downward from the upper end of the second busbar connection portion 320b, and divides a part of the second busbar connection portion 320b into two parts in the width direction, that is, a first It is divided into a standing wall section 321b and a second standing wall section 322b. The cutout portion 323b has an expanded portion 326b that extends in the width direction at the lower end thereof, so that the first vertical wall portion 321b and the second vertical wall portion 322b can be easily deformed in the direction of separating the first vertical wall portion 321b and the second vertical wall portion 322b from each other in the width direction. I can do it. Therefore, the second connecting portion 20B of the shunt resistor 2, which will be described later, can be easily inserted. The first vertical wall portion 321b is formed on one side of the notch portion 323b, and has a first contact surface 327b. The first contact surface 327b is a plane including the arrangement direction and the up-down direction. The second standing wall portion 322b is formed on the other side of the notch portion 323b, and has a second contact surface 328b. The second contact surface 328b is a plane including the direction intersecting the arrangement direction and the up-down direction when viewed from the up-down direction, and is an inclined surface facing toward the rear and back when viewed from the up-down direction. . The first contact surface 327b and the second contact surface 328b are in contact with the first contact surface 201B and the second contact surface 202B of the second connection portion 20B, respectively, and the second bus bar 320 and the shunt resistor 2 are electrically connected. Ru. Here, the notch portion 323b is formed as a gap into which the second connecting portion 20B can be press-fitted.

The second bus bar plane portion 325b is formed into a flat plate shape extending in the arrangement direction. The second bus bar plane portion 325b is electrically connected to the power supply device 4 at the front end in the arrangement direction. The current of the power supply device 4 flows from the shunt resistor 2 toward the second bus bar 320.

As shown in FIGS. 7 and 8, the shunt resistor 2 has a flat plate shape and includes a shunt resistor main body 21 and a detection conductor 22. The shunt resistor main body 21 has a rectangular shape when viewed from the width direction, and is made of a conductive metal such as a Cu-Mn-Ni metal, a Cu-Ni metal, or a Ni-Cr metal. The shunt resistance main body portion 21 has connection portions 20 at both ends in the arrangement direction. The connecting portions 20 are a first connecting portion 20A corresponding to the first bus bar 310 and a second connecting portion 20B corresponding to the second bus bar 320.

The first connecting portion 20A electrically connects the shunt resistor 2 to the first bus bar 310 by contacting the first bus bar 310. The first connecting portion 20A has a first contact surface 201A and a second contact surface 202A. The first contact surface 201A corresponds to the first contact surface 317a, is a rear end region of the rear side surface of the shunt resistor main body section 21, and is a plane including the arrangement direction and the vertical direction. be. The second contact surface 202A corresponds to the second contact surface 318a and faces the first contact surface 201A in the width direction. The second contact surface 202A is formed to extend to both ends of the shunt resistance main body 21 in the vertical direction, and is a plane including the direction intersecting the arrangement direction and the vertical direction when viewed from the vertical direction. This is an inclined surface that faces both the front and the back when viewed from above.

The second connection portion 20B electrically connects the shunt resistor 2 to the second bus bar 320 by contacting the second bus bar 320. The second connecting portion 20B has a first contact surface 201B and a second contact surface 202B. The first contact surface 201B corresponds to the first contact surface 327b, is a front end region of the rear side surface of the shunt resistance main body section 21, and is a plane including the arrangement direction and the vertical direction. be. The second contact surface 202B corresponds to the second contact surface 328b and faces the first contact surface 201B in the width direction. The second contact surface 202B is formed to extend to both ends of the shunt resistance main body 21 in the vertical direction, and is a plane including the direction intersecting the arrangement direction and the vertical direction when viewed from the vertical direction, and is a plane including the vertical direction. This is an inclined surface that faces toward the rear and toward the back when viewed from above.

The detection conductors 22 are in contact with the shunt resistance main body part 21, and are a first detection conductor 22A and a second detection conductor 22B.

The first detection conductor 22A is arranged between the first connection part 20A and the second connection part 20B in the arrangement direction, and has a first contact part 23A and a first detection part 24A. The first contact portion 23A is arranged from end to end with respect to the shunt resistor main body 21 in a vertical direction that is a direction that intersects with the current flow direction in the shunt resistor main body 21, which is a direction perpendicular to the arrangement direction in this embodiment. contact the area. That is, the first contact portion 23A contacts the shunt resistance main body 21 with both ends of the shunt resistance main body 21 in the vertical direction, that is, with the entire area in the vertical direction. The first detection section 24A has a rod shape extending in the vertical direction, and is provided on one side of the shunt resistance main body section 21 in the width direction when viewed from the width direction. The first detection section 24A has a lower end that is the other end in the vertical direction connected to the first contact section 23A, and an upper end that is one end that is electrically connected to the current detection device 5. It is connected to the. That is, the first detection conductor 22A is formed in the shape of a single rod extending in the vertical direction.

The second detection conductor 22B is arranged between the first connection part 20A and the second connection part 20B in the arrangement direction, and is arranged apart from the first detection conductor 22A in the arrangement direction. The second detection conductor 22B has a second contact portion 23B and a second detection portion 24B. The second contact portion 23B is arranged from end to end with respect to the shunt resistance main body 21 in a vertical direction that is a direction that intersects the current flow direction in the shunt resistance main body 21, which is a direction perpendicular to the arrangement direction in this embodiment. contact the area. That is, the second contact portion 23B contacts both ends of the shunt resistance main body 21 in the vertical direction, that is, the entire area in the vertical direction. The second detection section 24B has a rod shape extending in the vertical direction, and is provided on one side of the shunt resistance main body section 21 in the width direction when viewed from the width direction. The second detection part 24B has a lower end, which is the other end in the vertical direction, connected to the second contact part 23B, and an upper end, which is one end, which is electrically connected to the current detection device 5. It is connected to the. That is, the second detection conductor 22B is formed in the shape of a single rod extending in the vertical direction. Here, the detection conductor 22 is made of a conductive metal such as Cu, and any material having a lower resistance value than the shunt resistor body 21 can be used as appropriate. The first contact part 23A and the second contact part 23B are brought into contact with the shunt resistor main body part 21 by welding, adhesive, etc., but any method can be used as long as the contact state can be maintained. good.

The shunt resistance type current detection device 1 in the first embodiment is assembled by attaching the shunt resistance 2 (the detection conductor 22 is connected to the shunt resistance main body 21 in advance) to the first bus bar 310 and the second bus bar 320. This is done by fixing. Specifically, the first connection part 20A and the second connection part 20B are inserted downward into the notch part 313a and the notch part 323b, respectively, and the shunt resistance main body part 21 is inserted into the first bus bar 310 and the second bus bar. Press fit into 320. At this time, the first contact surface 317a and the second contact surface 318a are in contact with the first contact surface 201A and the second contact surface 202A, respectively, and the first contact surface 327b and the second contact surface 328b are in contact with the first contact surface 201B and the second contact surface 202A, respectively. The two contact surfaces 202B are in contact with each other.

Next, a description will be given of how the current flows and the current detection method in the shunt resistance type current detection device 1 according to the first embodiment. Current flows from the power supply device 4 to the first bus bar 310, the shunt resistor 2, and the second bus bar 320 in this order. In detail, the current flows from the first busbar flat part 315a, the first busbar connection part 310a (the first contact surface 317a and the second contact surface 318a), the first connection part 20A (the first contact surface 201A and the second contact surface 202A), shunt resistance main body 21, second connection section 20B (first contact surface 201B and second contact surface 202B), second bus bar connection section 320b (first contact surface 327b and second contact surface 328b), This is followed by the second bus bar plane portion 325b. When a current passes through the shunt resistor 2, the current detection device 5 detects the potential difference between the first detection conductor 22A and the second detection conductor 22B that are in contact with the shunt resistor main body 21 as a current value.

FIG. 9 is a diagram showing the flow of current in a shunt resistor to be compared. FIG. 10 is a diagram showing the flow of current in the shunt resistor in the first embodiment. In addition, in FIG. 9, the contact between the first bus bar 310 and the second bus bar 320 and the shunt resistor main body part 21 is uniform, that is, the first contact surface 317a and the first contact surface 201A, and the second contact surface 318a and the second contact are uniform. It is a figure which shows the flow of the electric current in the shunt resistance main body part 21 when surface 202A, the 1st contact surface 327b and the 1st contact surface 201B, and the 2nd contact surface 328b and the 2nd contact surface 202B are in uniform contact. Note that FIGS. 9 and 10 are simulation results.

As shown in FIG. 9, if the contact between the first bus bar 310 and the second bus bar 320 and the shunt resistor main body part 21 is uniform, the flow of current in the shunt resistor main body part 21 in the arrangement direction becomes uniform, and The current flow distribution in a plane including the direction and the vertical direction is stabilized. However, it is extremely difficult to make uniform contact between the first bus bar 310 and the second bus bar 320 and the shunt resistor body 21, and the contact is usually non-uniform. Therefore, as shown in FIG. 10, the current flowing in the arrangement direction in the shunt resistor main body portion 21 becomes non-uniform, and the current flow distribution in a plane including the arrangement direction and the vertical direction becomes unstable. On the other hand, in the shunt resistance type current detection device 1 according to the present embodiment, the contact portions 23A and 23B of the detection conductors 22A and 22B are arranged in the shunt resistance body in the vertical direction perpendicular to the arrangement direction which is the current flow direction in the shunt resistance body 21. The contact portion 21 is in contact with the portion 21 at least from end to end. That is, in the portion of the shunt resistor main body 21 where the detection conductors 22A and 22B contact, that is, in the contact area extending to both ends in the vertical direction, the resistance changes compared to the shunt resistor main body 21 alone, Current flow is regulated. Therefore, as shown in the figure, the current flow in the shunt resistor main body 21 can be regulated by the detection conductors 22A and 22B, and even if the connection surfaces of the shunt resistor and the bus bar are unevenly connected, the detection conductor The current flow distribution in a plane including the arrangement direction and the vertical direction between 22A and 22B is stabilized. Thereby, the shunt resistance type current detection device 1 according to the present embodiment can detect a potential difference with little variation, and can improve current detection accuracy.

[Embodiment 2]
Next, the shunt resistance type current detection device 1 in Embodiment 2 will be explained. FIG. 11 is a perspective view showing a shunt resistance type current detection device in Embodiment 2. FIG. 12 is an exploded perspective view of the shunt resistance type current detection device according to the second embodiment. The shunt resistance type current detection device 1 according to the second embodiment has a feature that the first bus bar 310, the second bus bar 320, and the shunt resistor 2 are fixed by the spring member 70. Note that among the components of the shunt resistance type current detection device 1 in Embodiment 2, those that are the same as the components of the shunt resistance type current detection device 1 in Embodiment 1 are given the same reference numerals, and the description thereof will be omitted or simplified. become

The shunt resistance main body portion 21 has groove portions 25A and 25B formed therein. The groove portions 25A and 25B are formed to extend to both ends of the shunt resistance main body portion 21 in the width direction.

The first detection conductor 22A and the second detection conductor 22B have a first contact portion 23A and a second contact portion 23B extending in the width direction, and a first detection portion 24A and a second detection portion 24B extending in the vertical direction. has. The first contact portion 23A and the second contact portion 23B are inserted into the groove portions 25A and 25B, respectively. Here, the first detection conductor 22A and the second detection conductor 22B are not joined to the shunt resistance main body part 21.

The spring member 70 is in contact with the first bus bar 310, the second bus bar 320, and the shunt resistor 2, and is in contact with the first spring member 70A corresponding to the first detection conductor 22A and the second spring member 70A corresponding to the second detection conductor 22B. There are two spring members 70B. The first spring member 70A and the second spring member 70B are made of an elastically deformable material, for example, made of a conductive metal, and each has a pair of connecting parts 71, 72 and a connecting part 73. . In the first spring member 70A, the connecting portion 71 contacts the first contact portion 23A, and the connecting portion 72 contacts the first bus bar 310. The connecting portions 71 and 72 are connected by a connecting portion 73 at the front end, and are formed in a U-shape when viewed from the arrangement direction. In the second spring member 70B, the connecting portion 71 contacts the second contact portion 23B, and the connecting portion 72 contacts the second bus bar 320. The connecting portions 71 and 72 are connected by a connecting portion 73 at the front end, and are formed in a U-shape when viewed from the arrangement direction.

The shunt resistance type current detection device 1 in Embodiment 2 is assembled by inserting the first contact part 23A and the second contact part 23B into the grooves 25A and 25B of the shunt resistance main body part 21, and then inserting the first detection conductor 22A and the second contact part 23B. The second detection conductor 22B is temporarily fixed to the shunt resistor main body part 21. Next, the shunt resistor 2 is arranged between the first bus bar 310 and the second bus bar 320, the first connection part 20A is brought into contact with the first bus bar 310, and the second connection part 20B is brought into contact with the second bus bar 320. . Next, the first detection conductor 22A, the first connection portion 20A, and the first bus bar 310 are sandwiched by the first spring member 70A, and the shunt resistor 2 is fixed to the first bus bar 310 in an elastically deformed state. Next, the second detection conductor 22B, the second connection portion 20B, and the second bus bar 320 are sandwiched by the second spring member 70B, and the shunt resistor 2 is fixed to the second bus bar 320 in an elastically deformed state. Thereby, since the first detection conductor 22A and the second detection conductor 22B are brought into contact with the shunt resistance main body part 21 by the spring member 70, the first detection conductor 22A and the second detection conductor 22B and the shunt resistance main body part 21 are brought into contact with each other. It is possible to reduce the number of man-hours for joining, joining costs, etc.

[Embodiment 3]
Next, the shunt resistance type current detection device 1 in Embodiment 3 will be explained. FIG. 13 is a perspective view showing a shunt resistance type current detection device in Embodiment 3. FIG. 14 is an exploded perspective view of a shunt resistance type current detection device in Embodiment 3. The shunt resistance type current detection device 1 according to the third embodiment has a feature that the first bus bar 310, the second bus bar 320, and the shunt resistor 2 are fixed by the cover member 80. Note that, among the components of the shunt resistance type current detection device 1 in Embodiment 3, those that are the same as the components of the shunt resistance type current detection device 1 in Embodiment 2 are given the same reference numerals, and the description thereof will be omitted or simplified. become

The first bus bar 310 has a screw hole 319a formed at its rear end. The second bus bar 320 has a screw hole 329b formed at its rear end.

The first detection conductor 22A and the second detection conductor 22B are inserted into the grooves 25A and 25B, respectively, and the first detection conductor 22A and the second detection conductor 22B are joined to the shunt resistor main body part 21 in advance.

The cover member 80 contacts the first bus bar 310, the second bus bar 320, and the shunt resistor 2, and has a first cover member 80A corresponding to the first connection portion 20A and a second cover member 80A corresponding to the second connection portion 20B. The second cover member 80B. The first cover member 80A and the second cover member 80B are made of, for example, an insulating resin, and each has a through hole 81 into which the fixing member 90 is inserted. The second cover member 80B has a front end in contact with the second contact portion 20B, and a rear end in contact with the second bus bar 320. The first cover 80A has its rear end in contact with the first contact portion 20A, and its front end in contact with the first bus bar 310.

The fixing member 90 fixes the shunt resistor 2 to the first bus bar 310 and the second bus bar 320, and includes a first fixing member 90A corresponding to the first cover member 80A and a second fixing member corresponding to the second cover member 80B. The second fixing member 90B.

The shunt resistance type current detection device 1 in the third embodiment is assembled by arranging the shunt resistance 2 between the first bus bar 310 and the second bus bar 320, and bringing the first connection portion 20A into contact with the first bus bar 310. , brings the second connecting portion 20B into contact with the second bus bar 320. Next, the first cover member 80A is brought into contact with the first connection portion 20A and the first bus bar 310, the fixing member 90A is inserted into the through hole 81 of the first cover member 80A, and the fixing member 90A is screwed into the screw hole 319a. By doing so, the shunt resistor 2 is fixed to the first bus bar 310. Next, the second cover member 80B is brought into contact with the second connection portion 20B and the second bus bar 320, the fixing member 90B is inserted into the through hole 81 of the second cover member 80B, and the fixing member 90B is screwed into the screw hole 329b. By doing so, the shunt resistor 2 is fixed to the second bus bar 320.
As a result, since the first detection conductor 22A and the second detection conductor 22B are brought into contact with the shunt resistance main body part 21 by the spring member 70, the first detection conductor 22A and the second detection conductor 22B and the shunt resistance main body part 21 are brought into contact with each other. It is possible to reduce the number of man-hours for joining, joining costs, etc.

1 Shunt resistance type current detection device 2 Shunt resistance 22 Detection conductor 22A First detection conductor 22B Second detection conductor 23A First contact part 23B Second contact part 24A First detection part 24B First detection part 310 First bus bar 320 Second Bus bar 4 Power supply device 5 Current detection device

Claims (3)

In a shunt resistance type current detection device including a flat shunt resistor electrically connected to a flat first bus bar and a flat second bus bar,
The shunt resistor includes a shunt resistor main body connected to the first bus bar and the second bus bar, and a plurality of detection conductors in contact with the shunt resistor main body,
The shunt resistance main body has a first connection part and a second connection part,
the first connection portion contacts a first bus bar;
the second connection portion contacts a second bus bar;
The detection conductor has a detection part and a contact part,
The detection section is electrically connected to a current detection device and connected to the contact section,
The contact portion contacts the shunt resistor main body from at least end to end in a direction intersecting the current flow direction in the shunt resistor main body.
A shunt resistance type current detection device characterized by: The detection conductor is a first detection conductor and a second detection conductor,
Each of the detection parts of the first detection conductor and the second detection conductor is provided on one side in the width direction of the shunt resistor,
The shunt resistance type current detection device according to claim 1. The contact portion contacts the shunt resistor main body at least from end to end in a direction perpendicular to the direction of current flow in the shunt resistor main body.
The shunt resistance type current detection device according to claim 1 or 2.