JP2023031441A - Fixing structure of terminal - Google Patents

Abstract

An object of the present invention is to prevent a large force from being applied to a bonding portion between a substrate and a busbar portion of a terminal with a busbar and to the substrate even if a load is applied to the terminal portion.
A housing (3) comprising a housing body (11) and a cover (13), a substrate (5) installed in the housing (3), a bus bar (17), and a terminal (19). The busbar portion 17 is joined to the substrate 5, so that the terminal portion 19 is installed on the substrate 5 and protrudes from the housing 3, and the terminal portion 19 of the terminal 7 with the busbar. In order to reduce the value of the stress generated in the joint portion 21 between the busbar portion 17 and the substrate 5 due to the applied force, the stress provided in the housing 3 by engaging the terminal 7 with the busbar and the housing 3 1 is a fixing structure 1 for a terminal having a reducing member 9. FIG.
[Selection drawing] Fig. 1

Description

The present invention relates to a terminal fixing structure.

2. Description of the Related Art Conventionally, a terminal fixing structure including a housing, a substrate, and terminals with bus bars is known. A conventional busbar-equipped terminal having a terminal fixing structure includes a busbar portion and a terminal portion installed on the busbar portion.

A part of the busbar portion is soldered to the substrate, so that the terminal with the busbar is installed on the substrate. In addition, the part above the terminal part of the terminal with a bus bar is a male screw part.

JP 2011-505115 A

In recent years, as the voltage of circuits has become higher due to changes in automobiles, the size of the input/output terminals (terminals) used has increased, and a structure that can handle a large load on the component parts has become necessary. As described above, in the conventional terminal fixing structure, the busbar portion of the busbar-equipped terminal is directly provided on the substrate by soldering.

Therefore, when the connection LA terminal on the harness side is installed on the male screw portion of the terminal portion using a nut, the load applied to the terminal portion (in particular, the moment around the terminal portion) is directly applied to the substrate. .

As a result, a large force is applied to the substrate and the bonding portion (bonding portion using solder) between the substrate and the busbar portion of the terminal with busbar, which may cause problems such as cracks in the bonding portion and the substrate. There is

The present invention provides a terminal fixing structure comprising a housing, a substrate, and terminals with busbars, in which even if a load is applied to the terminal portion, a large force is exerted on the substrate and at the junction between the substrate and the busbar portion of the terminal with busbars. The purpose is to prevent joining.

A terminal fixing structure according to an aspect of the present invention includes: a housing including a housing main body and a cover installed in the housing main body; and a substrate installed in the housing. and a busbar portion and a terminal portion installed on the busbar portion, and the busbar portion is installed on the substrate by joining the busbar portion to the substrate, and at least the terminal portion In order to reduce the value of the stress generated in the joint portion between the busbar portion and the board due to the force applied to the terminal portion with the busbar portion protruding from the housing and the terminal portion of the terminal portion with the busbar portion, the The terminal fixing structure includes a terminal with a busbar and a stress reducing member engaged with and provided within the housing.

1 is a perspective view showing a terminal fixing structure according to a first embodiment of the present invention; FIG. 1 is a perspective view showing a terminal fixing structure according to a first embodiment of the present invention, showing a state in which a cover portion is removed; FIG. It is a figure which shows the III-III cross section in FIG. FIG. 2 is a perspective view of a cover portion of the terminal fixing structure according to the first embodiment of the present invention; 1 is a perspective view of a stress reducing member of a terminal fixing structure according to a first embodiment of the present invention; FIG. 1 is a perspective view of a stress reducing member of a terminal fixing structure according to a first embodiment of the present invention; FIG. 1 is a perspective view of a terminal with a busbar of a terminal fixing structure according to a first embodiment of the present invention; FIG. 1 is a perspective view of a terminal with a busbar of a terminal fixing structure according to a first embodiment of the present invention; FIG. FIG. 2 is a perspective view of a housing body of the terminal fixing structure according to the first embodiment of the present invention; FIG. 8 is a perspective view of a cover portion of a terminal fixing structure according to a second embodiment of the present invention; FIG. 5 is a perspective view of a stress reducing member of a terminal fixing structure according to a second embodiment of the present invention; FIG. 5 is a perspective view of a stress reducing member of a terminal fixing structure according to a second embodiment of the present invention; FIG. 8 is a perspective view showing a terminal fixing structure according to a second embodiment of the present invention, showing a state in which a cover portion is removed; FIG. 10 is a perspective view of a housing body of a terminal fixing structure according to a second embodiment of the present invention; FIG. 7 is a cross-sectional perspective view of part of a terminal fixing structure according to a second embodiment of the present invention; FIG. 6 is a perspective view showing a terminal fixing structure according to a comparative example;

[First embodiment]
A terminal fixing structure 1 according to a first embodiment of the present invention is employed, for example, in an electric circuit of a battery pack of an automobile (for example, a battery ECU for controlling a battery).

Here, for convenience of explanation, one predetermined direction is the vertical direction, one predetermined direction orthogonal to the vertical direction is the horizontal direction, and the direction orthogonal to the vertical direction and the horizontal direction is the height direction ( thickness direction).

As shown in FIGS. 1 to 3, the terminal fixing structure 1 includes a housing 3, a substrate (for example, a rigid printed circuit board) 5, terminals with busbars (stud bolts with busbars) 7, and stress reduction members (stress relaxation members). 9.

The housing 3 includes a housing main body 11 and a cover (lid) 13 which is integrally installed on the housing main body 11 in contact with the housing main body 11 . The housing main body portion 11 is made of metal, for example, in order to increase strength and heat dissipation, and the cover portion 13 is also made of metal, for example, in order to increase strength and heat dissipation. The substrate 5 is installed inside the housing 3 .

The substrate 5 includes a substrate main body 15, wiring circuits (not shown), and electronic components (not shown). The substrate main body 15 is made of an insulating material and formed into a flat plate. The wiring circuit and electronic components are provided on the substrate body portion 15 .

The busbar-equipped terminal 7 includes a busbar portion 17 and a terminal portion (stud bolt portion) 19 provided integrally with the busbar portion 17 . A part of the busbar portion 17 is joined to the substrate 5 (a land portion which is a part of the wiring circuit of the substrate 5) by soldering, for example, so that the terminal 7 with the busbar is installed on the substrate 5. FIG. At least a portion of the terminal portion 19 protrudes upward in the height direction from the housing 3 .

The stress reducing member 9 is provided to reduce the value of the stress generated at the joint portion 21 between the busbar portion 17 and the substrate 5 due to the force (including moment) applied to the terminal portion 19 of the busbar-equipped terminal 7 . . The stress reducing member 9 is provided inside the housing 3 in engagement with the terminals 7 with busbars and the housing 3 (at least one of the housing main body portion 11 and the cover portion 13).

Moreover, the stress reducing member 9 is made of an insulator (for example, a synthetic material having insulating properties) in order to ensure insulation between the housing 3 and the terminals 7 with busbars and current-carrying parts (wiring circuits, etc.) of the substrate 5 . resin).

That is, in the terminal fixing structure 1 , the substrate main body portion 15 of the substrate 5 is in contact with the housing main body portion 11 , and the stress reducing member 9 is in contact with the cover portion 13 . On the other hand, in the terminal fixing structure 1 , the terminals 7 with busbars, the wiring circuit of the substrate 5 , and the conducting parts such as the electronic components are separated from the housing main body 11 and the cover part 13 . As a result, the insulation between the housing 3 and the terminals 7 with busbars, the wiring circuit of the substrate 5, the current-carrying parts such as the electronic components, and the like is ensured.

In the terminal fixing structure 1 , when viewed in the extending direction (height direction) of the central axis of the terminal portion 19 , the joint portion 21 between the busbar portion 17 and the substrate 5 is arranged near the central axis of the terminal portion 19 . there is That is, the value of the distance between the central axis of the terminal portion 19 and the joint portion 21 farthest from the central axis of the terminal portion 19 when viewed in the extension direction of the central axis of the terminal portion 19 is the terminal portion It is smaller than the value of the dimension of the terminal portion 19 in the extending direction of the central axis of the terminal portion 19 .

In addition, when viewed in the extending direction of the central axis of the terminal portion 19 , the joint portions 21 between the busbar portion 17 and the substrate 5 are arranged on both sides of the terminal portion 19 in the vertical direction, and the busbar portion 17 and the substrate 5 are arranged on both sides of the terminal portion 19 even in the lateral direction.

Further, when viewed in the extending direction of the central axis of the terminal portion 19, the joint portion 21 between the busbar portion 17 and the substrate 5 is symmetrical with respect to a straight line including the central axis of the terminal portion 19 and extending in the lateral direction. Moreover, it is symmetrical with respect to a straight line that includes the central axis of the terminal portion 19 and extends in the vertical direction.

The stress reducing member 9 is provided with a first engaged portion 23 engaged with the cover portion 13 and a second engaged portion 25 engaged with the terminal 7 with busbar. As shown in FIG. 4, the cover portion 13 is provided with a first engaging portion 27 into which the first engaged portion 23 of the stress reducing member 9 is fitted and integrally engaged. there is As shown in FIGS. 7 and 8, the busbar-equipped terminal 7 is provided with a second engaging portion 29 that is integrally engaged with the second engaged portion 25 of the stress reducing member 9 . .

In the terminal fixing structure 1, the first engaged portion 23 is engaged with the first engaging portion 27, and the second engaged portion 25 is engaged with the second engaging portion 29. ing. Due to these engagements, when the moment about the central axis of the terminal portion 19 among the forces is applied to the terminal portion 19, most of the moment is transferred between the cover portions 13 via the stress reducing member 9. The signal is transmitted to the housing main body 11 via. Further, it is configured to reduce the value of the stress generated at the joint portion 21 between the busbar portion 17 and the substrate 5 . Note that the moment (torque) about the center axis of the terminal portion 19 is indicated by an arrow A1 in FIGS.

Here, the force applied to the terminal portion 19 will be further described.

The first force is the moment about the center axis of the terminal portion 19 (the moment about the axis extending in the height direction (see arrow A1 in FIGS. 2 and 3). The second force is There is a moment about the longitudinally extending axis (see arrow A2 in FIGS. 2 and 3), and a third force is the moment about the laterally extending axis (see arrow A3 in FIGS. 2 and 3). The fourth force is the force in the height direction (see arrow A4 in Figures 2 and 3), and the fifth force is the force in the vertical direction (see arrow A5 in Figure 3). A sixth force is a lateral force (see arrow A6 in FIGS. 2 and 3).

In the terminal fixing structure 1, the first engaged portion 23 of the stress reducing member 9 is engaged with the first engaging portion 27 of the cover portion 13, and the second engaged portion 25 of the stress reducing member 9 is engaged. It is engaged with the second engaging portion 29 of the terminal 7 with busbar. As a result, it is possible to reduce the value of the stress generated in the joint portion 21 when at least the first force is applied.

Further, in the terminal fixing structure 1, as shown in FIG. They are arranged in this order from the upper side to the lower side in the direction (thickness direction). As a result, the stress reducing member 9 is positioned on the cover portion 13 side, and the busbar portion 17 is positioned on the housing main body portion 11 side.

The stress reducing member 9, the busbar portion 17, and the substrate 5 are sandwiched between the housing main body portion 11 and the cover portion 13 with, for example, an appropriate biasing force in the height direction.

Due to this sandwiching, when at least a moment of the force about an axis (an axis extending in the vertical direction and the horizontal direction) orthogonal to the central axis of the terminal portion 19 is applied to the terminal portion 19, The value of the stress generated in the joint portion 21 is reduced. Moments about axes extending in the vertical and horizontal directions are the second force and the third force (see arrows A2 and A3 in FIGS. 2 and 3).

That is, most of the moment about the axis extending in the vertical and horizontal directions is transmitted to the housing body 11 and the cover 13 via the stress reducing member 9, and the joint portion 21 between the busbar 17 and the substrate 5 is configured to reduce the value of the stress generated in the

Also, due to the sandwiching, for example, when the fourth to sixth forces (see arrows A4, A5, and A6 in FIGS. 2 and 3) are applied to the terminal portion 19, It is possible to reduce the value of stress generated in the joint portion 21 .

As described above, the stress reducing member 9 is made of an insulating synthetic resin, and the stress reducing member 9 is integrated with the terminal portion 19 of the terminal 7 with a busbar by, for example, insert molding. there is

Since the stress reduction member 9 is sandwiched and provided integrally with the terminal portion 19, the force in the direction from the upper side to the lower side in the height direction of the fourth force is applied to the terminal portion 19. In some cases, it is possible to reduce the value of the stress generated in the joint site 21 . That is, it is assumed that a force in the direction from the upper side to the lower side is applied to the terminal portion 19 . Since this force is transmitted to the housing main body 11 via the stress reducing member 9 and the busbar portion 17, the stress generated in the joint portion 21 is reduced as compared with the case where the stress reducing member 9 is not employed. It has become so.

Further, in the terminal fixing structure 1, a plurality of (for example, three) terminals 7 with busbars are provided. One stress reducing member 9 is integrated with a plurality of terminals 7 with busbars. In addition, a plurality of terminals 7 with busbars (terminal portions 19 and busbar portions 17) are insulated from each other by one stress reducing member 9 except for connection via the substrate 5. FIG.

The plurality of terminals 7 with busbars are arranged in one predetermined direction (horizontal direction) at predetermined intervals. The longitudinal direction of the stress reducing member 9 is transverse. The first engaged portions 23 of the stress reducing member 9 are arranged at a plurality of locations.

As shown in FIG. 5 , a first engaged portion 23</b>A, which is a part of the plurality of first engaged portions 23 , is one end (the first end) in the longitudinal direction (horizontal direction) of the stress reducing member 9 . 1 end). Some first engaged portions 23</b>A among the plurality of first engaged portions 23 are positioned outside the plurality of busbar terminals 7 in the longitudinal direction of the stress reducing member 9 . .

Another first engaged portion 23</b>A of the plurality of first engaged portions 23 is the other end (second end) of the stress reducing member 9 in the longitudinal direction (horizontal direction). is provided in Other first engaged portions 23</b>A of the plurality of first engaged portions 23 are positioned outside the plurality of busbar terminals 7 in the longitudinal direction of the stress reducing member 9 . ing.

The remaining first engaged portions 23B among the plurality of first engaged portions 23 are provided in the longitudinal (horizontal) intermediate portion of the stress reducing member 9 .

Here, the terminal fixing structure 1 will be described in more detail.

As shown in FIG. 9, the housing main body 11 is formed in a rectangular flat plate shape. The housing main body 11 is a water jacket, and has a flow path (not shown) for cooling water therein. A rectangular concave portion 31 is formed in the upper surface of the housing main body portion 11 .

By forming the concave portion 31 , a rectangular flat surface 33 for setting the substrate 5 is formed in the center of the upper surface of the housing main body portion 11 . Further, by forming the concave portion 31 , a rectangular ring-shaped flat surface 35 is provided on the upper surface of the housing main body 11 so as to surround the flat surface 33 . Furthermore, a rectangular annular side wall portion 37 protrudes upward so as to surround the plane 35 .

The planar upper surfaces of the planes 33, 35, and side wall portions 37 are perpendicular to the height direction. In addition, the plane 35 is located slightly above the plane 33 in the height direction, and the planar upper surface of the side wall portion 37 is located slightly above the plane 35 .

As shown in FIG. 4, the cover portion 13 is formed in a shallow rectangular box shape having a bottom wall portion 39 and side wall portions 41 . A plurality of circular through holes 43 are provided in the bottom wall portion 39 . The through hole 43 is positioned on one end (first end) in the vertical direction. Also, the plurality of through holes 43 are arranged in the horizontal direction at regular intervals. Each of the plurality of terminal portions 19 passes through each of the plurality of through holes 43 in a non-contact manner with the cover portion 13 .

When the cover portion 13 is installed on the housing body portion 11 , the tip surface (lower end surface) of the side wall portion 41 is in contact with the flat surface 35 of the housing body portion 11 . A rectangular parallelepiped internal space 45 is formed inside the housing 3 .

A first engaging portion 27 of the cover portion 13 is formed at a portion of the bottom wall portion 39 near the plurality of through holes 43 . The first engaging portions 27A, which are part of the first engaging portions 27, are arranged at both ends in the horizontal direction and positioned outside the plurality of through holes 43 in the horizontal direction. The remaining first engaging portion 27B of the first engaging portion 27 is arranged in the middle portion in the lateral direction.

A short cylindrical wall portion 47 rises slightly downward in the height direction from the outer periphery of each through hole 43 . A first engaging portion 27Aa, which is a part of the first engaging portion 27A, is a pair of wall portions (small rectangular plate-like wall portions) 49 and a small rectangular parallelepiped between the pair of wall portions 49. It is formed with a space 51 having a shape. The wall portion 49 is formed in a rectangular small flat plate shape. The thickness direction of the wall portion 49 is the vertical direction. The pair of walls 49 are parallel and close to each other.

A pair of wall portions 49 (space 51 ) are in contact with the wall portions 47 on both outer sides of the plurality of cylindrical wall portions 47 in the lateral direction and slightly protrude from the outer periphery of the wall portions 47 . In the vertical direction, the center position of the cylindrical wall portion 47 and the center position of the space 51 coincide with each other.

The remaining first engaging portion 27Ab and first engaging portion 27B of the first engaging portion 27A are formed of a cylindrical wall portion 53 having a small diameter. The cylindrical wall portion 53 is in contact with the cylindrical wall portion 47 .

The projection heights of the cylindrical wall portion 47, the small rectangular plate-shaped wall portion 49, and the small cylindrical wall portion 53 from the bottom wall portion 39 are the same, and the projection height of the side wall portion 41 is the same. It is extremely small compared to its height. That is, the lower surface of the cylindrical wall portion 47 (tip surface in the projecting direction), the lower surface of the small rectangular plate-like wall portion 49 (tip surface in the projecting direction), the small cylindrical wall portion The lower surface of 53 (tip surface in the projecting direction) is located on one plane perpendicular to the height direction.

As shown in FIG. 2, the substrate 5 (substrate body portion 15) is formed in a rectangular thin plate shape. It is installed in the recess 31 (internal space 45) of the housing main body 11 so that one surface in the thickness direction (lower plane) is in contact with the flat surface 33 of the housing main body 11. .

As shown in FIGS. 7 and 8, the busbar-equipped terminal 7 includes a metal busbar portion 17 and a metal terminal portion 19 . The terminal portion 19 includes a distal portion 55 , an intermediate portion 57 , a proximal portion 59 and an insertion portion 61 .

The distal end portion 55, the intermediate portion 57, the proximal end portion 59, and the insertion portion 61 are arranged in this order from top to bottom in the height direction. The distal end portion 55 is male-threaded, the intermediate portion 57 is formed in a cylindrical shape, the base end portion 59 is formed in a square prism shape, and the insertion portion 61 is also formed in a square prism shape.

The value of the outer diameter dimension of the intermediate portion 57 is greater than the value of the outer diameter dimension of the distal end portion 55 , and the value of the outer diameter dimension of the base end portion 59 is greater than the value of the outer diameter dimension of the intermediate portion 57 . The value of the outer diameter dimension of the insertion portion 61 is smaller than the value of the outer diameter dimension of the base end portion 59 .

The central axis of the distal end portion 55, the central axis of the intermediate portion 57, the central axis of the proximal end portion 59, and the central axis of the insertion portion 61 are aligned with each other. These central axes extend in the height direction.

The busbar portion 17 is formed by bending a flat plate material having a predetermined shape (for example, a rectangular shape) at predetermined locations (for example, two locations). More specifically, the busbar portion 17 includes a busbar body portion 63 , a first busbar standing portion 65 , a second busbar standing portion 67 , and a board insertion portion 69 .

The busbar body portion 63 is formed in a rectangular flat plate shape. The first busbar upright portion 65 and the second busbar upright portion 67 are also formed in a rectangular flat plate shape. The thickness direction of the busbar body portion 63 is the height direction.

The first busbar standing portion 65 stands up by a predetermined height downward in the height direction from the end of the busbar main body portion 63 (the first end, which is one end in the vertical direction). The second busbar standing portion 67 stands up by a predetermined height downward in the height direction from the end of the busbar main body portion 63 (the second end, which is the other end in the vertical direction). The thickness direction of the first busbar standing portion 65 and the thickness direction of the second busbar standing portion 67 are vertical.

A rectangular through hole 71 is formed in the center of the busbar body portion 63 . The insertion portion 61 of the terminal portion 19 is press-fitted into the through hole 71 of the busbar main body portion 63, so that the busbar portion 17 and the terminal portion 19 are integrated. In the terminal 7 with a busbar, the distal end portion 55 , intermediate portion 57 , and base end portion 59 of the terminal portion 19 protrude upward in the height direction from the center of the busbar body portion 63 . In the terminal 7 with a busbar, the base end portion 59 is in contact with the busbar body portion 63 .

The substrate insertion portion 69 forms the joint portion 21 between the substrate 5 and the busbar-equipped terminal 7 , and is formed of a plurality of protrusions. It protrudes slightly from the tip (lower end in the height direction). Also, the plurality of protrusions 69 forming the board insertion portion 69 are arranged in a row at predetermined intervals in the horizontal direction.

The busbar-equipped terminal 7 is symmetrical with respect to a plane including the central axis of the terminal portion 19 and perpendicular to the longitudinal direction. Moreover, the busbar-equipped terminal 7 is symmetrical with respect to a plane including the central axis of the terminal portion 19 and perpendicular to the horizontal direction. The second engaging portion 29 of the terminal 7 with busbar is formed by the base end portion 59 of the terminal portion 19 and the upper surface of the busbar body portion 63 of the busbar portion 17 .

As shown in FIGS. 5 and 6, the stress reducing member 9 includes a member main body portion 73, a short columnar protrusion (disc-like protrusion) 77, a short rib portion 79, and a short small circle. It is configured with a columnar projecting portion 81 . The member body portion 73 is formed in an elongated rectangular flat plate shape. A through hole 75 provided in the member main body portion 73 is formed in a rectangular shape and penetrates the member main body portion 73 in the thickness direction (height direction). A plurality of through-holes 75 are provided, arranged in the center of the member main body 73 in the vertical direction, and arranged at predetermined intervals in the horizontal direction.

The disk-shaped protruding portion 77 protrudes slightly from one surface (upper surface) in the thickness direction of the member main body portion 73 . The disk-shaped projections 77 are provided in the same number as the through holes 75 . A disk-shaped protrusion 77 is provided so that each of the plurality of through-holes 75 is surrounded by a plurality of disk-shaped protrusions 77 when viewed in the height direction. The central axis of the through-hole 75 and the central axis of the disc-shaped protruding portion 77 are aligned with each other. The through-hole 75 also penetrates the disk-shaped projecting portion 77 .

The rib portion 79 is composed of a small rectangular parallelepiped projection, and is positioned in the center of the member main body portion 73 in the vertical direction, and is located on the outer side of the disk-shaped projection portion 77 in the vertical direction of the member main body portion 73 . provided at both ends. The rib portion 79 slightly protrudes upward in the height direction from the member body portion 73 .

The cylindrical protruding portions 81 are positioned at both ends of the member main body portion 73 in the vertical direction, and are arranged at predetermined intervals in the horizontal direction.

The tip surface (upper end surface) of the disk-shaped protrusion 77, the tip surface (upper end surface) of the rib portion 79, and the tip surface (upper end surface) of the small columnar protrusion 81 are orthogonal to the height direction. It is located on one predetermined plane where

The through hole 75 of the stress reducing member 9 is in contact with the base end portion 59 of the terminal portion 19 of the terminal 7 with busbar. A portion of the lower plane of the member main body portion 73 of the stress reducing member 9 is in contact with the upper surface of the busbar main body portion 63 of the busbar portion 17 . The through hole 75 of the stress reducing member 9 and one surface of the busbar body portion 63 in the thickness direction form the second engaged portion 25 of the stress reducing member 9 .

The rib portion 79 of the stress reducing member 9 and the small cylindrical protrusion 81 constitute the first engaged portion 23 of the stress reducing member 9 . That is, in the terminal fixing structure 1 , the rib portion 79 is fitted into the rectangular parallelepiped space 51 between the pair of wall portions 49 of the cover portion 13 , and the columnar projecting portion 81 is formed in the cylindrical shape of the cover portion 13 . It fits into the wall portion 53 .

Further, in the terminal fixing structure 1, as shown in FIG. 3, in the height direction, from the lower side to the upper side, the housing main body 11, the substrate 5, the bus bar portion 17 of the terminal 7 with bus bar, and the stress reducing member are arranged. 9 and cover portion 13 are arranged in this order. Further, in the terminal fixing structure 1, as described above, the substrate 5, the busbar portion 17, and the stress reducing member 9 are sandwiched between the housing main body portion 11 and the cover portion 13 with an urging force in the height direction. there is

A tall cylindrical portion 83 is provided in the cover portion 13 . The tall cylindrical portion 83 protrudes upward from one surface (upper surface) in the thickness direction of the bottom wall portion 39 of the cover portion 13 . A plurality of tall cylindrical portions 83 are provided, and each of the plurality of tall cylindrical portions 83 surrounds each of the plurality of terminals 7 with busbars. By providing the cylindrical portion 83 , the through hole 43 provided in the bottom wall portion 39 is extended upward from the bottom wall portion 39 .

Here, the procedure for assembling the terminal fixing structure 1 will be described. Note that the busbar-equipped terminal 7 and the stress reducing member 9 are integrated in advance.

First, terminals 7 with busbars are installed on substrate 5 by soldering, for example. Subsequently, the substrate 5 , the terminals 7 with busbars, and the stress reducing member 9 are installed on the housing main body 11 . Subsequently, the cover portion 13 is installed on the housing main body portion 11 .

In the terminal fixing structure 1, the stress reduction member 9 prevents the force applied to the terminal portion 19 of the terminal 7 with the busbar from being transmitted directly to the substrate 5 or the like, and is transmitted to the housing 3. . Further, the value of the stress generated in the bonding portion 21 between the busbar portion 17 and the substrate 5 and the substrate 5 is reduced (the strain is reduced).

As a result, even if a load is applied to the terminal portion 19 , a large force is prevented from being applied to the substrate 5 and the bonding portion 21 between the substrate 5 and the busbar portion 17 of the terminal 7 with the busbar. Further, problems such as cracks occurring in the bonding portion 21 and the substrate 5 are prevented from occurring.

As shown in FIG. 16, the terminal fixing structure 301 according to the comparative example includes a housing body 303, a substrate 305, and terminals 307 with busbars. The terminal 307 with a busbar is composed of a busbar portion 309 and a terminal portion 311 installed on the busbar portion 309 .

A part of the busbar portion 309 is soldered to the substrate 305 so that the terminal 307 with the busbar is installed on the substrate 305 .

In the terminal fixing structure 301, the stress reducing member 9 does not exist, and the busbar portion 309 of the busbar-equipped terminal 307 is directly provided on the substrate 305 by soldering. Therefore, when the connection LA terminal on the harness side is installed on the male screw portion of the terminal portion 311 using a nut, the load applied to the terminal portion 311 (especially the moment around the terminal portion 311) is applied to the substrate 305. It takes directly.

Further, in the terminal fixing structure 1 , the first engaged portion 23 is engaged with the first engaging portion 27 and the second engaged portion 25 is engaged with the second engaging portion 29 . ing.

Due to the engagement, when a moment about the central axis of the terminal portion 19 is applied to the terminal portion 19, most of the moment is transmitted to the cover portion 13 (housing 3) via the stress reducing member 9. It has become. Further, the value of the stress generated at the joint portion 21 between the busbar portion 17 and the substrate 5 is reduced.

This configuration eliminates the need to provide the second engaging portion 29 between the housing main body portion 11 and the substrate 5 . Further, it is possible to simplify the configuration of the housing main body 11 and the substrate 5, and furthermore, it is not necessary to provide a hole or the like constituting the second engaging portion 29 in the substrate 5, thereby reducing the mounting space for electronic components. can be secured.

Further, in the terminal fixing structure 1 , the stress reducing member 9 , the busbar portion 17 , and the substrate 5 are aligned in the height direction of the housing 3 between the housing main body portion 11 and the cover portion 13 . Moreover, the stress reducing member 9, the busbar portion 17, and the substrate 5 are sandwiched between the housing main body portion 11 and the cover portion 13 with an urging force.

Furthermore, in the terminal fixing structure 1, when a moment about an axis orthogonal to the central axis of the terminal portion 19 is applied to the terminal portion 19 due to the sandwiching, most of this moment is converted into stress. The power is transmitted to the cover portion 13 via the reducing member 9 . Further, the value of the stress generated at the joint portion 21 between the busbar portion 17 and the substrate 5 is reduced.

With this configuration, it is assumed that a moment about the axis extending in the vertical direction and about the axis extending in the horizontal direction are applied to the terminal portion 19 . Even when the above moment is applied, a large force is prevented from being applied to the substrate 5 and the bonding portion 21 between the substrate 5 and the busbar portion 17 of the terminal 7 with a busbar.

Further, in the terminal fixing structure 1 , the stress reducing member 9 is integrated with the terminal portion 19 of the terminal 7 with a busbar. As a result, the number of component parts in the terminal fixing structure 1 is reduced, and further, rattling between the stress reducing member 9 and the terminal 7 with the busbar can be reliably prevented.

Further, in the terminal fixing structure 1 , a plurality of terminals 7 with busbars are provided, and one stress reducing member 9 is integrated with the plurality of terminals 7 with busbars. This facilitates assembly of the terminal fixing structure 1 .

In addition, in the terminal fixing structure 1 , the first engaged portion 23</b>A, which is a part of the plurality of first engaged portions 23 , is located at one longitudinal end (first end) of the stress reducing member 9 . end). Some first engaged portions 23</b>A among the plurality of first engaged portions 23 are positioned outside the plurality of busbar terminals 7 in the longitudinal direction of the stress reducing member 9 . .

Further, in the terminal fixing structure 1 , the first engaged portion 23</b>A, which is another part of the plurality of first engaged portions 23 , is the other longitudinal end of the stress reducing member 9 (the second end). 2). Further, the first engaged portion 23A, which is the other part of the plurality of first engaged portions 23, is positioned outside the plurality of terminals 7 with busbars in the longitudinal direction of the stress reducing member 9. ing.

With this configuration, when the first force is applied to the terminal portion 19 , the first force can be received by the housing 3 more reliably.

The terminal fixing structure 1 is adapted for use in an electric circuit of an automobile battery pack. As a result, it is possible to efficiently dissipate heat generated by a large current or the like with a metal housing.

[Second embodiment]
A terminal fixing structure 1a according to a second embodiment of the present invention will be described with reference to FIGS. 10 to 15. FIG.

The terminal fixing structure 1a according to the second embodiment of the present invention is different from the terminal fixing structure according to the first embodiment in that most of the force applied to the terminal portion 19 is transmitted to the housing main body portion 11 . Unlike the structure 1, other points are configured in the same manner as the terminal fixing structure 1. FIG.

That is, in the terminal fixing structure 1a, the stress reducing member 9 is provided with the first engaged portion 23 and the second engaged portion 25 (see FIGS. 11 and 12). A first engaging portion 27 with which the first engaged portion 23 is engaged is provided on the housing main body portion 11 . The busbar-equipped terminal 7 is provided with a second engaging portion 29 that engages with the second engaged portion 25 (see FIG. 14).

In the terminal fixing structure 1a according to the second embodiment, the shapes of the first engaged portion 23 and the first engaging portion 27 are different from those of the terminal fixing structure 1 according to the first embodiment. there is The configurations of the second engaged portion 25 and the second engaging portion 29 are similar to those of the terminal fixing structure 1 according to the first embodiment.

In the terminal fixing structure 1a according to the second embodiment, the first engaged portion 23 is engaged with the first engaging portion 27, and the second engaged portion 25 is the second engaging portion. 29. As a result, when a moment (torque) about the central axis of the terminal portion 19 is applied to the terminal portion 19 , most of the moment about the central axis of the terminal portion 19 is transferred to the housing main body portion 11 via the stress reducing member 9 . (Case 3). Further, it is configured to reduce the value of the stress generated at the joint portion 21 between the busbar portion 17 and the substrate 5 .

The terminal fixing structure 1a will be described in more detail. The first engaged portion 23 of the stress reducing member 9 is formed of a small cylindrical projection 85 as shown in FIG. The protrusion 85 protrudes by a predetermined height from the lower surface of the member body portion 73 of the stress reduction member 9 in the height direction. In addition, a plurality of projections 85 are provided, which are positioned in the center of the member main body 73 in the vertical direction and arranged at regular intervals in the horizontal direction. Note that the projection 85 does not necessarily have to be positioned in the center of the member main body 73 in the vertical direction, and may be provided at an end or the like.

The first engaging portion 27 of the housing main body 11 is formed of a plurality of cylindrical holes (blind holes) 87 provided in the housing main body 11 so as to match the projections 85 . Then, as shown in FIG. 14 , the first engaged portion 23 is engaged with the first engaging portion 27 by fitting each of the projections 85 into each of the plurality of holes 87 . (See FIG. 15).

As shown in FIGS. 13 to 15, the substrate 5 is also provided with a plurality of through holes 89, and the protrusions 85 penetrate through the through holes 89. As shown in FIG. 14 is a recess for avoiding contact between the substrate insertion portion 69 of the busbar-equipped terminal 7 and the housing main body 11 as well. The portion of the substrate insertion portion 69 that protrudes downward from the substrate 5 and the solder enter the concave portion 91 in a non-contact state with the housing body portion 11 . In addition, in FIG. 9, the display of the recessed part 91 is abbreviate|omitted.

In addition, in the terminal fixing structure 1a, as shown in FIG.

In the terminal fixing structure 1a, the first engaged portion 23 is engaged with the first engaging portion 27, and the second engaged portion 25 is engaged with the second engaging portion 29. is configured as Due to the engagement, when a moment about the central axis of the terminal portion 19 is applied to the terminal portion 19, most of the moment is transmitted to the housing main body portion 11 (housing 3) via the stress reducing member 9. It has become so. Further, the value of the stress generated at the joint portion 21 between the busbar portion 17 and the substrate 5 is reduced.

With this configuration, it is not necessary to provide the second engaging portion 29 on the cover portion 13, and the configuration of the cover portion 13 can be simplified.

In the terminal fixing structure 1, the first engaging portion 27 is provided on the cover portion 13, and in the terminal fixing structure 1a, the first engaging portion 27 is provided on the housing body portion 11. However, the first engaging portion 27 may be provided on both the housing body portion 11 and the cover portion 13 . In this case, the first engaged portion 23 of the stress reducing member 9 is configured to engage with the first engaging portion 27 of the housing body portion 11 and the first engaging portion 27 of the cover portion 13. Become.

Although the present embodiment has been described above, the present embodiment is not limited to these, and various modifications are possible within the scope of the gist of the present embodiment.

REFERENCE SIGNS LIST 1 terminal fixing structure 3 housing 5 substrate 7 terminal with busbar 9 stress reducing member 11 housing main body 13 cover 17 busbar 19 terminal 21 joint 23 first engaged portion 25 second engaged Part 27 First engaging part 29 Second engaging part

Claims (6)

a housing configured with a housing main body and a cover installed on the housing main body;
a substrate installed in the housing;
The busbar portion is configured to include a busbar portion and a terminal portion installed on the busbar portion, and the busbar portion is installed on the substrate by joining the busbar portion to the substrate, and at least a portion of the terminal portion a terminal with a busbar protruding from the housing;
In order to reduce the value of the stress generated in the joint portion between the busbar portion and the substrate due to the force applied to the terminal portion of the busbar-attached terminal, the busbar-equipped terminal and the casing are engaged with each other to reduce the value of the stress generated in the joint portion of the busbar portion and the substrate. a stress reduction member disposed within the body;
Fixed structure of the terminal having The stress reducing member is provided with a first engaged portion and a second engaged portion,
The cover portion is provided with a first engaging portion with which the first engaged portion is engaged,
The terminal with busbar is provided with a second engaging portion with which the second engaged portion is engaged,
Since the first engaged portion is engaged with the first engaging portion and the second engaged portion is engaged with the second engaging portion, applied to the terminal portion, the moment is transmitted to the cover portion via the stress reducing member, and is generated at the joint portion between the busbar portion and the substrate. 2. The terminal fixing structure according to claim 1, which is configured to reduce the value of the stress applied. The stress reducing member is provided with a first engaged portion and a second engaged portion,
The housing main body is provided with a first engaging portion with which the first engaged portion is engaged,
The terminal with busbar is provided with a second engaging portion with which the second engaged portion is engaged,
Since the first engaged portion is engaged with the first engaging portion and the second engaged portion is engaged with the second engaging portion, When a moment about the central axis of the terminal part is applied to the terminal part, the moment about the central axis is transmitted to the housing main body part through the stress reducing member, and the bus bar part and the substrate 2. The terminal fixing structure according to claim 1, wherein the terminal fixing structure is configured to reduce the value of stress generated in a joint portion between the terminal and the terminal. The stress reducing member, the busbar portion, and the substrate are aligned in the height direction of the housing between the housing main body portion and the cover portion, and the stress reducing member, the busbar portion, and the a substrate is sandwiched between the housing main body and the cover,
Due to the sandwiching, when a moment about an axis perpendicular to the central axis of the terminal part of the force is applied to the terminal part, A moment is transmitted to the housing main body and the cover through the stress reducing member, and is configured to reduce a value of stress generated at a joint portion between the busbar and the substrate. The terminal fixing structure according to any one of claims 1 to 3. 5. The terminal fixing structure according to any one of claims 1 to 4, wherein the stress reducing member is provided integrally with the terminal portion of the busbar-equipped terminal. 6. The terminal fixing structure according to any one of claims 1 to 5, which is employed in an electric circuit of a battery pack of an automobile.

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