JP2022190887A - Electric connection structure - Google Patents

Abstract

To provide an electric connection structure which can deal with differences in specifications by attaching or detaching a block including bus bars and a case which houses the bus bars and achieves good attachment/detachment workability.SOLUTION: In an electric connection structure 1, a second case 22 which houses a second bus bur is attached to a first case 12 which houses a first bus bar 11. In a state that the first bus bar 11 and the second bus bar are overlapped, a shaft part of a bolt B is inserted into through holes provided at the first bus bar 11 and the second bus bar and engaged with an insertion hole of a nut provided at the second case 22. The bolt B and the nut are fastened to each other to establish electric continuity between the first bus bar 11 and the second bus bar and fix the first case 12 and the second case 22 to each other.SELECTED DRAWING: Figure 1

Description

The present invention relates to an electrical connection structure.

2. Description of the Related Art Electrical connection boxes such as junction boxes and fuse boxes mounted on vehicles have different required circuit configurations, such as the presence or absence of power supply input/output terminals, depending on vehicle specifications. As an example, an electric connection box mounted on an electric vehicle such as a hybrid engine vehicle is provided with a relief terminal for receiving battery charge from another vehicle. In this way, although the necessary circuit configuration differs depending on the vehicle specifications, in order to be able to use a common electrical junction box regardless of the vehicle specification differences, the electrical junction box is equipped with the maximum specifications of rescue terminals, bus bars, and terminal fastenings. A division is established. On the other hand, an electrical connection box has been proposed in which optional circuits can be added as needed (see, for example, Patent Document 1).

JP 2018-7424 A

The electrical connection box described in Patent Document 1 includes a base box body that houses a base circuit including base circuit bus bars, and an option box body that houses option circuits including option circuit bus bars. In this electrical connection box, the option box main body can be detachably attached to the peripheral wall of the base box main body. In addition, the base circuit side joint portion protruding from the base circuit bus bar and the option circuit side joint portion protruding from the option circuit bus bar are joined to each other. With this configuration, when the option circuit is not needed, the option box main body is removed to prevent wasted space.

In Patent Literature 1, the base circuit bus bar and the option circuit bus bar are joined by mechanical clinching, with the respective joining portions superimposed on separately formed joining plate members. Therefore, when adding an optional circuit, it is necessary to use a special punch and die to join the base circuit bus bar and the optional circuit bus bar. There was room for

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to provide an electric power supply unit capable of coping with differences in specifications and having good attachment/detachment workability by attaching/detaching a block including a bus bar and a case that accommodates the bus bar. The object is to provide a connection structure.

In order to achieve the above objects, an electrical connection structure according to the present invention is characterized by the following (1) to (5).
a first busbar having a first flat plate portion and having a first through hole provided in the first flat plate portion;
a first case that accommodates the first busbar;
a second bus bar having a second flat plate portion and having a second through hole provided in the second flat plate portion;
a first fastening member electrically connected to the second bus bar;
a second case that accommodates the second bus bar, is provided with the first fastening member, and is attached to the first case;
one of the first fastening member and the second fastening member engaged with the first fastening member has a shaft portion and a head portion provided on one end side of the shaft portion;
the other of the first fastening member and the second fastening member has an insertion hole through which the shaft portion is inserted and locked to the shaft portion;
The second case is attached to the first case, and the shaft portion is inserted through the first through hole and the second through hole in a state in which the first flat plate portion and the second flat plate portion are overlapped. By being engaged with the insertion hole, the first bus bar and the second bus bar are electrically connected, and the first case and the second case are fixed.
(2) The second bus bar has a conductive relief terminal to which the clip portion of the booster cable is connected.
The electrical connection structure according to (1) above.
(3) the second case has a terminal accommodating chamber capable of accommodating a terminal having a third through hole through which the shaft portion is inserted;
The terminal is superimposed on the first bus bar and the second bus bar, and the shaft portion is inserted through the first through hole, the second through hole, and the third through hole to form the through hole. are engaged with the first bus bar and the second bus bar, and are fixed in the terminal accommodating chamber;
The electrical connection structure according to (1) or (2) above.
(4) the relief terminal is provided at one end of the second flat plate portion;
The second through hole is provided at the other end of the second flat plate portion,
A terminal having a third through hole through which the shaft portion is inserted is superimposed on the first bus bar and the second bus bar, and the shaft portion extends through the first through hole, the second through hole and the inserted through a third through-hole and locked to the through-hole;
The electrical connection structure according to (2) above.
(5) the electrical connection structure to which the second bus bar and the second case are not attached is mounted on a gasoline engine vehicle;
The electrical connection structure to which the second bus bar and the second case are attached is mounted on a hybrid engine vehicle,
The electrical connection structure according to any one of (1) to (4) above.

According to the present invention, it is possible to provide an electrical connection box that can cope with specification differences due to the presence or absence of power supply input/output and that is easy to attach and detach by attaching and detaching a block including a bus bar and a case that accommodates the bus bar.

The present invention has been briefly described above. Furthermore, the details of the present invention will be further clarified by reading the following detailed description of the invention (hereinafter referred to as "embodiment") with reference to the accompanying drawings. .

FIG. 1 is a perspective view of an electrical connection structure according to an embodiment of the invention. 2 is a perspective view showing a state in which terminals are removed from the electrical connection structure shown in FIG. 1. FIG. 3 is a perspective view showing a state in which the terminals and the second block are removed in the electrical connection structure shown in FIG. 1. FIG. 4 is a perspective view of the second block shown in FIG. 1. FIG. FIG. 5 is a perspective view of the second block viewed from the front side. FIG. 6 is an exploded perspective view of the second block. 7 is a perspective view of the first bus bar shown in FIG. 1. FIG. FIG. 8 is a sectional view taken along the line AA in FIG. 1. FIG.

Specific embodiments relating to the present invention will be described below with reference to each drawing.

FIG. 1 is a perspective view of an electrical connection structure 1 according to an embodiment. FIG. 2 is a perspective view showing a state in which the round terminal T is removed from the electrical connection structure 1. FIG. FIG. 3 is a perspective view showing a state in which the round terminal T and the second block 20 are removed from the electrical connection structure 1. FIG. 4 is a perspective view of the second block 20 shown in FIG. 1. FIG. FIG. 5 is a perspective view of the second block 20 as seen from the front side. FIG. 6 is an exploded perspective view of the second block 20. FIG. FIG. 7 is a perspective view of first bus bar 11 shown in FIG. FIG. 8 is a cross-sectional view taken along line AA in FIG. Hereinafter, for convenience of explanation, as shown in FIG. Define "below". "Front-back direction", "left-right direction" and "up-down direction" are orthogonal to each other.

The electrical connection structure 1 is housed in an electrical connection box such as a junction box or a fuse box mounted on a vehicle such as an automobile, and constitutes a part of the electrical connection box. The electric connection box is connected between a power supply such as a battery or an alternator and various auxiliary equipment installed in the vehicle, and distributes the power supplied from the power supply to the auxiliary equipment via various electronic components. do.

The electrical connection structure 1 includes a first block 10, a second block 20, and a circuit structure 30, as shown in FIG.
According to the configuration shown in FIG. 1, the electrical connection structure 1 can use a relief terminal 212B (see FIG. 6), which will be described later, and can be connected to a round terminal T (see FIG. 2). 2, the electrical connection structure 1 can use the relief terminal 212B without connecting the round terminal T to the second block 20. As shown in FIG. Furthermore, as shown in FIG. 3, the electrical connection structure 1 can use only the first block 10 and the circuit structure 30 without attaching the second block 20 to the first block 10 and the circuit structure 30. is. In this manner, the electrical connection structure 1 has the first block 10 and the circuit structure 30 as a basic configuration, and the second block 20 can be added according to the specifications. The electrical connection structure 1 to which the second block 20 is attached, shown in FIGS. 1 and 2, is mounted on a gasoline engine vehicle, and the electrical connection structure 1 to which the second block 20 is not attached, shown in FIG. Installed in engine vehicles.

(Circuit structure 30)
The circuit structure 30 has a resin case, and various electrical components such as a bus bar, which is a conductive plate material for wiring, and relays and fuses, which are housed in a housing space inside the case. As shown in FIG. 3 , the circuit structure 30 has a main body portion 31 having a substantially L-shape when viewed in the vertical direction, and a projecting portion 32 projecting rightward from the main body portion 31 .

(first block 10)
The first block 10 has a first bus bar 11 that is a conductive plate material and a first case 12 that is made of insulating resin and accommodates the first bus bar 11 . The first block 10 can be attached to the circuit structure 30 .

The first bus bar 11 has flat portions 111 and 112 and bent portions 113 and 114, as shown in FIG. The first bus bar 11 can be used for the maximum voltage value when the second bus bar 21, which will be described later, is connected, that is, it is designed for maximum specifications.

The flat plate portion 111 is a substantially rectangular member that extends in the left-right direction, is slightly bent near the center, and has a plurality of strip-like terminals and tuning fork terminals for connecting electrical components.
The flat plate portion 112 is a substantially rectangular member extending rightward from the right end of the flat plate portion 111, and is provided with a circular through hole 11A (first through hole).
The bent portion 113 has a strip-shaped terminal at the rear end of the bent plate extending rightward from the right end portion of the flat plate portion 112 and bent backward, and has a substantially L shape when viewed in the vertical direction.
The bent portion 114 is a bent plate that is bent forward from the left end of the flat plate portion 111, extends leftward, and is bent forward. A surface of the bent portion 114 that extends in the front-rear direction and is separated from the flat plate portion 111 serves as a terminal connection portion. The bent portion 114 is accommodated inside the case of the circuit structure 30, and a round terminal for power input, for example, is fastened with a nut to a bolt fixed to the case, thereby forming the first bus bar 11. is fixed to the circuit structure 30 .

As shown in FIG. 3, the first case 12 has a case body 121, a projecting portion 122, and a busbar locking portion 123, and is attached to the circuit structure 30 via a locking mechanism so as to be mountable.

The case body 121 extends in the left-right direction, has a substantially rectangular parallelepiped shape with open top and bottom surfaces, and accommodates the flat plate portion 111 of the first bus bar 11 . The case main body 121 has a plurality of engaging claws inside and engages with a plurality of openings (see FIG. 7) respectively provided at the bases of the plurality of strip-shaped terminals of the first busbar 11 .
The projecting portion 122 projects rightward from the case body 121 and accommodates the right end portion of the flat plate portion 111 and the flat plate portion 112 . Protruding portion 122 has an engaging claw inside and engages with an opening provided in bent portion 113 of first bus bar 11 . The projecting portion 122 has a substantially rectangular parallelepiped shape with a relatively small thickness in the front-rear direction, and has an open front surface, an upper surface, and a lower surface. The through hole 11A of the first bus bar 11 and the flat plate portion 112 around the through hole 11A are exposed from the opening 122A.
The busbar locking portion 123 is a prismatic member that accommodates the bent portion 113 of the first busbar 11 . part).

(Assembly of first block 10)
The first bus bar 11 rises from below the first case 12 , the flat plate portion 111 is inserted into the case main body 121 , and the flat plate portion 112 and the bent portion 113 are inserted into the projecting portion 122 . Thus, the first bus bar 11 is housed in the first case 12 and held inside by the plurality of engaging claws. Electrical parts such as relays and fuses are attached to the first block 10 from above.

(Second block 20)
As shown in FIG. 6, the second block 20 is fixed in a second bus bar 21 that is a conductive plate, a second case 22 made of insulating resin that accommodates the second bus bar 21, and the second case 22. a nut 23; As shown in FIGS. 4 and 5, the second block 20 has a cap C, a bolt B, and a stud bolt S, which will be described later. In FIG. there is

The second bus bar 21 has a flat plate portion 211, a flat plate portion 212 (second flat plate portion), a bent portion 213, and a connection portion 214, as shown in FIG.
The flat plate portion 211 is a substantially rectangular member that extends in the left-right direction, and is slightly bent at an intermediate portion on the right side.

The flat plate portion 212 is a substantially rectangular plate extending leftward through an extension portion extending rearward from the left end of the flat plate portion 211 and having a length in the vertical direction longer than the length in the horizontal direction. The flat plate portion 212 is provided with a circular through hole 21A (second through hole) at a position slightly to the left of the lower center. A round terminal T shown in FIG. That is, one end on the lower side of the flat plate portion 212 serves as a connecting portion 212A to which a terminal such as a round terminal T is connected. The round terminal T has at one end a circular through hole T1 (third through hole) through which the shaft portion B1 of the bolt B is inserted, and at the other end to which an electric wire is connected. The other end on the upper side of the flat plate portion 212 serves as a relief terminal 212B. The relief terminal 212B is electrically connected to the battery and serves as a connection destination of the clip portion of the booster cable. By connecting the clip portion of the booster cable to the rescue terminal 212B, it is possible to charge the battery of the hybrid engine vehicle.

The bent portion 213 is a plate-like member that extends forward from the lower end of the right end portion of the flat plate portion 212 and is bent upward. Bending portion 213 has an L shape when viewed in the left-right direction.
The connecting portion 214 is a substantially square plate member extending forward from the end of the bent portion 213 opposite to the portion connected to the flat plate portion 212 . The connecting portion 214 has a circular through hole 21B in the center. A shaft portion of a stud bolt S (see FIG. 4) fixed in the second case 22 is inserted through the through hole 21B.

As shown in FIG. 4, the second case 22 has a terminal accommodating portion 221, a protective portion 220, a bus bar accommodating portion 222, and a bolt holding portion 223, and has a substantially L shape when viewed vertically. The second case 22 accommodates the second bus bar 21, and a nut 23 (see FIG. 6) is fixed inside. The second case 22 accommodates the projecting portion 122 of the first block 10 inside, and is attached to the first case by being fastened with a bolt B and a nut 23 . The second case 22 is attached to the circuit structure 30 via a plurality of locking portions R, which will be described later.

The terminal accommodating portion 221 has a hollow rectangular parallelepiped shape with an open lower surface, and has a terminal accommodating chamber TC capable of accommodating a round terminal T (see FIG. 2) therein. The terminal accommodating portion 221 has a groove on the inner wall on the front side thereof for holding the upper end portion and the left and right side end portions of the flange 232 of the nut 23 and holds the nut 23 . As shown in FIG. 8 , in the terminal accommodating portion 221 , the connection portion 212 A of the second bus bar 21 is arranged behind the nut 23 so as to be in contact therewith, and the nut 23 is electrically connected to the second bus bar 21 . The terminal accommodating portion 221 has an opening 221A formed from the rear end side of the upper surface to the rear surface.

The opening 221A has a shape corresponding to the opening 122A of the first case 12, that is, has a U-shaped contour. The opening 221A exposes the connecting portion 212A of the second bus bar 21 accommodated in the terminal accommodating portion 221, as shown in FIG. Mounting of the round terminal T and fastening of the bolt B can be performed through the opening 221A.

The terminal accommodating portion 221 has a rectangular opening 221B on the left side. The opening 221B extends upward from the lower end of the left side surface of the terminal accommodating portion 221 . When the second block 20 is attached to the first block 10, the projecting portion 122 of the first block 10 is inserted into the terminal accommodating chamber TC from below the terminal accommodating portion 221 through the opening 221B and accommodated therein. .

The protection part 220 is provided above the terminal accommodating part 221 and protects the relief terminal 212B. The protection part 220 has a cap C and support parts 2201, 2202 and 2203, as shown in FIGS.

The cap C has a cover portion that covers the upper surface and left and right side surfaces of the rescue terminal 212B, a rotation shaft provided at the right end of the cover portion, and a locking claw provided at the left end of the cover portion.
The support portion 2201 extends upward from the right side wall of the terminal accommodating portion 221 and supports the pivot shaft of the cap C. As shown in FIG. The support portion 2201 covers the right side surface of the relief terminal 212B.
The support portion 2202 is a member that extends upward from the front and left sides of the terminal housing portion 221, and has a locking portion that engages with the locking claw of the cap C at its upper portion. The support portion 2202 covers the left side surface of the relief terminal 212B.

The support portion 2203 is a member that extends upward on the upper front side of the terminal accommodating portion 221 and has a flat portion on the front side, and covers the rear surface of the relief terminal 212B. The planar portion of the support portion 2203 extends along the relief terminal 212B and has a shape corresponding to the relief terminal 212B.

When using the relief terminal 212B, the worker presses the locking claw of the cap C to release the engagement with the locking portion, rotates the cap C around the rotation shaft, and exposes the relief terminal 212B. . The rescue terminal 212B and the support portion 2203 are put together and clamped by the clip portion of the booster cable.

The busbar accommodating portion 222 extends rightward from the terminal accommodating portion 221 and is a substantially rectangular parallelepiped member having open upper and lower surfaces, and accommodates the flat plate portion 211 of the second busbar 21 . Engagement claws are provided inside the busbar accommodating portion 222 and engage with openings provided in the flat plate portion 211 of the second busbar 21 . The busbar housing portion 222 has a locking portion R at the center in the left-right direction on the rear surface. The locking portion R has a locking portion R1 and a pair of sliding portions R2 provided on the left and right sides of the locking portion R1, and is slidably locked to a locking mechanism provided on the circuit structure 30. As shown in FIG.

The bolt holding portion 223 is a member extending forward from the right end portion of the busbar accommodating portion 222, and has a mounting portion 2231 and a fixing portion 2232 as shown in FIG.

The mounting portion 2231 has a shape along the bent portion 213 of the second busbar 21 , and the projecting portion 32 of the circuit structure 30 is mounted via the second busbar 21 as shown in FIG. 1 and the like. Each standing wall on the front side and the rear side of the mounting portion 2231 is provided with an engaging claw on each opposing surface. These engaging claws engage openings provided corresponding to bent portions 213 of second bus bar 21 .

The fixing portion 2232 is a substantially rectangular parallelepiped member that is provided continuously with the mounting portion 2231, and has an accommodating portion at the upper portion for sandwiching the flange F (see FIG. 4) of the stud bolt S. fixed. Locking portions R are provided on the front and left side surfaces of the fixing portion 2232 as shown in FIG.

The nut 23 has a cylindrical portion 231 having a cylindrical through hole in the center, and a flange 232 provided on the front side of the cylindrical portion 231 and having a circular through hole in the center. A through hole continuous with the through hole of the cylindrical portion 231 and the flange 232 is an insertion hole 233 having a helical thread groove on the inner peripheral surface thereof, through which the bolt B is inserted.

The bolt B is, as shown in FIG. 8, a stud bolt having a shaft portion B1 and a head portion B2 provided on one end side of the shaft portion B1. A helical thread is provided on the outer peripheral surface of the shaft portion B<b>1 and is screwed with the thread groove of the nut 23 . That is, the shaft portion B1 of the bolt B is inserted through the insertion hole 233 of the nut 23 and locked to the shaft portion B1.

(Assembly of second block 20)
Assembly of the second block 20 configured as described above will be described with reference to FIG. The second bus bar 21 descends from above the second case 22 , the connecting portion 212 A is inserted into the terminal accommodating portion 221 , the flat plate portion 211 is inserted into the bus bar accommodating portion 222 , and the bent portion 213 and the connecting portion 214 are inserted. are placed on the placing portion 2231 and the fixing portion 2232 . In this manner, the second bus bar 21 is housed in the second case 22 and held inside by the three engaging claws. A cap C is rotatably attached to the protection portion 220 of the second case 22 housing the second bus bar 21 .

On the other hand, the nut 23 rises from below the second case 22 and is inserted into the terminal accommodating portion 221, and the upper end and the left and right side ends of the flange 232 are clamped and fixed in the grooves in the terminal accommodating portion 221. be done.

(Attachment of second block 20 to first block 10 and circuit structure 30)
Attachment of the second block 20 to the first block 10 and the circuit structure 30 will be described. When adding the second block 20 , the second block 20 assembled as described above is attached to the first block 10 before being attached to the circuit structure 30 .

The second block 20 is arranged on the upper right side of the first block 10, and the projecting portion 122 of the first block 10 is inserted into the terminal accommodating chamber TC from below the terminal accommodating portion 221 through the opening 221B, and the flat plate The portion 112 and the connection portion 212A of the flat plate portion 212 are superimposed. Then, the first block 10 and the second block 20 with the projecting portions 122 accommodated in the terminal accommodating chambers TC are brought close to the circuit structure 30 from below, and the opening provided in the case of the main body 31 is closed. The bent portion 114 is inserted into the case of the main body portion 31 via the .

At this time, the projecting portion 32 is placed on the placing portion 2231 , and the first block 10 and the second block 20 are attached to the circuit structure 30 by locking mechanisms provided on the outer peripheries of the first case 12 and the second case 22 . is locked. That is, the second case 22 is attached to the first case 12 in a state in which the flat plate portion 112 and the connecting portion 212A of the flat plate portion 212 are overlapped.

When the second block 20 is attached to the first block 10 and locked to the circuit structure 30 , the upper end of the connecting portion of the protrusion 122 with the case main body 121 is positioned at the left side of the terminal accommodating portion 221 . It is arranged in contact with the portion forming the upper edge of the opening 221B on the surface. Further, the right side surface of the case main body 121 and the left side surface of the terminal accommodating portion 221 are arranged in contact with each other.

When the round terminal T is to be connected to the connection portion 212A (see FIG. 1), the round terminal T is superimposed on the flat plate portion 112 and the connection portion 212A. As shown in FIG. 8, the bolt B is inserted into the terminal accommodating chamber TC through the openings 22A and 12A, and the shaft portion B1 is inserted through the through holes T1, 11A, and 21A. The connecting portion 212A contacts the rear end surface of the cylindrical portion 231 of the nut 23, and the connecting portion 212A, the flat plate portion 112, and one end of the round terminal T are in close contact with each other. , and the shaft portion B1 is screwed into the insertion hole 233 of the nut 23 and locked. Therefore, the flat plate portion 112, the connecting portion 212A, and the round terminal T are sandwiched between the front end surface of the head B2 and the rear end surface of the cylindrical portion 231 of the nut 23, and are fastened. In this manner, the second block 20 is fixed to the first block 10 and the circuit structure 30 with the round terminals T connected below the relief terminals 212B.

On the other hand, when the round terminal T is not connected to the connecting portion 212A as shown in FIG. state. In this state, when the shaft portion B1 is rotated until the front end surface of the head portion B2 contacts the rear surface of the flat plate portion 112, the connection portion 212A and the flat plate portion 112 are fastened by the bolt B and the nut 23. Thus, the second block 20 including the relief terminals 212B is fixed to the first block 10 and the circuit structure 30. FIG.

As described above, according to the electrical connection structure 1, the second case 22 is attached to the first case 12, and the flat plate portion 112 and the connection portion 212A are superimposed on each other. The first bus bar 11 and the second bus bar 21 are fastened. By this fastening, the first bus bar 11 and the second bus bar 21 are electrically connected, and the first case 12 and the second case 22 are fixed. Therefore, in the electrical connection box that accommodates the electrical connection structure 1 having the configuration described above, the first block 10 including the first bus bar 11 and the first case 12 is commonly used regardless of the specifications, and if necessary, the first block 10 is used in common. , the second block 20 including the second bus bar 21 and the second case 22 can be added. That is, by attaching and detaching the second block 20, it is possible to cope with the difference in specifications due to the presence or absence of power supply input/output.

Further, according to the electrical connection structure 1, the nut 23 is fixed to the second case 22, the shaft portion B1 of the bolt B is inserted through the through holes 11A and 21A, and is locked to the insertion hole 233 of the nut 23. . Thus, by fastening the bolt B and the nut 23, the first bus bar 11 and the second bus bar 21 can be fixed, and the first case 12 and the second case 22 can be fixed, so that the second bus bar 21 can be fixed. The attachment and detachment of the second block 20 can be performed with good workability.

Furthermore, according to the electrical connection structure 1, the relief terminal 212B and the through hole 21A are arranged in the flat plate portion 212, and the round shape is provided on the peripheral edge portion of the through hole 21A in the connection portion 212A of the flat plate portion 212 via the flat plate portion 112. Terminal T is connected. Therefore, the relief terminal 212B and the round terminal T are arranged side by side in the vertical direction. Therefore, the round terminal T can be fastened without deteriorating the space efficiency.

It should be noted that the present invention is not limited to the above-described embodiments, and can be modified, improved, etc. as appropriate. In addition, the material, shape, size, numerical value, form, number, location, etc. of each component in the above-described embodiment are arbitrary and not limited as long as the present invention can be achieved. For example, in the above-described embodiment, the bolt B and the nut 23 fixed to the second block 20 are the fastening members. may engage.

Here, the characteristics of the electrical connection structure 1 according to the embodiment of the present invention described above are summarized and listed briefly in [1] to [5] below.
[1] A first bus bar (11) having a first flat plate portion (flat plate portion 112) and having a first through hole (through hole 11A) provided in the first flat plate portion;
a first case (12) that accommodates the first busbar;
a second bus bar (21) having a second flat plate portion (flat plate portion 212) and having a second through hole (through hole 21A) provided in the second flat plate portion;
a first fastening member (nut 23) that conducts with the second bus bar;
a second case (22) that accommodates the second bus bar, is provided with the first fastening member, and is attached to the first case;
Either one of the first fastening member (nut 23) and the second fastening member (bolt B) that engages with the first fastening member is provided on the shaft portion (B1) and one end side of the shaft portion. and a head (B2),
the other of the first fastening member and the second fastening member has an insertion hole (233) into which the shaft portion is inserted and locked by the shaft portion;
The second case is attached to the first case, and the shaft portion is inserted through the first through hole and the second through hole in a state in which the first flat plate portion and the second flat plate portion are overlapped. the first bus bar and the second bus bar are electrically connected and the first case and the second case are fixed by being locked in the insertion hole;
An electrical connection structure (1).
[2] The second bus bar has a conductive relief terminal (212B) to which the clip portion of the booster cable is connected.
The electrical connection structure according to [1] above.
[3] The second case has a terminal accommodating chamber (TC) capable of accommodating a terminal (round terminal T) having a third through hole (through hole T1) through which the shaft portion is inserted,
The terminal is superimposed on the first bus bar and the second bus bar, and the shaft portion is inserted through the first through hole, the second through hole, and the third through hole to form the through hole. are engaged with the first bus bar and the second bus bar, and are fixed in the terminal accommodating chamber;
The electrical connection structure according to the above [1] or [2].
[4] The relief terminal is provided at one end of the second flat plate portion,
The second through hole is provided at the other end of the second flat plate portion,
A terminal (round terminal T) having a third through hole (T1) through which the shaft portion is inserted is superimposed on the first bus bar and the second bus bar, and the shaft portion extends through the first through hole (T1). is inserted through the hole, the second through hole, and the third through hole, and is locked in the through hole;
The electrical connection structure according to [2] above.
[5] The electrical connection structure to which the second bus bar and the second case are not attached is mounted on a gasoline engine vehicle,
The electrical connection structure to which the second bus bar and the second case are attached is mounted on a hybrid engine vehicle,
The electrical connection structure according to any one of [1] to [4] above.

According to the configuration [1] above, the second case is attached to the first case, and in a state where the first flat plate portion of the first bus bar and the second flat plate portion of the second bus bar are overlapped, the first and second 2 Fasten with a fastening member. By this fastening, the first bus bar and the second bus bar are electrically connected, and the first case and the second case are fixed. For this reason, in the electrical connection box housing the electrical connection structure configured as described above, the first block including the first bus bar and the first case is commonly used regardless of specifications, and the second block is used as necessary. A second block including busbars and a second case can be added. That is, by attaching and detaching the second block, it is possible to cope with the difference in specifications due to the presence or absence of power supply input/output.
Further, according to the configuration [1] above, the first fastening member is provided in the second case, and the first bus bar and the second bus bar can be fastened by the second fastening member. can be attached and detached with good workability.

According to the configuration [2] above, a relief terminal can be added to an electrical connection structure that does not have a relief terminal. Therefore, as compared with the case of using an electrical connection structure provided with a relief terminal in advance so that it can be applied to a specification that does not require a relief terminal, a structure corresponding to each specification can be realized at a low cost.

According to the above configuration [3], since the terminals can be fastened together at the fastening points of the first bus bar and the second bus bar, it is possible to easily connect the power supply input/output lines with the terminals.

According to the configuration [4] above, the relief terminal and the second through hole are arranged in the second flat plate portion, and the terminal is connected to the peripheral edge portion of the second through hole in the second flat plate portion. are arranged in one direction. Therefore, the terminals can be fastened without deteriorating the space efficiency.

According to the above configuration [5], the electrical connection structure for a gasoline engine vehicle and the electrical connection structure for a hybrid engine vehicle can share the first bus bar and the first case. The manufacturing cost of the structure can be reduced.

1 Electrical connection structure 10 First block 11 First busbars 11A, 21A, 21B, T1 Through hole 12 First case 12A Opening 20 Second block 21 Second busbar 22 Second case 22A, 122A, 221A, 221B Opening 23 Nut 30 Circuit structure 31 Main body 32 Protruding parts 111, 112, 211, 212 Flat plate parts 113, 114, 213 Bending part 121 Case main body 122 Protruding part 123 Busbar locking parts 212A, 214 Connecting part 212B Relief terminal 220 Protective part 221 Terminal accommodating portion 222 Bus bar accommodating portion 223 Bolt holding portion 231 Cylindrical portion 232, F Flange 233 Insertion holes 2201, 2202, 2203 Supporting portion 2231 Mounting portion 2232 Fixing portion B Bolt B1 Shaft portion B2 Head C Cap R Locking portion S Stud bolt T Round terminal TC Terminal chamber

Claims (5)

a first busbar having a first flat plate portion and having a first through hole provided in the first flat plate portion;
a first case that accommodates the first busbar;
a second bus bar having a second flat plate portion and having a second through hole provided in the second flat plate portion;
a first fastening member electrically connected to the second bus bar;
a second case that accommodates the second bus bar, is provided with the first fastening member, and is attached to the first case;
one of the first fastening member and the second fastening member engaged with the first fastening member has a shaft portion and a head portion provided on one end side of the shaft portion;
the other of the first fastening member and the second fastening member has an insertion hole through which the shaft portion is inserted and locked to the shaft portion;
The second case is attached to the first case, and the shaft portion is inserted through the first through hole and the second through hole in a state in which the first flat plate portion and the second flat plate portion are overlapped. the first bus bar and the second bus bar are electrically connected and the first case and the second case are fixed by being locked in the insertion hole;
Electrical connection structure. The second bus bar has a conductive relief terminal to which the clip portion of the booster cable is connected,
The electrical connection structure according to claim 1. The second case has a terminal accommodating chamber capable of accommodating a terminal having a third through hole through which the shaft portion is inserted,
The terminal is superimposed on the first bus bar and the second bus bar, and the shaft portion is inserted through the first through hole, the second through hole, and the third through hole to form the through hole. are engaged with the first bus bar and the second bus bar, and are fixed in the terminal accommodating chamber;
The electrical connection structure according to claim 1 or 2. The relief terminal is provided at one end of the second flat plate portion,
The second through hole is provided at the other end of the second flat plate portion,
A terminal having a third through hole through which the shaft portion is inserted is superimposed on the first bus bar and the second bus bar, and the shaft portion extends through the first through hole, the second through hole and the inserted through a third through-hole and locked to the through-hole;
The electrical connection structure according to claim 2. The electrical connection structure to which the second bus bar and the second case are not attached is mounted on a gasoline engine vehicle,
The electrical connection structure to which the second bus bar and the second case are attached is mounted on a hybrid engine vehicle,
The electrical connection structure according to any one of claims 1 to 4.

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