JP2021111524A - Bus bar and electrical connection box - Google Patents

Abstract

To provide a bus bar and an electrical connection box, which can be easily manufactured at low cost.SOLUTION: A bus bar 40 for vehicles includes a plurality of first pieces 41 comprising a conductive plate material and having the same shape. Such first pieces 41 are superposed so as to align an outer shape in plan view and form one bus bar 40.SELECTED DRAWING: Figure 4

Description

The present disclosure relates to a bus bar and an electrical junction box using the bus bar.

Conventionally, a substrate using a conductive member (also referred to as a bus bar) constituting a circuit for conducting a relatively large current is generally known. Further, such a bus bar is plated in order to improve the reliability of connection and the like.

In Patent Document 1, the corners between the main surface and the side surface are rounded, recesses are formed on the side surfaces, and the bus bar is covered with an insulating coating to prevent burrs and the like from being formed on the surface of the bus bar. As a result, a bus bar with enhanced durability of the insulating film is disclosed.

JP-A-2018-200848

On the other hand, for example, a bus bar to which a high voltage of 300 V or more is applied is manufactured from a thick conductive plate material in view of reduction of electric resistance, risk of heat generation, and the like. However, when manufacturing a bus bar using a thick plate material, the press processing of the progressive mold cannot be used because of the thick plate, and the single mold and transfer press processing of the standard length material are used, and it is suitable for the thin plate. The pre-plating material cannot be used and the post-plating will be used. Therefore, there is a problem that the processing cost is high and the yield is low.

However, the bus bar according to Patent Document 1 does not consider such a problem and cannot be solved.

The present invention has been made in view of such circumstances, and an object of the present invention is to provide a bus bar and an electric junction box that can be easily manufactured at a lower cost.

The bus bar according to the embodiment of the present disclosure is a bus bar for a vehicle, and includes a plurality of first pieces of the same shape made of a conductive plate material, and the plurality of first pieces are superimposed.

The electrical junction box according to the embodiment of the present disclosure includes the above-mentioned bus bar and a connecting portion connected to the bus bar and connected to an external terminal.

According to the present disclosure, it is possible to provide a bus bar and an electric junction box that can be easily manufactured at a lower cost.

It is a top view of the electric junction box which concerns on Embodiment 1. FIG. It is a side view of the electric connection box which concerns on Embodiment 1. FIG. It is a bottom view which shows the state which removed the lower case in the electric connection box which concerns on Embodiment 1. FIG. It is a perspective view which shows an example of the bus bar attached to the electric connection box which concerns on Embodiment 1. FIG. It is explanatory drawing explaining the attachment to the pedestal of the bus bar of the electric junction box which concerns on Embodiment 1. FIG. It is explanatory drawing explaining the manufacturing method of the bus bar of the electric junction box which concerns on Embodiment 1. FIG. It is a perspective view which shows the bus bar of the electric connection box which concerns on Embodiment 2. FIG. It is a perspective view which shows the 2nd piece of the bus bar which concerns on Embodiment 2. FIG. It is explanatory drawing explaining the attachment to the pedestal of the bus bar of the electric junction box which concerns on Embodiment 2. FIG. 9 is a vertical cross-sectional view taken along line XX of FIG. 9 in a state where the bus bar is attached to the pedestal. It is a perspective view which shows the bus bar of the electric junction box which concerns on Embodiment 3. FIG. 11 is a partial cross-sectional view taken along line XX of FIG. It is a perspective view which shows the bus bar of the electric connection box which concerns on Embodiment 4. FIG. It is a perspective view which shows the 3rd piece of the bus bar of the electric junction box which concerns on Embodiment 4. FIG. It is a perspective view which shows the bus bar of the electric junction box which concerns on Embodiment 5. It is a perspective view which shows the 4th piece of the bus bar of the electric junction box which concerns on Embodiment 5.

[Explanation of Embodiments of the Present Invention]
First, embodiments of the present disclosure will be listed and described. In addition, at least a part of the embodiments described below may be arbitrarily combined.

(1) The bus bar according to the embodiment of the present disclosure is a bus bar for a vehicle, and includes a plurality of first pieces of the same shape made of a conductive plate material, and the plurality of first pieces are superimposed.

In the present embodiment, one bus bar is formed by superimposing a plurality of first pieces. Thin plates can be pressed, and it is easier to manufacture more complicated shapes than thick plates. Therefore, when the bus bar has a complicated shape including a bent portion, productivity and workability can be improved by superimposing a plurality of first pieces to manufacture such a bus bar.

(2) The bus bar according to the embodiment of the present disclosure is provided on a superimposing portion having the same shape as the first piece and superposed on the plurality of first pieces, and on the edge of the superimposing portion, and is a fixed object. It is provided with a second piece having a positioning portion for positioning with respect to.

In the present embodiment, when the bus bar is fixed to the fixing target, the positioning portion of the second piece positions the fixing target. Therefore, the workability in the fixing work to the fixing target is improved.

(3) In the bus bar according to the embodiment of the present disclosure, each first piece has a position matching portion used for positioning with the other first piece.

In the present embodiment, since each first piece has the position matching portion, the positions of the first pieces are aligned by the position matching portion. Therefore, the convenience in handling the bus bar is enhanced.

(4) The bus bar according to the embodiment of the present disclosure includes a third piece having the same shape as the first piece and having a superposed portion superimposed on the plurality of first pieces, and the third piece is It is provided on the edge of the overlapping portion and has an integrated engaging portion that integrates the third piece and the plurality of first pieces.

In the present embodiment, since the third piece has the integrated engaging portion, the third piece and the first piece are integrated by the integrated engaging portion. Therefore, the convenience in handling the bus bar is enhanced.

(5) In the bus bar according to the embodiment of the present disclosure, the plurality of first pieces have engaging recesses that engage with the integrated engaging portion of the third piece.

In the present embodiment, the third piece has the integrated engaging portion, and the plurality of first pieces each have the engaging recess. The third piece and the first piece are integrated by engaging the integrally engaging portion and the engaging recess. Therefore, the convenience in handling the bus bar is enhanced.

(6) The bus bar according to the embodiment of the present disclosure includes at least a cooling medium for cooling the heat generated by the first piece and a holding portion for holding the cooling medium.

In the present embodiment, for example, when heat is generated in the first piece, it is conducted to the cooling medium through the holding portion and cooled. Therefore, it is possible to prevent adverse effects due to heat generation that may occur in the bus bar.

(7) The electrical connection box according to the embodiment of the present disclosure includes any one of the above-mentioned bus bars and a connection portion connected to the bus bar and connected to an external terminal.

In the present embodiment, for example, when an external terminal is inserted into the connection portion, the external terminal is electrically connected to other parts of the electrical junction box via the bus bar.

[Details of Embodiments of the present invention]
The bus bar and the electrical junction box according to the embodiment of the present disclosure will be described below with reference to the drawings. It should be noted that the present invention is not limited to these examples, and is indicated by the scope of claims, and is intended to include all modifications within the meaning and scope equivalent to the scope of claims.

(Embodiment 1)
In the following, the present embodiment will be described by taking as an example an electric junction box for a vehicle equipped with a bus bar according to the embodiment of the present disclosure.

FIG. 1 is a plan view of the electric connection box 100 according to the first embodiment, and FIG. 2 is a side view of the electric connection box 100 according to the first embodiment.

The electric junction box 100 is attached to the outside of the battery pack of an EV (Electric Vehicle), for example. The electrical junction box 100 includes, for example, a housing 50 in which electrical components such as relays are mounted.

The housing 50 is made of, for example, resin, and includes a lower case 52 and an upper case 51 that covers the lower case 52. The housing 50 is attached to the battery pack so that the bottom plate 521 of the lower case 52 faces the EV battery pack.

More specifically, the upper case 51 is provided with bottomed tubular leg portions 511 at four positions, and through holes 512 are formed at the bottom of each leg portion 511. For example, the housing 50 (electrical junction box 100) can be attached to the battery pack by inserting a screw through the through hole 512 of the leg portion 511 and screwing it into the screw hole of the EV battery pack. At this time, the bottom plate 521 of the lower case 52 faces the outer surface of the battery pack.
Hereinafter, for convenience of explanation, the electric junction box 100 side is the upper side and the battery pack side is the lower side in the opposite direction between the electric junction box 100 and the battery pack.

FIG. 3 is a bottom view showing a state in which the lower case 52 is removed in the electrical connection box 100 according to the first embodiment.
The upper case 51 has the shape of a housing whose one side is open, and a bus bar 40, a circuit element, and the like are attached to the inside of the upper case 51.
Further, the upper case 51 has a ceiling plate 30 facing the bottom plate 521 of the lower case 52.

A plurality of mounting portions 11 for mounting electrical components such as relays are provided on the outer surface of the ceiling plate 30. Further, the ceiling plate 30 is provided with a plurality of connecting portions 20 for connecting to external fuses, connectors and the like. The leg portions 511 are projected in the directions orthogonal to the ceiling plate 30 at the corners or the vicinity of the corners of the ceiling plate 30 and at positions where they do not interfere with the mounting portion 11 and the connecting portion 20.

Ribs (not shown) are formed at a plurality of locations on the inner surface of the ceiling plate 30, and a plurality of pedestals 513 for mounting the bus bar 40, circuit elements, and the like are formed. The bus bar 40, circuit elements and the like are attached to the corresponding pedestals 513.

FIG. 4 is a perspective view showing an example of a bus bar 40 attached to the electrical connection box 100 according to the first embodiment. Although not shown, at least one end of the bus bar 40 is electrically connected to the connection portion 20, and a relatively high voltage (for example, 300 V or more) is applied to the bus bar 40.
In the electrical connection box 100 according to the first embodiment, the bus bar 40 is composed of a plurality of first pieces 41.

Each first piece 41 is made of a thin plate material of a conductive metal (for example, copper). For example, in the present embodiment, each first piece has a thickness of 0.8 mm, and four first pieces 41 constitute one bus bar 40. The four first pieces 41 are superimposed in the thickness direction, and the edges of each first piece 41 are aligned in the overlapping direction. That is, the four first pieces 41 have the same outer shape in a plan view. Therefore, the thickness of the bus bar 40 is 3.2 mm, which is the thickness of the four first pieces 41.

Each first piece is formed by bending a strip-shaped thin plate material at a plurality of places, and has an inverted U-shaped central portion 41A (bent portion) and a flat collar 41B extending from both ends of the central portion 41A. It consists of. The central portion 41A and the flat collar 41B are integrally formed. Each flat collar 41B is formed with a fixing hole 42 for fixing the first piece 41 (bus bar 40) to the pedestal 513 (fixing target) of the upper case 51. The fixing hole 42 is a through hole that penetrates the first piece 41 in the thickness direction.

FIG. 5 is an explanatory diagram illustrating attachment of the electrical connection box 100 according to the first embodiment to the pedestal 513 of the bus bar 40. As shown in FIG. 5, bolts B are inserted into the fixing holes 42 of the four first pieces 41 and screwed into the screw holes N of the pedestal 513, whereby the four first pieces 41 (busbars) are screwed into the screw holes N of the pedestal 513. 40) is fixed to the pedestal 513.

As described above, since the bus bar 40 of the present embodiment is composed of four first pieces 41, it has a thickness of 3.2 mm and has substantially the same cross-sectional area as a single bus bar made of a plate material having a thickness of 3 mm. Therefore, it can be applied to a high voltage as well as a single bus bar.

The bus bar 40 of the present embodiment is not limited to the above description. The bus bar 40 may consist of a first piece 41 having more than four or less than four, and may have a shape having a bent portion. Further, for example, after superimposing the four first pieces 41, they may be integrated by welding or the like if necessary. Further, conductive grease may be applied between the first pieces 41 to increase the electrical conductivity.

FIG. 6 is an explanatory diagram illustrating a method of manufacturing the bus bar 40 of the electrical connection box 100 according to the first embodiment.
The manufacturer manufactures the bus bar 40 (first piece 41) using a roll of a pre-plated thin copper material. The manufacturer can batch-process the thin copper material by offsetting the bending position by the thickness of the plate material with a progressive mold. A plurality of first pieces 41 are simultaneously generated by punching and bridge-cutting a thin copper material with such a progressive remittance mold and bending the copper material (see FIG. 6A). Then, by cutting into each first piece 41, each first piece 41 is obtained (see FIG. 6B). By superimposing the four first pieces 41 manufactured in this manner so as to be aligned with each other, the bus bar 40 according to the first embodiment can be obtained.

Conventionally, in order to manufacture a bus bar having a thickness of about 3 mm, a thick copper material having a thickness of about 3 mm has been used. In this case, since the plate is a thick plate, the press working of the progressive mold cannot be used, and the monotypic taxon and the transfer press working with the standard length material are used, which increases the processing cost and the yield is low.

On the other hand, in the bus bar 40 according to the present embodiment, a plurality of first pieces 41 made of thin plates having a thickness capable of press working of a progressive remittance mold are superposed so as to have a desired thickness (cross-sectional area). It becomes. That is, in the production of each first piece 41, progressive remittance mold processing using a pre-plated thin copper material is possible, the processing cost can be reduced, and the yield is high. Therefore, it is possible to reduce the manufacturing cost of the bus bar 40 (and the electric junction box 100 using the bus bar 40) according to the first embodiment.

(Embodiment 2)
FIG. 7 is a perspective view showing the bus bar 40A of the electrical connection box 100 according to the second embodiment. In the electrical connection box 100 according to the second embodiment, the bus bar 40A has a positioning unit 433 for positioning the bus bar 40A with respect to the pedestal 513 (fixed object).

The bus bar 40A according to the present embodiment has, for example, three first pieces 41 and a second piece 43 having a shape similar to that of the first piece 41. The three first pieces 41 and the one second piece 43 are overlapped so as to be aligned in the respective thickness directions. When the bus bar 40A is fixed to the pedestal 513, the second piece 43 comes into contact with the pedestal 513. That is, the three first pieces 41 are fixed to the pedestal 513 via the second piece 43.

Both the first piece 41 and the second piece 43 have a thickness of, for example, 0.8 mm. The first piece 41 has the same shape as that of the first embodiment, and detailed description thereof will be omitted.
FIG. 8 is a perspective view showing a second piece 43 of the bus bar 40A according to the second embodiment.
The second piece 43 has a superimposing portion 431 having the same shape as the first piece 41 and superimposing on the three first pieces 41, and a positioning portion 433 provided on both end sides of the superimposing portion 431. ..

The superimposing portion 431 has a flat collar 434 corresponding to the flat collar 41B of the first piece 41, and the flat collar 434 for fixing the second piece 43 (bus bar 40A) to the pedestal 513 of the upper case 51. The fixing holes 432 of the above are formed respectively. The fixing holes 42 of the first piece 41 and the fixing holes 432 of the second piece 43 are provided so that the positions of the fixing holes 42 of the first piece 41 and the fixing holes 432 of the second piece 43 are aligned in the overlapping direction when the first piece 41 and the second piece 43 are overlapped.

Further, a positioning portion 433 extends from the edge of one end of the overlapping portion 431. The positioning portion 433 has a bent plate shape. The positioning portion 433 has a base portion 433A projecting in the direction along the surface of the flat collar 434 at one end of the overlapping portion 431 in which the fixing hole 432 is formed, and a engaging portion bent toward the pedestal 513 at the protruding end of the base portion 433A. It has a joint portion 433B. That is, the positioning portion 433 is provided in the vicinity of the fixing hole 432.

As described above, in the electric connection box 100 according to the second embodiment, since the bus bar 40A has the positioning portion 433, the workability is improved in incorporating the electric connection box 100.
FIG. 9 is an explanatory view illustrating attachment of the electric junction box 100 to the pedestal 513 according to the second embodiment, and FIG. 10 is an X of FIG. 9 in a state where the bus bar 40A is attached to the pedestal 513. -It is a vertical cross-sectional view by X-ray.

The pedestal 513 of the upper case 51 is provided with a recess 514 in advance. The recess 514 has a rectangular opening, and among the inner wall surfaces in the width direction, a step 513A is formed on the inner wall surface that comes into contact with the pull-out prevention portion T described later, and the dimension between the two inner wall surfaces is enlarged. There is.

When the bus bar 40A is attached, the bus bar 40A is temporarily fixed (positioned) by inserting and engaging the positioning portion 433 of the bus bar 40A in the recess 514 of the pedestal 513 of the upper case 51. After that, the bolt B is inserted into the fixing hole 42 of the first piece 41 and the fixing hole 432 of the second piece 43 and screwed into the screw hole N of the pedestal 513. At this time, since the bus bar 40A is temporarily fixed by the positioning portion 433, the fixing holes 42 and the fixing holes 432 do not shift in position, and the fixing work of the bus bar 40A becomes easy.

The engaging portion 433B is provided with a pull-out prevention portion T formed by cutting up the central portion thereof into a rectangular shape. The pull-out prevention portion T is designed so that the base portion 433A side projects outward. Therefore, when the engaging portion 433B is inserted into the recess 514 of the pedestal 513, the disengagement prevention portion T comes into contact with the inner wall surface of the recess 514, and at this time, the base portion 433A side of the disengagement prevention portion T engages with the step 513A. Therefore, the engaging portion 433B is prevented from coming out of the recess 514.

In this way, the engaging portion 433B (second piece 43) can be prevented from coming out of the recess 514, and the bus bar 40A is temporarily fixed. Therefore, a square nut can be adopted as a nut (screw hole N) for the bolt B. Workability is improved when the electric junction box 100 is incorporated.

That is, in order to prevent the bus bar from coming off the pedestal, it was necessary to fix the bus bar to the pedestal using a so-called pierce nut, but this is a laborious task. On the other hand, in the electric junction box 100, since the bus bar 40A can be prevented from being disengaged from the pedestal 513 by the engagement between the engaging portion 433B and the recess 514, it is not necessary to use a pierce nut, which is shown in FIG. As such, a square nut that is easy to work with can be used.

Further, since the positioning portion 433 is provided in the vicinity of the fixing hole 42 and the fixing hole 432, it is possible to further enhance the effect of preventing the fixing hole 42 and the fixing hole 432 from being displaced during the fixing work of the bus bar 40A. can.

Further, the electric junction box 100 according to the second embodiment is made of a thin copper material having a thickness in which the first piece 41 and the second piece 43 can be press-processed by a progressive remittance mold, as in the first embodiment. Therefore, when manufacturing each of the first piece 41 and the second piece 43, it is possible to perform progressive remittance mold processing using a pre-plated thin copper material. In particular, the bending process of the positioning portion 433 and the formation of a fine portion such as the pull-out prevention portion T can be performed collectively and easily by progressive remittance mold processing without increasing a separate process. Therefore, the processing cost can be reduced, the yield can be increased, and the manufacturing cost of the bus bar 40A (and the electric junction box 100) according to the second embodiment can be reduced.

In the above, the case where the positioning portion 433 is provided on both end sides of the superimposing portion 431 has been described, but the present invention is not limited to this, and the positioning portion 433 may be provided on any one end side of the superimposing portion 431.

The same parts as those in the first embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.

(Embodiment 3)
FIG. 11 is a perspective view showing the bus bar 40B of the electrical connection box 100 according to the third embodiment, and FIG. 12 is a partial cross-sectional view taken along the line XII-XII of FIG. In the electrical junction box 100 according to the third embodiment, the bus bar 40B is composed of a plurality of (for example, four) first pieces 41 as in the first embodiment, and the four first pieces 41 are in the thickness direction thereof. It is superimposed so as to be consistent.
For convenience of explanation, in FIGS. 11 and 12, some first pieces 41 are displayed at intervals.

In the bus bar 40B of the third embodiment, each first piece 41 has substantially the same shape as that of the first embodiment, and each first piece 41 has a flat collar 413 corresponding to the flat collar 41B of the first embodiment. , A fixing hole 42 is formed in the flat collar 413. Further, in the third embodiment, each first piece 41 has a position matching portion 411 used for positioning with the other first piece 41.

Position matching portions 411 are provided on rectangular flat collars 413 at both ends of each first piece 41. The position matching portion 411 is not limited to this, and may be formed only on one of the flat collars 413, or may be provided on a portion other than the flat collar 413. The position matching portion 411 is formed, for example, by embossing with a progressive remittance mold. That is, the position matching portion 411 is a concave portion (or a convex portion) formed in the flat collar 413.

As a result, a convex portion related to the position matching portion 411 is formed on one surface of the flat collar 413 of each first piece 41, and a concave portion related to the position matching portion 411 is formed on the other surface on the opposite side to the one surface. .. Therefore, the concave portion of the position matching portion 411 of the first piece 41 engages with the convex portion of the position matching portion 411 of the other first piece 41, and the convex portion of the position matching portion 411 of the first piece 41. Engages with the recess of the position matching portion 411 of the other first piece 41. Therefore, the misalignment of the first pieces 41 can be prevented, and the positions of all the first pieces 41 can be aligned in the overlapping direction.

As described above, in the bus bar 40B of the electrical connection box 100 according to the third embodiment, the first pieces 41 are fixed to each other by the position matching portion 411, and the entire first piece 41 is integrated. Therefore, the handleability of the bus bar 40B is improved, and the workability is improved when the electric junction box 100 is incorporated.

The same parts as those in the first or second embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.

(Embodiment 4)
FIG. 13 is a perspective view showing the bus bar 40C of the electrical connection box 100 according to the fourth embodiment. In the electrical connection box 100 according to the fourth embodiment, the bus bar 40C has a plurality of (for example, three) first pieces 41 and a third piece 44, which will be described later and has a shape similar to that of the first piece 41. The three first pieces 41 and the one third piece 44 are overlapped so as to be aligned in each thickness direction. When the bus bar 40C is fixed to the pedestal 513, the third piece 44 comes into contact with the pedestal 513. That is, the three first pieces 41 are fixed to the pedestal 513 via the third piece 44.

FIG. 14 is a perspective view showing a third piece 44 of the bus bar 40C of the electrical connection box 100 according to the fourth embodiment. Further, in FIG. 14, for convenience of explanation, a plurality of first pieces 41 are partially shown by virtual lines. Note that FIG. 14 shows a state in which the plurality of first piece 41 and the third piece 44 are not integrated, which will be described later.

Both the first piece 41 and the third piece 44 have a thickness of, for example, 0.8 mm. The first piece 41 has substantially the same shape as that of the first embodiment.
The third piece 44 has the same character shape as the first piece 41 and is superposed on the three first pieces 41. It has a chemical engagement portion 443. The integrated engaging portion 443 integrates the third piece 44 and the plurality of first pieces 41.

The superimposing portion 441 has substantially the same shape as the first piece 41, and has flat collars 444 corresponding to the flat collars 41B of the first piece 41 of the first embodiment at both ends. Each flat collar 444 is formed with a fixing hole 442 for fixing the third piece 44 (bus bar 40C) to the pedestal 513 of the upper case 51. The fixing holes 42 of the first piece 41 and the fixing holes 442 of the third piece 44 are provided so that their positions are aligned in the overlapping direction when the first piece 41 and the third piece 44 are superposed.

Further, integrated engaging portions 443 are provided on the edges of both ends of the overlapping portion 441. The integrated engaging portion 443 has a bent rectangular plate shape. The integrated engaging portion 443 extends from the edge of the rectangular flat collar 444 of the overlapping portion 441 in which the fixing hole 442 is formed. Further, the end portion of the integrated engaging portion 443 is bent in the thickness direction of the flat collar 444, and the integrated engaging portion 443 has an L-shape in cross section as a whole. That is, the integrated engaging portion 443 has an engaging portion 443A extending in the direction along the surface of the flat collar 444, and a pressing portion 443B bent in the thickness direction of the flat collar 444 at the tip of the engaging portion 443A.

As described above, each first piece 41 has substantially the same shape as that of the first embodiment, but differs in the shapes of both ends.
In the electrical connection box 100 according to the fourth embodiment, engaging recesses 412 having a width corresponding to the integrated engaging portion 443 (engaging portion 443A) of the third piece 44 are provided at both ends of each first piece 41. It is formed.

In each first piece 41, an engaging recess 412 is provided at a position where the rectangular flat collar 413A in which the fixing hole 42 is formed is aligned with the integrated engaging portion 443 of the third piece 44 in the overlapping direction. It is provided. The engaging recess 412 is formed by cutting out the edge of the flat collar 413A in a rectangular shape. In the direction along the side of the flat collar 413A, the dimension of the engaging recess 412 is substantially the same as the width dimension of the engaging portion 443A of the integrated engaging portion 443. 443A engages with the engaging recess 412 of each first piece 41.
Further, at the time of integration, the dimensions of the engaging portion 443A of the integrated engaging portion 443 in the overlapping direction are substantially the same as the sum of the thicknesses of the three first pieces 41.

Hereinafter, the integration of the three first pieces 41 and the one third piece 44 will be described.
As shown in FIG. 14, the three first pieces 41 and the one third piece 44 are superimposed so as to be aligned. That is, the three first pieces 41 are superposed on the third piece 44. At this time, as shown in FIG. 14, the integrated engaging portion 443 is in a state in which the engaging portion 443A extends in the direction along the surface of the flat collar 444.

Next, the integrated engaging portion 443 (engaging portion 443A) is bent toward the first piece 41 (engaging recess 412) (in the direction of the arrow in FIG. 14), and the engaging portion 443A and each first piece 41 are engaged. Engage with recess 412. At this time, the pressing portion 443B of the integrated engaging portion 443 abuts on the outer surface of the flat collar 413A of the first piece 41 farthest from the third piece 44, and presses the flat collar 413A toward the third piece 44 side. do.

As a result, the three first pieces 41 are sandwiched by the flat collar 444 of the third piece 44 and the pressing portion 443B of the integrated engaging portion 443. Further, since the engaging portion 443A of the integrated engaging portion 443 engages with the engaging recess 412 of each first piece 41, the first piece 41 is prevented from being displaced in the direction intersecting the overlapping direction. Therefore, the three first pieces 41 and the one third piece 44 are integrated.

As described above, in the bus bar 40C of the electrical connection box 100 according to the fourth embodiment, the three first pieces 41 and the first third piece 44 are integrated as a whole. Therefore, the handleability of the bus bar 40C is improved, and the workability is improved when the electric junction box 100 is incorporated.

Further, the bus bar 40C is made of a thin copper material having a thickness in which the first piece 41 and the third piece 44 can be press-processed by a progressive remittance mold. Therefore, when manufacturing each of the first piece 41 and the third piece 44, it is possible to perform progressive remittance mold processing using a pre-plated thin copper material. In particular, even in the formation of a fine portion such as the integrated engaging portion 443, the progressive mold processing can be performed collectively and easily without increasing the number of separate steps. Therefore, the processing cost can be reduced, the yield can be increased, and the manufacturing cost of the bus bar 40C (and the electric junction box 100) according to the fourth embodiment can be reduced.
Since the third piece 44 is made of a thin copper material, it is possible to easily bend the integrated engaging portion 443 during the above-mentioned integration operation.

The same parts as those in the first to third embodiments are designated by the same reference numerals, and detailed description thereof will be omitted.

(Embodiment 5)
FIG. 15 is a perspective view showing the bus bar 40D of the electrical connection box 100 according to the fifth embodiment. In the electrical connection box 100 according to the fifth embodiment, the bus bar 40D has a plurality of (for example, three) first piece 41 and a fourth piece 45 described later. The three first pieces 41 and the one fourth piece 45 are overlapped so as to be aligned in the respective thickness directions. When the bus bar 40D is fixed to the pedestal 513, the fourth piece 45 is arranged at the position farthest from the pedestal 513.

The electrical junction box 100 according to the fifth embodiment includes a cooling medium C for cooling the heat generated from the bus bar 40D, and the cooling medium C is held by the holding portion 456 of the fourth piece 45.
The cooling medium C is filled with, for example, water, oil, or the like. The present invention is not limited to this, and the cooling medium C may have a structure in which a flow path for water, oil, or the like is formed inside the cooling medium C, or such a flow path may be connected to the outside. ..

FIG. 16 is a perspective view showing a fourth piece 45 of the bus bar 40D of the electrical connection box 100 according to the fifth embodiment. Further, FIG. 16 shows a state in which the cooling medium C is removed for convenience of explanation, and shows a state in which the engagement mechanism described later is released.

Both the first piece 41 and the fourth piece 45 have a thickness of, for example, 0.8 mm. The first piece 41 has the same shape as that of the first embodiment, and detailed description thereof will be omitted.
The fourth piece 45 has the same shape as the first piece 41 and is provided with a superimposing portion 451 that is superposed on the three first pieces 41 and a cooling medium provided at the edge of the central portion of the superimposing portion 451. It has a holding portion 456 of C.

The overlapping portion 451 has the same shape as the first piece 41, and fixing holes 452 for fixing the fourth piece 45 (bus bar 40D) to the pedestal 513 of the upper case 51 are formed at both ends. The fixing holes 42 of the first piece 41 and the fixing holes 452 of the fourth piece 45 are provided so that their positions are aligned in the overlapping direction when the first piece 41 and the fourth piece 45 are superposed.

Further, the superimposing portion 451 has a rectangular flat portion 453 at the center, and a holding portion 456 extends to a pair of peripheral edges of the flat portion 453. The holding portion 456 includes a first constituent portion 454 provided on one edge of the flat portion 453 and a second constituent portion 455 provided on the other edge.

The first component 454 has a substantially rectangular plate shape that is bent so as to form an L shape in a cross-sectional view in the overlapping direction. The first component 454 extends from one edge of the flat portion 453 in a direction intersecting the flat portion 453 and away from the first piece 41, and bends in the middle so as to be parallel to the flat portion 453. (See FIG. 15). The first component 454 has an engagement notch 454A formed at the center of the edge on the distal end side. The engagement notch 454A is an inverted trapezoid. The engaging notch 454A engages with the engaging convex portion 455A of the second component 455, which will be described later.

The second component 455 has a substantially rectangular plate shape that is bent so as to form an L shape in a cross-sectional view in the overlapping direction. The second component 455 extends from the other edge of the flat portion 453 in a direction intersecting the flat portion 453 and away from the first piece 41, and bends in the middle so as to be parallel to the flat portion 453. (See FIG. 15). The second constituent portion 455 has an engaging convex portion 455A extending at the center of the edge on the distal end side, which corresponds to the engaging notch 454A of the first constituent portion 454. The engaging convex portion 455A is an inverted trapezoid that imitates the engaging notch 454A, and projects in a direction along the surface of the second constituent portion 455. The width dimension of the engaging convex portion 455A becomes larger as it is closer to the protruding tip.

The engagement notch 454A and the engagement protrusion 455A serve as the engagement mechanism of the holding portion 456. That is, the cooling medium C can be held by engaging the engaging notch 454A of the first component 454 and the engaging convex portion 455A of the second component 455.

Hereinafter, a method of holding the cooling medium C in the electrical junction box 100 according to the fifth embodiment will be described.
When the bus bar 40D is fixed to the pedestal 513, the three first piece 41 and the fourth piece 45 are superposed so that the fourth piece 45 is arranged at the position farthest from the pedestal 513 (see FIG. 15). That is, the fourth piece 45 is superimposed on the three first pieces 41.

Next, after the cooling medium C is placed on the outer surface of the flat portion 453 of the fourth piece 45, the first constituent portion 454 and the second constituent portion 455 are bent in the direction in which they approach each other (the direction indicated by the arrow in FIG. 16). Be done. Then, the engaging notch 454A and the engaging convex portion 455A engage with each other. As a result, the cooling medium C is held by the fourth piece 45. In other words, the cooling medium C is sandwiched between the flat portion 453, the first constituent portion 454, and the second constituent portion 455.

Therefore, the heat generated from the bus bar 40D is conducted to the cooling medium C and is rapidly cooled by the cooling medium C. In particular, since the cooling medium C is sandwiched in a state of being surrounded by the flat portion 453, the first constituent portion 454, and the second constituent portion 455, the contact area with the cooling medium C is wide, and heat conduction to the cooling medium C is wide. Is fast.

Further, the electrical connection box 100 according to the fifth embodiment is made of a thin copper material having a thickness in which the first piece 41 and the fourth piece 45 can be pressed by a progressive remittance mold. Therefore, when manufacturing each of the first piece 41 and the fourth piece 45, it is possible to perform progressive remittance mold processing using a pre-plated thin copper material. In particular, even in the formation of a complicated shape portion such as the holding portion 456, the progressive mold processing can be performed collectively and easily without increasing the number of separate steps. Therefore, the processing cost can be reduced, the yield can be increased, and the manufacturing cost of the bus bar 40D (and the electric junction box 100) according to the fifth embodiment can be reduced.
Since the fourth piece 45 is made of a thin copper material, the first component 454 and the second component 455 can be easily bent when holding the cooling medium C described above.

The bus bar 40 according to the first to fifth embodiments may be used as a battery device for a vehicle without being limited to the above description.

The embodiments disclosed this time should be considered as exemplary in all respects and not restrictive. The scope of the present invention is indicated by the scope of claims, not the above-mentioned meaning, and is intended to include all modifications within the meaning and scope equivalent to the scope of claims.

11 Mounting part 20 Connection part 30 Ceiling board 40, 40A, 40B, 40C, 40D Bus bar 41 1st piece
41A Central part 41B Flat brim 42 Fixing hole 43 Second piece
44 Third piece
45 4th piece
50 Housing 100 Electrical junction box 411 Position matching part 412 Engagement recess 413,413A
431, 441, 451 Overlapping part 432 Fixing hole 433 Positioning part 433A Base part 433B Engaging part 434 Flat collar 442 Fixing hole 443 Integrated engaging part 444 Flat collar 452 Fixing hole 454 First component part 454A Engagement notch 455 Component 455A Engagement convex part 456 Holding part 511 Leg part 513 Pedestal (fixed target)
C cooling medium

Claims (7)

It ’s a bus bar for vehicles.
Containing a plurality of first pieces of the same shape made of a conductive plate material,
The plurality of first pieces are superposed bus bars. It includes a superimposing portion having the same shape as the first piece and superimposing on the plurality of first pieces, and a second piece provided on the edge of the superimposing portion and having a positioning portion for positioning with respect to a fixed object. The bus bar according to claim 1. The bus bar according to claim 1 or 2, wherein each first piece has a position matching portion used for alignment with another first piece. A third piece having the same shape as the first piece and having an overlapping portion superimposed on the plurality of first pieces is provided.
The bus bar according to claim 1, wherein the third piece is provided on the edge of the overlapping portion and has an integrated engaging portion for integrating the third piece and the plurality of first pieces. The bus bar according to claim 4, wherein the plurality of first pieces have an engaging recess that engages with the integrated engaging portion of the third piece. A cooling medium that cools the heat generated by at least the first piece,
The bus bar according to any one of claims 1 to 5, further comprising a holding portion for holding the cooling medium. The bus bar according to any one of claims 1 to 6 and
An electrical junction box provided with a connection portion connected to the bus bar and connected to an external terminal.

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