WO2022172749A1 - 電気接続箱 - Google Patents
電気接続箱 Download PDFInfo
- Publication number
- WO2022172749A1 WO2022172749A1 PCT/JP2022/002750 JP2022002750W WO2022172749A1 WO 2022172749 A1 WO2022172749 A1 WO 2022172749A1 JP 2022002750 W JP2022002750 W JP 2022002750W WO 2022172749 A1 WO2022172749 A1 WO 2022172749A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- washer
- bus bar
- busbar
- connection box
- bolt
- Prior art date
Links
- 239000000463 material Substances 0.000 claims abstract description 17
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 9
- 229910052802 copper Inorganic materials 0.000 claims description 9
- 239000010949 copper Substances 0.000 claims description 9
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 description 24
- 238000004519 manufacturing process Methods 0.000 description 11
- 238000000034 method Methods 0.000 description 7
- 230000000750 progressive effect Effects 0.000 description 7
- 230000004048 modification Effects 0.000 description 6
- 238000012986 modification Methods 0.000 description 6
- 230000005855 radiation Effects 0.000 description 4
- 238000005452 bending Methods 0.000 description 3
- 238000001816 cooling Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 1
- 238000007723 die pressing method Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 238000004080 punching Methods 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
Images
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G3/00—Installations of electric cables or lines or protective tubing therefor in or on buildings, equivalent structures or vehicles
- H02G3/02—Details
- H02G3/08—Distribution boxes; Connection or junction boxes
- H02G3/16—Distribution boxes; Connection or junction boxes structurally associated with support for line-connecting terminals within the box
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
- B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
- B60R16/023—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for transmission of signals between vehicle parts or subsystems
- B60R16/0238—Electrical distribution centers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B35/00—Screw-bolts; Stay-bolts; Screw-threaded studs; Screws; Set screws
- F16B35/04—Screw-bolts; Stay-bolts; Screw-threaded studs; Screws; Set screws with specially-shaped head or shaft in order to fix the bolt on or in an object
- F16B35/06—Specially-shaped heads
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B37/00—Nuts or like thread-engaging members
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
- F16B43/00—Washers or equivalent devices; Other devices for supporting bolt-heads or nuts
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/02—Arrangements of circuit components or wiring on supporting structure
- H05K7/06—Arrangements of circuit components or wiring on supporting structure on insulating boards, e.g. wiring harnesses
-
- H—ELECTRICITY
- H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
- H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
- H05K7/00—Constructional details common to different types of electric apparatus
- H05K7/20—Modifications to facilitate cooling, ventilating, or heating
Definitions
- TECHNICAL FIELD The present disclosure relates to electrical junction boxes for vehicles with busbars. This application claims priority based on Japanese Application No. 2021-21052 filed on February 12, 2021, and incorporates all the descriptions described in the Japanese Application.
- Patent Document 1 discloses a relay having a contact that can be opened and closed and an excitation coil that switches between opening and closing of the contact.
- a power supply device is disclosed in which a bus bar can be used both as a current path and as a heat radiation path.
- An electrical junction box is an electrical junction box for a vehicle that includes a busbar fixed using a bolt and a nut, the busbar being interposed between the bolt and the busbar.
- a washer made of the same material as
- FIG. 1 is a plan view of an electrical connection box according to Embodiment 1.
- FIG. 1 is a side view of an electrical connection box according to Embodiment 1;
- FIG. FIG. 4 is a bottom view showing a state in which a lower case is removed from the electrical junction box according to Embodiment 1;
- FIG. 2 is a perspective view showing an example of a busbar attached to the electrical connection box according to Embodiment 1; It is a perspective view which shows the state which attached the bus-bar to the base.
- FIG. 5 is an exemplary diagram showing a modification of the electrical junction box according to Embodiment 1;
- FIG. 11 is a perspective view showing a state in which a bus bar is attached to a base in the electrical junction box according to Embodiment 2;
- FIG. 11 is a perspective view showing a state in which a bus bar is attached to a pedestal in the electrical connection box according to Embodiment 3;
- FIG. 12 is a perspective view showing a state in which a busbar is attached to a base in the electrical junction box according to Embodiment 4;
- An electrical junction box is an electrical junction box for a vehicle that includes a busbar fixed using bolts and nuts, and is interposed between the bolt and the busbar. , a washer made of the same material as the bus bar.
- the washer interposed between the bolt and the busbar is made of the same material as the busbar, heat generated from the busbar can be quickly absorbed.
- the thickness of the washer is 1.5 times or more the thickness of the bus bar.
- the thickness of the washer is 1.5 times or more the thickness of the bus bar, a large amount of heat generated from the bus bar can be absorbed and stored.
- the washer is made of copper.
- the washer is made of the same copper as the busbar, the heat generated from the busbar can be quickly absorbed and stored.
- the washer has an uneven surface.
- the surface of the washer has an uneven shape, so a wider surface area can be secured. Therefore, when the heat generated from the busbar and absorbed by the washer is radiated through the surface of the washer, heat radiation efficiency can be enhanced.
- the bolt has an uneven surface.
- the bolt since the bolt has an uneven surface, a wider surface area can be secured. Therefore, when the heat generated from the busbar and absorbed by the bolt is radiated through the surface of the bolt, heat radiation efficiency can be enhanced.
- the nut has an uneven surface.
- the nut since the nut has an uneven surface, a wider surface area can be secured. Therefore, when the heat generated from the busbar and absorbed by the nut is radiated through the surface of the nut, the heat radiation efficiency can be enhanced.
- FIG. 1 is a plan view of the electrical junction box 100 according to Embodiment 1
- FIG. 2 is a side view of the electrical junction box 100 according to Embodiment 1.
- FIG. 1 is a plan view of the electrical junction box 100 according to Embodiment 1
- FIG. 2 is a side view of the electrical junction box 100 according to Embodiment 1.
- the electrical connection box 100 is attached to the outside of an EV (Electric Vehicle) battery pack, for example.
- the electrical connection box 100 includes a housing 50 in which electrical components such as relays are mounted.
- the housing 50 is made of resin, for example, and includes a lower case 52 and an upper case 51 covering the lower case 52 .
- the housing 50 is attached to the battery pack of the EV so that the bottom plate 521 of the lower case 52 faces the battery pack of the EV. At this time, the bottom plate 521 of the lower case 52 faces the outer surface of the battery pack.
- the electrical junction box 100 side is the upper side and the battery pack side is the lower side.
- FIG. 3 is a bottom view of the electrical connection box 100 according to the first embodiment with the lower case 52 removed.
- the upper case 51 has the shape of a housing with one side open, and the bus bar 40, circuit elements, and the like are mounted inside the upper case 51 .
- the upper case 51 has a ceiling plate 30 facing the bottom plate 521 of the lower case 52 .
- Mounting portions 11 for mounting electrical components such as relays are provided at two locations on the outer surface of the ceiling plate 30 .
- the ceiling plate 30 is provided with a plurality of connection portions (not shown) for connection with external fuses, connectors, and the like.
- the upper case 51 is provided with bottomed tubular legs 511 at four locations. More specifically, the legs 511 protrude in a direction perpendicular to the ceiling plate 30 at or near the corners of the ceiling plate 30 and at positions that do not interfere with the mounting portion 11 and the connection portion.
- a through hole 512 is formed in the bottom of each leg 511 .
- the casing 50 (electric junction box 100) can be attached to the battery pack by inserting screws through the through holes 512 of the leg portions 511 and screwing them into the screw holes of the EV battery pack.
- a plurality of ribs (not shown) are formed on the inner surface of the ceiling plate 30, and a plurality of pedestals 513 for mounting the busbars 40, circuit elements and the like are formed.
- the busbars 40, circuit elements, etc. are attached to corresponding pedestals 513. As shown in FIG.
- FIG. 4 is a perspective view showing an example of a busbar 40 attached to the electric connection box 100 according to the first embodiment. 4 shows a state in which bus bar 40 is removed from pedestal 513 for the sake of convenience. Although illustration is omitted, at least one end of the bus bar 40 is electrically connected to the connecting portion or the mounting portion 11, and a relatively high voltage (for example, 300 V or higher) is applied to the bus bar 40.
- a relatively high voltage for example, 300 V or higher
- the busbar 40 is made of a conductive metal (for example, copper) sheet material.
- the thickness of bus bar 40 is 1.5 mm.
- the bus bar 40 is formed by bending a strip-shaped thin plate material at a plurality of points, and is composed of an inverted U-shaped central portion 41 and rectangular flat flanges 43 extending from both ends of the central portion 41 . .
- the central portion 41 and the flat collar 43 are integrally formed.
- a fixing hole 42 for fixing the bus bar 40 to the pedestal 513 of the upper case 51 is formed in each flat flange 43 .
- the fixing hole 42 is a through hole penetrating the flat collar 43 in the thickness direction.
- a square nut 514 is embedded in the pedestal 513 .
- the bus bar 40 is fixed to the base 513 by inserting the bolt 60 through the fixing hole 42 of the bus bar 40 and screwing it into the screw hole 515 of the square nut 514 of the base 513 .
- a washer 70 is interposed between the bolt 60 and the flat flange 43 of the busbar 40 . That is, the bolt 60 has a hexagonal columnar retaining head 61 at one end, and a washer 70 is interposed between the retaining head 61 and the flat collar 43 .
- the washer 70 has a cylindrical shape, and has an inner diameter that is smaller than the diameter of the retaining head 61 of the bolt 60 (dimension between opposing apexes) and larger than the diameter of the cylindrical threaded portion 62 of the bolt 60. there is In addition, washer 70 has a dimension (hereinafter referred to as thickness) L1 in the axial direction that is 1.5 times or more as large as thickness L2 of bus bar 40 . Further, washer 70 is made of the same material as busbar 40 . That is, since the busbar 40 is made of copper in this embodiment, the washer 70 is also made of the same copper material as the busbar 40 .
- the bus bar 40 can be collectively processed by pressing a thin copper plate with a progressive die while offsetting the bending position by the thickness of the plate.
- the bus bar 40 is obtained by punching and bridge-cutting a thin copper plate with such a progressive die and bending it.
- thermal mass means taking heat and storing it.
- FIG. 5 is a perspective view showing a state where the busbar 40 is attached to the pedestal 513.
- the pedestal 513 is indicated by a chain double-dashed line for convenience of explanation.
- the washer 70 is interposed between the bus bar 40 and the retaining head 61 of the bolt 60, and the bus bar 40 is in contact with the washer 70. .
- the washer 70 is made of the same copper as the busbar 40, and the thickness L1 of the washer 70 is 1.5 times or more the thickness L2 of the busbar 40 (see FIG. 4). Desirably, the thickness L1 of washer 70 is 2-5 times the thickness L2 of busbar 40 . This is because if the thickness L1 of the washer 70 is too thick, it may hinder the assembly work and increase the manufacturing cost.
- washer 70 since the washer 70 is made of the same material as the busbar 40, the heat generated in the busbar 40 during the energization is quickly transferred to the washer 70 and absorbed. Moreover, since the thickness L1 of washer 70 is 1.5 times or more the thickness L2 of busbar 40, washer 70 can store a considerable amount of heat from busbar 40. As shown in FIG. Heat absorbed by washer 70 is air cooled through the surface of washer 70 . Part of the heat absorbed by the washer 70 is radiated also through the bolt 60 and square nut 514 that are in contact with the washer 70 .
- the electric connection box 100 there is no need to increase the width or thickness of the bus bar 40 in order to withstand and dissipate the heat generated when electricity is supplied, and there is no need for a separate member that increases the thermal mass. be. Therefore, the heat generated in the busbars 40 can be reduced and dissipated with a simple configuration while suppressing the size of the busbars 40 .
- the size of the bus bar 40 can be suppressed and press working of the progressive die becomes possible, mass production is possible, the processing cost can be suppressed, and the yield is increased. Further, since a separate member for increasing the thermal mass is not required and the number of parts does not increase, the manufacturing cost of the electric connection box 100 can be suppressed.
- the thickness L1 of the washer 70 is 1.5 times or more the thickness L2 of the bus bar 40 has been described as an example, but it is not limited to this.
- the outer diameter of the washer 70 may be widened within a limit that does not protrude from the flat collar 43 .
- the electric junction box 100 uses the square nut 514 as an example, but the square nut 514 is not limited to this. Also good.
- the configuration in which the washer 70 is made larger than a normal washer in order to take heat from the bus bar 40 and store it has been described, but the configuration is not limited to this.
- other members may be made larger.
- a case where the nut is enlarged will be described below as an example.
- FIG. 6 is an exemplary diagram showing a modification of the electrical junction box 100 according to Embodiment 1.
- FIG. FIG. 6 illustrates the busbar 40 in an attached state, and the illustration of the pedestal 513 is omitted for convenience of explanation.
- the bus bar 40 (flat flange 43) is fixed to the pedestal 513 by inserting the bolt 60 through the fixing hole 42 (see FIG. 4) of the bus bar 40 and screwing it with the square nut 514A.
- FIG. 6 shows a case where only one of the flat flanges 43 of the bus bar 40 is inserted with the bolt 60 and screwed with the square nut 514A.
- a washer 70A is interposed between the hexagonal retaining head 61 of the bolt 60 and the flat collar 43.
- the washer 70A is a normal washer, has a ring shape with a thickness substantially equal to that of the busbar 40, and is made of the same material as the busbar 40.
- the electric connection box 100 includes a hexagonal square nut 514A that is larger than a normal nut. It is larger than the size of the main surface of the brim 43 .
- the square nut 514A Since the square nut 514A is in contact with the flat flange 43, it can absorb and store a large amount of heat generated in the busbar 40 when the power is supplied. The heat absorbed by square nut 514A is air-cooled through the surface of square nut 514A.
- the square nut 514A of the electric junction box 100 has a larger volume and a wider surface area than a normal washer. Therefore, the square nut 514A can store a substantial amount of heat from the busbar 40 and can be air-cooled more quickly through the surface.
- FIG. 7 is a perspective view showing a state where the bus bar 40 is attached to the pedestal 513 in the electric connection box 100 according to the second embodiment.
- the pedestal 513 is indicated by a chain double-dashed line for convenience of explanation.
- the bus bar 40 (flat flange 43) is fixed by inserting the bolt 60 through the fixing hole 42 (see FIG. 4) of the bus bar 40 and screwing it with the square nut 514 of the pedestal 513. It is fixed to the pedestal 513 .
- FIG. 7 shows a case where only one of both flat flanges 43 of bus bar 40 is attached to pedestal 513 .
- a washer 70B is interposed between the bolt 60 and the flat flange 43 of the busbar 40 .
- a washer 70B is interposed between the hexagonal retaining head 61 of the bolt 60 and the flat flange 43 .
- the washer 70B has a cylindrical shape, and has an inner diameter smaller than the diameter of the retaining head 61 of the bolt 60 and larger than the diameter of the cylindrical threaded portion 62 . Moreover, in washer 70B, thickness L1 is 1.5 times or more as large as thickness L2 of bus bar 40 . Further, the washer 70B is made of the same material as the busbar 40. As shown in FIG.
- the surface of the washer 70B is knurled, and the surface of the washer 70B has an uneven shape.
- the washer 70B is made of the same material as the busbar 40, so the heat generated by the busbar 40 when energized is quickly transferred to the washer 70B and absorbed. Moreover, since the thickness L1 of washer 70B is 1.5 times or more the thickness L2 of busbar 40, washer 70B can store a considerable amount of heat from busbar 40. As shown in FIG. Heat absorbed by washer 70B is air-cooled through the surface of washer 70B.
- the surface of the washer 70B has an uneven surface, so that the specific surface area of the washer 70B is ensured to be wide, and the area in contact with the air is increased. . Therefore, the washer 70B can more efficiently cool the stored heat (radiate heat).
- the electric connection box 100 it is not necessary to increase the size of the bus bar 40 in order to withstand and dissipate the heat generated when the current is applied, and press working of a progressive die is possible. Since the dimensions of the bus bar 40 can be suppressed to an extent, mass production is possible, processing costs can be suppressed, and the yield is increased. A separate member for increasing the thermal mass is not required, and the number of parts can be reduced, so that the manufacturing cost of the electrical connection box 100 can be suppressed.
- FIG. 8 is a perspective view showing a state in which the bus bar 40 is attached to the pedestal 513 in the electric connection box 100 according to the third embodiment.
- the pedestal 513 is indicated by a chain double-dashed line for convenience of explanation.
- the bus bar 40 (flat flange 43) is fixed by inserting the bolt 60 through the fixing hole 42 (see FIG. 4) of the bus bar 40 and screwing it with the square nut 514B of the base 513. It is fixed to the pedestal 513 .
- FIG. 8 shows a case where only one of both flat flanges 43 of bus bar 40 is attached to pedestal 513 .
- a washer 70 is interposed between the bolt 60 and the flat flange 43 of the busbar 40 . That is, the washer 70 is interposed between the hexagonal retaining head 61 of the bolt 60 and the flat flange 43 .
- the washer 70 has a cylindrical shape and has an inner diameter that is smaller than the retaining head 61 of the bolt 60 and larger than the outer diameter of the cylindrical threaded portion 62 . Further, in washer 70, thickness L1 is 1.5 times or more as large as thickness L2 of bus bar 40. As shown in FIG. Further, washer 70 is made of the same material as busbar 40 .
- the surface of the square nut 514B is knurled, and the surface of the square nut 514B has an uneven shape.
- the washer 70 is made of the same material as the busbar 40, so the heat generated by the busbar 40 when energized is quickly transferred to the washer 70 and absorbed. Moreover, since the thickness L1 of washer 70 is 1.5 times or more the thickness L2 of busbar 40, washer 70 can store a considerable amount of heat from busbar 40. As shown in FIG. Heat absorbed by washer 70 is air cooled through the surface of washer 70 .
- the square nut 514B since the square nut 514B has an uneven surface, a large specific surface area of the square nut 514B is ensured, and the area in contact with the air is increased. ing. Therefore, when part of the heat absorbed by washer 70 is air-cooled through square nut 514B, air-cooling is performed more efficiently.
- the electrical connection box 100 it is not necessary to increase the dimension of the bus bar 40 in order to withstand and dissipate the heat generated when the current is applied, and press working of a progressive die is possible. Since the dimensions of the bus bar 40 can be suppressed to an extent, mass production is possible, processing costs can be suppressed, and the yield is increased. A separate member for increasing the thermal mass is not required, and the number of parts can be reduced, so that the manufacturing cost of the electrical connection box 100 can be suppressed.
- FIG. 9 is a perspective view showing a state in which the bus bar 40 is attached to the pedestal 513 in the electric connection box 100 according to the fourth embodiment.
- the pedestal 513 is indicated by a chain double-dashed line for convenience of explanation.
- the bus bar 40 (flat flange 43) is fixed by inserting the bolt 60A through the fixing hole 42 (see FIG. 4) of the bus bar 40 and screwing it with the square nut 514 of the base 513. It is fixed to the pedestal 513 .
- FIG. 9 shows a case where only one of both flat flanges 43 of bus bar 40 is attached to pedestal 513 .
- a washer 70 is interposed between the bolt 60A and the flat flange 43 of the busbar 40 . That is, the washer 70 is interposed between the hexagonal retaining head 61A of the bolt 60A and the flat collar 43. As shown in FIG.
- the washer 70 has a cylindrical shape, and has an inner diameter smaller than the retaining head 61A of the bolt 60A and larger than the outer diameter of the cylindrical threaded portion 62A. Further, in washer 70, thickness L1 is 1.5 times or more as large as thickness L2 of bus bar 40. As shown in FIG. Further, washer 70 is made of the same material as busbar 40 .
- the surface of the retaining head 61A of the bolt 60A is knurled, and the surface of the retaining head 61A has an uneven shape.
- the washer 70 is made of the same material as the busbar 40, so the heat generated by the busbar 40 when energized is quickly transferred to the washer 70 and absorbed. Moreover, since the thickness L1 of washer 70 is 1.5 times or more the thickness L2 of busbar 40, washer 70 can store a considerable amount of heat from busbar 40. As shown in FIG. Heat absorbed by washer 70 is air cooled through the surface of washer 70 .
- the retaining head 61A of the bolt 60A has an uneven surface, so that the retaining head 61A has a large specific surface area, and the air The area that touches is wider. Therefore, when part of the heat absorbed by the washer 70 is air-cooled through the retainer head 61A, the air-cooling is performed more efficiently.
- the electrical connection box 100 it is not necessary to increase the dimension of the bus bar 40 in order to withstand and dissipate the heat generated when the current is applied, and press working of a progressive die is possible. Since the dimensions of the bus bar 40 can be suppressed to an extent, mass production is possible, processing costs can be suppressed, and the yield is increased. A separate member for increasing the thermal mass is not required, and the number of parts can be reduced, so that the manufacturing cost of the electrical connection box 100 can be suppressed.
- the case where the surface of the washer 70B, the surface of the retaining head 61A of the bolt 60A, or the surface of the square nut 514B is uneven is described. is not limited to The surface of the washer 70B, the surface of the retaining head 61A of the bolt 60A, and the surface of the square nut 514B may all be uneven.
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Connection Or Junction Boxes (AREA)
- Cooling Or The Like Of Electrical Apparatus (AREA)
- Bolts, Nuts, And Washers (AREA)
Abstract
Description
本出願は、2021年2月12日出願の日本出願第2021-21052号に基づく優先権を主張し、前記日本出願に記載された全ての記載内容を援用するものである。
ところで、バスバーに流れる電流値の上昇は電気抵抗による発熱量の増加を招く。これに対しては、バスバーの耐熱性を高めるために、バスバーの幅を広げる手法、若しくは厚みを厚くする手法、又はいわゆるサーマルマス(熱を奪って蓄えること)を上げる別部材を用いる手法が一般に採用されている。
しかしながら、特許文献1に係る電源装置は、このような問題に対して考慮されておらず、解決できない。
本開示によれば、簡単な構成でバスバーの熱を効率的に低減させることができ、かつ低コストで製造できる電気接続箱を提供できる。
最初に本開示の実施態様を列挙して説明する。また、以下に記載する実施形態の少なくとも一部を任意に組み合わせてもよい。
本開示の実施形態に係る電気接続箱を、以下に図面を参照しつつ説明する。なお、本発明はこれらの例示に限定されるものではなく、請求の範囲によって示され、請求の範囲と均等の意味及び範囲内でのすべての変更が含まれることが意図される。
以下においては、バスバーが装着された車両用の電気接続箱を例として本実施形態を説明する。
以下、説明の便宜上、電気接続箱100と電池パックとの対向方向において、電気接続箱100側を上側とし、電池パック側を下側とする。
アッパーケース51は一面が開放された筐体の形状をなしており、アッパーケース51の内側には、バスバー40、回路素子等が取り付けられている。
図示を省略するが、バスバー40の少なくとも一端は、前記接続部又は装着部11に電気的に接続されており、バスバー40には比較的に高い電圧(例えば、300V以上)が印加される。
更に、座金70はバスバー40と同じ材料からなる。即ち、本実施形態ではバスバー40が銅からなるので、座金70もバスバー40と同じ材料の銅からなる。
また、サーマルマスを上げる別部材を用いる場合、部品点数が増えると共に、組立の工程数も増えるので、製造コストが高まる。
望ましくは、座金70の厚みL1は、バスバー40の厚みL2の2-5倍である。座金70の厚みL1が厚すぎる場合、組み立て作業の妨げになるおそれがあるうえ、製造コストが上昇するからである。
なお、座金70によって吸収された熱の一部は、座金70と接触しているボルト60及び四角ナット514を介しても放熱される。
図7は、実施形態2に係る電気接続箱100において、バスバー40を台座513に取り付けた状態を示す斜視図である。図7では、説明の便宜上、台座513を二点鎖線にて示している。
図8は、実施形態3に係る電気接続箱100において、バスバー40を台座513に取り付けた状態を示す斜視図である。図8では、説明の便宜上、台座513を二点鎖線にて示している。
従って、座金70によって吸収された熱の一部が四角ナット514Bを介して空冷される際、より効率的に空冷が行われる。
図9は、実施形態4に係る電気接続箱100において、バスバー40を台座513に取り付けた状態を示す斜視図である。図9では、説明の便宜上、台座513を二点鎖線にて示している。
従って、座金70によって吸収された熱の一部が抜け止め頭部61Aを介して空冷される際、より効率的に空冷が行われる。
30 天井板
40 バスバー
41 中心部
42 固定孔
43 扁平鍔
50 筐体
51 アッパーケース
52 ロウアーケース
60,60A ボルト
61,61A 抜け止め頭部
62,62A ネジ部
70,70A,70B 座金
100 電気接続箱
511 脚部
512 貫通孔
513 台座
514,514A,514B 四角ナット
515 ネジ孔
521 底板
Claims (6)
- ボルト及びナットを用いて固定されたバスバーを備える車両用の電気接続箱であって、
前記ボルトと前記バスバーとの間に介在しており、前記バスバーと同材料からなる座金を備える電気接続箱。 - 前記座金の厚みは前記バスバーの厚みの1.5倍以上である請求項1に記載の電気接続箱。
- 前記座金は銅製である請求項1又は2に記載の電気接続箱。
- 前記座金は表面に凹凸の形状を有する請求項1から3のいずれか一項に記載の電気接続箱。
- 前記ボルトは表面に凹凸の形状を有する請求項1から3のいずれか一項に記載の電気接続箱。
- 前記ナットは表面に凹凸の形状を有する請求項1から3のいずれか一項に記載の電気接続箱。
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Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2011015489A (ja) * | 2009-06-30 | 2011-01-20 | Toyota Motor Corp | ジャンクションブロックおよび自動車 |
JP2012034469A (ja) * | 2010-07-29 | 2012-02-16 | Auto Network Gijutsu Kenkyusho:Kk | バスバー及びボルト締結構造 |
JP2014116194A (ja) * | 2012-12-10 | 2014-06-26 | Toyota Industries Corp | 蓄電モジュール及び二次電池モジュール |
WO2016186022A1 (ja) * | 2015-05-19 | 2016-11-24 | Koa株式会社 | 電流検出装置 |
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JP2011015489A (ja) * | 2009-06-30 | 2011-01-20 | Toyota Motor Corp | ジャンクションブロックおよび自動車 |
JP2012034469A (ja) * | 2010-07-29 | 2012-02-16 | Auto Network Gijutsu Kenkyusho:Kk | バスバー及びボルト締結構造 |
JP2014116194A (ja) * | 2012-12-10 | 2014-06-26 | Toyota Industries Corp | 蓄電モジュール及び二次電池モジュール |
WO2016186022A1 (ja) * | 2015-05-19 | 2016-11-24 | Koa株式会社 | 電流検出装置 |
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