Electrical junction box

Abstract

An electrical junction box (1) is provided with a first case (6), a second case (7), and a pair of bus bars (22). The second case (7) is separate from the first case (6), and is integrated with the first case (6) by assembling the first case (6) thereto. The pair of bus bars (22) are accommodated in a hollow part of an annular noise-resistant core (23) and electrically connect the electrical paths. The pair of bus bars (22) are arranged so as to cross over the first case (6) and the second case (7).

Description

Electrical junction box

[0001] The present invention relates to an electrical junction box.

[0002] Conventionally, an electrical junction box that relays electrical paths of electrical components mounted on a vehicle has been well known, as disclosed in Patent Document 1. The electrical junction box is equipped with various electrical elements, such as a relay, a fuse, and a current sensor.

[0003] Japanese Patent Application Laid-Open No. 2023-33995

[0004] In recent years, the cases of electrical junction boxes have tended to become larger due to the increasing currents flowing through them and the increasing number of electrical elements. For this reason, split case structures have been considered to make the cases easier to manufacture and handle. However, with split case structures, there is a risk that the case will separate at the split surface where the split cases are assembled when a bending load is applied to the case. Therefore, ensuring the strength of the split surface has been an issue when split case structures are used.

[0005] An object of the present disclosure is to provide an electrical junction box that can improve the strength of the divided surfaces even when the case has a divided structure.

[0006] An electrical connection box according to one aspect of the present disclosure is configured to be interposed in the middle of an electrical path, and includes a first case, a second case that is separate from the first case and is integrated with the first case by assembling the first case, and a pair of bus bars that are housed in a hollow portion of an annular noise-resistant core and electrically connect the electrical path, and the pair of bus bars are arranged to cross the first case and the second case.

[0007] The present disclosure can improve the strength of the dividing surface even when the case has a divided structure.

[0008] FIG. 1 is a perspective view of an electrical junction box. FIG. 2 is a perspective view of the electrical junction box before the split cases are assembled. FIG. 3 is a partially enlarged perspective view of the first case. FIG. 4 is a partially enlarged perspective view of the second case. FIGS. 5(a) and 5(b) are explanatory diagrams of how the engagement mechanism is locked. FIG. 6 is a perspective view of a structure for supporting split cases with bus bars. FIG. 7 is an exploded perspective view of a structure for supporting split cases with bus bars. FIG. 8 is a perspective view of a holder. FIG. 9 is a cross-sectional view taken along line IX-IX in FIG. 6. FIG. 10 is a perspective view of a bus bar held by a holder. FIG. 11 is a plan view of a bus bar held by a holder. FIG. 12 is a perspective view showing the configuration of a heat sink. FIG. 13 is a schematic view for explaining how the split cases are supported by the bus bars when a bending load is applied.

[0009] First, embodiments of the present disclosure will be described. [1] An electrical junction box according to the present disclosure is configured to be interposed in the middle of an electrical path, and includes a first case, a second case that is separate from the first case and is integrated with the first case by assembling the first case, and a pair of bus bars that are housed in a hollow portion of an annular noise-resistant core and electrically connect the electrical path, the pair of bus bars being arranged to traverse the first case and the second case.

[0010] With this configuration, even if a bending load is applied to a case having a first case and a second case, the bending load can be supported or absorbed by a pair of bus bars arranged across the first case and the second case. As a result, the entire bending load is not directly applied to the dividing surface between the first case and the second case. Therefore, even if the case has a divided structure, the strength of the dividing surface can be improved.

[0011] [2] In the above [1], one of the pair of bus bars is a positive electrode bus bar and the other is a negative electrode bus bar. With this configuration, by using the pair of positive and negative electrode bus bars, it is possible to improve the strength of the dividing surface in a split-structure case.

[0012] [3] In the above [1] or [2], each of the pair of bus bars has a plate-shaped portion, and the plate-shaped portions of the pair of bus bars are arranged to overlap in the thickness direction. With this configuration, the pair of plate-shaped bus bars are arranged to overlap, and therefore the pair of bus bars, which have high bending strength, can support or receive bending loads. This further contributes to ensuring the strength of the dividing surface.

[0013] [4] In any one of [1] to [3] above, the electrical junction box includes an engagement mechanism having a locking piece formed on one of the first case and the second case and a protrusion formed on the other, and the engagement mechanism integrates the first case and the second case by engaging the locking piece with the protrusion. With this configuration, the engagement mechanism is provided at the dividing surface between the first case and the second case, making it possible to firmly assemble the first case and the second case, thereby further contributing to ensuring the strength of the dividing surface.

[0014] [5] In any one of [1] to [4] above, the electrical junction box includes an insulating holder that holds the pair of bus bars. With this configuration, since the bus bars are held by the holder, it is possible to easily position the bus bars and to make them less likely to deviate from their specified positions.

[0015] [6] In any of the above [1] to [5], the electrical junction box includes a heat sink disposed across the first case and the second case to dissipate heat generated in the electrical path. This configuration allows the heat sink to also support or absorb bending loads applied to the cases, further contributing to improving the strength of the dividing surface.

[0016] [Details of the Embodiments of the Present Disclosure] Specific examples of the present disclosure will be described below with reference to the drawings. Note that the present invention is not limited to these examples, but is defined by the claims, and is intended to include all modifications within the meaning and scope equivalent to the claims. In each drawing, for the convenience of explanation, some components may be exaggerated or simplified. Furthermore, the dimensional proportions of each part may differ from the actual ones.

[0017] (Electrical Junction Box 1) As shown in Fig. 1 , the electrical junction box 1 includes a housing 2 to which electrical components of the electrical junction box 1 are attached. The housing 2 includes a case 3 (an upper case in this example) and a lower case 4. The case 3 and the lower case 4 are integrally assembled, for example, by a known attachment structure. Examples of this attachment structure include a claw-fitting structure, a screw-fastening structure, and a bolt-fastening structure. The electrical junction box 1 is interposed in the middle of an electrical path, and thereby performs, for example, coupling, relaying, or branching of the electrical path, or a combination thereof.

[0018] The electrical junction box 1 is used in, for example, a vehicle battery, and is housed inside, for example, a battery pack (not shown). The vehicle may be, for example, an electric vehicle, a plug-in hybrid vehicle, or a fuel cell vehicle.

[0019] (Case 3) As shown in Figure 2, case 3 has a first case 6 and a second case 7 that is assembled to the first case 6. The second case 7 is separate from the first case 6 and is integrated with the first case 6 by assembling the first case 6. In this way, case 3 has a split structure in which the case portion is split. The first case 6 and the second case 7 are assembled together by an engagement mechanism 8 provided between the first case 6 and the second case 7.

[0020] 2 , the engagement mechanism 8 has a first locking portion 10 provided on the first case 6 and a second locking portion 11 provided on the second case 7. A plurality of pairs of the first locking portion 10 and the second locking portion 11 (three pairs including those not shown in the figure in this example) are provided between the first case 6 and the second case 7. The plurality of pairs of the first locking portion 10 and the second locking portion 11 are arranged in a direction (Y-axis direction in FIG. 2 , etc.: hereinafter referred to as the case short-side direction) perpendicular to the direction in which the first case 6 and the second case 7 are lined up (X-axis direction in FIG. 2 , etc.: hereinafter referred to as the case long-side direction) on the contact surface between the first case 6 and the second case 7 during assembly.

[0021] 3 and 4, the engagement mechanism 8 has a locking structure in which a claw portion engages with a mating part. As shown in Fig. 3, the first locking part 10 has a protrusion 13 that protrudes toward the second case 7 and a pair of first case support parts 14 arranged on both sides of the protrusion 13 in the short side direction of the case. Each of the first case support parts 14 has a hole 15 that opens on the rear side of the first case 6, a slit 16 that extends in the height direction of the first case 6 (the Z-axis direction in Fig. 3, etc.) and communicates with the hole 15, and a pair of wall parts 17 arranged on both sides of the slit 16 in the short side direction of the case.

[0022] 4, the second locking portion 11 has a locking piece 18 that engages with the protrusion 13 of the first locking portion 10, and a pair of second case support portions 19 that are arranged on both sides of the locking piece 18 in the case short direction. Each of the second case support portions 19 is formed in a shape that extends in the height direction of the second case 7 (the Z-axis direction in FIG. 4, etc.), and is formed in a substantially T-shape in a plan view.

[0023] (Assembly of first case 6 and second case 7) As shown in Figures 3 and 4, when assembling the first case 6 and the second case 7, the second case side support part 19 is inserted into the hole 15 of the first case side support part 14, and the second case side support part 19 is inserted into the hole 15 along the slit 16 of the first case side support part 14.

[0024] As shown in Fig. 5(a), while the second case support part 19 is being inserted into the hole 15, the locking piece 18 of the second locking part 11 is pushed by the protruding part 13 of the first locking part 10 and bends, thereby continuing the insertion of the second case support part 19 into the hole 15. As shown in Fig. 5(b), when the second case support part 19 is inserted all the way into the hole 15, the protruding part 13 of the first locking part 10 and the locking piece 18 of the second locking part 11 engage with each other.

[0025] (Bus Bars 22) Fig. 6 is a perspective view showing the structure of the inner surface of the case 3. The electrical junction box 1 includes a pair of bus bars 22 that electrically connect electrical paths in the electrical junction box 1. The pair of bus bars 22 are housed in a hollow portion of an annular noise-resistant core 23. The pair of bus bars 22 may be, for example, a pair of a positive electrode bus bar (referred to as a first bus bar 24) and a negative electrode bus bar (referred to as a second bus bar 25). The pair of bus bars 22 have plate-shaped portions, and the plate-shaped portions of the pair of bus bars 22 are arranged to overlap in the thickness direction.

[0026] As shown in FIG. 7 , the first bus bar 24 has a three-dimensional shape. Specifically, the first bus bar 24 has a first piece 28 extending in the arrangement direction of the first case 6 and the second case 7 (the X-axis direction in FIG. 7 ), a second piece 29 bent approximately 90 degrees from the edge of the first piece 28 closer to the second case 7 in the height direction of the case 3, and a third piece 30 bent approximately 90 degrees from the edge (the lower edge in FIG. 7 ) of the second piece 29 to run along the first piece 28. The first piece 28 and the third piece 30 are arranged, for example, on a plane along the component mounting surface of the case 3, specifically, on the XY plane in FIG. 7 . The second piece 29 extends, for example, on a plane along the height direction of the case 3.

[0027] The first bus bar 24 has a plurality of holes 32 through which shafts of fastening portions 31 that secure the first bus bar 24 to the case 3 pass. The holes 32 include a first insertion hole 32a disposed at one end of the first piece 28 and a second insertion hole 32b disposed at the other end of the first piece 28. In the present example, the second insertion hole 32b is disposed in a protruding piece 33 that protrudes laterally from the end of the first piece 28.

[0028] The fastening portion 31 is, for example, a screw. The fastening portion 31 (fastening portion 31a) inserted into the first insertion hole 32a is fastened to the fastened portion 34a of the first case 6, and the fastening portion 31b inserted into the second insertion hole 32b is fastened to the fastened portion 34b of the second case 7. The fastened portions 34a and 34b are, for example, seats having holes into which screws are threaded.

[0029] The second bus bar 25 has a three-dimensional shape. Specifically, the second bus bar 25 has a first piece 35 extending in the arrangement direction of the first case 6 and the second case 7 (the X-axis direction in FIG. 7 ), a second piece 36 bent approximately 90 degrees from the side end of the first piece 35 closer to the first case 6 in the height direction of the case 3, and a third piece 37 bent approximately 90 degrees from the edge (the lower edge in FIG. 7 ) of the second piece 36 to run along the first piece 35. The first piece 35 and the third piece 37 are arranged, for example, in a plane along the component mounting surface of the case 3, specifically, in the XY plane in FIG. 7 . The second piece 36 extends, for example, in a plane along the height direction of the case 3.

[0030] The second bus bar 25 has a plurality of holes 39 through which shafts of fastening portions 38 that secure the second bus bar 25 to the case 3 pass. In this example, the holes 39 include a first insertion hole 39a disposed at one end of the first piece 35 and a second insertion hole 39b disposed at the other end of the first piece 35. In this example, the first insertion hole 39a is disposed in a protruding piece 40 that protrudes laterally from the end of the first piece 35.

[0031] The fastening portions 38 are, for example, screws. The fastening portions 38 are inserted through the first insertion holes 39 a (fastening portions 38 a) and fastened to the fastened portions 34 a of the first case 6, and the fastening portions 38 b (fastening portions 38 b) and fastened to the fastened portions 34 b of the second case 7.

[0032] 7 , the core 23 has an annular core body 42 and a cover member 43 that covers the surface of the core body 42. The core body 42 has a hollow portion, which may be a hole 42a, that surrounds or houses the bus bar 22. The core 23 is, for example, a ferrite core.

[0033] (Holder 46) As shown in Figures 7 and 8, the electrical junction box 1 includes an insulating holder 46 that holds the bus bars 22 and the cores 23. The holder 46 is configured to insulate the pair of bus bars 22 from their surroundings. The holder 46 may be made of an insulating material, such as resin. The holder 46 includes, for example, a main frame 47 extending in the longitudinal direction of the bus bars 22 and an annular frame 48 formed to surround the main frame 47. The main frame 47 is arranged to divide the interior of the annular frame 48 into two sections. The cores 23 are attached to the outer periphery of the annular frame 48. A flange 49 is formed on the edge of the annular frame 48 to prevent the cores 23 from falling out in the insertion direction.

[0034] 9 , the second bus bar 25 is disposed on the upper surface of the main body frame 47 of the holder 46. The first bus bar 24 is disposed on the inner surface of the bottom wall 50 of the annular frame 48 of the holder 46. The first bus bar 24 and the second bus bar 25 are insulated from each other by the main body frame 47 of the holder 46 being interposed between the first bus bar 24 and the second bus bar 25. In this way, the holder 46 insulates the first bus bar 24 and the second bus bar 25.

[0035] 8 and 9 , the holder 46 has a core removal prevention portion 51 that prevents the core 23 from coming out. The core removal prevention portion 51 is, for example, a flexible claw piece. The core removal prevention portion 51 is, for example, disposed on the annular frame 48 on the opposite side from the flange 49. The core 23 is positioned in the holder 46 by having one axial end supported by the flange 49 and the other axial end supported by the core removal prevention portion 51.

[0036] 10 , the holder 46 has first bus bar engaging portions 52 that engage with the first bus bar 24 attached to the holder 46. The first bus bar engaging portions 52 are, for example, flexible claws that position the first bus bar 24. In this example, the first bus bar engaging portions 52 include engaging protrusions 52a that engage with notches 53 formed in the first bus bar 24, and engaging protrusions 52b that engage with the end surfaces of the first bus bar 24. In this way, a pair of first bus bar engaging portions 52 are arranged in the width direction of the holder 46.

[0037] 11 , the holder 46 has second busbar engaging portions 54 that engage with the second busbars 25 attached to the holder 46. The second busbar engaging portions 54 are, for example, flexible tabs that position the second busbars 25. The second busbar engaging portions 54 are formed in a shape that extends from the edge of the annular frame 48 in the longitudinal direction of the holder 46. In this example, a pair of second busbar engaging portions 54 are arranged in the width direction of the holder 46. The second busbar engaging portions 54 engage with cutout portions 55 formed in the second busbars 25, thereby positioning the second busbars 25 in the holder 46.

[0038] 6 and 7 , the pair of bus bars 22 are arranged to cross between the first case 6 and the second case 7. In the present example, the first bus bar 24 is fixed to the first case 6 by fastening portion 31a and to the second case 7 by fastening portion 31b. The second bus bar 25 is fixed to the first case 6 by fastening portion 38a and to the second case 7 by fastening portion 38b.

[0039] 9 , the first bus bar 24 is fixed to the first case 6 by fastening portions 31 a in a state where the first bus bar 24 overlaps with plate-like wiring 57 that forms an electrical path at a portion where the first bus bar 24 is fixed to the first case 6. The plate-like wiring 57 is electrically connected to a relay 58 (see FIG. 6 , etc.) that cuts off the electrical path in the event of an overload. The second bus bar 25 is fixed to the first case 6 by fastening portions 38 b in a state where the second bus bar 25 overlaps with plate-like wiring 59 that forms an electrical path at a portion where the second bus bar 25 is fixed to the second case 7.

[0040] 12 , the electrical junction box 1 includes a heat sink 61 that dissipates heat generated in the electrical paths inside the electrical junction box 1. The heat sink 61 is arranged to cross the first case 6 and the second case 7. The heat sink 61 has a main body piece 62 that crosses the first case 6 and the second case 7, a first attachment piece 63 arranged at one end of the main body piece 62, and a second attachment piece 64 arranged at the other end of the main body piece 62. The heat sink 61 is made of, for example, metal. In this example, the heat sink 61 is attached in contact with the plate-like wiring 65 that is electrically connected to the relay 58, thereby dissipating heat generated in the plate-like wiring 65.

[0041] The heat sink 61 has a first mounting piece 63 fixed to the first case 6 together with the plate-like wiring 65 by a fastening portion 67a. The fastening portion 67a is inserted into an insertion hole 66a formed in the first mounting piece 63 and fastened to a fastened portion 68a of the first case 6. The heat sink 61 has a second mounting piece 64 fixed to the second case 7 by a fastening portion 67b. The fastening portion 67b is inserted into an insertion hole 66b formed in the second mounting piece 64 and fastened to a fastened portion 68b of the second case 7. The fastening portions 67a and 67b are, for example, screws.

[0042] (Operation of the embodiment) Next, the operation of the electrical junction box 1 of this embodiment will be described. As shown in Fig. 13 , the case 3 of the electrical junction box 1 is divided into a first case 6 and a second case 7 in response to an increase in size. When the case 3 has a divided structure, a dividing surface exists between the first case 6 and the second case 7. In this case, for example, if a bending load is applied to the case 3 as indicated by the arrow in Fig. 13 , and the bending load is large, there is a possibility that the first case 6 and the second case 7 will separate into two at the dividing surface.

[0043] In this example, the pair of bus bars 22 attached to the case 3 are arranged to traverse the first case 6 and the second case 7. Therefore, even if a bending load is applied to the first case 6 and the second case 7, the bending load can be supported or received by the pair of bus bars 22. This increases the strength of the case 3 against the bending load, making it possible to make the first case 6 and the second case 7 less likely to separate.

[0044] (Effects of the embodiment) The configuration of the above embodiment provides the following effects. (1) The electrical junction box 1 is interposed in the middle of an electrical path. The electrical junction box 1 includes a first case 6, a second case 7, and a pair of bus bars 22. The second case 7 is separate from the first case 6 and is integrated with the first case 6 by assembling the first case 6. The pair of bus bars 22 are housed in the hollow portion of the annular noise-resistant core 23 and electrically connect the electrical path. The pair of bus bars 22 are arranged to cross the first case 6 and the second case 7.

[0045] With this configuration, even if a bending load is applied to the case 3 having the first case 6 and the second case 7, the bending load can be supported or received by the pair of bus bars 22 arranged to cross the first case 6 and the second case 7. Therefore, not all of the bending load is directly applied to the dividing surface between the first case 6 and the second case 7. Therefore, even if the case 3 has a divided structure, the strength of the dividing surface can be improved.

[0046] (2) One of the pair of bus bars 22 is a positive electrode bus bar and the other is a negative electrode bus bar. With this configuration, by using the pair of positive and negative electrode bus bars, the strength of the dividing surface of the split case 3 can be improved.

[0047] (3) The pair of bus bars 22 are formed in a plate shape and are arranged to overlap in the thickness direction. With this configuration, the pair of plate-shaped bus bars 22 are arranged to overlap, and therefore the pair of bus bars 22, which have high bending strength, can support or receive bending loads. This further contributes to ensuring the strength of the dividing surface.

[0048] (4) The engagement mechanism 8 provided on the electrical junction box 1 has a locking piece 18 formed on one of the first case 6 and the second case 7 and a protrusion 13 formed on the other, and the first case 6 and the second case 7 are integrated by the engagement between the locking piece 18 and the protrusion 13. With this configuration, the engagement mechanism 8 is provided on the dividing surface between the first case 6 and the second case 7, so that the first case 6 and the second case 7 can be firmly assembled, which further contributes to ensuring the strength of the dividing surface.

[0049] (5) The electrical junction box 1 includes an insulating holder 46 that holds the pair of bus bars 22. With this configuration, the bus bars 22 are held by the holder 46, which makes it easier to position the bus bars 22 and makes it less likely for the bus bars 22 to deviate from their specified positions.

[0050] (6) The heat sink 61 is disposed across the first case 6 and the second case 7 to dissipate heat generated in the electrical path. This configuration allows the heat sink 61 to also support or absorb the bending load applied to the case 3, further contributing to improving the strength of the dividing surface.

[0051] (Other Embodiments) This embodiment can be modified as follows: This embodiment and the following modifications can be combined and implemented within the scope of technical compatibility.

[0052] The pair of bus bars 22 does not have to be arranged overlapping each other, but may be arranged side by side in the horizontal direction, for example. The pair of bus bars 22 does not have to be a pair of a positive electrode and a negative electrode, but may be any electrode that transmits and receives electrical signals.

[0053] The bus bar 22 is not limited to a three-dimensional shape and may be, for example, a flat plate. The structure for fixing the bus bar 22 to the case 3 is not limited to a structure using the fastening portions 31 and 38 and may be a structure in which the bus bar 22 is fixed to a locking member or the like provided on the case 3.

[0054] The electrical junction box 1 is not limited to a configuration in which electrical components are disposed inside the case 3, and may have electrical components attached to the surface of the case 3. The housing 2 may be made up of three or more case parts.

[0055] The engagement mechanism 8 may have the first locking portion 10 provided on the second case 7 and the second locking portion 11 provided on the first case 6. The engagement mechanism 8 may have any structure as long as it can assemble the case 3 and the lower case 4 together.

[0056] Examples of electrical components mounted on the electrical junction box 1 include a relay 58, a fuse, and a sensor. The electrical junction box 1 may be configured without the engagement mechanism 8.

[0057] The heat sink 61 may be omitted from the electrical junction box 1. The electrical junction box 1 may be used in other articles, not limited to vehicles. The upper case 3 and lower case 4 in the illustrated embodiment may be referred to as the upper tray and lower tray of the housing 2. The first case 6 and second case 7 may be referred to as the first divided plate-shaped component or first divided tray component, and the second divided plate-shaped component or second divided tray component, respectively. In the non-limiting embodiment shown in Figures 1 to 4, the XY plane may be referred to as the in-plane direction of the first case 6, second case 7, and / or case 3. The Z axis may be referred to as the thickness direction of the first case 6, second case 7, and / or case 3. As shown in Figure 2, each of the first case 6 and second case 7 may have a joint end surface extending in the thickness direction. The joint end surfaces of both cases 6 and 7 correspond to the dividing surface of the case 3 in the illustrated embodiment. As shown in Fig. 2, the joint end surface of the first case 6 and the joint end surface of the second case 7 are complementary. The first locking portion 10 and the second locking portion 11 of the engagement mechanism 8 may be provided on the joint end surfaces of the first case 6 and the second case 7, respectively. The engagement mechanism 8 may be configured to join the first case 6 and the second case 7 at their joint end surfaces by sliding the joint end surface of the first case 6 and the joint end surface of the second case 7 linearly in the thickness direction of the first case 6 and the second case 7 while maintaining the in-plane parallelism of the first case 6 and the second case 7 (e.g., without rotating the first case 6 and the second case 7 relative to each other). The joint end faces of the first case 6 and the second case 7 are joined, and the first insertion holes 32a, 39a, which are the multiple first length positions of the bus bar 22, and the second insertion holes 32b, 39b, which are the multiple second length positions of the bus bar 22, are fastened to the first case 6 and the second case 7, respectively, by multiple fastening parts, thereby obtaining a rigidly assembled case 3.

[0058] 5, the protrusion 13 included in the first locking part 10 and the locking piece 18 included in the second locking part 11 may be referred to as an engaging pair. The protrusion 13 included in the first locking part 10 may provide a first step surface or a first stop surface. The locking piece 18 included in the second locking part 11 may provide a second step surface or a second stop surface that engages with the first step surface or the first stop surface of the first locking part 10, and may be, for example, an elastic hook.

[0059] While the present disclosure has been described with reference to the embodiments, it is understood that the present disclosure is not limited to the embodiments or structures. The present disclosure also encompasses various modifications and modifications within the scope of equivalents. In addition, various combinations and forms, including only one element, more than one element, or less than one element, are also within the scope and spirit of the present disclosure.

[0060] REFERENCE SIGNS LIST 1 Electrical junction box 2 Housing 3 Case 4 Lower case 6 First case 7 Second case 8 Engagement mechanism 10 First locking portion 11 Second locking portion 13 Projection portion 14 First case side support portion 15 Hole 16 Slit 17 Wall portion 18 Locking piece 19 Second case side support portion 22 Bus bar 23 Core 24 First bus bar 25 Second bus bar 28 First piece 29 Second piece 30 Third piece 31 Fastening portion 31a Fastening portion 31b Fastening portion 32 Hole 32a First insertion hole 32b Second insertion hole 33 Projection piece 34a Fastened portion 34b Fastened portion 35 First piece 36 Second piece 37 Third piece 38 Fastening portion 38a Fastening portion 38b Fastening portion 39 Hole 39a First insertion hole 39b Second insertion hole 40 Projecting piece 42 Core body 42a Hole 43 Cover member 46 Holder 47 Body frame 48 Annular frame 49 Flange 50 Bottom wall 51 Core removal prevention portion 52 First bus bar engaging portion 52a Engaging protrusion 52b Engaging protrusion 53 Notch portion 54 Second bus bar engaging portion 55 Notch portion 57 Plate-shaped wiring 58 Relay 59 Plate-shaped wiring 61 Heat sink 62 Body piece 63 First mounting piece 64 Second mounting piece 65 Plate-shaped wiring 66a Insertion hole 66b Insertion hole 67a Fastening portion 67b Fastening portion 68a Fastened portion 68b Fastened portion

Claims

1. An electrical junction box interposed midway along an electrical path, comprising: a first case; a second case that is separate from the first case and is integrated with the first case by assembling the first case; and a pair of bus bars that are housed in the hollow portion of an annular noise-resistant core and electrically connect the electrical path, the pair of bus bars being arranged to cross the first case and the second case.

2. The electrical junction box according to claim 1, wherein one of the pair of bus bars is a positive electrode bus bar and the other is a negative electrode bus bar.

3. The electrical junction box according to claim 1, wherein each of the pair of bus bars has a plate-shaped portion, and the plate-shaped portions of the pair of bus bars are arranged to overlap in the thickness direction.

4. An electrical connection box as described in claim 1, comprising an engagement mechanism having a locking piece formed on one of the first case and the second case and a protrusion formed on the other, the engagement mechanism integrating the first case and the second case by engaging the locking piece with the protrusion.

5. The electrical junction box according to claim 1, further comprising an insulating holder for holding the pair of bus bars.

6. The electrical junction box according to claim 1, further comprising a heat sink disposed across said first case and said second case to dissipate heat generated in said electrical path.

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