Electrical connection box

Abstract

To provide a technique capable of causing a waterproof resin filled in a flowable state in a penetration hole to stay in the penetration hole until becoming non-flowable.SOLUTION: An electric connection box 10 comprises: one or more bus bars 20; a molding resin part 30 in which the bus bars 20 are molded as insert components; a case 40 that covers the molding resin part 30 to form a waterproof space 12; a closing part 50 that closes a first open part 35 in a penetration hole 34 formed so as to penetrate the molding resin part 30; and a waterproof resin 60 that is filled in the penetration hole 34. The penetration hole 34 is formed so as to expose the whole of peripheries of the inter mediate parts 23 of the bus bars 20 between a first holding part 31 and a second holding part 32. The closing part 50 is a member which is provided separately from the molding resin part 30. The waterproof resin 60 reaches the closing part 50 while covering the whole of the peripheries of the inter mediate parts 23 of the bus bars 20.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present disclosure relates to an electrical connection box.

Background Art

[0002] Patent Document 1 discloses a waterproof structure of a circuit component including a bus bar and a housing in which the bus bar is insert-molded as an insert part. A through hole is formed in the housing. The through hole exposes the middle part of the bus bar over the entire circumference. By filling the through hole with a waterproof adhesive, water intrusion from the gap between the bus bar and the housing into the waterproof space is suppressed.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] The waterproof adhesive is filled in the through hole in a flowable state and then solidifies into a non-flowable state. During this period, it is desired that the waterproof adhesive firmly stays in the through hole.

[0005] Therefore, an object is to provide a technique that can firmly stay in the through hole until the waterproof resin filled in the through hole in a flowable state solidifies into a non-flowable state.

Means for Solving the Problems

[0006] The electrical connection box of the present disclosure includes a bus bar, a molded resin part in which the bus bar is insert-molded as an insert part, a case that covers the molded resin part to form a waterproof space, a closing part that closes the first opening among the first opening and the second opening in a through hole formed to penetrate the molded resin part, and a waterproof resin filled in the through hole. The molded resin part has a first holding part that holds one end of the bus bar and a second holding part that holds the other end of the bus bar while exposing it to the waterproof space. The through hole is formed to expose the entire circumference of the middle part of the bus bar between the first holding part and the second holding part. The closing part is a member provided separately from the molded resin part. The waterproof resin covers the entire circumference of the middle part of the bus bar and reaches the closing part, and it is an electrical connection box.

Effect of the Invention

[0007] According to the present disclosure, the waterproof resin filled in the through hole in a flowable state can firmly stay in the through hole until it hardens and becomes in a non-flowable state.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

DETAILED DESCRIPTION OF THE INVENTION

[0009] [Description of Embodiments of the Present Disclosure] First, embodiments of the present disclosure will be listed and described.

[0010] The electrical connection box of the present disclosure is as follows.

[0011] (1) A bus bar, a molded resin part in which the bus bar is insert-molded as an insert part, a case covering the molded resin part to form a waterproof space, a closing part that closes the first opening among the first opening and the second opening in a through hole formed to penetrate the molded resin part, and a waterproof resin filled in the through hole, wherein the molded resin part has a first holding part that holds one end of the bus bar and a second holding part that holds the other end of the bus bar while exposing it to the waterproof space, the through hole is formed so as to expose the entire circumference of the middle part of the bus bar between the first holding part and the second holding part, the closing part is a member provided separately from the molded resin part, and the waterproof resin is an electrical connection box that covers the entire circumference of the middle part of the bus bar and reaches the closing part. By closing the first opening of the through hole with the closing part, the part of the through hole exhibits a bottomed hole shape with the second opening open and the closing part as the bottom. Thereby, the waterproof resin filled in the through hole from the second opening in a flowable state can firmly stay in the through hole until it hardens and becomes in a non-flowable state.

[0012] (2) In the electrical connection box of (1), the closing part may be provided integrally with the case. Thereby, an increase in the number of parts can be suppressed as compared with the case where the closing part is provided as a member separate from the case.

[0013] (3) In the electrical connection box of (1) or (2), the closing part and the peripheral part of the through hole in the molded resin part may be welded. Thereby, the gap between the closing part and the molded resin part is blocked by the welded part, and it is possible to suppress the leakage of the waterproof resin in a flowable state from the gap between the closing part and the molded resin part.

[0014] (4) In any one of the electrical connection boxes (1) to (3), an annular groove may be formed in one of the closing part and the peripheral part of the through hole in the molded resin part, and an annular convex part that fits into the groove may be provided in the other. Thereby, even when the waterproof resin in a flowable state enters the gap between the closing part and the molded resin part, it is difficult to leak to the outside.

[0015] (5) In any one of the electrical connection boxes (1) to (4), the part of the closing part that becomes the bottom of the through hole may enter the through hole. Thereby, the amount of the waterproof resin used can be reduced.

[0016] [Details of Embodiments of the Present Disclosure] A specific example of the electrical connection box of the present disclosure will be described below with reference to the drawings. Note that the present disclosure is not limited to these examples, and is shown by the claims, and is intended to include all modifications within the meaning and scope equivalent to the claims.

[0017] [Embodiment 1] Hereinafter, the electrical connection box 10 according to Embodiment 1 will be described. FIGS. 1 and 2 are perspective views showing the electrical connection box 10 according to Embodiment 1. FIGS. 1 and 2 are perspective views seen from different viewpoints. FIG. 3 is a plan view showing the electrical connection box 10 according to Embodiment 1. FIG. 4 is a cross-sectional view taken along line IV-IV of FIG. 3. FIGS. 5 and 6 are a plan view and a cross-sectional view showing the electrical connection box 10 before covering the case 40, respectively. FIGS. 7 and 8 are cross-sectional views showing the electrical connection box 10 before filling the waterproof resin 60. Note that FIGS. 6 and 7 are cross-sectional views at the same position as FIG. 4. FIG. 8 is a cross-sectional view at the position along line VIII-VIII of FIG. 3.

[0018] The electrical connection box 10 includes a bus bar 20, a molded resin part 30, a case 40, a closing part 50, and a waterproof resin 60. The electrical connection box 10 is provided with bolts 26, circuit components, and the like.

[0019] The bus bar 20 forms part of the conductive path in the vehicle. For example, the bus bar 20 forms part of the power path connecting the battery in the vehicle and a load such as a motor. The bus bar 20 is made of metal. For example, the bus bar 20 is formed by press working (bending) a metal plate. In this example, two bus bars 20 are provided. One of the two bus bars 20 is an input bus bar 20, and the other is an output bus bar 20. One end portion 21 of each bus bar 20 is provided so as to be connectable to an external circuit. In this example, bolts 26 are provided at one end portion 21 of each bus bar 20. Each bus bar 20 is electrically connected to a mating member (for example, a terminal at the end of an electric wire) via the bolt 26. Each bus bar 20 is formed such that the other end portion 22 is wider than the one end portion 21. The other end portions 22 of the two bus bars 20 are electrically connected to each other via an FET 70. The FET 70 is a switching element that switches the on / off state of the energization between the bus bars 20. The energization state between the two bus bars 20 is controlled via the FET 70.

[0020] The molded resin part 30 is insert molded with the bus bar 20 as an insert part. With the bus bar 20 set at a predetermined position with respect to the mold, resin is injected into the mold to form the molded resin part 30. The molded resin part 30 has a first holding part 31 and a second holding part 32. A through hole 34 is formed in the molded resin part 30.

[0021] The first holding portion 31 holds one end portion 21 of the bus bar 20. One end portions 21 of the two bus bars 20 are arranged side by side in the left - right direction of the drawing of FIG. 5. The first holding portion 31 also holds the bolt 26. The first holding portion 31 holds the bus bar 20 while exposing the upper surface of the bus bar 20. Here, the upper surface of the bus bar 20 is the surface facing upward in the drawing of FIG. 4. While the terminal is in contact with the bus bar 20, the bus bar 20 and the terminal are electrically connected by being screwed through the bolt 26.

[0022] The second holding portion 32 holds the other end portion 22 of the bus bar 20. The second holding portion 32 forms a waterproof space 12 between it and the case 40. The second holding portion 32 exposes the other end portion 22 of the bus bar 20 to the waterproof space 12. The second holding portion 32 holds the bus bar 20 while exposing the upper surface of the bus bar 20. The other end portions 22 of the two bus bars 20 are arranged one above the other in the up - down direction of the drawing of FIG. 5. As shown in FIG. 4, one of the two bus bars 20 is folded back at the portion held by the second holding portion 32. The upper surface of such one bus bar 20 is exposed at a position farther from the first holding portion 31 than the upper surface of the other bus bar 20. In the second holding portion 32, an annular first convex portion 33 is provided at the outer edge portion. The first convex portion 33 is continuously provided so as to go around the periphery of the waterproof space 12.

[0023] The through - hole 34 is formed between the first holding portion 31 and the second holding portion 32. The through - hole 34 penetrates the molded resin portion 30. The molded resin portion 30 is provided with a first opening 35 and a second opening 36 of the through - hole 34. The through - hole 34 is formed so as to expose the entire circumference of the intermediate portion 23 of the bus bar 20. Here, the entire circumference of the intermediate portion 23 of the two bus bars 20 is exposed by one through - hole 34. The axial direction of the through - hole 34 and the extending direction of the intermediate portion 23 of the bus bar 20 intersect (here, are orthogonal). Here, the through - hole 34 penetrates the molded resin portion 30 in the up - down direction in the drawing of FIG. 6. The intermediate portion 23 of the bus bar 20 extends in the left - right direction in the drawing of FIG. 6. The first opening 35 is provided on the upper surface of the molded resin portion 30, and the second opening 36 is provided on the lower surface of the molded resin portion 30.

[0024] The through-hole 34 is formed in a long-hole shape. The through-hole 34 is longer in the width direction of the bus bar 20 than in the extending direction of the bus bar 20. The middle portion 23 of each bus bar 20 extends in the short-side direction of the through-hole 34. The middle portions 23 of the two bus bars 20 are arranged in the long-side direction of the through-hole 34. When observed from the axial direction of the through-hole 34, the middle portions 23 of the two bus bars 20 do not overlap each other. At the position of the through-hole 34, the middle portions 23 of the two bus bars 20 are separated from each other in the width direction. At the position of the through-hole 34, the middle portions 23 of the two bus bars 20 are displaced from each other in the thickness direction.

[0025] In the molded resin portion 30, an annular second convex portion 37 is provided at the peripheral edge of the through-hole 34. The second convex portion 37 is continuously provided so as to surround the through-hole 34. A part of the first convex portion 33 is made common with the second convex portion 37. A portion of the first convex portion 33 between the waterproof space 12 and the through-hole 34 is defined as a common convex portion 33a. The common convex portion 33a is a part of the first convex portion 33 surrounding the waterproof space 12 and also a part of the second convex portion 37 surrounding the through-hole 34.

[0026] The case 40 covers the molded resin portion 30 to form the waterproof space 12. The case 40 is formed in a box shape. The case 40 has a top plate portion 41, a side plate portion 42, and a first flange portion 43. The top plate portion 41 is provided at a distance from the molded resin portion 30. The side plate portion 42 is formed so as to project from the outer edge of the top plate portion 41 toward the molded resin portion 30. The first flange portion 43 is formed so as to project from the tip of the side plate portion 42 toward the outer peripheral side. A first groove portion 44 is formed in the case 40. The first groove portion 44 is formed in the first flange portion 43.

[0027] The side plate portion 42, the first flange portion 43, and the first groove portion 44 are formed in an annular shape. The side plate portion 42, the first flange portion 43, and the first groove portion 44 are continuously provided so as to surround the waterproof space 12. The first convex portion 33 fits into the first groove portion 44. The first convex portion 33 and the first flange portion 43 are welded. The outer surface on the opposite side of the bottom of the first groove portion 44 appears on the first flange portion 43. The outer surface of the first flange portion 43 on the opposite side of the first groove portion 44 is made into a flat surface. This makes it easier for a welding machine (for example, the horn of an ultrasonic welding device) to reach near the welding location.

[0028] The closing portion 50 closes the first opening 35. The closing portion 50 is a member provided separately from the molded resin portion 30. At the time of molding the molded resin portion 30, the closing portion 50 is not provided. Thereby, the portion of the through hole 34 in the molded resin portion 30 can also be molded by the mold being pulled out up and down. Thereby, the molding of the molded resin portion 30 becomes easy. The closing portion 50 has a bottom portion 51 and a second flange portion 53.

[0029] The bottom portion 51 is the portion that becomes the bottom of the through hole 34. In this example, the bottom portion 51 enters the through hole 34. The closing portion 50 has a blind hole 52h on the opposite side of the bottom portion 51. Thereby, an increase in the mass of the closing portion 50 can be suppressed. Also, the heat dissipation property is enhanced by an increase in the surface area of the closing portion 50. When the through hole 34 is observed from the axial direction, the through hole 34 is long in the parallel direction of the bus bars 20. The blind hole 52h is long in the parallel direction of the bus bars 20 because the blind hole 52h has a shape corresponding to the through hole 34.

[0030] The second flange portion 53 is a portion that protrudes laterally from the bottom portion 51. The second flange portion 53 is connected to an inner wall 52 that surrounds the blind hole 52h. The second flange portion 53 is in contact with the molded resin portion 30 at the peripheral edge portion of the through hole 34. The closing portion 50 is fixed to the molded resin portion 30 using the second flange portion 53. A second groove portion 54 is formed in the second flange portion 53.

[0031] The second flange portion 53 and the second groove portion 54 are formed in a ring shape. The second flange portion 53 and the second groove portion 54 are continuously provided so as to go around the periphery of the through hole 34. The second convex portion 37 fits into the second groove portion 54.

[0032] In this example, the closing portion 50 is provided integrally with the case 40. The closing portion 50 and the case 40 are integrally formed by die casting. The first flange portion 43 and the second flange portion 53 of the closing portion 50 and the case 40 are continuous. A part of the first flange portion 43 is made common with the second flange portion 53. A portion of the first flange portion 43 between the waterproof space 12 and the through hole 34 is defined as a common flange portion 43a. A portion of the first groove portion 44 formed in the common flange portion 43a is defined as a common groove portion 44a common with the second groove portion 54. The common convex portion 33a fits into the common groove portion 44a.

[0033] In this example, the closing portion 50 and the peripheral edge portion of the through hole 34 in the molded resin portion 30 are welded. The second convex portion 37 and the second flange portion 53 are welded. The outer surface on the opposite side of the bottom of the second groove portion 54 appears on the second flange portion 53. This makes it easier for a welding machine (for example, the horn of an ultrasonic welding device) to reach near the welding location. The outer surface on the opposite side of the second groove portion 54 of the second flange portion 53 is a flat surface.

[0034] The closing portion 50 is provided with ribs 55. The ribs 55 connect a part of the peripheral edge portion of the bottomed hole 52h to another part. The ribs 55 extend in the short direction so as to connect one long side portion of the bottomed hole 52h to the other long side portion. A plurality (here, two) of ribs 55 are provided at intervals in the long direction of the bottomed hole 52h. By providing the ribs 55, one bottomed hole 52h is divided into a plurality of small bottomed holes.

[0035] The blocking portion 50 is not provided in the second opening 36. The second opening 36 is open. The second opening 36 serves as a pouring port for the waterproof resin 60. The waterproof resin 60 fills the through hole 34. The waterproof resin 60 has insulating properties. The waterproof resin 60 covers the entire circumference of the middle portion 23 of the bus bar 20 and reaches the blocking portion 50. By filling the through hole 34 with the waterproof resin 60, it is possible to prevent water from reaching the waterproof space 12 from the through hole 34.

[0036] More specifically, the bus bar 20 extends through the inner surface of the through hole 34 from the middle portion 23 toward the other end portion 22. The bus bar 20 penetrates the second holding portion 32 between the portion exposed in the waterproof space 12 and the portion exposed in the through hole 34. The bus bar 20 and the molded resin portion 30 are insert-molded so that the molded resin portion 30 surrounds the bus bar 20. However, due to the compatibility between the metal material of the bus bar 20 and the resin material of the molded resin portion 30, the viscosity of the resin material poured into the mold for molding the molded resin portion 30, etc., minute gaps may occur between the bus bar 20 and the molded resin portion 30. Water adhering to the inner surface of the through hole 34 or the bus bar 20, etc., may reach the waterproof space 12 from the through hole 34 through the gap. The waterproof resin 60 suppresses water adhering to the inner surface of the through hole 34 or the bus bar 20, etc., from reaching the waterproof space 12 through the gap between the bus bar 20 and the molded resin portion 30.

[0037] The waterproof resin 60 is injected into the through hole 34 in a flowable state. Thereby, the waterproof resin 60 can spread appropriately along the entire circumference of the bus bar 20 and the inner surface of the through hole 34, etc., inside the through hole 34. The waterproof resin 60 hardens in a state where it has spread appropriately after being injected into the through hole 34. Thereby, the state in which the waterproof resin 60 is injected into the through hole 34 is maintained. The mode of curing the waterproof resin 60 is not particularly limited and can be set as appropriate. For example, the waterproof resin 60 may be a moisture-curing type resin, an ultraviolet-curing type resin, or a two-component mixed-curing type resin. The waterproof resin 60 may be a hot melt adhesive, a room-temperature curing type silicone adhesive, or an elastic epoxy-based adhesive, etc.

[0038] In the waterproof space 12, circuit components are housed. Such circuit components are not particularly limited and can be set as appropriate. The FET 70 is an example of a circuit component. In the example shown in FIG. 5, in addition to the FET 70, a control board 74 and a relay board 77 are provided as circuit components.

[0039] In the example shown in FIG. 5, two FETs 70 are connected in opposite directions to each other with respect to the conduction directions of the two bus bars 20. One FET 70 is mounted on one bus bar 20, and the other FET 70 is mounted on the other bus bar 20. The drain terminal 71 of one FET 70 is connected to one bus bar 20, and the drain terminal 71 of the other FET 70 is connected to the other bus bar 20. The source terminal 72 of one FET 70 and the source terminal 72 of the other FET 70 are connected to a common conductive part (here, the relay board 77).

[0040] The control board 74 includes a first circuit board 75 and control components 76. The control components 76 are mounted on the first circuit board 75. The control components 76 are connected to the gate terminal 73 via the first circuit board 75 and the relay board 77. The control components 76 send an on / off signal to the gate terminal 73. The control board 74 controls the FET 70. In this example, the control board 74 is provided above the bus bar 20. The molded resin part 30 is provided with a support part 39 that supports the first circuit board 75 above the bus bar 20.

[0041] The relay board 77 connects the source terminals 72 of the FETs 70 to each other. The relay board 77 also connects the gate terminal 73 of the FET 70 and the control component 76 of the control board 74. The relay board 77 includes a second circuit board 78 and a relay connector 79. On the second circuit board 78, the source terminals 72 of two FETs 70 are mounted, and a circuit pattern is provided to connect the two mounted source terminals 72 to each other. Also, on the second circuit board 78, the gate terminal 73 of the FET 70 and the relay connector 79 are mounted, and a circuit pattern is provided to connect the mounted gate terminal 73 and the relay connector 79. The first circuit board 75 of the control board 74 and the second circuit board 78 of the relay board 77 are connected via the relay connector 79 and the like.

[0042] The electrical connection box 10 is provided with an external connection connector. The control board 74 is connected to an external control unit such as an electronic control unit (ECU) via the external connection connector. The external connection connector has a connector terminal and a connector housing portion 38. One end of the connector terminal is connected to the first circuit board 75 within the waterproof space 12. The other end of the connector terminal is held by the connector housing portion 38 so as to be connectable to an external connector. In this example, the connector housing portion 38 is provided integrally with the molded resin portion 30. The connector terminal is insert-molded with the molded resin portion 30 having the connector housing portion 38 as an insert part.

[0043] A description will be given of how the electrical connection box 10 according to Embodiment 1 is manufactured with reference to FIGS. 5 to 8.

[0044] First, the bus bar 20 is used as an insert part, and the molded resin part 30 is insert-molded. In addition to the bus bar 20, bolts 26, connector terminals held by the connector housing portion 38, and the like can also be used as insert parts.

[0045] Next, components to be accommodated in the waterproof space 12 are assembled to the molded resin part 30 with the bus bar 20. In this example, the FET 70, the control board 74, the relay board 77, etc. are assembled. For example, after the relay board 77 is assembled, the FET 70 is mounted on the other end portion 22 of the bus bar 20 that is exposed in the waterproof space 12. In the FET 70, the drain terminal 71 is connected to the bus bar 20, and the source terminal 72 and the gate terminal 73 are connected to the relay board 77. The control board 74 is assembled so as to be connected to the relay board 77 and the connector. The first circuit board 75 of the control board 74 and the second circuit board 78 of the relay board 77 are connected via the relay connector 79. Also, one end portion of the connector terminal whose other end portion is exposed to the connector housing portion 38 is connected to the first circuit board 75 of the control board 74.

[0046] Next, as shown in FIGS. 5 and 6, the case 40 is put on the molded resin part 30. Then, the edges of the molded resin part 30 and the case 40 are welded by a welding device such as an ultrasonic welder. The edge surrounding the through hole 34 is welded. Also, the edge surrounding the waterproof space 12 is welded.

[0047] Next, as shown in FIGS. 7 and 8, the waterproof resin 60 in a flowable state is put into the through hole 34. At this time, since the first opening 35 of the through hole 34 is blocked by the blocking portion 50, the waterproof resin 60 is likely to stay in the through hole 34. By the hardening of this waterproof resin 60, the electrical connection box 10 is manufactured.

[0048] <Effects, etc.> According to the electrical connection box 10 configured as described above, when the first opening 35 of the through hole 34 is blocked by the blocking portion 50, the portion of the through hole 34 presents a bottomed hole shape with the second opening 36 open and the blocking portion 50 serving as the bottom. As a result, the waterproof resin 60 filled from the second opening 36 into the through hole 34 in a flowable state can firmly stay in the through hole 34 until it solidifies and becomes non-flowable. Also, since the blocking portion 50 is in contact with the waterproof resin 60, the heat of the bus bar 20 is transmitted to the blocking portion 50 via the waterproof resin 60. Thereby, the heat dissipation performance of the bus bar 20 is also enhanced.

[0049] Further, the blocking portion 50 is provided integrally with the case 40. Thereby, an increase in the number of parts can be suppressed as compared with the case where the blocking portion 50 is provided as a separate member from the case 40.

[0050] Also, the blocking portion 50 and the peripheral edge portion of the through hole 34 in the molded resin portion 30 are welded. Thereby, the gap between the blocking portion 50 and the molded resin portion 30 is blocked by the welded portion, and leakage of the waterproof resin 60 in a flowable state from the gap between the blocking portion 50 and the molded resin portion 30 is suppressed. Generally, in a flowing member, a member with a lower viscosity flows more easily than a member with a higher viscosity and is also more likely to enter a narrow gap or the like. Therefore, from the viewpoint of filling the gap between the bus bar 20 and the molded resin portion 30, it is preferable that the viscosity of the waterproof resin 60 in a flowable state is low. On the other hand, if the gap between the blocking portion 50 and the molded resin portion 30 is not blocked, when the viscosity of the waterproof resin 60 in a flowable state is low, the waterproof resin 60 may enter the gap between the blocking portion 50 and the molded resin portion 30 and leak from the gap. Since the blocking portion 50 and the peripheral edge portion of the through hole 34 in the molded resin portion 30 are welded, even when the viscosity of the waterproof resin 60 in a flowable state is low, leakage of the waterproof resin 60 from the gap between the blocking portion 50 and the molded resin portion 30 is suppressed.

[0051] In this example, when welding the molded resin part 30 and the case 40 (the step of forming the waterproof space), welding of the molded resin part 30 and the closing part 50 (the step of sealing the through hole 34 and the bottom part 51) can also be performed together. Thereby, an increase in the workload due to an increase in the number of steps for sealing the through hole 34 and the bottom part 51 can be suppressed.

[0052] Further, an annular second groove portion 54 is formed in the closing part 50, and a second convex portion 37 that fits into the second groove portion 54 is provided at the peripheral edge of the through hole 34 in the molded resin part 30. Thereby, even when the waterproof resin 60 in a flowable state enters the gap between the closing part 50 and the molded resin part 30, it is less likely to leak to the outside.

[0053] Further, the bottom part 51 that forms the bottom of the through hole 34 in the closing part 50 enters the through hole 34. Thereby, the amount of the waterproof resin 60 used can be reduced. Further, since the distance between the closing part 50 and the bus bar 20 becomes short, the heat of the bus bar 20 easily reaches the closing part 50.

[0054] [Appendix] FIG. 9 is a cross-sectional view showing a modified example of the electrical connection box 10.

[0055] So far, it has been described that the second groove portion 54 is formed in the closing part 50 and the second convex portion 37 is provided in the molded resin part 30, but this is not an essential configuration. For example, the second groove portion 54 and the second convex portion 37 may not be provided. Also, for example, as in the example shown in FIG. 9, an annular groove portion 137 may be formed at the peripheral edge of the through hole 34 in the molded resin part 30, and an annular convex portion 154 that fits into the groove portion 137 may be provided in the closing part 50. An annular groove may be formed in one of the closing part 50 and the peripheral edge of the through hole 34 in the molded resin part 30, and an annular convex portion that fits into the groove may be provided in the other.

[0056] So far, it has been described that the portion that forms the bottom of the through hole 34 in the closing part 50 enters the through hole 34, but this is not an essential configuration. As in the example shown in FIG. 9, the portion that forms the bottom of the through hole 34 in the closing part 50 may not enter the through hole 34.

[0057] Also, although the blocking portion 50 and the molded resin portion 30 have been described as being welded together, this is not an essential configuration. The blocking portion 50 and the molded resin portion 30 may not be welded together. In this case, even when the viscosity of the liquid waterproof resin 60 is low, the liquid waterproof resin 60 is prevented from leaking from the gap between the blocking portion 50 and the molded resin portion 30 by increasing the fitting height of the convex portion and the groove portion or the like.

[0058] In addition, although the blocking portion 50 has been described as being provided integrally with the case 40, this is not an essential configuration. The blocking portion 50 may be provided as a separate member from the case 40. The blocking portion 50 may block the opening on the side opposite to the side covered by the case 40 in the through hole 34. In this case, the opening on the side covered by the blocking portion 50 is the first opening 35.

[0059] Note that the respective configurations described in the above embodiments and respective modifications can be appropriately combined as long as they do not conflict with each other.

Explanation of Reference Numerals

[0060] 10 Electrical connection box 12 Waterproof space 20 Bus bar 21 One end portion 22 The other end portion 23 Intermediate portion 26 Bolt 30 Molded resin portion 31 First holding portion 32 Second holding portion 33 First convex portion 33a Common convex portion 34 Through hole 35 First opening 36 Second opening 37 Second convex portion 137 Second groove portion 38 Connector housing portion 39 Support portion 40 Case 41 Top plate portion 42 Side plate part 43 First flange part 43a Common flange part 44 First groove part 44a Common groove part 50 Closing part 51 Bottom part 52 Inner wall 52h Bottomed hole 53 Second flange part 54 Second groove part 154 Second convex part 55 Rib 60 Waterproof resin 70 FET 71 Drain terminal 72 Source terminal 73 Gate terminal 74 Control substrate 75 Circuit board 76 Control component 77 Relay substrate 78 Circuit board 79 Relay connector

Claims

1. A bus bar, A molded resin part in which the bus bar is insert-molded as an insert part, A case that covers the molded resin part to form a waterproof space, A closing part that closes the first opening among the first opening and the second opening in a through hole formed to penetrate the molded resin part, Waterproof resin filled in the through hole, and comprising The molded resin part has a first holding part that holds one end part of the bus bar, and a second holding part that holds the other end part of the bus bar while exposing it to the waterproof space, The through hole is formed so as to expose the entire circumference of the middle part of the bus bar between the first holding part and the second holding part, The closing part is a member provided separately from the molded resin part, The waterproof resin covers the entire circumference of the middle part of the bus bar and reaches the closing part. An electrical connection box in which the closing part and the peripheral edge part of the through hole in the molded resin part are welded.

2. The electrical connection box according to Claim 1, wherein the closing part is provided integrally with the case.

3. The electrical connection box according to Claim 1 or Claim 2, wherein an annular groove is formed in one of the closing part and the peripheral edge part of the through hole in the molded resin part, and an annular convex part that fits into the groove is provided in the other.

4. The electrical connection box according to any one of Claims 1 to 3, wherein a part of the closing part that forms the bottom of the through hole enters the through hole.

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