Electrical junction box

Abstract

To provide an electrical junction box which can improve the heat dissipation inside a metal housing.SOLUTION: In an electrical junction box 1, a relay unit 8 used to relay-connect an electric wire 7 is stored in the inside of a metal housing 2. The relay unit 8 has a relay 14 attached to a resin component 13 stored inside the metal housing 2. The metal housing 2 has a heat dissipation part 38 formed by raising a position opposing the relay 14 toward the relay 14. The heat dissipation part 38 dissipates heat emanating from the relay 14 to the outside of the metal housing 2.SELECTED DRAWING: Figure 2

Description

Technical Field

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

Background Art

[0002] Conventionally, as disclosed in Patent Document 1, an electrical connection box that relays a plurality of shielded electric wires with a relay, a fuse, or the like is well known. The electrical connection box of Patent Document 1 includes a box body having an upper case closed by a cover and a lower case attached to the back surface of the upper case. The lower case has a bus bar for connecting a plurality of shielded electric wires housed in the box body from an electric wire outlet formed in the wall surface of the upper case. The plurality of shielded electric wires are arranged on the upper surface of the upper case, and the terminals at the tips are fixed to the bus bar of the lower case by a fastening structure of bolts and nuts.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, in the case of a shielded electric wire through which a high-voltage current flows, since a relay or a fuse generates heat, the inside of the box body tends to become high temperature. In particular, when the box body is made of metal, heat tends to accumulate inside the box body. Therefore, in this type of electrical connection box, development of a technology capable of improving heat dissipation has been desired.

[0005] An object of the present disclosure is to provide an electrical connection box capable of improving heat dissipation inside a metal housing.

Means for Solving the Problems

[0006] The electrical connection box for solving the above problems has a configuration in which a relay unit used for relay connection of electric wires is housed inside a metal housing. The relay unit has a relay attached to a resin component housed inside the metal housing, and the metal housing has a heat dissipation part formed by raising the position facing the relay toward the relay.

Effect of the Invention

[0007] The present disclosure can improve the heat dissipation inside the metal housing.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Mode for Carrying Out the Invention

[0009] First, embodiments of the present disclosure will be listed and described. [1] The electrical connection box of the present disclosure has a configuration in which a relay unit used for relay connection of electric wires is housed inside a metal housing. The relay unit has a relay attached to a resin component housed inside the metal housing, and the metal housing has a heat dissipation part formed by raising the position facing the relay toward the relay.

[0010] According to this configuration, it is possible to bring a part of the metal housing as close as possible to the relay as a heat dissipation part. Therefore, the heat generated from the relay can be efficiently released to the outside of the metal housing through the heat dissipation part of the metal housing. Thus, it is possible to improve the heat dissipation performance inside the metal housing.

[0011] [2] In the above [1], the tip of the heat dissipation part that receives the heat generated from the relay is formed in a planar shape. According to this configuration, it is possible to receive the heat from the relay on a wide range of planes and dissipate the heat, which further contributes to improving the heat dissipation performance inside the metal housing.

[0012] [3] In the above [1] or [2], the relay unit has a bus bar that is attached to the resin component and used as wiring in the resin component, and the heat dissipation part is formed by raising the metal housing at a position facing the bus bar connected to the relay. According to this configuration, the heat transmitted from the relay to the bus bar can be smoothly released to the outside of the metal housing by the heat dissipation part existing at the position facing the bus bar. Thus, it further contributes to improving the heat dissipation performance inside the metal housing.

[0013] [4] In any one of [1] to [3] above, the relay unit has a bus bar that is attached to the resin component and used as wiring in the resin component. The metal housing has a housing hole that is attached to the resin component and draws out the electric wire of the connector electrically connected to the bus bar to the outside, and a fluid passage portion that is a portion lower than the heat dissipation portion on the bottom surface of the metal housing and serves as a passage for fluid that has entered the inside of the metal housing from the housing hole. According to this configuration, even if fluid enters the inside of the metal housing from the housing hole, the fluid flows through the fluid passage portion, so it is difficult for the fluid to adhere to electronic components such as the bus bar. Further, for example, when a heat dissipation portion is formed at the bottom of the metal housing, it is possible to use a portion other than the raised heat dissipation portion as the fluid passage portion. Therefore, it is possible to effectively utilize the internal shape of the bottom of the metal housing.

[0014] [5] In any one of [1] to [4] above, the metal housing has a discharge hole that discharges the fluid flowing through the fluid passage portion to the outside of the metal housing. According to this configuration, the fluid flowing through the fluid passage portion is discharged to the outside of the metal housing through the discharge hole, so it is possible to further suppress the adhesion of the fluid to electronic components such as the bus bar.

[0015] [Details of Embodiments of the Present Disclosure] Specific examples of the present disclosure will be described below with reference to the drawings. It should be noted that the present invention is not limited to these examples, but is indicated by the claims, and is intended to include all modifications within the meaning and scope equivalent to the claims. In each drawing, for convenience of explanation, a part of the configuration may be exaggerated or simplified. Also, the dimensional ratios of each part may be different from the actual ones.

[0016] (Electrical Connection Box 1) As shown in FIG. 1, the electrical connection box 1 includes a metal housing 2 having noise resistance as the housing of the electrical connection box 1. The metal housing 2 has, for example, a housing body 3 forming the main body portion of the metal housing 2 and an upper cover 4 closing an opening 5 (see FIG. 2 etc.) of the housing body 3. The housing body 3 is made of, for example, aluminum. The housing body 3 is, for example, open at the top.

[0017] The upper cover 4 is formed, for example, in a rectangular plate shape. The upper cover 4 is made of, for example, iron. The upper cover 4 is fixed to the housing body 3 by fastening members 6 such as a plurality of screws at the four corners of the upper cover 4, for example.

[0018] As shown in FIGS. 2 and 3, the electrical connection box 1 houses a relay unit 8 used for the relay connection of the electric wire 7 inside the metal housing 2. Thus, the electrical connection box 1 is a member that relays an electrical component connected to one electric wire 7 (in this example, the first electric wire 9) and an electrical component connected to the other electric wire 7 (in this example, the second electric wire 10). The electric wire 7 is, for example, a high-voltage electric wire. The electrical connection box 1 protects the electrical circuit by cutting off the electrical circuit connected to the electric wire 7 by the relay unit 8 when an overvoltage or overcurrent is applied to the electric wire 7, for example.

[0019] (Relay unit 8) As shown in FIGS. 2 and 3, the relay unit 8 has a relay 14 attached to a resin component 13 housed inside the metal housing 2. The relay 14 is attached and fixed to a relay attachment portion 15 formed at the center position in the width direction (Y-axis direction in FIG. 3) of the resin component 13 on the upper surface of the resin component 13. The relay 14 turns on and off the electrical circuit to be relayed by contacts (not shown) provided inside the relay housing. The relay 14 cuts off the electrical circuit when the electrical circuit to be relayed becomes an overvoltage or overcurrent, for example.

[0020] The resin component 13 is a member for mounting and supporting electronic components mounted on the relay unit 8. The resin component 13 has, for example, a resin component body 16 forming the main body of the resin component 13 and a protective cover 17 for protecting the back surface of the resin component body 16. The relay 14 described above and a connector 18 (see FIG. 3) provided at the tip of the electric wire 7 are attached to the resin component body 16. The resin component body 16 is formed, for example, in a bottomless hollow shape. The protective cover 17 is fixed to the bottom of the resin component body 16 by, for example, screws (not shown). The resin component 13 is fixed to the metal housing 2 (in this example, the housing body 3) by fastening members 19 such as a plurality of screws.

[0021] The connector 18 includes a first connector 21 provided at the tip of the first electric wire 9 and a second connector 22 provided at the tip of the second electric wire 10. The first connector 21 is attached to a first connector attachment portion 23 disposed at one end in the width direction (Y-axis direction in FIG. 3) of the resin component 13 on the upper surface of the resin component 13. The second connector 22 is attached to a second connector attachment portion 24 disposed at the other end in the width direction (Y-axis direction in FIG. 3) of the resin component 13 on the upper surface of the resin component 13.

[0022] The relay unit 8 has a bus bar 26 that is attached to the resin component 13 and used as wiring in the resin component 13. The bus bar 26 is, for example, wiring for flowing a large current. The bus bar 26 is attached and fixed to the back surface of the resin component body 16 by, for example, screws (not shown). In the case of this example, the bus bar 26 includes, for example, a first bus bar 27 that electrically connects the relay 14 and the first connector 21 and a second bus bar 28 that electrically connects the relay 14 and the second connector 22.

[0023] The first electric wire 9 is connected to one terminal of the relay 14 via the first connector 21 and the first bus bar 27. The second electric wire 10 is connected to the other terminal of the relay 14 via the second connector 22 and the second bus bar 28. Thus, the relay unit 8 has an electrical path that, for example, extends from the first electric wire 9 in sequence through the first connector 21, the first bus bar 27, the relay 14, the second bus bar 28, the second connector 22, and the second electric wire 10.

[0024] Note that the relay unit 8 may have a plurality of pairs of electric wires 7. In this case, the relay unit 8 is not limited to having only one relay 14 and may have a plurality of relays 14. The relay unit 8 may have a fuse as a countermeasure against overcurrent in the electric wire 7. That is, the relay unit 8 may have both the relay 14 and the fuse. Also, the number of bus bars 26 may be appropriately changed according to the number of relays 14 and fuses provided in the relay unit 8.

[0025] (Housing hole 30) As shown in FIGS. 1 to 3, the metal housing 2 has a housing hole 30 that is attached to the resin component 13 and draws out the electric wires 7 (the first electric wire 9 and the second electric wire 10) of the connector 18 that is electrically connected to the bus bar 26 to the outside. The housing hole 30 is formed, for example, by notching an end portion in the height direction (the +Z-axis direction in FIG. 1, etc.) of the side wall of the housing body 3. In the case of this example, the housing hole 30 includes, for example, a first housing hole 31 that draws out the first electric wire 9 to the outside of the housing and a second housing hole 32 that draws out the second electric wire 10 to the outside of the housing. The housing hole 30 ventilates the air inside the metal housing 2 in order to suppress the temperature rise inside the metal housing 2.

[0026] (Heat dissipation measures in the resin component 13) As shown in FIGS. 3 and 4, the resin component 13 has heat dissipation holes 34 that dissipate the heat of the relay unit 8 generated when the relay unit 8 is energized. The heat dissipation holes 34 are holes that communicate the internal space region 35 of the resin component 13 to the outside of the resin component 13. The heat dissipation holes 34 have a circumferential protruding wall 36 at the hole periphery arranged on the surface of the resin component 13. The heat dissipation holes 34 are formed in a rectangular shape when viewed from the hole opening direction (Z-axis direction in FIGS. 3 and 4, etc.). The number of heat dissipation holes 34 may be one or plural. In the space region 35, for example, a bus bar 26 and a fuse (not shown) are arranged.

[0027] As shown in FIG. 4, the heat dissipation holes 34 are preferably arranged, for example, at a position close to the relay 14. This is because the relay 14 is likely to become hot, and the heat generated by the relay 14 is efficiently dissipated through the heat dissipation holes 34. In particular, the heat dissipation holes 34 are preferably arranged above the bus bar 26 in the height direction (Z-axis direction in FIG. 4, etc.) of the resin component 13. Note that arranging the heat dissipation holes 34 at a position close to the relay 14 means, for example, arranging the heat dissipation holes 34 right beside the relay mounting portion 15.

[0028] Also, the heat dissipation holes 34 are preferably arranged, for example, at a position close to the housing hole 30. This is because the heat from the heat dissipation holes 34 is efficiently discharged to the outside of the housing through the housing hole 30. Note that arranging the heat dissipation holes 34 at a position close to the housing hole 30 means, for example, arranging the heat dissipation holes 34 at a position closer to the housing hole 30 than the center in the depth direction (X-axis direction in FIG. 4, etc.) of the resin component 13.

[0029] The opening area Sa of the heat dissipation holes 34 (see FIG. 4) is set to a size sufficient for the air with heat to flow, for example. The heat dissipation holes 34 are set to a height having a predetermined distance Ha from the housing hole 30 in the height direction (Z-axis direction in FIG. 4) of the metal housing 2. That is, the heat dissipation holes 34 are arranged at a position lower than the lower end of the hole of the housing hole 30 in the height direction of the metal housing 2. This is to arrange the heat dissipation holes 34 at a position as far as possible from the housing hole 30.

[0030] As shown in FIG. 3, the heat dissipation holes 34 are provided only at positions facing the first bus bar 27 among the first bus bar 27 and the second bus bar 28. In the case of this example, among the first bus bar 27 and the second bus bar 28, the heat dissipation holes 34 are provided only at positions facing the first bus bar 27, but the heat dissipation holes 34 may be provided at positions facing each of the first bus bar 27 and the second bus bar 28. Further, the heat dissipation holes 34 are not limited to being provided only one for each heat dissipation target, and a plurality of them may be provided.

[0031] (Measures for heat dissipation in the metal housing 2) As shown in FIGS. 2 and 3, the metal housing 2 has a heat dissipation portion 38 formed by raising the position facing the relay 14 toward the relay 14. In the case of this example, the heat dissipation portion 38 is formed by raising the metal housing 2 at a position facing the bus bar 26 connected to the relay 14. In the case of this example, the heat dissipation portion 38 is formed at the bottom of the metal housing 2. That is, the heat dissipation portion 38 is disposed directly below the bus bar 26 connected to the relay 14.

[0032] As shown in FIG. 5, the heat dissipation portion 38 has, for example, a tip formed in a planar shape that receives heat generated by the relay 14. In this way, the heat dissipation portion 38 is formed so as to receive heat generated from the relay 14 in a plane. The heat dissipation portion 38 is formed, for example, by bending the bottom of the metal housing 2 (housing body 3). In this way, the heat dissipation portion 38 is formed by raising a part of the bottom of the metal housing 2.

[0033] (Measures against fluid intrusion into the housing) As shown in Fig. 2, the metal housing 2 has a fluid passage portion 40 that serves as a fluid passage on the inner bottom surface of the metal housing 2. In the case of this example, the fluid passage portion 40 is a location on the bottom surface of the metal housing 2 that is lower than the heat dissipation portion 38 and serves as a passage for the fluid that has entered the interior of the metal housing 2 from the housing hole 30. The fluid passage portion 40 refers to, for example, a portion of the bottom surface of the metal housing 2 (housing body 3) where the heat dissipation portion 38 does not exist.

[0034] The metal housing 2 has a discharge hole 41 for discharging the fluid flowing through the fluid passage portion 40 to the outside of the metal housing 2. The discharge hole 41 is formed, for example, at the bottom of the housing body 3. Thus, in the case of this example, the fluid flowing through the fluid passage portion 40 is discharged to the outside of the metal housing 2 through the discharge hole 41 formed in the housing body 3. Note that the number and arrangement position of the discharge holes 41 are not particularly limited.

[0035] Next, the operation of the electrical connection box 1 of this embodiment will be described. (Heat dissipation function) As shown in Fig. 6, when the relay unit 8 of the electrical connection box 1 is energized, the electronic components of the relay unit 8 generate heat and transfer it to the surroundings. In particular, since the relay unit 8 is surrounded by the metal housing 2, heat is likely to be trapped and it is likely to become hot. That is, it is necessary to prevent the electronic components of the relay unit 8 from overheating by improving the heat dissipation performance of the relay unit 8.

[0036] In the case of this example, when the relay unit 8 is energized, heat is generated by the relay 14, resulting in a heat generation path indicated by "A1" in the figure. That is, when an electric current flows through the electric circuit of the relay unit 8, the relay 14, which is the heat generating body of the relay unit 8, generates heat, and as shown by the heat generation path "A1" in the figure, heat is transferred from the relay 14 to the bus bar 26. The heat transferred to the bus bar 26 is transferred to the resin component 13 as shown by the heat generation path "A2" in the figure. Then, the heat transferred to the resin component 13 is transferred to the metal housing 2, specifically, the housing body 3, as shown by the heat generation path "A3" in the figure.

[0037] In this case, at the bottom of the housing main body 3, a heat dissipation part 38 is formed by raising the bottom. Since this heat dissipation part 38 is formed by raising the bottom of the housing main body 3, it is close to the resin part 13. Therefore, the heat transferred to the resin part 13 is efficiently transferred to the housing main body 3. Accordingly, it is possible to efficiently release the heat transferred from the resin part 13 to the metal housing main body 3 for heat dissipation. Thus, high heat dissipation performance of the electrical connection box 1 is ensured.

[0038] (Function of drainage) As shown in FIG. 7, since a housing hole 30 for drawing out the electric wire 7 to the outside of the metal housing 2 is formed in the metal housing 2, there is a possibility that a fluid such as water may enter the inside of the metal housing 2 from this housing hole 30. In this case, since a fluid passage part 40 is provided on the bottom surface of the housing main body 3, it is possible to flow the fluid that has entered the inside of the metal housing 2 into the fluid passage part 40. That is, it is possible to make it difficult for the fluid that has entered from the housing hole 30 to adhere to the relay 14 and the bus bar 26 of the relay unit 8.

[0039] Further, since a discharge hole 41 is formed in the bottom of the housing main body 3, it is possible to discharge the fluid flowing through the fluid passage part 40 to the outside of the housing main body 3 from the discharge hole 41. For this reason, it is possible to make it difficult for the fluid that has entered the inside of the metal housing 2 to stay inside the metal housing 2. Thus, it further contributes to making it difficult for the fluid to reach the relay 14 and the bus bar 26 of the relay unit 8.

[0040] (Effects of the embodiment) According to the configuration of the above embodiment, the following effects can be obtained. (1) The electrical connection box 1 houses a relay unit 8 used for the relay connection of electric wires 7 inside a metal housing 2. The relay unit 8 has a relay 14 attached to a resin component 13 housed inside the metal housing 2. The metal housing 2 has a heat dissipation part 38 formed by raising the position facing the relay 14 toward the relay 14.

[0041] According to this configuration, it is possible to bring a part of the metal housing 2 as close as possible to the relay 14 as the heat dissipation part 38. For this reason, the heat generated from the relay 14 can be efficiently discharged to the outside of the metal housing 2 through the heat dissipation part 38 at the bottom of the metal housing 2. Therefore, the heat dissipation performance inside the metal housing 2 can be improved.

[0042] (2) The heat dissipation part 38 has a tip that receives the heat generated from the relay 14 formed in a planar shape. According to this configuration, it is possible to receive the heat from the relay 14 on a wide range of planes and dissipate the heat, which further contributes to improving the heat dissipation performance inside the metal housing 2.

[0043] (3) The relay unit 8 has a bus bar 26 that is attached to the resin component 13 and used as wiring in the resin component 13. The heat dissipation part 38 is formed by raising the metal housing 2 at a position facing the bus bar 26 connected to the relay 14. According to this configuration, the heat transmitted from the relay 14 to the bus bar 26 can be smoothly discharged to the outside of the metal housing 2 by the heat dissipation part 38 existing at the position facing the bus bar 26. Therefore, it further contributes to improving the heat dissipation performance inside the metal housing 2.

[0044] (4) The metal housing 2 has a housing hole 30 that is attached to the resin component 13 and draws out the electric wire 7 of the connector 18 electrically connected to the bus bar 26 to the outside, and a location on the bottom surface of the metal housing 2 that is lower than the heat dissipation part 38 and serves as a fluid passage for the fluid that has entered the inside of the metal housing 2 from the housing hole 30, namely, a fluid passage part 40. According to this configuration, even if fluid enters the inside of the metal housing 2 from the housing hole 30, since the fluid flows through the fluid passage part 40, it is difficult for the fluid to adhere to electronic components such as the bus bar 26. Also, when the heat dissipation part 38 is formed on the bottom of the metal housing 2, it becomes possible to use the location other than the raised heat dissipation part 38 as the fluid passage part 40. Therefore, the internal shape of the bottom of the metal housing 2 can be effectively utilized.

[0045] (5) The metal housing 2 has a discharge hole 41 that discharges the fluid flowing through the fluid passage part 40 to the outside of the metal housing 2. According to this configuration, since the fluid flowing through the fluid passage part 40 is discharged to the outside of the metal housing 2 from the discharge hole 41, the adhesion of the fluid to electronic components such as the bus bar 26 can be further suppressed.

[0046] (Other Embodiments) Note that this embodiment can be implemented with the following modifications. This embodiment and the following modification examples can be implemented in combination with each other within a technically non - conflicting range.

[0047] · Preferably, a plurality of heat dissipation parts 38 are provided according to, for example, the number of heat - generating components provided in the resin component 13. That is, preferably, the heat dissipation parts 38 are provided to correspond to each of the relay 14 and the fuse provided in the resin component 13.

[0048] · The shape of the heat dissipation part 38 is not limited to a circular shape when viewed from above, and may be changed to, for example, an elliptical shape, a rectangular shape, or a triangular shape. · Preferably, the heat dissipation part 38 is, for example, brought into close contact with the resin component 13. In this case, a higher heat dissipation effect can be obtained.

[0049] · The heat radiating part 38 is not limited to being arranged at a position corresponding to the bus bar 26, and may be provided at a position where the bus bar 26 is not arranged. · The heat radiating part 38 is not limited to being provided at the bottom of the metal housing 2, and may be provided, for example, at the top or side.

[0050] · The tip of the heat radiating part 38 is not limited to a planar shape, and may be, for example, angular. · The number of the heat radiating parts 38 may be one or a plurality. Further, when a plurality of heat radiating parts 38 are provided, at least one of them may be formed in a shape different from the others.

[0051] · The metal housing 2 is not limited to a two-component structure, and may be composed of one component or three or more components. · The material of the metal housing 2 is not particularly limited as long as it is metal.

[0052] · In the space region 35 of the resin component 13, heat generating components other than the bus bar 26 and the fuse may be provided. · The resin component 13 is not limited to a hollow shape having a space region 35 inside, and may be, for example, a simple plate shape by omitting the protective cover 17.

[0053] · The heat radiation holes 34 are not limited to being formed in the upper wall of the resin component 13, and may be formed, for example, in the bottom wall or the side wall. · The heat radiation holes 34 are not limited to those that radiate the heat inside the space region 35 of the resin component 13 to the outside. For example, when the resin component 13 is in a plate shape, that is, when the resin component 13 has no space region 35, the heat radiation holes 34 may be holes that allow the heat on the back side of the resin component 13 to escape to the front side.

[0054] · The heat radiation holes 34 may have a shape in which the protruding wall 36 is omitted. · When a plurality of heat radiation holes 34 are provided, at least one of them may be formed in a shape different from the others.

[0055] · The hole shape of the heat dissipation hole 34 can adopt various shapes such as a slit shape, a round hole shape, an elliptical shape, a square shape, a triangular shape, etc. · When the relay 14 and the fuse are mounted on the relay unit 8, the heat dissipation target of the heat dissipation hole 34 may be not limited to the relay 14 but also the fuse. That is, the heat dissipation hole 34 may be arranged not only at a position close to the electric wire 7 connected to the relay 14 but also at a position close to the electric wire 7 connected to the fuse.

[0056] · When the electrical connection box 1 (relay unit 8) is connected to, for example, a plurality of electrical components, it may have a function of branching the input and relaying it to each electrical component. · Although the present disclosure has been described based on the embodiments, it is understood that the present disclosure is not limited to the embodiments or structures. The present disclosure also includes various modifications and modifications within the equivalent range. In addition, various combinations and forms, and further other combinations and forms including only one element, more than one element, or less than one element thereof, are within the scope and spirit of the present disclosure.

Description of reference numerals

[0057] 1 Electrical connection box 2 Metal housing 3 Housing body 4 Upper cover 5 Opening 6 Fastening member 7 Electric wire 8 Relay unit 9 First electric wire 10 Second electric wire 13 Resin part 14 Relay 15 Relay mounting part 16 Resin part body 17 Protection cover 18 Connector 19 Fastening member 21 First connector 22 Second connector 23 First connector mounting part 24 Second connector mounting part 26 Bus bar 27 First bus bar 28 Second bus bar 30 Housing hole 31 First housing hole 32 Second housing hole 34 Heat dissipation hole 35 Space area 36 Protruding wall 38 Heat dissipation part 40 Fluid passage part 41 Discharge hole Ha Distance Sa Opening area

Claims

1. An electrical connection box in which a relay unit used for relay connection of electric wires is housed inside a metal housing, The relay unit has a relay attached to a resin component housed inside the metal housing, The metal housing has a heat dissipation part formed by raising a position facing the relay toward the relay, the electrical connection box.

2. The heat dissipation part has a tip that receives heat generated from the relay and is formed in a flat shape, the electrical connection box according to claim 1.

3. The relay unit has a bus bar that is attached to the resin component and used as wiring in the resin component, The heat dissipation part is formed by raising the metal housing at a position facing the bus bar connected to the relay, the electrical connection box according to claim 1.

4. The relay unit has a bus bar that is attached to the resin component and used as wiring in the resin component, The metal housing is, A housing hole for drawing out an electric wire of a connector attached to the resin component and electrically connected to the bus bar to the outside, A fluid passage part that is a lower position than the heat dissipation part on the bottom surface of the metal housing and serves as a passage for fluid that has entered the inside of the metal housing from the housing hole, the electrical connection box according to claim 1.

5. The metal housing has a discharge hole for discharging the fluid flowing through the fluid passage part to the outside of the metal housing, the electrical connection box according to claim 4.

Images