Electrical junction box

Abstract

Provided is an electrical connection box capable of improving heat dissipation inside a metal case. In the electrical connection box (1), a relay unit (8) for relay connection of an electric wire (7) is housed inside a metal case (2). The relay unit (8) has a relay (14) attached to a resin member (13) housed inside a metal case (2). The metal case (2) has a heat dissipation part (38) formed by protruding a position facing the relay (14) toward the relay (14). The heat dissipation section (38) dissipates heat generated from the relay (14) to the outside of the metal case (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 wires using a relay, a fuse, etc. is known. The electrical connection box of Patent Document 1 includes a box body having an upper case closed by a lid and a lower case attached to the back surface of the upper case. The lower case has a bus bar that connects a plurality of shielded wires taken in from a wire outlet formed in the wall surface of the upper case and housed inside the box body. The plurality of shielded wires are arranged on the upper surface of the upper case, and the terminals at the ends are fixed to the bus bar of the lower case by a fastening structure of bolts and nuts.

[0003] Patent Document 1: Japanese Unexamined Patent Application Publication No. 2014-212608. Summary of the Invention Problems to be Solved by the Invention

[0004] However, in the case of a shielded wire through which a high-voltage current flows, the relay and the fuse generate heat, so the inside of the box body tends to become hot. Especially when the box body is made of metal, heat easily accumulates inside the box body. Therefore, in such an electrical connection box, it is desired to develop a technology that can improve heat dissipation.

[0005] An object of the present disclosure is to provide an electrical connection box that can improve heat dissipation inside a metal case. Means for Solving the Problems

[0006] The electrical connection box for solving the above problems has a structure in which a relay unit for relaying and connecting wires is housed inside a metal case. The relay unit has a relay mounted on a resin member, and the resin member is housed inside the metal case. The metal case has a heat dissipation portion formed by raising the position facing the relay toward the relay. Advantages of the Invention

[0007] The present disclosure can improve heat dissipation inside a metal case. Brief Description of the Drawings

[0008] Figure 1 is a perspective view of an electrical connection box according to an embodiment.

[0009] Figure 2 is Figure 1 a sectional view taken along line II-II shown in

[0010] Figure 3 is an exploded perspective view of the electrical connection box.

[0011] Figure 4 Yes Figure 1 The cross-sectional view taken along line IV-IV shown in the figure.

[0012] Figure 5 It is an enlarged perspective view showing the shape of the heat dissipation part.

[0013] Figure 6 It is a partial cross-sectional view for explaining the heat dissipation effect of the heat dissipation part.

[0014] Figure 7 It is a partial cross-sectional view for explaining the function of the discharge hole. Detailed implementation mode

[0015] First, the implementation modes of the present disclosure will be listed and described.

[0016] [1] The electrical connection box of the present disclosure has a structure in which a relay unit for relaying and connecting electric wires is housed inside a metal housing. The relay unit has a relay mounted on a resin member, the resin member is housed inside the metal housing, and the metal housing has a heat dissipation part formed by bulging the position facing the relay toward the relay.

[0017] According to this structure, a part of the metal housing can be used as a heat dissipation part and be as close as possible to the relay. 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. Therefore, the heat dissipation performance inside the metal housing can be improved.

[0018] [2] In the above [1], the top end of the heat dissipation part that receives the heat generated from the relay is formed in a planar shape. According to this structure, heat from the relay can be received and dissipated over a large range of planes, so it further helps to improve the heat dissipation performance inside the metal housing.

[0019] [3] In the above [1] or [2], the relay unit has a bus bar, the bus bar is mounted on the resin member and serves as wiring in the resin member, and the heat dissipation part is formed by bulging the metal housing at a position facing the bus bar connected to the relay. According to this structure, the heat transferred from the relay to the bus bar can be smoothly released to the outside of the metal housing by using the heat dissipation part existing at the position facing the bus bar. Therefore, it further helps to improve the heat dissipation performance inside the metal housing.

[0020] [4] In any one of [1] to [3] above, the relay unit has a bus bar, the bus bar is installed on the resin member and serves as wiring in the resin member, and the metal housing has: a housing hole for leading out the wire of the connector installed on the resin member and electrically connected to the bus bar to the outside; and a fluid passage portion, which is a portion of the bottom surface of the metal housing that is lower than the heat dissipation portion and serves as a passage for the fluid that immerses into the inside of the metal housing from the housing hole. According to this structure, even if the fluid immerses into the inside of the metal housing from the housing hole, since the fluid flows in the fluid passage portion, it is difficult for the fluid to adhere to electronic components such as the bus bar. In addition, for example, when a heat dissipation portion is formed at the bottom of the metal housing, a portion other than the raised heat dissipation portion can be used as the fluid passage portion. Therefore, the internal shape of the bottom of the metal housing can be effectively utilized.

[0021] [5] In any one of [1] to [4] above, the metal housing has a discharge hole for discharging the fluid flowing into the fluid passage portion to the outside of the metal housing. According to this structure, the fluid flowing in the fluid passage portion is discharged to the outside of the metal housing from the discharge hole, so that the adhesion of the fluid to electronic components such as the bus bar can be further suppressed. [Details of the Embodiment of the Present Disclosure]

[0022] Hereinafter, specific examples of the present disclosure will be described with reference to the drawings. It should be noted that the present invention is not limited to these examples, as shown in the claims, and is intended to include all changes within the meaning and scope equivalent to the claims. In each drawing, for the sake of convenience of explanation, sometimes a part of the structure is exaggerated or simplified. In addition, the dimensional ratios of each part are sometimes different from the actual ones. (Electrical Connection Box 1)

[0023] As Figure 1 shown, 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 constituting the main part of the metal housing 2 and an upper cover 4 that closes the opening 5 of the housing body 3 (refer to Figure 2 etc.). The housing body 3 is made of aluminum, for example. The housing body 3 is, for example, open at the upper part.

[0024] The upper cover 4 is formed in a rectangular plate shape, for example. The upper cover 4 is made of iron, for example. The upper cover 4 is fixed to the housing body 3 at the four corners of the upper cover 4 by fastening members 6 such as a plurality of screws, for example.

[0025] As Figure 2 and Figure 3As shown, the electrical connection box 1 houses a relay unit 8 for relay connection of the electric wire 7 inside a metal housing 2. In this way, the electrical connection box 1 is a component that relays between an electrical component connected to one electric wire 7 (the first electric wire 9 in this example) and an electrical component connected to the other electric wire 7 (the second electric wire 10 in this example). The electric wire 7 is, for example, a high-voltage electric wire. The electrical connection box 1, for example, cuts off the circuit connected to the electric wire 7 through the relay unit 8 when an overvoltage or overcurrent is applied to the electric wire 7, thereby protecting the circuit. (Relay unit 8)

[0026] As Figure 2 and Figure 3 shown, the relay unit 8 has a relay 14 mounted on a resin component 13, and the resin component 13 is housed inside the metal housing 2. The relay 14 is mounted and fixed to a relay mounting portion 15, and the relay mounting portion 15 is formed at the center position in the width direction ( Figure 3 the Y-axis direction) of the resin component 13 on the upper surface of the resin component 13. The relay 14 connects and disconnects the relayed circuit through contacts (not shown) provided inside the relay housing. The relay 14, for example, cuts off the circuit when the relayed circuit becomes overvoltage or overcurrent.

[0027] The resin component 13 is a component for mounting and supporting electronic components mounted on the relay unit 8. The resin component 13, for example, has a resin component main body 16 constituting the main body of the resin component 13 and a protective cover 17 for protecting the back surface of the resin component main body 16. The aforementioned relay 14 and a connector 18 provided at the front end of the electric wire 7 (refer to Figure 3 ) are mounted on the resin component main body 16. The resin component main body 16 is, for example, formed in a bottomless hollow shape. The protective cover 17 is fixed to the bottom of the resin component main body 16 by, for example, screws (not shown). The resin component 13 is fixed to the metal housing 2 (the housing main body 3 in this example) by a plurality of fastening members 19 such as screws.

[0028] The connector 18 includes a first connector 21 provided at the end of the first electric wire 9 and a second connector 22 provided at the end of the second electric wire 10. The first connector 21 is mounted on a first connector mounting portion 23, and the first connector mounting portion 23 is arranged at one end in the width direction ( Figure 3 the Y-axis direction) of the resin component 13 on the upper surface of the resin component 13. The second connector 22 is mounted on a second connector mounting portion 24, and the second connector mounting portion 24 is arranged at the other end in the width direction ( Figure 3 the Y-axis direction) of the resin component 13 on the upper surface of the resin component 13.

[0029] The relay unit 8 has a bus bar 26 that is mounted on the resin member 13 and serves as wiring in the resin member 13. The bus bar 26 is, for example, wiring through which a large current flows. The bus bar 26 is mounted and fixed to the back surface of the resin member main 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.

[0030] 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. In this way, the relay unit 8 has, for example, an electrical path that sequentially reaches from the first electric wire 9 to 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.

[0031] In addition, 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 of the electric wire 7. That is, the relay unit 8 may have both the relay 14 and the fuse. In addition, 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. (Housing hole 30)

[0032] As Figures 1 to 3 shown, the metal housing 2 has a housing hole 30 that leads the electric wires 7 (the first electric wire 9 and the second electric wire 10) of the connector 18 that is mounted on the resin member 13 and electrically connected to the bus bar 26 to the outside. The housing hole 30 is formed, for example, by cutting off an end portion in the height direction ( Figure 1 such as the +Z-axis direction) of the side wall of the housing main body 3. In the case of this example, the housing hole 30 includes, for example, a first housing hole 31 that leads the first electric wire 9 to the outside of the housing and a second housing hole 32 that leads 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. (Heat dissipation countermeasure in the resin member 13)

[0033] As Figure 3 and Figure 4 shown, the resin member 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 member 13 with the outside of the resin member 13. The heat dissipation holes 34 have a circumferential protruding wall 36 at the hole periphery disposed on the surface of the resin member 13. From the hole opening direction ( Figure 3, Figure 4 When observed in the Z-axis direction (such as that of etc.), the heat dissipation holes 34 are formed in a rectangular shape. There may be one or more heat dissipation holes 34. In the space region 35, for example, a bus bar 26, a fuse (not shown), etc. are arranged.

[0034] As Figure 4 shown, it is preferable to arrange the heat dissipation holes 34, for example, at a position close to the relay 14. This is because the relay 14 is likely to become hot, so 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 ( Figure 4 such as the Z-axis direction of etc.) of the resin member 13. In addition, arranging the heat dissipation holes 34 at a position close to the relay 14 means, for example, arranging the heat dissipation holes 34 on the front side of the relay mounting portion 15.

[0035] In addition, it is preferable to arrange the heat dissipation holes 34, 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. In addition, arranging the heat dissipation holes 34 at a position close to the housing hole 30 means that, for example, in the depth direction ( Figure 4 such as the X-axis direction of etc.) of the resin member 13, the heat dissipation holes 34 are arranged at a position closer to the housing hole 30 than the center.

[0036] The opening area Sa of the heat dissipation holes 34 (refer to Figure 4 ) is set to a sufficient size required for the flow of air with heat, for example. The heat dissipation holes 34 are set to have a height with a prescribed distance Ha from the housing hole 30 in the height direction ( Figure 4 the Z-axis direction of ) 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 away from the housing hole 30 as possible.

[0037] As Figure 3 shown, 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 addition, in the case of this example, although 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, the heat dissipation holes 34 may also be provided at positions facing the first bus bar 27 and the second bus bar 28 respectively. In addition, the heat dissipation holes 34 are not limited to providing only one for one heat dissipation object, and multiple heat dissipation holes 34 may also be provided. (Heat dissipation countermeasures for the metal housing 2)

[0038] As Figure 2 and Figure 3As shown, the metal housing 2 has a heat dissipation portion 38 formed by bulging the position facing the relay 14 toward the relay 14. In the case of this example, the heat dissipation portion 38 is formed by bulging 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.

[0039] As Figure 5 shown, the top end of the heat dissipation portion 38 that receives the heat generated by the relay 14, for example, is formed in a planar shape. In this way, the heat dissipation portion 38 is formed to receive the 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 main body 3). In this way, the heat dissipation portion 38 is formed by raising a part of the bottom of the metal housing 2. (Measures against fluid intrusion into the housing)

[0040] As Figure 2 shown, the metal housing 2 has a fluid passage portion 40 that serves as a passage for the fluid inside the inner bottom surface of the metal housing 2. In the case of this example, the fluid passage portion 40 is a portion of 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 inside of the metal housing 2 from the housing hole 30. The fluid passage portion 40 is, for example, a portion of the bottom surface of the metal housing 2 (housing main body 3) where the heat dissipation portion 38 does not exist.

[0041] The metal housing 2 has a discharge hole 41 for discharging the fluid flowing into 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 main body 3. In this way, in the case of this example, the fluid flowing in the fluid passage portion 40 is discharged to the outside of the metal housing 2 through the discharge hole 41 formed in the housing main body 3. In addition, the number and arrangement position of the discharge holes 41 are not particularly limited.

[0042] Next, the operation of the electrical connection box 1 of this embodiment will be described. (Heat dissipation function)

[0043] As Figure 6 shown, when the relay unit 8 of the electrical connection box 1 is energized, the electronic components of the relay unit 8 have heat and transfer it to the surroundings. In particular, since the surroundings of the relay unit 8 are covered by the metal housing 2, heat is likely to accumulate and easily become high temperature. That is, it is necessary to improve the heat dissipation performance of the relay unit 8 to prevent the electronic components of the relay unit 8 from overheating.

[0044] In the case of this example, when the relay unit 8 is powered on, the relay 14 generates heat, thereby generating a heat path shown as "A1" in the figure. That is, when current flows through the circuit of the relay unit 8, the relay 14, which is the heating element of the relay unit 8, generates heat, and as shown by the heat path "A1", the heat is transferred from the relay 14 to the bus bar 26. As shown by the heat path "A2" in the figure, the heat transferred to the bus bar 26 is transferred to the resin member 13. And, as shown by the heat path "A3" in the figure, the heat transferred to the resin member 13 is transferred to the metal housing 2, specifically to the housing main body 3.

[0045] In the case of this example, at the bottom of the housing main body 3, a heat dissipation portion 38 is formed by raising the bottom. Since the heat dissipation portion 38 is formed by raising the bottom of the housing main body 3, it is close to the resin member 13. Therefore, the heat transferred to the resin member 13 is efficiently transferred to the housing main body 3. Therefore, the heat transferred from the resin member 13 can be efficiently released and dissipated to the metal housing main body 3. Therefore, the high heat dissipation performance of the electrical connection box 1 is ensured. (Function of draining water)

[0046] As Figure 7 shown, a housing hole 30 for leading the electric wire 7 to the outside of the metal housing 2 is formed in the metal housing 2. Therefore, for example, fluids such as water may penetrate into the interior of the metal housing 2 through the housing hole 30. In the case of this example, since a fluid passage portion 40 is provided on the bottom surface of the housing main body 3, the fluid that has penetrated into the interior of the metal housing 2 can be made to flow to the fluid passage portion 40. That is, it is difficult for the fluid that has penetrated through the housing hole 30 to adhere to the relay 14 of the relay unit 8 and the bus bar 26.

[0047] In addition, since a discharge hole 41 is formed at the bottom of the housing main body 3, the fluid that has flowed to the fluid passage portion 40 can be discharged from the discharge hole 41 to the outside of the housing main body 3. Therefore, it is difficult for the fluid that has penetrated into the interior of the metal housing 2 to stay inside the metal housing 2. Therefore, it is more helpful to make it difficult for the fluid to reach the relay 14 and the bus bar 26 of the relay unit 8. (Effects of the embodiment)

[0048] According to the structure of the above embodiment, the following effects can be obtained.

[0049] (1) The electrical connection box 1 houses the relay unit 8 for relay connection of the electric wire 7 inside the metal housing 2. The relay unit 8 has a relay 14 mounted on the resin member 13, and the resin member 13 is housed inside the metal housing 2. The metal housing 2 has a heat dissipation portion 38 formed by raising the position facing the relay 14 toward the relay 14.

[0050] According to this structure, a part of the metal case 2 can be made to function as the heat dissipation part 38 as close as possible to the relay 14. Therefore, the heat generated from the relay 14 can be efficiently released to the outside of the metal case 2 via the heat dissipation part 38 at the bottom of the metal case 2. As a result, the heat dissipation performance inside the metal case 2 can be improved.

[0051] (2)The top end of the heat dissipation part 38 that receives the heat generated from the relay 14 is formed in a planar shape. According to this structure, heat from the relay 14 can be received and dissipated over a large planar area, thus further contributing to the improvement of the heat dissipation performance inside the metal case 2.

[0052] (3)The relay unit 8 has a bus bar 26 that is mounted on the resin member 13 and serves as a wiring bus in the resin member 13. The heat dissipation part 38 is formed by making the metal case 2 bulge at a position facing the bus bar 26 connected to the relay 14. According to this structure, the heat transferred from the relay 14 to the bus bar 26 can be smoothly released to the outside of the metal case 2 by the heat dissipation part 38 existing at the position facing the bus bar 26. Therefore, it further contributes to the improvement of the heat dissipation performance inside the metal case 2.

[0053] (4)The metal case 2 has: a case hole 30 for leading out the wire 7 of the connector 18 that is mounted on the resin member 13 and electrically connected to the bus bar 26 to the outside; and a fluid passage part 40, which is a part of the bottom surface of the metal case 2 that is lower than the heat dissipation part 38 and serves as a passage for the fluid that infiltrates into the inside of the metal case 2 from the case hole 30. According to this structure, even if the fluid infiltrates into the inside of the metal case 2 from the case hole 30, since the fluid flows in the fluid passage part 40, it is difficult for the fluid to adhere to electronic components such as the bus bar 26. In addition, when the heat dissipation part 38 is formed at the bottom of the metal case 2, a part other than the bulging heat dissipation part 38 can be used as the fluid passage part 40. Therefore, the internal shape of the bottom of the metal case 2 can be effectively utilized.

[0054] (5)The metal case 2 has a discharge hole 41 for discharging the fluid flowing into the fluid passage part 40 to the outside of the metal case 2. According to this structure, the fluid flowing in the fluid passage part 40 is discharged to the outside of the metal case 2 from the discharge hole 41, so that the adhesion of the fluid to electronic components such as the bus bar 26 can be further suppressed. (Other embodiments)

[0055] In addition, 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 - contradictory range.

[0056] The heat dissipation part 38 is preferably provided in a plurality according to, for example, the number of heat generating elements provided in the resin member 13. That is, the heat dissipation part 38 is preferably provided corresponding to the relay 14 and the fuse provided in the resin member 13 respectively.

[0057] The shape of the heat dissipation part 38 is not limited to a circular shape when viewed from above, and can be changed to, for example, an elliptical shape, a quadrilateral shape, or a triangular shape.

[0058] The heat dissipation part 38 is preferably in close contact with the resin member 13, for example. In this case, a higher heat dissipation effect can be obtained.

[0059] The heat dissipation part 38 is not limited to being arranged at a position corresponding to the bus bar 26, and can also be provided at a position where the bus bar 26 is not arranged.

[0060] The heat dissipation part 38 is not limited to being provided at the bottom of the metal housing 2, and can also be provided, for example, at the upper part or the side part.

[0061] The top end of the heat dissipation part 38 is not limited to a planar shape, and can also be, for example, an angular shape.

[0062] The number of the heat dissipation parts 38 can be one or more. In addition, when a plurality of heat dissipation parts 38 are provided, at least one of them can also be formed in a shape different from the others.

[0063] The metal housing 2 is not limited to a two-component structure, and can also be composed of one component or three or more components.

[0064] The material of the metal housing 2 is only required to be metal, and there is no particular limitation.

[0065] Heat generating elements other than the bus bar 26 and the fuse can also be provided in the space area 35 of the resin member 13.

[0066] The resin member 13 is not limited to a hollow shape having a space area 35 inside, and can also be formed into a simple plate shape by omitting the protective cover 17, for example.

[0067] The heat dissipation holes 34 are not limited to being formed in the upper wall of the resin member 13, and can also be formed in the bottom wall or the side wall, for example.

[0068] The heat dissipation holes 34 are not limited to dissipating the heat in the space area 35 of the resin member 13 to the outside. For example, when the resin member 13 is in a plate shape, that is, when the resin member 13 has a shape without a space area 35, the heat dissipation holes 34 can also be used as holes for releasing the heat on the back side of the resin member 13 to the front side.

[0069] The heat dissipation holes 34 can also be in a shape in which the protruding wall 36 is omitted.

[0070] When there are multiple heat dissipation holes 34, they can also be formed into at least one shape different from others.

[0071] 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 quadrilateral shape, a triangular shape, etc.

[0072] When a relay 14 and a fuse are mounted on the relay unit 8, the heat dissipation object of the heat dissipation hole 34 is not limited to the relay 14 and can also be the fuse. That is, the heat dissipation hole 34 is not limited to being arranged at a position close to the wire 7 connected to the relay 14 and can also be arranged at a position close to the wire 7 connected to the fuse.

[0073] The electrical connection box 1 (relay unit 8) can also have a function of branching and relaying an input to each electrical component when connected to multiple electrical components, for example.

[0074] The present disclosure has been described based on the embodiments, but it should be understood that the present disclosure is not limited to the embodiments and structures. The present disclosure also includes various modifications and modifications within the equivalent scope. In addition, various combinations, forms, and other combinations and forms including only one element, more than one element, or less than one element also fall within the scope and spirit of the present disclosure. Description of Reference Numerals

[0075] 1 Electrical connection box

[0076] 2 Metal housing

[0077] 3 Housing main body

[0078] 4 Upper cover

[0079] 5 Opening

[0080] 6 Fastening member

[0081] 7 Wire

[0082] 8 Relay unit

[0083] 9 First wire

[0084] 10 Second wire

[0085] 13 Resin component

[0086] 14 Relay

[0087] 15 Relay mounting part

[0088] 16 Resin component main body

[0089] 17 Protection cover

[0090] 18 Connector

[0091] 19 Fastening member

[0092] 21 First connector

[0093] 22 Second connector

[0094] 23 First connector mounting portion

[0095] 24 Second connector mounting portion

[0096] 26 Bus bar

[0097] 27 First bus bar

[0098] 29 Second bus bar

[0099] 30 Housing hole

[0100] 31 First housing hole

[0101] 32 Second housing hole

[0102] 34 Heat dissipation hole

[0103] 35 Space area

[0104] 36 Protruding wall

[0105] 38 Heat dissipation portion

[0106] 40 Fluid passage portion

[0107] 41 Discharge hole

[0108] Ha Distance

[0109] Sa Opening area.

Claims

1. An electrical connection box, in which a relay unit for relay connection of electric wires is housed inside a metal casing, The relay unit includes a relay mounted on a resin component, and the resin component is accommodated in the metal housing. The metal case has a heat dissipation portion formed by swelling a position facing the relay toward the relay.

2. The electrical connection box according to claim 1, wherein: The top end of the heat dissipating portion that receives heat generated from the relay is formed in a flat shape.

3. The electrical connection box according to claim 1, wherein: the relay unit has a bus bar which is mounted on the resin member and serves as wiring in the resin member, The heat dissipation portion is formed by swelling the metal case at a position facing the bus bar connected to the relay.

4. The electrical connection box according to claim 1, wherein: the relay unit has a bus bar which is mounted on the resin member and serves as wiring in the resin member, The metal housing has: a housing hole for leading out electric wires of a connector mounted on the resin member and electrically connected to the bus bar to the outside; and The fluid passage portion is a portion of the bottom surface of the metal case that is lower than the heat dissipation portion and serves as a passage for the fluid that enters the metal case from the case hole.

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

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