CN210744671U

CN210744671U - Electrical junction box

Info

Publication number: CN210744671U
Application number: CN201921753937.0U
Authority: CN
Inventors: 万田泰辰
Original assignee: Panasonic Intellectual Property Management Co Ltd
Current assignee: Panasonic Intellectual Property Management Co Ltd
Priority date: 2019-02-05
Filing date: 2019-10-18
Publication date: 2020-06-12
Anticipated expiration: 2029-10-18
Also published as: JP2020127302A

Abstract

The utility model provides a can carry out radiating electrical connection box high-efficiently in the miniaturization. An electrical junction box that relays power to be supplied to a plurality of load devices, the electrical junction box comprising: a housing having a heat dissipating wall; a first heat generating component and a second heat generating component which are arranged in the housing and are supplied with electric power to generate heat; and a connection conductor connecting the first heat generating component and the second heat generating component, the connection conductor having: a first conductor part extending from the first heat generating fitting to the second heat generating fitting and contacting the first heat generating fitting and the second heat generating fitting; and a second conductor portion extending from the first conductor portion toward the heat dissipation wall.

Description

Electrical junction box

Technical Field

The utility model relates to an electrical junction box.

Background

Conventionally, a plurality of electronic components such as relays and fuses are provided in a power supply line in a hybrid vehicle or an electric vehicle, and the power supply line is turned on and off or an electric circuit is cut off when an overcurrent flows through the power supply line using each of the electronic components. It is generally known that these electronic accessories are housed in an electrical junction box. In view of downsizing, electronic components are disposed adjacent to each other in an electric junction box, and a connection conductor such as a bus bar is used for connecting power supply lines of the electronic components disposed adjacent to each other.

However, when a current flows through each electronic component, each electronic component generates heat, and therefore the heat of each electronic component is intensively transferred to a connection conductor connecting the electronic components. Further, when the amount of current flowing to the electrical junction box increases due to an increase in the output of the charging or discharging power, the amount of heat generation tends to increase. Therefore, it is necessary to efficiently dissipate heat of the connection conductor that is transferred.

For example, in patent document 1, both a connection conductor extending from a first electronic component and a connection conductor extending from a second electronic component are fastened to a heat transfer member that transfers heat to a heat dissipation portion, and heat dissipation of the plurality of electronic components is performed via the respective connection conductors.

In patent document 2, a heat transfer member that is in contact with both of a connection conductor extending from a first electronic component and a connection conductor extending from a second electronic component is provided in a cooling portion, and heat dissipation from the plurality of electronic components is performed via the connection conductors.

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open No. 2008-98007

Patent document 2: japanese patent laid-open publication No. 2015-84609

SUMMERY OF THE UTILITY MODEL

Problem to be solved by utility model

However, in the above-described technique, since the heat transfer member is provided in addition to the connection conductor, the heat dissipation efficiency is lowered by the thermal resistance between the members. In addition, since a space for installing a heat transfer member is required between the electric connection box and the plurality of electronic components, it is difficult to miniaturize the electric connection box. Further, if the cross-sectional area of the connection conductor is increased in consideration of heat dissipation in the connection conductor, the electric junction box may be increased in size, weight, and cost.

An object of the utility model is to provide a can carry out radiating electrical connection box high-efficiently when miniaturized.

Means for solving the problems

The utility model discloses an electric connection box is the electric connection box of relaying when carrying out the electric power distribution that will be supplied with to a plurality of load devices, and it possesses:

a housing having a heat dissipating wall;

a first heat generating component and a second heat generating component which are disposed in the case and to which the electric power is supplied to generate heat; and

a connection conductor connecting the first heat generating fitting and the second heat generating fitting,

the connection conductor has:

a first conductor portion extending from the first heat generating fitting to the second heat generating fitting and contacting the first heat generating fitting and the second heat generating fitting; and

a second conductor portion extending from the first conductor portion toward the heat dissipation wall.

Alternatively, the second conductor portion has a heat transfer portion that extends in parallel with the heat radiation wall and transfers heat of the first heat-generating fitting and the second heat-generating fitting to the heat radiation wall.

Alternatively, the second conductor portion has an intermediate portion that extends from the first conductor portion toward the heat radiation wall and is connected to the heat transfer portion, the heat transfer portion being within a range of the first conductor portion in a direction perpendicular to the heat radiation wall and overlapping a range of a contact portion in the first conductor portion that is in contact with at least one of the first heat-generating fitting and the second heat-generating fitting in the direction perpendicular to the heat radiation wall.

Alternatively, the intermediate portion may extend from a predetermined end portion of the first conductor portion so as to be orthogonal to the heat radiation wall.

Alternatively, the connection conductor is constituted by a plate-like member.

Alternatively, the heat sink may further include an insulating member disposed between the second conductor portion and the heat dissipation wall, and the second conductor portion may transfer heat to the heat dissipation wall through the insulating member.

Alternatively, a fixing member may be provided, and the second conductor portion may be fixed to the case by sandwiching the second conductor portion between the fixing member and the heat dissipation wall.

Effect of the utility model

According to the utility model discloses, can dispel the heat high-efficiently when miniaturized.

Drawings

Fig. 1A is a view of an electrical junction box according to an embodiment of the present invention as viewed from above.

Fig. 1B is a view of the electrical junction box with the cover removed, as viewed from above.

Fig. 2 is an exploded perspective view of a second bus bar and a fuse in the electrical junction box.

Fig. 3 is a view of the second bus bar portion in the housing as viewed from the rear.

Fig. 4 is an X-X sectional view in fig. 3.

Fig. 5A is a sectional view showing a structure in which the second bus bar is fixed by the fixing portion.

Fig. 5B is a diagram showing a structure in which the second bus bar is fixed by the fixing portion and the heat transfer member is provided.

Fig. 6 is a view showing a second bus bar according to a modification.

Fig. 7 is a view showing a second bus bar according to a modification.

Fig. 8 is a diagram showing a second bus bar according to a modification.

Fig. 9 is a view showing a second bus bar according to a modification.

Fig. 10 is a view showing a second bus bar according to a modification.

Description of the reference numerals

1 electric connection box

10 cover

20 casing

20A side wall

20B bottom wall

21 fixed part

22 connector part

23 fixed part

30 circuit board

40 current sensor

50 first bus bar

60 Relay

61 projection

70 fuse

71 body part

72 connecting part

100 second bus bar

110 first part

111 holes

120 second part

130 third part

131 protruding part

140 fourth part

150 fifth part

160 fixing part

170 insulating member

Detailed Description

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. Fig. 1A is a view of an electrical junction box 1 according to an embodiment of the present invention as viewed from above. Fig. 1B is a view of the electrical junction box 1 with the cover 10 removed, as viewed from above.

The electrical junction box 1 shown in fig. 1A and 1B is provided in an electric power system of a vehicle V such as a hybrid vehicle or an electric vehicle, and is connected to a vehicle ECU (Electronic Control Unit) and a plurality of load devices (not shown). The electrical junction box 1 is used to introduce a high-voltage power line or the like led from each load device, and to relay power supplied thereto when distributing the power to a plurality of load devices.

Further, the plurality of load devices includes: a battery, an inverter, a DC/DC converter (direct current/direct current converter), a charging device, an electric compressor, a heater, a cooler, and the like.

The electrical junction box 1 includes: the cover 10, the case 20, the circuit substrate 30, the current sensor 40, the first bus bar 50, the relay 60, the fuse 70, and the second bus bar 100. The opening portion of the case 20 is closed by fastening the cover 10 to the end surfaces of the four side walls 20A constituting the case 20.

The housing 20 is formed in a rectangular box shape having four side walls 20A and a bottom wall 20B (see fig. 3). The housing 20 is made of metal and has a fixed portion 21 and a connector portion 22. The bottom wall 20B corresponds to a "heat radiation wall" of the present invention.

The fixed portion 21 is provided at a lower end portion of the side wall 20A (see also fig. 2), and has a hole through which a screw passes. A screw is passed through the hole to fasten the fitting, to which the electric connection box 1 is fixed, to the housing 20, thereby fixing the electric connection box 1. In the present embodiment, two, that is, four fixed portions 21 in total are provided on each of the front side wall 20A and the rear side wall 20A of the housing 20.

The connector portion 22 is a portion to which the vehicle ECU and the plurality of power modules are connected, and the same number of connector portions 22 are provided in the side wall 20A and the like in accordance with the number of devices connected to the electrical junction box 1, such as the vehicle ECU and the plurality of load devices, to be connected.

The circuit board 30 is mounted with various circuits and is disposed on the front side wall 20A in the housing 20.

The current sensor 40 is a hall-type current sensor (see also fig. 2) including a circular core (an undivided cylindrical magnetic core), and is disposed in the vicinity of the left end portion in the case 20.

The first bus bar 50 is made of metal, and connects the relay 60 to an external device. The first bus bar 50 extends in the left-right direction, and has holes through which screws or projections 61 of a relay 60 described later are inserted at both left and right ends.

First bus bar 50 is inserted into the core of current sensor 40, and fixed in housing 20 by screws and projections 61 inserted through the holes (see also fig. 2 and 3). Thereby, the current sensor 40 can detect the current flowing through the first bus bar 50.

The relay 60 is a relay element provided on an electric power line to which an external device is connected, and switches the connection state of the electric power line to either on or off by control of the vehicle ECU. The relay 60 is disposed in the center portion in the left-right direction near the rear side wall 20A in the housing 20.

As shown in fig. 2, two protrusions 61 that pass through the holes of the first bus bar 50 and the holes 111 of the second bus bar 100 are provided on the upper surface of the relay 60.

The fuse 70 is an element that cuts off a circuit when an overcurrent flows through the power line, and is disposed near the right side wall 20A in the case 20 (see fig. 1B). The fuse 70 includes a columnar body portion 71 extending in the left-right direction, and a pair of connecting portions 72 protruding from both left and right ends of the body portion 71.

A hole is formed in each of the pair of connecting portions 72. The left connecting portion 72 is connected to the second bus bar 100. A projection 131 of the second bus bar 100, which will be described later, is inserted into a hole of the left connection portion 72. The right connecting portion 72 is disposed on the fixing portion 23 protruding from the bottom wall 20B of the housing 20 (see fig. 3). A screw is inserted into a hole of the right connecting portion 72, and the screw is fastened to the fixing portion 23 together with a predetermined terminal. Thereby, the fuse 70 is fixed in the housing 20.

The fixing portion 23 is made of an insulating member such as resin. When the fixing portion 23 is formed of a conductive member, an insulating member is provided between the connecting portion 72 and the predetermined terminal and the fixing portion 23.

The second bus bar 100 is a plate-shaped member made of metal and connecting the relay 60 and the fuse 70, and is formed by, for example, bending one plate-shaped member. The second bus bar 100 has a first portion 110, a second portion 120, a third portion 130, a fourth portion 140, and a fifth portion 150. The second bus bar 100 corresponds to a "connecting conductor" of the present invention.

The first portion 110 extends rightward from a position corresponding to the relay 60 and then extends forward. A hole 111 through which the protrusion 61 of the relay 60 is inserted is formed at the left end of the first portion 110. The second bus bar 100 is fixed to the relay 60 by inserting the protrusion 61 into the hole 111 of the first portion 110 and fastening it by a nut 61A (see fig. 3).

The second portion 120 extends downward from the front end of the first portion 110. The third portion 130 extends from the lower end of the second portion 120 to the front side. A protrusion 131 is provided on the upper surface of the third portion 130.

The protrusion 131 is inserted into a hole of the connection portion 72 of the fuse 70 and is fastened by a nut 72A, so that the fuse 70 is fixed to the second bus bar 100. Thereby, the second bus bar 100 contacts both the relay 60 and the fuse 70, and the relay 60 is conducted with the fuse 70. The first portion 110, the second portion 120, and the third portion 130 correspond to a "first conductor portion" of the present invention.

As shown in fig. 2 and 3, the fourth portion 140 extends downward from the front end of the third portion 130 to the insulating member 170 disposed on the bottom wall 20B of the housing 20. In other words, the fourth portion 140 extends from a prescribed end of the third portion 130 orthogonally to the bottom wall 20B.

As shown in fig. 3 and 4, the fifth portion 150 extends rearward from the lower end of the fourth portion 140 in parallel with the bottom wall 20B.

The fifth portion 150 is secured to the housing 20 by a securing member 160. The fixing member 160 is a resin formed in a plate shape, and sandwiches the fifth portion 150 with the bottom wall 20B. The fixing member 160 has holes formed at left and right sides of the fifth portion 150. The second bus bar 100 is fixed in the housing 20 by inserting a screw 161 into the hole and screwing into the bottom wall 20B.

The fixing member 160 may be provided only for fixing the fifth portion 150, or may be used as a member having another purpose, such as a substrate on which a circuit pattern is mounted, a member for arranging accessories, or the like.

Further, a sheet-like insulating member 170 is disposed between the fifth portion 150 and the bottom wall 20B. The insulating member 170 suppresses leakage of electricity from the second bus bar 100 to the case 20.

By fixing the secondary bus bar 100 to the housing 20 in this manner, the heat of the secondary bus bar 100 can be transmitted to the bottom wall 20B of the housing 20. The fourth portion 140 and the fifth portion 150 correspond to a "second conductor portion" of the present invention. The fourth section 140 corresponds to the "middle section" of the present invention. The fifth portion 150 corresponds to a "heat transfer portion" of the present invention.

In addition, as shown in fig. 4, the fifth portion 150 is disposed in a region (refer to a dotted line Y) below the third portion 130. In other words, the fifth portion 150 is within the range of the third portion 130 in the up-down direction, and overlaps with the range of the contact portion with the fuse 70 in the third portion 130 in the up-down direction. In addition, the length of the fifth portion 150 in the front-rear direction is equal to the length of the third portion 130 in the front-rear direction.

The operational effects of the electrical junction box 1 of the present embodiment configured as described above will be described. Since the fifth portion 150 of the second bus bar 100 is disposed on the bottom wall 20B of the housing 20 with the insulating member 170 interposed therebetween, heat of the second bus bar 100 can be conducted from the fifth portion 150 to the bottom wall 20B.

The heat transferred to the bottom wall 20B is released from the outer surface of the bottom wall 20B. That is, heat dissipation of the second bus bar 100 can be performed via the bottom wall 20B.

The relay 60 and the fuse 70 are supplied with electric power to generate heat. Relay 60 corresponds to the utility model discloses a "first accessory that generates heat", fuse 70 corresponds to the utility model discloses a "second accessory that generates heat".

The second bus bar 100 is in contact with the relay 60 and the fuse 70, so that heat generated from the relay 60 and heat generated from the fuse 70 are intensively transferred to the second bus bar 100. In the present embodiment, the heat intensively conducted to the second bus bar 100 is transferred to the bottom wall 20B via the fourth and

fifth portions

140 and 150. This enables the second bus bar 100 to efficiently dissipate heat.

Here, it is assumed that: for example, as shown in fig. 5A and 5B, the bus bar 200 without the fourth and

fifth portions

140 and 150 is provided in the electrical junction box 1. The bus bar 200 has a first portion 210, a second portion 220, and a third portion 230.

The first portion 210, the second portion 220, and the third portion 230 have substantially the same structure as the first portion 110, the second portion 120, and the third portion 130 of the second bus bar 100. Specifically, the first portion 210 extends rightward from the connection portion of the relay 60. The second portion 220 extends downward from the right end of the first portion 210. The third portion 230 extends rightward from the lower end portion of the second portion 220 and is connected to the fuse 70.

In the case of such a bus bar 200, for example, the following configuration as shown in fig. 5A may be considered: similarly to the right connecting portion 72 of the fuse 70, the fixing portion 23 is provided in the left connecting portion 72 to fix the third portion 230 of the bus bar 200.

With such a configuration, the portion of the third portion 230 of the bus bar 200 comes into contact with the fixing portion 23, but when the fixing portion 23 is formed of resin from the viewpoint of preventing electrical leakage, the heat transfer efficiency is low, and heat cannot be efficiently dissipated.

In contrast, in the present embodiment, the fourth portion 140 and the fifth portion 150 extend from the third portion 130 to the bottom wall 20B and transfer heat to the bottom wall 20B. That is, in the present embodiment, heat is radiated using the space below the second bus bar 100, and therefore, the heat radiation efficiency can be improved as compared with the structure of fig. 5A.

In the case where the bus bar 200 is fixed to the fixing portion 23, it is conceivable to separately provide a heat transfer member 24 in the case 20 as shown in fig. 5B. In order to provide the heat transfer member 24, for example, it is necessary to: the length of the left-right direction of the third portion 230 in the bus bar 200 is increased to secure a space in the bus bar 200, which is in contact with the heat transfer member 24.

With such a configuration, a space for disposing the heat transfer member 24 needs to be provided in the case 20 as the bus bar 200 is enlarged. As a result, the electric junction box 1 may be increased in size, weight, and cost.

In contrast, in the present embodiment, heat can be transferred to the bottom wall 20B through the fifth portion 150, and therefore, a heat transfer member does not need to be separately provided. As a result, in the present embodiment, the space for installing the heat transfer member can be eliminated, and therefore the electric connection box 1 can be downsized.

That is, in the present embodiment, the heat radiation can be efficiently performed while the electric junction box 1 is downsized.

In addition, since the fifth portion 150 extends parallel to the bottom wall 20B, the area of the fifth portion 150 can be enlarged by the space below the third portion 130. As a result, the heat dissipation efficiency of the second bus bar 100 can be further improved.

In addition, the fifth portion 150 is provided within the range of the third portion 130, so the space under the third portion 130 can be effectively utilized, and the space for providing the bottom wall 20B of the fifth portion 150 can be reduced as much as possible. As a result, the electric junction box 1 can be made smaller.

In addition, since the length of the fifth portion 150 in the front-rear direction is equal to the length of the third portion 130 in the front-rear direction, the fifth portion 150 can be made as long as possible, and the heat dissipation efficiency in the second bus bar 100 can be further improved.

Further, since the fourth portion 140 extends from the end of the third portion 130 in the direction perpendicular to the bottom wall 20B, no special processing is required, and the second bus bar 100 can be easily manufactured.

In addition, since the second bus bar 100 is formed of a plate-like member, the second bus bar 100 can be easily manufactured by bending one plate-like member.

Further, since the second bus bar 100 is formed of a plate-like member, the first portion 110, the second portion 120, the third portion 130, the fourth portion 140, and the fifth portion 150 can be integrally formed. As a result, there is no thermal resistance generated when the electrically-conductive connection portion (the first portion 110, the second portion 120, and the third portion 130) and the heat transfer portion (the fourth portion 140 and the fifth portion 150) are different members, and thus the heat dissipation efficiency can be improved. In addition, the strength of the second bus bar 100 can be improved.

Further, since the second bus bar 100 transfers heat to the bottom wall 20B via the insulating member 170, heat dissipation of the second bus bar 100 can be performed while preventing electric leakage.

Further, since the second bus bar 100 is fixed to the bottom wall 20B by the fixing member 160, the second bus bar 100 does not need to be fixed, and therefore, the second bus bar 100 can be easily manufactured.

The bottom wall 20B may have any structure, but a heat radiating member such as a heat sink may be provided. Further, a member for cooling the bottom wall 20B may be separately provided.

In the above embodiment, the fourth portion 140 extends from the front end of the third portion 130, but the present invention is not limited thereto, and may extend from a portion other than the end of the third portion 130. For example, as shown in fig. 6, the fourth portion 140A may extend from the central portion of the third portion 130 in the front-rear direction. The fourth portion 140A in this structure is connected to the central portion in the front-rear direction of the fifth portion 150.

In addition, in the above embodiment, the fourth section 140 extends orthogonally to the bottom wall 20B, but the present invention is not limited thereto, and the fourth section 140 may not be orthogonal to the bottom wall 20B. For example, as shown in fig. 7, the fourth portion 140B may be configured to extend from the front end of the third portion 130 to the rear end of the fifth portion 150.

In addition, in the above embodiment, the third part 130 is connected to the fifth part 150 only by the fourth part 140, but the present invention is not limited thereto. For example, as shown in fig. 8, the third portion 130 may be connected to the fifth portion 150 by a front intermediate portion 140C connecting the front end of the third portion 130 to the front end of the fifth portion 150 and a rear intermediate portion 140D connecting the rear end of the third portion 130 to the rear end of the fifth portion 150.

In the above embodiment, the bottom wall 20B of the case 20 is exemplified as the heat radiation wall, but the present invention is not limited thereto, and the heat radiation wall may be the side wall 20A of the case 20. In this case, for example, as shown in fig. 9, the second bus bar 100 may not have the fifth portion 150. Specifically, the fourth portion 140 is a heat transfer wall extending parallel to the side wall 20A. The second bus bar 100 shown in fig. 9 is the same as the second bus bar 100 of the above embodiment except that the fifth portion 150 is not provided.

Accordingly, heat can be efficiently transferred to the side wall 20A through the fourth portion 140. Note that, in fig. 9, the insulating member is not shown.

In the above embodiment, the second bus bar 100 having the first portion 110, the second portion 120, and the third portion 130 is exemplified as the first conductor portion, but the present invention is not limited thereto, and the shape of the first conductor portion may be appropriately changed according to the connected heat generating component. For example, as shown in fig. 10, the second bus bar 100 may not have the second portion 120 and the third portion 130.

The second bus bar 100 in this structure is composed of a first portion 110, a fourth portion 140, and a fifth portion 150. The first portion 110 extends from the relay 60 to the fuse 70. The fourth portion 140 extends downward from a portion connected to the fuse 70 at the front end portion of the first portion 110. The fifth portion 150 extends from the lower end of the fourth portion 140 in parallel with the bottom wall 20B and is disposed within the first portion 110.

Such a configuration also enables the electrical junction box 1 to be downsized and efficiently dissipate heat, as in the above-described embodiment.

In the above embodiment, the length of the fifth portion 150 in the front-rear direction is equal to the length of the third portion 130 in the front-rear direction, but the present invention is not limited thereto, and the length of the fifth portion 150 in the front-rear direction may be shorter than the length of the third portion 130 in the front-rear direction or longer than the length of the third portion 130 in the front-rear direction. However, in view of the downsizing and heat dissipation of the electrical junction box 1, the length of the fifth portion 150 in the front-rear direction is preferably equal to the length of the third portion 130 in the front-rear direction.

In addition, in the above-described embodiment, the fourth portion 140 extends from the portion of the second bus bar 100 to which the fuse 70 (second heat generating fitting) is connected, but the present invention is not limited thereto. For example, the fourth portion 140 may also extend from a portion of the second bus bar 100 to which the relay 60 (first heat generating fitting) is connected.

In the above embodiment, the relay 60 and the fuse 70 are exemplified as the first heat generating component and the second heat generating component, but the present invention is not limited to this, and electronic components other than the relay 60 and the fuse 70 may be the first heat generating component and the second heat generating component.

In addition, in the above embodiment, the fixing member 160 clamps the fifth portion 150 between the bottom wall 20B and the second bus bar 100, thereby fixing the second bus bar 100 to the housing 20, but the present invention is not limited thereto, and the second bus bar 100 may be fixed to the housing 20 by another method.

In the above embodiment, the second bus bar 100 is formed of a plate-like member, but the present invention is not limited thereto and may not be formed of a plate-like member. In the case where the second bus bar 100 is not formed of a plate-like member, the first conductor portion and the second conductor portion may be separate bodies. However, in view of the ease of manufacturing the second bus bar 100 and the strength of the second bus bar 100, it is preferable that the second bus bar 100 is formed of a plate-like member.

The above embodiments are merely examples of implementing the present invention, and the technical scope of the present invention should not be limited by these embodiments. That is, the present invention can be implemented in various forms without departing from the gist or main features thereof.

Industrial applicability

The utility model discloses an electric junction box is useful as can carrying out radiating electric junction box high-efficiently when miniaturized.

Claims

1. An electrical junction box that relays power to be supplied to a plurality of load devices, the electrical junction box comprising:

a housing having a heat dissipating wall;

the connection conductor has:

2. The electrical connection box of claim 1,

the second conductor portion has a heat transfer portion that extends parallel to the heat radiation wall and transfers heat of the first heat generating component and the second heat generating component to the heat radiation wall.

3. The electrical connection box of claim 2,

the second conductor portion has an intermediate portion extending from the first conductor portion toward the heat radiation wall and connected to the heat transfer portion,

the heat transfer portion is within a range of the first conductor portion in a direction perpendicular to the heat radiation wall, and overlaps with a range of a contact portion in the first conductor portion that is in contact with at least one of the first heat-generating fitting and the second heat-generating fitting in the direction perpendicular to the heat radiation wall.

4. An electrical connection box as claimed in claim 3,

the intermediate portion extends from a predetermined end portion of the first conductor portion so as to be orthogonal to the heat radiation wall.

5. An electrical connection box as claimed in any one of claims 1 to 4,

the connection conductor is constituted by a plate-like member.

6. An electrical connection box as claimed in any one of claims 1 to 4,

an insulating member disposed between the second conductor portion and the heat dissipation wall,

the second conductor portion transfers heat to the heat radiation wall via the insulating member.

7. An electrical connection box as claimed in any one of claims 1 to 4,

the heat sink includes a fixing member that fixes the second conductor portion to the case by sandwiching the second conductor portion between the fixing member and the heat dissipation wall.