ELECTRICAL CONNECTION BOX

An electrical connection box includes a substrate on which a fuse element including terminals is mounted, and a case member in which the substrate is housed. Through holes pass through the substrate in the thickness direction, the terminals of the fuse element are inserted into the through holes on one surface side of the substrate and protrude from the other surface side, and the protruding portions of the terminals are in contact with the case member.

TECHNICAL FIELD

The present disclosure relates to an electrical connection box that includes a substrate.

BACKGROUND

JP 2019-140420A discloses a circuit board in which a metal plate is partially joined to an insulating substrate, and in this circuit board, a recessed portion is provided in the metal plate, and the lead (terminal) of an element is joined in the recessed portion, and therefore the thickness of the metal plate in the portion where the lead and the metal plate are joined can be reduced by an amount corresponding to the depth of the recessed portion, and thermal stress is reduced.

In an electrical connection box that includes a substrate on which a circuit element such as a fuse element is mounted, the circuit element of the substrate generates heat during operation. That heat is transferred to the substrate, and the temperature of the board rises if the heat from multiple circuit elements is concentrated on the substrate, which may lead to damage to circuit elements that have poor heat resistance, which in turn may cause a malfunction in the electrical connection box.

However, in JP 2019-140420A, such a problem is not taken into consideration and has not been solved.

In view of this, an object of the present disclosure is to provide an electrical connection box that can efficiently prevent a temperature rise that may occur in a substrate during operation.

SUMMARY

An electrical connection box according to an aspect of the present disclosure is an electrical connection box including: a substrate on which a circuit element that includes a terminal is implemented; and a housing in which the substrate is housed, wherein the terminal of the circuit element passes through the substrate and is in contact with the housing.

An electrical connection box according to another aspect of the present disclosure is an electrical connection box including: a substrate on which a circuit element that includes a terminal is implemented; a housing in which the substrate is housed; and a heat conduction member arranged between the substrate and the housing, wherein the terminal of the circuit element passes through the substrate and is in contact with the heat conduction member, and the heat conduction member is in contact with the housing.

Effects of Present Disclosure

According to the present disclosure, it is possible to provide an electrical connection box that can efficiently prevent a temperature rise that may occur in a substrate during operation.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENTS

First, embodiments of the present disclosure will be listed and described. Also, at least portions of the embodiments described below may be combined as appropriate.

First Aspect

An electrical connection box according to a first aspect of the present disclosure is an electrical connection box including: a substrate on which a circuit element that includes a terminal is implemented; and a housing in which the substrate is housed, wherein the terminal of the circuit element passes through the substrate and is in contact with the housing.

In the first aspect, the terminal of the circuit element is inserted into the through hole of the substrate on one surface side of the substrate and protrudes from the other surface side, and the protruding portion of the terminal is in contact with the housing. Accordingly, heat generated by the circuit element is directly transmitted to the housing and dissipated via the housing, and is unlikely to be transmitted to the substrate. Accordingly, heat generated by the circuit element can be quickly dissipated, and a rise in the temperature of the substrate can be prevented.

Second Aspect

An electrical connection box according to a third aspect of the present disclosure is an electrical connection box including: a substrate on which a circuit element that includes a terminal is implemented; a housing in which the substrate is housed; and a heat conduction member arranged between the substrate and the housing, wherein the terminal of the circuit element passes through the substrate and is in contact with the heat conduction member, and the heat conduction member is in contact with the housing.

In the second aspect, the terminal of the circuit element is inserted into the through hole of the substrate on one surface side of the substrate and protrudes from the other surface side, the protruding portion of the terminal is in contact with the heat conduction member, and that heat conduction member is in contact with the housing. Accordingly, the heat generated by the circuit element is directly transmitted to the heat conduction member, and is then transmitted to the housing via the heat conduction member. The heat transmitted to the housing is dissipated via the outer surface of the housing, for example. Accordingly, heat generated by the circuit element can be quickly dissipated, and the heat generated by the circuit element is not likely to be transmitted to the substrate, and thus a rise in the temperature of the substrate can be prevented.

Third Aspect

In the electrical connection box according to a third aspect of the present disclosure, the heat conduction member has elasticity.

In the third embodiment, the heat conduction member in contact with the terminal of the circuit element has elasticity, and thus it is possible to absorb manufacturing error in the distance between the terminal of the circuit element and the heat conduction member.

Fourth Aspect

In the electrical connection box according to a fourth aspect of the present disclosure, the terminal includes an end portion that is bent in a direction intersecting an extending direction, and the end portion is in contact with the housing.

In the fourth aspect, the end portion of the terminal is bent in a direction that intersects the extending direction thereof. In other words, the end portion of the terminal is bent so as to extend parallel with the inward surface of the housing, and therefore a wide area of contact between the end portion of the terminal and the housing can be secured. Accordingly, heat generated by the circuit element is transmitted to the housing even more efficiently.

Fifth Aspect

In the electrical connection box according to a fifth aspect of the present disclosure, the terminal includes an end portion that is bent in a direction intersecting an extending direction, and the end portion is in contact with the heat conduction member.

In the fifth aspect, the end portion of the terminal is bent in a direction that intersects the extending direction thereof. In other words, the end portion of the terminal is bent so as to extend parallel with the contact surface of the heat conduction member that is in contact with the terminal, and therefore a wide area of contact between the end portion of the terminal and the heat conduction member can be secured. Accordingly, heat generated by the circuit element is transmitted to the heat conduction member even more efficiently.

Sixth Aspect

In the electrical connection box according to a sixth aspect of the present disclosure, the terminal has a notch formed in a vicinity of the end portion.

In the sixth aspect, a notch is formed in the terminal in the vicinity of the end portion, and thus the end portion is guided to bend at the position of the notch. This therefore makes it possible to facilitate the operation of implementation in the electrical connection box.

An electrical connection box according to embodiments of the present disclosure will be described below with reference to the drawings. It should be noted that the present disclosure is not limited to these examples, but rather is indicated by the scope of claims, and is intended to include all modifications within a meaning and scope equivalent to the scope of claims.

First Embodiment

FIG.1is a perspective view showing the appearance of an electrical connection box100according to a first embodiment. The electrical connection box100is also called a vehicle junction box.

In this embodiment, for convenience, the “front”, “rear”, “left”, “right”, “upper”, and “lower” sides of the electrical connection box100are defined by the front-rear, left-right, and up-down directions shown inFIG.1. The following description is given using the front-rear, left-right, and up-down directions defined in this way.

The electrical connection box100includes a case member30(housing) for accommodating a later-described substrate structure20, and the case member30includes an upper case portion31and a lower case portion32. The substrate structure20is attached to the lower case portion32, and the upper case portion31covers the lower case portion32and the substrate structure20.

FIG.2is a perspective view showing a state in which the upper case portion31has been removed from the electrical connection box100according to the first embodiment. The lower case portion32has a rectangular bottom plate and side plates that rise perpendicularly from the edges of the bottom plate. The substrate structure20is attached to the bottom plate.

The substrate structure20includes a substrate21that covers substantially the entirety of the bottom plate of the lower case portion32, and circuit components that are mounted on the upper surface of the substrate21. Also, a plurality of connection ports60are provided in the front and rear side plates of the lower case portion32. Each connection port60is connected to the substrate21via connection terminals61that are bent in an L shape.

Also, a plurality of fuse elements10are mounted on the substrate21. The fuse elements10are mounted in a row along the left edge of the substrate21, and are connected by soldering or the like to a conductive pattern (not shown) formed on the substrate21.

Hereinafter, for convenience, the fuse elements10will be described as an example of circuit elements mounted on the substrate21.

FIG.3is a perspective view showing a fuse element10according to the first embodiment, andFIG.4is a schematic front view of the fuse element10according to the first embodiment.FIGS.3and4show the state before mounting on the substrate21.

The fuse element10includes a fuse element111, two connecting portions13, and a housing112that is made of an insulating material and houses the fuse element111and the two connecting portions13. The two connecting portions13are made of a conductive material, are shaped as a rectangle that is elongated in one direction, and are separated by a gap having an appropriate length in a direction that intersects the one direction.

The fuse element111is made of a conductive material and has a thin linear shape. The fuse element111is bent in a U shape and arranged between the two connecting portions13, and the two ends of the fuse element111are connected to the respective connecting portions13. The two connecting portions13respectively include a pair of terminals12aand12bthat integrally extend from the connecting portions13and protrude from one surface14of the housing112. In other words, one connecting portion13and the terminal12aare integrated with each other, and the other connecting portion13and the terminal12bare integrated with each other.

The fuse element10configured in this way is used by connecting the pair of terminals12aand12bto the substrate21. The fuse element111is provided within a circuit of the substrate21via the pair of terminals12aand12band the two connecting portions13. If an overcurrent flows in the circuit, the fuse element111blows in order to cut off the overcurrent.

FIG.5is a vertical cross-sectional view taken along a line V-V inFIG.2. More specifically,FIG.5shows the fuse element10mounted on the substrate21.

The substrate21is housed in the lower case portion32, and the substrate21faces the bottom plate321of the lower case portion32. The substrate21is provided with a plurality of through holes211that penetrate the substrate21in the thickness direction. The pair of terminals12aand12bof the fuse element10are inserted through a corresponding through hole211from the upper surface side of the substrate21, and protrude from the lower surface of the substrate21. In this state, the fuse element10is electrically connected by soldering or the like to a conductive pattern (not shown) formed on the substrate21.

At this time, the leading ends of the pair of terminals12aand12bof the fuse element10are in contact with the bottom plate321of the lower case portion32.

Although one fuse element10among the plurality of fuse elements10has been described above as an example, the other fuse elements10also have the same configuration and thus will not be described.

Also, although the fuse element10has been described above as an example of a circuit element, the present disclosure is not limited to this, and the description similarly applies to other circuit elements mounted on the substrate21.

Due to having the above configuration, the electrical connection box100according to the present embodiment can efficiently dissipate heat generated in the substrate structure20(substrate21) during operation.

During the operation of the electrical connection box, heat is generated by circuit elements such as the fuse elements mounted on the substrate. Such heat is transmitted to the substrate and disperses. However, the temperature of the substrate rises if the heat from multiple circuit elements is concentrated on the substrate, which may lead to damage to circuit elements that have poor heat resistance, which in turn may cause a malfunction in the electrical connection box.

In order to solve this problem, the electrical connection box100has a configuration in which the terminals of the circuit elements are in contact with the lower case portion32. Hereinafter, the fuse element10will be described as an example of the circuit element.

As described above, the leading ends of the terminals12aand12bof the fuse element10are in contact with the bottom plate321of the lower case portion32. Accordingly, in the electrical connection box100, heat generated by the fuse element10is directly transmitted to the lower case portion32via the terminals12aand12b,and thus the heat is not likely to be transferred to the substrate21. Moreover, the heat transferred to the lower case portion32is dispersed throughout the lower case portion32and is air-cooled via the outer surface of the lower case portion32.

Accordingly, the electrical connection box100according to the present embodiment can prevent damage to the circuit element caused by a rise in the temperature of the substrate21, and can efficiently dissipate the heat generated by the circuit element.

Second Embodiment

FIG.6is a vertical cross-sectional view showing a fuse element10mounted on the substrate21in the substrate structure20according to a second embodiment.

The substrate21is housed in the lower case portion32so as to face the bottom plate321of the lower case portion32. The pair of terminals12aand12bof the fuse element10penetrate the substrate21through the through holes211. The fuse element10is electrically connected by soldering or the like to a conductive pattern (not shown) formed on the substrate21.

A heat conduction member40is arranged between the substrate21and the bottom plate321of the lower case portion32. The heat conduction member40is a sheet made of a silicon-based or non-silicon-based material, for example, and has elasticity. The heat conduction member40is arranged at least at a position corresponding to the fuse element10in the facing direction in which the bottom plate321and the substrate21face each other. The lower surface of the heat conduction member40is in contact with the inward surface of the bottom plate321of the lower case portion32.

At this time, the leading ends of the terminals12aand12bof the fuse element10are in elastic contact with the upper surface of the heat conduction member40.

Although one fuse element10among the plurality of fuse elements10has been described above as an example, the terminals12aand12bof the other fuse elements10are similarly in contact with heat conduction member40.

Also, although the fuse element10has been described above as an example of a circuit element, the present disclosure is not limited to this, and, similarly to the fuse element10, the terminals of other circuit element mounted on the substrate21are also in contact with heat conduction member40.

Due to having the above configuration, the electrical connection box100according to the present embodiment can efficiently dissipate heat generated in the substrate structure20(substrate21) during operation.

As described above, circuit elements such as fuse elements mounted on the substrate generate heat during the operation of the electrical connection box, and the temperature of the substrate rises if the heat from multiple circuit elements is concentrated on the substrate, which may lead to damage to circuit elements that have poor heat resistance, which in turn may cause a malfunction in the electrical connection box.

In order to solve this problem, the electrical connection box100has a configuration in which the terminals of the circuit elements are in contact with the lower case portion32via the heat conduction member40that has elasticity. Hereinafter, the fuse element10will be described as an example of the circuit element.

As described above, the leading ends of the terminals12aand12bof the fuse element10are in elastic contact with the upper surface of the heat conduction member40, and the lower surface of the heat conduction member40is in contact with the bottom plate321of the lower case portion32. Accordingly, in the electrical connection box100, the heat generated by the fuse element10is quickly transmitted to the heat conduction member40via the terminals12aand12b.The heat transmitted to the heat conduction member40is air-cooled via the surface of the heat conduction member40, and is transmitted to the lower case portion32via the lower surface. Faster heat conduction is possible because the lower surface of the heat conduction member40is in contact with the lower case portion32.

Accordingly, it is unlikely for the heat generated by the fuse element10to be transmitted to the substrate21. Moreover, the heat transmitted to the lower case portion32is dispersed throughout the lower case portion32and is air-cooled via the outer surface of the lower case portion32.

Accordingly, the electrical connection box100according to the present embodiment can prevent damage to the circuit element caused by a rise in the temperature of the substrate21, and can efficiently dissipate the heat generated by the circuit element.

Furthermore, in the electrical connection box100according to the present embodiment, the heat conduction member40has elasticity. Accordingly, it is possible to absorb manufacturing error related to the spacing between the heat conduction member40and the terminals12aand12bof the fuse element10, and manufacturing error related to the spacing between the bottom plate321of the lower case portion32and the substrate21, for example.

Portions similar to those in the first embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.

Third Embodiment

FIG.7is a side view of the fuse element10that has been mounted on the substrate21in the substrate structure20according to a third embodiment. Specifically,FIG.7shows the fuse element10according to the third embodiment as viewed from the same direction as the arrow direction inFIG.6.

The substrate21is housed in the lower case portion32so as to face the bottom plate321of the lower case portion32. A heat conduction member40is arranged between the substrate21and the bottom plate321of the lower case portion32. The heat conduction member40is sheet-like and has elasticity. The heat conduction member40is arranged at a position that corresponds to the fuse element10in the facing direction in which the bottom plate321and the substrate21face each other. The lower surface of the heat conduction member40is in contact with the inward surface of the bottom plate321of the lower case portion32.

The terminals12aand12bof the fuse element10penetrate the substrate21through the through holes211. Also, in the fuse element10according to the present embodiment, end portions125aand125bof the terminals12aand12bin the extending direction thereof are bent in a direction that intersects the extending direction.

In other words, the end portions125aand125bof the terminals12aand12bare bent along the contact surface (upper surface) of the heat conduction member40that is contact with the terminals12aand12b.In this state, the fuse element10is electrically connected to the substrate21by soldering, for example.

At this time, the end portions125aand125bof the terminals12aand12bof the fuse element10are in elastic contact with the upper surface of the heat conduction member40.

Although one fuse element10among the plurality of fuse elements10has been described above as an example, the end portions125aand125bof the terminals12aand12bof the other fuse elements10are similarly in contact with heat conduction member40.

Also, although the fuse element10has been described above as an example of a circuit element, the present disclosure is not limited to this. Similarly to the fuse element10, the end portions of the terminals of the other circuit elements mounted on the substrate21are also bent and in contact with the heat conduction member40.

Due to having the above configuration, the electrical connection box100according to the present embodiment can efficiently dissipate heat generated in the substrate structure20(substrate21) during operation.

During operation of the electrical connection box, heat generated by a circuit element such as a fuse element is transmitted to the substrate, and thus the temperature of the substrate rises, which may cause damage to the circuit element or a malfunction in the electrical connection box.

In order to solve such a problem, the electrical connection box100has a configuration in which the end portions of the terminals of the circuit element are in contact with the heat conduction member40that has elasticity, and the heat conduction member40is in contact with the lower case portion32. Hereinafter, the fuse element10will be described as an example of the circuit element.

As described above, in the fuse element10according to the present embodiment, the end portions125aand125bof the terminals12aand12bare bent along the upper surface of the heat conduction member40and are in elastic contact with the upper surface of the heat conduction member40, and the lower surface of the heat conduction member40is in contact with the bottom plate321of the lower case portion32. At this time, the upper surface of the heat conduction member40and the end portions125aand125bof the terminals12aand12bare in contact with each other in a predetermined range.

Specifically, as shown inFIG.7, for each of the end portions125aand125b, a contact portion S thereof corresponding to the predetermined range is in contact with the heat conduction member40. Accordingly, the heat conduction path from the fuse element111, which is a heat generation source, to the heat conduction member40is shortened, and a wide area of contact between the heat conduction member40and the terminals12aand12bcan be ensured.

Accordingly, in the electrical connection box100, the heat generated by the fuse element10is transmitted to the heat conduction member40more quickly via the terminals12aand12b.The heat transmitted to the heat conduction member40is air-cooled via the surface of the heat conduction member40, and is transmitted to the lower case portion32via the lower surface. Accordingly, it is unlikely for the heat generated by the fuse element10to be transmitted to the substrate21. Moreover, the heat transmitted to the lower case portion32is dispersed throughout the lower case portion32and is air-cooled via the outer surface of the lower case portion32.

Accordingly, the electrical connection box100according to the present embodiment can prevent damage to the circuit element caused by a rise in the temperature of the substrate21, and can more effectively dissipate the heat generated by the circuit element.

In the above example, the end portions125aand125bof the terminals12aand12bof the fuse element10are bent and in contact with the upper surface of the heat conduction member40, and the lower surface of the heat conduction member40is in contact with the bottom plate321of the lower case portion32, but there is no limitation to this.

A configuration is possible in which the heat conduction member40is omitted, the end portions125aand125bof the terminals12aand12bare bent along the inward surface of the bottom plate321of the lower case portion32, and the bent end portions125aand125bare in direct contact with the bottom plate321.

Portions similar to those in the first and second embodiments are designated by the same reference numerals, and detailed description thereof will be omitted.

Fourth Embodiment

FIG.8is a view of a state in which the fuse element10according to a fourth embodiment has been mounted on the substrate21, as viewed from the front side of the fuse element10, andFIG.9is an arrow view taken along a line IX-IX inFIG.8.

In the electrical connection box100according to the fourth embodiment, first notches15are formed in each of the terminals12aand12bof the fuse element10. The first notches15are formed on both sides of the terminals12aand12bin a direction that intersects the bending direction of the terminals12aand12b,that is to say in the parallel direction of the terminals12aand12b(hereinafter simply called the “parallel direction”), in the vicinity of the end portions125aand125bof the terminals12aand12b.

Specifically, in the terminal12a,a first notch15is formed in each of two opposing surfaces121aand122athat oppose each other in the parallel direction, and in the terminal12b,a first notch15is formed in each of two opposing surfaces121band122bthat oppose each other in the parallel direction.

In the fuse element10according to the present embodiment, the terminals12aand12bare bent in a direction in which the end portions125aand125bin the extending direction thereof intersect the extending direction. Specifically, the end portions125aand125bof the terminals12aand12bare bent along the upper surface of the heat conduction member40. In this state, the fuse element10is electrically connected to the substrate21by soldering, for example.

At this time, the end portions125aand125bof the terminals12aand12bof the fuse element10are in elastic contact with the upper surface of the heat conduction member40. Also, for each of the end portions125aand125b,a contact portion S thereof corresponding to a predetermined range is in contact with the heat conduction member40.

Although one fuse element10among the plurality of fuse elements10has been described above as an example, in the other fuse elements10as well, first notches15are formed in the terminals12aand12b,and the end portions125aand125bare bent and in contact with the heat conduction member40.

Also, although the fuse element10has been described above as an example of a circuit element, the present disclosure is not limited to this. Similarly to the fuse element10, in the other circuit elements mounted on the substrate21, notches is formed in the terminals, and the end portions of the terminals are bent and in contact with the heat conduction member40.

Due to having the above configuration, the electrical connection box100according to the present embodiment can efficiently dissipate heat generated in the substrate structure20(substrate21) during operation.

In order to solve the above-mentioned problem of a rise in the temperature of the substrate during the operation of the electrical connection box, in the fuse element10of the electrical connection box100according to the present embodiment, the end portions125aand125bof the terminals12aand12bare bent along the upper surface of the heat conduction member40and are in elastic contact with the upper surface of the heat conduction member40. Accordingly, in the terminals12aand12b,the predetermined contact portion S is in contact with the upper surface of the heat conduction member40, and the lower surface of the heat conduction member40is in contact with the bottom plate321of the lower case portion32. Accordingly, the heat conduction path from the fuse element111, which is a heat generation source, to the heat conduction member40is shortened, and a wide area of contact between the heat conduction member40and the terminals12aand12bcan be ensured.

Accordingly, in the electrical connection box100according to the present embodiment, the heat generated by the fuse element10is even more quickly transmitted to the heat conduction member40via the terminals12aand12b.The heat transmitted to the heat conduction member40is transmitted to the lower case portion32via the lower surface of the heat conduction member40. Accordingly, it is unlikely for the heat generated by the fuse element10to be transmitted to the substrate21. The heat transmitted to the lower case portion32is air-cooled via the outer surface of the lower case portion32.

Also, the electrical connection box100according to the present embodiment can prevent damage to the circuit element caused by a rise in the temperature of the substrate21, and can more effectively dissipate the heat generated by the circuit element.

Also, in the electrical connection box100according to the present embodiment, the first notches15are formed in the terminals12aand12bas described above, and thus the end portions125aand125bcan be bent easily. Moreover, bending at the positions of the end portions125aand125bis guided due to the first notches15being formed in the vicinity of the end portions125aand125b. This therefore makes it possible to facilitate the operation of implementation in the electrical connection box100.

Portions similar to those in the first to third embodiments are designated by the same reference numerals, and detailed description thereof will be omitted.

Fifth Embodiment

FIG.10is a view of a state in which the fuse element10according to a fifth embodiment has been mounted on the substrate21, as viewed from the front side of the fuse element10, andFIG.11is an arrow view taken along a line XI-XI inFIG.10.

In the electrical connection box100according to the fifth embodiment, the second notches16are formed in the terminals12aand12bof the fuse element10. The second notches16are formed on both sides of the terminals12aand12bin in a direction that intersects the parallel direction of the terminals12aand12b,that is to say in the bending direction of the terminals12aand12b,in the vicinity of the end portions125aand125bof the terminals12aand12b.

Specifically, in the terminal12a,a second notch16is formed in each of two opposing surfaces123aand124athat oppose each other in the bending direction, and in the terminal12b,a second notch16is formed in each of two opposing surfaces123band124bthat oppose each other in the bending direction.

In the fuse element10according to the present embodiment as well, similarly to the fourth embodiment, the end portions125aand125bof the terminals12aand12bare bent. In this state, the fuse element10is electrically connected to the substrate21by soldering, for example.

At this time, the end portions125aand125bof the terminals12aand12bof the fuse element10are in elastic contact with the upper surface of the heat conduction member40. Also, for each of the end portions125aand125b,a contact portion S thereof corresponding to a predetermined range is in contact with the heat conduction member40.

Although one fuse element10among the plurality of fuse elements10has been described above as an example, in the other fuse elements10as well, second notches16are formed in the terminals12aand12b,and the end portions125aand125bare bent and in contact with the heat conduction member40.

Also, although the fuse element10has been described above as an example of a circuit element, the present disclosure is not limited to this. Similarly to the fuse element10, in the other circuit elements mounted on the substrate21, notches are formed in the terminals, and the end portions of the terminals are bent and in contact with the heat conduction member40.

Due to having the above configuration, the electrical connection box100according to the present embodiment can efficiently dissipate heat generated in the substrate structure20(substrate21) during operation.

In order to solve the above-mentioned problem of a rise in the temperature of the substrate during the operation of the electrical connection box, in the fuse element10of the electrical connection box100according to the present embodiment, the end portions125aand125bof the terminals12aand12bare bent along the upper surface of the heat conduction member40and are in elastic contact with the upper surface of the heat conduction member40. Accordingly, in the terminals12aand12b,the predetermined contact portion S is in contact with the upper surface of the heat conduction member40, and the lower surface of the heat conduction member40is in contact with the bottom plate321of the lower case portion32. Accordingly, the heat conduction path from the fuse element111, which is a heat generation source, to the heat conduction member40is shortened, and a wide area of contact between the heat conduction member40and the terminals12aand12bcan be ensured.

Accordingly, in the electrical connection box100according to the present embodiment, the heat generated by the fuse element10is even more quickly transmitted to the heat conduction member40via the terminals12aand12b.The heat transmitted to the heat conduction member40is transmitted to the lower case portion32. Accordingly, it is unlikely for the heat generated by the fuse element10to be transmitted to the substrate21. The heat transmitted to the lower case portion32is air-cooled via the outer surface of the lower case portion32.

Also, the electrical connection box100according to the present embodiment can prevent damage to the circuit element caused by a rise in the temperature of the substrate21, and can more effectively dissipate the heat generated by the circuit element.

Also, in the electrical connection box100according to the present embodiment, the second notches16are formed in the terminals12aand12bas described above, and thus the end portions125aand125bcan be bent easily. Moreover, bending at the positions of the end portions125aand125bis guided due to the second notches16being formed in the vicinity of the end portions125aand125b.This therefore makes it possible to facilitate the operation of implementation in the electrical connection box100.

Portions similar to those in the first to fourth embodiments are designated by the same reference numerals, and detailed description thereof will be omitted.

Note that the present disclosure is not limited to the above description. For example, a configuration is possible in which, with respect to the bending direction of the end portions125aand125b,a notch is formed in only the opposing surface123aof the terminal12a,and a notch is formed in only the opposing surface124bof the terminal12b.

Also, a configuration is possible in which, with respect to the bending direction of the end portions125aand125b,a notch is formed in only the opposing surface124aof the terminal12a,and a notch is formed in only the opposing surface123bof the terminal12b.

In these cases, the end portions125aand125bof the terminals12aand12bcan be guided to bend in opposite directions.

The embodiments disclosed herein are intended to be considered to be exemplary in all respects and not restrictive. The scope of the present disclosure is shown by the scope of claims, not the above-mentioned meaning, and is intended to include all modifications within the meaning and scope equivalent to the scope of claims.