Circuit protection member and electrical junction box

Abstract

The present invention is provided with: a conductive circuit protection member (21) which is a member for cutting off an overcurrent between an external power supply (B) and an external load (L1) between a power supply-side electric wire (WB) and a first load-side electric wire (WL1); a first terminal part (29a) of an additional circuit protection component (29) capable of cutting off overcurrent between an external power supply and an additional external load is electrically connected with the external power supply; and an additional load-side electrical connection structure (75B) capable of electrically connecting a second load-side electrical wire (WL2) electrically connected to an additional external load to a second terminal portion (29b) of the additional circuit protection member when the additional external load is added. The circuit protection member has an additional electrical connection part (25a) that physically and electrically connects the first terminal part and a connection part (25) that connects the additional electrical connection part and the power supply connection part (22), and is provided with at least one combination of the additional electrical connection part and the additional load-side electrical connection structure.

Description

Technical Field

[0001] The invention relates to a circuit protection component and an electrical connection box. Background Art

[0002] In an electrical connection box, a circuit protection component such as a fuse is interposed between an external power source and a load. The circuit protection component is provided with a circuit protection unit that cuts off the power supply between the external power source and the external load when an overcurrent flows. For example, the following patent document 1 discloses such an electrical connection box.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Publication No. 2014-93888 Summary of the invention

[0006] Technical problem that the invention aims to solve

[0007] In addition, the circuit protection component is sometimes disposed between the plurality of external loads and the external power supply by separately providing a circuit protection part for each of the plurality of external loads. For example, the conventional circuit protection component has a circuit protection member such as a bus bar, and the circuit protection member is provided with: a power connection part, which is electrically connected to a power supply side wire electrically connected to the external power supply; a load connection part provided for each external load, which is electrically connected to a load side wire electrically connected to the external load; and a fusible part as a circuit protection part, which is disposed between the power connection part and the load connection part for each external load. That is, the existing circuit protection component has a predetermined number of circuit protection parts, and cannot connect external loads added later.

[0008] Therefore, an object of the present invention is to provide a circuit protection component and an electrical connection box that can cope with the increase in external loads.

[0009] Technical solutions to the problem

[0010] The circuit protection component involved in the present invention is characterized in that it comprises: a conductive circuit protection member, the circuit protection member is a member that cuts off an overcurrent between the external power supply and the external load between a power supply side wire electrically connected to an external power supply and a first load side wire electrically connected to an external load, when an additional external load is added, the circuit protection member can electrically connect a first terminal portion of the additional circuit protection member to the external power supply, and the additional circuit protection member is used to cut off an overcurrent between the external power supply and the additional external load; and an additional load side electrical connection structure, when the additional external load is added, the additional load side electrical connection structure can connect the electrical connection The second load-side electric wire connected to the additional external load is electrically connected to the second terminal portion of the additional circuit protection component; the circuit protection component comprises: a power connection portion, which is electrically connected to the power-side electric wire; a load connection portion, which is electrically connected to the first load-side electric wire; a fusible portion, which is interposed between the power connection portion and the load connection portion; an additional electric connection portion, which is physically and electrically connected to the first terminal portion; and a connecting portion, which connects the additional electric connection portion to the power connection portion, and the circuit protection component is provided with at least one combination of the additional electric connection portion and the additional load-side electric connection structure.

[0011] In addition, the electrical connection box involved in the present invention is characterized in that it comprises: an electronic component; an internal conductive component, which electrically connects the electronic component to an external power supply; a frame, the frame having a barrel, the barrel being composed of a barrel wall with an opening at least at one end, and accommodating and holding the electronic component and the internal conductive component in the barrel of the barrel; a cover component, the cover component closing the opening of the barrel; and a circuit protection component, which cuts off an overcurrent between the external power supply and the external load, the internal conductive component having: a first electrical connection portion, the first electrical connection portion being physically and electrically connected to the electronic component in the barrel of the barrel; and a second electrical connection portion, the circuit protection component having: a conductive circuit protection member, the circuit protection member is a member that cuts off an overcurrent between the external power supply and the external load between a power supply side wire electrically connected to the external power supply and a first load side wire electrically connected to the external load, and the circuit protection member enables the addition of a circuit protection member The first terminal portion of the component is electrically connected to the external power supply, and the additional circuit protection component is used to cut off the overcurrent between the external power supply and the additional external load of the additional object; and an additional load-side electrical connection structure, the additional load-side electrical connection structure electrically connects the second load-side electric wire electrically connected to the additional external load and the second terminal portion of the additional circuit protection component; the circuit protection component comprises: a power connection portion, the power connection portion is electrically connected to the power supply side electric wire and is physically and electrically connected to the second electric connection portion of the internal conductive component; a load connection portion, the load connection portion is electrically connected to the first load-side electric wire; a fusible portion, the fusible portion is interposed between the power connection portion and the load connection portion; an additional electric connection portion, the additional electric connection portion is physically and electrically connected to the first terminal portion; and a connecting portion, the connecting portion connects the additional electric connection portion to the power connection portion, and the electrical connection box is provided with at least one combination of the additional electric connection portion and the additional load-side electrical connection structure.

[0012] Effects of the Invention

[0013] The circuit protection component of the present invention can be installed with an additional circuit protection component later, so when an additional external load of the additional object is added, the additional circuit protection component can be placed between the additional external load and the external power supply. Therefore, the circuit protection component can cope with the addition of the additional external load, and can cut off the overcurrent between the additional additional external load and the external power supply by the additional circuit protection component. In addition, the electrical connection box of the present invention is equipped with a circuit protection component corresponding to the addition of the additional external load, and can also achieve the effect of obtaining the circuit protection component. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a perspective view showing a circuit protection component and an electric connection box according to an embodiment.

[0015] Figure 2 This is a plan view of the circuit protection component and the electrical connection box (without the first cover member) according to the embodiment as viewed from one opening side of the frame.

[0016] Figure 3 This is a plan view of the circuit protection component and the electrical connection box (without the first cover member) according to the embodiment as seen from the side of the frame.

[0017] Figure 4 It is an exploded perspective view showing a circuit protection component and an electric junction box (without a first cover member and a second cover member) according to an embodiment.

[0018] Figure 5 It is an exploded perspective view showing a block and an internal conductive component and an external thread component housed in the block.

[0019] Figure 6 It is an exploded perspective view of the frame and the second cover member in the electrical junction box (without the first cover member) according to the embodiment.

[0020] Figure 7 This is an exploded perspective view illustrating the electrical connection structure between the circuit protection component and the load side.

[0021] Figure 8 This is a plan view of the electrical connection structure between the circuit protection component and the load side as viewed from the side of the frame of the electrical connection box, showing a state in which the additional circuit protection component is assembled.

[0022] Fig. 9 This is a plan view of the electrical connection structure between the circuit protection component and the load side as viewed from the side of the frame of the electrical connection box, showing a state in which the additional circuit protection component is removed.

[0023] Fig.10 It is a perspective view showing a circuit protection component.

[0024] Fig.11 yes Figure 3 XX line cross-sectional view.

[0025] Fig.12 It is a three-dimensional diagram showing a frame.

[0026] Fig.13 It is a perspective view showing the first divided cover.

[0027] Description of Reference Numerals

[0028] 1 Electrical connection box

[0029] 10 Electronic components

[0030] 20 Circuit protection components

[0031] 21 Circuit protection components

[0032] 22 Power connection

[0033] 22A First power connection

[0034] 22B Second power supply connection

[0035] 23 Load connection

[0036] 24 Fusible part

[0037] 25 Connection

[0038] 25a Additional electrical connection

[0039] 29 Add circuit protection components

[0040] 29a First terminal portion

[0041] 29b Second terminal portion

[0042] 40 Frames

[0043] 41 barrel

[0044] 41a an opening (opening)

[0045] 41c cylinder wall

[0046] 51 first cover member (cover member)

[0047] 60 Internal conductive parts

[0048] 60A First internal conductive part

[0049] 60B Second internal conductive part

[0050] 61 first electrical connection portion

[0051] 62 second electrical connection portion

[0052] 75B additional load side electrical connection structure

[0053] 76 External thread parts

[0054] 77 Internal thread parts

[0055] 78 Additional power supply side electrical connection structure

[0056] B External power supply

[0057] L1 External load

[0058] L2 Add external load

[0059] TB Power side terminal accessories

[0060] TL Load Side Terminal Accessories

[0061] WB Power supply side wire

[0062] WB1 First power supply side wire

[0063] WB2 Second power supply side wire

[0064] WL1 First load side wire

[0065] WL2 Second load side wire DETAILED DESCRIPTION

[0066] Hereinafter, embodiments of the circuit protection component and the electrical connection box according to the present invention will be described in detail based on the drawings. However, the present invention is not limited to the embodiments.

[0067] [Implementation Method]

[0068] based on Figures 1 to 13 One embodiment of a circuit protection component and an electric connection box according to the present invention will be described.

[0069] Figures 1 to 4 Reference numeral 1 denotes an electrical connection box of the present embodiment. The electrical connection box 1 is mounted on a vehicle such as an automobile, and is interposed between an external power source B such as a secondary battery in the vehicle and an external load L1 such as a power distribution object (for example, an auxiliary device to be powered), thereby supplying power from the external power source B to the external load L1 ( Figure 1 In addition, the electrical connection box 1 can also cope with an external load installed later on the vehicle, that is, an additional external load L2 to be added. When the additional external load L2 is added to the vehicle, the external power supply B is interposed between the external power supply B and the additional external load L2, thereby supplying power to the additional external load L2 ( Figure 1 ).

[0070] The electrical connection box 1 includes electronic components 10 such as relays and fuses. Figure 2 ), so that the electronic component 10 is interposed between the external power source B and the external load L1. In addition, when the external load L2 is added to the vehicle, the electrical connection box 1 is interposed between the external power source B and the additional external load L2. Furthermore, the electrical connection box 1 is provided with a circuit protection component 20 different from the fuse, so that the circuit protection component 20 is interposed between the external power source B and the external load L1 ( Figures 1 to 4). Moreover, when the external load L2 is added to the vehicle, the electrical connection box 1 also places the circuit protection component 20 between the external power source B and the added external load L2 ( Figures 1 to 4 ). The electrical connection box 1 includes a plurality of electronic components 10 and at least one circuit protection component 20 .

[0071] The electrical connection box 1 comprises: a block 30, which holds the electronic component 10; and a frame 40, which has a cylinder 41, the cylinder 41 is composed of a cylinder wall 41c with both ends (openings 41a, 41b) of the cylinder accommodating and holding the block 30 in the cylinder. Figures 1 to 6 ). In addition, the electrical connection box 1 includes: a cover member (hereinafter referred to as a "first cover member") 51 for closing an opening 41a in the barrel 41; and a cover member (hereinafter referred to as a "second cover member") 52 for closing the other opening 41b in the barrel 41 ( Figure 1 , Figure 3 and Figure 6 The block 30, the frame 40, the first cover member 51, and the second cover member 52 are formed of an insulating material such as synthetic resin.

[0072] In the electrical connection box 1, the frame 40, the first cover member 51 and the second cover member 52 form a box body, in which wires (not shown) electrically connected to the electronic components 10 are routed and led out of the box body through an opening.

[0073] In the frame 40, the block 30 is inserted into the cylinder of the cylinder 41 from the other opening 41b. When the frame 40 is composed of one cylinder 41, the outer wall constituting the outer frame thereof is entirely formed by the cylinder wall 41c of the cylinder 41. In addition, when the frame 40 is composed of a combination of a plurality of cylinders 41 whose opening directions of one opening 41a are respectively consistent and whose opening directions of another opening 41b are respectively consistent, the outer wall constituting the outer frame thereof is formed by a combination of a part of the cylinder walls 41c of the plurality of cylinders 41. That is, all or a part of the outer wall constituting the outer frame of the frame 40 is formed by the cylinder wall 41c of the cylinder 41.

[0074] The frame 40 shown here is composed of two cylinders 41, and is mounted on the vehicle in a manner such that one opening 41a faces upward. The first cover member 51 shown here is provided for each cylinder 41. In addition, the second cover member 52 shown here is divided into a first split cover 52A and a second split cover 52B that are assembled with each other, and the other openings 41b ( 41a ) of the two cylinders 41 are closed by assembling the first split cover 52A and the second split cover 52B. Figure 1 , Figure 3 as well as Figure 6 ).

[0075] The electrical connection box 1 electrically connects the electronic component 10 to the external power source B and includes an internal conductive member 60 ( Figure 4 and Figure 5 The internal conductive component 60 has a first electrical connection portion 61 ( ) which is physically and electrically connected to the electronic component 10 in the cylinder of the cylinder 41. Figure 5 The first electrical connection portion 61 is provided for each electronic component 10. In addition, the internal conductive component 60 has a second electrical connection portion 62 ( Figure 4 and Figure 5 In the internal conductive component 60, a plurality of first electrical connection parts 61 and a second electrical connection part 62 are connected via a connecting part 63 ( Figure 5 ).

[0076] Here, as described later, in the electrical connection box 1, the circuit protection component 20 is arranged outside the frame 40 outside the cylinder 41. Therefore, the internal conductive component 60 shown here is in the following shape: the connecting portion 63 is extended to the outside of the cylinder 41, and the second electrical connecting portion 62 is connected to the connecting portion 63 outside the frame 40 in the direction of the extension. That is, the second electrical connecting portion 62 shown here is arranged outside the cylinder 41 outside the frame 40.

[0077] The internal conductive component 60 is a so-called bus bar, and is formed into a plate shape using a metal plate as a base material, for example. The block 30 has a block body 31, and the block body 31 holds the electronic component 10 and the internal conductive component 60 ( Figure 1 , Figure 2 as well as Figures 4 to 6 ).

[0078] In addition, the electrical connection box 1 may also include a frame 40 that is integrated with the block 30. The frame 40 includes a cylinder 41, which is composed of a cylinder wall 41c having an opening 41a at least at one end, and contains and holds the electronic component 10 and the internal conductive component 60 in the cylinder. For example, as long as the frame 40 includes a cylinder 41 composed of a cylinder wall 41c with openings at both ends (openings 41a and 41b), the electrical connection box 1 includes a first cover member 51 and a second cover member 52 as in the previous example. On the other hand, if the frame 40 includes a cylinder 41 composed of a cylinder wall 41c with only an opening 41a (that is, a cylinder 41 with an opening 41b closed), the electrical connection box 1 includes only the first cover member 51.

[0079] The circuit protection component 20 is a component provided in the electrical connection box 1 in order to cut off the overcurrent between the external power source B and the external load L1. Moreover, the circuit protection component 20 is configured to cut off the overcurrent between the external power source B and the additional external load L2 when the additional external load L2 is added to the vehicle. The circuit protection component 20 can be arranged inside the cylinder of the cylinder 41, or outside the cylinder of the cylinder 41 and outside the frame 40. The circuit protection component 20 shown here is arranged outside the cylinder of the cylinder 41 and outside the frame 40.

[0080] The circuit protection component 20 includes a conductive circuit protection member 21, which is a member interposed between a power supply side wire WB electrically connected to an external power supply B and a first load side wire WL1 electrically connected to an external load L1, and cuts off an overcurrent between the external power supply B and the external load L1 between the power supply side wire WB and the first load side wire WL1. Figure 4 and Figures 7 to 10 ). The circuit protection member 21 is provided to cut off the overcurrent between the external power source B and at least one external load L1. The circuit protection member 21 shown here is provided to cut off the overcurrent between the external power source B and four external loads L1, and has four sets of combinations of load connection parts 23 and fusible parts 24 described below.

[0081] The circuit protection member 21 has a power supply connection portion 22 ( Figure 4 , Figure 7 as well as Fig.10 The power connection portion 22 shown here is physically and electrically connected to the power supply side terminal fitting TB at the end of the power supply side electric wire WB and the second electrical connection portion 62 of the internal conductive member 60 .

[0082] In addition, the circuit protection member 21 has: a load connection portion 23, which is electrically connected to the first load-side wire WL1; and a fusible portion 24, which is interposed between the power connection portion 22 and the load connection portion 23 and melts when an overcurrent flows ( Figure 7 and Fig.10 In the circuit protection member 21, the load connection portion 23 and the fusible portion 24 are provided for each external load L1. In addition, the circuit protection member 21 has a connection portion 25 ( Fig.10 The power supply connection portion 22 and the fusible portion 24 for each external load L1 are connected to the connection portion 25 .

[0083] The circuit protection member 21 is a so-called bus bar, and is formed into a plate shape using a metal plate as a base material, for example. In the circuit protection component 20, a resin portion 26 ( Figure 4 and Figures 7 to 9 ). In addition, in the circuit protection component 20, a transparent resin cover 27 made of a synthetic resin material that covers the exposed fusible portion 24 is assembled to the resin portion 26 ( Figure 4 and Figures 7 to 9 ).

[0084] The circuit protection component 20 includes a power supply side electrical connection structure 70 ( Figure 2 , Figure 4 , Figure 5 and Fig.11 ). The power supply side electrical connection structure 70 is arranged outside the frame 40 outside the barrel of the barrel portion 41. Therefore, the power supply side electrical connection structure 70 electrically connects the power supply side wire WB, the internal conductive component 60, and the circuit protection member 21 outside the frame 40. The power supply side electrical connection structure 70 shown here physically and electrically connects the power supply side terminal fitting TB at the end of the power supply side wire WB, the second electrical connection portion 62 of the internal conductive component 60, and the power supply connection portion 22 of the circuit protection member 21 outside the frame 40.

[0085] The power supply side electrical connection structure 70 adopts a connection structure that physically connects the power supply side terminal fitting TB at the end of the power supply side electric wire WB to the second electrical connection part 62 of the internal conductive component 60 and the power supply connection part 22 of the circuit protection member 21. The power supply side electrical connection structure 70 shown here is a connection structure that physically connects the power supply side terminal fitting TB to the second electrical connection part 62 and the power supply connection part 22 so that it can be freely loaded and unloaded, and includes an external thread component 71, a thread holding component 72 that holds the external thread component 71 in a state where the external thread part is exposed, and an internal thread component 73 that is screwed with the external thread part of the external thread component 71 ( Figure 4 , Figure 5 as well as Fig.11 The power supply side electrical connection structure 70 is formed by inserting the external thread portion of the external thread component 71 into the through holes TBa, 62a, 22a respectively provided in the power supply side terminal fitting TB, the second electrical connection portion 62 of the internal conductive component 60 and the power supply connection portion 22 of the circuit protection member 21, and screwing the internal thread component 73 with the external thread portion, thereby fastening and fixing the power supply side terminal fitting TB, the second electrical connection portion 62 of the internal conductive component 60 and the power supply connection portion 22 of the circuit protection member 21 together ( Figure 4 and Figure 5That is, the power supply side electrical connection structure 70 is a common fastening and fixing structure in which the power supply side terminal fitting TB, the second electrical connection portion 62 and the power supply connection portion 22 are screwed together by the external thread component 71 and the internal thread component 73 .

[0086] Here, in the power supply side electrical connection structure 70, the external thread component 71 is configured in such a manner that the thread axis of the external thread portion is aligned with the vertical direction (i.e., the vertical direction of the vehicle) and the external thread portion protrudes from the thread retaining component 72 toward the vertical upper side (i.e., above the vehicle).

[0087] In addition, the circuit protection component 20 includes a load-side electrical connection structure 75A ( Figure 3 , Figure 4 and Figures 7 to 9 ). The load-side electrical connection structure 75A is arranged outside the frame 40 outside the cylinder of the cylinder portion 41. Therefore, the load-side electrical connection structure 75A electrically connects the first load-side wire WL1 and the circuit protection member 21 outside the frame 40. A load-side terminal fitting TL ( Figure 3 and Figures 7 to 9 The load-side electrical connection structure 75A physically and electrically connects the load-side terminal fitting TL and the load connection portion 23 of the circuit protection member 21 outside the frame 40. When there are a plurality of external loads L1, the load-side electrical connection structure 75A is provided for each external load L1.

[0088] The load-side electrical connection structure 75A is a connection structure that physically connects the load-side terminal fitting TL at the end of the first load-side electric wire WL1 to the load connection portion 23 of the circuit protection member 21. The load-side electrical connection structure 75A shown here is a connection structure that physically connects the load-side terminal fitting TL to the load connection portion 23 so that it can be freely attached and detached, and includes an external thread component 76 and an internal thread component 77 ( Figure 7 In the external thread component 76, the external thread portion of the external thread component 76 is inserted into the through hole 23a of the load connecting portion 23 of the circuit protection member 21 ( Figure 8 ) and the resin portion 26 is integrally formed in a state where the external thread portion is exposed. The load-side electrical connection structure 75A is formed by inserting the external thread portion of the external thread component 76 into the through hole TLa provided in the load-side terminal fitting TL and screwing the internal thread component 77 with the external thread portion, thereby fastening and fixing the load-side terminal fitting TL and the load connection portion 23 of the circuit protection member 21 together ( Figure 7That is, the load-side electrical connection structure 75A is a common fastening and fixing structure in which the load-side terminal fitting TL and the load connecting portion 23 are screwed and fixed by the external thread member 76 and the internal thread member 77 .

[0089] Here, in the load-side electrical connection structure 75A, the external thread member 76 ( Figure 4 and Figures 6 to 9 For example, the tube wall 41c of the tube portion 41 has an opposing wall body 41f ( Figure 2 , Figure 4 , Figure 5 , Fig.11 and Fig.12 ). In the electrical connection box 1, the circuit protection component 20 is configured in a state where the load connection portion 23 is exposed on the side opposite to the opposing wall body 41f side. And, in the load-side electrical connection structure 75A, the external thread component 76 is configured in a form where the external thread portion protrudes from the through hole 23a of the load connection portion 23 to the side opposite to the opposing wall body 41f side. That is, the load-side electrical connection structure 75A is a connection structure that allows the load-side terminal fitting TL at the end of the first load-side electric wire WL1 to be physically connected to the load connection portion 23 of the circuit protection member 21 on the side opposite to the opposing wall body 41f side (in other words, a visible portion outside the frame 40) in a freely loadable and removable manner, and they can be threadedly fastened and fixed by the external thread component 76 and the internal thread component 77 on the side opposite to the opposing wall body 41f side. Therefore, the load-side electrical connection structure 75A can load and remove the internal thread component 77 relative to the external thread component 76 when the circuit protection component 20 is assembled to the frame 40, so that the first load-side electric wire WL1 with the load-side terminal fitting TL can be loaded and unloaded relative to the load connection portion 23 of the circuit protection member 21.

[0090] In this example, the external thread member 76 is arranged so that the thread axis of the external thread portion coincides with the orthogonal direction to the vertical direction (ie, the vehicle up-down direction) and the external thread portion protrudes toward the side opposite to the facing wall body 41f.

[0091] In addition, as long as the first load-side electric wire WL1 with the load-side terminal fitting TL is not loaded or unloaded when the circuit protection component 20 is assembled to the frame 40, the load-side electrical connection structure 75A can also be configured with the external threaded component 76 (not shown) in a form in which the external threaded portion protrudes toward the barrel wall 41c side (i.e., the opposing wall 41f side) of the barrel 41.

[0092] Considering that an additional external load L2 is added to the vehicle, in order to cut off the overcurrent between the external power source B and the additional external load L2, the circuit protection component 20 is configured to have an additional circuit protection component 29 ( Figures 1 to 4 as well as Figures 6 to 9 ) structure. The additional circuit protection component 29 is a circuit protection component that can be freely installed and removed relative to the circuit protection component 20, and a circuit protection component such as a fusible part (not shown) is interposed between a first terminal part 29a at one end and a second terminal part 29b at the other end. In the additional circuit protection component 29, the first terminal part 29a, the second terminal part 29b and the circuit protection part are provided on a plate-shaped circuit protection member such as a bus bar.

[0093] First, the circuit protection member 21 is configured to enable the first terminal portion 29a of the additional circuit protection component 29 to be electrically connected to the external power source B ( Figures 1 to 4 as well as Figures 6 to 9 The circuit protection member 21 has an additional electrical connection portion 25a ( ) which is physically and electrically connected to the first terminal portion 29a of the additional circuit protection component 29. Figures 7 to 10 ). In the circuit protection member 21, the additional electrical connection portion 25a is connected to the power connection portion 22, so that the additional electrical connection portion 25a is electrically connected to the external power supply B. Here, the additional electrical connection portion 25a is provided in the connection portion 25, so that the additional electrical connection portion 25a is exposed from the resin portion 26. Moreover, here, on the basis of exposing the additional electrical connection portion 25a to the outside, in order to physically and electrically connect the first terminal portion 29a of the additional circuit protection component 29 to the additional electrical connection portion 25a, a cutout portion 27a is provided in the resin cover 27 ( Figures 7 to 9 ).

[0094] The circuit protection component 20 includes an additional power supply side electrical connection structure 78, and when an additional external load L2 is added, the additional power supply side electrical connection structure 78 can electrically connect the first terminal portion 29a of the additional circuit protection component 29 corresponding to the additional external load L2 to the circuit protection member 21 ( Figure 3 , Figure 4 as well as Figures 7 to 9). The additional power supply side electrical connection structure 78 is arranged outside the tube of the tube portion 41 and outside the frame 40. Therefore, the additional power supply side electrical connection structure 78 electrically connects the first terminal portion 29a of the additional circuit protection component 29 and the circuit protection member 21 outside the frame 40. The additional power supply side electrical connection structure 78 shown here physically and electrically connects the first terminal portion 29a of the additional circuit protection component 29 and the additional electrical connection portion 25a of the circuit protection member 21 outside the frame 40. In the case where there are multiple additional external loads L2, the additional power supply side electrical connection structure 78 is provided for each of the additional external loads L2.

[0095] The additional power supply side electrical connection structure 78 adopts a connection structure that allows the first terminal portion 29a of the additional circuit protection component 29 to be detachably physically connected to the additional electrical connection portion 25a of the circuit protection member 21. The additional power supply side electrical connection structure 78 shown here includes the same external thread component 76 and internal thread component 77 as the load side electrical connection structure 75A ( Figures 7 to 9 The external thread portion of the external thread member 76 is inserted into the through hole 25b of the additional electrical connection portion 25a ( Fig.10 The resin portion 26 is integrally formed with the external thread member 76 and the additional electrical connection portion 25a while the additional electrical connection portion 25a is exposed and the external thread portion of the external thread member 76 inserted through the through hole 25b of the additional electrical connection portion 25a is exposed.

[0096] The additional power supply side electrical connection structure 78 is formed by inserting the external thread portion of the external thread component 76 into the through hole 29c of the first terminal portion 29a of the additional circuit protection component 29, and screwing the internal thread component 77 with the external thread portion, thereby fastening and fixing the first terminal portion 29a and the additional electrical connection portion 25a of the circuit protection component 21 together ( Figure 7 That is, the additional power source side electrical connection structure 78 is a common fastening and fixing structure in which the first terminal portion 29 a and the additional electrical connection portion 25 a are screwed together by the external thread member 76 and the internal thread member 77 .

[0097] Next, the circuit protection component 20 includes an additional load-side electrical connection structure 75B, which can electrically connect the second load-side wire WL2 electrically connected to the additional external load L2 and the second terminal portion 29b of the additional circuit protection component 29 when the additional external load L2 is added ( Figure 3 , Figure 4 as well as Figures 7 to 9). The additional load-side electrical connection structure 75B is arranged outside the frame 40 outside the cylinder 41. Therefore, the additional load-side electrical connection structure 75B electrically connects the second load-side wire WL2 and the second terminal portion 29b of the additional circuit protection component 29 outside the frame 40. A load-side terminal fitting TL ( Figure 3 and Figures 7 to 9 The additional load side electrical connection structure 75B physically and electrically connects the load side terminal fitting TL and the second terminal portion 29b outside the frame 40. When there are a plurality of additional external loads L2, the additional load side electrical connection structure 75B is provided for each of the additional external loads L2.

[0098] The additional load-side electrical connection structure 75B adopts a connection structure that allows the load-side terminal fitting TL at the end of the second load-side electric wire WL2 to be detachably physically connected to the second terminal portion 29b of the additional circuit protection component 29. The additional load-side electrical connection structure 75B shown here has the same external thread component 76 and internal thread component 77 as the load-side electrical connection structure 75A ( Figure 7 and Figure 8 The external threaded portion of the external threaded component 76 is inserted through the through hole TLa of the load-side terminal fitting TL of the second load-side electric wire WL2 and the through hole 29d of the second terminal portion 29b. The additional load-side electrical connection structure 75B includes a plate-shaped additional conductive component 79, which has a through hole 79a for the external threaded portion of the external threaded component 76 to be inserted through, and the additional conductive component 79 is in surface contact with one of the load-side terminal fitting TL and the second terminal portion 29b whose external threaded portion is inserted through the through hole TLa, 29d ( Figures 7 to 9 The resin portion 26 is integrally formed with the external thread member 76 and the additional conductive member 79. The resin portion 26 is integrally formed with the external thread member 76 and the additional conductive member 79 in a state where the contact surface of the additional conductive member 79 that is in surface contact with the load-side terminal fitting TL or the second terminal portion 29b is exposed and the external thread portion of the external thread member 76 inserted into the through hole 79a of the additional conductive member 79 is exposed.

[0099] The additional load-side electrical connection structure 75B is configured such that the external threaded portion of the external threaded member 76 is inserted into the through hole 29d of the second terminal portion 29b of the additional circuit protection member 29, and the external threaded portion is inserted into the through hole TLa of the load-side terminal fitting TL of the second load-side electric wire WL2, and the internal threaded member 77 is screwed into the external threaded portion, thereby fastening and fixing the load-side terminal fitting TL and the second terminal portion 29b of the additional circuit protection member 29 together ( Figure 7That is, the additional load-side electrical connection structure 75B is a common fastening and fixing structure in which the load-side terminal fitting TL and the second terminal portion 29 b are screwed together by the external thread member 76 and the internal thread member 77 .

[0100] Here, in the additional power supply side electrical connection structure 78 and the additional load side electrical connection structure 75B, the external thread member 76 ( Figure 4 and Figures 6 to 9 ). In the electrical connection box 1, the circuit protection component 20 is configured in a state where the additional electrical connection portion 25a and the additional conductive component 79 are exposed on the side opposite to the opposing wall 41f. Moreover, in the additional power supply side electrical connection structure 78, the external thread component 76 is configured in a form where the external thread portion protrudes from the through hole 25b of the additional electrical connection portion 25a to the side opposite to the opposing wall 41f. That is, the additional power supply side electrical connection structure 78 is a connection structure that allows the first terminal portion 29a of the additional circuit protection component 29 to be physically connected to the additional electrical connection portion 25a of the circuit protection member 21 on the side opposite to the opposing wall 41f (in other words, a visible portion outside the frame 40) in a detachable manner, and they can be threadedly fastened by the external thread component 76 and the internal thread component 77 on the side opposite to the opposing wall 41f. In the additional load-side electrical connection structure 75B, the external thread member 76 is arranged in a form in which the external thread portion protrudes from the through hole 79a of the additional conductive member 79 to the side opposite to the opposing wall body 41f side. That is, the additional load-side electrical connection structure 75B is a connection structure that allows the load-side terminal fitting TL at the end of the second load-side electric wire WL2 and the second terminal portion 29b of the additional circuit protection component 29 to be detachably physically connected to the additional conductive member 79 on the side opposite to the opposing wall body 41f side (in other words, a visible portion outside the frame 40), and the load-side terminal fitting TL and the second terminal portion 29b can be screwed together with the additional conductive member 79 on the side opposite to the opposing wall body 41f side by the external thread member 76 and the internal thread member 77. Therefore, the additional power supply side electrical connection structure 78 and the additional load side electrical connection structure 75B respectively perform loading and unloading of the internal thread component 77 relative to the external thread component 76 when the circuit protection component 20 is assembled to the frame 40, thereby enabling the second load side electric wire WL2 with the load side terminal accessory TL and the additional circuit protection component 29 to be loaded and unloaded relative to the circuit protection component 20.

[0101] In the additional power supply side electrical connection structure 78 and the additional load side electrical connection structure 75B of this example, the external thread component 76 is configured in a manner such that the thread axis of each external thread portion is consistent with an orthogonal direction relative to the vertical direction (i.e., the up and down direction of the vehicle), and each external thread portion protrudes toward the side opposite to the opposing wall body 41f.

[0102] In the circuit protection component 20, at least one combination of an additional electrical connection portion 25a and an additional load-side electrical connection structure 75B (in other words, a combination of an additional power supply-side electrical connection structure 78 and an additional load-side electrical connection structure 75B) is provided. That is, in the circuit protection component 20, when there is only one additional external load L2 to be added, it is sufficient to provide a combination of an additional electrical connection portion 25a and an additional load-side electrical connection structure 75B (a combination of an additional power supply-side electrical connection structure 78 and an additional load-side electrical connection structure 75B). On the other hand, in the circuit protection component 20, when a plurality of additional external loads L2 to be added are predetermined, it is sufficient to provide a combination of an additional electrical connection portion 25a and an additional load-side electrical connection structure 75B (a combination of an additional power supply-side electrical connection structure 78 and an additional load-side electrical connection structure 75B) greater than the predetermined number.

[0103] In addition, here, from the viewpoint of commonality of parts, the additional power supply side electrical connection structure 78 and the additional load side electrical connection structure 75B are provided with the same external thread member 76 and internal thread member 77 as the load side electrical connection structure 75A, but the additional power supply side electrical connection structure 78 and the additional load side electrical connection structure 75B may be constituted by external thread members and internal thread members different from these. In addition, here, from the viewpoint of commonality of parts, the same load side terminal fitting TL as the first load side wire WL1 is attached to the second load side wire WL2, but a load side terminal fitting different from the load side terminal fitting TL of the first load side wire WL1 may be attached to the end of the second load side wire WL2.

[0104] Specifically, the circuit protection component 20 is arranged outside the frame 40 in the following manner.

[0105] The frame 40 has a recessed portion 42 ( Figures 2 to 4 and Fig.12 The recess 42 is preferably formed to have a volume equal to or larger than the size of the circuit protection component 20 and to be able to accommodate the circuit protection component 20 without causing the circuit protection component 20 to protrude.

[0106] In addition, the frame 40 has a sub-tube portion 43, which is provided with an opening 43a, which opens in the same direction as an opening 41a in the tube portion 41, and is formed to bulge from the tube wall 41c of the tube portion 41 to the outside of the frame 40 ( Figures 1 to 4 , Figure 6 , Fig.11 as well as Fig.12 ). The secondary cylinder portion 43 is disposed in the recess 42 of the frame 40. The secondary cylinder portion 43 shown here is formed as a cylinder with openings at both ends (openings 43a, 43b). Therefore, in the secondary cylinder portion 43, one opening 43a is arranged on the side of one opening 41a of the cylinder portion 41, and the other opening 43b is arranged on the side of the other opening 41b of the cylinder portion 41.

[0107] A power supply side electrical connection structure 70 is provided in the cylinder of the secondary cylinder portion 43. In the secondary cylinder portion 43, the threaded retaining component 72 of the power supply side electrical connection structure 70 is accommodated in the cylinder, and the external threaded portion of the external threaded component 71 in the power supply side electrical connection structure 70 is made to protrude from an opening 43a. Therefore, the second electrical connection portion 62 of the internal conductive component 60 makes the external threaded portion of the external threaded component 71 protruding from an opening 43a of the secondary cylinder portion 43 be inserted into the through hole 62a on the side of an opening 41a of the cylinder portion 41 closer to the one opening 43a. Therefore, the cylinder wall 41c of the cylinder portion 41 has a cutout 44 ( Figure 4 and Fig.11 The cutout 44 is a cutout formed by cutting the tube wall 41 c of the tube portion 41 from the end portion on the other opening 41 b side toward the one opening 41 a , and is cut to the one opening 41 a side of the tube portion 41 relative to the one opening 43 a of the secondary tube portion 43 .

[0108] The block 30 has a protruding block portion 32 ( 40 ) which protrudes from the notch 44 to the outside of the cylinder 41 and is received in the cylinder of the secondary cylinder 43. Figure 4 and Figure 5 ). A screw holding member 72 is assembled to the protruding block portion 32, thereby holding the power supply side electrical connection structure 70.

[0109] In the electrical connection box 1, the external threaded portion of the external threaded member 71 of the power-side electrical connection structure 70 is inserted into the through hole 62a of the second electrical connection portion 62 of the internal conductive member 60, while the internal conductive member 60 is held in the block body 31 and the power-side electrical connection structure 70 is held in the protruding block portion 32. In the electrical connection box 1, the block body 31 holding the internal conductive member 60 is inserted into the cylinder of the cylinder portion 41 from the other opening 41b, and the protruding block portion 32 holding the power-side electrical connection structure 70 is inserted into the cylinder of the sub-cylindrical portion 43 from the other opening 43b together with the second electrical connection portion 62 of the internal conductive member 60. In the electrical connection box 1, the protruding block portion 32, the power-side electrical connection structure 70, and the second electrical connection portion 62 of the internal conductive member 60 are accommodated in the cylinder of the sub-cylindrical portion 43, while the external threaded portion of the external threaded member 71 is extended from one opening 43a of the sub-cylindrical portion 43.

[0110] In the electrical connection box 1, the external thread portion of the external thread component 71 is inserted into the through hole 22a to assemble the power connection portion 22 of the circuit protection member 21 to the power side electrical connection structure 70, and further, the external thread portion of the external thread component 71 is inserted into the through hole TBa to assemble the power side terminal fitting TB to the power side electrical connection structure 70. In addition, in the electrical connection box 1, the internal thread component 73 is screwed into the external thread portion of the external thread component 71 to fasten and fix the power side terminal fitting TB, the second electrical connection portion 62 of the internal conductive component 60, and the power connection portion 22 of the circuit protection member 21 together. In the electrical connection box 1, the power side terminal fitting TB and the circuit protection member 20 are assembled to the block 30 via the power side electrical connection structure 70.

[0111] One opening 43a of the secondary barrel 43 is covered by the first cover member 51 assembled to the frame 40 together with the power supply side terminal fitting TB, the second electrical connection portion 62 of the internal conductive member 60, the power supply connection portion 22 of the circuit protection member 21, and the power supply side electrical connection structure 70, and is accommodated in the first cover member 51. In addition, the first cover member 51 covers the recessed portion 42 of the frame 40, and the circuit protection component 20 in the recessed portion 42 is accommodated in the space between the first cover member 51 and the recessed portion 42.

[0112] The other opening 43b of the secondary cylinder portion 43 is closed by a closing portion 53 provided on a second cover member 52 assembled to the frame 40 so as not to be exposed to the outside of the frame 40 ( Figure 1 , Figure 3 , Figure 6 as well as Fig.13 ).

[0113] In the electrical connection box 1, all the core wires of the power supply side wire WB, the first load side wire WL1, and the second load side wire WL2 may be formed of copper or a copper alloy. However, in order to achieve weight reduction, it is preferred that at least one of the core wires of the power supply side wire WB, the first load side wire WL1, and the second load side wire WL2 be formed of aluminum or an aluminum alloy. For example, the power supply side wire WB, the first load side wire WL1, and the second load side wire WL2 may have all their core wires formed of aluminum or an aluminum alloy, or at least one of the core wires may be formed of aluminum or an aluminum alloy, and the remaining core wires may be formed of copper or a copper alloy.

[0114] When the core wires of the power-side wire WB, the first load-side wire WL1, and the second load-side wire WL2 are formed of aluminum or aluminum alloy, they can be made lighter than when the core wires are formed of copper or copper alloy, but they become thicker and harder to bend due to the large current. However, in the electrical connection box 1, the circuit protection component 20 is arranged outside the frame 40 outside the barrel of the barrel 41, and the power-side wire WB, the first load-side wire WL1, etc., which are difficult to bend, are arranged outside the frame 40. Therefore, the electrical connection box 1 can suppress the overload of the power-side wire WB, etc. on the periphery in the box body, and can also improve the accommodation of other wires in the barrel of the barrel 41.

[0115] Specifically, the electrical connection box 1 shown here includes a first internal conductive component 60A and a second internal conductive component 60B as the internal conductive component 60, and the first internal conductive component 60A and the second internal conductive component 60B are held by the block 30 ( Figure 4 and Figure 5 Here, two types of first internal conductive components 60A are provided as the internal conductive components 60 .

[0116] In addition, the circuit protection member 21 shown here includes a first power connection portion 22A and a second power connection portion 22B as the power connection portion 22, and the first power connection portion 22A and the second power connection portion 22B are electrically connected to the first power side wire WB1 and the second power side wire WB2 as the power side wire WB, respectively ( Figure 4 , Figure 7 as well as Fig.10). In the circuit protection member 21, the first power connection part 22A and the second power connection part 22B are connected by the connection part 25, and the fusible part 24 is connected to the first power connection part 22A and the second power connection part 22B via the connection part 25. That is, the fusible part 24 is interposed between the first power connection part 22A and the load connection part 23, and between the second power connection part 22B and the load connection part 23. Moreover, in the circuit protection member 21, since the additional electrical connection part 25a is provided in the connection part 25, the additional electrical connection part 25a is connected to the first power connection part 22A and the second power connection part 22B.

[0117] When viewed from the circuit protection member 21, the first power supply side wire WB1 is interposed between the first power supply connection portion 22A and the external power supply B, and electrically connects the first power supply connection portion 22A to the external power supply B. In addition, the second power supply side wire WB2 is electrically connected to an external electrical component P such as an AC generator and a DC-DC converter disposed outside the case, and is electrically connected to the external power supply B via the circuit protection member 21 and the first power supply side wire WB1. That is, the second power supply side wire WB2 electrically connects the external electrical component P to the external power supply B via the circuit protection member 21 and the first power supply side wire WB1.

[0118] The first power connection portion 22A is electrically connected to the first power side wire WB1, and is physically and electrically connected to the second electrical connection portion 62 of the first internal conductive component 60A. The electrical connection box 1 includes a first power side electrical connection structure 70A as a power side electrical connection structure 70 ( Figures 2 to 5 and Fig.11 ). The first power supply side electrical connection structure 70A is configured such that the external threaded portion of the external threaded component 71 is inserted through the through holes TBa, 62a, 22a of the power supply side terminal fitting TB at the end of the first power supply side wire WB1, the second electrical connection portion 62 of the first internal conductive component 60A, and the first power connection portion 22A of the circuit protection member 21, and the internal threaded component 73 is screwed into the external threaded portion, thereby fastening and fixing the power supply side terminal fitting TB, the second electrical connection portion 62 of the first internal conductive component 60A, and the first power connection portion 22A of the circuit protection member 21 together. Here, the power supply side terminal fitting TB, the second electrical connection portions 62 of the two first internal conductive components 60A, and the first power connection portion 22A of the circuit protection member 21 are fastened and fixed together.

[0119] The frame 40 shown here has a first sub-tube portion 43A as the sub-tube portion 43, and the first sub-tube portion 43A is provided with an opening (one opening 43a) that opens in the same direction as the one opening 41a of the tube portion 41 ( Figures 1 to 4 , Figure 6 as well as Fig.12 ). The first sub-cylinder portion 43A accommodates the first power supply side electrical connection structure 70A in the cylinder, and makes the external thread portion of the external thread component 71 in the first power supply side electrical connection structure 70A protrude from an opening 43a. The first sub-cylinder portion 43A is set in the recess 42 of the frame 40. A first cutout 44A is provided as the cutout 44 on the cylinder wall 41c of the cylinder portion 41, and the first cutout 44A makes the inside of the cylinder of the cylinder portion 41 communicate with the inside of the cylinder of the first sub-cylinder portion 43A, and makes the second electrical connection portion 62 of the first internal conductive component 60A protrude outside the cylinder of the cylinder portion 41 to the outside of the frame 40 ( Figure 4 ). In addition, the block 30 is provided with a first protruding block portion 32A as a protruding block portion 32 for assembling the threaded retaining member 72 of the first power supply side electrical connection structure 70A. The first protruding block portion 32A protrudes from the first cutout 44A to the outside of the cylinder 41 and is received in the cylinder of the first sub-cylinder portion 43A ( Figure 4 and Figure 5 ).

[0120] In the electrical connection box 1, the first protruding block portion 32A, the first power supply side electrical connection structure 70A and the second electrical connection portions 62 of the two first internal conductive components 60A are accommodated in the cylinder of the first sub-cylinder portion 43A while the external thread portion of the external thread component 71 is extended from an opening 43a of the first sub-cylinder portion 43A.

[0121] The second power connection portion 22B is electrically connected to the second power supply side wire WB2, and is physically and electrically connected to the second electrical connection portion 62 of the second internal conductive component 60B. The electrical connection box 1 includes a second power supply side electrical connection structure 70B as a power supply side electrical connection structure 70 ( Figures 2 to 5 The second power supply side electrical connection structure 70B is configured such that the external threaded portion of the external threaded component 71 is inserted through the through holes TBa, 62a, 22a of the power supply side terminal fitting TB at the end of the second power supply side wire WB2, the second electrical connection portion 62 of the second internal conductive component 60B, and the second power supply connection portion 22B of the circuit protection component 21, and the internal threaded component 73 is screwed into the external threaded portion, thereby fastening and fixing the power supply side terminal fitting TB, the second electrical connection portion 62 of the second internal conductive component 60B, and the second power supply connection portion 22B of the circuit protection component 21 together.

[0122] The frame 40 shown here has a second sub-tube portion 43B as the sub-tube portion 43, and the second sub-tube portion 43B is provided with an opening (one opening 43a) opening in the same direction as the one opening 41a of the tube portion 41 ( Figures 1 to 4 , Figure 6 as well as Fig.12 ). The second sub-cylinder portion 43B accommodates the second power supply side electrical connection structure 70B in the cylinder, and makes the external thread portion of the external thread component 71 in the second power supply side electrical connection structure 70B protrude from an opening 43a. The second sub-cylinder portion 43B is arranged in the recess 42 of the frame 40. A second cutout 44B is provided as the cutout 44 on the cylinder wall 41c of the cylinder portion 41, and the second cutout 44B makes the inside of the cylinder of the cylinder portion 41 communicate with the inside of the cylinder of the second sub-cylinder portion 43B, and makes the second electrical connection portion 62 of the second internal conductive component 60B protrude outside the cylinder of the cylinder portion 41 to the outside of the frame 40 ( Figure 4 ). In addition, the block 30 is provided with a second protruding block portion 32B as a protruding block portion 32 of the threaded retaining member 72 assembled with the second power supply side electrical connection structure 70B, and the second protruding block portion 32B protrudes from the second notch 44B to the outside of the cylinder 41 and is accommodated in the cylinder of the second sub-cylinder portion 43B ( Figure 4 and Figure 5 ).

[0123] In the electrical connection box 1, the second protruding block portion 32B, the second power supply side electrical connection structure 70B and the second electrical connection portion 62 of the second internal conductive component 60B are accommodated in the cylinder of the second sub-cylinder portion 43B while the external thread portion of the external thread component 71 is extended from an opening 43a of the second sub-cylinder portion 43B.

[0124] In the electrical connection box 1, the external threaded portion of the external threaded member 71 of the first power supply side electrical connection structure 70A is inserted into the through hole 22a of the first power supply side electrical connection part 22A to assemble the first power supply side electrical connection part 22A to the first power supply side electrical connection structure 70A, and the external threaded portion of the external threaded member 71 of the second power supply side electrical connection structure 70B is inserted into the through hole 22a of the second power supply side electrical connection part 22B to assemble the second power supply side electrical connection part 22B to the second power supply side electrical connection structure 70B. In addition, in the electrical connection box 1, the external threaded portion of the external threaded member 71 of the first power supply side electrical connection structure 70A is inserted into the through hole TBa of the power supply side terminal fitting TB of the first power supply side wire WB1 to assemble the power supply side terminal fitting TB to the first power supply side electrical connection structure 70A, and the external threaded portion of the external threaded member 71 of the second power supply side electrical connection structure 70B is inserted into the through hole TBa of the power supply side terminal fitting TB of the second power supply side wire WB2 to assemble the power supply side terminal fitting TB to the second power supply side electrical connection structure 70B. In the electrical connection box 1, the internal threaded parts 73 are screwed into the external threaded parts of the external threaded parts 71, respectively, to fasten and fix the power supply side terminal fittings TB of the first power supply side wire WB1, the second electrical connection parts 62 of the two first internal conductive parts 60A, and the first power supply connection part 22A of the circuit protection member 21 together, and to fasten and fix the power supply side terminal fittings TB of the second power supply side wire WB2, the second electrical connection part 62 of the second internal conductive part 60B, and the second power supply connection part 22B of the circuit protection member 21 together. In the electrical connection box 1, the two power supply side terminal fittings TB and the circuit protection member 20 are assembled to the block 30 via the first power supply side electrical connection structure 70A and the second power supply side electrical connection structure 70B.

[0125] An opening 43a of each of the first sub-barrel portion 43A and the second sub-barrel portion 43B, together with two power supply side terminal accessories TB, the second electrical connection portions 62 of each of the two first internal conductive components 60A and the second internal conductive components 60B, the first power supply connection portion 22A and the second power supply connection portion 22B of the circuit protection component 21, the first power supply side electrical connection structure 70A and the second power supply side electrical connection structure 70B, are covered by the first cover component 51 and housed in the first cover component 51.

[0126] The second cover member 52 includes a first sealing portion 53A and a second sealing portion 53B as the sealing portion 53. The first sealing portion 53A seals the other opening 43b of the first sub-tube portion 43A so as not to be exposed to the outside of the frame 40, and the second sealing portion 53B seals the other opening 43b of the second sub-tube portion 43B so as not to be exposed to the outside of the frame 40. Figure 1 , Figure 3 , Figure 6 and Fig.13). The first closing portion 53A and the second closing portion 53B may be a single plate-shaped wall portion that closes the other opening 43b together with the first cutout 44A and the second cutout 44B from the outside of the frame 40, or may be composed of a plurality of wall portions that surround and cover the other opening 43b together with the first cutout 44A and the second cutout 44B from the outside of the frame 40. Here, the first split cover 52A is assembled to the periphery of the other opening 41b of the barrel 41 provided with the first sub-barrel portion 43A and the second sub-barrel portion 43B. Therefore, the first closing portion 53A and the second closing portion 53B are provided on the first split cover 52A.

[0127] As described above, the circuit protection component 20 of the present embodiment can be installed with the additional circuit protection component 29 afterwards, so when the additional external load L2 to be added is added, the additional circuit protection component 29 can be interposed between the additional external load L2 and the external power supply B. Therefore, the circuit protection component 20 can cope with the addition of the additional external load L2, and can cut off the overcurrent between the additional additional external load L2 and the external power supply B by the additional circuit protection component 29. In addition, the electrical junction box 1 of the present embodiment is provided with the circuit protection component 20 corresponding to the addition of the external load (the additional external load L2), and the effect of the circuit protection component 20 can be obtained in the same manner.

[0128] Furthermore, the electrical connection box 1 of the present embodiment arranges the circuit protection component 20 outside the barrel of the barrel 41 and outside the frame 40, so that the power supply side wire WB (the first power supply side wire WB1, the second power supply side wire WB2), the first load side wire WL1, and the second load side wire WL2 connected to the circuit protection component 20 can be suppressed from overloading the periphery in the box. In particular, in the electrical connection box 1, the larger the wire diameter, the more difficult it is for the power supply side wire WB (the first power supply side wire WB1, the second power supply side wire WB2), the first load side wire WL1, and the second load side wire WL2 to bend, so that the power supply side wire WB and the like can be suppressed from overloading the periphery in the box. For example, in the electrical connection box 1, by suppressing the overload of the power supply side wire WB and the like on the second cover member 52 in the box, the deformation of the second cover member 52 can be suppressed. In addition, by laying the power supply side wire WB and the like, which are difficult to bend, outside the frame 40, the electrical connection box 1 can improve the accommodation of other wires in the barrel of the barrel 41. Furthermore, since the electric connection box 1 lays the power-side electric wires WB and the like outside the frame 40 , heat generated by the power-side electric wires WB and the like does not accumulate in the box, and thus a temperature rise in the box can be suppressed.

Claims

1. A circuit protection component, characterized in that: have: A conductive circuit protection member, the circuit protection member is a member between a power supply side wire electrically connected to an external power supply and a first load side wire electrically connected to an external load, and is a member for cutting off an overcurrent between the external power supply and the external load, wherein when an additional external load is added, the circuit protection member is capable of electrically connecting a first terminal portion of the additional circuit protection member to the external power supply, and the additional circuit protection member is used to cut off an overcurrent between the external power supply and the additional external load; as well as an additional load-side electrical connection structure, which, when the additional external load is added, can electrically connect a second load-side electric wire electrically connected to the additional external load to a second terminal portion of the additional circuit protection component; The circuit protection component comprises: a power connection part, the power connection part being electrically connected to the power supply side wire; a load connection part, the load connection part being electrically connected to the first load side wire; a fusible part, the fusible part being interposed between the power connection part and the load connection part; an additional electrical connection part, the additional electrical connection part being physically and electrically connected to the first terminal part; and a connecting part, the connecting part connecting the additional electrical connection part to the power connection part. The circuit protection component is provided with at least one combination of the additional electrical connection portion and the additional load-side electrical connection structure.

2. The circuit protection component according to claim 1, characterized in that: The circuit protection component has an additional power supply side electrical connection structure, and when the additional external load is added, the additional power supply side electrical connection structure can electrically connect the first terminal portion of the additional circuit protection component with the additional electrical connection portion of the circuit protection member. The additional power supply side electrical connection structure is a connection structure that physically connects the first terminal portion of the additional circuit protection component and the additional electrical connection portion of the circuit protection member. The additional load-side electrical connection structure is a connection structure that physically connects the load-side terminal fitting at the end of the second load-side electric wire to the second terminal portion of the additional circuit protection component.

3. The circuit protection component according to claim 1, characterized in that: The circuit protection component has an additional power supply side electrical connection structure, and when the additional external load is added, the additional power supply side electrical connection structure can electrically connect the first terminal portion of the additional circuit protection component with the additional electrical connection portion of the circuit protection member. The additional power supply side electrical connection structure is a common fastening and fixing structure in which the first terminal portion and the additional electrical connection portion are screwed and fixed. The additional load-side electrical connection structure is a common fastening and fixing structure in which a load-side terminal fitting at the end of the second load-side electric wire is screwed and fixed to the second terminal portion of the additional circuit protection component.

4. An electrical connection box, characterized in that: have: Electronic components; an internal conductive component, the internal conductive component electrically connecting the electronic component to an external power source; A frame, wherein the frame has a cylindrical portion, the cylindrical portion is composed of a cylindrical wall with an opening at least at one end, and the electronic component and the internal conductive component are accommodated and held in the cylinder of the cylindrical portion; a cover member, the cover member closing the opening of the cylinder; as well as a circuit protection component, the circuit protection component cuts off the overcurrent between the external power supply and the external load, The internal conductive component comprises: a first electrical connection portion, which is physically and electrically connected to the electronic component in the barrel of the barrel portion; and a second electrical connection portion, The circuit protection component comprises: a conductive circuit protection member, the circuit protection member being a member for cutting off an overcurrent between the external power supply and the external load between a power supply-side electric wire electrically connected to the external power supply and a first load-side electric wire electrically connected to the external load, the circuit protection member being capable of electrically connecting a first terminal portion of an additional circuit protection member to the external power supply, the additional circuit protection member being used to cut off an overcurrent between the external power supply and an additional external load to be added; as well as an additional load-side electrical connection structure, the additional load-side electrical connection structure electrically connecting a second load-side electric wire electrically connected to the additional external load to a second terminal portion of the additional circuit protection component, The circuit protection component comprises: a power connection portion, which is electrically connected to the power supply side wire and physically and electrically connected to the second electrical connection portion of the internal conductive component; a load connection portion, which is electrically connected to the first load side wire; a fusible portion, which is interposed between the power connection portion and the load connection portion; an additional electrical connection portion, which is physically and electrically connected to the first terminal portion; and a connecting portion, which connects the additional electrical connection portion to the power connection portion. The electrical connection box is provided with at least one combination of the additional electrical connection portion and the additional load-side electrical connection structure.

5. The electrical connection box according to claim 4, characterized in that: The circuit protection component is arranged outside the frame outside the cylinder of the cylinder portion.

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