Power supply system

Abstract

To provide a power supply system which can be downsized but is flexibly applicable to any vehicle specification.SOLUTION: A power supply system 1 includes, as a relay unit 3, a relay unit selected from either a first relay unit 3A having an electronic component 50 or a second relay unit 3B having no electronic component 50. The power supply system includes, as an electric connection box 2, a shared electric connection box 13 having a mounting part 14 on which both the first and second relay units 3A and 3B can be mounted, and a bus bar equipped with an input terminal 20 disposed on the mounting part 14. The first relay unit 3A includes a first housing 30A including a first cavity 31A and a holding part 32A holding an external terminal 40A, and the electronic component 50 that is mounted in the first cavity 31A. The second relay unit 3B includes a second cavity 31B, and a connector 60 that accommodates the external terminal 40 and is fitted to the second cavity 31B.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a power supply system for supplying power from an external power source to an electrical connection box via a relay unit.

Background Art

[0002] Conventionally, an electrical connection box (e.g., a relay box) mounted on a vehicle distributes the power supplied from an external power source to the bus bar to various external electrical loads via electronic components such as relays, fuses, and fusible links (see, for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, an electrical connection box for a vehicle is designed to have not only an essential bus bar that is common regardless of the vehicle specifications but also a spare bus bar that is selectively used for each vehicle specification so that a common electrical connection box can be mounted on a plurality of types of vehicles with different specifications. Although such an electrical connection box has advantages in terms of versatility, in practice, fixing (e.g., fastening with nuts) terminals provided on wires connected to an external power source to stud bolts provided on the spare bus bar is a cumbersome operation, and it is also necessary to secure space for that operation in the electrical connection box in advance. Therefore, it is considered to have disadvantages in terms of miniaturization of the electrical connection box and reduction of manufacturing costs.

[0005] One object of the present invention is to provide a power supply system that can flexibly respond to vehicle specifications while enabling miniaturization of the power supply system and the like.

Means for Solving the Problems

[0006] To achieve the aforementioned objectives, the power supply system according to the present invention is characterized by the following:

[0007] A power supply system for supplying power from an external power source to an electrical junction box via a relay unit, As the aforementioned relay unit, The system comprises a first relay unit having electronic components for power supply control, and a second relay unit having electronic components, selected from the above. As the aforementioned electrical connection box, The shared electrical connection box includes a mounting section on which both the first relay unit and the second relay unit can be mounted, and a busbar having an input terminal located on the mounting section. The first relay unit is, A first housing having a first cavity in which the input terminal is exposed when mounted on the mounting portion, and a holding portion that holds an external terminal attached to a wire connected to the external power supply so as to be exposed in the first cavity, The electronic component is mounted in the first cavity and connects the input terminal and the external terminal, The second relay unit is, A second housing having a second cavity in which the input terminal is exposed when mounted on the aforementioned mounting portion, The connector includes the external terminals, which are housed in the second cavity and fitted into it to connect the input terminal and the external terminals, When the aforementioned electronic component is used, the first relay unit is mounted on the mounting portion. If the aforementioned electronic component is not used, the second relay unit is mounted on the mounting portion. It is a power supply system. [Effects of the Invention]

[0008] According to the power supply system of the present invention, when power is to be supplied to the electrical junction box from an external power source as needed, a relay unit (first relay unit or second relay unit) is attached to the mounting part of the electrical junction box (shared electrical junction box). This electrically connects the external terminals of the relay unit to the input terminals of the busbar. Since power can be supplied to the electrical junction box from an external power source simply by attaching the relay unit to the mounting part, the fastening work and the space required for fastening work described above are unnecessary. Furthermore, since a first relay unit having electronic components for power supply control (e.g., a fusible link) and a second relay unit without such electronic components can be arbitrarily selected, the system can flexibly adapt to the specifications of the vehicle. Therefore, the power supply system with this configuration can be miniaturized while flexibly adapting to the specifications of the vehicle.

[0009] The present invention has been briefly described above. Further details of the present invention will be clarified by referring to the accompanying drawings and reading through the embodiments for carrying out the invention described below. [Brief explanation of the drawing]

[0010] [Figure 1] Figure 1 is a perspective view showing an electrical junction box and a relay unit in a power supply system according to an embodiment of the present invention. [Figure 2] Figure 2 is a perspective view showing a fuse block having a mounting portion and a first relay unit mounted on the mounting portion. [Figure 3] Figure 3 is a front view showing the first relay unit shown in Figure 2, with the fusible link not yet installed. [Figure 4] Figure 4 is a perspective view showing the state in which the first relay unit is attached to the mounting portion of the fuse block. [Figure 5] Figure 5 is a cross-sectional view of AA in Figure 4. [Figure 6] Figure 6 is a cross-sectional view of BB in Figure 5. [Figure 7]FIG. 7 is a perspective view showing a state in which the second relay unit is attached to the attachment portion of the fuse block. [Figure 8] FIG. 8 is a cross-sectional view taken along the line C-C of FIG. 7.

Mode for Carrying Out the Invention

[0011] <Embodiment> Hereinafter, with reference to the drawings, the power supply system 1 according to the embodiment of the present invention shown in FIG. 1 will be described. The power supply system 1 is a system for supplying power from an external power source (not shown) to the electrical connection box 2 via the relay unit 3. The electrical connection box 2 is typically a relay box mounted on a vehicle. The electrical connection box 2 transmits the power supplied from an external power source (not shown) from a bus bar (not shown) provided inside the electrical connection box 2 to electronic components (not shown) such as relays, fuses, and fusible links, and also functions to distribute the power to various external electrical components (not shown).

[0012] Hereinafter, for convenience of explanation, as shown in FIGS. 1 to 8, “front”, “rear”, “left”, “right”, “up” and “down” are defined. The “front-rear direction”, “left-right direction” and “up-down direction” are orthogonal to each other. Note that these directions are defined for convenience of explanation and do not necessarily correspond to the front-rear direction, left-right direction and up-down direction of the vehicle when the electrical connection box 2 is mounted on the vehicle.

[0013] In the power supply system 1, depending on the specifications of the vehicle on which the electrical connection box 2 is mounted, it is selected whether or not to attach the relay unit 3 to the electrical connection box 2. If the vehicle specification does not require the relay unit 3, the relay unit 3 is not attached to the electrical connection box 2. When the relay unit 3 is attached to the electrical connection box 2, depending on the vehicle specifications and the like, one selected from the first relay unit 3A (see FIGS. 2 to 6) and the second relay unit 3B (see FIGS. 7 and 8) as the relay unit 3 is attached to the electrical connection box 2.

[0014] Hereinafter, first, the electrical connection box 2 will be described. As shown in FIG. 1, the housing of the electrical connection box 2 includes a substantially rectangular cylindrical frame 11 extending in the vertical direction, a substantially rectangular flat upper cover 12a covering the upper end opening of the frame 11, and a lower cover 12b covering the lower end opening of the frame 11. Each component constituting the housing of the electrical connection box 2 is a resin molded body.

[0015] Inside the frame 11, a substantially rectangular flat fuse block 13 shown in FIG. 2 is accommodated (see FIG. 1). The fuse block 13 is a resin molded body. The fuse block 13 is provided with a plurality of cavities R for accommodating a plurality of electronic components (not shown) such as relays, fuses, and fusible links so as to be arranged in the front, rear, left, and right directions. At the rear end portion of the right end face of the fuse block 13, a mounting portion 14 to which the relay unit 3 can be mounted is integrally provided. When the relay unit 3 is used, the relay unit 3 will be mounted on the mounting portion 14 (see FIGS. 4 and 7).

[0016] As shown in FIG. 2, the mounting portion 14 includes a bottom wall 15 protruding to the right from the fuse block 13 and extending in the front-rear direction, a pair of front and rear side walls 16 extending upward from both front and rear end edges of the bottom wall 15 and arranged to face each other in the front-rear direction, and a left side wall 17 extending upward from the left end edge of the bottom wall 15 and connected to the left end edges of the pair of front and rear side walls 16. The mounting portion 14 has a hollow portion defined by the bottom wall 15, the pair of front and rear side walls 16, and the left side wall 17 and opening upward and to the right. When the relay unit 3 is mounted on the mounting portion 14, a part of the relay unit 3 (more specifically, a part of the first housing 30A or the second housing 30B described later) is accommodated in the hollow portion of the mounting portion 14 (see FIGS. 4 and 7).

[0017] On the left end portion of the upper surface of the bottom wall 15, a guide groove 18 recessed downward and extending in the front-rear direction is provided (see FIGS. 2 and 5). When the relay unit 3 is mounted on the mounting portion 14, a guide rib 34 (see FIGS. 3 and 5) of the relay unit 3 is accommodated in the guide groove 18.

[0018] A terminal housing chamber 19 is formed adjacent to the right side of the guide groove 18 in the bottom wall 15, penetrating the bottom wall 15 vertically (see Figure 5). A metal input terminal 20 is housed in the terminal housing chamber 19, inserted from below upward (see Figure 5). The input terminal 20 extends vertically and in the front-to-back direction and has a flat, tab-like shape that is long in the vertical direction (see Figure 2). The input terminal 20 housed in the terminal housing chamber 19 is held in a predetermined position within the terminal housing chamber 19 by engaging with a lance 21 (see Figure 5) provided on the inner wall of the terminal housing chamber 19. The upper portion of the input terminal 20 held in the terminal housing chamber 19 protrudes upward from the bottom wall 15 and is exposed in the hollow part of the mounting portion 14 (see Figures 2 and 5). The lower end of the input terminal 20 held in the terminal housing chamber 19 is connected to a metal busbar (not shown) built into the fuse block 13.

[0019] An engaging portion 22 is provided in the bottom wall 15 adjacent to the right side of the terminal housing chamber 19. Specifically, the engaging portion 22 is a cantilevered elastic piece that extends upward and is elastically deformable in the left-right direction, forming part of the right side surface of the bottom wall 15, and has a locking hole that engages with a locking projection 38 (see Figures 3 and 5), which will be described later and belongs to the relay unit 3.

[0020] A pair of downwardly recessed guide grooves 23 are formed at the upper edges of the front and rear side walls 16 (see Figures 2 and 6). When the relay unit 3 is attached to the mounting section 14, the pair of front and rear guide grooves 23 accommodate the front and rear guide ribs 33 of the relay unit 3 (see Figures 2 to 4 and 6), which will be described later.

[0021] Next, the configuration of the first relay unit 3A will be described. The first relay unit 3A is selected as the relay unit 3 when supplying power from an external power source (not shown) to the busbar built into the fuse block 13 and connected to the input terminal 20 via a fusible link 50 (see Figures 2 and 5, etc.), and is mounted on the mounting section 14.

[0022] As shown in Figures 2 to 6, the first relay unit 3A has a first housing 30A. The first housing 30A is a resin molded body and integrally includes a first cavity 31A and a retaining portion 32A located below the first cavity 31A. The first cavity 31A has a roughly rectangular box shape that opens upward, and the fusible link 50 is housed in the hollow portion of the first cavity 31A from above (see Figure 5, etc.).

[0023] A pair of front and rear guide ribs 33 are provided at the upper ends of the front and rear side walls of the first cavity 31A, projecting outward in the front-rear direction (see Figures 2 to 4 and 6). A guide rib 34 is formed at the left end of the bottom wall of the first cavity 31A, projecting downward and extending in the front-rear direction (see Figures 3 and 5). A through hole 35 is formed in the left region of the bottom wall of the first cavity 31A, which penetrates vertically and through which the upper portion of the input terminal 20 provided on the mounting portion 14 is inserted (see Figure 5).

[0024] The retaining portion 32A has a substantially rectangular cylindrical shape that extends downward from the right-side region of the bottom wall of the first cavity 31A and opens downward. The main body 41 of the external terminal 40, to which the end portion of an electric wire 43 connected to an external power supply (not shown) is inserted from below and housed in the hollow portion of the retaining portion 32A (see Figure 5, etc.). The external terminal 40 has a main body 41 that extends vertically to which the end portion of the electric wire 43 is connected, and a tab portion 42 that protrudes upward from the upper end of the main body portion 41. The tab portion 42 has a flat plate shape that extends vertically and in the front-rear direction and is long in the vertical direction. A through hole 36 that penetrates vertically is formed in the partition wall that vertically separates the retaining portion 32A and the first cavity 31A (= the right-side region of the bottom wall of the first cavity 31A) through which the tab portion 42 is inserted (see Figure 5). The main body portion 41 of the external terminal 40, housed in the hollow portion of the holding portion 32A, is held in a predetermined position within the holding portion 32A by engaging with a lance 37 (see Figure 5) provided on the inner wall of the holding portion 32A. The tab portion 42 of the external terminal 40 held in the holding portion 32A protrudes upward from the through hole 36 and is exposed in the hollow portion of the first cavity 31A (see Figure 5). The electric wire 43 connected to the external terminal 40 held in the holding portion 32A extends downward from the lower end of the main body portion 41 toward the outside of the holding portion 32A.

[0025] On the left side wall of the holding portion 32A, a locking projection 38 is formed that protrudes to the left, corresponding to the engaging portion 22 of the mounting portion 14 (see Figure 2) (see Figures 3 and 5). On the right side wall of the holding portion 32A, a wire holding portion 39 is provided. In this example, the wire 43 extending downward from the external terminal 40 held by the holding portion 32A toward the outside of the holding portion 32A is first folded back to the right in a U-shape and extends upward to be held by the wire holding portion 39, and then folded back to the right in a U-shape and extends downward (see Figures 2 to 4).

[0026] The fusible link 50 has a housing that is roughly rectangular in shape and can be housed in the hollow part of the first cavity 31A. Inside the fusible link 50 is a melting section (not shown) that melts when a current exceeding a predetermined rated current flows through it. On the lower surface of the fusible link 50, an input terminal housing chamber 51 and an external terminal housing chamber 52 are provided, corresponding to the tab portions 42 of the input terminal 20 and the external terminal 40 (see Figure 5).

[0027] When mounting the first relay unit 3A described above to the mounting section 14, first, with the external terminal 40 to which the electric wire 43 is connected held by the retaining section 32A and the fusible link 50 not housed in the first cavity 31A, the first cavity 31A is mounted to the mounting section 14 from above (see Figures 1 and 2). Specifically, the left portion of the first cavity 31A is housed in the hollow portion of the mounting section 14, the retaining section 32A extends downward from a position to the right of the right side of the bottom wall 15 of the mounting section 14, the upper portion of the input terminal 20 provided in the mounting section 14 is inserted through the through hole 35, the guide rib 34 is housed in the guide groove 18, and the front and rear pair of guide ribs 33 are housed in the front and rear pair of guide grooves 23 (see Figures 2 and 4).

[0028] When the first cavity 31A is mounted on the mounting portion 14, as shown in Figure 5, the engagement between the locking projection 38 and the locking hole of the engagement portion 22 prevents the first cavity 31A (first housing 30A) from separating upward from the mounting portion 14. The upper portion of the input terminal 20 and the tab portion 42 of the external terminal 40 are exposed in the hollow portion of the first cavity 31A. In this way, when the first cavity 31A is mounted on the mounting portion 14, the guide rib 34 is housed in the guide groove 18, and the front and rear pair of guide ribs 33 are housed in the front and rear pair of guide grooves 23, thereby aligning the first cavity 31A so that the upper portion of the input terminal 20 is inserted through the through hole 35 and exposed in the hollow portion of the first cavity 31A. This makes it easier to mount the first cavity 31A on the mounting portion 14.

[0029] Next, the fusible link 50 is housed in the first cavity 31A. Specifically, the fusible link 50 is mounted in the hollow part of the first cavity 31A from above, such that the input terminal 20 and tab portion 42 exposed in the hollow part of the first cavity 31A are inserted into the input terminal housing chamber 51 and the external terminal housing chamber 52, respectively (see Figure 5). With the fusible link 50 mounted in the first cavity 31A, the input terminal 20 and the external terminal 40 (tab portion 42) are electrically connected via the fuse portion. With this, the mounting of the first relay unit 3A to the mounting portion 14 is completed. With the first relay unit 3A mounted, power can be supplied from an external power source (not shown) to the busbar built into the fuse block 13 and connected to the input terminal 20 via the fusible link 50.

[0030] Next, the configuration of the second relay unit 3B will be described with reference to Figures 7 and 8. The second relay unit 3B is selected as the relay unit 3 and mounted on the mounting section 14 when supplying power from an external power source (not shown) to the busbar built into the fuse block 13 and connected to the input terminal 20, without going through electronic components such as the fusible link 50. In the second relay unit 3B shown in Figures 7 and 8, parts that are the same as or equivalent to parts of the first relay unit 3A shown in Figures 1 to 6 are denoted by the same reference numerals as those assigned to parts of the first relay unit 3A.

[0031] As shown in Figures 7 and 8, the second relay unit 3B has a second housing 30B in place of the first housing 30A. The second housing 30B is a resin molded body and integrally includes a second cavity 31B and an extension 32B located below the second cavity 31B. The second cavity 31B has a roughly rectangular box shape that opens upward and is roughly the same shape as the first cavity 31A. In the hollow part of the second cavity 31B, a housing 61 of a connector 60, which houses an external terminal (not shown) to which the terminal portion of an electric wire 43 connected to an external power supply is fitted from above, instead of a fusible link 50. The extension 32B is a plate-shaped portion that extends downward from the right side region of the bottom wall of the second cavity 31B and does not have the function of holding the external terminal like the holding portion 32A of the first relay unit 3A.

[0032] The housing 61 of the connector 60 is a resin molded body and has a roughly rectangular cylindrical shape that extends vertically and can be fitted into the hollow part of the second cavity 31B (see Figure 8). An insertion hole 62 is formed at the lower end of the housing 61 for inserting the upper part of the input terminal 20 provided on the mounting part 14, and the upper end of the housing 61 is open. The external terminal 40B (dashed line omitted in Figure 8) connected to the electric wire 43 is inserted into the hollow part of the housing 61 through the opening at the upper end of the housing 61 and housed there. The external terminal 40B housed in the housing 61 is held in a predetermined position within the housing 61 by engaging with a lance 63 (see Figure 8) provided on the inner wall of the housing 61. The external terminal 40B housed in the housing 61 is a female terminal with a structure that allows electrical connection to the upper part (tab-shaped male terminal) of the input terminal 20. A locking piece 64 is provided on the right side wall of the housing 61, which can engage with a locking projection 31a provided on the inner wall of the second cavity 31B (see Figures 7 and 8).

[0033] When mounting the second relay unit 3B to the mounting section 14, first, with the connector 60 not housed in the second cavity 31B, the second cavity 31B is mounted to the mounting section 14 from above (see Figures 7 and 8). Specifically, the left portion of the second cavity 31B is housed in the hollow portion of the mounting section 14, the extension portion 32B extends downward from a position to the right of the right side of the bottom wall 15 of the mounting section 14, the upper portion of the input terminal 20 provided on the mounting section 14 is inserted through the through hole 35, the guide rib 34 is housed in the guide groove 18, and the front and rear pair of guide ribs 33 are housed in the front and rear pair of guide grooves 23 (see Figures 7 and 8).

[0034] When the second cavity 31B is mounted on the mounting portion 14, as shown in Figure 8, the engagement between the locking projection 38 and the locking hole of the engagement portion 22 prevents the second cavity 31B (second housing 30B) from separating upward from the mounting portion 14. The upper part of the input terminal 20 is exposed in the hollow portion of the second cavity 31B. In this way, when the second cavity 31B is mounted on the mounting portion 14, the guide rib 34 is housed in the guide groove 18, and the front and rear pair of guide ribs 33 are housed in the front and rear pair of guide grooves 23, thereby aligning the second cavity 31B so that the upper part of the input terminal 20 is inserted through the through hole 35 and exposed in the hollow portion of the second cavity 31B. This makes it easier to mount the second cavity 31B on the mounting portion 14.

[0035] Next, the housing 61 of the connector 60, which houses the external terminal 40B to which the electric wire 43 is connected, is fitted into the second cavity 31B. Specifically, the housing 61 housing the external terminal 40B is fitted into the hollow part of the second cavity 31B from above, so that the input terminal 20, which is exposed in the hollow part of the second cavity 31B, is inserted into the insertion hole 62 of the housing 61 (see Figure 8). With the housing 61 housing the external terminal 40B mounted in the second cavity 31B, the input terminal 20 and the external terminal 40B are electrically directly connected. Furthermore, the engagement of the locking projection 31a and the locking piece 64 prevents the housing 61 (connector 60) from separating upward from the second cavity 31B (see Figure 8). With the above steps, the mounting of the second relay unit 3B to the mounting section 14 is completed. With the second relay unit 3B installed, power can be supplied from an external power source (not shown) to the busbar, which is built into the fuse block 13 and connected to the input terminal 20, without going through electronic components such as the fusible link 50.

[0036] As explained above, when the relay unit 3 is installed in the electrical connection box 2, the first relay unit 3A is selected when power is supplied from an external power source to the busbar built into the fuse block 13 via the fusible link 50, depending on the vehicle specifications, etc., and the second relay unit 3B is selected when power is supplied from an external power source to the busbar built into the fuse block 13 without going through electronic components such as the fusible link 50.

[0037] <Effects and Actions> As described above, according to the power supply system 1 of this embodiment, when power is to be supplied to the electrical junction box 2 from an external power source as needed, the relay unit 3 (first relay unit 3A or second relay unit 3B) is attached to the mounting section 14 of the electrical junction box 2 (fuse block 13). This electrically connects the external terminals 40A and 40B of the relay unit 3 to the input terminal 20 of the busbar. Since power can be supplied to the electrical junction box 2 from an external power source simply by attaching the relay unit 3 to the mounting section 14, the work of fastening stud bolts and nuts and the space required for fastening work are eliminated. Furthermore, since the first relay unit 3A, which has an electronic component (fusible link 50) for power supply control, and the second relay unit 3B, which does not have such an electronic component, can be arbitrarily selected, the system can flexibly adapt to the specifications of the vehicle. Therefore, the power supply system 1 can be miniaturized while flexibly adapting to the specifications of the vehicle.

[0038] Furthermore, the guide ribs 33, 34 of the first housing 30A and the guide ribs 33, 34 of the second housing 30B make it easier to attach the relay unit 3 to the mounting portion 14 of the fuse block 13.

[0039] <Other forms> It should be noted that the present invention is not limited to the embodiments described above, and various modifications can be adopted within the scope of the present invention. For example, the present invention is not limited to the embodiments described above, and can be modified, improved, etc. as appropriate. Furthermore, the material, shape, dimensions, number, placement, etc. of each component in the embodiments described above are arbitrary and not limited as long as they can achieve the present invention.

[0040] Herein, the features of the embodiments of the power supply system 1 according to the present invention described above are briefly summarized and listed below in [1] and [2].

[0041] [1] A power supply system (1) for supplying power from an external power source to an electrical junction box (2) via a relay unit (3), As the relay unit (3), The system comprises one of the following: a first relay unit (3A) having an electronic component (50) for power supply control, and a second relay unit (3B) having the electronic component (50). As the aforementioned electrical junction box (2), The shared electrical connection box (13) includes a mounting section (14) on which both the first relay unit (3A) and the second relay unit (3B) can be mounted, and a busbar having an input terminal (20) located on the mounting section (14). The first relay unit (3A) is, A first housing (30A) having a first cavity (31A) in which the input terminal (20) is exposed when mounted on the mounting portion (14), and a holding portion (32A) that holds an external terminal (40A) attached to a wire (43) connected to the external power supply so as to be exposed in the first cavity (31A), The device has an electronic component (50) that is mounted in the first cavity (31A) and connects the input terminal (20) and the external terminal (40A), The second relay unit (3B) is, A second housing (30B) having a second cavity (31B) in which the input terminal (20) is exposed when mounted on the mounting portion (14), The device includes a connector (60) that houses the external terminal (40B) and is fitted into the second cavity (31B) to connect the input terminal (20) and the external terminal (40B), When the aforementioned electronic component (50) is used, the first relay unit (3A) is mounted on the mounting portion (14). If the aforementioned electronic component (50) is not used, the second relay unit (3B) is mounted on the mounting portion (14). Power supply system (1).

[0042] According to the power supply system with the configuration described in [1] above, when power is to be supplied to the electrical junction box from an external power source as needed, a relay unit (first relay unit or second relay unit) is attached to the mounting part of the electrical junction box (shared electrical junction box). This electrically connects the external terminals of the relay unit to the input terminals of the busbar. Since power can be supplied to the electrical junction box from an external power source simply by attaching the relay unit to the mounting part, the fastening work and the space required for fastening work described above are not necessary. Furthermore, since a first relay unit having electronic components for power supply control (e.g., a fusible link) and a second relay unit without such electronic components can be arbitrarily selected, the system can flexibly adapt to the specifications of the vehicle. Therefore, the power supply system with this configuration can be miniaturized while flexibly adapting to the specifications of the vehicle.

[0043] [2] In the power supply system (1) described in [1] above, The first housing (30A) is, The mounting portion (14) has first guide ribs (33, 34) that align the first cavity (31A) so that the input terminal (20) is exposed to the first cavity (31A) when mounted, The second housing (30B) is, The mounting portion (14) has a second guide rib (33, 34) that aligns the second cavity (31B) so that the input terminal (20) is exposed to the second cavity (31B) when it is mounted on the mounting portion (14). Power supply system (1).

[0044] According to the power supply system with the configuration described in [2] above, the first guide rib of the first housing and the second guide rib of the second housing make it easier to attach the relay unit (i.e., the first relay unit or the second relay unit) to the mounting part of the electrical junction box (i.e., the shared electrical junction box). [Explanation of symbols]

[0045] 1. Power supply system 2. Electrical junction box 3. Relay Unit 3A 1st Relay Unit 3B Second relay unit 13. Fuse block (shared electrical junction box) 14 Mounting part 20 input terminals 30A First Housing 30B Second Housing 31A First Cavity 31B Second Cavity 32A Holding part 33 Guide ribs (first guide rib, second guide rib) 34 Guide ribs (first guide rib, second guide rib) 40A external terminal 40B External terminal 43 Electric wire 50 Fusible links (electronic components) 60 connectors

Claims

1. A power supply system for supplying power from an external power source to an electrical junction box via a relay unit, As the aforementioned relay unit, The system comprises a first relay unit having electronic components for power supply control, and a second relay unit having electronic components, selected from the above. As the aforementioned electrical connection box, The shared electrical connection box includes a mounting section on which both the first relay unit and the second relay unit can be mounted, and a busbar having an input terminal located on the mounting section. The first relay unit is, A first housing having a first cavity in which the input terminal is exposed when mounted on the mounting portion, and a holding portion that holds an external terminal attached to a wire connected to the external power supply so as to be exposed in the first cavity, The electronic component is mounted in the first cavity and connects the input terminal and the external terminal, The second relay unit is, A second housing having a second cavity in which the input terminal is exposed when mounted on the aforementioned mounting portion, The device includes a connector that houses the external terminal and is fitted into the second cavity to connect the input terminal and the external terminal, When the aforementioned electronic component is used, the first relay unit is mounted on the mounting portion. If the aforementioned electronic component is not used, the second relay unit is mounted on the mounting portion. Power supply system.

2. In the power supply system according to claim 1, The first housing is, The mounting portion has a first guide rib that aligns the first cavity so that the input terminal is exposed to the first cavity when mounted, The preceding 2 housing is The mounting portion has a second guide rib that aligns the second cavity so that the input terminal is exposed to the second cavity when mounted. Power supply system.

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