Power distribution box, automotive wiring structure

Abstract

To provide a power supply distribution box which can facilitate an interruption work of a high-voltage circuit before an operation such as a maintenance, and can improve a work efficiency.SOLUTION: A disconnection detection circuit 61 can disconnect a high-voltage circuit 65. A power supply distribution box 59 provides a disconnection part 67. The disconnection part 67 is arranged onto the disconnection detection circuit 61, and can disconnect the disconnection detection circuit 61. The disconnection part 67 is constructed by: a switching housing; and a rotor switch or the like that performs a switch operation of a conduction of both terminals arranged into an inner part of a switching housing. The switching housing is formed in a part of a housing constructing the power supply distribution box 59. By the operation of the rotor switch, the high-voltage circuit 65 can be disconnected by opening the disconnection detection circuit 61.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to so-called power distribution boxes such as relay boxes and fuse boxes used in automobiles.

Background Art

[0002] The batteries of electric vehicles such as BEVs and HEVs are connected to a power distribution box having a power distribution function such as a relay box or a fuse box, and a high-voltage circuit is connected to a motor or the like. In order to prevent accidents such as electric shock and fire during maintenance and repair of such vehicles, a service plug for cutting off the high-voltage circuit is arranged in the battery (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] FIG. 11 is a schematic diagram showing a wiring structure 100 in a conventional electric vehicle. In the wiring structure 100, for example, a battery 105 which is a high-voltage power source is connected to an inverter 103, a motor 101, etc. by a high-voltage circuit 115. Further, an ECU 107 for performing control and the like, a power distribution box 109 (relay box or fuse box), etc. are connected by a control circuit (not shown) or the like.

[0005] Furthermore, a wire break detection circuit 113 is routed in the wiring structure 100. The wire break detection circuit 113 detects wire breaks between each device, and when a wire break is detected, the high-voltage circuit 115 is shut off. Normally, the power distribution box 109 is located on a different circuit than the wire break detection circuit 113, but it may also be located on the wire break detection circuit 113. In this case, the wire break detection circuit 113 becomes a pass-through circuit in the power distribution box 109.

[0006] As mentioned above, a service plug 111 is located on the battery 105. The service plug 111 is a component for interrupting the high-voltage circuit 115, and by removing the service plug 111, the high-voltage circuit 115 and the disconnection detection circuit 113 are physically interrupted, making it possible to perform work.

[0007] On the other hand, the location of the battery 105 varies depending on the vehicle, for example, it may be located under the front seat, under the rear seat, or under the cargo area. Therefore, when performing maintenance or other work, it is necessary to check the location of the service plug 111 for each vehicle. In addition, it may be necessary to remove part of the interior to remove the service plug 111, and specialized tools may be required. Therefore, the work is inefficient, and a more efficient method is desired.

[0008] This invention has been made in view of the above problems, and aims to provide a power distribution box, etc., that can simplify the shutoff of high-voltage circuits before maintenance work and improve work efficiency. [Means for solving the problem]

[0009] To achieve the aforementioned objective, the first invention is a power distribution box for an automobile having a wire break detection circuit capable of interrupting a voltage circuit, wherein the power distribution box has a break section arranged in the wire break detection circuit, the break section comprises a switch housing and a rotary switch that performs an operation to open and close the conductivity between terminals arranged inside the switch housing, and the power distribution box is characterized in that the high-voltage circuit can be interrupted by opening the wire break detection circuit by operating the rotary switch.

[0010] The inner surface of the switch housing has protrusions formed in opposing directions, the rotary switch has a main body and a conductive portion attached to the main body, and a circumferential groove is formed on the outer circumference of the main body in a predetermined range in the circumferential direction into which the protrusions can be fitted, and the main body may be rotated relative to the switch housing when the protrusions are fitted into the circumferential grooves.

[0011] In the first state, when the rotary switch is turned, the conductive portion allows electrical conductivity between the terminals, closing the disconnection detection circuit. In the second state, when the rotary switch is turned in the opposite direction, the conductive portion separates from the terminals, opening the disconnection detection circuit. The outer circumference of the main body has an axial groove that is continuous with the circumferential groove and substantially perpendicular to the circumferential groove. In the first state, the protrusion is located in a different location from the axial groove, and the main body is fixed to the switch housing. In the second state, the protrusion is located in the axial groove, and the main body can be removed from the switch housing.

[0012] A fixing mechanism for fixing the position of the protrusion in the first state may be formed in the circumferential groove.

[0013] The conductive portion is formed by bending a springy metal member and has a central fixing portion and terminal contact portions at both ends. A locking claw may be formed on the outer surface of the fixing portion, and the locking claw may be locked and fixed to a locking portion inside the main body.

[0014] According to the first invention, by arranging the disconnection section of the wire break detection circuit in the power distribution box, work can be performed in a substantially fixed location such as the engine compartment. Furthermore, since the disconnection section can be operated with a rotary switch, work is easy. Therefore, the work location is easy to determine, and the high-voltage circuit can be shut off with simple operation. In addition, since the disconnection section is located on the wire break detection circuit, the generation of arcs and the like is suppressed, making it safer compared to when it is located on the high-voltage circuit.

[0015] Furthermore, by providing a switch housing on the power distribution box and rotating the rotary switch along the protrusion, it is not necessary to form a special fixing structure for the power distribution box. Therefore, the rotary switch can be fixed with a simple structure.

[0016] Furthermore, if the rotary switch is fixed to the switch housing when the disconnection detection circuit is energized, and if the rotary switch can be removed when the disconnection detection circuit is disconnected, accidental operation when the circuit is disconnected can be suppressed.

[0017] Furthermore, by providing a fixing mechanism in the circumferential groove where the protrusions interlock, the position of the rotary switch can be fixed when the wire break detection circuit is in a conductive state.

[0018] Furthermore, since the conductive part is made of a springy metal component, reliable electrical connection can be ensured between the conductive part and the terminal. In addition, by fixing the conductive part to the main body with a locking mechanism, a rotary switch can be constructed with an extremely simple structure.

[0019] The second invention is an automotive wiring structure having a power distribution box according to the first invention, comprising a high-voltage circuit and a disconnection detection circuit for interrupting the high-voltage circuit during disconnection. The power distribution box has a terminal constituting a part of the disconnection detection circuit and a blocking portion capable of blocking the conduction state between the terminals. By operating the rotary switch to open the disconnection detection circuit, it is possible to interrupt the high-voltage circuit. This is an automotive wiring structure characterized by this.

[0020] According to the second invention, it is possible to easily interrupt the high-voltage circuit and perform operations such as maintenance without using a service plug.

Effects of the Invention

[0021] According to the present invention, it is possible to provide a power distribution box or the like that simplifies the operation of interrupting the high-voltage circuit before operations such as maintenance and improves work efficiency.

Brief Description of the Drawings

[0022] [Figure 1] A diagram showing the wiring structure 1. [Figure 2] (a) is a diagram showing the power distribution box 59, and (b) is a diagram showing the state where the rotary switch 3 is removed. [Figure 3] A plan view of the switch housing 5. [Figure 4] (a) is a cross-sectional view taken along the line C-C in FIG. 3, and (b) is a cross-sectional view taken along the line D-D in FIG. 3. [Figure 5] (a) is a perspective view of the rotary switch 3, and (b) is a cross-sectional view of the circumferential groove 13 of the rotary switch 3. [Figure 6] (a) is a cross-sectional view taken along the line A-A in FIG. 5(b), and (b) is a cross-sectional view taken along the line B-B in FIG. 5(b). [Figure 7] (a) and (b) are diagrams showing the method of inserting the rotary switch 3 into the switch housing 5. [Figure 8] A cross-sectional view in a direction perpendicular to FIG. 7(b). [Figure 9] This diagram shows the rotary switch 3 in a fixed position, with (a) and (b) being cross-sectional views perpendicular to each other. [Figure 10] (a) and (b) are diagrams showing the process by which the protrusion 23 is fixed to the circumferential groove 13 by the fixing mechanism 15. [Figure 11] A diagram showing a conventional wiring structure 100. [Modes for carrying out the invention]

[0023] Embodiments of the present invention will be described below with reference to the drawings. Figure 1 is a schematic diagram showing a power distribution structure 1 having a power distribution box 59 in an electric vehicle or the like. Note that various control circuits and devices are not shown in Figure 1.

[0024] In the wiring configuration 1, for example, the inverter 53 and motor 51 are connected to the battery 55 via a high-voltage circuit 65. In addition, as mentioned above, a wire break detection circuit 61 is provided separately from the high-voltage circuit 65, and the ECU 57 which performs various controls and the power distribution box 59 are connected to the inverter 53 and motor 51. The wire break detection circuit 61 is capable of shutting off the high-voltage circuit 65.

[0025] As mentioned above, the power distribution box 59 is, for example, a relay box or a fuse box, and is connected to each device via relays and fuses, and is usually connected to each device by a control circuit (not shown), etc. In other words, normally the power distribution box 59 is arranged differently from the wire break detection circuit 61, but in this embodiment, the power distribution box 59 is arranged on the wire break detection circuit 61.

[0026] The power distribution box 59 is provided with a circuit breaker 67. The circuit breaker 67 is located on the wire break detection circuit 61 and is capable of shutting off the wire break detection circuit 61. In other words, by shutting off the wire break detection circuit 61 with the circuit breaker 67, the high-voltage circuit 65 can be shut off. In this embodiment, the installation of a service plug on the battery 55 is not necessarily required. Therefore, the circuit for connecting the service plug to the high-voltage circuit and part of the wire break detection circuit within the battery 55 can be reduced, thereby reducing the amount of wire or busbar used.

[0027] Figure 2(a) is a plan view showing the power distribution box 59, and Figure 2(b) shows the box with the rotary switch 3 removed. Note that the internal structure of the power distribution box 59 (arrangement of each part, etc.) is not limited to the example shown. Also, the power distribution box 59 is usually covered by a cover (not shown).

[0028] As mentioned above, the power distribution box 59 is connected to the disconnection detection circuit 61, and a circuit breaker 67 is located on the disconnection detection circuit 61. The circuit breaker 67 consists of a switch housing 5 and a rotary switch 3, etc., which operates the opening and closing of the conductivity between terminals 25 located inside the switch housing 5. In other words, the circuit breaker 67 is capable of interrupting the conductivity between terminals 25. The switch housing 5 is formed as part of the housing that makes up the power distribution box 59. As will be described in detail later, the high-voltage circuit 65 can be interrupted by opening the disconnection detection circuit 61 by operating the rotary switch 3.

[0029] Figure 3 is a plan view of the switch housing 5, Figure 4(a) is a cross-sectional view along line CC of Figure 3, and Figure 4(b) is a cross-sectional view along line DD of Figure 3. On the inner surface near the top of the switch housing 5, protrusions 23 are formed in opposing directions. That is, as shown in Figure 4(a), the inner diameter is smaller in the area of ​​the protrusions 23 compared to other areas. Note that the shape of the protrusions 23 does not have to be a roughly rectangular shape as shown in Figure 4(b), but may be a circle or other polygon.

[0030] Furthermore, two opposing terminals 25 are positioned below the switch housing 5. These terminals 25 can be, for example, relay terminals from a relay box. The terminals 25 are located on the aforementioned wire break detection circuit 61. When the terminals 25 are electrically connected, the wire break detection circuit 61 becomes a closed circuit, and when the terminals 25 are not electrically connected, it becomes an open circuit. In other words, the terminals 25 constitute a part of the wire break detection circuit 61.

[0031] Next, the rotary switch 3, which is attached to the switch housing 5, will be described in detail. Figure 5(a) is a perspective view of the rotary switch 3. The rotary switch 3 consists of a main body 7 and conductive parts 17 attached to the main body 7. The main body 7 is made of a resin such as PBT, PP, PE, or PP+PPE.

[0032] A knob 9 is provided on the top surface of the main body 7. The knob 9 allows for easy rotation of the rotary switch 3. The knob 9 is not mandatory, and if necessary, the outer surface of the main body 7 may be made uneven or subjected to surface treatment such as textured processing to facilitate rotation. In addition, a sticker may be attached to the top surface of the main body 7 to indicate the status (rotation position), or embossing or laser printing may be applied.

[0033] A circumferential groove 13 is formed on the outer circumference of the main body 7, into which the protrusion 23 formed on the switch housing 5 described above can be fitted. The circumferential groove 13 is formed in a predetermined range in the circumferential direction near the upper part of the main body 7. In addition, an axial groove 11 is formed on the outer circumference of the main body 7, which is continuous with the circumferential groove 13 and substantially perpendicular to the circumferential groove 13. The axial groove 11 is provided such that its upper end is continuous with the circumferential groove 13 and its lower end reaches the lower end of the main body 7.

[0034] Figure 5(b) is a horizontal cross-sectional view of the circumferential groove 13 of the rotary switch 3. The axial grooves 11 are formed in pairs at positions opposite to each other. The circumferential grooves 13 are formed from each axial groove 11 in a predetermined range in the same direction of rotation. The outer diameter of the axial grooves 11 and circumferential grooves 13 is smaller than that of the parts other than the grooves.

[0035] The tips of each circumferential groove 13 are formed to face each other in a direction substantially perpendicular to the opposing direction of the axial groove 11. As will be described in detail later, when the protrusion 23 formed on the switch housing 5 is fitted into the circumferential groove 13, the main body 7 can be rotated relative to the switch housing 5 within the range in which the circumferential groove 13 is formed.

[0036] Furthermore, a fixing mechanism 15 is formed near the tip of the circumferential groove 13. The fixing mechanism 15 is the part that fixes the protrusion 23, and is a small projection formed at mutually opposing positions above and below the circumferential groove 13. The mounting structure between the rotary switch 3 and the switch housing 5 and the fixing mechanism 15 will be described in detail later.

[0037] Figure 6(a) is a cross-sectional view along line AA in Figure 5(b), and Figure 6(b) is a cross-sectional view along line BB in Figure 5(b). The conductive portion 17 is formed by bending a springy metal member and has a central fixing portion 17a and terminal contact portions 17b at both ends. More specifically, the fixing portion 17a is formed in a substantially inverted V shape and is arranged inside the main body portion 7, and the terminal contact portions 17b are formed by folding back from both ends of the fixing portion 17a so that a portion of it protrudes outward.

[0038] The conductive portion 17 can be made of materials such as stainless steel, iron, or copper. The conductive portion 17 can be manufactured using any method, including forging, casting, pressing, or sheet metal processing. Surface treatment of the conductive portion 17 is not strictly necessary, but the material may be plated, and the type of plating is not limited to tin, silver, gold, or nickel.

[0039] A locking claw 19 is formed on the outer surface of the fixing portion 17a. The fixing portion 17a is inserted from below the main body portion 7, and the locking claw 19 is locked to a locking portion 21 formed inside the main body portion 7, thereby fixing the conductive portion 17 to the main body portion 7. Note that the method of fixing the conductive portion 17 and the main body portion 7 may be by other means.

[0040] Since the pair of terminal contact portions 17b are continuous via the fixing portion 17a, the terminal contact portions 17b are electrically connected to each other. Furthermore, since the terminal contact portions 17b are elastically deformable, when they come into contact with the terminals described later, the elastic deformation of the terminal contact portions 17b allows them to be pressed more reliably against the terminals, thereby ensuring electrical connection.

[0041] Next, the method for attaching the rotary switch 3 to the switch housing 5 will be described. Figure 7(a) shows the process of attaching the rotary switch 3 to the switch housing 5. As mentioned above, a pair of opposing protrusions 23 are formed on the upper inner surface of the switch housing 5. In addition, a pair of axial grooves 11 are formed on the outer circumferential surface of the rotary switch 3.

[0042] First, the rotary switch 3 is inserted into the switch housing 5 by aligning the axial groove 11 of the main body 7 with the protrusion 23 of the switch housing 5. Here, the outer diameter of the axial groove 11 and the circumferential groove 13 is larger than the inner diameter (distance) of the pair of protrusions 23, and the outer diameter of the parts other than the axial groove 11 and the circumferential groove 13 is larger than the inner diameter (distance) of the protrusions 23. Therefore, as shown in Figure 7(b), when the protrusion 23 is inserted up to the upper end of the axial groove 11 (the end of the circumferential groove 13), the rotary switch 3 is positioned in the insertion direction without being inserted any further into the switch housing 5.

[0043] Figure 8 is a cross-sectional view perpendicular to Figure 7(b) (in the direction opposite to the terminals 25). In this state, the direction opposite to the terminals 25 and the direction opposite to the terminal contact portions 17b are orthogonal to each other, and the terminal contact portions 17b and terminals 25 do not come into contact. Therefore, the terminals 25 do not conduct electricity, and the disconnection detection circuit 61 is in an open state (not conducting electricity). In other words, because the disconnection detection circuit 61 is open, the high-voltage circuit 65 is shut off.

[0044] Figures 9(a) and 9(b) show the state after the rotary switch 3 has been rotated relative to the switch housing 5 from this state, and correspond to Figures 7(b) and 8, respectively. When the rotary switch 3 is rotated, the protrusion 23 moves relative to the circumferential groove 13.

[0045] As the rotary switch 3 rotates, the conductive portion 17 rotates within the switch housing 5. As a result, the opposing directions of the terminals 25 and the opposing directions of the terminal contact portions 17b coincide. At this time, the maximum outer diameter (maximum distance between the outer surfaces) of the opposing terminal contact portions 17b is greater than the distance between the inner surfaces of the terminals 25. Therefore, each terminal contact portion 17b elastically deforms and comes into contact with the terminals 25. In other words, the terminals 25 become electrically connected via the conductive portion 17, and the disconnection detection circuit 61 becomes closed (conductive). Consequently, because the disconnection detection circuit 61 is closed, the high-voltage circuit 65 becomes capable of receiving power.

[0046] Here, the rotary switch 3 is rotated to create electrical conductivity between the terminals 25 via the conductive part 17, closing the disconnection detection circuit 61, which is defined as the first state. Furthermore, the rotary switch 3 is rotated in the opposite direction from the first state, separating the conductive part 17 from the terminals 25 and opening the disconnection detection circuit 61, which is defined as the second state. In other words, the first and second states can be switched by rotating the rotary switch 3.

[0047] Figure 10 is an enlarged view of the vicinity of the tip of the circumferential groove 13 when the rotary switch 3 is rotated from the second state to the first state. As shown in Figure 10(a), when the rotary switch 3 is rotated relative to the protrusion 23 (switch housing 5) in the direction of the arrow, the protrusion 23 moves relative to the circumferential groove 13.

[0048] As mentioned above, a fixing mechanism 15 is formed near the tip of the circumferential groove 13. The fixing mechanism 15 is a projection formed above and below the tip of the circumferential groove 13 at a distance corresponding to the convex portion 23. In other words, the groove width of the circumferential groove 13 is narrowed at the location of the fixing mechanism 15.

[0049] The maximum diameter (maximum height) of the protrusion 23 is slightly larger than the distance between the protrusions in the fixing mechanism 15. Therefore, when the rotary switch 3 is rotated and the protrusion 23 moves to the position of the fixing mechanism 15, the protrusion collapses slightly due to elastic deformation, and the protrusion 23 moves between the protrusions.

[0050] Figure 10(b) shows the state in which the protrusion 23 has moved beyond the fixing mechanism 15 (i.e., the first state). When the protrusion 23 moves beyond the fixing mechanism 15, the elastic deformation of the protrusion is restored, and the distance between the protrusions becomes narrower than the maximum diameter (maximum height) of the protrusion 23. As a result, the movement of the protrusion 23 from this position is restricted. In other words, the position of the protrusion 23 is fixed in the circumferential groove 13 by the fixing mechanism 15 formed in the circumferential groove 13, and the rotary switch 3 is fixed to the switch housing 5.

[0051] Furthermore, by rotating the rotary switch 3 in the reverse direction from the first state, the protrusion 23 moves relative to the fixing mechanism 15, allowing the device to switch to the second state. In the second state, since the protrusion 23 is located in the axial groove 11, the rotary switch 3 can be removed from the switch housing 5. Thus, in the first state, the protrusion 23 is located in a different location from the axial groove 11, and the main body 7 is fixed to the switch housing 5, while in the second state, the protrusion 23 is located in the axial groove 11, and the main body 7 can be removed from the switch housing 5.

[0052] In this embodiment, the rotary switch 3 can be removed from the switch housing 5 in the second state when the wire break detection circuit 61 is shut off. However, it is also possible to intentionally prevent the rotary switch 3 from being removed from the switch housing 5 in the second state. Furthermore, the power distribution box 59 may be equipped with an indicator unit (such as a lamp) that allows visual confirmation of the continuity state of the wire break detection circuit 61 and the shut-off state of the high-voltage circuit 65.

[0053] As described above, according to this embodiment, the power distribution box 59 is placed on the disconnection detection circuit 61 for shutting off the high-voltage circuit 65, and the disconnection unit 67 for shutting off the disconnection detection circuit 61 is placed on the power distribution box 59. As a result, it is not necessary to access the battery 55 when shutting off the high-voltage circuit 65, as in the conventional method. Furthermore, since the power distribution box 59 is located in the engine compartment regardless of the vehicle model, there is no need to check its location or use special tools. In addition, the rotary switch 3 has an extremely simple structure and can be easily inserted into and removed from the switch housing 5. Therefore, maintenance work is easy.

[0054] Furthermore, since the interruption unit 67 is positioned between the terminals 25 of the wire break detection circuit 61, to which a voltage smaller than the voltage applied to the high-voltage circuit 65 is loaded, it is possible to suppress the generation of arcs and other issues that occur when the service plug is removed from the high-voltage circuit 65 during operation of the rotary switch 3.

[0055] Furthermore, while a typical service plug is located on a circuit in the battery 55 that is in contact with a high-voltage circuit or a wire break detection circuit, in this embodiment, a circuit to the service plug in the battery 55 is unnecessary, thus reducing the amount of wire or busbar used.

[0056] Furthermore, in the first state, when the wire break detection circuit 61 is in a conductive state, a fixing mechanism is formed to restrict the rotation of the rotary switch 3, thereby preventing the rotary switch 3 from rotating unintentionally due to vibration or the like, and maintaining the first state.

[0057] Although embodiments of the present invention have been described above with reference to the attached drawings, the technical scope of the present invention is not limited to the embodiments described above. It is clear to those skilled in the art that various modifications or alterations can be conceived within the scope of the technical idea described in the claims, and these will naturally also fall within the technical scope of the present invention. [Explanation of Symbols]

[0058] 1……Planning structure 3… Rotary switch 5… Switch Housing 7...Main body 9... Snacks 11……Axial groove 13……Circumferential groove 15……Fixing mechanism 17... Conductive section 17a……Fixed part 17b……Terminal contact part 19… Locking claw 21... Locking part 23………Convex part 25... Terminals 51... Motor 53………Inverter 55... Battery 57………ECU 59... Power distribution box 61………Disconnection detection circuit 65... High-voltage circuits 67... Blocking section 100……Planning structure 101... Motor 103... Inverter 105... Battery 107...ECU 109... Power distribution box 111... Service plug 113... Disconnection detection circuit 115... High-voltage circuit

Claims

1. A power distribution box for automobiles having a wire break detection circuit capable of shutting off a high-voltage circuit, The power distribution box has a breaker unit located in the wire break detection circuit, The interruption unit comprises a switch housing and a rotary switch that performs an operation to open and close the electrical connection between terminals arranged inside the switch housing. A power distribution box characterized in that the high-voltage circuit can be shut off by opening the wire break detection circuit through the operation of the rotary switch.

2. The inner surface of the switch housing has protrusions formed in opposing directions, The rotary switch has a main body and a conductive part attached to the main body. The power distribution box according to claim 1, characterized in that a circumferential groove is formed on the outer circumference of the main body portion in a predetermined range in the circumferential direction, into which the protrusion portion can be fitted, and the main body portion can be rotated relative to the switch housing when the protrusion portion is fitted into the circumferential groove.

3. In the first state, when the rotary switch is turned, the conductive portion allows electrical conductivity between the terminals, closing the disconnection detection circuit; in the second state, when the rotary switch is turned in the opposite direction, the conductive portion separates from the terminals, opening the disconnection detection circuit. The power distribution box according to claim 2, characterized in that an axial groove is formed on the outer periphery of the main body, which is continuous with the circumferential groove and substantially perpendicular to the circumferential groove, in the first state, the protrusion is located in a location different from the axial groove and the main body is fixed to the switch housing, and in the second state, the protrusion is located in the axial groove and the main body can be removed from the switch housing.

4. The power distribution box according to claim 3, characterized in that a fixing mechanism for fixing the position of the protrusion in the first state is formed in the circumferential groove.

5. The conductive portion is formed by bending a springy metal member and has a central fixing portion and terminal contact portions at both ends. The power distribution box according to claim 2, characterized in that a locking claw is formed on the outer surface of the fixing part, and the locking claw is locked and fixed to a locking part inside the main body.

6. A wiring structure for an automobile having a power distribution box according to any one of claims 1 to 5, It has a high-voltage circuit and a disconnection detection circuit that shuts off the high-voltage circuit when the wire is disconnected. The power distribution box has terminals that constitute part of the wire break detection circuit and a breaker that can interrupt the electrical connection between the terminals. A wiring structure for an automobile, characterized in that the high-voltage circuit can be shut off by opening the disconnection detection circuit through the operation of the rotary switch.

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