Electrical junction box

Abstract

To provide an electric connection box that reduces noise in vehicles by reducing the number of components.SOLUTION: An electric connection box 1A includes a conductive housing 11A that is placed in a vehicle, an input unit 31 that is provided in the housing and receives electric power, an output unit 32 that is provided in the housing 11A and outputs electric power, and a line (a first electric wire 21 and a second electric wire 22) that connects the input unit 31 and the output unit 32, and a resonant circuit is formed by the inductance component of the line 22 and the capacitance component between the line and the housing 11A, and the line is arranged inside the housing 11A such that the frequency of noise in the vehicle is included in the suppression band that includes the resonant frequency of the resonant circuit.SELECTED DRAWING: Figure 1B

Description

[Technical Field]

[0001] The present invention relates to an electrical junction box. [Background Art]

[0002] As inventions for reducing noise in vehicles, there are, for example, the inventions disclosed in Patent Documents 1 and 2. The on-vehicle power supply device disclosed in Patent Document 1 includes a DC / DC converter including a noise generation source, one or more output terminals capable of connecting a load to an output of the DC / DC converter, and an adjustment unit accommodating one or more capacitors that affect an impedance at the output of the DC / DC converter, and a unit support section that detachably supports the adjustment unit. In this invention, by replacing the adjustment unit according to the impedance of the connected load, noise can be suppressed corresponding to the impedance.

[0003] In the resonance noise mitigation structure disclosed in Patent Document 2, external wiring having a shield coating is connected via a connector to an electrical device accommodated in a grounded conductive housing. The connector is inserted into the housing through an opening formed in the housing and fixed to the housing via a conductive flange, and the shield coating is connected to the housing via the flange. In this housing, ground conductors opposed at intervals along a transmission path including the external wiring and a connector terminal connected to the external wiring are provided up to the position of the opening. A connector terminal is crimped to a tip end of the external wiring, and the connector terminal is connected to an internal terminal connected to an internal wiring connected to the electrical device. A characteristic impedance of a transmission line extending from the internal wiring to the internal terminal, the connector terminal, and the external wiring changes uniformly or gently along the transmission direction by the housing or the ground conductor which is an external conductor at a ground potential. Accordingly, reflection of noise current in the transmission direction of the transmission line is suppressed, electromagnetic energy reaching the internal terminal is efficiently transmitted to the connector terminal, and resonance noise is significantly mitigated. [Prior Art Literature] [Patent Documents]

[0004] [Patent Document 1] Patent No. 7116028 [Patent Document 2] Patent No. 6556515 [Overview of the project] [Problems that the invention aims to solve]

[0005] The invention disclosed in Patent Document 1 requires the preparation of multiple units to accommodate the impedance of the connected load, increasing the number of components for noise suppression and incurring the time and cost of replacing the adjustment unit. The invention disclosed in Patent Document 2 requires the provision of a ground conductor on all connected external wiring, resulting in a large number of components for noise suppression.

[0006] The present invention has been made in view of the above, and aims to reduce noise in a vehicle by reducing the number of parts. [Means for solving the problem]

[0007] To solve the above-mentioned problems and achieve the objective, the electrical connection box according to the present invention comprises a conductive housing that is placed in a vehicle, an input section provided in the housing into which power is input, an output section provided in the housing into which power is output, and a line connecting the input section and the output section, wherein a resonant circuit is formed by the inductance component of the line and the capacitance component between the line and the housing, and the line is routed within the housing such that the noise frequency in the vehicle is included in the suppression band including the resonant frequency of the resonant circuit.

[0008] In one aspect of the present invention, the electrical connection box may be configured such that the lines are routed at a constant distance from the bottom surface of the housing.

[0009] An electrical junction box according to one aspect of the present invention may be configured such that the lines are arranged in a loop.

[0010] In an electrical junction box according to one aspect of the present invention, the inductance component of the resonant circuit may include an inductance component formed by the wire connecting the resistor on the substrate arranged in the housing to the transmission line.

[0011] In an electrical junction box according to one aspect of the present invention, the transmission line may be configured to have rigidity such that it does not deform under its own weight when the input section and the output section are connected.

[0012] An electrical junction box according to one aspect of the present invention may have an insulating resin layer between the line and the housing in contact with the line and the housing, and the capacitance component may be a capacitance component formed by the resin layer.

[0013] In an electrical junction box according to one aspect of the present invention, the capacitance component of the resonant circuit may include a capacitance component formed by a resin molded product placed between the transmission line and the housing.

[0014] In an electrical junction box according to one aspect of the present invention, the line may be an electric wire with an insulating coating over a conductor, and the capacitance component may be a capacitance component formed between the electric wire and the housing.

[0015] In an electrical junction box according to one aspect of the present invention, the capacitance component of the resonant circuit may include a capacitance component formed by a monitoring device that is positioned between the transmission line and the housing and monitors the state of the power supply that supplies power to the input section. [Effects of the Invention]

[0016] According to the present invention, it is possible to reduce noise in a vehicle by reducing the number of parts. [Brief explanation of the drawing]

[0017] [Figure 1A]FIG. 1A is a schematic diagram of the electrical junction box according to the first embodiment. [Figure 1B] FIG. 1B is a cross-sectional view taken along line A-A of FIG. 1A. [Figure 2] FIG. 2 is a cross-sectional view of a first electric wire. [Figure 3A] FIG. 3A is a diagram showing the relationship between noise level and noise frequency. [Figure 3B] FIG. 3B is a diagram showing the relationship between noise level and noise frequency. [Figure 4A] FIG. 4A is a schematic diagram of the electrical junction box according to the second embodiment. [Figure 4B] FIG. 4B is a cross-sectional view taken along line B-B of FIG. 4A. [Figure 5] FIG. 5 is a diagram showing the relationship between noise level and noise frequency. [Figure 6A] FIG. 6A is a schematic diagram of the electrical junction box according to the third embodiment. [Figure 6B] FIG. 6B is a cross-sectional view taken along line C-C of FIG. 6A. [Figure 7] FIG. 7 is a diagram showing the relationship between noise level and noise frequency. [Figure 8A] FIG. 8A is a schematic diagram of the electrical junction box according to the fourth embodiment. [Figure 8B] FIG. 8B is a cross-sectional view taken along line D-D of FIG. 8A. [Figure 9] FIG. 9 is a diagram showing the relationship between noise level and noise frequency. [Figure 10A] FIG. 10A is a schematic diagram of the electrical junction box according to the fifth embodiment. [Figure 10B] FIG. 10B is a cross-sectional view taken along line E-E of FIG. 10A. MODE FOR CARRYING OUT THE INVENTION

[0018] Embodiments of the present invention will be described in detail below with reference to the attached drawings. However, the present invention is not limited to the embodiments described below. In the drawings, the same or corresponding elements are appropriately denoted by the same reference numerals. Furthermore, it should be noted that the drawings are schematic, and the dimensional relationships of each element may differ from those in reality. Even between drawings, there may be parts where the dimensional relationships and ratios differ. Also, the Cartesian coordinate system of the X, Y, and Z axes is shown in the drawings as appropriate, and directions are explained using this system. In the space shown in the Cartesian coordinate system, the direction in which the X component increases is called the +X direction, and the direction in which the X component decreases is called the -X direction. Similarly, the Y and Z components are defined as the +Y direction, -Y direction, +Z direction, and -Z direction, respectively.

[0019] [First Embodiment] Figure 1A is a schematic diagram of an electrical junction box 1A according to the first embodiment of the present invention, viewed from the +Z direction, and Figure 1B is a cross-sectional view taken along line AA of Figure 1A. Note that hatching of the cross-section is omitted in Figure 1B. The electrical junction box 1A is an electrical junction box that relays the power supply from a secondary battery mounted on a vehicle to a load. The electrical junction box 1A is installed in, for example, a hybrid vehicle equipped with an electric motor that assists the engine, a plug-in hybrid vehicle, or an electric vehicle that runs solely on an electric motor. Note that the electrical junction box 1A may also be installed in a vehicle that is driven solely by an engine.

[0020] The electrical junction box 1A comprises a housing 11A, connectors 31 and 32 attached to the housing 11A, a first wire 21, and a second wire 22 routed inside the housing 11A. The housing 11A is a conductive metal housing formed in a hollow box shape. The housing 11A has a grounding portion 12 at its lower end for electrical and mechanical connection to the vehicle body B. The grounding portion 12 has a hole through which a bolt passes, and is fixed to the body B by a bolt and nut. Although not shown in Figures 1A and 1B, the +Z side of the housing 11A is closed by a cover, which is also not shown.

[0021] Connectors 31 and 32 are, for example, so-called PN (Positive Negative) connectors. Connector 31 is mounted on the -X side of the housing 11A at a predetermined height from the bottom end. Connector 31, an example of an input section, is electrically connected by a cable (not shown) to another electrical junction box that distributes power supplied by a secondary battery mounted on a vehicle. Connector 32 is mounted on the +X side of the housing 11A at the same height as connector 31. Connector 32, an example of an output section, is electrically connected by a cable (not shown) to an inverter for driving an electric motor.

[0022] Figure 2 is a cross-sectional view of the first electric wire 21. The first electric wire 21 consists of a conductor 21a and an insulating coating 21b. The conductor 21a is formed by twisting together a plurality of conductive strands 210 with a circular cross-section along the radial direction. The insulating coating 21b is an insulating synthetic resin and covers the outer circumference of the conductor 21a. The second electric wire 22 has the same configuration as the first electric wire 21, so its description is omitted. The first electric wire 21 and the second electric wire 22 are examples of the power lines according to the present invention.

[0023] The first wire 21 is connected to connectors 31 and 32, and on the connector 31 side, it is connected to a terminal on connector 31 that is electrically connected to the positive terminal of the secondary battery via a cable. The second wire 22 is connected to connectors 31 and 32, and on the connector 31 side, it is connected to a terminal on connector 31 that is electrically connected to the negative terminal of the secondary battery via a cable. The first wire 21 and the second wire 22 are connected in parallel and in a straight line between connectors 31 and 32, and within the housing 11A, their distance from the bottom surface of housing 11A is constant and they are parallel to the bottom surface of housing 11A.

[0024] In the electrical junction box 1A, as shown in Figure 1B, an inductance component L1 is formed by the first wire 21 and the second wire 22, and a capacitance component C1 is formed between the first wire 21 and the second wire 22 and the housing 11A, thereby forming an LC parallel resonance filter. The resonant frequency of this filter is determined by the inductance component L1 and the capacitance component C1. Since the inductance component L1 is determined by the length (d1) of the first wire 21 and the second wire 22 in the X-axis direction, and the capacitance component C1 is determined by the distance (d2) from the bottom surface of the housing 11A to the first wire 21 and the second wire 22, the resonant frequency can be adjusted by changing the length (d1) of the first wire 21 and the second wire 22 in the X-axis direction and the distance (d2) from the bottom surface of the housing 11A to the first wire 21 and the second wire 22 in the Z-axis direction, thereby reducing noise at frequencies included in the suppression band, which is the frequency band that includes the resonant frequency. The suppression band is a frequency band that includes the resonant frequency, where the noise level falls within a predetermined range from the noise level at the resonant frequency. The range of the suppression band is, for example, ±5MHz to ±50MHz, and this range varies depending on the Q value of the resonant circuit formed by the inductance component L1 and the capacitance component C1. An LC parallel resonance filter is an example of a resonant circuit, and the resonant frequency of this resonant circuit may be set to the frequency of the noise to be reduced in the vehicle.

[0025] Figure 3A is a graph showing the relationship between noise level and noise frequency when d1 of electrical junction box 1A is set to 157 mm and d2 is set to 150 mm, and Figure 3B is a graph showing the relationship between noise level and noise frequency when d1 of electrical junction box 1A is set to 357 mm and d2 is set to 150 mm. In Figure 3A, the noise level decreases around the resonance point of 670 MHz. That is, noise in the frequency band including 670 MHz can be reduced. In contrast, in electrical junction box 1A with d1 set to 357 mm, the inductance component L1 increases as d1 becomes longer, so the resonance frequency decreases, and as shown in Figure 3B, the noise level decreases around the resonance point of 264 MHz. That is, by changing d1 alone, the frequency band of noise that is reduced changes, and noise in the frequency band including 264 MHz can be reduced.

[0026] For example, the relative permeability of the air between the first wire 21 and the second wire 22 and the housing 11A is set to 1, the relative permittivity to 1, d2 to 250 mm, and the area of ​​the first wire 21 and the second wire 22 facing the housing 11A is set to 10 mm per 1 mm of length. 2 Assuming such a scenario, for example, if the noise frequency is within the range of 100Hz to 10MHz, such as noise from wireless power supply to the vehicle's secondary battery, noise from fluctuations in power supply voltage, and noise emitted by the inverter, the length of the second wire 22 should be 770mm or more, and the product of the inductance component L1 and the capacitance component C1 should be 2.5 × 10 -6 ~2.5×10 -16 This allows for the reduction of these noises. Furthermore, if the noise frequency is within the range of 10MHz to 100MHz, such as noise from brushed motors for auxiliary equipment in the vehicle, ignition noise, and noise emitted from wireless equipment mounted on the vehicle, the length of the first wire 21 and the second wire 22 should be 170mm or more, and the product of the inductance component L1 and the capacitance component C1 should be 2.5 × 10 -16 ~2.5×10 -18This allows for the reduction of these noises. Furthermore, if the noise frequency is within the range of 100MHz to 1GHz, such as noise from the clock of a microcomputer mounted on the vehicle for vehicle control, or noise emitted by wireless equipment mounted on the vehicle, the length of the first wire 21 and the second wire 22 should be 31mm or more, and the product of the inductance component L1 and the capacitance component C1 should be 2.5 × 10 -18 ~2.5×10 -20 Therefore, these noises can be reduced.

[0027] Thus, according to this embodiment, in a resonant circuit composed of an inductance component L1 and a capacitance component C1, by adjusting d1 and d2 in response to noise of a specific frequency, the resonant frequency can be matched to the noise frequency to reduce noise inside the vehicle. Furthermore, according to this embodiment, noise inside the vehicle can be reduced using only the components used for wiring, without the need for filter circuits using electrical components or noise suppression circuits and components such as ferrite.

[0028] [Second Embodiment] Figure 4A is a schematic diagram of the electrical junction box 1B according to the second embodiment of the present invention, viewed from the +Z direction, and Figure 4B is a cross-sectional view taken along the BB line in Figure 4A. In the following description, components identical to those in the first embodiment are denoted by the same reference numerals and their descriptions are omitted. The electrical junction box 1B comprises a housing 11B, connectors 31 and 32 attached to the housing 11B, a first busbar 23A, and a second busbar 24A.

[0029] The housing 11B is a conductive metal housing formed in a hollow, box-like shape. The housing 11B is equipped with a grounding portion 12 at its lower end for electrical and mechanical connection to the vehicle body B. Although not shown in Figures 4A and 4B, the +Z side of the housing 11B is closed by a cover, which is also not shown.

[0030] The first busbar 23A and the second busbar 24A are formed into loops by bending a conductive metal plate, and have portions along the Y-axis at both ends in the X-axis direction. The first busbar 23A is connected to connectors 31 and 32, and on the connector 31 side, it is connected to a terminal on connector 31 that is electrically connected to the positive electrode of a secondary battery via a cable. The second busbar 24A is connected to connectors 31 and 32, and on the connector 31 side, it is connected to a terminal on connector 31 that is electrically connected to the negative electrode of a secondary battery via a cable. The first busbar 23A and the second busbar 24A are examples of a transmission line according to the present invention. The first busbar 23A and the second busbar 24A have rigidity that prevents deformation by their own weight when connected to connectors 31 and 32.

[0031] In the electrical junction box 1B, as shown in Figure 4B, an inductance component L2 is formed by the first busbar 23A and the second busbar 24A, and a capacitance component C2 is formed between the first busbar 23A and the second busbar 24A and the housing 11B, thereby forming an LC parallel resonance filter. The resonant frequency of this filter is determined by the inductance component L2 and the capacitance component C2. By replacing the conductor connecting connector 31 and connector 32 with a busbar instead of a wire, the inductance component L2 and the capacitance component C2 can be increased, the resonant frequency can be lowered, and the noise level at low frequencies can be reduced.

[0032] Figure 5 is a graph showing the relationship between noise level and noise frequency when using electrical junction box 1B. By using busbars instead of wires, the inductance and capacitance components become larger than those of wires, resulting in a lower resonant frequency. In Figure 5, the noise level decreases at 110 MHz, which is a lower resonant point than in the first embodiment.

[0033] Furthermore, in the electrical junction box 1B, the inductance component L2 is determined by the lengths of the first bus bar 23A and the second bus bar 24A, and the capacitance component C2 is determined by the distance from the bottom surface of the housing 11B to the first bus bar 23A and the second bus bar 24A. By changing the length of the first bus bar 23A and the distance from the bottom surface of the housing 11B to the first bus bar 23A, the resonant frequency can be adjusted, and by matching the resonant frequency to the frequency of noise that needs to be reduced inside the vehicle, noise inside the vehicle can be reduced.

[0034] [Third Embodiment] Figure 6A is a schematic diagram of the electrical junction box 1C according to the third embodiment of the present invention, viewed from the +Z direction, and Figure 6B is a cross-sectional view of Figure 6A along the CC line. Note that components identical to those in the first and second embodiments are denoted by the same reference numerals and their descriptions are omitted. The electrical junction box 1C comprises a housing 11C, connectors 31, 32, and 33 attached to the housing 11C, first busbars 23B and 23C, second busbars 24B and 24C, a resin molded product 41, a monitoring device 51, a first adjustment unit 81, and second adjustment units 91 and 92.

[0035] The housing 11C is a conductive metal housing formed in a hollow, box-like shape. The housing 11C is equipped with a grounding portion 12 at its lower end for electrical and mechanical connection to the vehicle body B. Although not shown in Figures 6A and 6B, the +Z side of the housing 11C is closed by a cover, which is also not shown.

[0036] Connector 31 is located on the -Y side of the housing 11C at a predetermined height from the bottom end. Connector 31 is electrically connected by a cable (not shown) to another electrical junction box that distributes power supplied by a secondary battery mounted on a vehicle. Connector 32 is located on the -Y side of the housing 11C at the same height as connector 31. Connector 32 is electrically connected by a cable (not shown) to an inverter for driving an electric motor. Connector 33 is located on the -Y side of the housing 11C at the same height as connector 31. Connector 33 is electrically connected by a cable (not shown) to another electrical junction box that relays power from a charger that charges a secondary battery.

[0037] The first busbar 23B and the second busbar 24B are formed by bending a conductive, strip-shaped metal plate. The first busbar 23B is connected to connector 31, connector 32, and the first relay 61, and on the connector 31 side, it is connected to a terminal on connector 31 that is electrically connected to the positive electrode of the secondary battery via a cable. The second busbar 24B is connected to connector 31, connector 32, and the second relay 62, and on the connector 32 side, it is connected to a terminal on connector 32 that is electrically connected to the negative electrode of the secondary battery via a cable.

[0038] The first busbar 23C is a conductive strip of metal. The first busbar 23C is connected to the first relay 61 and the connector 33. The second busbar 24C is a conductive metal. The second busbar 24C is connected to the second relay 62 and the connector 33.

[0039] The first relay 61 is a so-called electromagnetic relay that switches between an electrically connected state and an unconnected state of the first busbar 23B and the first busbar 23C based on an external signal. The second relay 62 is a so-called electromagnetic relay that switches between an electrically connected state and an unconnected state of the second busbar 24B and the second busbar 24C based on an external signal.

[0040] The resin molded product 41 holds the first busbars 23B and 23C, the second busbars 24B and 24C, the first relay 61, and the second relay 62, and is made of, for example, an insulating synthetic resin. The resin molded product 41 holds the first busbars 23B and 23C and the second busbars 24B and 24C in contact with the -Z direction faces of the first busbars 23B and 23C and the -Z direction faces of the second busbars 24B and 24C. The -Z direction face of the resin molded product 41 is in contact with the +Z direction face of the monitoring device 51, and the resin molded product 41 is supported by the monitoring device 51.

[0041] The monitoring device 51 is a device that monitors the status of a secondary battery mounted in a vehicle. The monitoring device 51 has a circuit for monitoring the status of the secondary battery inside a metal housing. The monitoring device 51 is supported on the -Z side by second adjustment parts 91 and 92. The second adjustment parts 91 and 92 support the monitoring device 51 and secure space on the -Z side of the monitoring device 51. The second adjustment parts 91 and 92 are made of metal and are formed in the shape of a hollow box, and are positioned between the first adjustment part 81 and the monitoring device 51. The first adjustment part 81 is made of metal, for example, and is formed in the shape of a hollow box. The first adjustment part 81 is provided between the second adjustment parts 91 and 92 and the housing 11C and adjusts the position of the monitoring device 51 and the resin molded product 41 in the +Z direction.

[0042] In the electrical junction box 1C, as shown in Figure 6B, an inductance component L3 is formed by the first busbar 23B and the second busbar 24B. Also in the electrical junction box 1C, as shown in Figure 6B, a capacitance component C3 is formed between the first busbar 23B and the second busbar 24B and the monitoring device 51, and a capacitance component C4 is formed between the monitoring device 51 and the housing 11C. Furthermore, in the electrical junction box 1C, the magnetic materials of the electromagnetic relays, the first relay 61 and the second relay 62, function as an inductance component L4, and a capacitance component C5 is formed between the first busbar 23C and the second busbar 24C and the housing 11C.

[0043] A filter is formed by the aforementioned inductance components L3 and L4, and capacitance components C3, C4, and C5. The inductance component L3 is determined by the lengths of the first busbar 23B and the second busbar 24B, and the inductance component L4 is determined by the lengths of the first busbar 23C and the second busbar 24C and the magnetic material provided by the first relay 61 and the second relay 62. Furthermore, the capacitance component C3 is determined by the distance from the first busbar 23B and the second busbar 24B to the monitoring device 51, the capacitance component C4 is determined by the distance from the monitoring device 51 to the bottom surface of the housing 11C, and the capacitance component C5 is determined by the distance from the first busbar 23C and the second busbar 24C to the bottom surface of the housing 11C. Therefore, by changing these lengths and distances, the resonant frequency of the filter can be adjusted, and noise at the same frequency as the resonant frequency can be reduced. In addition, the inductance components formed in the third embodiment also contribute to reducing the Q value.

[0044] Figure 7 is a graph showing the relationship between noise level and noise frequency when using the electrical junction box 1C. The inductance and capacitance components increase with the lengths of the first busbars 23B and 23C, the second busbars 24B and 24C, the distance from the busbars to the bottom surface of the housing 11C, the distance from the busbars to the monitoring device 51, and the distance from the monitoring device 51 to the bottom surface of the housing 11C. As a result, the resonant frequency decreases, and in Figure 7, the noise level decreases at 197 MHz, which is a lower resonant point than in the first embodiment.

[0045] [Fourth Embodiment] Figure 8A is a schematic diagram of the electrical junction box 1D according to the fourth embodiment of the present invention, viewed from the +Z direction, and Figure 8B is a cross-sectional view of Figure 8A along the DD line. Note that components identical to those in the third embodiment are denoted by the same reference numerals and their descriptions are omitted.

[0046] The electrical junction box 1D differs from the electrical junction box 1C of the third embodiment in that it includes a current sensor 71, a third wire 72, a circuit board 73, and a connector 74. The current sensor 71 is a sensor that measures the current value of the current flowing through the first busbar 23B. The circuit board 73 is a circuit board having a chip resistor, which is a resistor, and is mounted on the inner surface of the housing 11C. The resistance value of the chip resistor is, for example, several tens of ohms to several kΩ. The third wire 72 connects the housing of the current sensor 71 to the chip resistor on the circuit board 73, and connects the housing of the current sensor 71 to the connector 74. The connector 74 connects the third wire 72 to the housing of the monitoring device 51.

[0047] In the electrical junction box 1D, as shown in Figure 8B, an inductance component L5 is formed by the current sensor 71, and an inductance component L6 is formed by the third wire 72. A capacitance component C6 is formed between the current sensor 71 and the monitoring device 51, and a capacitance component C7 is formed between the monitoring device 51 and the bottom surface of the housing 11C in the -Z direction from the current sensor 71. A capacitance component C8 is formed between the third wire 72 and the monitoring device 51, and a capacitance component C9 is formed between the monitoring device 51 and the bottom surface of the housing 11C in the -Z direction from the third wire 72. A resistance component R1 is formed between the third wire 72 and the substrate 73. The aforementioned inductance components L5 and L6, capacitance components C6, C7, C8, and C9, and resistance component R1 form a resonant circuit.

[0048] By changing the length of the third wire 72, the inductance component can be changed, and by changing the distance from the current sensor 71 and the third wire 72 to the monitoring device 51, and the distance from the monitoring device 51 to the bottom surface of the housing 11C, the capacitance component can be changed, thereby adjusting the resonant frequency and reducing noise at the same frequency as the resonant frequency.

[0049] [Fifth Embodiment] Figure 10A is a schematic diagram of the electrical junction box 1E according to the fifth embodiment of the present invention, viewed from the +Z direction, and Figure 10B is a cross-sectional view of Figure 10A along line EE. Note that components identical to those in the first embodiment are denoted by the same reference numerals and their descriptions are omitted.

[0050] The electrical junction box 1E is equipped with housing 11E in place of housing 11A. Housing 11E has a lower height in the Z-axis direction than housing 11A. Housing 11E is a conductive metal housing and is formed in a hollow box shape. Housing 11E is equipped with a grounding portion 12 at its lower end for electrical and mechanical connection to the vehicle body B. Although not shown in Figures 10A and 10B, the +Z side of housing 11E is closed by a cover, which is also not shown.

[0051] Furthermore, the electrical junction box 1E has a first busbar 23D in place of the first wire 21 and a second busbar 24D in place of the second wire 22. The first busbar 23D is connected to connector 31 and connector 32, and on the connector 31 side, it is connected to a terminal on connector 31 that is electrically connected to the positive electrode of the secondary battery via a cable. The second busbar 24D is connected to connector 31 and connector 32, and on the connector 31 side, it is connected to a terminal on connector 31 that is electrically connected to the negative electrode of the secondary battery via a cable.

[0052] Furthermore, the electrical junction box 1E has a resin layer 101 that is in contact with the first bus bar 23D and the second bus bar 24. The resin layer 101 is an insulating plate-shaped synthetic resin, and its +Z-direction side is in contact with the -Z-direction side surfaces of the first bus bar 23D and the second bus bar 24D. The -Z-direction side surface of the resin layer 101 is in contact with the +Z-direction side surface of the bottom of the housing 11A.

[0053] In the electrical junction box 1E, an inductance component is formed in the first bus bar 23D and the second bus bar 24D, and a capacitance component is formed between the first bus bar 23D and the second bus bar 24D and the housing 11A, thereby forming an LC parallel resonance filter. In the electrical junction box 1E, because there is a resin layer 101 made of synthetic resin between the first bus bar 23D and the second bus bar 24D and the housing 11A, the capacitance component becomes large, which lowers the resonant frequency and reduces the noise level at low frequencies.

[0054] [Differentiation] Although embodiments of the present invention have been described above, the present invention is not limited to the embodiments described above and can be implemented in various other forms. For example, the present invention may be implemented by modifying the embodiments described above as follows. The embodiments described above and the following modifications may be combined with each other. The present invention is also included in configurations that appropriately combine the components of each embodiment and each modification described above. Furthermore, further effects and modifications can be easily derived by those skilled in the art. Therefore, broader embodiments of the present invention are not limited to the embodiments and modifications described above, and various modifications are possible.

[0055] In the present invention, the first electric wire 21 and the second electric wire 22 are equipped with a conductor 21a formed by twisting together a plurality of strands 210, but a single-strand conductor may be used instead of the conductor 21a. Preferably, this single-strand conductor has rigidity so as not to deform under its own weight when connected to the connectors 31 and 32.

[0056] In the present invention, the electrical connection box according to the first to fifth embodiments may be configured to include an interlocking wire and a connector. [Explanation of Symbols]

[0057] 1A, 1B, 1C, 1D, 1E Electrical junction boxes 11A, 11B, 11C, 11E enclosure 12 Grounding part 21. First power line 22 Second power line 23A, 23B, 23C, 23D First bus bar 24A, 24B, 24C, 24D Second bus bar Connectors 31, 32, and 33 41 Resin molded products 51 Monitoring equipment 61. 1st Relay 62. 2nd Relay 71 Current Sensor 72 Third Electric Line 73 circuit boards 81 1st adjustment section 91, 92 2nd adjustment section 101 Resin layer L1~L6 Inductance Components C1~C9 Capacitance components

Claims

1. A conductive housing that is placed in a vehicle, The aforementioned housing includes an input section into which power is input, The aforementioned housing includes an output unit that outputs power, A line connecting the input unit and the output unit, It has, A resonant circuit is formed by the inductance component of the transmission line and the capacitance component between the transmission line and the housing. The tracks are routed within the housing such that the noise frequency in the vehicle is included in the suppression band, which includes the resonant frequency of the resonant circuit. Electrical junction box.

2. The aforementioned tracks are routed at a constant distance from the bottom surface of the housing. The electrical junction box according to claim 1.

3. The aforementioned railway line is laid out in a loop shape. The electrical junction box according to claim 2.

4. The inductance component of the resonant circuit includes the inductance component formed by the wires connecting the resistors on the substrate arranged in the housing to the transmission line. The electrical junction box according to claim 1.

5. The aforementioned track has the rigidity to not deform under its own weight when the input and output sections are connected. The electrical junction box according to claim 1.

6. The aforementioned line and the housing are in contact with an insulating resin layer, and there is an insulating resin layer between the line and the housing. The capacitance component is the capacitance component formed by the resin layer. The electrical junction box according to claim 5.

7. The capacitance component of the resonant circuit includes the capacitance component formed by the resin molded product placed between the transmission line and the housing. The electrical junction box according to claim 1.

8. The aforementioned line is an electric wire with an insulating coating over the conductor. The capacitance component is the capacitance component formed between the electric wire and the housing. The electrical junction box according to claim 1.

9. The capacitance component of the resonant circuit includes a capacitance component formed by a monitoring device that monitors the state of the power supply that provides power to the input section and is positioned between the transmission line and the housing. The electrical junction box according to claim 1.

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