Electrical junction box

Abstract

The invention provides an electrical connection box capable of suppressing vibration of a bus bar. The present invention is provided with: a bus bar (10) having a flat-plate-shaped bus bar base part (11) and a male-tab-shaped bus bar terminal connection part (12A) provided upright from the bus bar base part; a relay member (20) provided with a relay terminal connection part (22); a relay terminal fitting (30) physically and electrically connected to the bus bar terminal connection part and physically and electrically connected to the relay terminal connection part; and a housing (40) that houses the bus bar, the relay component, and the relay terminal fitting, the housing being provided with: a housing member (50) in which a bus bar housing chamber (51) that houses the bus bar is formed; and a cover member (60) that covers the bus bar together with the housing member, the bus bar is provided with at least one vibration damping portion (13) that dampens vibration accompanying driving of the relay member propagating through the bus bar terminal connection portion to the bus bar base portion, and the bus bar base portion is sandwiched between the housing member and the cover member via the vibration damping portion.

Description

Technical Field

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

[0002] The busbar is housed in a frame of an electrical connection box such as a junction box, and electrically connects at least two electrically connected components. The busbar is, for example, a plate-shaped conductive component formed by stamping a metal plate as a base material, and has a terminal connection portion formed in the shape of a male tab that is directly or indirectly connected to the electrically connected component. The following patent document 1 discloses an electrical connection box having such a busbar.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Publication No. 2010-259228 Summary of the invention

[0006] Technical problem that the invention aims to solve

[0007] However, in the busbar, when the electrically connected object component is a relay component that can serve as a vibration source, the vibration associated with the driving of the relay component will be transmitted to the terminal connection part, and the vibration will propagate from the terminal connection part as a starting point. Moreover, in the frame of the electrical connection box, the busbar is accommodated with some play (looseness), so it is possible to generate abnormal noise caused by the vibration of the busbar. In addition, the busbar is sometimes electrically connected to the relay component via a relay terminal accessory. In this case, the male tab-shaped terminal connection part of the busbar is indirectly connected to the male tab-shaped terminal connection part of the relay component through the relay terminal accessory. Here, in the busbar, when the relay terminal accessory physically and electrically connects the terminal connection part using a spring force, it is sufficient to absorb the vibration associated with the driving of the relay component and attenuate it by using the relay terminal accessory, but the vibration may also be amplified in the relay terminal accessory and transmitted to the terminal connection part.

[0008] Therefore, an object of the present invention is to provide an electrical connection box capable of suppressing vibration of a bus bar.

[0009] Technical solutions to the problem

[0010] The present invention is characterized in that it comprises: a bus bar having a flat bus bar base and a bus bar terminal connection portion in the shape of a male tab rising from the bus bar base; a relay component, the relay component being provided with a relay terminal connection portion; a relay terminal accessory, the relay terminal accessory being physically and electrically connected to the bus bar terminal connection portion and physically and electrically connected to the relay terminal connection portion; and a frame, the frame accommodating the bus bar, the relay component and the relay terminal accessory, the frame comprising: a shell component, the shell component forming a bus bar accommodating chamber for accommodating the bus bar; and a cover component, the cover component covering the bus bar together with the shell component, at least one vibration attenuation portion being provided on at least one of the bus bar and the frame, the vibration attenuation portion attenuating vibration associated with driving of the relay component that is transmitted to the bus bar base via the bus bar terminal connection portion, and the bus bar base is clamped between the shell component and the cover component via the vibration attenuation portion.

[0011] Effects of the Invention

[0012] The electrical connection box of the present invention can attenuate the vibration accompanying the driving of the relay component transmitted to the busbar base via the busbar terminal connection portion by using the vibration attenuation portion provided on either the busbar base or the cover component. Therefore, the electrical connection box can suppress the vibration of the busbar and suppress the generation of abnormal noise caused by the vibration. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is an exploded perspective view illustrating the electrical junction box according to the embodiment.

[0014] Figure 2 This is a perspective view for explaining the electrical junction box according to the embodiment.

[0015] Figure 3 It is a plan view showing the bus bar and the relay terminal fittings accommodated in the bus bar accommodation chamber.

[0016] Figure 4 is Figure 2 A cross-sectional view showing the periphery of the relay terminal fitting extracted in the X1-X1 line cross section.

[0017] Figure 5 This is a diagram showing an example of simulation analysis results of an equivalent radiation power level related to a bus bar provided with a vibration attenuation portion.

[0018] Figure 6 This is a diagram showing another example of the simulation analysis result of the equivalent radiation power level related to the bus bar when the vibration attenuation unit is provided on the cover member.

[0019] Figure 7 This is a diagram showing another example of the simulation analysis result of the equivalent radiation power level related to the bus bar when the vibration attenuation unit of another embodiment is provided on the cover member.

[0020] Figure 8 It is a plan view showing an example of a bus bar provided with a vibration damping portion.

[0021] Fig. 9 yes Figure 8 The X2-X2 line cross-sectional view shows the clamping state of the bus bar between the shell component and the cover component.

[0022] Fig.10 This is a plan view showing a part of an example of a cover member provided with a vibration damping portion.

[0023] Fig.11 yes Fig.10 The X3-X3 line cross-sectional view shows the clamping state of the bus bar between the shell component and the cover component.

[0024] Fig.12 This is a plan view showing a part of an example of a cover member provided with a vibration damping portion of another type.

[0025] Fig.13 Yes Fig.12 The figure in which the cross section taken along the line YY is rotated 90 degrees shows a state in which the bus bar is clamped by the case member and the cover member.

[0026] Description of Reference Numerals

[0027] 1Electrical connection box

[0028] 10. 10A busbar

[0029] 11 Bus bar base

[0030] 12A busbar terminal connection

[0031] 13, 64, 65 vibration attenuation part

[0032] 20 Relay components

[0033] 22 Relay terminal connection

[0034] 30 Relay terminal accessories

[0035] 40 Frame

[0036] 50 Housing parts

[0037] 51 Bus bar storage room

[0038] 60, 60A, 60B, 60C cover parts DETAILED DESCRIPTION

[0039] Hereinafter, an embodiment of the electric junction box according to the present invention will be described in detail based on the drawings. However, the present invention is not limited to the embodiment.

[0040] [Implementation Method]

[0041] based on Figures 1 to 13 One embodiment of the electrical junction box according to the present invention will be described.

[0042] Figure 1 The reference numeral 1 shown in the figure indicates an electrical connection box of the present embodiment. The electrical connection box 1 is called a junction box, etc., and electrically connects at least two electrically connected components. The electrical connection box 1 includes a bus bar 10, a relay component 20 as an electrically connected component, a relay terminal fitting 30 between the bus bar 10 and the relay component 20, and a frame 40 ( Figure 1 as well as Figure 2 In the electrical connection box 1, the relay component 20 is electrically connected to other electrically connected components via the bus bar 10 and the relay terminal fittings 30 ( Figure 1 ).

[0043] The bus bar 10 is a conductive component formed into a plate shape from a conductive material such as a metal material. For example, the bus bar 10 is formed by stamping using a metal plate as a base material. The bus bar 10 has a flat plate-shaped base (hereinafter referred to as the "bus bar base") 11 and a male tab-shaped terminal connection portion (hereinafter referred to as the "bus bar terminal connection portion") 12 ( Figure 1 and Figure 3 The bus bar 10 shown here has a plurality of bus bar terminal connection portions 12, and the relay component 20 is electrically connected to one of the plurality of bus bar terminal connection portions 12 (hereinafter referred to as "bus bar terminal connection portion 12A") via a relay terminal fitting 30 ( Figure 1 , Figure 3 as well as Figure 4 ).

[0044] Here, the relay component 20 includes a relay body 21 and a terminal connection portion (hereinafter referred to as a “relay terminal connection portion”) 22 protruding from the relay body 21. The relay component 20 shown here is provided with the relay terminal connection portion 22 formed in a male tab shape.

[0045] The relay terminal fitting 30 has an electrical connection portion 31 in the tube of the cylindrical terminal body 32, and the electrical connection portion 31 is physically and electrically connected to the busbar terminal connection portion 12A and physically and electrically connected to the relay terminal connection portion 22 ( Figure 4 ). Therefore, the busbar terminal connection portion 12A is electrically connected to the relay terminal connection portion 22 via the relay terminal fitting 30. The relay terminal fitting 30 shown here is formed by press-molding using a metal plate as a base material.

[0046] The electrical connection portion 31 is bent and deformed as the busbar terminal connection portion 12A is inserted, so that its reaction force (spring force) acts on the plane of the busbar terminal connection portion 12A, and the busbar terminal connection portion 12A is clamped between the electrical connection portion 31 and the inner wall surface of the terminal body 32 ( Figure 4 ). Therefore, the busbar terminal connection portion 12A is physically and electrically connected to the relay terminal fitting 30 by utilizing the spring force of the relay terminal fitting 30 acting on the plane of the busbar terminal connection portion 12A. In addition, the electrical connection portion 31 is flexed and deformed as the relay terminal connection portion 22 is inserted, so that its reaction force (spring force) acts on the plane of the relay terminal connection portion 22, and the relay terminal connection portion 22 is clamped between the electrical connection portion 31 and the inner wall surface of the terminal body 32 ( Figure 4 ). Therefore, the relay terminal connection portion 22 is physically and electrically connected to the relay terminal fitting 30 by utilizing the spring force of the relay terminal fitting 30 acting on the plane of the relay terminal connection portion 22. However, here, the relay terminal connection portion 22 is clamped between the bulging portion 33 bulging from the inner wall surface of the terminal body 32 and the electrical connection portion 31. The electrical connection portion 31 shown here is formed into a U-shape clamped by the busbar terminal connection portion 12A and the relay terminal connection portion 22 in the tube of the terminal body 32, so that mutually opposite reaction forces (spring forces) act on the busbar terminal connection portion 12A and the relay terminal connection portion 22.

[0047] As described above, the electrical connection box 1 includes a frame 40 that accommodates the bus bar 10, the relay component 20, and the relay terminal fittings 30. The frame 40 includes a housing component 50 and a cover component 60 (molded from an insulating material such as synthetic resin and assembled to each other). Figure 1 ).

[0048] The case member 50 is formed with a housing chamber 51 (hereinafter referred to as a “bus bar housing chamber”) for housing the bus bar 10. Figure 1 and Figure 3 ). The bus bar 10 is accommodated in the bus bar accommodation chamber 51 in a state where the relay terminal fittings 30 are assembled to the bus bar terminal connecting portion 12A. Therefore, the relay terminal fittings 30 are also accommodated in the bus bar accommodation chamber 51 .

[0049] The cover member 60 is assembled to the housing member 50 to cover the housing member 50 together with the bus bar 10. The cover member 60 shown here covers the bus bar 10 and the relay terminal fitting 30 together. Therefore, the cover member 60 is formed with a through hole for inserting the relay terminal connecting portion 22 into the relay terminal fitting 30. In addition, in the cover member 60, a vertical wall surrounding the through hole is provided on the outer wall surface, and the space inside the vertical wall is used as a storage chamber 61 (hereinafter referred to as a "relay storage chamber") for the relay member 20. Figure 1 ).

[0050] In addition, in the cover member 60, a part of its vertical wall is cut away, and a holding portion (hereinafter referred to as "relay holding portion") 62 ( Figure 1 The relay holding portion 62 constitutes a so-called locking mechanism that is hooked on the claw portion 23 protruding from the outer wall surface of the relay body 21 to hold the claw portion 23 ( Figure 1 ).

[0051] In the frame 40, the housing member 50 does not have a holding mechanism for holding the bus bar 10 in the bus bar storage chamber 51 (for example, a mechanism for holding the bus bar 10 in the bus bar storage chamber 51 by providing a through hole in the bus bar 10 and providing a claw inserted into the through hole in the vertical wall of the bus bar storage chamber 51, and hooking the claw on the periphery of the through hole). However, in the frame 40, the bus bar 10 is indirectly held relative to the cover member 60 via the relay member 20 held by the cover member 60 and the relay terminal fitting 30 to which the relay terminal connection portion 22 of the relay member 20 is fitted and connected.

[0052] However, in the relay component 20, vibration is generated due to its switching action of being turned on and off, and this vibration is transmitted to the relay terminal connection part 22. In addition, the vibration accompanying the driving of the relay component 20 is transmitted from the relay terminal connection part 22 to the busbar terminal connection part 12A via the relay terminal fitting 30, and propagates from the busbar terminal connection part 12A to the busbar base 11. The busbar 10 is not fixed to the housing component 50, so if the vibration of the relay component 20 is transmitted to the busbar base 11, it is possible that an abnormal sound is generated due to the vibration of the busbar base 11. In addition, even if the busbar 10 in the busbar storage chamber 51 is retained in the housing component 50 by the aforementioned retaining mechanism, the retaining mechanism has a clearance (looseness) between the claw and the through hole, so the busbar 10 can be moved relative to the housing component 50 in the busbar storage chamber 51 by the amount of the clearance. Therefore, even if the bus bar 10 is held by the housing member 50 by the holding mechanism, if the vibration of the relay component 20 is transmitted to the bus bar base 11 , there is a possibility that an abnormal sound is generated due to the vibration of the bus bar base 11 .

[0053] Therefore, in the present embodiment, by forming at least one of the bus bar 10 and the frame 40 as described below, the generation of abnormal noise caused by the vibration accompanying the driving of the relay component 20 is suppressed. Specifically, at least one vibration attenuation portion is provided in at least one of the bus bar 10 and the frame 40, and the vibration attenuation portion attenuates the vibration accompanying the driving of the relay component 20 that is transmitted to the bus bar base 11 via the bus bar terminal connection portion 12A. And, the bus bar base 11 is clamped between the housing component 50 and the cover component 60 via the vibration attenuation portion. As a result, in the electrical connection box 1, the vibration accompanying the driving of the relay component 20 that is transmitted to the bus bar base 11 via the bus bar terminal connection portion 12A is absorbed and attenuated by the vibration attenuation portion, and the vibration of the bus bar base 11 can be suppressed.

[0054] Described in detail below, in the electrical connection box 1 of this example, a vibration damping portion is provided on either the bus bar base 11 or the cover member 60 , and the bus bar base 11 is sandwiched between the case member 50 and the cover member 60 via the vibration damping portion.

[0055] The configuration position of the vibration attenuation unit is determined as follows. Here, the equivalent radiation power level ( Figures 5 to 7 ). In the conventional busbar 10conv, no vibration attenuation portion is provided, and the relay component 20 is assembled to the busbar terminal connection portion 12A via the relay terminal fitting 30. As a result of its analysis, in the conventional busbar 10conv, vibration is generated in the vicinity of the busbar terminal connection portion 12A in the busbar base 11 (i.e., in the vicinity of the input portion of the vibration of the relay component 20 in the busbar base 11). Therefore, in the electrical connection box 1 of the present embodiment, the vibration attenuation portion is configured in such a manner that the vicinity of the busbar terminal connection portion 12A in the busbar base 11 (i.e., in the vicinity of the input portion of the vibration of the relay component 20 in the busbar base 11) is clamped by the shell component 50 and the cover component 60. In this example, a vibration attenuation portion of a position and a number that reduces the equivalent radiation power level at a specific frequency (the frequency of the vibration accompanying the drive of the relay component 20) Fs is provided.

[0056] First, the vibration damping portion provided in the bus bar base 11 will be described. Figure 8 and Fig. 91 shows a bus bar 10A having a vibration damping portion 13 provided on the bus bar base 11. The vibration damping portion 13 is a spring-shaped portion that uses the elastic force generated between the cover member 60 and the cover member 60 by pressing against the cover member 60 so that the bus bar base 11 is clamped by the housing member 50 and the cover member 60. The vibration damping portion 13 is a spring-shaped portion that protrudes from the first plane 11a of the cover member 60 side of the bus bar base 11 toward the cover member 60, and is formed into a double cantilever beam shape ( Fig. 9 Here, a cover member 60A is used, which includes: an opposing wall 63a, which is arranged opposite to the bus bar base 11 with a gap therebetween; a vertical wall 63b, which is vertically arranged from the opposing wall 63a toward the bus bar base 11; and an opposing wall (hereinafter referred to as "adjacent opposing wall") 63c, which is closer to the bus bar base 11 than the opposing wall 63a via the vertical wall 63b and is arranged adjacent to the vibration attenuation portion 13 ( Fig. 9 ). Therefore, the vibration attenuation portion 13 is a spring-shaped portion protruding from the first plane 11a on the adjacent opposing wall 63c side of the busbar base 11 toward the adjacent opposing wall 63c, and is formed into a double cantilever beam shape in which its middle portion is pressed against the adjacent opposing wall 63c. The vibration attenuation portion 13 presses the middle portion of the pressing portion that presses the cover member 60A against the adjacent opposing wall 63c of the cover member 60A, thereby generating an elastic force between the vibration attenuation portion 13 and the cover member 60A, pressing the second plane 11b on the bottom surface 51a side of the busbar storage chamber 51 of the busbar base 11 against the bottom surface 51a. Therefore, the busbar base 11 is clamped between the bottom surface 51a of the busbar storage chamber 51 and the adjacent opposing wall 63c of the cover member 60A via the vibration attenuation portion 13. In this example, the vibration damping portions 13 are provided at two locations of the bus bar base 11 , and vibration is damped at each location where the vibration damping portion 13 is provided. Figure 5 The solid line indicates the equivalent radiation power level of the bus bar 10A provided with the vibration attenuation portion 13. In the bus bar 10A, the equivalent radiation power level at the specific frequency Fs can be lowered than that of the conventional bus bar 10conv to which the vibration attenuation portion 13 is not applied.

[0057] Next, the vibration damping portion provided in the cover member 60 will be described. The bus bar 10 used here is formed into the same shape as the conventional bus bar 10conv. Fig.10 as well as Fig.11, a cover part 60B having a vibration damping portion 64 is shown. The cover part 60B is the same as the cover part 60A, and has an opposing wall 63a, a vertical wall 63b, and an adjacent opposing wall 63c. The vibration damping portion 64 is a spring-shaped portion that is pressed against the bus bar base 11 and generates an elastic force between the bus bar base 11 and the cover part 60B, so that the bus bar base 11 is clamped by the shell part 50 and the cover part 60B. The vibration damping portion 64 is a spring-shaped portion that protrudes from the adjacent opposing wall 63c of the cover part 60B toward the bus bar base 11, and is formed into a double cantilever beam shape ( Fig.11 ). The vibration damping portion 64 presses the middle portion of the pressing portion that presses the bus bar base 11 against the first plane 11a of the bus bar base 11, thereby generating an elastic force between the bus bar base 11 and the second plane 11b of the bus bar base 11 against the bottom surface 51a of the bus bar storage chamber 51. Therefore, the bus bar base 11 is clamped by the bottom surface 51a of the bus bar storage chamber 51 and the cover member 60B via the vibration damping portion 64. In this example, the vibration damping portion 64 is provided at two locations in the cover member 60B, and vibration is damped at each location of the bus bar base 11 that the vibration damping portion 64 contacts. Figure 6 The solid line indicates the equivalent radiation power level of the bus bar 10 when the vibration attenuation portion 64 is used. In the bus bar 10, the equivalent radiation power level at the specific frequency Fs can be lowered than that of the conventional bus bar 10conv to which the vibration attenuation portion 64 is not applied.

[0058] Next, another embodiment of the vibration damping portion provided in the cover member 60 will be described. The bus bar 10 used here is formed into the same shape as the conventional bus bar 10conv. Fig.12 as well as Fig.13 , a cover part 60C having a vibration damping portion 65 is shown. The cover part 60C has an opposing wall 63a and a vertical wall 63b in the same manner as the cover part 60A, but does not have an adjacent opposing wall 63c. The vibration damping portion 65 is the same as the vibration damping portion 64, and is a spring-shaped portion that clamps the bus bar base 11 between the shell part 50 and the cover part 60C by utilizing the elastic force generated between the bus bar base 11 and the cover part 60C by pressing on the bus bar base 11. However, the vibration damping portion 65 is a spring-shaped portion ( Fig.13 ). For example, in the cover member 60C, the vibration damping portion 65 is made to protrude from the wall surface of the vertical wall 63b. The vibration damping portion 65 has: a cantilevered flexure portion 65a capable of flexural deformation, which protrudes from the wall surface of the vertical wall 63b; and a pressing portion 65b, which is provided at the free end of the flexure portion 65a and can press against the busbar base 11 in the assembled position of the housing member 50 and the cover member 60 ( Fig.12and Fig.13 ). The flexure 65a is flexed and deformed in the direction of assembly and disassembly of the cover member 60C relative to the shell member 50. The vibration attenuation portion 65 presses the pressing portion 65b, which is a pressing portion pressing the bus bar base 11, against the first plane 11a of the bus bar base 11, thereby generating an elastic force between the vibration attenuation portion 65 and the bus bar base 11, and pressing the second plane 11b of the bus bar base 11 against the bottom surface 51a of the bus bar storage chamber 51. Therefore, the bus bar base 11 is clamped by the bottom surface 51a of the bus bar storage chamber 51 and the cover member 60C via the vibration attenuation portion 65. In this example, the vibration attenuation portion 65 is provided at two locations of the cover member 60C, and vibration is attenuated at each location of the bus bar base 11 contacted by the vibration attenuation portion 65. Figure 7 The solid line indicates the equivalent radiation power level of the bus bar 10 when the vibration attenuation portion 65 is used. In the bus bar 10, the equivalent radiation power level at the specific frequency Fs can be lowered than that of the conventional bus bar 10conv to which the vibration attenuation portion 65 is not applied.

[0059] As described above, the electrical connection box 1 of the present embodiment can attenuate the vibration accompanying the driving of the relay component 20 that is transmitted to the bus bar base 11 via the bus bar terminal connection portion 12A by means of the vibration attenuation portion 13, 64, 65 provided on any one of the bus bar base 11 and the cover component 60. Therefore, the electrical connection box 1 can suppress the vibration of the bus bar 10 (10A) and suppress the generation of abnormal noise caused by the vibration of the bus bar 10 (10A). In addition, in the electrical connection box 1, when the vibration accompanying the driving of the relay component 20 is absorbed and attenuated by the relay terminal fitting 30, the propagation of the vibration to the bus bar base 11 can be suppressed, so the generation of abnormal noise caused by the vibration of the bus bar 10 (10A) can be further suppressed. On the other hand, in the electrical connection box 1, even if the vibration accompanying the driving of the relay component 20 is amplified by the relay terminal fittings 30, the vibration attenuation parts 13, 64, 65 are provided at appropriate positions, so that the vibration of the bus bar 10 (10A) can be suppressed, thereby suppressing the generation of abnormal noise caused by the vibration.

[0060] In addition, since the vibration damping portion 65 is in the shape of a cantilever beam, the degree of freedom in the arrangement of the pressing portion (pressing portion 65b) that presses the bus bar base 11 is higher than that of a double cantilever beam-shaped vibration damping portion. Therefore, in the electrical connection box 1, by using the cantilever beam-shaped vibration damping portion 65, the bus bar base 11 can be clamped at a more appropriate position, so that the effect of suppressing abnormal noise caused by vibration of the bus bar 10 can be improved.

[0061] Furthermore, the electrical junction box 1 of the present embodiment can suppress vibration of the bus bar 10 ( 10A), and thus can also suppress wear of the contact points between the bus bar terminal connecting portion 12A and the relay terminal fittings 30 .

Claims

1. An electrical connection box, characterized in that: have: A bus bar having a flat bus bar base and a male tab-shaped bus bar terminal connection portion erected from the bus bar base; a relay component, wherein the relay component is provided with a relay terminal connecting portion; a relay terminal fitting that is physically and electrically connected to the bus bar terminal connecting portion and that is physically and electrically connected to the relay terminal connecting portion; and a frame body accommodating the bus bar, the relay component and the relay terminal fittings, The frame body includes: a case member having a bus bar storage chamber for storing the bus bar; and a cover member for covering the bus bar together with the case member. at least one of the bus bar and the frame is provided with at least one vibration damping portion, the vibration damping portion damping vibration accompanying the driving of the relay component that is transmitted to the bus bar base via the bus bar terminal connecting portion, The bus bar base is sandwiched between the case member and the cover member via the vibration damping portion.

2. The electrical connection box according to claim 1, characterized in that: The vibration damping portion is a spring-shaped portion provided on the bus bar base, and the bus bar base is sandwiched between the case member and the cover member by an elastic force generated between the spring-shaped portion and the cover member when the spring-shaped portion is pressed against the cover member.

3. The electrical connection box according to claim 1, characterized in that: The vibration damping portion is a spring-shaped portion provided on the cover member, and the bus bar base is sandwiched between the case member and the cover member by an elastic force generated between the spring-shaped portion and the bus bar base by pressing the bus bar base.

4. The electrical connection box according to claim 3, characterized in that: The spring-shaped portion is formed in a double cantilever beam shape in which a middle portion is pressed against the bus bar base.

5. The electrical connection box according to claim 3, characterized in that: The spring-shaped portion is formed in a cantilever beam shape in which a free end portion is pressed against the bus bar base.

6. The electrical connection box according to any one of claims 1 to 5, characterized in that: The bus bar terminal connection portion is physically and electrically connected to the relay terminal fitting by causing a spring force of the relay terminal fitting to act on a plane of the bus bar terminal connection portion.

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