Fuse unit and method for assembling the fuse unit

Abstract

To provide a fuse unit and an assembly method of a fuse unit, achieving miniaturization in a vertical direction.SOLUTION: There is provided a fuse unit 1 including a first unit 2 connected to a battery 100, a second unit 2C connected to a load, and a connecting part 9 connecting the first unit 2 and the second unit 2C. The first unit 2 includes a first housing 20 and has a first connection 31 connected to the battery 100 and a fused part 51. The second unit 2C includes a second housing 8, and has a second connection 71 connected to the load. The connecting part 9 is provided consecutively to both of the fused part 51 and the second connection 71 between both of them, while a metal plate is exposed to the outside. The connecting part 9 is provided to be bent such that the first unit 2 faces the second unit 2C.SELECTED DRAWING: Figure 10

Description

Technical Field

[0001] The present invention relates to a fuse unit and a method for assembling the fuse unit.

Background Art

[0002] Conventionally, there has been proposed a fuse block that is connected to a battery post to distribute power from the battery to each load and that cuts off the circuit when an overcurrent flows (see, for example, Patent Document 1).

[0003] The fuse block disclosed in Patent Document 1 includes a fuse element configured such that a plurality of circuit connection terminals made of a metal plate are connected to the tip of a bus bar made of a metal plate via a circuit protection body, a resin-made fuse housing that houses and holds this fuse element in an L shape, and a cover that is attachable to and detachable from the fuse housing.

[0004] The bus bar includes a battery connection plate portion that extends along the upper surface of the battery, and a plurality of protection body connection plate portions that extend from this battery connection plate portion and connect the battery connection plate portion and each circuit protection body. Each circuit protection body and each circuit connection terminal are provided along the side surface of the battery and are continuously provided in a direction (vertical direction) away from the upper surface of the battery.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] However, in the conventional fuse block, there are restrictions on the space in the direction (vertical direction) in which each circuit protection body (fusing portion) and each circuit connection terminal (second connection portion) are continuous, and miniaturization in the vertical direction has been demanded.

[0007] The present invention aims to provide a fuse unit and a fuse unit assembly method that are miniaturized in the vertical direction. [Means for solving the problem]

[0008] To solve the aforementioned problems and achieve the objective, the invention described in claim 1 is a fuse unit supported by a battery and supplying power from the battery to a load, comprising: a first unit connected to the battery; a second unit connected to the load; and a connecting portion connecting the first unit and the second unit, wherein the first unit comprises a first housing and has a first connection portion connected to the battery and a fuse portion that melts when an overcurrent flows; the second unit comprises a second housing and has a second connection portion connected to the load, the connecting portion is provided continuously between the fuse portion and the second connection portion and is configured with a metal plate exposed to the outside, and the connecting portion is provided bent so that the first unit and the second unit face each other. The first housing is provided with a first lock, and the second housing is provided with a second lock that engages with the first lock, and when the first unit and the second unit are facing each other, the first lock and the second lock engage with each other, and the first housing is provided with a cover supported by the first housing, there are a plurality of cutting portions, there are a plurality of connecting portions that are continuous with each of the plurality of cutting portions and spaced apart from each other, and the cover comprises a cover body that covers the plurality of cutting portions, and a plurality of insulating protective walls that extend from the cover body and enter between adjacent connecting portions to insulate adjacent connecting portions from each other. This fuse unit has the following characteristics. [Effects of the Invention]

[0009] According to the invention described in claim 1, miniaturization in the vertical direction can be achieved. [Brief explanation of the drawing]

[0010] [Figure 1] This is a perspective view showing a fuse unit according to one embodiment of the present invention, and is a perspective view showing the fuse unit attached to a battery. [Figure 2] This is a side view of Figure 1. [Figure 3] This is a view of Figure 1 from the rear. [Figure 4] This is a cross-sectional view along line II in Figure 3. [Figure 5]This is a perspective view showing the cover that constitutes the fuse unit. [Figure 6] This is a perspective view of the aforementioned cover from a different angle. [Figure 7] This is a diagram illustrating the assembly procedure for putting together the fuse unit, and is a perspective view showing the state of the connecting parts that make up the fuse unit before they are bent. [Figure 8] This is a perspective view showing the process after Figure 7. [Figure 9] This is a perspective view showing the subsequent process in Figure 8. [Figure 10] This is a perspective view showing the process after Figure 9. [Figure 11] This is a perspective view showing the subsequent process after Figure 10, and is a perspective view showing the fuse unit attached to the battery. [Modes for carrying out the invention]

[0011] Hereinafter, one embodiment of the present invention will be described with reference to Figures 1 to 11. Figure 1 is a perspective view showing a fuse unit 1 according to one embodiment of the present invention, and is a perspective view showing the fuse unit 1 attached to a battery 100. Figure 2 is a view of Figure 1 from the side (left-right direction Y). Figure 3 is a view of Figure 1 from the rear X2. Figure 4 is a cross-sectional view along line II in Figure 3. Figure 5 is a perspective view showing a cover 10 constituting the fuse unit 1. Figure 6 is a perspective view of the cover 10 from a different angle.

[0012] A fuse unit 1 according to one embodiment of the present invention, as shown in Figures 1 and 2, is directly attached to a battery 100 and supplies power from the battery 100 to various loads (not shown). As shown in Figure 1, the battery 100 comprises a box-shaped battery body 101 and a pair of battery posts 102 and 103 that protrude upward Z1 from the battery body 101. As also shown in Figure 2, the fuse unit 1 is attached to the battery 100 using battery terminals 104 and stud bolts 105.

[0013] As shown in FIGS. 1 to 4, the fuse unit 1 includes a unit body 2 as a first unit in the L-shaped claim, a unit lower part 2C as a second unit in the claim, a fourth bus bar 9 (shown in FIG. 4) as a connecting part in the claim for connecting the unit body 2 and the unit lower part 2C, and a cover 10. As shown in FIG. 4, in this fuse unit 1, the fourth bus bar 9 is bent in a U shape (bent 180 degrees), so that the vertical component part 2B (to be described later) of the unit body 2 and the unit lower part 2C are fixed to the battery 100 in an opposed state.

[0014] In this embodiment, the direction in which the battery posts 102 and 103 project is denoted as the vertical direction Z, the direction in which the pair of battery posts 102 and 103 are arranged is denoted as the left-right direction Y, and the direction orthogonal to the vertical direction Z and the left-right direction Y may be denoted as the front-back direction X. The side of the horizontal component part 2A as viewed from the vertical component part 2B of the unit body 2 may be denoted as "front (X1 direction)", and the opposite direction may be denoted as "rear (X2 direction)".

[0015] As shown in FIGS. 1 and 2, the unit body 2 includes a horizontal component part 2A along the upper surface of the battery body 101 and a vertical component part 2B along the side surface of the battery body 101, and is formed in an L shape. A first covering part 4 (to be described later) of the horizontal component part 2A and a second covering part 6 (to be described later) of the vertical component part 2B constitute the first housing 20.

[0016] As shown in FIGS. 1 and 7, the horizontal component part 2A includes a first bus bar 3 made of a conductive metal plate and a first covering part 4 covering the first bus bar 3.

[0017] As shown in FIGS. 1 and 7, the first bus bar 3 includes a first bus bar body (not shown) covered by a first covering main body 40 of a first covering part 4 (to be described later), a battery connection part 31 as a first connection part in the claim provided in front of X1 of the first bus bar body, and a power supply connection part 32 provided at the rear X2 and the end in the left-right direction Y of the battery connection part 31.

[0018] As shown in Figure 7, the battery connection portion 31 is composed of a part of the first busbar 3 and is formed in an annular shape with a first hole portion 3a. This battery connection portion 31 is configured to be exposed in the vertical direction Z by the first exposed portion 41 of the first covering portion 4, which will be described later.

[0019] As shown in Figure 7, the power connection section 32 is composed of a second contact section 33 formed in an annular shape and having a second hole 3b, which is made up of a part of the first busbar 3, and a connecting bolt 34 inserted into the second hole 3b of the second contact section 33. This power connection section 32 is configured to be exposed upward Z1 by the second exposed section 42 of the first covering section 4, which will be described later. The power connection section 32 is connected to the power supply wire harness 15, which will be described later, using a nut N with a washer.

[0020] As shown in Figures 1 and 3, the power supply wire harness 15 comprises a first wire 15A connected to a power supply unit (not shown), a first terminal unit 15B electrically and mechanically connected to the end of the first wire 15A by crimping, and an L-shaped terminal 15C that is continuous with the first terminal unit 15B and connected to the power connection unit 32.

[0021] As shown in Figure 7, the first covering portion 4 includes a first covering body 40 that covers the first busbar body of the first busbar 3, a first exposed portion 41 provided at the front X1 of the first covering body 40 to expose the battery connection portion 31, and a second exposed portion 42 provided at the rear X2 and left-right Y end of the first exposed portion 41 to expose the power connection portion 32.

[0022] As shown in Figures 3 and 4, the vertical component 2B includes a second busbar 5 (shown in Figure 4) that is continuous with the first busbar 3 of the horizontal component 2A, and a second covering portion 6 that is continuous with the first covering portion 4 of the horizontal component 2A and covers the second busbar 5.

[0023] As shown in Figures 4 and 7, the second busbar 5 comprises a second busbar body (not shown) that is continuous with the first busbar body of the first busbar 3, and four (or more) fuses 51 as fuse-cutting parts in the claim that melt and interrupt the circuit when an overcurrent flows. As shown in Figure 7, the four fuses 51 are arranged in the left-right direction Y at the lower Z2 end of the second busbar 5.

[0024] As shown in Figure 7, each fuse 51 comprises a pair of plate-shaped portions 52 and 53, a narrow portion 54 located between the pair of plate-shaped portions 52 and 53 and narrower than each plate-shaped portion 52 and 53, and a fuse element 55, and is configured to melt and interrupt the circuit when an overcurrent flows. As shown in Figures 4 and 7, each fuse 51 is housed in each fuse housing portion 61 of the second covering portion 6, which will be described later.

[0025] As shown in Figures 4 and 7, the second covering portion 6 comprises a flat plate-shaped second covering body 60 (shown in Figure 7) that covers the second busbar body of the second busbar 5, four fuse housing portions 61 provided below Z2 of the second covering body 60 for housing each fuse 51, and a locking projection 62 (shown in Figure 7) which serves as the first lock in the claim and engages with the lower part 2C of the unit described later.

[0026] As shown in Figures 4 and 7, each fuse housing 61 has a circumferential surface 6A that surrounds all four sides of each fuse 51 in the vertical Z direction and the left-right Y direction, and is configured to have an opening in the front-rear direction X so that both sides of each fuse 51 in the front-rear direction X are exposed. Hereinafter, as shown in Figure 4, the opening at the front X1 of each fuse housing 61 may be referred to as opening 6F, and the opening at the rear X2 may be referred to as opening 6B.

[0027] Furthermore, the second covering portion 6 is provided with a locking receiving portion (not shown) that is locked to a locking portion 12 of the cover 10, which will be described later. When the locking portion 12 of the cover 10, which will be described later, is locked to the locking receiving portion, the cover 10, which will be described later, covers the rear opening 6B X2 of the four fuse housings 61 all at once.

[0028] As shown in Figure 7, the locking projection 62 is provided protruding from the left-right Y side of the second covering body 60 and is configured to engage with the locking portion 82 of the lower unit 2C, which will be described later. The engagement of the locking portion 82 and the locking projection 62 maintains the opposing state between the lower unit 2C and the vertical component 2B of the unit body 2.

[0029] As shown in Figure 4, the lower part 2C of the unit includes a third busbar 7 connected to the second busbar 5 via a fourth busbar 9, which will be described later, and a third covering portion 8 which serves as the second housing in the claim and covers the third busbar 7.

[0030] As shown in Figures 4 and 8, the third busbar 7 comprises four (or more) continuous busbars 70 (shown in Figure 4) that are continuous with each of the fourth busbars 9 described later, and four (or more) wire connection parts 71 (shown in Figure 8) that serve as the second connection part in the claim, which are connected to each load (not shown) using an external circuit wire harness 16 described later.

[0031] Each continuous busbar 70 is arranged in a line spaced apart from each other in the left-right direction Y. Each wire connection part 71 is provided in a line with respect to each continuous busbar 70. That is, as shown in Figure 8, each wire connection part 71 is arranged in a line spaced apart from each other in the left-right direction Y. Each wire connection part 71 is also provided to each fuse 51 of the second busbar 5 via each fourth busbar 9 and each continuous busbar 70, which will be described later.

[0032] Each wire connection portion 71, as shown in Figure 8, is configured to include an annular third contact portion (not shown) having a third hole (not shown), and a connecting bolt 73 inserted into the third hole of the third contact portion. Each wire connection portion 71 is configured to be exposed by a third exposed portion (not shown) of the third covering portion 8, which will be described later. Each wire connection portion 71 is connected to an external circuit wire harness 16, which will be described later, using a nut N with a washer.

[0033] As shown in Figure 8, the external circuit wire harness 16 comprises a second wire 16A connected to each load (not shown), a second terminal portion 16B electrically and mechanically connected to the end of the second wire 16A by crimping, and a round terminal 16C that is continuous with the second terminal portion 16B and connected to the wire connection portion 71.

[0034] As shown in Figures 4, 7, and 8, the third covering portion 8 comprises a flat plate-shaped third covering body 80 that covers the four continuous busbars 70 (shown in Figure 4) of the third busbar 7, an arch-shaped peripheral wall portion 81 (shown in Figure 8) provided on the third covering body 80 that surrounds the periphery of each wire connection portion 71, a third exposed portion (not shown) provided inside the peripheral wall portion 81 that exposes each wire connection portion 71, and a locking portion 82 (shown in Figures 7 and 8) which acts as a second lock in the claim and engages with a locking projection 62 provided on the vertical component portion 2B of the unit body 2.

[0035] As shown in Figure 7, the third covering body 80 is formed in a rectangular shape in plan view and is approximately the same size as the front surface X1 of the second covering portion 6. That is, the third covering body 80 is configured such that, when facing each other, it can collectively cover the front opening 6F of each fuse housing portion 61.

[0036] As shown in Figure 8, each peripheral wall portion 81 is provided projecting forward X1 when facing another, and comprises an arc-shaped surface 8A and inner surfaces 8B, 8B that are continuous with the arc-shaped surface 8A and face each other in the left-right direction Y, and is configured to open forward X1 and downward Z2 when facing another.

[0037] As shown in Figure 8, the locking portion 82 is provided projecting in a U-shape from the left-right Y-side of the third covering body 80 toward the vertical component 2B of the unit body 2. Each locking portion 82 is configured to engage with the locking projection 62 of the vertical component 2B by positioning the locking projection 62 of the vertical component 2B inside the locking portion 82. Furthermore, the engagement between the locking portion 82 and the locking projection 62 maintains a facing state between the vertical component 2B of the unit body 2 and the lower part 2C of the unit.

[0038] As shown in Figure 7, the fourth busbar 9 is provided in a plate shape and is arranged in a row spaced apart from each other in the left-right direction Y. Furthermore, as shown in Figure 4, each fourth busbar 9 is provided continuously between each fuse 51 and each continuous busbar 70. Note that in Figure 4, the hatching showing the cross-section of the fuse housing 61 and the third covering body 80 of the third covering part 8 is omitted.

[0039] As shown in Figure 4, each fourth busbar 9 comprises a first continuous section 9A connected to each fuse 51, a second continuous section 9B connected to the first continuous section 9A, and a third continuous section 9C connected to the second continuous section 9B and each continuous busbar 70 of the third busbar 7, and is configured to bend in a U-shape. Also, as shown in Figure 7, each fourth busbar 9 is positioned between the second covering section 6 and the third covering section 8 and is configured to be exposed to the outside. Furthermore, as shown in Figure 10, insulating protective walls 13 of the cover 10, which will be described later, are positioned on both sides of each fourth busbar 9 in the left-right direction Y, so that adjacent fourth busbars 9 are insulated from each other.

[0040] The cover 10 is made of, for example, an insulating resin. As shown in Figures 5 and 6, the cover 10 comprises a rectangular plate-shaped cover body 11, a pair of locking parts 12, 12 provided on the cover body 11 that lock into the locking receiving parts of the vertical component 2B, five (or more) insulating protective walls 13 protruding from the cover body 11, and reinforcing ribs 14 that reinforce the insulating protective walls 13.

[0041] As shown in Figures 5 and 6, the cover body 11 comprises a rectangular plate-shaped fuse cover 11A that covers four fuse housings 61 together, and a rectangular plate-shaped busbar cover 11B that extends downward Z2 from the fuse cover 11A and covers four fourth busbars 9 together.

[0042] The fuse cover 11A is made of a transparent resin that allows each fuse 51 to be seen through, so that the status of each fuse 51 can be visually checked.

[0043] As shown in Figures 5 and 6, the pair of locking portions 12, 12 are provided at both ends of the fuse cover 11A in the left-right direction Y. Each locking portion 12 is formed in a U shape and is configured to lock onto the locking receiving portion of the second covering portion 6 by positioning the locking receiving portion inside it.

[0044] Each insulating protective wall 13 is formed in a plate shape, as shown in Figures 5 and 6, and is configured to face each other in the left-right direction Y. Of the five insulating protective walls 13, two insulating protective walls 13 (labeled 13A in Figures 5 and 6) protrude from both ends of the busbar cover 11B in the left-right direction Y and are positioned at both ends of the four fourth busbars 9, while three insulating protective walls 13 (labeled 13B in Figure 6) are configured to enter between each adjacent fourth busbar 9.

[0045] As shown in Figure 6, the reinforcing rib 14 is provided as a plate-like extension from the lower end of the busbar cover 11B toward the front X1, and is also provided continuously between adjacent insulating protective walls 13 to reinforce each insulating protective wall 13.

[0046] Next, the assembly procedure for fuse unit 1 will be explained with reference to Figures 7 to 11. Note that in Figures 10 and 11, parts other than the terminals of the wires 15A and 16A that make up the power supply wire harness 15 and the external circuit wire harness 16 are omitted.

[0047] First, a single metal sheet is pressed and bent to form a punched body that includes a first busbar 3, a second busbar 5, a third busbar 7, and a fourth busbar 9 that are continuous with each other. After this, a connecting bolt 34 is attached to the power connection part 32, and connecting bolts 73 are attached to each wire connection part 71. In this state, insert molding is used to form a molded fuse unit 1 (shown in Figure 7) in which the punched body and each covering part 4, 6, and 8 are integrally formed.

[0048] As shown in Figure 7, in the molded fuse unit 1, each fourth busbar 9 is located between the vertical component 2B of the unit body 2 and the lower part 2C of the unit, and is exposed to the outside. Also, as shown in Figure 7, in the molded fuse unit 1, the vertical component 2B of the unit body 2 and the lower part 2C of the unit are aligned in the vertical direction Z (each fourth busbar 9 is not bent).

[0049] Next, the fourth busbar 9 of the molded fuse unit 1 is bent into a U-shape (bent 180 degrees) so that the vertical component 2B of the unit body 2 and the lower unit 2C face each other (bending process). As a result, the locking portion 82 of the lower unit 2C is brought closer to the locking projection 62 of the vertical component 2B, and the locking portion 82 and the locking projection 62 engage (engaging process). This covers the front opening 6F of each fuse housing 61 by the lower unit 2C all at once, and maintains the facing state between the vertical component 2B of the unit body 2 and the lower unit 2C. As a result, the opening 6F of the front opening 6F of each fuse housing 61 is covered all at once by the lower unit 2C, which reduces the number of parts required to cover the opening 6B of each fuse housing 61.

[0050] Next, as shown in Figures 8 and 9, the L-shaped terminal 15C at the end of the power supply wire harness 15 is brought close to the power connection section 32, the bolt shaft portion 34 of the connecting bolt 34 (which is given the same reference numeral as the connecting bolt) is inserted through it, and the nut N is screwed onto the bolt shaft portion 34. This connects the power supply wire harness 15 to the power connection section 32 both electrically and mechanically.

[0051] Furthermore, as shown in Figures 8 and 9, the round terminal 16C at the end of the external circuit wire harness 16 is brought close to each wire connection part 71, the bolt shaft portion 73 of the connecting bolt 73 (which is given the same reference numeral as the connecting bolt) is inserted through it, and the nut N is screwed onto the bolt shaft portion 73. This process is repeated four times. As a result, the external circuit wire harness 16 is electrically and mechanically connected to each wire connection part 71.

[0052] Furthermore, as shown in Figure 8, the cover body 11 of the cover 10 is brought close to the vertical component 2B. The locking portion 12 of the cover 10 approaches the locking receiving portion of the vertical component 2B and locks into place. The cover body 11 covers the rear X2 opening 6B of each fuse housing 61 all at once, and of the insulating protective walls 13A and 13B of the cover 10, two (indicated by reference numeral 13A) are positioned at both ends of the four fourth busbars 9, and three (indicated by reference numeral 13B) enter between adjacent fourth busbars 9. In this way, the cover 10 is assembled to the vertical component 2B.

[0053] In this configuration, the front opening X1 6F of each fuse housing 61 is covered by the third covering body 80, and the rear opening X2 6B of each fuse housing 61 is covered by the fuse cover 11A of the cover body 11. This prevents foreign matter from entering the interior of each fuse housing 61 by covering the front opening X1 6F and the rear opening X2 6B of each fuse housing 61. Furthermore, even if the fuse elements 55 constituting each fuse 51 are scattered, it is possible to prevent them from scattering outside the fuse housing 61.

[0054] Finally, when connecting the battery connection part 31 to the battery 100, as shown in Figures 9 and 10, with the stud bolt 105 connected to one end of the battery terminal 104, the stud bolt 105 is inserted through the first hole 3a (shown in Figure 9) of the battery connection part 31, and a nut N with a washer is screwed onto the stud bolt 105 to attach the battery terminal 104 to the battery connection part 31. After this, as shown in Figure 11, the battery terminal 104 is attached to the battery post 103, thereby electrically connecting the battery connection part 31 to the battery post 103, i.e., the battery 100, via the battery terminal 104 and the stud bolt 105. In this way, the opposing fuse unit 1 is assembled (directly attached) to the battery 100. This completes the assembly of the fuse unit 1.

[0055] According to the embodiment described above, the fourth busbar 9 (connecting part) is provided continuously between the fuse 51 (fussing part) and the wire connection part 71 (second connection part), and is configured with a metal plate exposed to the outside. The fourth busbar 9 is bent so that the unit body 2 (first unit) and the lower part of the unit 2C (second unit) face each other. That is, because the fourth busbar 9 is configured with a metal plate exposed to the outside, the fourth busbar 9 can be bent to realize a configuration in which the unit body 2 and the lower part of the unit 2C face each other. This makes it possible to reduce the size of the fuse unit 1 in the vertical direction Z. As a result, space can be secured below the fuse unit 1 Z2.

[0056] Furthermore, the first housing 20 is provided with a locking projection 62 (first lock), and the third covering portion 8 (second housing) is provided with a locking portion 82 (second lock) that engages with the locking projection 62. When the unit body 2 (first unit) and the lower unit 2C (second unit) are facing each other, the locking projection 62 and the locking portion 82 are engaged with each other. As a result, the unit body 2 and the lower unit 2C can maintain their facing positions because the locking projection 62 and the locking portion 82 are engaged with each other.

[0057] Furthermore, the device includes a cover 10 that is assembled to the first housing 20, multiple fuses 51 (fussing parts) are provided, and multiple fourth busbars 9 (connecting parts) are provided that are continuous with each of the multiple fuses 51 and spaced apart from one another. The cover 10 comprises a cover body 11 that covers the multiple fuses 51, and multiple insulating protective walls 13 that extend from the cover body 11 and enter between adjacent fourth busbars 9 to insulate adjacent fourth busbars 9 from one another. With this configuration, when the cover 10 is assembled to the first housing 20, the multiple fuses 51 are covered by the cover body 11, and adjacent fourth busbars 9 are insulated from each other by the insulating protective walls 13. In other words, the presence of the cover 10 makes it possible to realize a configuration in which adjacent fourth busbars 9 are insulated from each other.

[0058] Furthermore, with the unit body 2 (first unit) and the lower unit 2C (second unit) facing each other, the fuse 51 (fussing part) is located on the opposite side (rear X2) from the battery 100, with the wire connection part 71 (second connection part) in between. This allows the status of the fuse 51 to be checked when the fuse unit 1 is assembled to the battery 100.

[0059] Furthermore, in the embodiment described above, the fuse unit assembly method includes a bending step of bending the unit body 2 (first unit) and the lower unit 2C (second unit) at the fourth busbar 9 (connecting part) to bring the vertical component 2B of the unit body 2 and the lower unit 2C to face each other, and an engagement step of engaging the lock projection 62 (first lock) and the lock part 82 (second lock) with each other. This makes it possible to reduce the size of the fuse unit 1 in the vertical direction Z.

[0060] Furthermore, while the best configurations and methods for carrying out the present invention are disclosed in the above description, the present invention is not limited thereto. That is, although the present invention is particularly illustrated and described with respect to specific embodiments, those skilled in the art can make various modifications to the embodiments described above in terms of shape, material, quantity, and other detailed configurations without departing from the scope of the technical idea and objectives of the present invention. Therefore, the limiting descriptions of shape, material, etc. disclosed above are provided as examples to facilitate understanding of the present invention and do not limit the present invention. Accordingly, descriptions of components with some or all of these limitations removed are included in the present invention. [Explanation of Symbols]

[0061] 1 Fuse Unit 2. Main Unit (Unit 1) Lower part of unit 2C (second unit) 20 1st Housing 8. Third covering section (second housing) 9. Fourth busbar (connecting section) 10 Covers 11 Cover body 13 Insulating protective wall 31 Battery connection section (first connection section) 51 Fuse (blunt part) 62 Locking projection (first lock) 71 Wire connection section (second connection section) 82. Lock Section (Second Lock) 100 batteries

Claims

1. A fuse unit supported by a battery and supplying power from the battery to a load, The system comprises a first unit connected to the battery, a second unit connected to the load, and a connecting portion connecting the first unit and the second unit. The first unit comprises a first housing and has a first connection part connected to the battery and a melting part that melts when an overcurrent flows, The second unit comprises a second housing and has a second connection portion connected to the load, The connecting portion is provided continuously between the cutting portion and the second connecting portion, and is constructed with a metal plate exposed to the outside, and the connecting portion is bent so that the first unit and the second unit face each other. The first housing is provided with a first lock, The second housing is provided with a second lock that engages with the first lock. With the first unit and the second unit facing each other, the first lock and the second lock engage with each other. The first housing is equipped with a cover that is supported by the first housing, Multiple cutting sections are provided, The connecting portion is continuous with each of the plurality of cutting portions and is provided in multiple locations spaced apart from each other. The fuse unit is characterized by comprising a cover body that covers the plurality of fuse portions, and a plurality of insulating protective walls that extend from the cover body, enter between adjacent connecting portions, and insulate adjacent connecting portions from each other.

2. With the first unit and the second unit facing each other, The fuse unit according to claim 1, characterized in that the fuse cutting portion is provided on the side opposite to the battery, with the second connection portion in between.

3. A method for assembling a fuse unit using the fuse unit described in claim 1, A bending step in which the first unit and the second unit are bent at the connecting portion so that the first unit and the second unit face each other, A method for assembling a fuse unit, characterized by including an engagement step of engaging the first lock and the second lock with each other.

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