Bus bar module housing and bus bar module

Abstract

The purpose of the present invention is to provide a bus bar module case and a bus bar module capable of suitably implementing a cover structure. A bus bar module case (100) is provided with: a case main body (50) having a plurality of bus bar cavities (20) each housing therein a bus bar (2) connected to an electrode (211n) of a battery cell (211) among a plurality of battery cells (211) arranged side by side, and wiring lines (30) connected to the electrodes (211n) of the battery cells (211); the wiring line (30) is provided with a wiring material (3) which includes a main line (3a) and a plurality of branch parts (3b) and is electrically connected to the bus bar (2). A cover (40) having a trunk line protection part (41) for protecting the trunk line (3a) and a plurality of branch protection parts (42) for protecting the branch parts (3b); a hinge part (60) that connects the cover (40) and the case main body (50) via the branch protection part (42); and a lock part (10) that locks the cover (40) to the housing main body (50).

Description

Technical Field

[0001] This invention relates to a busbar module housing and a busbar module. Background Technology

[0002] As a technology related to conventional busbar module housings and busbar modules, for example, Patent Document 1 discloses a busbar module that is mounted on the side of a battery assembly to form a power supply device. The busbar module has a housing comprising: a plurality of busbar receiving portions; voltage detection terminals disposed adjacent to each busbar receiving portion; a wiring portion for laying voltage detection lines connected to the voltage detection terminals; a cover covering a predetermined area of ​​the wiring portion; a hinge portion for moving the cover to a closed position covering the opening of the wiring portion and an open position exposing the opening of the wiring portion; and a locking portion for locking the cover in the closed position.

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent Application Publication No. 2014-93218 Summary of the Invention

[0006] The technical problem that the invention aims to solve

[0007] Incidentally, in such busbar module housings and busbar modules, for example, the cover is opened and closed by a hinge and locked by a locking part, but there is room for further improvement in the construction of the configuration including the hinge and the locking part.

[0008] The present invention was made in view of the above circumstances, and its object is to provide a busbar module housing and a busbar module that can appropriately realize the structure of the cover.

[0009] Technical means for solving problems

[0010] To achieve the above objectives, the busbar module housing of the present invention comprises: a housing body having a plurality of busbar cavities and wiring, wherein each of the plurality of busbar cavities internally houses a busbar, the busbar being connected to the electrodes of a plurality of battery cells arranged side by side, and the wiring being provided with wiring material including a trunk line and a plurality of branch lines and electrically connected to the busbar; a cover having a trunk line protection portion for protecting the trunk line and a plurality of branch line protection portions for protecting the branch lines; a hinge portion connecting the cover to the housing body via the branch line protection portions; and a locking portion locking the cover to the housing body.

[0011] To achieve the above objectives, the busbar module of the present invention comprises: a busbar connected to the electrodes of a plurality of battery cells arranged side-by-side; wiring material including a trunk line and a plurality of branches, and electrically connected to the busbar; and a busbar module housing having: a housing body having a plurality of busbar cavities for receiving the busbar and wiring lines provided with the wiring material; a cover having a trunk line protection portion for protecting the trunk line and a plurality of branch line protection portions for protecting the branches; a hinge portion connecting the cover to the housing body via the branch line protection portions; and a locking portion locking the cover to the housing body.

[0012] Invention Effects

[0013] The busbar module housing and busbar module of the present invention have the effect of appropriately realizing the structure of a cover. Attached Figure Description

[0014] Figure 1 This is a perspective view showing the busbar module of the embodiment with its cover open.

[0015] Figure 2 yes Figure 1 An enlarged front view of part P1.

[0016] Figure 3 From Figure 1 A magnified stereoscopic view observed from the P2 direction.

[0017] Figure 4 This is a perspective view showing the busbar module of the embodiment with its cover closed.

[0018] Figure 5 yes Figure 4 VV sectional view.

[0019] Figure 6 This is a perspective view showing the busbar module of a modified embodiment with its cover open.

[0020] Figure 7 This is a perspective view showing the busbar module of a modified embodiment in a closed state.

[0021] Explanation of reference numerals in the attached figures

[0022] 1: Busbar Module

[0023] 2: Busbar

[0024] 3: Wiring materials

[0025] 3a: Main line

[0026] 3b: Branch Office

[0027] 10: Locking section

[0028] 11: Side locking part of the cover

[0029] 12: Locking part on the side of the main body of the housing

[0030] 20: Busbar cavity

[0031] 30: Wiring

[0032] 40: Cover

[0033] 41: Mainline Protection Department

[0034] 42: Branch Protection Section

[0035] 50: Main body of the shell

[0036] 60: Hinge section

[0037] 100: Busbar module housing

[0038] 211: Battery cell

[0039] 211n: Electrode Detailed Implementation

[0040] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to these embodiments. Furthermore, the constituent elements in the following embodiments include elements that can and are easily substituted by those skilled in the art, or substantially the same elements.

[0041] [Example]

[0042] like Figure 1 and Figure 2 As shown, the battery module 210 of this embodiment includes multiple battery cells 211 and a busbar module 1. The battery module 210 of this embodiment is a constituent element of the battery pack 200. The battery pack 200 may also have multiple battery modules 210. The battery pack 200 is used as a power source in vehicles such as electric vehicles and hybrid electric vehicles.

[0043] Furthermore, in the following description, the direction in which the multiple battery cells 211 are arranged side by side is designated as the first direction X, and the two directions orthogonal to the first direction X are designated as the second direction Y and the third direction Z. The third direction Z is the direction perpendicular to the mounting surface 211b of the multiple battery cells 211. In addition, below, one side of the first direction X will be referred to as side X1, and the other side will be referred to as side X2. Similarly, the second direction Y will be referred to as side Y1 and side Y2, and the third direction Z will be referred to as side Z1 and side Z2. Furthermore, in the following description, the third direction Z will sometimes be referred to as the vertical direction, side Z1 as the upper side, and side Z2 as the lower side.

[0044] The battery cells 211 constitute a so-called single cell, and a battery pack is formed by arranging multiple battery cells 211 along the first direction X. The surfaces (not shown) of the multiple battery cells 211 constituting the battery pack on one side Y1 and the other side Y2 in the second direction Y are electrode arrangement surfaces 211a (the electrode arrangement surface 211a on the other side Y2 is not shown) for arranging the electrodes 211n of each battery cell 211. The electrode arrangement surfaces 211a are parallel to the surface containing the first direction X and the third direction Z. In each battery cell 211, a positive electrode is arranged on one of the two electrode arrangement surfaces 211a, and a negative electrode is arranged on the other electrode arrangement surface 211a. Busbar modules 1 are respectively provided on the two electrode arrangement surfaces 211a. Furthermore, the busbar modules 1 are formed into a strip shape along the first direction X, but... Figure 1 and Figure 4 In the diagram, only a portion of busbar module 1 is shown.

[0045] A plate member 212, formed in the shape of a plate, is provided at the end of the battery module 210 (multiple battery cells 211). In this embodiment, the plate member 212 is a member referred to as an end plate, and is molded, for example, from synthetic resin. The plate member 212 is disposed at both ends relative to the multiple battery cells 211 to clamp and hold the multiple battery cells 211 arranged side-by-side. Figure 1 The diagram shows a plate member 212 disposed at the end on the other side X2 in the first direction X, but does not show a plate member 212 disposed at the end on one side X1. Figure 4 , Figure 6 , Figure 7 Similarly), the plate component 212 has a busbar module configuration surface 212a along the third third direction Z on one side Y1 and the other side Y2 in the second direction Y. The end of the busbar module 1 is configured on the busbar module configuration surface 212a. The busbar module configuration surface 212a is parallel to the electrode configuration surface 211a of the battery cell 211 in the first direction X.

[0046] like Figure 2As shown, the busbar module 1 includes a busbar module housing 100, a busbar 2, and wiring material 3. The busbar 2 and wiring material 3 are only used in... Figure 2 As shown. The busbar module housing 100 is integrally formed of insulating resin material. The busbar module housing 100 includes a housing body 50, a cover 40, a hinge portion 60, and a locking portion 10. The cover 40 is configured to be openable and closable relative to the housing body 50. The housing body 50 has a housing body-side locking portion 12 of the locking portion 10, a busbar cavity 20 that houses the busbar 2, and wiring lines 30 on which wiring material 3 is disposed. The busbar cavity 20 and the wiring lines 30 are integrally formed to constitute the housing body 50. The wiring lines 30 include trunk wiring lines 35 of the trunk line 3a on which wiring material 3 is disposed and branch wiring lines 36 of the branch portion 3b on which wiring material 3 is disposed. The busbar module housing 100 will be described in detail later.

[0047] The busbar 2 is connected to the electrodes 211n of a plurality of battery cells 211 arranged side-by-side along the first direction X. The busbar 2 is a conductor formed from a conductive metal plate. The busbar 2 is formed in a generally elongated rectangular shape with the first direction X as its long side, so as to connect to each electrode 211n of the adjacent battery cells 211. Furthermore, in this embodiment, at the end of the battery module 210, the busbar 2 is connected to one electrode 211n of the battery cell 211 at the end. The busbar 2 has an electrode connection hole 2a as a through circular hole. The busbar 2 is fixed to the electrode 211n via the electrode connection hole 2a. The busbar 2 connects two adjacent battery cells 211 in series, for example. In this case, the busbar 2 connects the positive terminal of one battery cell 211 to the negative terminal of another battery cell 211. The busbar 2 is sometimes also configured to connect two adjacent battery cells 211 in parallel. In addition, the busbar 2 is shown as a generally flat plate in this embodiment, but it may also have a protrusion that mimics the shape of the beam portion 22 described later, so as not to interfere with the beam portion 22.

[0048] The wiring material 3 is, for example, a flat wiring material such as a flexible printed circuit board. When the wiring material 3 is a flexible printed circuit board, it has a base film, a capping layer, and a conductive layer. The base film and the capping layer are flexible, insulating resin layers. The conductive layer is protected by being sandwiched between the base film and the capping layer. The conductive layer is, for example, a conductive metal foil, having multiple circuit patterns connected to the busbar 2. The wiring material 3 is electrically connected to the busbar 2 and has a trunk line 3a arranged along a first direction X and a branch 3b extending from the trunk line 3a to a third direction Z side Z1.

[0049] Additionally, the busbar module 1 may be provided with a voltage detection terminal (not shown). The voltage detection terminal is electrically connected to the busbar 2 and the branch 3b of the wiring material 3. The voltage detection terminal detects the voltage between the electrodes of the busbar 2, and monitors the voltage of the battery cell 211 by means of a monitoring device (not shown) connected to the wiring material 3.

[0050] The busbar cavity 20 in the housing body 50 of the busbar module housing 100 has a sidewall 21. The sidewall 21 is formed into a generally frame-like shape with openings on one side Y1 and the other side Y2 in the second direction Y, and is erected around the end edge 2b that forms the outer periphery of the busbar 2. The generally plate-like component of the sidewall 21 is erected generally perpendicular to the electrode arrangement surface 211a, and is formed in a generally elongated rectangular shape with the first direction X as the long side, so as to surround the busbar 2.

[0051] The sidewall 21 of one side X1 in the first direction X is divided into one side Z1 and another side Z2 in the third direction Z, and separated in the first direction X. The separated portion of the sidewall 21 of one side X1 in the first direction X is set as a branch line 36 for the wiring material 3 branch 3b to be laid. In addition, a beam portion 22 is provided from the sidewall 21 of one side Z1 in the third direction Z to the sidewall 21 of the other side Z2 in the approximately central portion of the first direction X inside the busbar cavity 20. Although not shown, the cross section of the beam portion 22 parallel to the plane including the first direction X and the second direction Y is formed in a generally U-shape. The beam portion 22 is arranged such that the generally U-shaped opening side faces the other side Y2 of the second direction Y. In addition, a plurality of busbar locking portions 29 are provided on the sidewall 21. Each busbar locking portion 29 is formed into a leaf spring shape by forming slits on both sides. The busbar 2 housed in the busbar cavity 20 can be fixed by the busbar locking part 29.

[0052] like Figure 2 and Figure 5As shown, the trunk wiring 35 of the wiring 30 in the busbar module housing 100 is located on the other side Z2 of the busbar cavity 20 in the third direction Z. Furthermore, when the busbar module 1 is installed with multiple battery cells 211 (hereinafter sometimes simply referred to as the "installation state"), the other side Z2 in the third direction Z becomes the lower side of the busbar cavity 20 in the vertical direction. The wiring 30 includes a main board 31 and a base plate 32. The main board 31 and the base plate 32 extend in the first direction X. The main board 31 is connected to the side wall 21, i.e., the lower side wall 21a, of the other side Z2 in the third direction Z in the busbar cavity 20, with its surface facing the second direction Y. The base plate 32 is connected to the end of the main board 31 on the other side Z2 in the third direction Z, and is formed to protrude towards the side Y1 in the second direction Y, with its surface facing the third direction Z. The trunk wiring 35 is formed by the Z2 side of the lower sidewall 21a in the third direction Z, the Y1 side of the main board 31 in the second direction Y, and the Z1 side of the base plate 32 in the third direction Z. The trunk line 3a of the wiring material 3 is laid on the trunk wiring 35. The trunk wiring 35 is relatively long in the first direction X.

[0053] A housing body side locking part 12 is provided on the surface of the base plate 32 of the wiring 30 on the other side Z2 of the third direction Z, for locking the cover side locking part 11 described later. Multiple housing body side locking parts 12 are provided at predetermined intervals along the first direction X. The housing body side locking parts 12 are formed in a generally rectangular cylindrical shape.

[0054] The cover 40 is generally plate-shaped and, when the cover 40 is open, is located on one side Z1 (i.e., the upper side of the housing body 50) in the third direction Z. The cover 40 has a trunk line protection portion 41 and multiple branch line protection portions 42. In this embodiment, one trunk line protection portion 41 and three branch line protection portions 42 of the cover 40 are formed as a single unit. Figure 1 The diagram shows two sets of covers 40. That is, the covers 40 can be divided and set according to a predetermined number of branch protection parts 42, and multiple covers 40 can be set for a single housing body 50.

[0055] The main line protection section 41 of the cover 40 is formed along the first direction X. Three branch protection sections 42 are formed from the main line protection section 41 along the third direction Z. Figure 1 With the cover 40 open, the branch protection section 42 is formed facing the other side Z2 in the third direction Z. The end portion of the branch protection section 42 protrudes to the other side X2 in the first direction X and is formed to be wider. In addition, the end edge 41b of the branch protection section 42 and the end edges 42a and 42b of the branch protection section 42 are provided in the two end edges 41a and 41b of the trunk protection section 41, and ribs 43 are provided along each end edge 41b, 42a and 42b.

[0056] The hinge portion 60 connects the cover 40 to the housing body 50 via the branch protection portion 42. Specifically, the hinge portion 60 is located at the end of the branch protection portion 42 of the cover 40 and is connected to the upper sidewall 21, i.e., the upper sidewall 21b, of the manifold cavity 20 of the housing body 50 (see...). Figure 2 In other words, the hinge portion 60 is located vertically upward when the busbar module 1 (busbar module housing 100) is installed. The hinge portion 60 is formed as a thin plate and is flexible.

[0057] A cover-side locking portion 11 is provided at the end edge 41a of the main line protection portion 41. The cover-side locking portions 11 are provided at predetermined intervals along the main line protection portion 41 (first direction X). In a set of covers 40 having three branch protection portions 42, two cover-side locking portions 11 are provided. The cover-side locking portions 11 engage with housing body-side locking portions 12 provided on the wiring 30 of the housing body 50. The cover-side locking portions 11 and the housing body-side locking portions 12 constitute a locking portion 10. Figure 3 As shown, the cover-side locking portion 11 is provided with a base plate 11a protruding toward the second direction Y side Y1 when the cover 40 is open, and a protrusion 11b protruding from the third side of the base plate 11a toward the Z side Z1. The protrusion 11b is formed in a generally mountain shape with an inclined surface 11b1. In the protrusion 11b, a jaw portion 11b2 is formed on the side opposite to the inclined surface 11b1 in the second direction Y. The jaw portion 11b2 is formed perpendicular to the surface of the base plate 11a.

[0058] In busbar module 1 (busbar module housing 100), when cover 40 is closed, as follows: Figure 4 As shown, the cabling 30 is covered by a cover 40. The trunk protection section 41 of the cover 40 covers the trunk cabling 35, protecting the trunk 3a of the cabling material 3, and the branch protection section 42 covers the branch cabling 36, protecting the branch section 3b. Figure 5As shown, when the cover 40 is in the closed state, the cover-side locking portion 11 of the locking portion 10 is inserted into and locked to the housing body-side locking portion 12 of the locking portion 10. Specifically, the cover-side locking portion 11 is inserted into the through hole 12a of the housing body-side locking portion 12 from the inclined surface 11b1 side, i.e., the end side, of the protrusion 11b of the cover-side locking portion 11. The through hole 12a (especially the lower plate portion 12b on the other side Z2 of the third direction Z of the housing body-side locking portion 12) is pushed open by the inclined surface 11b1, and the jaw portion 11b2 of the protrusion 11b is locked to the end of the housing body-side locking portion 12 on the other side Y2 of the second direction Y. In other words, when the locking portion 10 is locked, the protrusion 11b of the cover-side locking portion 11 faces downward, thus pushing open the lower plate portion 12b of the housing body-side locking portion 12, which has a lower rigidity than the bottom plate 32, and locking it to the housing body-side locking portion 12. That is, the protrusion 11b of the cover-side locking portion 11 protrudes outward toward the outside of the manifold cavity 20, and forms a hole-like portion of the housing body-side locking portion 12 that can deform in accordance with the protrusion direction of the protrusion 11b, thereby enabling the locking portion 10 to be formed with a simple structure.

[0059] [Variation Example]

[0060] Figure 6 and Figure 7 A variation of this embodiment is shown. In this variation, the position of the locking part 10 is changed; a cover-side locking part 11 is provided on the branch protection part 42, and a housing body-side locking part 12 is provided on the side of the branch wiring line 36. More specifically, the cover-side locking part 11 is provided on the base end side of the branch protection part 42 (the part where the branch protection part 42 connects to the trunk line protection part 41), and the housing body-side locking part 12 is correspondingly positioned on the side of the branch wiring line 36 on the trunk line wiring line 35 side (on one side X1 in the first direction X). Thus, the position of the locking part 10 can be arbitrarily set.

[0061] The busbar module housing 100 described above includes: a housing body 50 having multiple busbar cavities 20 and wiring 30, wherein each of the multiple busbar cavities 20 internally houses a busbar 2 connected to the electrodes 211n of multiple battery cells 211 arranged side-by-side; the wiring 30 is provided with wiring material 3, which includes a trunk line 3a and multiple branch lines 3b and is electrically connected to the busbar 2; a cover 40 having a trunk line protection portion 41 for protecting the trunk line 3a and multiple branch line protection portions 42 for protecting the branch lines 3b; a hinge portion 60 connecting the cover 40 to the housing body 50 via the branch line protection portions 42; and a locking portion 10 locking the cover 40 to the housing body 50. The busbar module 1 includes a busbar 2, wiring material 3, and busbar module housing 100.

[0062] Therefore, a busbar module housing and a busbar module that can appropriately realize the structure of the cover can be provided. For example, when the cover 40 is provided on the underside of the housing body 50, and a hinge portion 60 is provided between the trunk protection portion 41 and the base plate 32 of the wiring 30 to connect the cover 40 to the housing body 50 via the trunk protection portion 41 of the cover 40, the end of the branch protection portion 42 becomes a free end. Therefore, when the cover 40 is closed, sometimes wobbling occurs, especially at the end portion of the thin branch protection portion 42. Therefore, in order to suppress this wobbling, a locking portion 10 is sometimes provided to lock the end portion of the branch protection portion 42. In particular, in the busbar module 1 installed in a battery pack used as a power source for vehicles, etc., in order to suppress wobbling caused by vibration, locking portions 10 are sometimes provided at the end portions of all branch protection portions 42 for fixation. If locking parts 10 (cover-side locking parts 11) are provided in all branch protection parts 42, the number of locking parts 10 will increase, the operation of inserting the cover-side locking parts 11 into the housing body side locking parts 12 for locking will increase, and the assembly operation of the busbar module 1 will have more steps.

[0063] Therefore, according to this embodiment, the hinge portion 60 is configured to connect the cover 40 to the housing body 50 via the branch protection portion 42 of the cover 40. Thus, the branch protection portion 42 will not be a free end, and therefore, it is unnecessary to provide locking portions 10 to each branch protection portion 42. Therefore, the number of locking portions 10 can be set to a number that prevents the cover 40 from wobbling due to vibration, etc., and the structure of the cover 40 can be appropriately realized. In this embodiment, compared to the three branch protection portions 42, two locking portions 10 can be used to lock the cover 40 to the housing body 50, eliminating the need to provide the same number of locking portions 10 as the branch protection portions 42. That is, the busbar module housing 100 is provided with a smaller number of locking portions 10 than the number of hinge portions 60.

[0064] Furthermore, hinge portions 60 are provided on all branch protection portions 42. This reduces the number of branch protection portions 42 that become free ends.

[0065] Furthermore, the locking part 10 includes a cover-side locking part 11 provided on the cover 40 and a housing body-side locking part 12 provided on the housing body 50 and locking the cover-side locking part 11 therewith. The cover-side locking part 11 is provided on the trunk protection part 41. As a result, the trunk protection part 41 of the cover 40, which is the free end, can be more reliably locked onto the housing body 50.

[0066] Alternatively, the locking part 10 may include a cover-side locking part 11 disposed on the cover 40 and a housing-body-side locking part 12 disposed on the housing body 50 and locking with the cover-side locking part 11, with the cover-side locking part 11 disposed on the branch protection part 42. Thus, the cover 40 can be locked to the housing body 50 while the branch protection part 42 is fixed.

[0067] Furthermore, the hinge portion 60 is provided at the end of the branch protection portion 42 and is located above the busbar module housing 100 (housing body 50) in the vertical direction when multiple battery cells 211 are installed. As a result, the cover 40 can be opened and closed in an upward opening manner, that is, the third third direction Z side Z1 of the cover 40 approaches or moves away from the housing body 50. Therefore, even when the locking portion 10 is released, the cover 40 can be closed by its own weight.

[0068] Furthermore, the busbar module housing and busbar module of the embodiments of the present invention described above are not limited to the embodiments described above, and various modifications can be made within the scope of the claims.

[0069] In the above description, the locking part 10 is provided on the end edge 41a of the trunk protection part 41 and the base end side of the branch protection part 42 of the cover 40. However, the configuration of the locking part 10 can be set so that the cover-side locking part 11 is located at any position of the cover 40. The locking part 10 is composed of the cover-side locking part 11 and the housing body-side locking part 12 with concave and convex fitting, but other locking structures can also be used. In addition, the hinge part 60 may not be provided on all branch protection parts 42. In addition, in addition to flexible printed circuit boards, flexible flat cables and wires can also be used as the wiring material 3.

[0070] The busbar module housing and busbar module of this embodiment can also be constructed by appropriately combining the constituent elements of the embodiments and modifications described above.

Claims

1. A busbar module housing, characterized in that, have: The housing body has multiple busbar cavities and wiring. The multiple busbar cavities respectively house busbars inside. The busbars are connected to the electrodes of the battery cells in multiple battery cells arranged side by side. The wiring is provided with wiring material including trunk lines and multiple branches and electrically connected to the busbars. The cover has a trunk line protection portion for protecting the trunk line and a plurality of branch protection portions for protecting the branch sections; A hinge portion that connects the cover to the housing body via the branch protection portion; as well as A locking part that engages the cover with the housing body.

2. The busbar module housing according to claim 1, characterized in that, The hinge portion is provided on all of the branch protection portions.

3. The busbar module housing according to claim 1 or 2, characterized in that, The locking part includes a cover-side locking part disposed on the cover and a housing-body-side locking part disposed on the housing body and locking with the cover-side locking part. The cover-side locking part is provided on the trunk line protection part.

4. The busbar module housing according to claim 1 or 2, characterized in that, The locking part includes a cover-side locking part disposed on the cover and a housing-body-side locking part disposed on the housing body and locking with the cover-side locking part. The cover-side locking part is provided on the branch protection part.

5. The busbar module housing according to claim 1 or 2, characterized in that, The hinge portion is located at the end of the branch protection portion and is positioned vertically upward when multiple battery cells are disposed thereon.

6. A busbar module, characterized in that, have: A busbar connected to the electrodes of a plurality of battery cells arranged side by side; The cabling material includes a trunk line and multiple branches, and is electrically connected to the busbar. as well as Busbar module housing The busbar module housing has: The housing body has multiple busbar cavities for accommodating the busbars and wiring lines provided with the wiring material; The cover has a trunk line protection portion for protecting the trunk line and a plurality of branch protection portions for protecting the branch sections; A hinge portion, which connects the cover to the housing body via the branch protection portion; as well as A locking part that engages the cover with the housing body.

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