Electrical junction box
By providing inner ribs and outer ribs on the second wall of the electrical connection box and second outer ribs at the end of the length direction to offset the difference in thermal expansion, the warping problem caused by heating of electronic components is solved, and the stability of the electrical connection box is achieved Improved sex and compactness.
Patent Information
- Application Number
- CN202380040401.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Priority Date
- 2022-06-01
- Filing Date
- 2023-05-17
- Publication Date
- 2024-12-13
AI Technical Summary
With the increase in the number of electronic components and the larger the electrical connection box, the warping problem caused by the difference in thermal expansion of the electronic components has not been effectively solved by the prior art.
An electrical connection box is designed, which is provided with inner ribs and outer ribs on the opposite surface of the second wall, which offsets the difference in heat retention caused by the thickness difference between the inner ribs and the outer ribs, and suppresses warpage of the second wall, and Warpage is further effectively suppressed by providing the second outer rib at the length direction end to incline and increase the size.
It effectively suppresses the warping of the electrical connection box caused by the heating of electronic components, improves the stability and compactness of the box, and prevents local reduction of strength.
Smart Images
Figure CN119137822A_ABST
Abstract
Description
Technical Field
[0001] The present disclosure relates to an electrical junction box including a substrate. This application claims the priority based on Japanese application No. 2022-089777 filed on June 1, 2022, and all the contents described in the above Japanese application are cited. Background Art
[0002] Conventionally, an electric connection box that houses electronic components such as fuses and relays is mounted on a vehicle.
[0003] The electrical junction box includes a box body, for example, which is composed of a first case having one surface side opened to accommodate the electronic component, and a second case covering the open one surface side of the first case (see Patent Document 1). Prior art literature Patent Literature
[0004] Patent document 1: Japanese Patent Application Publication No. 2016-208561. Summary of the invention
[0005] An electrical junction box according to an embodiment of the present disclosure includes a first wall in contact with a mounting object and a second wall having inner ribs protruding from a surface facing the first wall, and outer ribs protruding from a surface opposite to the facing surface of the second wall. BRIEF DESCRIPTION OF THE DRAWINGS
[0006] Figure 1 It is a perspective view of the electrical junction box according to the embodiment.
[0007] Figure 2A It is a top view of the electrical junction box according to the embodiment.
[0008] Figure 2B It is a side view of the electrical junction box according to the embodiment.
[0009] Figure 3 It is an exploded view of the electrical junction box according to the embodiment.
[0010] Figure 4 It is a partial perspective view showing a second outer rib provided at one end portion of the top wall in the electrical junction box according to the embodiment.
[0011] Figure 5 yes Figure 4 A longitudinal section view of line VV.
[0012] Figure 6 It is a partial cross-sectional view schematically showing one end portion of a top wall provided with a second outer rib in the electrical junction box according to the embodiment.
[0013] Figure 7This is a diagram showing the results of a simulation of the warping of the electrical junction box due to the difference in thermal expansion. DETAILED DESCRIPTION Problems to be Solved by the Present Disclosure
[0014] As the number of electronic components to be accommodated increases due to the diversification of functions in vehicles, the size of the electrical connection box has also increased. However, as the number of electronic components increases and the size of the electrical connection box increases, it is also susceptible to the heat generated by the electronic components when powered on. In other words, there is a problem of warping at the ends of the electrical connection box in the longitudinal direction due to the difference in thermal expansion (contraction) caused by the heat generated by the electronic components.
[0015] However, the electrical connection box of Patent Document 1 does not take such a problem into consideration and cannot cope with it.
[0016] Therefore, an object of the present invention is to provide an electrical junction box capable of suppressing warping caused by heat generation of electronic components. Effects of the present disclosure
[0017] According to the present disclosure, it is possible to provide an electrical junction box capable of suppressing warping caused by heat generation of electronic components. Description of Embodiments of the Invention
[0018] First, the embodiments of the present disclosure will be described by way of examples. In addition, at least a part of the embodiments described below may be arbitrarily combined.
[0019] (1) An electrical junction box according to an embodiment of the present disclosure includes a first wall in contact with a mounting object and a second wall having inner ribs protruding from a surface facing the first wall, and an outer rib protruding from a surface opposite to the facing surface of the second wall.
[0020] In this embodiment, inner ribs are provided on the facing surface of the second wall, and outer ribs are provided on the opposite surface opposite to the facing surface. Therefore, the difference in shrinkage between the second wall and the inner ribs caused by the difference in the amount of heat retention generated during operation is offset by the difference in shrinkage between the second wall and the outer ribs, and the warping of the second wall can be suppressed.
[0021] (2) In the electrical junction box according to the embodiment of the present disclosure, the inner rib and the outer rib have a plate shape, and the second wall is thicker than the inner rib and the outer rib.
[0022] In this embodiment, since the thickness of the second wall is thicker than that of the inner rib and the outer rib, the heat generated during operation is more likely to be retained in the second wall than in the inner rib and the outer rib, and the difference in the amount of retained heat causes a contraction difference that causes warping. However, the contraction difference generated between the second wall and the inner rib is offset by the contraction difference generated between the second wall and the outer rib, and the warping of the second wall can be suppressed.
[0023] (3) In the electrical connection box according to an embodiment of the present disclosure, the end of the second wall is inclined in the length direction so as to be closer to the first wall as it approaches the end, and there are a plurality of outer ribs, and the outer ribs in the direction in which the first wall and the second wall face each other are longer as they approach the end in the length direction.
[0024] In this embodiment, the end of the second wall is inclined so as to be closer to the first wall as it approaches the end, and the outer rib in the direction facing each other between the first wall and the second wall becomes longer as it approaches the end in the length direction. Therefore, the shrinkage difference between the second wall and the inner rib and the shrinkage difference between the second wall and the outer rib are equal and offset, thereby suppressing the warping of the second wall.
[0025] (4) In the electrical junction box according to the embodiment of the present disclosure, the outer rib is provided at an end portion of the second wall in the longitudinal direction.
[0026] In this embodiment, the outer rib is provided at the end of the second wall where the warping is largely generated. Therefore, the warping of the second wall can be suppressed more effectively.
[0027] (5) In the electrical junction box according to an embodiment of the present disclosure, a side wall extending in the facing direction is provided around an edge of the second wall, and a dimension from the first wall to a distal end of the side wall in the facing direction is constant.
[0028] In this embodiment, the dimension from the first wall to the end of the side wall in the facing direction is constant. Therefore, it is possible to prevent the strength of the second wall from being locally reduced due to the end of the second wall being inclined so as to approach the first wall. Details of the embodiments of the present invention
[0029] Hereinafter, an electric junction box according to an embodiment of the present disclosure will be described with reference to the drawings. It should be noted that the present invention is not limited to these examples, but is indicated by the claims, and is intended to include all modifications within the meaning and scope equivalent to the claims.
[0030] Figure 1is a perspective view of an electrical junction box 100 according to an embodiment. Figure 2A to Figure 2B 1 is a top view and a side view of an electrical junction box 100 according to an embodiment. Figure 3 It is an exploded view of the electrical junction box 100 according to the embodiment. Figure 2A is a top view of the electrical connection box 100, Figure 2B 2 is a side view of the electrical connection box 100. The electrical connection box 100 is mounted on the outside of an object to be mounted, such as a battery pack 200 (see FIG. 2 ) of an EV (Electric Vehicle). Figure 2B In FIG. 1 , for convenience of explanation, the state in which the electrical connection box 100 is installed in the battery pack 200 is shown.
[0031] The electrical connection box 100 includes, for example, a box body 50 that accommodates a fuse, a substrate, etc. The box body 50 is a flat box body that is substantially rectangular in plan view, and has a shape in which one corner of one end in the longitudinal direction is cut into a stepped shape. The box body 50 is made of, for example, resin, and is composed of a lower case 30 mounted on the assembly object and an upper case 20 covering the lower case 30. In the following, for the sake of convenience, the upper case 20 side is described as the upper side and the lower case 30 side is described as the lower side.
[0032] The lower case 30 is in the shape of a box with one side open on the upper case 20 side. The lower case 30 has a bottom wall 31 (first wall) whose outer side is in contact with the assembly object and a side wall 33 extending vertically from the edge of the bottom wall 31 toward the upper case 20 side. Ribs are formed at multiple locations on the inner side of the lower case 30 (see Figure 3 ).
[0033] The bottom wall 31 of the lower case 30 has recesses 32b formed at both ends in the longitudinal direction and a recess 32a formed in the middle. The recesses 32a and 32b are formed at positions corresponding to the fastening portions 23 of the upper case 20 described later.
[0034] Specifically, recesses 32b are formed at the two corners of the two ends of the lower housing 30. Each recess 32b is substantially rectangular in plan view, and in each recess 32b, the side wall 33 is bent at a substantially right angle, and the recessed corners are chamfered (see FIG. Figure 3 ).
[0035] In addition, a recess 32a is formed in the middle of the long side of the lower housing 30. The recess 32a is substantially rectangular in plan view. In the recess 32a, the side wall 33 is recessed toward the inner side of the lower housing 30, and the recessed corners are chamfered (see FIG. Figure 3 ).
[0036] The upper case 20 is in the shape of a box with one surface open on the side of the lower case 30. The upper case 20 is slightly larger in the longitudinal direction and in the width direction perpendicular to the longitudinal direction than the lower case 30, and covers the lower case 30.
[0037] In addition, the upper shell 20 has a top wall 21 (second wall) facing the bottom wall 31 of the lower shell 30 and a side wall 22 surrounding the edge of the top wall 21 and extending in the up-down direction. The upper shell 20 is provided with fastening parts 23 at both ends and the middle part in the longitudinal direction for mounting the upper shell 20 (box 50) to the assembly object.
[0038] Specifically, the fastening parts 23 are provided at two corners of one end in the length direction, and at two corners of the other end and between the two corners. Moreover, in the upper shell 20, three fastening parts 23 are also provided in parallel along the width direction in the middle part in the length direction. Each fastening part 23 is provided protrudingly on the inner side surface 214 (opposing surface) of the top wall 21 facing the bottom wall 31 (refer to Figure 5 ), except for one fastening portion 23 in the substantially central portion of the top wall 21, the other fastening portions 23 are provided near the side wall 22 (refer to Figure 2A ).
[0039] A plurality of inner ribs 25 are provided on the inner side surface 214 of the top wall 21 (see Figure 5 ). A plurality of inner ribs 25 are arranged in parallel along the longitudinal direction, and each inner rib 25 is in the shape of a plate extending along the width direction. In addition, the thickness of each inner rib 25 is thinner than the thickness of the top wall 21.
[0040] Each fastening portion 23 has a bottomed cylindrical shape, and the top wall 21 side is open. In addition, a fixing through hole 231 (see FIG. 21 ) used when the box 50 is mounted on the assembly object is formed at the bottom of each fastening portion 23. Figure 5 The box body 50 (electrical junction box 100 ) can be mounted on the mounting object by inserting a screw from the mounting object into the fixing through hole 231 of the fastening portion 23 and screwing the screw into a nut (not shown) provided in the fastening portion 23 .
[0041] As described above, the fastening portion 23 of the upper case 20 is arranged inside the recessed portion 32 a and the recessed portion 32 b of the lower case 30 .
[0042] Various connection parts 212 for connecting to other devices are provided at multiple locations on the outer side surface 211 (opposite side) of the top wall 21 opposite to the inner side surface 214. In addition, a plurality of mounting seats 213 for relays 400 are provided at the approximate center of the outer side surface 211 of the top wall 21, and a plurality of relays 400 are mounted. Figure 3 In the figure, for convenience, the illustration of the relay 400 is omitted.
[0043] A plurality of outer ribs 24 are projected from the outer side surface 211 of the top wall 21. The outer ribs 24 include first outer ribs 24a for preventing warping due to gravity and second outer ribs 24b (outer ribs) for preventing warping due to a difference in thermal expansion as described later.
[0044] The first outer ribs 24a are triangular plate-shaped and are mainly provided at the edge of the top wall 21. That is, the first outer ribs 24a have smaller dimensions in the vertical direction as they move from the center of the top wall 21 to the edge. As described above, the first outer ribs 24a prevent the top wall 21 from being deformed by the relay 400 (see FIG. 1 ) mounted at the center. Figure 1 and Figure 2) due to the weight.
[0045] The second outer rib 24b is plate-shaped and is disposed at the end of the top wall 21 in the longitudinal direction. For convenience, in this embodiment, the second outer rib 24b is provided at only one end of the top wall 21 as an example for explanation, but it is not limited to this and can also be provided at both ends. The thickness of each second outer rib 24b is thinner than the thickness of the top wall 21.
[0046] Figure 4 1 is a partial perspective view showing a second outer rib 24b provided at one end portion 21a of a top wall 21 in an electrical junction box 100 according to the embodiment. Figure 5 yes Figure 4 A longitudinal section view of line VV.
[0047] As described above, the second outer rib 24b is provided at one end 21a of the top wall 21. The second outer rib 24b is provided at a position corresponding to or near the corresponding position of the inner rib 25 in the up-down direction. The closer the second outer rib 24b is to the edge of the top wall 21, the larger the dimension in the up-down direction (hereinafter also referred to as the height) is.
[0048] like Figure 5 As shown, the top wall 21 is inclined downward at one end 21a in the longitudinal direction. That is, in the top wall 21, the one end 21a provided with the second outer rib 24b is inclined so as to be closer to the bottom wall 31 of the lower case 30 as it approaches the edge, and the other parts of the top wall 21 except the one end 21a are kept at a constant interval from the bottom wall 31. In addition, the dimension L from the bottom wall 31 to the upper end (hereinafter referred to as the upper end dimension L) is substantially the same at all the second outer ribs 24b.
[0049] As described above, the upper end dimensions L of the plurality of second outer ribs 24b are the same. In contrast, one end 21a of the top wall 21 is inclined downward as it approaches the edge. Therefore, the closer to the edge of the top wall 21, the larger the vertical dimension of the second outer rib 24b itself.
[0050] In addition, as described above, although one end 21a of the top wall 21 is inclined downward as it approaches the edge, the size from the bottom wall 31 of the lower shell 30 to the end of the side wall 22 of the upper shell 20, that is, the upper end of the side wall 22, is constant in the up and down direction.
[0051] That is, Figure 4 As shown, the dimension H1 of the edge of one end portion 21a of the top wall 21 in the length direction, i.e., the short side of the top wall 21 from the bottom wall 31 to the upper end of the side wall 22 is the same as the dimension H2 of the long side of the top wall 21 from the bottom wall 31 to the upper end of the side wall 22.
[0052] Since the electrical junction box 100 according to the embodiment has such a structure, the second outer ribs 24b can suppress the occurrence of warping in the top wall 21 due to the difference in thermal expansion as described above.
[0053] Figure 6 1 is a partial cross-sectional view schematically showing one end portion 21a of the top wall 21 provided with the second outer rib 24b in the electrical junction box 100 according to the embodiment. Figure 7 1 is a diagram showing the result of simulating the warping of the electrical junction box 100 caused by the difference in thermal expansion. Figure 7 Only the outline of the electrical connection box is shown. Figure 7 A in FIG. 2 shows a case where one end portion 21a of the top wall 21 is not inclined and the second outer rib 24b is not provided. Figure 7 B in the figure shows a case where the one end portion 21a of the top wall 21 is inclined and the second outer rib 24b is provided, that is, a case of the electrical junction box 100 according to the present embodiment.
[0054] When the one end portion 21a of the top wall 21 is not inclined and only the inner rib 25 and the first outer rib 24a are provided (see Figure 6 ), during the operation of the electrical connection box 100, the relay 400 and the like generate heat, thereby causing the end of the top wall 21 to warp toward the upper side where the inner rib 25 is not provided (see Figure 7 A).
[0055] This is because the top wall 21 is thicker than the inner ribs 25 and is in direct contact with the heat source (such as the relay 400 ), etc., and therefore retains a large amount of generated heat, while the inner ribs 25 are thin and easily air-cooled, thereby causing a difference in contraction (thermal expansion) between the top wall 21 and the inner ribs 25 .
[0056] In contrast, in the electrical junction box 100 according to the present embodiment, as described above, the second outer rib 24b is formed on the outer side surface 211 of the top wall 21. Therefore, the difference in contraction between the top wall 21 and the inner rib 25 is offset by the difference in contraction between the top wall 21 and the second outer rib 24b, and warping of the top wall 21 can be suppressed.
[0057] like Figure 7 As shown in B in FIG. 1 , in the electrical junction box 100 according to the present embodiment, the second outer rib 24 b is formed on the outer side surface 211 of the top wall 21 , so that the top wall 21 can be prevented from warping.
[0058] Furthermore, in the electrical junction box 100 according to the present embodiment, as described above, the end portion 21a of the top wall 21 provided with the second outer rib 24b is inclined downward as it approaches the edge, so that the height of the second outer rib 24b increases as it approaches the edge of the top wall 21 (see Figure 6 The dotted line portion of FIG. 21 can improve the air cooling effect. Therefore, the warping of the top wall 21 can be more appropriately suppressed.
[0059] As described above, in the electrical connection box 100 according to the present embodiment, the height of the second outer rib 24b is ensured by tilting the one end 21a of the top wall 21 downward. Therefore, the height of the second outer rib 24b can be suppressed, and the electrical connection box 100 can be made compact.
[0060] Furthermore, in the electrical junction box 100 according to the present embodiment, as described above, the second outer ribs 24b are provided at the ends of the top wall 21 where warping may occur. Thus, by emphasizing the second outer ribs 24b at the locations where warping may occur in the top wall 21, the electrical junction box 100 according to the embodiment can be made compact and the warping of the top wall 21 can be more effectively suppressed.
[0061] It should be noted that, in the electrical junction box 100 according to the present embodiment, as described above, the one end 21a of the top wall 21 is inclined downward as it approaches the edge, and the dimension from the bottom wall 31 to the end of the side wall 22 of the upper case 20 in the vertical direction is constant. Therefore, it is possible to prevent the strength of the upper case 20 from being partially reduced at the one end 21a of the top wall 21.
[0062] The embodiments disclosed this time should be considered as illustrative in all aspects and not restrictive. The scope of the present invention is indicated by the claims rather than the above meaning, and is intended to include all modifications within the meaning and scope equivalent to the claims.
[0063] The matters described in each embodiment can be combined with each other. In addition, the independent claims and dependent claims described in the claims can be combined with each other in all combinations regardless of the reference form. Moreover, the form of recording a claim that references two or more other claims (multiple reference claim form) is used in the claims, but it is not limited to this. It can also be recorded in the form of recording a multiple reference claim (multiple reference multiple claim) that references at least one multiple reference claim. Description of Reference Numerals
[0064] 20 Upper shell
[0065] 21 Top wall (second wall)
[0066] 21a One end
[0067] 22 Sidewall
[0068] 23 Fastening part
[0069] 24 lateral rib
[0070] 24a First outer rib
[0071] 24b Second outer rib
[0072] 25 medial rib
[0073] 30 Lower housing
[0074] 31 bottom wall (first wall)
[0075] 32a recess
[0076] 32b concave part
[0077] 33 Sidewall
[0078] 50 Cabinet
[0079] 100 electrical connection box
[0080] 200 battery pack
[0081] 211 Outer side (opposite side)
[0082] 212 connection
[0083] 213 assembly seat
[0084] 214 inner side (facing side)
[0085] 231 fixed through hole
[0086] 400 relays.
Claims
1. An electrical connection box, comprising a first wall to be connected to an assembly object and a second wall having an inner rib protruding from a surface facing the first wall, An outer rib is protrudingly provided on the opposite surface of the second wall which is opposite to the facing surface.
2. The electrical connection box according to claim 1, wherein: The inner rib and the outer rib are in a plate shape, The second wall is thicker than the inner rib and the outer rib.
3. The electrical connection box according to claim 1 or 2, wherein: In the length direction, the end of the second wall is inclined so as to be closer to the first wall as it approaches the end. There are multiple outer ribs. The closer to the end in the longitudinal direction, the longer the dimension of the outer rib in the facing direction of the first wall and the second wall.
4. The electrical connection box according to claim 3, wherein: The outer rib is provided at an end portion of the second wall in the longitudinal direction.
5. The electrical connection box according to claim 3, wherein: A side wall extending in the facing direction is arranged around the edge of the second wall, and a size from the first wall to a terminal end of the side wall in the facing direction is constant.