loop construct

Abstract

This invention discloses a circuit configuration that cleverly utilizes the available space within the case to ensure ample volume and heat dissipation performance required for the power supply busbars. [Solution] The circuit configuration 10 comprises a case 16, a power supply bus bar 14 routed inside the case 16 to form a power supply path 12, a heat dissipation fin portion 18 protruding from the power supply bus bar 14 toward an empty space inside the case 16, and a vibration suppression portion 20 provided on the case 16 to contact the heat dissipation fin portion 18 and suppress vibration of the heat dissipation fin portion 18.

Description

Technical Field

[0004] , ,

[0005] , ,

[0001] The present disclosure relates to a circuit component.

Background Art

[0002] Patent Document 1 discloses a circuit component mounted on an electric vehicle such as a hybrid or an electric vehicle, which distributes the power supplied from a battery to various vehicle loads. The circuit component has a structure in which a plurality of busbars for energization constituting an energization path are routed in a case, and various electrical components such as relays and fuses are connected to these busbars for energization. With the increase in the current of recent vehicles, the Joule heat generated in the busbar during energization has also increased, and the required volume and heat dissipation performance required for the busbar for energization have also increased. Therefore, in Patent Document 1, a structure is adopted in which a heat dissipation busbar is bolted to the terminal portion of an electrical component together with the busbar for energization, and heat generated in the busbar for energization and the electrical component is transferred to a heat dissipation target through the heat dissipation busbar.

Prior Art Documents

Patent Documents

[0003] <​​​​​​​​​​​​​​​​​​ [Means for solving the problem]

[0006] The circuit configuration of the present disclosure comprises a case, a power supply bus bar routed within the case to constitute a power supply path, a heat dissipation fin portion protruding from the power supply bus bar toward an empty space within the case, and a vibration suppression portion provided on the case to contact the heat dissipation fin portion and suppress vibration of the heat dissipation fin portion. [Effects of the Invention]

[0007] According to the circuit configuration of this disclosure, the available space inside the case can be effectively utilized to significantly increase the required volume and heat dissipation performance for the power supply busbars. [Brief explanation of the drawing]

[0008] [Figure 1] Figure 1 is a perspective view showing the main parts of the circuit configuration according to Embodiment 1. [Figure 2] Figure 2 is a front view of the circuit configuration shown in Figure 1. [Figure 3] Figure 3 is a cross-sectional view taken along line III-III of the circuit configuration shown in Figure 1. [Figure 4] Figure 4 is a perspective view showing the circuit configuration shown in Figure 1 with the upper case removed. [Figure 5] Figure 5 is a perspective view of the upper case, which constitutes the circuit configuration shown in Figure 1, from the bottom side. [Modes for carrying out the invention]

[0009] <Description of Embodiments in this Disclosure> First, embodiments of this disclosure will be listed and described. The circuit configuration disclosed herein is (1) The device comprises a case, a power supply bus bar routed within the case to constitute a power supply path, a heat dissipation fin portion protruding from the power supply bus bar toward an empty space within the case, and a vibration suppression portion provided on the case to contact the heat dissipation fin portion and suppress vibration of the heat dissipation fin portion.

[0010] According to this embodiment, the power supply busbar is provided with heat dissipation fins that protrude from the power supply busbar toward the empty space inside the case, so that the required volume for the power supply busbar can be secured by utilizing the heat dissipation fins. Moreover, since the heat dissipation fins protrude toward the empty space inside the case, the heat from the power supply busbar can be released to the air inside the case from the heat dissipation fins, and the heat dissipation performance required for the power supply busbar can also be improved by utilizing the heat dissipation fins. As a result, even when it is not possible to secure space to extend the heat dissipation busbar to the external housing as in conventional structures, it is possible to provide a circuit configuration that can cleverly utilize the empty space inside the case to secure a large required volume and heat dissipation performance for the power supply busbar.

[0011] Furthermore, since the heat dissipation fins protrude from the power supply busbars, there is a risk that the free end of the fins may vibrate when mounted in a vehicle, generating abnormal noise or even being damaged due to resonance. However, in this embodiment, the vibration suppression part provided on the case contacts the free end of the heat dissipation fins, thereby suppressing vibrations of the heat dissipation fins. As a result, the vibration problem inherent in the heat dissipation fins, which are cantilevered and held by the power supply busbars, is also suppressed, providing an even better circuit configuration.

[0012] The heat dissipation fins may be attached to the current busbar by extending and bending one end of the same busbar as the current busbar, or they may be made from a separate busbar and attached to the current busbar by any fixing means such as bolting or welding.

[0013] (2) In (1) above, it is preferable that the vibration suppression portion has a pair of opposing wall portions that protrude from the case toward the heat dissipation fin portion and are arranged opposite each other with a gap between them, and the heat dissipation fin portion is inserted between the opposing wall portions. Since the vibration suppression portion has a pair of opposing wall portions that protrude from the case and are arranged opposite each other with a gap between them, the vibration of the heat dissipation fin can be stably suppressed by inserting the heat dissipation fin between the opposing wall portions.

[0014] (3) In (2) above, it is preferable that at least one of the pair of opposing wall portions is provided with a pressure contact rib that protrudes toward the other side and presses against the heat dissipation fin portion. The heat dissipation fin portion can be held between the opposing wall portions with the pressure contact rib protruding from at least one of the opposing wall portions in contact, and vibration suppression of the heat dissipation fin by the vibration suppression portion can be realized more effectively.

[0015] (4) In any one of (1) to (3) above, it is preferable that the energizing busbar comprises a first busbar and a second busbar separate from the first busbar and connected to the first busbar, the second busbar having a connecting portion connected to the first busbar and a free end protruding from the connecting portion toward the empty space in the case, and the heat dissipation fin portion is formed by the free end. Since the heat dissipation fin portion is formed using the free end of the second busbar connected to the first busbar, the design freedom of the heat dissipation fin portion is improved, making it possible to add heat dissipation fins that make good use of the empty space, thereby improving manufacturability.

[0016] (5) In any one of (1) to (4) above, it is preferable that the heat dissipation fin portion is provided protruding from the current-carrying busbar by extending and bending one end of the current-carrying busbar. Since the heat dissipation fin portion is formed by extending and bending one end of the current-carrying busbar, the heat dissipation fin portion can be provided with fewer parts, thereby improving manufacturability.

[0017] (6) In any one of the above (1) to (5), it is preferable that a plurality of the heat radiation fin portions project from the bus bar for energization, and adjacent heat radiation fin portions are separated from each other with a gap therebetween. Since a plurality of heat radiation fin portions separated from each other are provided projecting from the bus bar for energization, the volume and heat radiation performance of the bus bar for energization can be more advantageously increased. And, by arranging the plurality of heat radiation fin portions separately from each other, the air flow between the heat radiation fins can be promoted and further improvement in heat radiation performance can be achieved.

[0018] <Details of Embodiments of the Present Disclosure> A specific example of the circuit component of the present disclosure will be described below with reference to the drawings. Note that the present disclosure is not limited to these examples, and is intended to be represented by the claims and to include all changes within the meaning and scope equivalent to the claims.

[0019] <Embodiment 1> Hereinafter, the circuit component 10 of Embodiment 1 of the present disclosure will be described with reference to FIGS. 1 to 5. This circuit component 10 constitutes, for example, an electrical connection box disposed inside a battery pack or the like in an electric vehicle or a hybrid vehicle, and includes a bus bar 14 for energization that constitutes an energization path 12, and a case 16 that holds the bus bar 14 for energization. Note that the circuit component 10 and the electrical connection box configured to include the circuit component 10 can be arranged in any orientation, but in the following, the up-down, left-right, and front-back directions will be described as the up-down, left-right, and front-back directions shown in FIG. 1. Also, for a plurality of identical members, only some of the members may be labeled with reference numerals, and the reference numerals may be omitted for other members.

[0020] <Circuit Component 10> As described above, the circuit configuration 10 comprises a case 16 and a power supply busbar 14 routed within the case 16 to constitute a power supply path 12. The power supply busbar 14 is provided with a heat dissipation fin portion 18, which protrudes toward the empty space within the case 16. The case 16 is also provided with a vibration suppression portion 20 that contacts the heat dissipation fin portion 18 to suppress vibration of the heat dissipation fin portion 18. In Embodiment 1, the power supply busbar 14 is composed of two separate busbars, a first busbar 22 and a second busbar 24. Heat-generating components such as relays and fuses (not shown) are arranged in the power supply path 12, and these heat-generating components are electrically connected to the power supply busbar 14. As a result, the heat generated when current is supplied to the relays and fuses is transferred to the power supply busbar 14 and dissipated from the heat dissipation fin portion 18.

[0021] <Power busbar 14> As described above, in Embodiment 1, a current-carrying busbar 14 is configured to constitute the current-carrying path 12, including a first busbar 22 and a second busbar 24. The current-carrying path 12 is mainly composed of the first busbar 22, and the second busbar 24 is an additional busbar provided to increase the cross-sectional area of ​​the busbars in the current-carrying path 12. Both the first busbar 22 and the second busbar 24 that constitute the current-carrying busbar 14 are made of copper (including copper alloys) or aluminum (including aluminum alloys), which are metals with excellent conductive properties, and are formed by bending a metal sheet made of the above material into a predetermined shape.

[0022] <1st Bus Bar 22> Since the first busbar 22 constitutes the energizing path 12, busbars 26 (shown as dashed lines in Figure 3, indicating the busbar 26 connected to one side of the first busbar 22 in the longitudinal direction) are connected to both sides of the first busbar 22 in the longitudinal direction, for example, to be routed inside an electrical junction box. Bolt insertion holes 27 are formed in the busbars 26, through which bolts 32, described later, are inserted. In Embodiment 1, the first busbar 22 extends in the left-right direction as a whole, and left-side connection parts 28 and right-side connection parts 30 are provided on both the left and right sides of the first busbar 22 to which the busbars 26 are connected. Bolt insertion holes 34 are formed in the left-side connection part 28 and right-side connection part 30, passing through them in the thickness direction, through which bolts 32 (shown as dashed lines in Figure 3, indicating the left bolt 32) for connecting the busbars 26 are inserted. In particular, in Embodiment 1, the bolt insertion hole 34 in the left connection portion 28 is formed to penetrate in the front-to-back direction, and the bolt insertion hole 34 in the right connection portion 30 is formed to penetrate in the up-to-down direction.

[0023] Specifically, the first busbar 22 is provided with a left-right extension portion 36 that extends in the left-right direction with a predetermined width dimension (front-to-back dimension), and the left portion of this left-right extension portion 36 constitutes the left-side connection portion 28. The left end of the first busbar 22 bends downward from the left-right extension portion 36 (left-side connection portion 28), and this downwardly extending portion constitutes the left-side first heat dissipation fin portion 38, which is one of the heat dissipation fin portions 18.

[0024] On the other hand, the right end of the first busbar 22 bends upward from the left-right extension portion 36, and this upwardly extending portion constitutes the right first heat dissipation fin portion 40, which is one of the heat dissipation fin portions 18. This right first heat dissipation fin portion 40 has a larger front-to-back dimension than the left-right extension portion 36 and protrudes forward from the left-right extension portion 36. Furthermore, the portion of the right first heat dissipation fin portion 40 that protrudes forward from the left-right extension portion 36 has a portion that extends downward, and the lower portion of this downwardly extending portion constitutes the right connection portion 30 described above. In short, the left and right first heat dissipation fin portions 38 and 40 are provided so as to protrude outward in the vertical direction relative to the left-right extension portion 36 of the first busbar 22, by extending and bending the end of the first busbar 22 which constitutes the power supply busbar 14.

[0025] <2nd Bus Bar 24> The second busbar 24 is provided to increase the cross-sectional area of ​​the busbars constituting the current path 12, as described above, and is superimposed on and connected to the first busbar 22, and has a connecting portion 42 that constitutes a part of the current path 12. The connecting portion 42 is a substantially flat plate shape that extends in the left-right direction with a predetermined width dimension (front-to-back dimension), and is superimposed on the left-right extension portion 36 of the first busbar 22 from above. The connecting portion 42 has bolt insertion holes 44 that penetrate in the thickness direction (up-down direction), and when the connecting portion 42 and the left-right extension portion 36 are superimposed, the upper and lower bolt insertion holes 44, 34 communicate in the up-down direction. The busbar 26 inside the electrical junction box is superimposed on the overlapping portion of these connection parts 42 and the left and right extension parts 36, and bolts 32 are inserted through the respective bolt insertion holes 44, 34, and 27. These bolts 32 are fastened to nuts (not shown) provided on the lower case 52, which will be described later, thereby electrically connecting the energizing busbar 14 and the busbar 26 inside the electrical junction box.

[0026] Furthermore, the second busbar 24 is also provided with a heat dissipation fin section 18, similar to the first busbar 22. Specifically, the second busbar 24 has a connecting section 42 and a free end that protrudes from the connecting section 42 toward the empty space inside the case 16, and this free end constitutes the heat dissipation fin section 18. More specifically, the free end at the left end of the second busbar 24 bends upward from the connecting section 42 and extends upward, and this upwardly extending portion constitutes the left second heat dissipation fin section 46, which is one of the heat dissipation fin sections 18. Also, the free end at the right end of the second busbar 24 bends upward from the connecting section 42 and extends upward, and this upwardly extending portion constitutes the right second heat dissipation fin section 48, which is one of the heat dissipation fin sections 18. This right second heat dissipation fin section 48 has a larger front-to-back dimension than the connecting section 42 and protrudes forward from the connecting section 42. In short, in the second busbar 24 as well, the left and right second heat dissipation fin portions 46 and 48 are provided so as to protrude outward in the vertical direction from the connection portion 42 of the second busbar 24, by extending and bending the ends of the second busbar 24 that constitute the energizing busbar 14.

[0027] Furthermore, with the first busbar 22 and the second busbar 24 fixed to each other, the left first heat dissipation fin section 38 and the left second heat dissipation fin section 46 are located at approximately equal positions in the left-right direction, and at the left end of the power supply busbar 14, the left first heat dissipation fin section 38 and the left second heat dissipation fin section 46 each protrude outward in the vertical direction. In addition, the right first heat dissipation fin section 40 is located to the right of the right second heat dissipation fin section 48, and the right first heat dissipation fin section 40 and the right second heat dissipation fin section 48 face each other with a predetermined gap in the left-right direction. That is, at the right end of the power supply busbar 14, multiple heat dissipation fin sections 18 are provided, with the right first heat dissipation fin section 40 and the right second heat dissipation fin section 48 each protruding upward, and these adjacent right first heat dissipation fin section 40 and right second heat dissipation fin section 48 are separated from each other with a gap in the left-right direction.

[0028] <Case 16> The figure shows the main parts of an electrical junction box composed of a circuit assembly 10 according to this disclosure, and only a part of the case 16 of the circuit assembly 10 is shown. In Embodiment 1, the case 16 is composed of an upper case 50 and a lower case 52 that can be assembled and detached in the vertical direction. The aforementioned vibration suppression unit 20 is provided on the upper case 50 that constitutes the case 16.

[0029] <Upper Case 50> The shape of the upper case 50 is not limited, but for example it can be a roughly box shape with an opening at the bottom. The upper case 50 has a roughly flat upper bottom wall portion 54 that can cover the upper opening of the lower case 52. The vibration suppression portion 20 is provided on the upper bottom wall portion 54 at a position corresponding to the arrangement position of the right first heat dissipation fin portion 40 and the right second heat dissipation fin portion 48 described above.

[0030] <Vibration suppression part 20> The vibration suppression section 20 has a pair of opposing wall sections 56, 56 that protrude downward from the upper case 50 (upper bottom wall section 54) toward the heat dissipation fin section 18 (right first and second heat dissipation fin sections 40, 48) and are arranged opposite each other with a gap between them, and the right first and second heat dissipation fin sections 40, 48 are inserted between these opposing wall sections 56, respectively. In other words, the vibration suppression section 20 of Embodiment 1 has a pair of first opposing wall sections 56a, 56a into which the right first heat dissipation fin section 40 is inserted, and these first opposing wall sections 56a are provided spaced apart from each other in the left-right direction. The vibration suppression section 20 also has a pair of second opposing wall sections 56b, 56b into which the right second heat dissipation fin section 48 is inserted, and these second opposing wall sections 56b are provided spaced apart from each other in the left-right direction.

[0031] Since the right-side first heat dissipation fin section 40 is located to the right of the right-side second heat dissipation fin section 48, each first opposing wall section 56a is located to the right of each second opposing wall section 56b. In Embodiment 1, the four opposing wall sections 56 (each first opposing wall section 56a and each second opposing wall section 56b) are arranged at a predetermined distance apart in the left-right direction. Each of these first opposing wall sections 56a and each second opposing wall section 56b has a front-to-back dimension that is slightly larger than the right-side first heat dissipation fin section 40 and the right-side second heat dissipation fin section 48, respectively. Therefore, the right-side first heat dissipation fin section 40 and the right-side second heat dissipation fin section 48 are held by being sandwiched between each first opposing wall section 56a and each second opposing wall section 56b over their entire length in the front-to-back direction.

[0032] Furthermore, in Embodiment 1, at least one of the pair of opposing wall portions 56 is provided with a pressure contact rib 58 that protrudes toward the other side and presses against the heat dissipation fin portion 18 (the first and second heat dissipation fin portions 40 and 48 on the right side). In particular, in Embodiment 1, a pressure contact rib 58 extending in the vertical direction is provided on the inner surface of each first opposing wall portion 56a and each second opposing wall portion 56b. Multiple pressure contact ribs 58 are provided on the inner surface of each first opposing wall portion 56a and each second opposing wall portion 56b, and the multiple pressure contact ribs 58 are provided at predetermined intervals in the front-rear direction. In short, the distance between the pressure contact ribs 58 provided on the inner surface of each first opposing wall portion 56a in the left-right direction is the same as or slightly smaller than the thickness dimension (left-right dimension) of the right first heat dissipation fin portion 40, and the right first heat dissipation fin portion 40 is inserted between the first opposing wall portions 56a while sliding against each pressure contact rib 58. Similarly, the distance between each pressure contact rib 58 provided on the inner surface of each second opposing wall portion 56b in the left-right direction is the same as or slightly smaller than the thickness dimension (left-right dimension) of the right second heat dissipation fin portion 48, and the right second heat dissipation fin portion 48 is inserted between each second opposing wall portion 56b while sliding against each pressure contact rib 58.

[0033] <Lower Case 52> The shape of the lower case 52 is not limited, but for example it can be a roughly box-shaped structure that opens upward. The lower case 52 has, for example, a roughly flat bottom wall portion 60 that extends horizontally (in a direction perpendicular to the vertical direction). At predetermined positions on the bottom wall portion 60, there is a bolt fixing portion 62 that protrudes upward and to which the aforementioned bolt 32 is fixed. A nut (not shown) is positioned at the upper end of this bolt fixing portion 62 in a roughly embedded state, so that when the connection portion 42, the left connection portion 28 and the busbar 26 are superimposed, the bolt 32 inserted through these bolt insertion holes 44, 34, and 27 are fastened.

[0034] <Method for assembling circuit component 10> In the circuit assembly 10 of Embodiment 1, with the busbar 26 placed and fixed on the bolt fixing portion 62 of the lower case 52, the left connection portion 28 of the first busbar 22 and the connection portion 42 of the second busbar 24 are superimposed from above the busbar 26. Then, bolts 32 are inserted through the bolt insertion holes 44, 34, and 27 and fastened to nuts (not shown) provided on the bolt fixing portion 62. This fixes the energizing busbar 14 to the lower case 52. Subsequently, the upper case 50 is brought closer to the lower case 52 to which the energizing busbar 14 is fixed from above, and the right first heat dissipation fin portion 40 of the first busbar 22 is inserted between the first opposing wall portions 56a of the vibration suppression portion 20, and the right second heat dissipation fin portion 48 of the second busbar 24 is inserted between the second opposing wall portions 56b of the vibration suppression portion 20. In this state, the circuit assembly 10 is completed by fixing the upper case 50 and the lower case 52 together using a known fixing mechanism (not shown) (for example, a locking mechanism). A busbar (not shown) inside the electrical junction box can be bolted to the right-side connection 30 at any time.

[0035] According to the circuit configuration 10 of Embodiment 1, which has the structure described above, the power supply bus bar 14 is provided with heat dissipation fins 18 (particularly the right first heat dissipation fin 40 and the right second heat dissipation fin 48) that protrude toward the empty space inside the case 16, and the vibration of these heat dissipation fins 40 and 48 is suppressed by the vibration suppression unit 20 provided on the upper case 50. With the power supply bus bar 14 provided with heat dissipation fins 18 (left and right first heat dissipation fins 38 and 40 and left and right second heat dissipation fins 46 and 48), the heat generated by heat-generating components such as relays and fuses provided inside the electrical connection box is dissipated by these heat dissipation fins 38, 40, 46, and 48. Since each of these heat dissipation fin sections 18 (for example, the right-side first heat dissipation fin section 40 and the right-side second heat dissipation fin section 48) protrudes toward the empty space inside the case 16, there is no need to secure additional space for routing these heat dissipation fin sections 40 and 48, thus avoiding the case 16 becoming unnecessarily large.

[0036] In particular, vibrations are input to the circuit component 10 due to vehicle operation, etc., but the vibration suppression section 20 provided on the upper case 50 can suppress vibrations of the right first heat dissipation fin section 40 and the right second heat dissipation fin section 48, i.e., the power supply bus bar 14, eliminating the need for a vibration suppression mechanism for the power supply bus bar 14 made of a separate component. As a result, the circuit component 10 having a heat dissipation mechanism and a vibration suppression mechanism for the power supply bus bar 14 can be formed compactly and with a small number of parts.

[0037] The vibration suppression unit 20 has a pair of opposing wall portions 56 (each a first opposing wall portion 56a and each a second opposing wall portion 56b), with the right first heat dissipation fin portion 40 inserted between each first opposing wall portion 56a, and the right second heat dissipation fin portion 48 inserted between each second opposing wall portion 56b. This makes it possible to stably suppress vibrations of the right first heat dissipation fin portion 40 and the right second heat dissipation fin portion 48.

[0038] In particular, the inner surfaces of each of the first opposing wall portions 56a and each of the second opposing wall portions 56b are provided with pressure contact ribs 58 that press against the right first heat dissipation fin portion 40 and the right second heat dissipation fin portion 48, respectively. This makes it possible to more reliably suppress vibrations of the right first heat dissipation fin portion 40 and the right second heat dissipation fin portion 48.

[0039] In Embodiment 1, the energizing busbar 14 is configured to include a first busbar 22 and a second busbar 24. In the energizing busbar 14, the cross-sectional area of ​​the energizing busbar 14 is increased at the overlapping portion of the first busbar 22 and the second busbar 24, allowing it to handle large currents. In particular, since the first busbar 22 and the second busbar 24 are integrally fixed by bolts 32, it is not necessary to separately employ vibration suppression mechanisms for the first busbar 22 and the second busbar 24, and a simpler vibration suppression mechanism can be adopted.

[0040] Each of the heat dissipation fins 38, 40, 46, and 48 is provided by extending and bending the ends of the first busbar 22 and the second busbar 24, so that they protrude outward in the vertical direction from the left-right extension portion 36 and the connecting portion 42. In other words, each of the heat dissipation fins 38, 40, 46, and 48 is integrally provided with the first busbar 22 and the second busbar 24, and the first busbar 22 and the second busbar 24 equipped with each of the heat dissipation fins 38, 40, 46, and 48 can be easily formed by bending a metal sheet into a predetermined shape.

[0041] In the power supply busbar 14, the right-side first heat dissipation fin section 40 and the right-side second heat dissipation fin section 48 are separated from each other by a gap in the left-right direction. That is, since the right-side first heat dissipation fin section 40 and the right-side second heat dissipation fin section 48 do not overlap in the left-right direction, high precision is not required when manufacturing the first busbar 22 and the second busbar 24, and the first busbar 22 and the second busbar 24 can be easily formed. Furthermore, since heat dissipation is possible by utilizing the space between the right-side first heat dissipation fin section 40 and the right-side second heat dissipation fin section 48, the heat dissipation performance is also improved.

[0042] <Variation> While Embodiment 1 has been described in detail above as a specific example of the present disclosure, the present disclosure is not limited by this specific description. Modifications, improvements, etc., to the extent that they can achieve the objectives of the present disclosure are included in the present disclosure. For example, the following modifications of the embodiments are also included in the technical scope of the present disclosure.

[0043] (1) The shapes of the first busbar 22 and the second busbar 24 in the above embodiment are merely examples and are not limited to the embodiments described above. For example, the first busbar and the second busbar only need to have a heat dissipation fin portion whose vibration is suppressed by the vibration suppression unit, and the left first heat dissipation fin portion and the right first heat dissipation fin portion are not essential. Also, the vibration suppression unit is not limited to being provided on the upper case, but may be provided on the lower case that constitutes the case. In that case, each heat dissipation fin portion whose vibration is suppressed by the vibration suppression unit on the first busbar and the second busbar may protrude downward from the left-right extension portion or the connection portion. Note that the energizing busbar does not need to be composed of two busbars (first busbar and second busbar), and may be composed of one or three or more busbars. Regardless of the number of busbars that constitute the energizing busbar, the heat dissipation fin portion whose vibration is suppressed by the vibration suppression unit may be provided as one for each busbar, or as two or more for each.

[0044] (2) In the above embodiment, the vibration suppression unit 20 was configured to include four wall portions, each of the first opposing wall portion 56a and each of the second opposing wall portions 56b. However, for example, the first opposing wall portion on the left and the second opposing wall portion on the right may be common, and the vibration suppression unit may be configured to include three wall portions.

[0045] (3) In the above embodiment, each pressure contact rib 58 was provided on the inner surface of each first opposing wall portion 56a and each second opposing wall portion 56b, but these pressure contact ribs are not essential. In that case, the heat dissipation fin portion (for example, the right first heat dissipation fin portion 40 and the right second heat dissipation fin portion 48) may be in zero contact with the inner surface of each opposing wall portion, or they may be facing each other with a small separation distance from the inner surface of each opposing wall portion. Even when pressure contact ribs are provided, the pressure contact ribs are not limited to extending in the vertical direction as in the above embodiment, but may extend in the front-rear direction, for example. [Explanation of symbols]

[0046] 10 Circuit structure 12 Power supply path 14 Power busbars 16 cases 18 Heat dissipation fin section 20 Vibration suppressor 22 First Bus Bar 24 Second Bus Bar 26 Bus Bar 27 Bolt insertion holes 28 Left side connection 30 Right side connection 32 volts 34 bolt insertion holes 36 Lateral extension part 38 Left side, first heat dissipation fin section (heat dissipation fin section) 40 Right side, first heat dissipation fin section (heat dissipation fin section) 42 Connection part 44 bolt insertion holes 46. ​​Left side second heat dissipation fin section (heat dissipation fin section) 48 Right side second heat dissipation fin section (heat dissipation fin section) 50 Upper Case 52 Lower Case 54 Upper bottom wall 56 Opposing wall section 56a 1st opposing wall 56b Second opposing wall section 58 Pressure-welded ribs 60 Bottom wall section 62 Bolt fixing part

Claims

1. The case and, A power busbar is routed within the aforementioned case and constitutes a power supply path, A heat dissipation fin portion is provided protruding from the power supply busbar and extending from the power supply busbar toward the empty space inside the case, The case is provided with a vibration suppression unit that contacts the heat dissipation fins to suppress vibrations of the heat dissipation fins, circuit construct.

2. The circuit configuration according to claim 1, wherein the vibration suppression portion has a pair of opposing wall portions that protrude from the case toward the heat dissipation fin portion and are arranged opposite each other with a gap between them, and the heat dissipation fin portion is inserted between the opposing wall portions.

3. The circuit configuration according to claim 2, wherein at least one of the pair of opposing wall portions is provided with a pressure contact rib that protrudes toward the other side and presses against the heat dissipation fin portion.

4. The energizing busbar comprises a first busbar and a second busbar, which is separate from the first busbar and connected to the first busbar. The circuit configuration according to claim 1 or claim 2, wherein the second busbar has a connecting portion connected to the first busbar and a free end protruding from the connecting portion toward an empty space in the case, and the free end constitutes the heat dissipation fin portion.

5. The circuit configuration according to claim 1 or claim 2, wherein the heat dissipation fin portion is provided protruding from the current-carrying busbar by extending and bending one end of the current-carrying busbar.

6. The circuit configuration according to claim 1 or claim 2, wherein a plurality of heat dissipation fin portions are provided protruding from the power supply busbar, and adjacent heat dissipation fin portions are separated from each other by a gap.

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