JP2021121157A - Circuit structure - Google Patents

Abstract

To disclose a circuit structure in a novel structure, capable of more surely promoting a heat radiation of a heating component in a short heat transmission path, and structuring a heat transmission structure in a less man-hour for assembly.SOLUTION: A circuit structure 10 comprises: a plurality of heating components 16 generating a heat by an electric conduction; a plurality of bus bars 112 and 114 connected to connection parts 30a and 30b of the plurality of heating components 16, respectively; a case 28 housing the plurality of heating components 16 and the plurality of bus bars 112 and 114; a plurality of heat radiation parts 112b and 114b provided to the plurality of bus bars 112 and 114, respectively; and a heat conduction member 118 thermally contacting all of a heat radiation target 120 and the plurality of heat radiation parts 112b and 114b.SELECTED DRAWING: Figure 1

Description

The present disclosure relates to a circuit configuration including heat generating components.

Conventionally, a vehicle is equipped with a circuit configuration including heat generating parts such as a relay. For example, Patent Document 1 discloses a circuit configuration including a relay that interrupts and interrupts the power supply of a battery to a motor or a generator connected via an inverter as a load on the vehicle side.

Since a large current flows through a heat-generating component such as a relay used in such a circuit configuration, Joule heat is generated in proportion to the square of the current amount, and the heat generation amount is also large. Therefore, in Patent Document 1, heat is dissipated from the relay by using the intermediate portion of the bus bar, which is an energizing member that connects the connection portion of the relay housed in the case and the connection terminal of the battery arranged outside the case. The structure has been proposed. Specifically, the heat generated by the relay is generated by contacting the chassis or the housing that houses the entire power supply device with the heat transfer sheet in the middle part of the bus bar that extends outside the case that houses the relay. The structure is disclosed in which heat is conducted to the chassis or housing to dissipate heat.

Japanese Unexamined Patent Publication No. 2014-79093

By the way, it is necessary to secure a large thickness and area of the bus bar constituting the energizing member that connects the relay and the battery so that it can withstand a large current. Therefore, in the structure of Patent Document 1, it is necessary to add a path for heat dissipation by using a large bus bar, and there is a problem that material cost and processing cost increase. In addition, it is necessary to route a large bus bar to other members provided outside the case for heat dissipation for a long time, and it is inevitable that the distance between the relay connection portion and the heat dissipation portion becomes large. Therefore, there is an inherent problem that the heat generated by the relay cannot be dissipated efficiently. Further, it is necessary to bring each intermediate portion of the plurality of bus bars separately connected to the plurality of connection portions provided in the relay into contact with the appropriate position of the chassis or the housing via the heat transfer sheet, and the plurality of heat transfer sheets. It was inevitable that the number of assembly steps would increase due to the work of arranging the chassis and the housing at multiple locations.

Therefore, we disclose a circuit structure with a new structure that can more reliably promote heat dissipation of heat-generating parts with a short heat transfer path and can construct a heat transfer structure with a small number of assembly man-hours.

The circuit configuration of the present disclosure accommodates a plurality of heat-generating components that generate heat when energized, a plurality of bus bars connected to connection portions of the plurality of heat-generating components, and the plurality of heat-generating components and the plurality of bus bars. A circuit configuration including a plurality of heat radiating portions provided on the plurality of bus bars, and a heat conductive member that thermally contacts all of the heat radiating target and the plurality of heat radiating portions.

According to the present disclosure, it is possible to more reliably promote heat dissipation of heat-generating parts with a short heat transfer path, and it is possible to construct a heat transfer structure with a small number of assembly man-hours.

FIG. 1 is a perspective view from the plane side of the circuit configuration according to the first embodiment. FIG. 2 is a perspective view from the back side of the circuit configuration shown in FIG. FIG. 3 is an exploded perspective view of the circuit configuration shown in FIG. FIG. 4 is a vertical cross-sectional view showing a main part in the IV-IV cross section of FIG. FIG. 5 is a diagram schematically showing an electrical configuration in a path from a power supply to a load in the circuit configuration shown in FIG. FIG. 6 is a plan view of the lower case constituting the circuit configuration shown in FIG. FIG. 7 is a plan view of the upper case constituting the circuit configuration shown in FIG. FIG. 8 is a perspective view of the circuit configuration according to the second embodiment. FIG. 9 is an exploded perspective view of the circuit configuration shown in FIG. FIG. 10 is a perspective view of the circuit configuration according to the third embodiment. FIG. 11 is an exploded perspective view of the circuit configuration shown in FIG. FIG. 12 is a perspective view of the circuit configuration according to the fourth embodiment. FIG. 13 is a vertical cross-sectional view showing another aspect of the circuit configuration according to the present disclosure, and is a diagram corresponding to FIG.

<Explanation of Embodiments of the present disclosure>
First, embodiments of the present disclosure will be listed and described.
The circuit configuration of the present disclosure is
(1) A plurality of heat-generating components that generate heat when energized, a plurality of bus bars connected to the connection portions of the plurality of heat-generating components, a case for accommodating the plurality of heat-generating components and the plurality of bus bars, and the plurality of bus bars. It is a circuit configuration including a plurality of heat radiating portions provided on the bus bar, and a heat conductive member housed in the case and in thermal contact with all of the heat radiating target and the plurality of heat radiating portions.

According to the circuit configuration of the present disclosure, a plurality of heat-generating components housed in a case, a plurality of bus bars, and a heat conductive member are included, and the plurality of bus bars connected to each connection portion which is a heat-generating part of the heat-generating component. A heat radiating structure is formed by thermally contacting a heat radiating object with a heat conductive member that is in thermal contact with all of the heat radiating portions provided. Therefore, as compared with the conventional structure in which each intermediate portion of the plurality of bus bars separately connected to the plurality of connection portions provided in the relay is brought into contact with the appropriate position of the chassis or the housing via the heat transfer sheet. In the vicinity of the heat-generating component, the heat-dissipating portion of the bus bar can be brought into contact with the heat-dissipating object via the heat conductive member, and the heat-dissipating of the heat-generating component can be promoted more reliably with a short heat transfer path.

Further, since the heat conductive member is in thermal contact with the heat radiating parts of all the bus bars, the heat radiating parts of a plurality of bus bars are collectively heat-dissipated to the heat radiating target through one heat conductive member. Can be brought into contact with each other. Therefore, compared to the conventional structure that required the work of arranging a plurality of heat transfer sheets at a plurality of locations on the chassis and the housing, the heat transfer structure can be constructed with a small number of assembly man-hours, and the assembly workability can be improved. Can be done. In addition, by collectively contacting the heat radiating parts of a plurality of bus bars with the heat radiating target via one heat conductive member, the heat radiating environment of each bus bar can be approximated, and the temperature control of the heat generating parts can be performed. It may be possible to consolidate sensors and the like.

At least a part of the heat conductive member may be housed in the case. When the entire heat conductive member is housed in the case, the heat conductive member is thermally contacted with the case as a heat dissipation target. Further, a part thereof may be exposed to the outside through a through hole provided in the case. In this case, the heat conductive member is thermally applied to a member such as a housing outside the case as a heat dissipation target. May be in contact with. Further, the heat conductive member may be an insulating member having a higher thermal conductivity than air, and any form such as a sheet-shaped member or a paste-shaped member can be adopted.

Since the bus bar is connected to the connection portion of the heat generating component, the heat of the heat generating component is advantageously transferred. The bus bar connected to the connecting portion of the heat generating component includes both a bus bar used as a conductive member and a bus bar simply used for heat dissipation.

(2) It is preferable that the plurality of heat radiating portions are arranged in parallel and the heat conductive members extend in the parallel direction. By arranging the heat radiating parts in parallel and configuring the heat conductive members that are in thermal contact with them to extend in the parallel direction, it is possible to consolidate the arrangement areas of the heat radiating parts and the heat conductive members, and the heat conductive members and the heat conductive members The compactness of the circuit structure can be advantageously achieved. Further, by configuring the heat conductive members so as to extend in the parallel direction, it is possible to construct the heat conductive members that are in thermal contact with all the heat radiating portions with a simple structure.

(3) It is preferable that the heat conductive member is arranged in the central portion of the case, and the plurality of heat generating parts are dispersedly arranged on one side and the other side sandwiching the heat conductive member. This is because the separation distance between the heat-generating parts can be increased, and the heat effect from the heat-generating parts arranged adjacent to each other can be reduced.

(4) In the above (1) or (2), the heat conductive member is arranged on the peripheral edge portion of the case, and the plurality of heat generating parts are arranged on the central side of the case with respect to the heat conductive member. It is preferable that the connecting portion of each heat generating component is located on the heat conductive member side. Since the connecting portion between the heat conductive member and the heat generating component is arranged on the peripheral edge of the case, it is possible to easily assemble the heat conductive member and connect the external electric wire or the like to the connecting portion of the heat generating component. Is.

(5) It is preferable that the bus bar connected to the connecting portion of the heat generating component includes a conducting bus bar and a heat radiating bus bar having the heat radiating portion. By dividing the bus bar connected to the connection part of the heat generating component into two bus bars, a conduction bus bar and a heat dissipation bus bar, the heat conduction member of the bus bar is not affected by the configuration required for energization. This is because it is possible to form a heat radiating portion that makes thermal contact, and it is possible to improve the degree of design freedom.

(6) In the above (5), the conduction bus bar is arranged on the peripheral edge portion of the case, and the heat radiating portion of the heat radiating bus bar is arranged at a portion different from the peripheral edge portion of the case. Is preferable. This is because the connection work of the external electric wire or the like to the conduction bus bar can be easily performed by arranging the conduction bus bar connected to the connecting portion of the heat generating component to the peripheral portion of the case. In addition, by providing the heat dissipation part of the heat dissipation bus bar in a part using an empty space in the case different from the peripheral part where the conduction bus bar is arranged, it is possible to construct a heat transfer structure more space-efficiently. Because it becomes.

<Details of Embodiments of the present disclosure>
Specific examples of the circuit configuration of the present disclosure will be described below with reference to the drawings. It should be noted that the present disclosure is not limited to these examples, and is indicated by the scope of claims, and is intended to include all modifications within the meaning and scope equivalent to the scope of claims.

<Embodiment 1>
Hereinafter, the first embodiment of the present disclosure will be described with reference to FIGS. 1 to 7. The circuit configuration 10 is mounted on a vehicle (not shown) such as an electric vehicle or a hybrid vehicle, and supplies and controls electric power from a power source 12 such as a battery to a load 14 such as a motor (see FIG. 5). The orientation of the circuit configuration 10 when mounted on the vehicle is not limited, but in the following description, the upward direction is the Z direction in FIG. 1, and the front direction is the X direction and the left direction in FIG. Will be described as the Y direction in FIG. Further, for a plurality of the same members, a reference numeral may be added to only a part of the members, and the reference numeral may be omitted for the other members.

<Rough circuit configuration of circuit configuration 10>
As shown in FIG. 5, the circuit configuration 10 includes a circuit configuration 10a provided on the positive electrode side and a circuit configuration 10b provided on the negative electrode side. The positive electrode side of the power supply 12 is connected to the input side of the circuit configuration 10a, and the negative electrode side of the power supply 12 is connected to the input side of the circuit configuration 10b. The positive electrode side of the load 14 is connected to the output side of the circuit configuration 10a, and the negative electrode side of the load 14 is connected to the output side of the circuit configuration 10b. A relay 16 which is a heat generating component for connecting the power supply 12 to the load 14 is connected between the input side and the output side of the circuit structure 10a and the circuit structure 10b, respectively. In addition, a precharge circuit 22 in which the precharge resistor 18 and the precharge relay 20 are connected in series so as to bypass the relay 16 is connected to the relay 16 that connects the power supply 12 and the positive electrode side of the load 14. ..

In the first embodiment of the present disclosure, as shown in FIG. 5, the precharge resistor 18 is connected to the input side of the precharge relay 20. The precharge circuit 22 is similarly connected to the relay 16 connecting the power supply 12 and the negative electrode side of the load 14, but in FIG. 5, the precharge circuit 22 is connected to the relay 16 connecting the power supply 12 and the negative electrode side of the load 14. The charge circuit 22 is shown by a chain double-dashed line. Further, both the relay 16 and the precharge relay 20 are relays that move the contact portion to switch the contact portion ON / OFF while the exciting coil is energized, and ON / OFF control is performed by a control circuit (not shown). .. As described above, the circuit structure 10a and the circuit structure 10b have substantially the same structure.

<Circuit configuration 10>
As shown in FIG. 3, for example, the circuit configuration 10 includes a lower case 24 located below and an upper case 26 located above when mounted on a vehicle. The lower case 24 and the upper case 26 constitute an insulating base member 28. A low-voltage bus bar (not shown) for connecting the relay 16 and the precharge circuit 22 or the inside of the precharge circuit 22 is housed inside the base member 28. Further, the base member 28 is provided with two relays 16 and conduction bus bars 32 and 34 as bus bars connected to the connection portions 30a and 30b of the respective relays 16. A larger current flows through these conduction bus bars 32 and 34 as compared with the low-voltage bus bars for the precharge circuit 22. The shape of the low-pressure bus bar is not limited, and can be appropriately set according to the arrangement of parts to which the low-pressure bus bar is connected.

<Lower case 24>
The lower case 24 is formed by injection molding an insulating synthetic resin into a predetermined shape. The synthetic resin constituting the lower case 24 may contain a filler such as glass fiber, and for example, a material exhibiting good thermal conductivity can be preferably adopted. As shown in FIG. 6, the lower case 24 of the first embodiment has a substantially rectangular shape in a plan view as a whole and has a flat shape.

A plurality of lower side engaging portions 42 are provided on the outer peripheral surface of the lower case 24. The lower side engaging portion 42 engages with the upper side engaging portion 64 provided on the outer peripheral surface of the upper case 26, which will be described later, so that the lower case 24 and the upper case 26 are mutually fixed. .. The engagement mode between the lower side engaging portion 42 and the upper side engaging portion 64 is not limited, and for example, uneven fitting or the like can be adopted. Further, on the outer peripheral surface of the lower case 24, a notch-shaped recess 44 is provided at a position corresponding to the fastening portion 66 provided in the upper case 26, which will be described later, so that the fastening portion 66 is located in the recess 44. It has become.

On the upper surface of the lower case 24, a mounting surface 46 on which the heat conductive sheet 118 as a heat conductive member described later is mounted is provided. In the first embodiment, the mounting surface 46 is a flat surface, and is provided on the left peripheral edge portion of the lower case 24 over a substantially overall length in the front-rear direction. In particular, the mounting surface 46 is provided with ribs 48 that cover the periphery of the heat conductive sheet 118, and the ribs 48 allow the heat conductive sheet 118 to be mounted without being substantially displaced. In the first embodiment, the rib 48 is partially provided around the heat conductive sheet 118 in the circumferential direction. As shown in FIG. 2, another heat conductive sheet 118 is also placed on the lower surface of the lower peripheral portion on the left side of the lower case 24 at a position substantially equal to that of the heat conductive sheet 118 mounted on the mounting surface 46. Is provided.

Further, a substantially square cylinder-shaped relay fixing portion 50 projecting upward is provided on a portion of the lower case 24 to the right of the mounting surface 46, and a nut 52 is fixed to the upper end of the relay fixing portion 50. Has been done. As a result, the leg portions 100 of the relays 16 and 16, which will be described later, are bolted to the relay fixing portion 50. A recessed groove for arranging a low-voltage bus bar for the precharge circuit 22 may be provided in a portion of the lower case 24 on the right side of the mounting surface 46. The concave groove for arranging such a low-pressure bus bar can be appropriately set according to the shape of the bus bar and the like.

<Upper case 26>
The upper case 26 is formed by injection molding an insulating synthetic resin into a predetermined shape. The synthetic resin constituting the upper case 26 may contain a filler such as glass fiber. As shown in FIG. 7, the upper case 26 has a substantially box-like shape that opens downward as a whole, and has an upper wall 54 having substantially the same shape as the lower case 24, and the upper wall 54. A peripheral wall 56 that projects downward from the outer peripheral edge portion is provided. Further, at the lower end of the peripheral wall 56, an upper side engaging portion 64 is provided at a position corresponding to the lower side engaging portion 42 in the lower case 24.

Further, at the lower end of the peripheral wall 56 of the upper case 26, a fastening portion 66 having a bolt insertion hole penetrating in the vertical direction is provided at a position where the engaging portion 64 on the upper side is disengaged in the circumferential direction. The fastening portion 66 is a substantially cylindrical member that is separate from the upper case 26. The fastening portion 66 is fixed to the upper case 26 by fitting a portion having a small diameter in the vertical intermediate portion of the fastening portion 66 into the notch-shaped recess 68 provided in the upper case 26.

Further, the upper case 26 is formed with a relay accommodating portion 70 accommodating the relay 16 having a substantially rectangular concave shape that opens upward. In the first embodiment, the relay accommodating portion 70 accommodating the relay 16 on the positive electrode side and the relay accommodating portion 70 accommodating the relay 16 on the negative electrode side are each formed in the central portion in the left-right direction. That is, both relay accommodating portions 70, 70 are provided at substantially equal positions in the left-right direction and separated from each other in the front-rear direction. The bottom surface of the relay accommodating portion 70 is a substantially flat surface extending on a horizontal plane (XY plane), and is provided at a position lower than the upper wall 54. The relays 16 and 16 are accommodated with respect to these relay accommodating portions 70 and 70 so that the connecting portions 30a and 30b of the relay 16 face to the left, respectively. In the upper case 26, an insertion hole 72 that penetrates the upper wall 54 in the thickness direction (vertical direction) is formed at a position corresponding to the relay fixing portion 50 of the lower case 24.

To the left of each relay accommodating portion 70, bus bar accommodating portions 74, 76 in which conduction bus bars 32, 34 are accommodated are provided. These bus bar accommodating portions 74 and 76 are formed at substantially equal positions in the left-right direction, respectively, and a total of four bus bar accommodating portions 74 and 76 are provided on the left peripheral edge portion of the upper case 26. That is, the four bus bar accommodating portions 74 and 76 are provided in parallel in the front-rear direction on the left peripheral edge portion of the upper case 26.

The bus bar accommodating portions 74 and 76 each have a substantially rectangular concave shape that opens upward, and the internal space of the relay accommodating portion 70 and the internal space of the bus bar accommodating portions 74 and 76 communicate with each other. Further, between the bus bar accommodating portions 74 and 76, a partition wall portion 78 is provided on the peripheral wall 56 of the upper case 26 so as to project from a portion facing the relay 16 in the left-right direction toward the relay 16. As a result, both bus bar accommodating portions 74 and 76 are partitioned from each other, and an electrical short circuit caused by the conduction bus bars 32 and 34 coming into contact with each other is prevented. In particular, a concave groove 80 into which the partition plate portion 98 of the relay 16 described later is inserted is formed at the protruding tip of the partition wall portion 78.

The bottom surface of the bus bar accommodating portions 74 and 76 is a substantially rectangular flat surface extending on a horizontal plane. The bottom surface of the relay accommodating portion 70 and the bottom surfaces of the bus bar accommodating portions 74 and 76 are separated from each other in the left-right direction. As a result, a substantially rectangular opening window 82 in a plan view is formed between the bottom surface of the relay accommodating portion 70 and the bottom surface of the bus bar accommodating portions 74 and 76 in the vertical direction through the upper wall 54. There is. Further, a nut accommodating portion 84 that opens upward is formed on the bottom surface of the bus bar accommodating portions 74 and 76, and the nut 86 is accommodated in the nut accommodating portion 84. The nut 86 can be fitted into the nut accommodating portion 84 and fixed by, for example, uneven fitting.

Further, on the upper wall 54 of the upper case 26, a precharge resistor mounting portion 88 for mounting the precharge resistor 18 and a precharge relay mounting portion 90 for mounting the precharge relay 20 are opened upward. It is provided. Furthermore, the upper wall 54 is provided with a connector mounting portion 94 for mounting the connector 92.

<Relay 16>
The relay 16 is a mechanical relay, and ON / OFF control is performed by a control circuit (not shown). As shown in FIG. 3, the relay 16 includes a relay main body 96 having a substantially hollow rectangular parallelepiped shape as a whole, and has a contact portion and a coil portion (not shown) inside the relay main body 96. .. A pair of through holes are formed on the left end surface of the relay body 96 so as to be separated from each other in the front-rear direction, and these through holes form the connection portions 30a and 30b of the relay 16 described above. That is, the connection portions 30a and 30b are provided on the left side of each relay 16.

When energized, a current flows between the connection portions 30a and 30b via the contact portion of the relay 16, so that heat is generated at the contact portion. A partition plate portion 98 projecting to the left is formed between the connection portions 30a and 30b over substantially the entire length of the relay main body 96 in the vertical direction. As a result, an electrical short circuit due to contact between the conductive bus bar 32 connected to the + side connecting portion 30a and the conductive bus bar 34 connected to the − side connecting portion 30b is prevented from occurring.

The relay main body 96 is provided with a plurality of (three in this embodiment) leg portions 100 protruding from both sides in the front-rear direction, and the leg portions 100 are formed with bolt insertion holes. The relay is relayed by inserting the fixing bolt 102 in a state where the insertion hole 72 in the upper case 26 and the bolt insertion hole of the leg 100 are aligned and fastening the fixing bolt 102 to the nut 52 provided in the relay fixing portion 50 of the lower case 24. 16 is attached to the base member 28.

<Continuity bus bars 32, 34>
The pair of conductive bus bars 32 and 34 are formed by processing a metal plate material, each of which has conductivity. As shown in FIG. 3, each of the conduction bus bars 32 and 34 is formed by bending into a substantially L shape. One side with respect to the bent portion is a substantially rectangular plate-shaped first connecting portion 32a, 34a that extends in the vertical direction and is connected to the connecting portions 30a, 30b of the relay 16. The first connecting portions 32a and 34a have bolt insertion holes 104 penetrating in the left-right direction, which is the plate thickness direction. The conduction bus bars 32 and 34 are at least electrically connected to the connection portions 30a and 30b of the relay 16 by fastening the bolts 106 to the connection portions 30a and 30b of the relay 16. ing.

Further, in each of the conduction bus bars 32 and 34, the other side with respect to the bent portion extends to the left, and the extending portion is the second connecting portion 32b and 34b. The second connecting portions 32b and 34b have a substantially rectangular plate shape, and have a bolt insertion hole 108 penetrating in the vertical direction, which is the plate thickness direction. These bolt insertion holes 108 are aligned with the nut 86 provided in the nut accommodating portion 84 when the conduction bus bars 32 and 34 are placed on the bottom surface of the bus bar accommodating portion 74. Then, the terminal portions at the end of the electric wire (not shown) are overlapped with the second connecting portions 32b and 34b of the bus bars 32 and 34 for conduction, and the bolt 110 is inserted into the bolt insertion hole 108 and fastened to the nut 86 to connect with the electric wire. The conduction bus bars 32 and 34 are electrically connected.

<Bathbars for heat dissipation 112, 114>
As shown in FIG. 4 and the like, not only the conduction bus bars 32 and 34 but also the heat dissipation bus bars 112 and 114 as the bus bars are connected to the connection portions 30a and 30b of the relay 16 which is a heat generating component. As a result, the heat dissipation bus bars 112 and 114 are at least thermally connected to the connection portions 30a and 30b of the relay 16.

The pair of heat-dissipating bus bars 112 and 114 are formed by processing a metal plate material, each of which has heat transfer properties. Like the conduction bus bars 32 and 34, the heat dissipation bus bars 112 and 114 are formed by bending into a substantially L shape. One side with respect to the bent portion is a substantially rectangular first plate-shaped portion 112a, 114a that extends in the vertical direction and is connected to the connecting portions 30a, 30b of the relay 16. The first plate-shaped portions 112a and 114a have bolt insertion holes 116 penetrating in the left-right direction, which is the plate thickness direction.

Further, in each of the heat radiating bus bars 112 and 114, the other side with respect to the bent portion extends to the left. The extending portion is a substantially rectangular second plate-shaped portion 112b, 114b.

<Heat conduction sheet 118>
Heat conductive sheets 118 as substantially rectangular heat conductive members are provided on both the upper and lower surfaces of the lower peripheral portion on the left side of the lower case 24. The heat conductive sheet 118 is made of a synthetic resin having elasticity having a higher thermal conductivity than air. The heat conductive sheet 118 has flexibility and elasticity, and can be elastically deformed so that the thickness dimension changes according to the force applied in the vertical direction. In the first embodiment, the heat conductive sheet 118 is adopted as the heat conductive member, but the heat conductive member of any form can be adopted without being limited to this. For example, a silicone-based resin, a non-silicone-based acrylic resin, a ceramic-based resin, or the like can be used. More specifically, for example, a heat dissipation gap filler, a heat conductive grease, a heat conductive silicone rubber, and the like made of a silicone-based resin can be mentioned.

The heat conductive sheet 118 provided on the upper surface of the lower case 24 is attached to the second plate-shaped portions 112b and 114b of the heat radiating bus bars 112 and 114 and the left peripheral portion on the left side of the lower case 24 when the upper case 26 and the lower case 24 are assembled. On the other hand, they are overlapped in the vertical direction and sandwiched. Further, the heat conductive sheet 118 provided on the lower surface of the lower case 24 is a peripheral portion on the left side of the lower case 24 and the housing 120 when the circuit configuration 10 is attached to the housing 120 of the battery pack as a heat dissipation target described later. It is overlapped and sandwiched in the vertical direction. The heat conductive sheet 118 may be fixed to the second plate-shaped portions 112b, 114b and / or the upper surface (mounting surface 46) of the lower case 24, the lower surface of the lower case 24 and / or the housing 120 by adhesion or the like. However, it may be provided in a fixed state in a non-adhesive state.

<Assembly process of circuit configuration 10>
Subsequently, an example of the assembly process of the circuit configuration 10 will be described. The assembly process of the circuit configuration 10 is not limited to the following description.

First, the lower case 24 and the upper case 26 that form the base member 28 are prepared. Next, a bus bar that connects the relay 16 and the precharge circuit 22 and a bus bar that connects the inside of the precharge circuit 22 are accommodated and arranged with respect to the lower case 24 or the upper case 26. Subsequently, the heat conductive sheet 118 is placed on the mounting surface 46 of the lower case 24, and the second plate-shaped portions 112b, 114b of the heat radiating bus bars 112, 114 are placed on the heat conductive sheet 118 so as to overlap each other. .. Then, the upper case 26 to which the fastening portion 66 is assembled is superposed on the lower case 24 from above, and the lower side engaging portion 42 and the upper side engaging portion 64 are engaged with each other. As a result, the lower case 24 and the upper case 26 are assembled to form the base member 28. As a result, the second plate-shaped portions 112b and 114b of the heat radiating bus bars 112 and 114 are located on the left peripheral edge portion of the base member 28. However, the fastening portion 66 may be assembled to the upper case 26 after the lower case 24 and the upper case 26 are assembled.

At that time, the first plate-shaped portions 112a and 114a of the heat radiating bus bars 112 and 114 project upward from the upper case 26 through the opening window 82 provided in the upper case 26. It is preferable that the heat conductive sheet 118 sandwiched between the heat radiating bus bars 112 and 114 and the lower case 24 in the base member 28 is slightly compressed in the vertical direction. As a result, not only the misalignment of the heat conductive sheet 118 can be prevented, but also the heat transfer bus bars 112 and 114 and the heat conductive sheet 118 can be brought into contact with each other more reliably to improve the heat transfer property. The vertical holding force of the heat conductive sheet 118 is secured by engaging the lower side engaging portion 42 and the upper side engaging portion 64 at a plurality of locations. However, for example, by fixing the upper case 26 and the lower case 24 with bolts or the like in place of or in addition to the engagement between the lower side engaging portion 42 and the upper side engaging portion 64, the heat conductive sheet 118 The holding force in the vertical direction may be improved.

Then, the relay 16 is arranged in the relay accommodating portion 70 of the upper case 26, and the relay 16 is fixed to the base member 28 by the fixing bolt 102. Subsequently, the conduction bus bars 32 and 34 and the heat dissipation bus bars 112 and 114 are connected to the two relays 16, respectively.

That is, by arranging the relay 16 in the relay accommodating portion 70 of the upper case 26, the bolt insertion holes provided in the connection portions 30a and 30b of the relay 16 and the first plate-shaped portions 112a and 114a of the heat dissipation bus bars 112 and 114. 116, 116 are aligned with each other. Further, the conduction bus bars 32, 34 are arranged in the bus bar accommodating portions 74, 76 of the upper case 26, and the first connecting portions 32a, 34a of the conduction bus bars 32, 34 and the first plate shape of the heat dissipation bus bars 112, 114 are arranged. The portions 112a and 114a are overlapped in the left-right direction. As a result, the bolt insertion holes 104, 104 and the bolt insertion holes 116, 116 are aligned with each other.

Next, the bolts 106 and 106 are inserted into the connecting portions 30a and 30b, the bolt insertion holes 104 and 104, and the bolt insertion holes 116 and 116 and fastened. As a result, the conduction bus bars 32 and 34 and the heat dissipation bus bars 112 and 114 are bolted to the connection portions 30a and 30b of the relay 16. In other words, the heat dissipation bus bars 112 and 114 are co-tightened by using the bolts 106 and 106 that fix the conduction bus bars 32 and 34 to the relay 16. That is, in the first embodiment, the case accommodating the plurality of relays 16 and the plurality of bus bars (conduction bus bars 32, 34 and heat dissipation bus bars 112, 114) is composed of the base member 28 including the lower case 24 and the upper case 26. Has been done. In the first embodiment, the conduction bus bars 32 and 34 and the heat dissipation bus bars 112 and 114 are in electrical and thermal contact with the connection portions 30a and 30b of the relay 16.

The circuit configuration 10 is assembled by the above steps. The terminal portions at the ends of the electric wires are overlapped with the second connecting portions 32b and 34b of the conduction bus bars 32 and 34, and the bolt 110 is fastened to power the relay 16 via the conduction bus bars 32 and 34. Can be supplied. Further, the precharge resistor 18, the precharge relay 20, and the connector 92 are attached to the base member 28 in a timely manner.

Then, for example, with the heat conductive sheet 118 fixed to the lower surface of the circuit configuration 10 (lower surface of the lower case 24), a mounting bolt (not shown) is inserted into the bolt insertion hole of the fastening portion 66 to form the battery pack housing 120. By fastening, the circuit configuration 10 can be attached to the housing 120. As a result, the heat conductive sheet 118 is superposed on the circuit structure 10 (lower case 24) and the housing 120, and is in thermal contact with each other. In particular, in the first embodiment, fastening portions 66 are provided at five locations around the peripheral portion on the left side where the heat conductive sheet 118 is provided in the lower case 24, and the circuit configuration 10 is attached to the housing 120 in the fastening portion 66. It is fixed. As a result, the contact state between the heat conductive sheet 118 and the lower case 24 and the housing 120 can be stably maintained. The heat conductive sheet 118 is preferably in a state of being slightly compressed between the lower case 24 and the housing 120 in the vertical direction. As a result, not only the positional deviation of the heat conductive sheet 118 can be prevented, but also the contact state between the heat conductive sheet 118 and the lower case 24 and the housing 120 can be maintained more stably.

In the circuit configuration 10 of the first embodiment having the above structure, the contact portion inside the relay 16 generates heat when power is supplied to the relay 16, and this heat is used for heat dissipation connected to the relay 16. It extends to bus bars 112 and 114. Here, the heat radiating bus bars 112 and 114 are in thermal contact with the heat conductive sheet 118 at the second plate-shaped portions 112b and 114b. As a result, the heat generated by the relay 16 is dissipated to the lower case 24 through the heat conductive sheet 118 on the lower case 24. Further, the heat conducted to the lower case 24 is dissipated to the housing 120 via the heat conductive sheet 118 under the lower case 24. As a result, the heat radiating portions (second plate-shaped portions 112b and 114b) can be provided relatively close to the relay 16, and the heat generated by the relay 16 is generated by the lower case 24 and the housing 120 via the heat conductive sheet 118. It is possible to dissipate heat quickly.

That is, in the first embodiment, the heat radiating portion that thermally contacts the heat radiating object via the heat conductive member is composed of the second plate-shaped portions 112b and 114b of the heat radiating bus bars 112 and 114. Further, in the first embodiment, the heat dissipation target is composed of the lower case 24 and the housing 120. Here, the heat-dissipating object refers to a member or a portion where heat generated by the heat-generating component is conducted by thermally contacting the heat-generating component to reduce or eliminate the heat generation of the heat-generating component. In the first embodiment, it is composed of the lower case 24 and the housing 120, but the present invention is not limited to this, and may be, for example, a chassis or the like.

In the first embodiment, two relays 16 and 16 are provided, and a total of four heat radiating bus bars 112 and 114 are in contact with one heat conductive sheet 118 on the lower case 24. Therefore, as compared with the case where a separate heat conductive sheet is provided for each heat dissipation bus bar, for example, the assembly man-hours can be reduced and the assembly workability can be improved. Further, since all the heat radiating parts (second plate-shaped parts 112b and 114b) are in contact with the same heat conductive sheet 118, the heat radiating from each heat radiating part can be made substantially equal, for example, a temperature sensor. It is also possible to easily control the temperature of the relay 16 using the above. That is, in the first embodiment, for example, the thermistor 122, which is a sensor for temperature control, may be arranged between the relays 16 and 16 in the base member 28 in the front-rear direction.

In particular, in the first embodiment, four heat radiating portions (second plate-shaped portions 112b and 114b of the heat radiating bus bars 112 and 114) are arranged in parallel in the front-rear direction at substantially equal positions in the left-right direction. The heat conductive sheet 118 in contact with these heat radiating portions (second plate-shaped portions 112b and 114b) also extends substantially straight in the front-rear direction (parallel direction of the heat radiating portions). As a result, the heat-dissipating portion (second plate-shaped portions 112b, 114b) and the arrangement region of the heat-conducting sheet 118 can be reduced while simplifying the shape of the heat-conducting sheet 118. Miniaturization can also be achieved.

Further, in the circuit configuration 10 according to the first embodiment, the second connecting portions 32b and 34b of the conduction bus bars 32 and 34 to which the external electric wires are connected are located on the left peripheral edge portion of the base member 28. , Can be easily connected to an external electric wire. Furthermore, in the circuit configuration 10 in the first embodiment, the width dimension in the left-right direction can be made smaller than that in the circuit configuration 130 in the second embodiment described later, for example.

Further, in the first embodiment, the bus bar connected to the connection portions 30a and 30b of the relay 16 includes the conduction bus bars 32 and 34 and the heat dissipation bus bars 112 and 114. As a result, the conduction bus bars 32 and 34 and the heat dissipation bus bars 112 and 114 can be formed separately, so that, for example, the materials and shapes can be different from each other, and the degree of freedom in design can be improved. .. Further, the conduction bus bar 32 (34) and the heat dissipation bus bar 112 (114) can be fixed together with one bolt 106 to the connection portion 30a (30b) of the relay 16, for example, separately fixed. The production efficiency can be improved as compared with the case of the above.

<Embodiment 2>
Next, the second embodiment of the present disclosure will be described with reference to FIGS. 8 and 9. The circuit configuration 130 shown in FIG. 8 has the same configuration as the circuit configuration 10 of the first embodiment as a whole, but the positions and orientations of the components are different. Specifically, the structure is such that the rear portion of the circuit configuration 10 of the first embodiment is flipped horizontally and connected to the front portion. In the following description, the differences from the circuit configuration 10 of the first embodiment will be described, and the description of the portion having the same structure will be omitted. Further, in the following description, the members or parts substantially the same as those in the first embodiment are designated by the same reference numerals as those in the first embodiment, and detailed description thereof will be omitted.

As shown in FIG. 9 and the like, in the second embodiment, the base member 28 has a shape that bends like a crank in a plan view. That is, the base member 28 has a central portion 132 extending in the front-rear direction in the central portion in the left-right direction, a right protruding portion 134 protruding to the right from the central portion 132, and a left protruding portion protruding to the left from the central portion 132. It is equipped with 136. The two relays 16 and 16 are provided on the right protruding portion 134 and the left protruding portion 136 of the base member 28, respectively, and the connecting portions 30a and 30b are located on the inward side in the left-right direction. As a result, the second plate-shaped portions 112b and 114b of the heat radiating bus bars 112 and 114 connected to the connecting portions 30a and 30b extend inward in the left-right direction from the relays 16 and 16. As a result, the second plate-shaped portions 112b and 114b of the heat radiating bus bars 112 and 114, which are heat radiating portions, are located at the central portions 132 of the base member 28, respectively. Therefore, also in the second embodiment, the four heat radiating portions (second plate-shaped portions 112b and 114b) are arranged in parallel in the front-rear direction.

Then, one heat conductive sheet 118 mounted on the mounting surface 46 of the lower case 24 is superposed on the lower surfaces of the heat radiating portions (second plate-shaped portions 112b, 114b). Further, on the lower surface of the lower case 24, another heat conductive sheet 118 is superposed and fixed, for example, at substantially the same position as the heat conductive sheet 118 mounted on the mounting surface 46. These heat conductive sheets 118 and 118 are formed in a size that allows them to come into contact with the heat radiating portions (second plate-shaped portions 112b and 114b), and extend substantially straight in the front-rear direction.

The circuit configuration 130 in the second embodiment having the above-described structure can also exhibit the same effect as the circuit configuration 10 in the first embodiment. In particular, in the circuit configuration 130 according to the second embodiment, the heat conductive sheet 118 is arranged in the central portion 132 of the base member 28, and the relays 16 are dispersed one by one on the right side and one on the left side with the heat conductive sheet 118 interposed therebetween. Is arranged. As a result, the facing distance between the relays 16 and 16 can be secured to some extent, and the mutual thermal influence of the heat generated by the relays 16 and 16 can be reduced.

<Embodiment 3>
Next, the third embodiment of the present disclosure will be described with reference to FIGS. 10 and 11. The circuit configuration 140 shown in FIG. 10 has the same configuration as the circuit configuration 10 of the first embodiment as a whole, but the positions and orientations of the components are different. In the following description, the differences from the circuit configuration 10 of the first embodiment will be described, and the description of the portion having the same structure will be omitted.

That is, as shown in FIG. 11 and the like, in the third embodiment, the two relays 16 and 16 are both provided in the central portion in the left-right direction of the base member 28. The connection portions 30a and 30b of the front relay 16 are located on the right side, and the connection portions 30a and 30b of the rear relay 16 are located on the left side. As a result, the second connection portions 32b, 34b of the conduction bus bars 32, 34 connected to the connection portions 30a, 30b extend to the right side, which is outward in the left-right direction in the front relay 16, and the peripheral portion of the base member 28. Has been routed to. Further, also in the rear relay 16, the second connecting portions 32b, 34b of the conduction bus bars 32, 34 extend to the left side, which is outward in the left-right direction, and are arranged on the peripheral portion of the base member 28.

Here, in the third embodiment, the second plate-shaped portions 112b and 114b of the heat radiating bus bars 112 and 114 extend in a direction different from that of the second connecting portions 32b and 34b of the conduction bus bars 32 and 34. Specifically, in the third embodiment, the second plate-shaped portions 112b and 114b of the heat dissipation bus bars 112 and 114 extend in the direction opposite to the second connection portions 32b and 34b of the conduction bus bars 32 and 34. , Each extends inward in the left-right direction. That is, in the front relay 16, the second plate-shaped portions 112b and 114b extend to the left and are located at the central portion in the left-right direction of the base member 28. Further, in the rear relay 16, the second plate-shaped portions 112b and 114b extend to the right and are located at the central portion in the left-right direction of the base member 28. These four heat radiating portions (second plate-shaped portions 112b and 114b) are arranged in parallel in the front-rear direction at the central portion in the left-right direction of the base member 28.

Then, one heat conductive sheet 118 mounted on the mounting surface 46 of the lower case 24 is superposed on the lower surfaces of the heat radiating portions (second plate-shaped portions 112b, 114b). Further, on the lower surface of the lower case 24, another heat conductive sheet 118 is superposed and fixed, for example, at substantially the same position as the heat conductive sheet 118 mounted on the mounting surface 46. These heat conductive sheets 118 and 118 are formed in a size that allows them to come into contact with the heat radiating portions (second plate-shaped portions 112b and 114b), and extend in the front-rear direction as a whole.

The circuit configuration 140 in the third embodiment having the above-described structure can also exhibit the same effect as the circuit configuration 10 in the first embodiment. Also in the circuit configuration 140 according to the third embodiment, since the second connection portions 32b and 34b of the conduction bus bars 32 and 34 to which the external electric wires are connected are arranged on the peripheral portion of the base member 28, they are external. Can be easily connected to the electric wire. In particular, in the third embodiment, the peripheral wall 56 of the upper case 26 is not provided outside the second connecting portions 32b and 34b in the left-right direction, so that the connection with the external electric wire can be made easier.

Further, in the third embodiment, the heat radiating portions (second plate-shaped portions 112b, 114b) extend inward in the left-right direction and are located at the central portion in the left-right direction of the base member 28, but the present invention is limited to this embodiment. It can be appropriately designed according to the shape of the base member 28 and the like. For example, as shown by the alternate long and short dash line in FIG. 11, each heat radiating portion (second plate-shaped portion 112b, 114b) may extend forward, and the heat conductive sheet 118 and the peripheral portion on the front side of the base member 28 Thermal contact may be made. Alternatively, in the first embodiment, the heat radiating portions (second plate-shaped portions 112b, 114b) may extend to the right, for example, and thermally with the heat conductive sheet 118 at the peripheral portion on the right side of the base member 28. You may make contact. That is, when the heat radiating portion is arranged at a portion different from the conduction bus bar arranged on the peripheral portion of the case, the arrangement position of the radiating portion is limited to the central portion in the left-right direction and the front-rear direction of the case. Instead, it may be provided on the peripheral portion of the case at a portion different from the portion where the conduction bus bar is arranged. The shape of the heat conductive sheet 118 can be appropriately changed according to the positions of the heat radiating portions (second plate-shaped portions 112b, 114b) and the like, and the empty space in the base member 28 can be effectively used. Therefore, as in the present embodiment, for example, the second connecting portions 32b and 34b are externally provided while the heat radiating portions (second plate-shaped portions 112b and 114b) are provided in an empty space where the heat conductive sheet 118 is allowed to be arranged. It is also possible to provide it on the peripheral portion of the base member 28 which can be easily connected to the electric wire of the above, and the degree of freedom in design is improved.

<Embodiment 4>
Next, the fourth embodiment of the present disclosure will be described with reference to FIG. The circuit configuration 150 shown in FIG. 12 has the same configuration as the circuit configuration 10 of the first embodiment as a whole, but the positions and orientations of the components are different. Specifically, in the circuit configuration 130 of the second embodiment, the precharge resistor 18 and the precharge relay 20 provided on the right side of the front relay 16 are provided on the left side of the conduction bus bars 32 and 34. There is. Further, the precharge resistor 18 and the connector 92 provided on the left side of the rear relay 16 are provided on the right side of the conduction bus bars 32 and 34. The circuit configuration 150 of the fourth embodiment is different from the circuit configuration 130 of the second embodiment only in the positions of the precharge resistor 18, the precharge relay 20, and the connector 92. Therefore, since the heat radiating portions (second plate-shaped portions 112b and 114b) and the heat conductive sheet 118 are located at the central portion in the left-right direction of the base member 28 as in the second embodiment, the illustration is omitted.

The same effect as that of the first embodiment can be exhibited in the circuit configuration 150 having the above structure.

<Other Embodiments>
The techniques described herein are not limited to the embodiments described above and in the drawings, and for example, the following embodiments are also included in the technical scope of the techniques described herein.

(1) In the above embodiment, the heat conductive sheets 118 and 118 are provided on both the upper and lower surfaces of the lower case 24, but as in the circuit configuration 160 shown in FIG. 13, there is only one heat conductive sheet 162. May be good. In that case, through the through window 164 provided in the lower case 24, the heat conductive sheet 162 is applied to the heat radiating portion (second plate-shaped portions 112b, 114b of the heat radiating bus bars 112, 114) and the housing 120 to be radiated. It may be in contact.

(2) In each of the above-described embodiments, the front portion and the rear portion of the circuit configurations 10, 130, 140, and 150 have substantially the same shape. For example, in the second and fourth embodiments, they are connected in a state of being inverted in the left-right direction. Or, in the first embodiment, they are connected in a state of being arranged side by side in the front-rear direction. However, the front portion and the rear portion of the circuit configuration may have different shapes from each other. That is, for example, the front portion and the rear portion in different embodiments may be used in combination.

(3) In each of the above-described embodiments, the connection portions 30a and 30b of the two relays 16 and 16 are provided on the outer side and the inner side of the two relays 16 and 16, respectively. It may be provided on the side or the rear side. In short, the directions in which the connecting portions are provided in the two relays may be orthogonal to each other.

(4) In each of the above-described embodiments, the bus bars connected to the connection portions 30a and 30b of the relay 16 are configured to include the conduction bus bars 32 and 34 and the heat dissipation bus bars 112 and 114 which are separated from each other. However, it is not limited to such an aspect. That is, the same bus bar may be adopted as the bus bar for conduction and the bus bar for heat dissipation, and the structure may have both a connecting portion with an external electric wire and a heat radiating portion.

(5) In each of the above-described embodiments, the heat conductive sheet 118 provided on the upper surface of the lower case 24 and the heat conductive sheet 118 provided on the lower surface substantially overlap with each other in the vertical projection view, but the present invention is limited to this embodiment. For example, at least a part of them may overlap.

(6) In the present disclosure, the heat generating component is not limited to the relay, and may be, for example, a fuse or the like. Further, the number of heat generating parts is not limited to two, and may be three or more.

(7) In each of the above embodiments, an example in which a heat conductive sheet is used as the heat conductive member has been described, but the present invention is not limited to this, and a heat conductive member having a conventional form such as a paste other than the sheet can be used. Is.

10, 10a, 10b Circuit structure 12 Power supply 14 Load 16 Relay (heat generating component)
18 Precharge resistor 20 Precharge relay 22 Precharge circuit 24 Lower case (heat dissipation target)
26 Upper case 28 Base member (case)
30a, 30b Connections 32,34 Conduction bus bar (bus bar)
32a, 34a 1st connection 32b, 34b 2nd connection 42 Lower side engaging 44 Recess 46 Mounting surface 48 Rib 50 Relay fixing 52 Nut 54 Upper wall 56 Peripheral wall 64 Upper side engaging 66 Fastening 68 Recess 70 Relay accommodating part 72 Insertion hole 74,76 Busbar accommodating part 78 Partition wall part 80 Concave groove 82 Opening window 84 Nut accommodating part 86 Nut 88 Precharge resistance mounting part 90 Precharge relay mounting part 92 Connector 94 Connector mounting part 96 Relay body 98 Partition plate 100 Leg 102 Fixing bolt 104 Bolt insertion hole 106 Bolt 108 Bolt insertion hole 110 Bolt 112, 114 Heat dissipation bus bar 112a, 114a First plate-shaped part 112b, 114b Second plate-shaped part (heat dissipation part)
116 Bolt insertion hole 118 Heat conduction sheet (heat conduction member)
120 housing (for heat dissipation)
122 Thermistor 130 Circuit configuration 132 Central portion 134 Right protruding portion 136 Left protruding portion 140 Circuit configuration 150 Circuit configuration 160 Circuit configuration 162 Heat conduction sheet 164 Through window

Claims (6)

Multiple heat-generating parts that generate heat when energized,
A plurality of bus bars connected to the connection portions of the plurality of heat generating parts, and
A case for accommodating the plurality of heat generating parts and the plurality of bus bars, and
A plurality of heat radiating parts provided on the plurality of bus bars, respectively,
A heat conductive member that is in thermal contact with the heat radiating object and all of the plurality of heat radiating parts,
A circuit configuration that includes. The circuit configuration according to claim 1, wherein the plurality of heat radiating portions are arranged in parallel, and the heat conductive member extends in the parallel direction. According to claim 1 or 2, the heat conductive member is arranged in the central portion of the case, and the plurality of heat generating parts are dispersedly arranged on one side and the other side sandwiching the heat conductive member. The circuit configuration described. The heat conductive member is arranged on the peripheral edge of the case, the plurality of heat generating parts are arranged on the center side of the case with respect to the heat conductive member, and the connecting portion of each heat generating component is on the heat conductive member side. The circuit configuration according to claim 1 or 2, which is located in. The circuit according to any one of claims 1 to 4, wherein the bus bar connected to the connection portion of the heat generating component includes a conduction bus bar and a heat radiating bus bar having the heat radiating portion. Constituent. The circuit configuration according to claim 5, wherein the conduction bus bar is arranged on a peripheral portion of the case, and the heat radiating portion of the heat radiating bus bar is arranged at a portion different from the peripheral portion of the case. ..

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