Circuit unit in on-vehicle component

Abstract

To disclose a circuit unit in an on-vehicle component in which a structure for connecting an external connection part and a connector can be simplified and connection workability can be improved.SOLUTION: A circuit unit 10 in an on-vehicle component includes a circuit constituting member 16, a case 18, a connection bus bar 30 including an inner connection part 22 and an external connection part 28, a first window part 110 included in the case 18 so as to face the inner connection part 22 and a first bolt insertion hole 152, and a second wind part 112 included in the case 18 so as to face the external connection part 28 and a second bolt insertion hole 156. The first bolt insertion hole 152 and the second bolt insertion hole 156 are disposed so as to have sizes including tolerance absorbing gaps 154, 158. The connection bus bar 30 is housed in a displaceable manner in a tolerance absorbing direction with respect to the case 18. The first window part 110 is open in such a way that a bolt fastening work can be performed through the first window part 110. The second window part 112 is open in such a way that a bolt fastening work can be performed through the second window part 112.SELECTED DRAWING: Figure 8

Description

Technical Field

[0001] The present invention relates to an in-vehicle component internal circuit unit.

Background Art

[0002] Patent Document 1 discloses a structure in which a circuit unit such as a junction box is housed together with a battery module, a battery control system, etc. in a housing of a battery pack which is an in-vehicle component mounted on a vehicle. Here, in order to enable connection with an external device of the circuit unit housed in the housing of the battery pack, a connector to which an external mating connector is connected is provided on the peripheral wall of the housing, and a structure is adopted in which the connector and the circuit unit are conductively connected by a relay component such as a covered wire or a bus bar.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the structure of Patent Document 1, since relay components such as covered wires and bus bars are required to connect between the connector provided on the housing and the external connection portion provided on the circuit unit housed in the housing, there is an inherent problem that the number of parts is large and the handleability is poor. In addition, when the circuit unit is a junction box or the like housed in a housing of a high-voltage component such as a battery pack as in Patent Document 1, since the relay component and the external connection portion of the circuit unit become live parts, it is also necessary to take separate electric shock countermeasures. As a result, the structure for connecting the external connection portion of the in-vehicle component internal circuit unit to the connector provided on the housing of the in-vehicle component becomes complicated, and it is inevitable that the workability is reduced.

[0005] Therefore, there is disclosed an in-vehicle component internal circuit unit capable of simplifying the connection structure between the external connection portion of the in-vehicle component internal circuit unit and the connector provided in the housing of the in-vehicle component and improving the connection workability.

Means for Solving the Problems

[0006] The in-vehicle component internal circuit unit of the present disclosure is an in-vehicle component internal circuit unit housed in a housing of an in-vehicle component, and includes a circuit component member, an insulating case that houses the circuit component member, an internal connection portion that is housed in the case and is conductively connected to a circuit-side connection portion provided on the circuit component member, and an external connection portion that is conductively connected to a connector-side connection portion of a connector provided on the housing. The connection bus bar has a first window portion provided on the case and disposed opposite to the internal connection portion of the connection bus bar and a first bolt insertion hole provided in the internal connection portion, and a second window portion provided on the case and disposed opposite to the external connection portion of the connection bus bar and a second bolt insertion hole provided in the external connection portion. The first bolt insertion hole and the second bolt insertion hole are provided with a size including a tolerance absorption gap extending in the tolerance absorption direction, the connection bus bar is housed so as to be displaceable in the tolerance absorption direction with respect to the case, the first window portion is opened with a size that enables bolt fastening work from the outside of the case to the circuit-side connection portion of the internal connection portion through the first window portion, and the second window portion is opened with a size that enables bolt fastening work from the outside of the case to the connector-side connection portion of the external connection portion through the second window portion.

Advantages of the Invention

[0007] According to the present disclosure, it is possible to provide an in-vehicle component internal circuit unit capable of simplifying the connection structure between the external connection portion of the in-vehicle component internal circuit unit and the connector provided in the housing of the in-vehicle component and improving the connection workability.

Brief Description of the Drawings

[0008]

Figure 1

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Mode for Carrying Out the Invention

[0009] <Description of Embodiments of the Present Disclosure> First, embodiments of the present disclosure will be listed and described. The in-vehicle component internal circuit unit of the present disclosure is (1) An in-vehicle component internal circuit unit housed in a housing of an in-vehicle component, comprising a circuit component, an insulating case for housing the circuit component, an internal connection portion housed in the case and conductively connected to a circuit-side connection portion provided on the circuit component, and an external connection portion conductively connected to a connector-side connection portion of a connector provided on the housing. A connection bus bar having the above, a first window portion provided in the case and disposed opposite to the internal connection portion of the connection bus bar and a first bolt insertion hole provided in the internal connection portion, and a second window portion provided in the case and disposed opposite to the external connection portion of the connection bus bar and a second bolt insertion hole provided in the external connection portion. The first bolt insertion hole and the second bolt insertion hole are provided with a size including a tolerance absorption gap extending in the tolerance absorption direction, the connection bus bar is accommodated in the case so as to be displaceable in the tolerance absorption direction, the first window portion is opened with a size that enables bolt fastening work from the outside of the case to the circuit-side connection portion of the internal connection portion through the first window portion, and the second window portion is opened with a size that enables bolt fastening work from the outside of the case to the connector-side connection portion of the external connection portion through the second window portion.

[0010] According to the in-vehicle component internal circuit unit of this aspect, a connection bus bar that electrically connects the circuit-side connection part and the connector-side connection part is accommodated in the case in a state where it can be displaced in the tolerance absorption direction. Further, the internal connection part and the external connection part of the connection bus bar accommodated in the case can be bolted to the circuit-side connection part and the connector-side connection part from the outside via the first window part and the second window part provided in the case. Therefore, the circuit unit is arranged in the housing of the in-vehicle component, the connection bus bar is displaced in the tolerance absorption direction to absorb the tolerance, and the internal connection part and the external connection part of the connection bus bar are aligned with the circuit-side connection part and the connector-side connection part respectively, and can be bolted from the outside. As a result, relay components such as coated electric wires and bus bars that connect between the connector provided in the housing, which was necessary in the past, and the external connection part provided in the circuit unit housed in the housing are no longer required, and the connection structure between the in-vehicle component internal circuit unit and the connector provided in the housing of the in-vehicle component can be simplified. Moreover, since the connection bus bar is accommodated in the case, measures against electric shock can also be advantageously realized using the case. Further, since the first and second window parts provided in the case only need to be opened in a size that allows the bolt fastening operation of each connection part from the outside, the parts that can become live parts can be covered by the case as much as possible, and the connection workability can also be improved.

[0011] Note that the tolerance absorption direction can be set in the required direction, and it may be one direction or a plurality of directions. Also, the first / second window parts only need to be opened in a size that allows the bolt fastening operation of each connection part from the outside of the case. When bolts and nuts are not built into the case, it should be a size that allows them to be inserted. When bolts and nuts are built into the case, it only needs to be a size that allows the fastening tool to be inserted while preventing the bolts and nuts from detaching from the window part.

[0012] (2) Preferably, the first window portion and the second window portion are each surrounded by a cylindrical portion protruding outward from the case. Since the first window portion and the second window portion are surrounded by the cylindrical portions protruding outward from the case, by adjusting the protruding height of the cylindrical portions, it is possible to advantageously suppress the contact of the operator with the internal connection portion and the external connection portion that can become live portions.

[0013] (3) Preferably, a bolt or a nut is accommodated inside each of the cylindrical portions of the first window portion and the second window portion, and a retaining projection protruding radially inward is provided on the protruding tip side of the cylindrical portion. By abutting against the retaining projection, the separation of the bolt or the nut from the cylindrical portion is prevented. By using the internal space of each of the cylindrical portions of the first window portion and the second window portion, bolts or nuts for bolt fastening to the internal connection portion of the connection bus bar, the circuit side connection portion of the external connection portion, and the connector side connection portion can be pre-built into the case, and further improvement in workability can be achieved. Further, since bolts or nuts are pre-accommodated in each of the cylindrical portions of the first window portion and the second window portion, the size of the openings of the first window portion and the second window portion can be reduced to a size that does not allow the insertion of bolts or nuts but allows the insertion of fastening tools, and further improvement in electric shock prevention measures can be achieved. In particular, by applying an insulation treatment to the exposed portions of the built-in bolts and nuts from the window portions, the electric shock prevention measures can be further strengthened.

[0014] (4) Each of the bolts or nuts accommodated in the respective cylindrical portions has an insulation treatment portion, and the insulation treatment portion of the bolt or the nut can protrude from the cylindrical portion to the outside in a non-fastened state and is accommodated in the cylindrical portion in a fastened state, which is preferable. Since each bolt or nut accommodated in each cylindrical portion has an insulation treatment portion, electric shock through a fastening tool during the fastening operation is prevented. In particular, when the insulation treatment portion protrudes from the cylindrical portion to the outside in the non-fastened state of the bolt or nut, it is easy to visually confirm that it is in the non-fastened state, and the fastening operation can also be easily performed. Moreover, since the protruding portion is the insulation treatment portion, countermeasures against electric shock can also be maintained. Further, in the fastened state, since the insulation treatment portion is accommodated in the cylindrical portion, it is easy to confirm from the outside that it is in the fastened state. Furthermore, even in a finished product in which the fastening is completed, the protruding height of the cylindrical portion to the outside of the case can be suppressed to be small, and miniaturization of the in-vehicle component internal circuit unit can also be achieved.

[0015] (5) The case has a case body having a mounting portion on which the connection bus bar is mounted, and a cover portion assembled to cover the mounting portion and displaceable with respect to the case body in the tolerance absorption direction, and the cover portion has the first window portion and the second window portion and displaces in the tolerance absorption direction together with the connection bus bar, which is preferable. The case is divided into a case body having a mounting portion on which the connection bus bar is mounted and a cover portion assembled to cover the mounting portion and displaceable with respect to the case body in the tolerance absorption direction. Since the cover portion displaces together with the connection bus bar, a structure for accommodating the connection bus bar displaceable in the tolerance absorption direction with respect to the case can be provided simply and surely. Moreover, since a cover portion which is a part of the case displaces together with the connection bus bar, the opening sizes of the first window portion and the second window portion can be made smaller compared with the case where only the connection bus bar displaces with respect to the case, and safer electric shock countermeasures can be taken.

[0016] (6) The case body has fitting holes extending in the tolerance absorption direction around the placement portion, and the cover portion has fitting protrusions protruding from the peripheral edge portion of the cover portion toward the case body and fitting into the fitting holes. It is preferable that the width dimension of the fitting protrusions in the tolerance absorption direction is smaller than that of the fitting holes. By making the width dimension of the fitting protrusions of the cover portion that fit into the fitting holes provided in the case body smaller than the width dimension of the fitting holes in the tolerance absorption direction, the fitting protrusions can be displaced in the tolerance absorption direction within the fitting holes. As a result, the cover portion having the fitting protrusions can be displaced in the tolerance absorption direction with respect to the case body, and by using the fitting protrusions and fitting holes for assembling the cover portion to the case body, the moving end of the cover portion (connection bus bar) with respect to the case body in the tolerance absorption direction can be defined.

[0017] (7) It is preferable that the fitting protrusions have locking claws provided at the protruding end portions and protruding toward the placement portion side from the fitting holes, and the locking claws inserted into the fitting holes engage with the edge portions on the placement portion side of the fitting holes. Since the locking claws protrude toward the placement portion side from the fitting holes and engage with the edge portions on the placement portion side of the fitting holes, it is difficult to insert a tool such as a driver into the fitting holes so as to bend the fitting protrusions in the direction in which the engagement between the locking claws and the case body is released, and the engagement between the locking claws and the case body is stably maintained. Also, the engagement portion between the locking claws and the case body cannot be visually recognized from the outside, and the release of the engagement between the locking claws and the case body can be more reliably prevented. As a result, the cover portion can be held in a snap-fitted state with respect to the case body. As a result, the risk that an operator accidentally removes the cover portion from the case and gets an electric shock during maintenance can be suppressed.

[0018] (8) The internal connection part and the external connection part extend in a direction in which they intersect with each other, and the first bolt insertion hole provided in the internal connection part and the second bolt insertion hole provided in the external connection part penetrate in a direction in which they intersect with each other. It is preferable that the tolerance absorption direction in the tolerance absorption gap of the first bolt insertion hole and the tolerance absorption direction in the tolerance absorption gap of the second bolt insertion hole are in directions orthogonal to each other. Since the internal connection part and the external connection part extend in a direction in which they intersect with each other, the first bolt insertion hole and the second bolt insertion hole provided in the internal connection part and the external connection part are provided so as to intersect with each other. Therefore, the tolerance absorption direction in the tolerance absorption gap of the first bolt insertion hole and the tolerance absorption direction in the tolerance absorption gap of the second bolt insertion hole can be set in directions orthogonal to each other, and the connection bus bar can be displaced with respect to the case in at least two directions orthogonal to each other. As a result, the circuit component electrically connected to the internal connection part and the connector electrically connected to the external connection part can be stably connected by the connection bus bar. For example, if the tolerance absorption directions in the tolerance absorption gaps of the first bolt insertion holes are two directions orthogonal to each other (for example, the front-rear and left-right directions), and the tolerance absorption direction in the tolerance absorption gap of the second bolt insertion hole includes a direction orthogonal to them (for example, the up-down direction), the connection bus bar can be displaced with respect to the case in the up-down, left-right, and front-rear directions, and the circuit component and the connector can be more reliably connected via the connection bus bar.

[0019] (9) Preferably, the cover portion has ribs protruding toward the placement portion, and in a state where the cover portion is assembled to the case body, the ribs are in contact with or opposed to the connection bus bar. A rib protruding toward the placement portion side provided on the cover portion is in contact with the connection bus bar or opposed to it with a slight gap in a state where the cover portion is assembled to the case body. Thereby, when the connection bus bar tends to lift or displace from the placement portion of the case body, the rib suppresses the lifting of the connection bus bar. Therefore, rattling of the connection bus bar in the case is avoided. In particular, when the connection bus bar is connected to a heat generating component such as a relay via, for example, a circuit component, the circuit component may have a heat radiating portion that contacts the heat transfer surface provided on the case body. In such a case, by providing a rib on the cover portion to prevent the connection bus bar from lifting, it is possible to prevent not only the connection bus bar but also the circuit component provided with the heat radiating portion from lifting, and advantageously prevent the heat radiating portion from lifting from the heat transfer surface toward the cover portion side. Thereby, heat dissipation of the heat generating component via the connection bus bar can be stably maintained.

[0020] (10) Preferably, the connection bus bar has a first end portion provided with the internal connection portion and a second end portion provided with the external connection portion and protruding upward from the first end portion, the internal connection portion includes the first bolt insertion hole having the tolerance absorption gap in an extending direction of the first end portion, and the external connection portion includes the second bolt insertion hole having the tolerance absorption gap in an extending direction of the second end portion. A second end portion provided with an external connection portion protrudes upward from a first end portion provided with an internal connection portion of the connection bus bar, and in mutually different extending directions of the first end portion and the second end portion, the first bolt insertion hole and the second bolt insertion hole have tolerance absorption gaps. Thereby, it becomes possible to set the tolerance absorption direction in a plurality of directions, and the workability of assembling the in-vehicle component internal circuit unit to the in-vehicle component can be further improved. In particular, since the second end portion protrudes upward from the first end portion, it is also possible to provide a space for accommodating components such as a wire harness in the space between them.

[0021] (11) Preferably, the connection bus bar is a laminate of a plurality of thin plates. Since the connection bus bar is a laminate of a plurality of thin plates, the connection bus bar can be flexibly deformed. Thereby, for example, even when the length dimension of the connection bus bar is short and the deformation rigidity is large in a single flat bus bar, it is possible to absorb the tolerance by deforming the connection bus bar, and the circuit side connection provided on the circuit component The portion and the connector side connection portion provided on the connector can be more reliably connected.

[0022] <Details of Embodiments of the Present Disclosure> A specific example of the in-vehicle component internal circuit unit 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 shown by the claims, and is intended to include all modifications within the meaning and scope equivalent to the claims.

[0023] <Embodiment 1> Hereinafter, Embodiment 1 of the present disclosure will be described with reference to FIGS. 1 to 16. The in-vehicle component internal circuit unit 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 such as a battery (not shown) to a load such as a motor (not shown). In FIGS. 1 and the like, a state is shown in which the in-vehicle component internal circuit unit 10 is housed in a housing 14 of a battery pack 12 as an in-vehicle component and fastened by first and second bolts 138 and 140 described later. These in-vehicle component internal circuit units 10 and in-vehicle components (battery pack 12 (housing 14)) are not shown in their entirety, but the main parts are extracted and shown. The in-vehicle component internal circuit unit 10 can be arranged in an arbitrary orientation. In the following description, the upper side refers to the upper side in FIG. 8, the lower side refers to the lower side in FIG. 8, the front refers to the right side in FIG. 5, the rear refers to the left side in FIG. 5, the left side refers to the lower side in FIG. 5, and the right side refers to the upper side in FIG. 5. Further, for a plurality of identical members, only some members may be assigned reference numerals, and reference numerals may be omitted for other members.

[0024] <In-vehicle component internal circuit unit 10> The in-vehicle component internal circuit unit 10 is housed within the housing 14 of an in-vehicle component (battery pack 12), and includes a circuit component 16 and an insulating case 18 that houses the circuit component 16. The case 18 contains a connection bus bar 30 (first connection bus bar 30a and second connection bus bar 30b) having an internal connection part 22 (first internal connection part 22a and second internal connection part 22b) conductively connected to a circuit-side connection part 20 (first circuit-side connection part 20a and second circuit-side connection part 20b) provided on the circuit component 16, and an external connection part 28 (first external connection part 28a and second external connection part 28b) conductively connected to a connector-side connection part 26 (first connector-side connection part 26a and second connector-side connection part 26b) of a connector 24 provided on the housing 14.

[0025] <Battery pack 12> The in-vehicle component in which the in-vehicle component internal circuit unit 10 is housed is not limited, but in this embodiment, the in-vehicle component is a battery pack 12. As shown in FIG. 2, the housing 14 of the battery pack 12 includes a housing main body 32 and a lid 34. The housing main body 32 is, for example, a substantially box-shaped that opens upward, and includes a bottom wall 36 and a peripheral wall part 38 that projects upward from the outer peripheral edge of the bottom wall 36. In FIG. 2 and the like, the main part of the battery pack 12 (housing 14) is shown extracted, and only the rear wall part 40 is shown as the peripheral wall part 38, but wall parts constituting the peripheral wall part 38 may be provided in front of and on both the left and right sides of the bottom wall 36.

[0026] On the rear wall portion 40, there is provided a connector insertion hole 42 for inserting the connector-side connection portions 26 (each connector-side connection portion 26a, 26b) of the connector 24 into the housing 14. Through this connector insertion hole 42, the connector-side connection portions 26 (each connector-side connection portion 26a, 26b) are inserted into the housing main body 32, and the connector 24 is fastened to the housing main body 32 with bolts 44, so that the connector 24 is attached to the housing 14. Then, after placing the in-vehicle component internal circuit unit 10 in the housing main body 32 and electrically connecting it to the connector 24, the upper opening of the housing main body 32 is covered and fixed with a lid 34 having a substantially flat plate shape, so that the in-vehicle component internal circuit unit 10 is housed in the housing 14.

[0027] <Connector 24> The shape of the connector 24 is not limited, but in this embodiment, it includes a pair of electric wires 46, 46. Each electric wire 46 is a coated electric wire and has a core wire 48 and an insulating coating 50 externally inserted on the core wire 48. At the end (front end) of each electric wire 46, the insulating coating 50 is peeled off and the core wire 48 is exposed. The core wire 48 exposed by peeling off the insulating coating 50 is electrically connected to a connector terminal 54 in a connector housing 52 made of a synthetic resin or the like having insulating properties. That is, the connector 24 is provided with a pair of connector terminals 54, 54 by providing connector terminals 54 at the ends of the respective electric wires 46, and these pair of connector terminals 54, 54 are arranged side by side in the left-right direction.

[0028] Each connector terminal 54 is provided with a bolt fastening hole at the front end. In this embodiment, the first and second connector-side connection portions 26a, 26b are constituted by these bolt fastening holes. In short, at the external connection portions 28 (the first and second external connection portions 28a, 28b) of the connection bus bar 30 in the in-vehicle component internal circuit unit 10, by inserting the second bolts 140, 140 described later and fastening them to the bolt fastening holes (the first and second connector-side connection portions 26a, 26b) of the connector terminals 54, 54 in the connector 24, the connection bus bar 30 in the in-vehicle component internal circuit unit 10 and the connector 24 are conductively connected.

[0029] Note that the connector housing 52 is fixed to the housing main body 32 via an attachment portion 56 having a predetermined thickness dimension. That is, the attachment portion 56 is provided with insertion holes through which the respective connector-side connection portions 26a, 26b and bolts 44, 44 in the connector 24 are inserted. And in a state where the connector 24 is fixed to the housing main body 32 by bolts 44, the respective connector-side connection portions 26a, 26b penetrate the attachment portion 56 and are exposed into the housing main body 32 through the connector insertion holes 42 in the rear wall portion 40.

[0030] <Circuit component 16> In the present embodiment, as also shown in FIGS. 3 and 4, the circuit component 16 includes a pair of relays (a first relay 58a and a second relay 58b) and bus bars for conduction (first to fourth bus bars for conduction 62a to 62d) connected to a pair of connection portions 60, 60 provided on each of the relays 58a, 58b. In the present embodiment, the first relay 58a and the second relay 58b are arranged opposite to each other, the first relay 58a on the left side is arranged facing backward, and the second relay 58b on the right side is arranged facing forward.

[0031] And the first bus bar for conduction 62a is connected to the left connection portion 60 of the first relay 58a, and this first bus bar for conduction 62a is electrically connected to an external circuit (not shown) on the left side of the in-vehicle component internal circuit unit 10. Also, a second bus bar for conduction 62b is connected to the right connection portion 60 of the first relay 58a. At the end of the second bus bar for conduction 62b on the side opposite to the side connected to the first relay 58a, it protrudes upward beyond the first relay 58a via a heat dissipation portion 64 (second heat dissipation portion 64b) described later below, and constitutes a first circuit-side connection portion 20a. In particular, the first circuit-side connection portion 20a is constituted by a bolt insertion hole penetrating in the plate thickness direction (vertical direction) provided at the end of the second bus bar for conduction 62b on the side opposite to the side connected to the first relay 58a.

[0032] Furthermore, a third conduction bus bar 62c is connected to the left connection part 60 of the second relay 58b. At the third conduction bus bar 62c, the end on the side opposite to the side connected to the second relay 58b protrudes upward beyond the second relay 58b via a heat dissipation part 64 (third heat dissipation part 64c) described below, and constitutes the second circuit side connection part 20b. In particular, at the third conduction bus bar 62c, the second circuit side connection part 20b is constituted by a bolt insertion hole penetrating in the plate thickness direction (vertical direction) provided at the end on the side opposite to the side connected to the second relay 58b. Furthermore, a fourth conduction bus bar 62d is connected to the right connection part 60 of the second relay 58b, and this fourth conduction bus bar 62d is electrically connected to an external circuit (not shown) on the right side of the in-vehicle component internal circuit unit 10.

[0033] Each conduction bus bar 62 (first to fourth conduction bus bars 62a to 62d) is constituted by a metal plate material having conductivity, and is formed by being bent into a predetermined shape by press working or the like. These first to fourth conduction bus bars 62a to 62d each have a portion that spreads in the horizontal direction (direction orthogonal to the vertical direction) below, and these portions that spread in the horizontal direction below are heat dissipation parts 64 (first to fourth heat dissipation parts 64a to 64d). As will be described later, the first and second connection bus bars 30a and 30b are connected to the second and third conduction bus bars 62b and 62c. Therefore, the first and second connection bus bars 30a and 30b indirectly have the heat dissipation parts 64 (second and third heat dissipation parts 64b and 64c) via the second and third conduction bus bars 62b and 62c.

[0034] <Case 18> The case 18 has a case main body 68 having a mounting part 66 on which the connection bus bar 30 is mounted, and a cover part 70 that covers the mounting part 66 and is assembled to the case main body 68.

[0035] <Case main body 68> The case body 68 has an upper case 72 and a lower case 74 that are assembled in the vertical direction. These upper case 72 and lower case 74 are each box-shaped and open downward and upward, respectively, and are formed of, for example, a rigid synthetic resin or the like. That is, the upper case 72 has an upper wall 76 that is generally rectangular as a whole, and an upper peripheral wall 78 that projects downward from the outer peripheral edge of the upper wall 76. Further, a rear end wall portion 79 that projects upward is provided at the right side portion of the rear end portion of the upper wall 76. In FIGS. 3, 4, etc., the main parts of the in-vehicle component internal circuit unit 10 are extracted and shown, and only the front upper wall 80 and the rear upper wall 82 are shown as the upper peripheral wall 78, but wall portions constituting the upper peripheral wall 78 may be provided on both the left and right sides of the upper wall 76.

[0036] As also shown in FIG. 7, the upper wall 76 is provided with a substantially rectangular through window 84 that penetrates in the plate thickness direction (vertical direction). In the present embodiment, through windows 84 (first through window 84a and second through window 84b) are provided at two locations on the upper wall 76. These first through window 84a and second through window 84b are provided at positions corresponding to the first circuit side connection portion 20a in the second conduction bus bar 62b and the second circuit side connection portion 20b in the third conduction bus bar 62c, respectively. Specifically, the first through window 84a is provided at a substantially central portion of the upper wall 76, and the second through window 84b is provided at the right rear portion of the upper wall 76. Thereby, in a state where the circuit component 16 is accommodated in the case body 68, the first circuit side connection portion 20a and the second circuit side connection portion 20b are exposed to the outside through the first through window 84a and the second through window 84b.

[0037] Then, as will be described later, connection bus bars 30 (first connection bus bar 30a and second connection bus bar 30b) are superposed from above on first circuit-side connection portions 20a and second circuit-side connection portions 20b exposed from first through-window 84a and second through-window 84b. In the upper wall 76, a region where the first connection bus bar 30a and the second connection bus bar 30b are superposed and placed is a placement portion 66. In the present embodiment, the placement portion 66 is configured to include a region on the upper wall 76 from the first through-window 84a to the second through-window 84b, for example, a region from the rear portion of the first through-window 84a to the left portion of the second through-window 84b.

[0038] Further, fitting holes 86 penetrating the upper wall 76 in the plate thickness direction are provided around the placement portion 66. These fitting holes 86 are adapted to fit with fitting protrusions 132 (to be described later) provided on the cover portion 70. In the present embodiment, a plurality of fitting holes 86 are provided. Three fitting holes 86 are provided around the first through-window 84a, and one fitting hole 86 is provided around the second through-window 84b. Each fitting hole 86 has a substantially rectangular shape extending in the front-rear direction, which is one of the tolerance absorption directions (to be described later), and the opening width dimension b (see FIG. 7) in the front-rear direction is larger than the opening width dimension a (see FIG. 7) in the left-right direction.

[0039] The lower case 74 has a substantially rectangular lower wall 88 as a whole and a lower peripheral wall 90 protruding upward from the outer peripheral edge portion of the lower wall 88. In FIGS. 3, 4, etc., the main part of the in-vehicle component internal circuit unit 10 is extracted and shown, and only the lower front wall 92 and the lower rear wall 94 are shown as the lower peripheral wall 90, but wall portions constituting the lower peripheral wall 90 may be provided on both the left and right sides of the lower wall 88.

[0040] As also shown in FIGS. 3 and 4, the lower wall 88 is provided with a substantially rectangular columnar bus bar fixing portion 96 protruding upward. In the present embodiment, bus bar fixing portions 96 (a first bus bar fixing portion 96a and a second bus bar fixing portion 96b) are provided at two locations on the lower wall 88. These first bus bar fixing portion 96a and second bus bar fixing portion 96b are respectively provided at positions corresponding to a first circuit side connection portion 20a in the second conduction bus bar 62b and a second circuit side connection portion 20b in the third conduction bus bar 62c. Specifically, the first bus bar fixing portion 96a is provided at a substantially central portion of the lower wall 88, and the second bus bar fixing portion 96b is provided at a rear right portion of the lower wall 88. Nuts 98 are provided in a buried state at the upper end portions of these first and second bus bar fixing portions 96a, 96b.

[0041] And in a state where the circuit component 16 is accommodated in the case main body 68, each heat radiation portion 64 (first to fourth heat radiation portions 64a to 64d) in each conduction bus bar 62 (first to fourth conduction bus bars 62a to 62d) is superposed on the lower wall 88 in the lower case 74. Substantially sheet-like heat transfer sheets 100 made of a material having relatively good heat transfer efficiency are respectively provided between these heat radiation portions 64a to 64d and the lower wall 88, and each heat radiation portion 64a to 64d is in contact with the lower wall 88 via each heat transfer sheet 100. Further, as will be described later, the lower wall 88 in the case main body 68 is superposed on the bottom wall 36 in the housing 14 of the battery pack 12. Gap fillers 102 made of a material having relatively good heat transfer efficiency are respectively provided at positions corresponding to the heat transfer sheets 100 between the lower wall 88 and the bottom wall 36, and the lower wall 88 is in contact with the bottom wall 36 via each gap filler 102. That is, the heat generated with the energization of each relay 58a, 58b is radiated from the bottom wall 36 via each heat radiation portion 64a to 64d, each heat transfer sheet 100, the lower wall 88, and each gap filler 102. Therefore, in the present embodiment, a heat transfer surface 104 that is provided on the case main body 68, contacts each heat radiation portion 64a to 64d, and transfers the heat generated with the energization of each relay 58a, 58b is constituted by the upper surface of the lower wall 88.

[0042] The materials of these heat transfer sheets 100 and gap fillers 102 are not limited as long as they have insulation properties, and may be composed of, for example, synthetic resins with a higher thermal conductivity than air. Specifically, silicone-based resins, non-silicone-based acrylic resins, ceramic-based resins, etc. can be used. More specifically, for example, heat dissipation sheets, heat dissipation gap fillers, thermal conduction greases, thermally conductive silicone rubbers, etc. made of silicone-based resins can be mentioned. Note that the heat transfer member provided between each of the heat dissipation portions 64a to 64d and the lower wall 88 is not limited to a sheet shape, and a conventionally known heat transfer member can be adopted. Also, in FIGS. 3 and 4, the gap filler 102 is shown in a substantially rectangular block shape, but the shape of the gap filler 102 is not limited, and a conventionally known gap filler (heat transfer member) can be adopted.

[0043] In particular, these heat transfer sheets 100 and gap fillers 102 can be elastically deformed in the thickness direction (vertical direction), and by elastically deforming these heat transfer sheets 100 and gap fillers 102 in the vertical direction, during the bolt fastening operation of each of the second bolts 140 between each of the external connection portions 28a, 28b and each of the connector-side connection portions 26a, 26b, the vertical tolerance between the in-vehicle component internal circuit unit 10 and the housing 14 of the battery pack 12 can be absorbed.

[0044] <Cover portion 70> The cover portion 70 has a shape that covers the placement portion 66 in the case body 68, and has a shape that extends from the first through window 84a to the second through window 84b in the upper case 72. That is, as also shown in FIGS. 11 and 12, the cover portion 70 has a horizontal wall portion 106 that extends in the left-right direction and spreads in a substantially horizontal direction (a direction perpendicular to the vertical direction). Also, a vertical wall portion 108 that protrudes upward and spreads in the vertical direction is provided at the right side portion at the rear end of the horizontal wall portion 106. Thereby, the cover portion 70 has a substantially L-shaped vertical cross section at the right side portion.

[0045] Further, in the horizontal wall portion 106 of the cover portion 70, in a state where it is assembled to the case main body 68, a first window portion 110 penetrating in the plate thickness direction (vertical direction) is provided at a position corresponding to the through window 84 and the circuit side connection portion 20 exposed from the through window 84. In the present embodiment, in the horizontal wall portion 106, a left first window portion 110a and a right first window portion 110b are provided at positions corresponding to the first and second circuit side connection portions 20a and 20b, respectively. Further, in the vertical wall portion 108, in a state where the in-vehicle component internal circuit unit 10 is housed in the housing 14 of the battery pack 12, a second window portion 112 penetrating in the plate thickness direction (front-rear direction) is provided at a position corresponding to the connector side connection portion 26. In the present embodiment, in the vertical wall portion 108, a left second window portion 112a and a right second window portion 112b are provided at positions corresponding to the first and second connector side connection portions 26a and 26b, respectively.

[0046] As will be described later, since the first and second circuit side connection portions 20a and 20b are overlapped and conductively connected to the internal connection portions 22 (first and second internal connection portions 22a and 22b) of the respective connection bus bars 30a and 30b, the left and right first window portions 110a and 110b are provided at positions corresponding to the first and second internal connection portions 22a and 22b. That is, in the assembled state of the in-vehicle component internal circuit unit 10, the left and right first window portions 110a and 110b are arranged to face each other in the vertical direction with respect to each internal connection portion 22a and 22b and the first bolt insertion holes 152 provided in each internal connection portion 22a and 22b. Further, since the first and second connector side connection portions 26a and 26b are overlapped and conductively connected to the external connection portions 28 (first and second external connection portions 28a and 28b) of the respective connection bus bars 30a and 30b, the left and right second window portions 112a and 112b are provided at positions corresponding to the first and second external connection portions 28a and 28b. That is, in the assembled state of the in-vehicle component internal circuit unit 10, the left and right second window portions 112a and 112b are arranged to face each other in the front-rear direction with respect to each external connection portion 28a and 28b and the second bolt insertion holes 156 provided in each external connection portion 28a and 28b.

[0047] In the present embodiment, the left and right first window portions 110a and 110b and the second window portions 112a and 112b are each formed in the same shape and are formed as circular through-holes having a predetermined inner diameter dimension φA (see FIG. 8). The inner diameter dimension φA of these left and right first window portions 110a and 110b only needs to be large enough for a tool for the bolt fastening operation by each of the first bolts 138, which will be described later, between each of the internal connection portions 22a and 22b and each of the circuit-side connection portions 20a and 20b, to be inserted from at least the outside of the case 18. In the present embodiment, the inner diameter dimension φA of the left and right first window portions 110a and 110b is made larger than the maximum outer diameter dimension φC (see FIG. 14) of the head portion 144 including the insulation treatment portion 146 of each of the first bolts 138, which will be described later. Similarly, the inner diameter dimension φA of the left and right second window portions 112a and 112b only needs to be large enough for a tool for the bolt fastening operation by each of the second bolts 140, which will be described later, between each of the external connection portions 28a and 28b and each of the connector-side connection portions 26a and 26b, to be inserted from at least the outside of the case 18. In the present embodiment, the inner diameter dimension φA of the left and right second window portions 112a and 112b is made larger than the maximum outer diameter dimension φC of the head portion 144 including the insulation treatment portion 146 of each of the second bolts 140, which will be described later.

[0048] Also, in the horizontal wall portion 106, first cylindrical portions 114 and 114, which are cylindrical portions protruding upward from the peripheral edge portions of the left and right first window portions 110a and 110b, are provided, and in the vertical wall portion 108, second cylindrical portions 116 and 116, which are cylindrical portions protruding forward from the peripheral edge portions of the left and right second window portions 112a and 112b, are provided. That is, each of these first and second cylindrical portions 114 and 116 protrudes outward toward the outside of the case 18 formed by assembling the cover portion 70 and the cover portion 70.

[0049] Each of the first and second cylindrical portions 114, 116 has a predetermined protruding height dimension. And on the protruding tip side of each of the first and second cylindrical portions 114, 116, a retaining projection 118 protruding radially inward is provided. In the present embodiment, the retaining projection 118 is formed in an annular shape over the entire circumference in the circumferential direction at the protruding tips of each of the first and second cylindrical portions 114, 116. Thereby, the outer openings 120 of each of the first and second cylindrical portions 114, 116 have a predetermined inner diameter dimension, and the inner diameter dimension φA’ (see FIG. 8) of the outer opening 120 (the inner diameter dimension of the retaining projection 118) in each of the first and second cylindrical portions 114, 116 is smaller than the inner diameter dimension φA of each of the first window portions 110a, 110b.

[0050] Furthermore, a lower protective wall portion 122 protruding downward is provided at the outer peripheral edge portion of the horizontal wall portion 106, and a rear protective wall portion 124 protruding rearward is provided at the outer peripheral edge portion of the vertical wall portion 108. These lower protective wall portion 122 and rear protective wall portion 124 are continuously formed over substantially the entire circumference of the horizontal wall portion 106 and the vertical wall portion 108, and are continuously and integrally formed at the connecting portion between the horizontal wall portion 106 and the vertical wall portion 108. Still further, a partition wall portion 126 for partitioning the region surrounded by the lower protective wall portion 122 and the rear protective wall portion 124 into two is provided on the lower surface of the horizontal wall portion 106 and the rear surface of the vertical wall portion 108. That is, the partition wall portion 126 has a substantially L-shaped extending across the horizontal wall portion 106 and the vertical wall portion 108. And of the two regions partitioned by the partition wall portion 126, the left region is the first accommodation region 128a in which the first connection bus bar 30a is accommodated, and the right region is the second accommodation region 128b in which the second connection bus bar 30b is accommodated.

[0051] In FIG. 12, the first and second connection bus bars 30a and 30b accommodated in the first and second accommodation regions 128a and 128b are indicated by a two-dot chain line. As also shown in FIG. 12, with respect to each of the wall portions 122, 124, and 126 constituting each of the accommodation regions 128a and 128b, the connection bus bars 30a and 30b face each other with a slight gap in the front-rear direction and the left-right direction, and the connection bus bars 30a and 30b are slightly displaceable in the left-right direction within each of the accommodation regions 128a and 128b. Note that a vertical portion 150, which will be described later, of each of the connection bus bars 30a and 30b is sandwiched between the vertical wall portion 108 (rib 130, which will be described later) of the cover portion 70 and the rear end wall portion 79 of the upper case 72, so that the displacement of the connection bus bars 30a and 30b in the front-rear direction within each of the accommodation regions 128a and 128b is substantially impossible. And, as will be described later, since the cover portion 70 is displaceable in the front-rear direction with respect to the case body 68 (upper case 72), the connection bus bars 30a and 30b are displaceable integrally with the cover portion 70 in the front-rear direction with respect to the case body 68 (upper case 72).

[0052] Also, on the lower surface of the horizontal wall portion 106 and the rear surface of the vertical wall portion 108, ribs 130 protruding toward the mounting portion 66 and the rear end wall portion 79 are provided inside the regions surrounded by the lower protection wall portion 122 and the rear protection wall portion 124, respectively. That is, the ribs 130 are provided in both the first accommodation region 128a and the second accommodation region 128b partitioned by the partition wall portion 126. In the present embodiment, a plurality of ribs 130 are provided, and each is formed as a ridge extending in the front-rear direction or the left-right direction. These plurality of ribs 130 form a lattice shape as a whole and are integrally formed.

[0053] When the cover portion 70 is assembled to the upper case 72 with the connection bus bars 30a and 30b housed in the first and second accommodation regions 128a and 128b, respectively, each rib 130 is slightly compressed between the horizontal wall portion 106 and the vertical wall portion 108 and the connection bus bars 30a and 30b, or the ribs 130 and the connection bus bars 30a and 30b are in zero-touch contact, or the ribs 130 and the connection bus bars 30a and 30b face each other with a slight separation distance. That is, when each rib 130 is compressed, the connection bus bars 30a and 30b are pressed upward and forward against the upper wall 76 (mounting portion 66) and the rear end wall portion 79 of the upper case 72 by the elastic restoring force of each rib 130. And, at the time of assembling the in-vehicle component internal circuit unit 10, the ribs 130 suppress the upward floating of the connection bus bars 30a and 30b from the mounting portion 66, thereby restricting the upward displacement of the second and third conduction bus bars 62b and 62c that come into contact with the connection bus bars 30a and 30b from below. As a result, the second and third heat dissipation portions 64b and 64c of the second and third conduction bus bars 62b and 62c are more reliably in contact with the heat transfer surface 104 on the lower wall 88 of the lower case 74 via each heat transfer sheet 100.

[0054] Furthermore, the lower protection wall portion 122 is provided with fitting protrusions 132 that protrude toward the lower case body 68 and fit into the fitting holes 86. These fitting protrusions 132 are provided at positions corresponding to the fitting holes 86 in the upper case 72, and in this embodiment, four fitting protrusions 132 are provided. Specifically, three fitting protrusions 132 are provided on the lower protection wall portion 122 covering the first accommodation region 128a, and one fitting protrusion 132 is provided on the lower protection wall portion 122 covering the second accommodation region 128b. The width dimension of each fitting protrusion 132 in the front-rear direction is smaller than the width dimension b of each fitting hole 86 in the front-rear direction, and each fitting protrusion 132 is displaceable in the front-rear direction within each fitting hole 86. In short, the cover portion 70 is displaceable in the front-rear direction with respect to the case body 68 (upper case 72) to which the cover portion 70 is assembled by the amount that each fitting protrusion 132 is displaceable within each fitting hole 86.

[0055] Lock claws 134 are provided at the protruding ends (lower ends) of the respective fitting protrusions 132. These lock claws 134 protrude inward, that is, toward the mounting portion 66 side from the respective fitting holes 86 into which the respective fitting protrusions 132 are inserted in the case body 68 (upper case 72) to which the cover portion 70 is assembled.

[0056] Note that the method of forming the cover portion 70 is not limited, but in the present embodiment, the cover portion 70 is formed by injection molding, and knockout holes 136 for forming the lock claws 134 by injection molding are formed at positions facing the respective lock claws 134 in the horizontal wall portion 106. In particular, in the present embodiment, each knockout hole 136 is substantially rectangular and is formed in a size that does not allow insertion of a tool such as a driver used for bolt fastening. Specifically, the lateral width dimension c (see FIG. 5) of each knockout hole 136 is smaller than the longitudinal width dimension d (see FIG. 5).

[0057] And in the present embodiment, first bolts 138, 138 and second bolts 140, 140 are respectively accommodated and arranged in first cylindrical portions 114, 114 and second cylindrical portions 116, 116 of the cover portion 70 having the above-described shape. Each of the first and second bolts 138, 140 has substantially the same shape, the shaft portion 142 has a predetermined maximum outer diameter dimension φB (see FIG. 14), and an insulation treatment portion 146 is provided on the head portion 144. The maximum outer diameter dimension φC of the head portion 144 including this insulation treatment portion 146 is made larger than the inner diameter dimension φA' at the outer openings 120 of the first and second cylindrical portions 114, 116, and the outer peripheral edge portion of the head portion 144 including the insulation treatment portion 146 abuts against the retaining projections 118 of the first and second cylindrical portions 114, 116, thereby preventing the first and second bolts 138, 140 from detaching from the first and second cylindrical portions 114, 116. Note that the method of providing the insulation treatment portion 146 on the head portions 144 of the first and second bolts 138, 140 is not limited, and for example, a synthetic resin cap may be fitted and fixed to the head portions 144 of the first and second bolts 138, 140, or the cap and the bolt may be integrally formed.

[0058] <Connecting bus bar 30> In the present embodiment, two bus bars are adopted as the connecting bus bar 30 accommodated in the case 18. The left side is the first connecting bus bar 30a, and the right side is the second connecting bus bar 30b. As also shown in FIG. 14, both the first and second connecting bus bars 30a, 30b are provided with a horizontal portion 148 that extends horizontally at the lower end portion, and a vertical portion 150 that protrudes upward and extends vertically at the rear end portion in the horizontal direction. That is, both the first and second connecting bus bars 30a, 30b are substantially L-shaped as a whole.

[0059] And, at the front end portion 151a (the end portion on the side opposite to the side where the vertical portion 150 is connected to the horizontal portion 148) as the first end portion of the first connection bus bar 30a, a first internal connection portion 22a that is conductively connected to the first circuit side connection portion 20a is provided. Further, at the upper end portion 151b (the end portion on the side opposite to the side where the horizontal portion 148 is connected to the vertical portion 150) as the second end portion of the first connection bus bar 30a, a first external connection portion 28a that is connected to the first connector side connection portion 26a is provided. Similarly, at the front end portion 151a as the first end portion of the second connection bus bar 30b, a second internal connection portion 22b that is conductively connected to the second circuit side connection portion 20b is provided. Further, at the upper end portion 151b as the second end portion of the second connection bus bar 30b, a second external connection portion 28b that is connected to the second connector side connection portion 26b is provided. That is, in each of the connection bus bars 30a and 30b, the front end portion 151a as the first end portion extends in the front-rear direction (the direction from the rear to the front), and the upper end portion 151b as the second end portion extends in the vertical direction (the direction from the bottom to the top).

[0060] In the first and second connection bus bars 30a and 30b, first bolt insertion holes 152 that penetrate in the plate thickness direction (vertical direction) are formed in the respective internal connection portions 22a and 22b. In the present embodiment, the first bolt insertion holes 152 are substantially circular in shape and have a predetermined inner diameter dimension φD (see FIG. 14). The inner diameter dimension φD of the first bolt insertion holes 152 is made larger than the maximum outer diameter dimension φB of the shaft portion 142 of the first bolt 138, and the space between the first bolt insertion holes 152 and the shaft portion 142 of the first bolt 138 is a tolerance absorption gap 154 that can absorb tolerances when the first bolt 138 is inserted into the first bolt insertion holes 152. That is, the first bolt insertion holes 152 are provided with a size including the tolerance absorption gap 154. And since the first bolt insertion holes 152 are substantially circular in shape, the tolerance absorption gap 154 is in an annular shape over the entire circumference in the circumferential direction, and the horizontal direction including the front-rear direction and the left-right direction is a tolerance absorption direction in which tolerances can be absorbed in the first bolt insertion holes 152.

[0061] In addition, in the first and second connection bus bars 30a and 30b, second bolt insertion holes 156 penetrating in the plate thickness direction (front-rear direction) are formed in the respective external connection portions 28a and 28b. In the present embodiment, the second bolt insertion hole 156 has a substantially perfect circular shape and has a predetermined inner diameter dimension φE (see FIG. 14). The inner diameter dimension φE of the second bolt insertion hole 156 is made larger than the maximum outer diameter dimension φB of the shaft portion 142 of the second bolt 140, and the space between the second bolt insertion hole 156 and the shaft portion 142 of the second bolt 140 is a tolerance absorption gap 158 that can absorb tolerances when the second bolt 140 is inserted into the second bolt insertion hole 156. That is, the second bolt insertion hole 156 is provided with a size including the tolerance absorption gap 158. Since the second bolt insertion hole 156 has a substantially perfect circular shape, the tolerance absorption gap 158 has an annular shape extending over the entire circumference in the circumferential direction, and the direction orthogonal to the front-rear direction including the vertical direction and the left-right direction is the tolerance absorption direction in which the second bolt insertion hole 156 can absorb tolerances.

[0062] <Assembly process of in-vehicle component internal circuit unit 10> Subsequently, a specific example of the assembly process of the in-vehicle component internal circuit unit 10 will be described. Note that the assembly process of the in-vehicle component internal circuit unit 10 is not limited to the following description.

[0063] First, bolts 160 are fastened to the connection parts 60 of the first and second relays 58a and 58b respectively to fix the first to fourth busbars 62a to 62d for conduction. The first and second relays 58a and 58b to which the first to fourth busbars 62a to 62d for conduction are fixed are bolted to the upper wall 76 of the upper case 72. Thereafter, the upper case 72 and the lower case 74 are assembled, and the upper case 72 and the lower case 74 are fixed by a locking mechanism (not shown) or the like. As a result, the first to fourth heat dissipation parts 64a to 64d in the first to fourth busbars 62a to 62d for conduction contact the heat transfer surface 104 on the lower wall 88 through the heat transfer sheets 100. Each heat transfer sheet 100 may be fixed in advance to the lower surfaces of the first to fourth heat dissipation parts 64a to 64d, or may be fixed to the upper surface (heat transfer surface 104) on the lower wall 88. As a result, the case main body 68 in which the circuit component 16 is housed is completed.

[0064] In the completed state of this case main body 68, the first and second busbar fixing parts 96a and 96b in the lower case 74 are in contact with the first and second circuit side connection parts 20a and 20b in the second and third busbars 62b and 62c for conduction from below. Further, the first and second circuit side connection parts 20a and 20b are exposed to the outside through the first and second through windows 84a and 84b in the upper case 72.

[0065] Thereafter, the first and second connection bus bars 30a and 30b are placed on the placement portion 66 in the upper case 72. As a result, the first and second internal connection portions 22a and 22b of the first and second connection bus bars 30a and 30b are overlapped with the first and second circuit-side connection portions 20a and 20b exposed to the outside. As a result, the bolt insertion holes constituting the first and second circuit-side connection portions 20a and 20b and the first bolt insertion holes 152 provided in the first and second internal connection portions 22a and 22b communicate with each other. Then, the first and second bolts 138 and 140 are inserted into the first and second bolt insertion holes 152 and 156 in the first and second connection bus bars 30a and 30b, respectively. At this point, each first bolt 138 is not fastened to each nut 98 below the first and second circuit-side connection portions 20a and 20b.

[0066] Subsequently, with the first and second bolts 138 and 140 inserted into the first and second bolt insertion holes 152 and 156, the cover portion 70 is assembled to the upper case 72. Specifically, the fitting protrusion 132 of the cover portion 70 is inserted into the fitting hole 86 of the upper case 72, and the locking claw 134 is locked to the edge portion on the placement portion 66 side of the fitting hole 86 in the upper wall 76 of the upper case 72 as shown in FIG. 10. As a result, the first and second connection bus bars 30a and 30b are accommodated in the first and second accommodation regions 128a and 128b in the cover portion 70, and while the first and second bolts 138 and 140 are accommodated in the first and second cylindrical portions 114 and 116, the cover portion 70 is assembled to the case body 68. As a result, the in-vehicle component internal circuit unit 10 which is the object of the present disclosure is completed. Note that an external circuit (not shown) is electrically connected to the first and fourth conduction bus bars 62a and 62d in the in-vehicle component internal circuit unit 10 at an appropriate timing.

[0067] In the assembled state of the in-vehicle component internal circuit unit 10 (the state where it is not housed in the housing 14 of the in-vehicle component (battery pack 12)), the first and second bolts 138 and 140 are not fastened anywhere and are arranged relatively freely (in a floating state) within the first and second cylindrical portions 114 and 116. And in this state, as shown in FIG. 15, the lower end portions of the respective first bolts 138 are in contact with the nuts 98, and the insulation treatment portions 146 provided on the heads 144 of the respective first bolts 138 protrude outward from the outer openings 120 in the respective first cylindrical portions 114. In the fastened state of each first bolt 138 described later, the insulation treatment portions 146 provided on the heads 144 of the respective first bolts 138 are housed within the respective first cylindrical portions 114. Incidentally, in this state, since the second bolt 140 is relatively free within the second cylindrical portion 116, the insulation treatment portions 146 provided on the heads 144 of the respective second bolts 140 may protrude outward from the outer openings 120 of the respective second cylindrical portions 116, or may be housed within the respective second cylindrical portions 116.

[0068] Next, a specific example of the process of housing the in-vehicle component internal circuit unit 10 in the housing 14 of the in-vehicle component (battery pack 12) will be described. Note that the process of housing the in-vehicle component internal circuit unit 10 in the housing 14 of the in-vehicle component (battery pack 12) is not limited to the following description.

[0069] First, place the in-vehicle component internal circuit unit 10 in the housing main body 32 to which the connector 24 is attached on the rear wall portion 40. As a result, the lower surface of the case main body 68 contacts the bottom wall 36 of the housing 14 via each gap filler 102. Also, align each second bolt 140 inserted into each second bolt insertion hole 156 with each connector-side connection portion 26a, 26b in the connector 24. In this state, as shown in FIG. 16, each second bolt 140 is not fastened to each connector-side connection portion 26a, 26b. And the tip (rear end) of each second bolt 140 contacts the opening of each connector-side connection portion 26a, 26b, and the insulation treatment portion 146 provided on the head 144 of each second bolt 140 protrudes outward from the outer opening 120 in each second cylindrical portion 116. In the fastening state of each second bolt 140 described later, the insulation treatment portion 146 provided on the head 144 of each second bolt 140 is housed in each second cylindrical portion 116.

[0070] From this state, insert a tool or the like through the outer opening 120 in each second cylindrical portion 116 and fasten each second bolt 140 to each connector-side connection portion 26a, 26b. Thereby, the connector 24 and each connection bus bar 30a, 30b are electrically connected via each second bolt 140. Then, insert a tool or the like through the outer opening 120 in each first cylindrical portion 114 and fasten each first bolt 138 to the nut 98 through each first bolt insertion hole 152 and each circuit-side connection portion 20a, 20b. Thereby, the second and third conduction bus bars 62b, 62c electrically connected to each relay 58a, 58b and each connection bus bar 30a, 30b are electrically connected via each first bolt 138. As a result, the external circuit is electrically connected to the connector 24 via the circuit component 16 (the first to fourth conduction bus bars 62a to 62d, the first and second relays 58a, 58b), and the first and second connection bus bars 30a, 30b. After fastening each first and second bolt 138, 140, by fixing the lid 34 to the upper opening of the housing main body 32, the storage of the in-vehicle component internal circuit unit 10 in the housing 14 of the in-vehicle component (battery pack 12) is completed.

[0071] Note that the in-vehicle component internal circuit unit 10 can be removed from the housing 14 of the battery pack 12 by a process reverse to the above. That is, after releasing the fastening between each first bolt 138 and the nut 98, the fastening between each second bolt 140 and each connector-side connection portion 26a, 26b is released. Thereby, the in-vehicle component internal circuit unit 10 can be removed from the housing 14 of the battery pack 12. Note that the connection between the external circuit (not shown) and the first and fourth conduction busbars 62a, 62d is released at an appropriate timing.

[0072] According to the in-vehicle component internal circuit unit 10 housed in the housing 14 of the in-vehicle component (battery pack 12) in this way, each internal connection portion 22a, 22b and each circuit-side connection portion 20a, 20b in each connection busbar 30a, 30b provided in the case 18 are fastened by each first bolt 138. Here, each connection busbar 30a, 30b is displaceable in the front-rear direction (see FIG. 5) with respect to the case main body 68 together with the cover portion 70 in a state of being housed in each housing region 128a, 128b of the cover portion 70, and the inner diameter dimension φD of each first bolt insertion hole 152 is also made larger than the maximum outer diameter dimension φB of the shaft portion 142 of each first bolt 138 in the front-rear direction. Thereby, even when the positions of each first bolt insertion hole 152 and each circuit-side connection portion 20a, 20b are displaced in the front-rear direction due to a tolerance during the fastening of the first bolt 138, the tolerance is absorbed and the first bolt 138 can be fastened more reliably.

[0073] Similarly, each connection busbar 30a, 30b is displaceable in the left-right direction (see FIG. 5) within each housing region 128a, 128b of the cover portion 70, and the inner diameter dimension φD of each first bolt insertion hole 152 through which each first bolt 138 is inserted in each internal connection portion 22a, 22b is also made larger than the maximum outer diameter dimension φB of the shaft portion 142 of each first bolt 138 in the left-right direction. Thereby, even when the positions of each first bolt insertion hole 152 and each circuit-side connection portion 20a, 20b are displaced in the left-right direction due to a tolerance during the fastening of the first bolt 138, the tolerance is absorbed and the first bolt 138 can be fastened more reliably.

[0074] Further, each external connection part 28a, 28b and each connector-side connection part 26a, 26b in each connection bus bar 30a, 30b provided in the case 18 are fastened by each second bolt 140. Here, the inner diameter dimension φE of each second bolt insertion hole 156 is made larger than the maximum outer diameter dimension φB of the shaft part 142 of each second bolt 140 in the vertical direction. Thereby, for example, by adjusting the amount of elastic deformation (compression amount) in the heat transfer sheet 100 and the gap filler 102, even when the positions of each second bolt insertion hole 156 and each connector-side connection part 26a, 26b are displaced in the vertical direction due to a tolerance, the tolerance is absorbed and the second bolt 140 can be fastened more reliably.

[0075] Furthermore, the inner diameter dimension φE of each second bolt insertion hole 156 through which each second bolt 140 is inserted in each external connection part 28a, 28b of each connection bus bar 30a, 30b is also made larger than the maximum outer diameter dimension φB of the shaft part 142 of each second bolt 140 in the horizontal direction. Thereby, when fastening the second bolt 140, even when the positions of each second bolt insertion hole 156 and each connector-side connection part 26a, 26b are displaced in the horizontal direction due to a tolerance, the tolerance is absorbed and the second bolt 140 can be fastened more reliably.

[0076] Also, each connection bus bar 30a, 30b is provided in the case 18, and portions of each connection bus bar 30a, 30b other than each first window part 110a, 110b and each second window part 112a, 112b are covered by the case 18 (cover part 70). Thereby, when an operator performs bolt fastening work or the like, the risk of accidentally contacting a live part and getting an electric shock can be reduced.

[0077] In particular, in this embodiment, the process of bolt fastening work is not limited. However, after first fastening each of the external connection portions 28a and 28b and each of the connector-side connection portions 26a and 26b with each of the second bolts 140, each of the internal connection portions 22a and 22b and each of the circuit-side connection portions 20a and 20b are fastened with each of the first bolts 138. As a result, when each of the second bolts 140 is fastened, the fastening portion on the side of the first bolt 138 to which power is supplied is in an unfastened state, and the fastening portion on the side of the second bolt 140 does not become a live part, so that the bolt fastening work can be performed more safely.

[0078] The left and right first window portions 110a and 110b and the second window portions 112a and 112b are each surrounded by respective first and second cylindrical portions 114 and 116 that protrude outward from the case 18. Thereby, when fastening each of the first and second bolts 138 and 140, the risk of electric shock by contacting the bolt fastening portion that can become a live part through each of the first window portions 110a and 110b and the second window portions 112a and 112b can be further reduced.

[0079] Inside the left and right first window portions 110a and 110b and the second window portions 112a and 112b, each of the first and second bolts 138 and 140 is accommodated, and these first and second bolts 138 and 140 are prevented from detaching from each of the first and second cylindrical portions 114 and 116 by respective retaining protrusions 118. Thereby, there is no need to separately prepare and fasten the first bolt and the second bolt, and the workability of bolt fastening is improved. In particular, since the opening dimensions at the outer openings 120 of each of the first and second cylindrical portions 114 and 116 can be reduced by respective retaining protrusions 118, the risk of electric shock during bolt fastening can be further reduced.

[0080] Since each of the first and second bolts 138, 140 is provided with the insulation treatment portion 146 on the head 144, the risk of an operator being electrocuted through tools or the like during bolt fastening can be reduced. In particular, since each of the first and second bolts 138, 140 has the insulation treatment portion 146 protruding outward from the outer opening 120 when the bolt is not fastened and being housed inside rather than the outer opening 120 when the bolt is fastened, it is possible to visually determine from the outside whether each of the first and second bolts 138, 140 is in a fastened state or an unfastened state. Further, even when the bolt is not fastened, since the insulation treatment portion 146 of each of the first and second bolts 138, 140 only protrudes outward, the risk of accidental contact and electrocution can be reduced.

[0081] The case 18 has a case body 68 on which each connection bus bar 30a, 30b is placed and a cover portion 70 that covers each connection bus bar 30a, 30b and is assembled to the case body 68. And the cover portion 70 and each connection bus bar 30a, 30b are displaceable integrally with respect to the case body 68 in the front-rear direction. Thereby, for example, when each connection bus bar 30a, 30b is displaced in the front-rear direction, it will not be exposed from the cover portion 70 (case 18), and the risk of an operator accidentally contacting each connection bus bar 30a, 30b and being electrocuted can be further reduced. And each first window portion 110a, 110b and each second window portion 112a, 112b are provided in the cover portion 70. Since the cover portion 70 and each connection bus bar 30a, 30b are displaced integrally, it is not necessary to form each first window portion and each second window portion larger in accordance with the displacement of each connection bus bar, and the opening dimensions of each first window portion 110a, 110b and each second window portion 112a, 112b can be set small, and the risk of electrocution can be further reduced.

[0082] The case body 68 has a fitting hole 86 extending in the front-rear direction, and the cover portion 70 has a fitting projection 132 that fits into the fitting hole 86. The fitting projection 132 is displaceable in the front-rear direction within the fitting hole 86. Thereby, while maintaining the assembled state of the case body 68 and the cover portion 70, the cover portion 70 can be displaced in the front-rear direction with respect to the case body 68.

[0083] In particular, the fitting projection 132 has a locking claw 134, and the locking claw 134 protrudes inward toward the mounting portion 66 side rather than the fitting hole 86. This locking claw 134 is adapted to engage with the edge portion on the mounting portion 66 side of the fitting hole 86 in the upper case 72 when the cover portion 70 is assembled to the case body 68. Thereby, the engagement portion between the locking claw 134 and the case body 68 (fitting hole 86) cannot be visually recognized from the outside, and also, for example, even if a tool such as a driver is inserted into the fitting hole 86, it is difficult to bend the fitting projection 132 in the direction of releasing the engagement between the locking claw 134 and the fitting hole 86. Therefore, the assembled state of the case body 68 and the cover portion 70 is stably maintained, and for example, it is avoided that the case accidentally contacts the respective connection bus bars 30a, 30b and gets an electric shock.

[0084] The cover portion 70 is provided with ribs 130 on the surface where the respective connection bus bars 30a, 30b are overlapped. By these ribs 130, the upward displacement of the respective connection bus bars 30a, 30b, and thus the upward displacement of the circuit component 16 including the second and third conduction bus bars 62b, 62c, are suppressed. Thereby, each of the heat radiating portions 64a to 64d can be more reliably brought into contact with the heat transfer surface 104 on the lower wall 88 of the lower case 74 via the heat transfer sheet 100, and the heat dissipation efficiency through the housing 14 of the battery pack 12 can be improved. In particular, in the present embodiment, the heat generation at the connection portion (the fastening portion of each second bolt 140) between the connector 24 and the in-vehicle component internal circuit unit 10 can also be dissipated through the housing 14 of the battery pack 12 via, for example, the respective connection bus bars 30a, 30b and the second and third conduction bus bars 62b, 62c (the second and third heat radiating portions 64b, 64c).

[0085] Each of the connection bus bars 30a and 30b includes a front end portion 151a as a first end portion extending in the front-rear direction and an upper end portion 151b as a second end portion extending in the up-down direction. A first bolt insertion hole 152 is provided in each front end portion 151a, and a second bolt insertion hole 156 is provided in each upper end portion 151b. The inner diameter dimension φD of each first bolt insertion hole 152 is larger than the outer diameter dimension φB of the shaft portion 142 of each first bolt 138 in the horizontal direction including the front-rear direction and the left-right direction, and has a tolerance absorption gap 154. Also, the inner diameter dimension φE of each second bolt insertion hole 156 is larger than the outer diameter dimension φB of the shaft portion 142 of each second bolt 140 in a direction orthogonal to the front-rear direction including the up-down direction and the left-right direction, and has a tolerance absorption gap 158. Thereby, the tolerance absorption direction in each first bolt insertion hole 152 and the tolerance absorption direction in each second bolt insertion hole 156 can be made different from each other, and it becomes possible to absorb tolerances in a plurality of directions.

[0086] <Other Embodiments> The technology described in this specification is not limited to the embodiments described by the above description and drawings. For example, the following embodiments are also included in the technical scope of the technology described in this specification.

[0087] (1) In the above embodiment, each of the connection bus bars 30a and 30b was formed by bending a single metal flat plate. However, as shown in FIG. 17, the first and second connection bus bars 170a and 170b may be configured as a laminate of a plurality of thin plates 172. Thereby, for example, even when the length of each connection bus bar is short and the deformation rigidity is relatively large in a single flat bus bar, each of the connection bus bars 170a and 170b can be deformed flexibly. As a result, tolerances can be absorbed more efficiently, and the circuit-side connection portion and the connector-side connection portion can be stably connected to each of the connection bus bars 170a and 170b.

[0088] (2) In the above-described embodiment, the heat transfer sheet 100 and the gap filler 102 are elastically deformable in the vertical direction, so that the in-vehicle component internal circuit unit 10 is displaceable in the vertical direction with respect to the housing 14 of the battery pack 12, and the vertical tolerance is absorbed. However, the present invention is not limited to this aspect. For example, a play in the vertical direction may be provided in the fitting portion between the fitting protrusion and the fitting hole (the locking portion between the locking claw and the upper wall of the upper case), and by fixing the cover portion and the connection bus bar, the connection bus bar may be integrally displaced in the vertical direction together with the cover portion with respect to the case, so that the vertical tolerance is absorbed. Further, by making the fitting protrusion displaceable in the left-right direction within the fitting hole, the connection bus bar together with the cover portion may be displaceable in the left-right direction with respect to the case.

[0089] (3) In the above-described embodiment, the left and right first window portions 110a, 110b and second window portions 112a, 112b are provided in the cover portion 70, but the cover portion is not essential. That is, the connection bus bar may be displaceably accommodated in a case composed of an upper case and a lower case, and the first window portion and the second window portion may be formed in the upper wall of the upper case.

[0090] (4) In the above-described embodiment, the insulating treatment portion 146 is provided on the heads 144 of the first and second bolts 138, 140, but the shape of the insulating treatment portion is not limited. For example, if a hexagonal hole portion is provided in the central protruding portion of the insulating treatment portion and a tool is inserted into the hole portion to perform bolt fastening, it is also possible to make the opening dimensions of the outer openings in the first and second cylindrical portions smaller.

[0091] (5) The first and second bolts are not limited to the mode of being accommodated in the first and second cylindrical portions, and may be fastened to the circuit-side connection portion and the connector-side connection portion as a separate body from the in-vehicle component internal circuit unit according to the present disclosure. That is, in the in-vehicle component internal circuit unit according to the present disclosure, the first cylindrical portion and the second cylindrical portion are not essential.

[0092] (6) In the above-described embodiment, the nut 98 and each connector-side connection portion 26a, 26b are arranged in a standby state and are configured to be fastened to the first and second bolts 138, 140 accommodated in each first cylindrical portion 114 and each second cylindrical portion 116. However, for example, the first and second bolts may be arranged in a protruding state and the nut may be fastened. As described above, this nut may be accommodated and arranged in the first and second cylindrical portions, or may be separate from the in-vehicle component internal circuit unit according to the present disclosure.

[0093] (7) In the above-described embodiment, the retaining projection 118 is formed in an annular shape that is continuous over the entire circumference in the circumferential direction. However, it may be provided partially in the circumferential direction.

[0094] (8) In the above-described embodiment, two connection busbars 30a, 30b are provided. However, there may be one connection busbar, or three or more connection busbars. Also, the number of relays, conduction busbars, etc. may be changed according to the number of connection busbars, and the types, shapes, numbers, etc. of the members constituting the circuit configuration members are not limited.

[0095] (9) In the above-described embodiment, the tolerance absorption directions are set in the front-rear direction, the left-right direction, and further the up-down direction. However, it is not limited thereto. If there is one required tolerance absorption direction, the connection busbar may be displaceable only in one direction, or may be in an oblique direction.

[0096] (10) In the above-described embodiment, the first and second bolt insertion holes 152, 156 are each formed in a perfect circle shape. However, for example, they may be in an elongated hole shape extending in the tolerance absorption direction.

[0097] (11) In the above embodiment, each rib 130 is provided on the inner surface of the cover portion 70 to suppress the lifting of the first and second connection busbars 30a and 30b, thereby also suppressing the lifting of the second and third conduction busbars 62b and 62c connected to the first and second connection busbars 30a and 30b. However, the present invention is not limited to this aspect. For example, instead of or in addition to the ribs on the cover portion, ribs may also be provided on the inner surface of the upper case, and the lifting of each conduction busbar may be suppressed by the ribs on the inner surface of this upper case. As a result, the contact state between the heat dissipation portion in each conduction busbar and the heat transfer surface in the case body is maintained, and a good heat dissipation effect is exhibited.

[0098] (12) In the above embodiment, when the first and second bolts 138 and 140 are in a non-fastened state, the insulation treatment portions 146 provided on the heads 144 of the first and second bolts 138 and 140 protrude from the first and second cylindrical portions 114 and 116 to the outside. However, the present invention is not limited to this aspect. That is, for example, by making the protruding height dimensions of the cover portion's horizontal wall portion and vertical wall portion from the first and second cylindrical portions larger than the total lengths (including the insulation treatment portions) of the first and second bolts, even when the first and second bolts are in the non-fastened state as shown in FIGS. 15 and 16, the entire first and second bolts including the insulation treatment portions provided on the heads may be accommodated in the first and second cylindrical portions. In that case, it may not be necessary to provide insulation treatment portions on the heads of the first and second bolts. Even when the first and second bolts are in a non-fastened state, being accommodated in the first and second cylindrical portions suppresses the operator from accidentally contacting the first and second bolts and getting an electric shock.

Description of Reference Numerals

[0099] 10 In-vehicle component internal circuit unit 12 Battery pack (in-vehicle component) 14 Housing 16 Circuit component 18 Case 20 Circuit side connection portion 20a First circuit side connection portion 20b Second circuit side connection part 22 Internal connection part 22a First internal connection part 22b Second internal connection part 24 Connector 26 Connector side connection part 26a First connector side connection part 26b Second connector side connection part 28 External connection part 28a First external connection part 28b Second external connection part 30 Connection bus bar 30a First connection bus bar 30b Second connection bus bar 32 Housing body 34 Cover 36 Bottom wall 38 Peripheral wall part 40 Rear wall part 42 Connector insertion hole 44 Bolt 46 Electric wire 48 Core wire 50 Insulation coating 52 Connector housing 54 Connector terminal 56 Mounting part 58a First relay 58b Second relay 60 Connection part 62 Conductive bus bar 62a First conductive bus bar 62b Second conductive bus bar 62c Third conductive bus bar 62d Fourth conductive bus bar 64 Heat dissipation part 64a First heat dissipation part 64b Second heat dissipation part 64c Third heat dissipation part 64d Fourth heat dissipation part 66 Mounting part 68 Case body 70 Cover part 72 Upper case 74 Lower case 76 Upper wall 78 Upper peripheral wall 79 Rear end wall portion 80 Upper front wall 82 Upper rear wall 84 Through window 84a First through window 84b Second through window 86 Fitting hole 88 Lower wall 90 Lower peripheral wall 92 Lower front wall 94 Lower rear wall 96 Bus bar fixing portion 96a First bus bar fixing portion 96b Second bus bar fixing portion 98 Nut 100 Heat transfer sheet 102 Gap filler 104 Heat transfer surface 106 Horizontal wall portion 108 Vertical wall portion 110 First window portion 110a Left first window portion 110b Right first window portion 112 Second window portion 112a Left second window portion 112b Right second window portion 114 First cylindrical portion (cylindrical portion) 116 Second cylindrical portion (cylindrical portion) 118 Anti - pull - out protrusion 120 Outer opening 122 Lower protective wall portion 124 Rear protective wall portion 126 Partition wall portion 128a First accommodation region 128b Second accommodation region 130 Rib 132 Fitting protrusion 134 Lock claw 136 Ejection hole 138 First bolt 140 Second bolt 142 Shaft portion 144 Head portion 146 Insulation treatment portion 148 Horizontal portion 150 Vertical part 151a Front end (first end) 151b Upper end (second end) 152 First bolt insertion hole 154 Tolerance absorption gap 156 Second bolt insertion hole 158 Tolerance absorption gap 160 Bolt 170a First connection bus bar 170b Second connection bus bar 172 Thin plate

Claims

1. An in-vehicle component circuit unit that is housed in a housing of an in-vehicle component, A circuit component; an insulating case that houses the circuit components; a connection bus bar that is housed in the case and has an internal connection portion that is conductively connected to a circuit-side connection portion provided on the circuit component, and an external connection portion that is conductively connected to a connector-side connection portion of a connector provided on the housing; a first window portion provided in the case and arranged to face the internal connection portion of the connection bus bar and a first bolt insertion hole provided in the internal connection portion; a second window portion provided in the case and arranged to face the external connection portion of the connection bus bar and a second bolt insertion hole provided in the external connection portion, the first bolt insertion hole and the second bolt insertion hole are provided with a size including a tolerance absorbing gap extending in a tolerance absorbing direction, the connection bus bar is accommodated in the case so as to be displaceable in the tolerance absorbing direction, the first window portion is opened to a size that allows a bolt fastening operation of the internal connection portion to the circuit side connection portion through the first window portion from the outside of the case, the second window portion is opened to a size that allows a bolt fastening operation of the external connection portion to the connector-side connection portion through the second window portion from the outside of the case. Circuit unit inside an in-vehicle component.

2. The circuit unit according to claim 1 , wherein the first window portion and the second window portion are each surrounded by a cylindrical portion protruding outwardly from the case.

3. 3. The circuit unit in an in-vehicle component according to claim 2, wherein a bolt or a nut is accommodated inside each of the tubular portions of the first window portion and the second window portion, and a radially inward anti-slip protrusion is provided on the protruding tip side of the tubular portion, and the bolt or the nut is prevented from coming off the tubular portion by contacting the anti-slip protrusion.

4. The bolt or the nut housed in each of the cylindrical portions has an insulating treatment portion, The circuit unit in an on-vehicle component according to claim 3 , wherein the insulating portion of the bolt or the nut is capable of protruding from the tubular portion in an unfastened state and is housed within the tubular portion in a fastened state.

5. the case includes a case main body having a mounting portion on which the connection bus bar is mounted, and a cover portion attached to cover the mounting portion and movable in the tolerance absorbing direction relative to the case main body, The circuit unit in an on-vehicle component according to claim 1 , wherein the cover portion has the first window portion and the second window portion, and is displaced in the tolerance absorbing direction together with the connection bus bar.

6. the case body has a fitting hole extending in the tolerance absorbing direction around the mounting portion, 6. The circuit unit in an in-vehicle component according to claim 5, wherein the cover portion has an engagement protrusion that protrudes from a peripheral portion of the cover portion toward the case body and engages with the engagement hole, and a width dimension of the engagement protrusion in the tolerance absorption direction is smaller than that of the engagement hole.

7. the fitting projection has a locking claw provided at a protruding end portion and protruding toward the placement portion side beyond the fitting hole, The circuit unit according to claim 6 , wherein the locking claw inserted into the fitting hole engages with an edge of the fitting hole on the side of the mounting portion.

8. The internal connection portion and the external connection portion extend in directions intersecting each other, the first bolt insertion hole provided in the internal connection portion and the second bolt insertion hole provided in the external connection portion penetrate in directions intersecting each other, 8. The circuit unit in an on-vehicle component according to claim 1, wherein the tolerance absorption direction in the tolerance absorption gap of the first bolt insertion hole and the tolerance absorption direction in the tolerance absorption gap of the second bolt insertion hole are mutually perpendicular directions.

9. 8. The circuit unit in an in-vehicle component according to claim 5, wherein the cover portion has a rib protruding toward the mounting portion, and when the cover portion is assembled to the case body, the rib abuts against or faces the connection bus bar.

10. the connection bus bar has a first end provided with the internal connection portion and a second end provided with the external connection portion and protruding upward from the first end, 10. The circuit unit in an on-vehicle component according to claim 1, wherein the internal connection portion has the first bolt insertion hole having the tolerance accommodating gap in the extension direction of the first end, and the external connection portion has the second bolt insertion hole having the tolerance accommodating gap in the extension direction of the second end.

11. The circuit unit in an on-vehicle component according to claim 1 , wherein the connection bus bar is a laminate of a plurality of thin plates.

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