WO2023166702A1

WO2023166702A1 - Power supply unit

Info

Publication number: WO2023166702A1
Application number: PCT/JP2022/009386
Authority: WO
Inventors: 達哉角田
Original assignee: 株式会社オートネットワーク技術研究所; 住友電装株式会社; 住友電気工業株式会社
Priority date: 2022-03-04
Filing date: 2022-03-04
Publication date: 2023-09-07

Abstract

Provided is a power supply unit in which confirmability of solder lifting is improved at a soldering section between a through-hole of a circuit board and a lead portion of a capacitor.　A power supply unit 10 includes: a capacitor 12 from which a lead portion 34 protrudes; a capacitor holder 32 that holds the capacitor 12; and a circuit board 18 to which the lead portion 34 of the capacitor 12 is soldered. The capacitor holder 32 includes a first holder member 54 and a second holder member 56. The first holder member 56 includes a lead insertion hole 66 through which the lead portion 34 is inserted. The circuit board 18 includes a through-hole 118 to which the lead portion 34 is soldered, and is connected to the second holder member 56 with the first holder member 54 disposed therebetween. The first holder member 54 is disposed closer to the circuit board 18 than the second holder member 56, and is displaceable from a temporary fixing position at which the lead insertion hole 66 and the through-hole 118 are positioned to a permanent fixing position so as to be assembled on the second holder member 56 separated from the circuit board 18.

Description

Power supply unit

The present disclosure relates to power supply units.

Patent Document 1 discloses an auxiliary power supply unit that includes a capacitor having a pair of lead portions projecting from end faces, a capacitor holder that holds the capacitor, and a circuit board to which the lead portions of the capacitor are soldered. ing. In this power supply unit, the capacitor holder is provided with a wall facing the circuit board, and the lead portion fitted in the terminal holding groove provided in the wall is inserted into the through hole of the circuit board and soldered. It is supposed to be attached.

JP 2014-239095 A

However, in the power supply unit described in Patent Document 1, since there is almost no clearance between the opposing wall of the capacitor holder and the circuit board, the solder runs up through the through hole to the opposite side of the solder surface. It is difficult to confirm that there is solder (so-called solder rise). Therefore, further improvements have been sought in order to ensure higher conduction reliability.

Therefore, a power supply unit is disclosed in which it is possible to visually confirm soldering at the soldered portion between the through hole of the circuit board and the lead portion of the capacitor.

A power supply unit of the present disclosure includes a capacitor having a pair of lead portions protruding from a first end surface, a capacitor holder holding the capacitor, and a circuit board to which the lead portions of the capacitor are soldered, wherein the capacitor The holder includes a first holder member holding the first end face side of the capacitor and a second holder member holding the second end face side of the capacitor facing the first end face, wherein the first holder The member has a bottom wall on which the circuit board is arranged to face the second holder member, the bottom wall has a lead insertion hole through which the lead portion is inserted, and the circuit board has a a through hole through which the lead portion inserted through the lead insertion hole of the bottom wall of the first holder member is inserted and soldered; The first holder member is arranged closer to the circuit board than the second holder member. It can be displaced toward the 2 holder member side to a permanent fixing position where it is separated from the circuit board and assembled to the 2nd holder member.

According to the present disclosure, it is possible to provide a power supply unit with improved visual confirmation of soldering at the soldered portion between the through hole of the circuit board and the lead portion of the capacitor.

FIG. 1 is an overall perspective view showing a power supply unit according to Embodiment 1. FIG. 2 is an exploded perspective view of the power supply unit shown in FIG. 1. FIG. 3 is a perspective view from the plane side showing a capacitor module constituting the power supply unit shown in FIG. 1. FIG. 4 is a perspective view from the bottom side of the capacitor module shown in FIG. 3. FIG. 5 is an exploded perspective view of the capacitor module shown in FIG. 3. FIG. 6 is a vertical cross-sectional view of the capacitor module shown in FIG. 3, corresponding to the XVII-XVII cross section in FIG. 7 is a perspective view showing a single capacitor constituting the capacitor module shown in FIG. 3. FIG. FIG. 8 is a perspective view showing the first holder member constituting the capacitor module shown in FIG. 3 in a single state from the plane side. 9 is a perspective view showing the first holder member shown in FIG. 8 from the bottom side. FIG. 10 is a plan view of the first holder member shown in FIG. 8. FIG. FIG. 11 is a perspective view showing the second holder member constituting the capacitor module shown in FIG. 3 in a single state from the plane side. 12 is a perspective view showing the second holder member shown in FIG. 11 from the bottom side. FIG. 13 is a vertical cross-sectional view for explaining the assembling process of the capacitor module shown in FIG. 3, and is the same cross-sectional view as in FIG. 14 is a perspective view showing a state in which the first holder member is in the temporarily fixed position in the capacitor module shown in FIG. 3, viewed from the plane side. FIG. 15 is a perspective view showing the capacitor module shown in FIG. 14 from the bottom side. 16 is a bottom view of the capacitor module shown in FIG. 14. FIG. 17 is a cross-sectional view taken along line XVII-XVII in FIG. 16. FIG.

<Description of Embodiments of the Present Disclosure>
First, the embodiments of the present disclosure are listed and described.
The power supply unit of the present disclosure is
(1) A capacitor having a pair of lead portions protruding from a first end face, a capacitor holder holding the capacitor, and a circuit board to which the lead portions of the capacitor are soldered, wherein the capacitor holder a first holder member that holds the first end face side of the capacitor; and a second holder member that holds the second end face side of the capacitor facing the first end face, wherein the first holder member holds the The circuit board has a bottom wall spaced apart from the second holder member so as to face the circuit board, the bottom wall has lead insertion holes through which the lead portions are inserted, and the circuit board includes the first circuit board. It has a through hole through which the lead portion inserted through the lead insertion hole of the bottom wall of the holder member is inserted and soldered, and is connected to the second holder member with the first holder member interposed therebetween. The first holder member is arranged closer to the circuit board than the second holder member, and is positioned closer to the second holder member than the temporary fixing position where the lead insertion hole and the through hole are positioned. It is displaceable to a main fixing position where it is attached to the second holder member away from the circuit board.

According to the power supply unit of the present disclosure, the capacitor holder that holds the capacitor has a divided structure including the first holder member and the second holder member, and the circuit board has the first holder member disposed therebetween. It is connected to the second holder member. Further, the first holder member is arranged closer to the circuit board than the second holder member, and is separated from the circuit board toward the second holder member from the temporarily fixed position where the lead insertion hole and the through hole are positioned. Then, it can be displaced to the final fixing position where it is assembled to the second holder member. As a result, in the assembly stage before soldering the lead portion to the through-hole, by holding the first holder member in the temporarily fixed position, the through-hole and the lead insertion hole are positioned so as to be continuous. , the step of inserting the lead portion of the capacitor to them can be easily and stably performed. Furthermore, in the soldering stage of soldering the lead portions to the through holes, the first holder member can be assembled with the second holder member by displacing the first holder member from the temporary fixing position to the final fixing position. Thus, the lead portions of the capacitor, which have been inserted through the through holes in advance, can be soldered to the through holes while the capacitor is stably held between the first holder member and the second holder member. At this time, since the first holder member is separated from the circuit board and attached to the second holder member, a gap is formed between the first holder member and the circuit board. It is possible to more reliably and easily confirm whether or not the solder has risen along the inside of the through hole to the side of the first holder member, which is the opposite side of the solder surface of the substrate. As described above, according to the power supply unit of the present disclosure, it is possible to provide a power supply unit in which it is possible to visually confirm soldering at the soldered portion between the through hole of the circuit board and the lead portion of the capacitor.

(2) The first holder member has an engaging protrusion projecting from the bottom wall toward the circuit board, and the engaging protrusion is press-fitted into an engaging hole provided in the circuit board. Accordingly, it is preferable that the first holder member is positioned on the circuit board and held at the temporarily fixed position. The first holder member and the circuit board are positioned by press-fitting the engagement protrusion of the first holder member into the engagement hole of the circuit board, and are held at the temporarily fixed position. Accuracy is improved, and the first holder member can be easily removed from the temporarily fixed position.

(3) The first holder member is assembled to the second holder member by lockingly fitting the locking portion provided on the first holder member to the locked portion provided on the second holder member. preferably held in the final fixing position. As a result, the assembling of the first holder member to the final fixing position to the second holder member can be stably performed without an increase in the number of parts due to the locking engagement between the locking portion and the locked portion provided on the first holder member. Advantageously, it is possible to realize assembly workability and soldering work stability.

(4) The first holder member has a pressing portion that protrudes and spreads outward from the outer peripheral edge of the circuit board, and the pressing force applied to the pressing portion causes the first holder member to move to the It is preferable that it can be displaced from the temporarily fixed position to the permanent fixed position. Since the first holder member has the pressing portion that protrudes outward from the outer peripheral edge of the circuit board, the operator can easily press the pressing portion from the outside. This makes it easy to move the first holder member interposed between the circuit board and the second holder member from the temporarily fixed position to the permanently fixed position.

(5) The first holder member has an exposed portion exposed through a through hole provided in the circuit board, and the exposed portion is exposed through the through hole of the circuit board at the temporarily fixed position of the first holder member. It is preferable that the first holder member can be displaced from the temporarily fixed position to the permanently fixed position by a pressing force applied to the portion. Since the first holder member has the exposed portion exposed to the outside through the through-hole of the circuit board, the exposed portion can be easily pressed from the outside by the operator. This makes it easy to move the first holder member interposed between the circuit board and the second holder member from the temporarily fixed position to the permanently fixed position. In particular, by employing a combination of the pressing portion and the exposed portion, it is possible to move the first holder member from the temporarily fixed position to the permanently fixed position more quickly and stably.

(6) The lead insertion hole of the first holder member has a tapered shape that decreases in diameter toward the circuit board, and the minimum diameter of the lead insertion hole is larger than the outer diameter of the lead portion. It is preferably large and smaller than the diameter of the through hole. Thus, by simply inserting the lead portion into the lead insertion hole positioned in the through hole at the temporary fixing position of the first holder member, the lead portion is stably guided to the center of the through hole by the tapered lead insertion hole. Therefore, the operation of inserting the lead portion into the through hole can be performed more easily and stably.

(7) Each of the lead portions of the capacitor includes a proximal side straight portion protruding from the first end surface, a first curved portion positioned at a distal end portion of the proximal side straight portion and bent at a right angle, and the an intermediate extending portion extending straight from a first curved portion; a second curved portion located at the tip of the intermediate extending portion and bent perpendicularly in a direction opposite to the first curved portion; and the second curved portion. and a tip-side straight portion projecting parallel to the base-side straight portion from the lead portion, and the tip-side straight portions of the pair of lead portions are displaced in the same direction with respect to the base-side straight portions. , is preferred. The lead portion of the capacitor is connected to the base end side straight portion and the tip end side straight portion projecting parallel to each other through the first curved portion and the second curved portion in which the intermediate extending portions are bent at right angles in opposite directions. and has a crank shape as a whole. As a result, even if an external force is applied to the capacitor when it is used in a vehicle, the external force is absorbed by the crank shape of the lead portion, and it is possible to advantageously prevent or suppress problems such as cracks due to stress applied to the soldered portion. . Further, the pair of lead portions has a crank shape bent in the same direction so that the tip side straight portions of the pair of lead portions are displaced in the same direction with respect to the base end side straight portions. As a result, it is possible to impart directionality to the capacitor, and it is possible to prevent erroneous insertion of the positive and negative electrodes when inserting the pair of lead portions into the lead insertion holes.

(8) The bottom wall of the first holder member has an opening toward the first end surface of the capacitor, and has an accommodation groove into which the intermediate extending portion can be fitted. It is preferable that the extending portion is fitted in the accommodation groove. The intermediate extending portion of the lead portion is adapted to be fitted into the accommodation groove of the first holder member. Accordingly, even when the first holder member is placed at either the temporary fixing position or the final fixing position, the lead is prevented from being subjected to an unexpected external force, vibration, or the like to the capacitor held by the first holder member. The portion can be stably held, and deformation of the lead portion can be suppressed or prevented. In particular, displacement of the lead portions during soldering is suppressed when the first holder member is arranged at the final fixing position. In addition, even if an external force is applied to the lead portions after soldering, displacement of the lead portions can be suppressed, and problems such as cracks occurring in the soldered portions can be prevented.

<Details of the embodiment of the present disclosure>
A specific example of the power supply unit of the present disclosure will be described below with reference to the drawings. The present disclosure is not limited to these examples, but is indicated by the scope of the claims, and is intended to include all modifications within the scope and meaning equivalent to the scope of the claims.

<Embodiment 1>
The power supply unit 10 according to the first embodiment of the present disclosure will be described below with reference to FIGS. 1 to 17. FIG. The power supply unit 10 of the present embodiment is a multifunctional backup power supply for systems such as steer-by-wire (SBW), brakes, electric power steering (EPS), and automatic driving in the event of a power failure in an electric vehicle, hybrid vehicle, or the like. Used as a unit, it is a high-capacity power supply unit. Although the power supply unit 10 can be arranged in any direction, the power supply unit 10 will be described with respect to each of the up/down, left/right, and front/rear directions shown in FIG. In addition, in the following description, with respect to a plurality of identical members, only some of the members may be given reference numerals, and the reference numerals of other members may be omitted.

<Power supply unit 10>
The power supply unit 10, as also shown in FIG. 2, includes a capacitor module 14 including a plurality of capacitors 12, and a case 16 in which the capacitor module 14 is accommodated. In addition to the capacitor module 14 , the case 16 includes a control board 22 electrically connected to the circuit board 18 provided in the capacitor module 14 via a connector 20 , and a connector 24 electrically connected to the control board 22 . and are housed. The connector 24 is exposed at the front opening of the case 16, and a connector (not shown) of a mating device is electrically connected to the connector 24, thereby connecting the power supply unit 10 and the mating device. It is designed to be electrically connected. A connector cover 26 is provided at the front opening of the case 16 to prevent water from entering the inside of the case 16 . Further, in this embodiment, the case 16 is composed of a generally box-shaped lower case 28 that opens upward, and a generally lid-shaped upper case 30 that covers the upper opening of the lower case 28 . These lower case 28 and upper case 30 may be made of any material including, for example, synthetic resin and metal.

<Capacitor module 14>
3 to 6, the capacitor module 14 includes a plurality of capacitors 12, a capacitor holder 32 holding each capacitor 12, and a circuit board 18 to which lead portions 34 of each capacitor 12 are soldered. , contains Although the capacitor module 14 can be arranged in any direction in the case 16, for the sake of convenience, the capacitor module 14 will be described with respect to each of the vertical, horizontal, and longitudinal directions shown in FIG. In the present embodiment, as also shown in FIG. 2, the lower end of the capacitor module 14 is laterally arranged in the case 16 so as to face rightward. In this way, the vertical, horizontal, and forward/backward directions of the power supply unit 10 shown in FIG. 1 do not need to match the vertical, left/right, and front/back directions of the capacitor module 14 shown in FIG.

<Capacitor 12>
As also shown in FIG. 7, the capacitor 12 has a substantially cylindrical capacitor body 36 as a whole. One (right in FIG. 7) end face in the length direction of the capacitor body 36 is the first end face 38, and the other (left in FIG. 7) end face in the length direction facing the first end face 38. is the second end face 40 . The capacitor body 36 accommodates a conventionally known power storage element. A reduced-diameter portion 42 having a reduced outer diameter is provided at one end in the length direction of the capacitor body 36. The effect of making it easy to recognize one side and the other side of the capacitor main body 36 in the length direction is achieved. Although the number of capacitors 12 is not limited, 16 capacitors 12 are provided in the present embodiment, and eight capacitors 12 arranged in the left-right direction are provided in front and rear two rows.

<Lead portion 34>
A pair of

lead portions

34 a and 34 b protrude from the first end surface 38 of the capacitor body 36 . These

lead portions

34a and 34b extend in the longitudinal direction of the capacitor body 36 as a whole, and are separated from each other by a predetermined distance in the radial direction (horizontal direction) of the capacitor body 36. As shown in FIG.

In this embodiment, each of the

lead portions

34a and 34b has a bent portion in the middle portion in the length direction. That is, each of the

lead portions

34a and 34b has a proximal side straight portion 44 that straightly projects from the first end face 38 at the projecting proximal end portion, and the projecting distal end portion of each proximal side straight portion 44 has a , a first bent portion 46 that bends substantially at right angles to each base end side straight portion 44 is provided. An intermediate extending portion 48 extends substantially straight from the end portion of each first curved portion 46 on the side opposite to each base end side straight portion 44 . In each intermediate extending portion 48 , an end portion (protruding tip portion) opposite to the first curved portion 46 is substantially provided on the side opposite to the first curved portion 46 with respect to each intermediate extending portion 48 . A second curved portion 50 that bends at right angles is provided. A tip-side straight portion 52 extends substantially parallel to each proximal-side straight portion 44 from an end portion of each second curved portion 50 opposite to each intermediate extending portion 48 .

In particular, in each of the

lead portions

34a and 34b in this embodiment, each tip side straight portion 52 is displaced in the same direction with respect to each base end side straight portion 44. As shown in FIG. Specifically, in a state assembled to the capacitor holder 32 shown in FIG. The projecting portion 48 is bent rearward, and each intermediate extending portion 48 extends in the front-rear direction. Further, at the rear end (protruding distal end) of each intermediate extension 48 , each tip-side straight portion 52 is bent downward by each second bending portion 50 with respect to each intermediate extension 48 . A tip-side straight portion 52 extends downward. Therefore, in each of the

lead portions

34 a and 34 b in this embodiment, each tip side straight portion 52 is displaced rearward with respect to each base end side straight portion 44 .

<Capacitor holder 32>
The capacitor holder 32 has a lower holder 54 as a first holder member that holds the first end face 38 side of the capacitor 12 and an upper holder 56 as a second holder member that holds the second end face 40 side of the capacitor 12. there is The lower holder 54 and the upper holder 56 that constitute the capacitor holder 32 are each made of synthetic resin.

<First Holder Member (Lower Holder 54)>
As shown in FIGS. 8 to 10, the lower holder 54 as a whole has a generally box-like shape that opens upward. and a lower peripheral wall 60 projecting upward at the outer peripheral edge of 58 . As will be described later, the circuit board 18 is superimposed under the lower holder 54 and the upper peripheral wall 92 of the upper holder 56 is superimposed on the lower peripheral wall 60 of the lower holder 54 , so that the bottom wall 58 faces the circuit board 18 . and separated from the upper holder 56 . A lower partition wall 62 is provided inside the substantially box-shaped lower holder 54 , and the inner space of the lower holder 54 is divided by the lower partition wall 62 into one longitudinal direction (first end face 38 ) of the substantially cylindrical capacitor 12 . side) is partitioned so that it can be inserted. That is, the bottom wall 58, the lower peripheral wall 60, and the lower partition wall 62 form a substantially bottomed cylindrical lower cylindrical storage portion 64 that opens upward. Sixteen lower cylindrical housing portions 64 are provided corresponding to the capacitors 12, and eight lower cylindrical housing portions 64 arranged in the left-right direction are provided over two rows in the front and rear directions. The lower peripheral wall 60 and the lower partition wall 62 have a shape that follows the shape of the outer peripheral surface of the capacitor 12, and a portion curved in an arc shape in a plan view is continuously formed in the left-right direction.

Further, the

lead portions

34a and 34b of the capacitor 12 are inserted through the bottom wall 58 in the thickness direction (vertical direction) through the portions of the bottom wall 58 that constitute the respective lower cylindrical housing portions 64. Lead

insertion holes

66a and 66b are formed. These

lead insertion holes

66a and 66b are provided corresponding to the

respective lead portions

34a and 34b. are placed apart. In this embodiment, the inner diameters of the

lead insertion holes

66a and 66b are different in the vertical direction. The inner diameter of the upper portions of the

holes

66a and 66b gradually increases upward. That is, a tapered surface 68 whose diameter gradually increases upward is formed on the upper portion of the inner surface of each of the

lead insertion holes

66a and 66b. In other words, the

lead insertion holes

66a and 66b gradually decrease in diameter downward, and the inner diameter dimension is substantially constant in the lower portion. As will be described later, the circuit board 18 is placed under the bottom wall 58, so that the

lead insertion holes

66a and 66b are tapered toward the circuit board 18. As shown in FIG.

A groove-shaped receiving groove 70 extending in a direction orthogonal to the central axis direction of each

lead insertion hole

66a, 66b opens upward at the upper opening peripheral edge of each

lead insertion hole

66a, 66b. formed by As will be described later, the ends of the capacitors 12 on the side of the first end face 38 are inserted into the respective lower cylindrical accommodation portions 64 of the lower holder 54 so that the bottom wall 58 and the first end face 38 are overlapped. , each receiving groove 70 opens toward the first end surface 38 . In this embodiment, each accommodation groove 70 extends in the front-rear direction, and the front end of each accommodation groove 70 opens to the inner surface (tapered surface 68) of each lead insertion hole 66a, 66b. and the

lead insertion holes

66a and 66b communicate with each other. In short, each accommodation groove 70 extends rearward from the peripheral edge of the opening above each

lead insertion hole

66a, 66b. In particular, in the present embodiment, a tapered surface 72 that gradually expands upward is also provided at the upper opening peripheral edge of each accommodation groove 70, and both tapered

surfaces

68 and 72 are continuous with each other. there is The tapered surface 72 provided in each accommodation groove 70 is provided over substantially the entire circumferential length of each accommodation groove 70 .

Furthermore, pressing portions 74 projecting outward in the left-right direction are integrally formed at both ends in the left-right direction of the bottom wall 58 . In the present embodiment, both pressing

portions

74, 74 are provided at approximately the central portion of the bottom wall 58 in the front-rear direction. An engagement projection 76 projecting downward is integrally formed at a predetermined location on the bottom wall 58 . In this embodiment, two engaging protrusions 76 are provided, and both engaging

protrusions

76, 76 are provided separated from each other in the left-right direction at substantially the central portion of the bottom wall 58 in the front-rear direction. ing. As will be described later, the circuit board 18 is overlaid under the bottom wall 58 , so each engagement protrusion 76 protrudes toward the circuit board 18 side. Further, an insertion hole 78 through which a screwing portion 104 of an upper holder 56 (to be described later) is inserted is formed in a substantially central portion of the bottom wall 58 .

In the lower holder 54 , lock portions 80 are provided at a plurality of locations on the outer peripheral edge of the lower peripheral wall 60 to lock-fit with the locked portions 106 of the upper holder 56 described later. Specifically, the locking portion 80 includes a thin plate-like elastic piece 82 that protrudes upward from the upper end portion of the lower peripheral wall 60 and is elastically deformable in the front-rear direction, and the upper end portion of the elastic piece 82 protrudes inward in the front-rear direction. and a claw portion 84 . Further, the lower peripheral wall 60 and the lower partition wall 62 of the lower holder 54 are integrally formed with positioning projections 86 projecting upward at a plurality of locations. Further, the rear end portion of the lower peripheral wall 60 of the lower holder 54 is formed with a plurality of notch-like recesses 88 for avoiding interference with the columnar protrusions 114 of the upper holder 56, which will be described later.

<Second holder member (upper holder 56)>
As shown in FIGS. 11 and 12, the upper holder 56 has a generally box-like shape that opens downward as a whole. It has an upper peripheral wall 92 projecting downward at the outer peripheral edge of the wall 90 . An upper partition wall 94 is provided inside the substantially box-shaped upper holder 56 , and the internal space of the upper holder 56 is divided by the upper partition wall 94 into the other longitudinal direction (second end surface 40 ) of the substantially cylindrical capacitor 12 . side) is partitioned so that it can be inserted. That is, the upper bottom wall 90, the upper peripheral wall 92, and the upper partition wall 94 form a substantially bottomed cylindrical upper cylindrical accommodating portion 96 that opens downward. Sixteen upper cylindrical housing portions 96 are provided corresponding to the capacitors 12, and the eight upper cylindrical housing portions 96 arranged in the left-right direction are provided over two front and rear rows. The upper peripheral wall 92 and the upper partition wall 94 have a shape that follows the shape of the outer peripheral surface of the capacitor 12, and a portion curved in an arc shape in plan view is formed continuously in the left-right direction.

A substantially circular communication hole 98 penetrating through the upper bottom wall 90 in the thickness direction (vertical direction) is formed in the portion of the upper bottom wall 90 that constitutes each of the upper cylindrical housing portions 96 . A substantially rectangular communication window 100 is formed through the upper peripheral wall 92 in the thickness direction (front-to-rear direction) in a portion of the upper peripheral wall 92 that constitutes each of the upper cylindrical housing portions 96 . Each communication window 100 is formed with a predetermined vertical dimension from the upper end of the upper peripheral wall 92 . Vapor or the like leaking from the capacitor 12 can be released to the outside through these communication holes 98 and communication windows 100 . At the lower end of each communication window 100, a substantially rectangular holding piece 102 protruding upward is provided. Each pressing piece 102 is a substantially rectangular thin plate and is elastically deformable in the front-rear direction. In the single state of the upper holder 56 before each capacitor 12 is mounted, each pressing piece 102 is inclined inwardly of the upper holder 56 (each upper cylindrical accommodating portion 96), When the capacitor 12 is inserted, each pressing piece 102 is pressed outward in the front-rear direction by the outer peripheral surface of each capacitor 12 . Each capacitor 12 is held in a state of being accommodated in each upper cylindrical accommodating portion 96 by the elastic restoring force of each pressing piece 102 .

Furthermore, a screwing portion 104 projecting downward from the upper partition wall 94 is formed in the substantially central portion of the upper holder 56 . A portion projecting forward is provided at the right end portion of the upper peripheral wall 92 , and a screwing portion 104 projecting downward is integrally formed in the portion projecting forward from the upper peripheral wall 92 . . Threaded holes are provided in the lower end surfaces of these screwing portions 104 so that screws 130, which will be described later, can be screwed thereon.

On the outer peripheral surface of the upper peripheral wall 92 of the upper holder 56 , a locked portion 106 that lock-fits with the locking portion 80 is provided at a position corresponding to the locking portion 80 of the lower holder 54 . In this embodiment, as the locked portion 106 , a projection having a substantially triangular or substantially trapezoidal cross section protrudes outward in the front-rear direction from the outer peripheral surface of the upper peripheral wall 92 . The lower surface of the protrusion is formed as an inclined surface 108 that slopes upward as it extends outward in the front-rear direction, and the upper surface of the protrusion is formed as a horizontal surface 110 that spreads in the horizontal direction (perpendicular to the vertical direction). there is When the locking portion 80 and the locked portion 106 are lock-fitted, the inclined surface 108 of the locked portion 106 elastically deforms the locking portion 80 (the elastic piece 82 and the claw portion 84) outward in the front-rear direction. When the claw portion 84 climbs over the horizontal surface 110 , the elastic piece 82 is elastically deformed for restoration, and the claw portion 84 is locked to the horizontal surface 110 .

In addition, the upper peripheral wall 92 and the upper partition wall 94 of the upper holder 56 are provided with positioning recesses 112 opening upward at a plurality of locations. Further, columnar projecting portions 114 projecting downward are provided at a plurality of locations on the outer peripheral edge of the upper peripheral wall 92 . A locking protrusion 116 protruding downward is provided on the protruding tip surface (lower end surface) of each columnar protrusion 114 . These locking projections 116 are composed of a pair of projecting pieces that have claws at their protruding ends and are separated from each other. are elastically deformed in the direction of approaching each other, and the lock protrusion 116 is inserted into the lock hole 122 . When the claw portion of each projecting piece passes through the lock hole 122 , each projecting piece is elastically restored and deformed, and each claw portion is engaged with the circuit board 18 .

<Circuit board 18>
The circuit board 18 is formed by printing a conductor such as metal on a hard rectangular plate made of synthetic resin or the like. ) is printed with a circuit (not shown) consisting of a conductor. A connector 20 electrically connected to a control board 22 is fixed on the upper surface of the circuit board 18 , and the connector 20 is electrically connected to the circuit on the circuit board 18 . The circuit board 18 has a lateral dimension substantially equal to that of the lower holder 54 and a longitudinal dimension greater than that of the lower holder 54 .

5, the circuit board 18 is formed with a plurality of through holes 118 through which the

lead portions

34a and 34b of the capacitors 12 are inserted. there is As will be described later, each through hole 118 is positioned and communicated with each lead insertion hole 66a, 66b. is inserted. In other words, the

lead portions

34a and 34b inserted through the

lead insertion holes

66a and 66b are inserted through the through holes 118, respectively. The

lead portions

34a and 34b inserted through the through holes 118 are soldered to the through holes 118 with solder 134 (see FIG. 6), which will be described later. As shown in FIG. 17, the inner diameter φA of the through hole 118 is larger than the minimum inner diameter φB of the lead insertion hole 66 provided in the bottom wall 58 of the lower holder 54, and the minimum inner diameter of the lead insertion hole 66 The dimension φB is made larger than the outer diameter dimension φC of the

lead portions

34a and 34b.

Further, at a plurality of locations of the circuit board 18, engagement holes 120 into which the engagement projections 76 of the lower holder 54 are inserted in a substantially press-fit state, lock holes 122 into which the lock projections 116 of the upper holder 56 are inserted, and Screw insertion holes 124 through which screws 130 (to be described later) screwed into the respective screwing portions 104 of the upper holder 56 are inserted are formed through the plate thickness direction. A through hole 126 is formed through the circuit board 18 in the thickness direction. As a result, the lower surface of the bottom wall 58 of the lower holder 54 is exposed to the outside through the through hole 126 when the lower holder 54 and the circuit board 18 are assembled together, which will be described later. As shown in FIG. 16, which will be described later, when the lower holder 54 and the circuit board 18 are assembled, the exposed portion 128 is the lower surface of the bottom wall 58 of the lower holder 54 that is exposed from the circuit board 18 through the through hole 126. be. In this embodiment, two circular through-holes 126 are provided in the laterally intermediate portion of the circuit board 18 so as to be separated from each other in the lateral direction.

<Assembly Process of Capacitor Module 14>
Next, a specific example of the process of assembling the capacitor module 14 will be described. Note that the process of assembling the capacitor module 14 is not limited to the following description.

First, a plurality (16 in this embodiment) of capacitors 12, circuit boards 18, connectors 20, upper holders 56 and lower holders 54 are prepared. Then, the engaging protrusions 76 protruding downward from the bottom wall 58 of the lower holder 54 are inserted into the engaging holes 120 of the circuit board 18 in a substantially press-fit state to position the lower holder 54 and the circuit board 18. Overlap vertically. As a result, as also shown in FIG. 13, the

lead insertion holes

66a and 66b in the lower holder 54 and the through holes 118 in the circuit board 18 are positioned and communicate concentrically in the vertical direction. Note that the connector 20 may be fixed to the circuit board 18 before the circuit board 18 and the lower holder 54 are overlapped, or may be attached at any timing.

After that, the end of each capacitor 12 on the side of the first end surface 38 is inserted into each of the lower cylindrical accommodating portions 64 of the lower holder 54 . At this time, the

lead portions

34 a and 34 b protruding from the first end face 38 of each capacitor 12 are inserted through the lead insertion holes 66 a and 66 b and the through holes 118 . Intermediate extending portions 48 extending in the front-rear direction of the

lead portions

34a and 34b are accommodated and fitted in respective accommodation grooves 70 extending rearward from the

lead insertion holes

66a and 66b. Note that this operation is performed, for example, by turning the opening of each lower cylindrical housing portion 64 of the lower holder 54 upward and moving the end of each capacitor 12 on the side of the first end surface 38 with respect to each lower cylindrical housing portion 64 . is inserted from above.

Subsequently, the upper holder 56 is superimposed from above on each capacitor 12 held by the lower holder 54 , and the end of each capacitor 12 on the side of the second end surface 40 is inserted into each upper cylindrical accommodating portion 96 of the upper holder 56 . be. As a result, the lock protrusions 116 of the upper holder 56 are inserted into the lock holes 122 of the circuit board 18 , and the claws of the projecting ends of the lock protrusions 116 are engaged with the circuit board 18 . Further, the screwing portion 104 in the central portion of the upper holder 56 is inserted through the insertion hole 78 of the lower holder 54 and overlapped with the circuit board 18, and the screwing hole of the screwing portion 104 and the screw insertion hole 124 of the circuit board 18 are communicated with each other. be. Furthermore, the screwing portion 104 in the right front portion of the upper holder 56 is overlapped with the circuit board 18 so that the screw hole of the screwing portion 104 and the screw insertion hole 124 of the circuit board 18 are communicated with each other. In addition to locking the circuit board 18 by the locking protrusion 116, the upper holder 56 and the circuit board 18 are fastened by inserting the screws 130 through the screw holes and the screw insertion holes 124, thereby locking the upper holder 56 and the circuit board 18 together. They are connected in a state where they are arranged in between.

This completes the capacitor module 14 with the lower holder 54 at the temporarily fixed position, as shown in FIGS. 14 to 17 . In this state, as also shown in FIG. 16 , an exposed portion 128 on the lower surface of the bottom wall 58 of the lower holder 54 is exposed to the outside through a through hole 126 provided in the circuit board 18 . Both pressing portions 74 protruding laterally outward from the bottom wall 58 of the lower holder 54 protrude laterally outward from the outer peripheral edge portion of the circuit board 18 . Furthermore, in this state, the lower holder 54 and the upper holder 56 are vertically separated by a predetermined distance, and the lower holder 54 is arranged closer to the circuit board 18 than the upper holder 56 is. In particular, the engagement protrusion 76 is press-fitted into the engagement hole 120 to hold the lower holder 54 at the temporarily fixed position.

In the capacitor module 14 in which the lower holder 54 is in the temporarily fixed position, the pressing portions 74 projecting outward in the left-right direction from the circuit board 18 and the exposed portions 128 exposed through the through holes 126 approach the upper holder 56 . exert an external force in the direction to Specifically, in the capacitor module 14 that has been turned upside down, a pressing force is applied to each of the pressing portions 74 and each of the exposed portions 128 in a downward direction. Alternatively, in the capacitor module 14 in the state shown in FIG. 14 , a pressing force is applied to each of the pressing portions 74 and each of the exposed portions 128 in an upward direction. As a result, the lower holder 54 is displaced toward the upper holder 56 , the claws 84 of the locking portions 80 climb over the locked portions 106 , and the locking portions 80 are lock-fitted to the locked portions 106 . be done.

The displacement of the lower holder 54 in the approaching direction to the upper holder 56 is caused, for example, by contact between the lower peripheral wall 60 of the lower holder 54 and the upper peripheral wall 92 of the upper holder 56 , or by contact between the second end surface 40 of each capacitor 12 and the upper bottom wall of the upper holder 56 . 90 is limited by the abutment. As a result, as shown in FIGS. 2 to 4 and 6, the capacitor module 14 with the lower holder 54 at the final fixing position is completed. In this state, the lower holder 54 is separated from the circuit board 18 and attached to the upper holder 56 . The lower holder 54 is held at the fully fixed position by lockingly fitting the locking portions 80 to the locked portions 106 .

In the capacitor module 14 in which the lower holder 54 is at the final fixing position, the lower holder 54 is displaced in a direction away from the circuit board 18, so that a gap 132 is formed between the lower holder 54 and the circuit board 18 in the vertical direction. can be Then, solder 134 (indicated by a two-dot chain line in FIG. 6) is poured into each through hole 118 of the circuit board 18 and fixed in a state in which a gap 132 is formed between the lower holder 54 and the circuit board 18 in the vertical direction. Thus, the

lead portions

34a and 34b of each capacitor 12 inserted through each through hole 118 and the circuit on the circuit board 18 are electrically connected.

<Assembly Process of Power Supply Unit 10>
Next, a specific example of the process of assembling the power supply unit 10 will be described. Note that the process of assembling the power supply unit 10 is not limited to the following description.

The capacitor module 14 manufactured as described above is housed in the lower case 28 and fixed. Then, the control board 22 is fixed to the lower case 28 while the connectors 20 provided on the circuit board 18 and the control board 22 are electrically connected. Furthermore, each connector 24 is fixed to the lower case 28 in a state where each connector 24 is electrically connected to the control board 22 . After that, a connector cover 26 is superimposed so as to cover each connector 24 and fixed to the lower case 28 . While the capacitor module 14, the control board 22, the connectors 24 and the connector cover 26 are fixed to the lower case 28 in this manner, the upper case 30 is superimposed on the lower case 28 from above and fixed. Thus, the power supply unit 10 is completed.

According to the power supply unit 10 of the present embodiment manufactured as described above, when inserting the

lead portions

34a and 34b into the

lead insertion holes

66a and 66b and the through holes 118 when manufacturing the capacitor module 14, The lower holder 54 is in the temporarily fixed position, and the lower holder 54 and the circuit board 18 are overlapped so that the

lead insertion holes

66a and 66b and the through holes 118 are positioned and communicated with each other. As a result, the

lead portions

34a and 34b can be easily inserted into the

lead insertion holes

66a and 66b and the through holes 118, respectively. When the solder 134 is poured into the through holes 118 to solder the

lead portions

34a and 34b to the through holes 118, the lower holder 54 is at the final fixing position, and there is a gap between the circuit board 18 and the lower holder 54. , a gap 132 is formed. As a result, it is possible to confirm the rising of the solder through the gap 132, and it is possible to electrically connect each capacitor 12 and the circuit board 18 more reliably.

By inserting the engaging protrusions 76 of the lower holder 54 into the engaging holes 120 of the circuit board 18 in a substantially press-fit state, the lower holder 54 is held in a temporarily fixed state, and the

lead insertion holes

66a and 66b and the respective

lead insertion holes

66a and 66b are held. The through holes 118 are positioned in communication with each other. In particular, in this embodiment, a plurality of engaging protrusions 76 and engaging holes 120 are provided, so that the

lead insertion holes

66a and 66b and the through holes 118 can be positioned with high precision. Therefore, these communication states can be stably maintained.

Each locking portion 80 is provided on the lower holder 54, and each locked portion 106 is provided on the upper holder 56. By lock-fitting these locking portions 80 and each locked portion 106, after displacement lower holder 54 is held at the fixed position. As a result, the lower holder 54 can be held at the final fixing position without increasing the number of parts. As a result, the lower holder 54 is not unintentionally displaced to the temporarily fixed position, the gap 132 between the lower holder 54 and the circuit board 18 is stably maintained, and soldering can be confirmed more reliably.

The lower holder 54 has a pressing portion 74 projecting outward in the left-right direction from the circuit board 18 . Further, the circuit board 18 has a through hole 126, and an exposed portion 128 of the lower holder 54 is exposed to the outside through the through hole 126 when the lower holder 54 is in the temporarily fixed position. By applying an external force in the direction of approaching the upper holder 56 to the pressing portions 74 and the exposed portions 128, the lower holder 54 is displaced from the temporarily fixed position to the final fixed position. As a result, an external force can be applied to the lower holder 54 easily and directly, and the displacement of the lower holder 54 can be quickly and stably performed.

Each of the

lead insertion holes

66a and 66b has a tapered surface 68 at its upper portion, and the diameter of each of the

lead insertion holes

66a and 66b gradually decreases forward in the direction in which the

lead portions

34a and 34b are inserted (in the direction from top to bottom). It's like The inner diameter φA of each through hole 118 in the circuit board 18 is smaller than the minimum inner diameter φB of each

lead insertion hole

66a, 66b, and the outer diameter φC of each

lead portion

34a, 34b It is smaller than the minimum inner diameter φB of the

lead insertion holes

66a and 66b. As a result, the

lead portions

34a and 34b are guided by the tapered surface 68 and stably inserted into the

lead insertion holes

66a and 66b. Since the

lead insertion holes

66a and 66b and the through holes 118 are positioned relative to each other, the

lead portions

34a and 34b inserted through the

lead insertion holes

66a and 66b are also stably attached to the through holes 118. and is inserted. That is, by setting the diameters of the

lead insertion holes

66a and 66b, the through holes 118 and the

lead portions

34a and 34b as described above, the

lead insertion holes

66a and 66b in the

lead portions

34a and 34b and the respective Insertion into the through hole 118 can be easily achieved.

Each

lead portion

34a, 34b has an intermediate extension portion 48 between each proximal straight portion 44 and each distal straight portion 52 and connected thereto by first and second

curved portions

46, 50. It has As a result, when an external force is applied to the

soldered lead portions

34a and 34b, or when the

lead portions

34a and 34b are displaced due to temperature changes, the first and second

curved portions

46 , 50, and problems such as solder cracks caused by the displacement of the

lead portions

34a, 34b can be prevented. An intermediate extending portion 48 is provided in each of the pair of

lead portions

34 a and 34 b , and each tip side straight portion 52 is displaced in the same direction with respect to each base end side straight portion 44 . As a result, it is possible to impart directionality around the central axis in each capacitor 12, and when inserting the

lead portions

34a and 34b into the

lead insertion holes

66a and 66b and the through holes 118, for example, one It is possible to prevent the lead portion (+ pole) and the other lead portion (- pole) from being assembled in an inverted state with respect to the normal state.

A bottom wall 58 of the lower holder 54 is provided with a receiving recessed groove 70 continuous from each of the

lead insertion holes

66a and 66b, and can receive the intermediate extending portion 48 of each of the

lead portions

34a and 34b. As a result, interference with the bottom wall 58 can be avoided even when the intermediate extending portions 48 are provided on the

lead portions

34a and 34b. As a result, by providing the first curved portion 46, the intermediate extending portion 48 and the second curved portion 50 on the

lead portions

34a and 34b, the effect of preventing solder cracks and the like can be stably exhibited. In particular, the upper opening of each accommodation groove 70 is provided with a tapered surface 72 so that accommodation of the intermediate extension 48 into each accommodation groove 70 can be guided. As a result, each intermediate extending portion 48 can be easily accommodated in each accommodation recessed groove 70 .

<Modification>
As described above, Embodiment 1 has been described in detail as a specific example of the present disclosure, but the present disclosure is not limited by this specific description. Modifications, improvements, etc. within the scope that can achieve the purpose of the present disclosure are included in the present disclosure. For example, the following modifications of the embodiment are also included in the technical scope of the present disclosure.

(1) The number of capacitors is not limited, and can be changed as appropriate according to the required capacity of the power supply unit. Moreover, when the capacitors are provided across a plurality of columns, the number of columns is not limited to two as in the above embodiment, and may be three or more. In the above-described embodiment, the lower cylindrical housing portions 64 and the upper cylindrical housing portions 96 are provided in the lower holder 54 and the upper holder 56 in a number corresponding to the number of capacitors 12 . There may be more parts or upper cylindrical housing parts than there are capacitors. That is, a lower tubular accommodation portion and an upper tubular accommodation portion into which the capacitors are not inserted may be provided, thereby making it possible to cope with an increase or decrease in the number of capacitors.

(2) In the above embodiment, each of the pair of

lead portions

34a and 34b is provided with an intermediate extending portion 48, and each tip side straight portion 52 is displaced in the same direction with respect to each base end side straight portion 44. However, it is not limited to this aspect. For example, by extending a pair of lead portions so as not to be rotationally symmetrical with respect to the central axis of the capacitor, each lead insertion hole and each through hole is assembled with the positive and negative poles reversed. It is possible to prevent erroneous assembly such as being done. Specifically, for example, one lead portion may be extended straight, and the other lead portion may be extended while being bent into a crank shape as in the above embodiment.

In addition, the intermediate extension does not need to be perpendicular to the proximal side straight portion and the distal side straight portion. Problems such as solder cracks can be prevented by providing a portion that absorbs the displacement by dynamically deforming. It should be noted that each lead portion does not necessarily have a bent portion as described above, and each lead portion may extend straight. Since the length of the lead portion can be reduced by bending the lead portion at right angles as in the portion 48, the size of the capacitor, and thus the capacitor module and the power supply unit can be reduced. Therefore, when the intermediate extension is provided, it is preferable that the intermediate extension is orthogonal to the proximal side straight section and the distal side straight section.

(3) In the power supply unit of the present disclosure, the specific structure of the case in which the capacitor module is accommodated is not limited, and for example, the structure of fixing the capacitor module to the case is also not limited.

10 Power supply unit 12 Capacitor 14 Capacitor module 16 Case 18 Circuit board 20 Connector 22 Control board 24 Connector 26 Connector cover 28 Lower case 30 Upper case 32

Capacitor holders

34, 34a, 34b Lead part 36 Capacitor body 38 First end surface 40 Second end surface 42 Diameter reduction portion 44 Base end side straight portion 46 First curved portion 48 Intermediate extension portion 50 Second curved portion 52 Distal side straight portion 54 Lower holder (first holder member)
56 upper holder (second holder member)
58 bottom wall 60 lower peripheral wall 62 lower partition wall 64 lower

cylindrical accommodation portions

66a, 66b lead insertion hole 68 tapered surface 70 accommodation groove 72 tapered surface 74 pressing portion 76 engaging protrusion 78 insertion hole 80 locking portion 82 elastic piece 84 Claw portion 86 Positioning convex portion 88 Concave portion 90 Upper bottom wall 92 Upper peripheral wall 94 Upper partition wall 96 Upper cylindrical housing portion 98 Communication hole 100 Communication window 102 Pressing piece 104 Screwing portion 106 Locked portion 108 Inclined surface 110 Horizontal surface 112 Positioning recess 114 Columnar protrusion 116 Lock protrusion 118 Through hole 120 Engagement hole 122 Lock hole 124 Screw insertion hole 126 Through hole 128 Exposed portion 130 Screw 132 Gap 134 Solder

Claims

a capacitor having a pair of lead portions protruding from the first end surface;
a capacitor holder that holds the capacitor;
a circuit board to which the lead portions of the capacitor are soldered;
The capacitor holder includes a first holder member that holds the first end face side of the capacitor and a second holder member that holds the second end face side of the capacitor facing the first end face,
The first holder member has a bottom wall on which the circuit board is opposed and separated from the second holder member, the bottom wall has a lead insertion hole through which the lead portion is inserted,
The circuit board has a through-hole through which the lead portion inserted through the lead insertion hole of the bottom wall of the first holder member is inserted and soldered, and the first holder member is disposed therebetween. connected to the second holder member,
The first holder member is arranged closer to the circuit board than the second holder member, and extends toward the second holder member from a temporarily fixed position where the lead insertion hole and the through hole are positioned. A power supply unit that can be displaced to a permanent fixing position that is separated from the circuit board and attached to the second holder member.
The first holder member has an engaging protrusion projecting from the bottom wall toward the circuit board, and the engaging protrusion is press-fitted into an engaging hole provided in the circuit board, 2. The power supply unit according to claim 1, wherein said first holder member is positioned on said circuit board and held at said temporarily fixed position.
The lock portion provided on the first holder member is lock-fitted with the locked portion provided on the second holder member, whereby the first holder member is assembled to the second holder member and the book is held. 3. A power supply unit as claimed in claim 1 or claim 2, held in a fixed position.
The first holder member has a pressing portion that protrudes and spreads outward from the outer peripheral edge portion of the circuit board. 4. The power supply unit according to any one of claims 1 to 3, wherein the power supply unit is displaceable from to the final fixing position.
The first holder member has an exposed portion exposed from a through hole provided in the circuit board,
At the temporary fixing position of the first holder member, the first holder member can be displaced from the temporary fixing position to the permanent fixing position by a pressing force applied to the exposed portion through the through hole of the circuit board. A power supply unit according to any one of claims 1 to 4.
The lead insertion hole of the first holder member has a tapered shape that decreases in diameter toward the circuit board, and the minimum diameter of the lead insertion hole is larger than the outer diameter of the lead portion. 6. The power supply unit according to any one of claims 1 to 5, which is smaller than the diameter dimension of the through hole.
Each of the lead portions of the capacitor includes a proximal side straight portion protruding from the first end surface, a first curved portion positioned at a distal end portion of the proximal side straight portion and bent at a right angle, and the first curved portion. a second curved portion positioned at the tip of the intermediate extended portion and bent perpendicularly in the direction opposite to the first curved portion; It has a proximal side straight portion and a distal side straight portion protruding in parallel, and each distal side straight portion of the pair of lead portions is displaced in the same direction with respect to each proximal side straight portion. A power supply unit according to any one of claims 1 to 6.
The bottom wall of the first holder member has an accommodation groove that opens toward the first end surface of the capacitor and into which the intermediate extending portion can be fitted, and the intermediate extending portion of the lead portion. 8. The power supply unit according to claim 7, wherein is fitted in said accommodation groove.