JP7420643B2 - Mounting structure of power storage device - Google Patents

Description

The present invention relates to a mounting structure for mounting a power storage device to a mounting target.

BACKGROUND ART Power storage devices such as capacitors, capacitors, and storage batteries are used as a unit by attaching a plurality of power storage devices to a mounting target such as a casing as necessary. Patent Document 1 discloses, as a mounting structure for mounting a cylindrical capacitor to a mounting plate (mounting target), a mounting bracket that tightens and fixes the cylindrical portion of a cylindrical capacitor. A stud screw is provided at the center of the bottom of the mounting bracket, and by fixing the bottom of the mounting bracket to the mounting plate with this stud screw, the cylindrical capacitor is mounted on the mounting plate.

Utility Model Publication No. 5-31219

In the above-mentioned mounting structure, while the stud screw itself can be firmly fastened, the mounting fitting itself has only the strength of a general fitting. Therefore, the bottom of the cylindrical capacitor cannot obtain sufficient contact surface pressure with the mounting plate, and heat transfer from the cylindrical capacitor to the mounting plate is low. On the other hand, for general stud bolts that are installed integrally with the metal case of a power storage device, there is no need to consider the strength of the metal fittings, but there is no need to take the strength of the metal fittings into account, but there is a possibility that the metal case and internal elements may come into contact or the metal case and internal elements may come into contact with each other via electrolyte. Since the stud bolts are electrically connected and have a negative potential, or the insulation between the metal case and the internal elements is low, it is necessary to maintain insulation between the stud bolts and the object to which they are attached.

An object of the present invention is to provide a mounting structure for a power storage device that has excellent heat dissipation while maintaining insulation between the power storage device and an attachment target.

The power storage device mounting structure of the present invention is a mounting structure for mounting the power storage device to an attachment target, and is provided integrally with the case of the power storage device, and is erected at the bottom of the power storage device. and a stud bolt that is inserted into a mounting hole provided in the mounting target and has an insulating property and is arranged on the opposite side of the power storage device with the mounting target sandwiched therebetween, and the stud bolt is inserted into a mounting hole provided in the mounting target. A pad is formed with a through hole that is inserted so as to protrude on the side opposite to the attachment target, and a threaded portion is formed, so that the attachment target and the pad are sandwiched between the bottom of the electricity storage device. A tightening member attached to the stud bolt. The pad has a portion that contacts the mounting member and a portion that faces the mounting hole, and includes a main body that contacts the tightening member, and a main body that is provided on the tightening member side of the main body. and a ring-shaped outer edge portion extending in a direction away from the attachment target, and a protrusion provided in a portion of the main body portion facing the attachment hole, protruding toward the power storage device side, and surrounding the through hole. have.

According to this configuration, the stud bolt inserted into the through hole formed in the pad protrudes on the side opposite to the power storage device across the attachment target. Therefore, the stud bolt can be exposed to the outside air directly or through the tightening member. Therefore, heat dissipation can be improved. Further, the outer edge portion disturbs the airflow in the direction along the surface to which the pad is attached around the pad, and air is caught around the tightening member. Therefore, heat dissipation can be further improved. Further, the stud bolt is electrically connected to the cathode together with the case of the power storage device, or has a low insulation property. The protrusion provided on the insulating pad can prevent the stud bolt from coming into contact with the object to be mounted, and the outer edge can increase the creepage distance from the tightening member to the object to be mounted. , it is possible to reliably insulate between the stud bolt and the object to be attached. Therefore, insulation between the electricity storage device and the object to which it is attached can be maintained.

Further, in the above-described mounting structure for a power storage device, the pad has two of the protrusions spaced apart in a direction perpendicular to the axial direction of the stud bolt, and is disposed between the two protrusions, and The power storage device further includes an annular elastic body that contacts the bottom of the power storage device.

According to this configuration, the annular elastic body can close the space between the stud bolt and the object to be attached, so that the stud bolt and the object to be attached can be reliably insulated.

Furthermore, in the above-described mounting structure for the power storage device, the protrusion contacts the bottom of the power storage device.

According to this configuration, the space between the stud bolt and the object to be attached can be closed by the protrusion, so that the stud bolt and the object to be attached can be reliably insulated.

In addition, in the above-described mounting structure for the power storage device, the pad is provided radially around the through hole and has a plurality of gussets connecting the main body portion and the outer edge portion.

According to this configuration, deformation of the main body can be suppressed by the gusset, and the tightening member can be received like a washer. Therefore, the bottom of the electricity storage device can be directly fastened to the attachment target using the recommended tightening torque of the stud bolt. This increases the contact surface pressure between the bottom surface of the power storage device and the attachment target, and further improves heat dissipation.

Moreover, in the above-described mounting structure for the power storage device, the tightening member has a fin.

According to this configuration, the tightening member can directly receive heat from the stud bolt and efficiently radiate the heat to the outside air using the fins. Therefore, heat dissipation can be further improved.

Further, in the above-described mounting structure for the power storage device, the tightening member is made of metal.

According to this configuration, it is possible to improve heat transfer from the stud bolt to the tightening member, and therefore it is possible to further improve heat dissipation.

According to the present invention, it is possible to obtain a mounting structure for a power storage device that has excellent heat dissipation while maintaining insulation between the power storage device and an attachment target.

FIG. 2 is a diagram showing a state in which an electrolytic capacitor is attached to an attachment target using the attachment structure according to an embodiment of the present invention. 2 is a schematic cross-sectional view of the electrolytic capacitor shown in FIG. 1. FIG. FIG. 2 is an exploded perspective view of a mounting structure for mounting the electrolytic capacitor shown in FIG. 1 to a mounting target. 4 is a schematic cross-sectional view of the mounting structure shown in FIG. 3. FIG. It is a perspective view which shows the pad of FIG. 3, (a) is a perspective view from above, (b) is a perspective view from below. 4A and 4B are diagrams showing the pad of FIG. 3, in which (a) is a top view, (b) is a side view, and (c) is a bottom view. It is a figure which shows the trajectory line in the periphery of a mounting structure. It is a schematic sectional view of the attachment structure concerning the 1st modification. It is a schematic sectional view of the attachment structure concerning the 2nd modification.

Hereinafter, a preferred embodiment of the present invention will be described with reference to the drawings.

A mounting structure 1 according to the present embodiment is for mounting an electrolytic capacitor 2 (power storage device) to a mounting target 10. In this embodiment, as shown in FIG. 1, the electrolytic capacitor 2 is attached to a mounting surface 10a, which is a horizontal surface facing upward of a mounting target 10.

As shown in FIGS. 1 to 3, the electrolytic capacitor 2 has a substantially cylindrical shape, and a pair of terminal portions 21 are provided at one end in the axial direction. A stud bolt 22 is erected at the end of the electrolytic capacitor 2 opposite to the side where the terminal portion 21 is provided. In the electrolytic capacitor 2, the stud bolt 22 is inserted into a circular mounting hole 10c provided in the mounting target 10, and the end on the side where the stud bolt 22 is provided is in contact with the mounting surface 10a of the mounting target 10. Then, it is attached to the attachment target 10. In the following description, the end of the electrolytic capacitor 2 on the side where the stud bolt 22 is provided will be referred to as the "bottom".

Electrolytic capacitor 2 is an aluminum electrolytic capacitor. As shown in FIG. 2, the electrolytic capacitor 2 includes a capacitor element 23 in which an anode foil and a cathode foil made of aluminum foil are wound through a separator, and a bottomed cylindrical aluminum case 24 that houses the capacitor element 23. It mainly includes a synthetic resin sealing body 25 that seals the open end of the case 24, and a sleeve 26 that is made of an insulating material and covers the outer surface of the case 24. The capacitor element 23 is impregnated with a driving electrolyte. By wetting the space between the capacitor element 23 and the case 24 with the electrolyte, the case 24 and the cathode are electrically connected. A pair of terminal portions 21 are drawn out from the anode foil and the cathode foil, respectively, and are drawn out from the inside of the case 24 through a through hole 25a formed in the sealing body 25.

The stud bolt 22 is provided integrally with the case 24. That is, the stud bolt 22 is made of the same aluminum as the case 24 and is manufactured integrally with the case 24, so that the stud bolt 22 and the case 24 are electrically connected to the cathode. Stud bolt 22 extends along the axial direction of electrolytic capacitor 2 . The stud bolt 22 is provided at the center of the bottom of the electrolytic capacitor 2 .

As shown in FIGS. 3 and 4, the mounting structure 1 includes a stud bolt 22 provided on an electrolytic capacitor 2, a pad 3 made of an insulating material such as resin, and a space between the bottom of the electrolytic capacitor 2 and the pad 3. It mainly includes an annular elastic body 4 made of elastomer or metal such as butyl rubber, ethylene propylene terpolymer, silicone, etc. and a nut (tightening member) 5 made of metal such as iron with a threaded portion 51 formed therein. .

Next, the structure of the pad 3 will be described with further reference to FIGS. 5(a) and 5(b) and FIGS. 6(a) to 6(b). The pad 3 is placed on the opposite side of the attachment target 10 from the electrolytic capacitor 2, that is, when the electrolytic capacitor 2 is placed above the attachment target, the pad 3 is positioned below the attachment target 10. The pad 3 is formed with a through hole 3a through which the stud bolt 22 is inserted. As shown in FIG. 4, the stud bolt 22 inserted into the through hole 3a of the pad 3 penetrates to the side opposite to the attachment target 10, that is, to the downward side.

The pad 3 is made of an insulator such as resin or ceramics, and as shown in FIG. two protrusions 32 a and 32 b that respectively protrude from the upper surface of the main body 31 toward the electrolytic capacitor 2 side (upper side); and a gusset 34 connecting the outer edge portion 33 and the outer edge portion 33.

At the center of the main body portion 31, the above-mentioned through hole 3a is formed. The outer peripheral edge of the upper surface of the main body portion 31 contacts the back surface 10b of the attachment target 10, which is opposite to the attachment surface 10a. The portion of the upper surface of the main body portion 31 other than the portion that contacts the back surface 10b of the attachment target 10 faces the attachment hole 10c (faces the internal space of the attachment hole 10c). The edge of the through hole 3a on the lower surface of the main body portion 31 contacts the nut 5.

The two protrusions 32a and 32b are provided on the upper surface of the main body portion 31 at a portion facing the attachment hole 10c of the attachment target 10, and surround the through hole 3a. As shown in FIG. 6(a), the outer edges of the two protrusions 32a and 32b both have a circular shape when viewed from above. The two protrusions 32a and 32b are both concentric annular shapes and have different diameters. That is, the two protrusions 32a and 32b are separated from each other in a direction perpendicular to the axial direction of the stud bolt 22. As for the two protrusions 32a and 32b, the diameter of the protrusion 32a is larger than the diameter of the protrusion 32b. Further, the diameters of the protrusions 32a and 32b are both smaller than the diameter of the attachment hole 10c.

The lengths from the top surface of the main body portion 31 to the tips of the protrusions 32a and 32b are both smaller than the thickness of the attachment target 10. That is, in this embodiment, the tips of the protrusions 32a, 32b do not contact the bottom of the electrolytic capacitor 2.

The outer edge portion 33 extends downward from the outer peripheral edge portion on the lower surface of the main body portion 31 (on the nut 5 side). The outer edge portion 33 is provided over the entire circumference of the outer peripheral edge portion of the main body portion 31 .

The gusset 34 connects the lower surface of the main body portion 31 and the inner side wall of the outer edge portion 33, as shown in FIGS. 5(b) and 6(c). The plurality of gussets 34 are provided radially around the through hole 3a.

The annular elastic body 4 is arranged between two protrusions 32a and 32b protruding from the upper surface of the main body part 31. That is, the ring diameter of the annular elastic body 4 is smaller than the diameter of the protrusion 32a and larger than the diameter of the protrusion 32b, and is located within the attachment hole 10c of the attachment target 10. The wire diameter or thickness of the annular elastic body 4 is slightly larger than the thickness of the attachment target 10 and contacts the bottom of the electrolytic capacitor 2 . When the pad 3 is tightened with the nut 5, the annular elastic body 4 is sandwiched between the bottom of the electrolytic capacitor 2 and the main body 31 of the pad 3 in the mounting hole 10c, and is elastically deformed over the entire circumference. Thereby, the annular elastic body 4 comes into close contact with the bottom of the electrolytic capacitor 2. The annular elastic body 4 may be bonded to the pad 3 in advance with an adhesive or the like, or may be placed between the two protrusions 32a and 32b of the pad 3 when the electrolytic capacitor 2 is attached.

The annular elastic body 4 closes the space between the stud bolt 22 and the attachment target 10 (inner wall of the attachment hole 10c). That is, as shown in FIG. 4, the internal space of the mounting hole 10c is divided by the annular elastic body 4 into an inner space on the stud bolt 22 side and an outer space on the mounting object 10 side, and the stud bolt 22 and the mounting object 10 are separated from each other. 10 is insulated.

The nut 5 is attached to a portion of the stud bolt 22 inserted into the through hole 3a of the pad 3 that penetrates downward. The nut 5 is attached to the stud bolt 22 so as to sandwich the attachment target 10 and the main body 31 of the pad 3 between the nut 5 and the bottom of the electrolytic capacitor 2 . The metal nut 5 is electrically connected to the cathode along with the case 24 (see FIG. 2) and the stud bolt 22 of the electrolytic capacitor 2, but is insulated by forming a sufficient creepage distance by the outer edge 33 of the pad 3. .

Here, as can be seen from the trajectory shown in FIG. 7, the airflow in the direction along the back surface 10b of the attachment target 10 around the pad 3 is disturbed by the outer edge portion 33. As the airflow is disturbed by the outer edge 33, air is drawn around the nut 5. This facilitates heat radiation from the nut 5.

As described above, the mounting structure 1 for the electrolytic capacitor 2 of the present embodiment is provided integrally with the case 24 of the electrolytic capacitor 2, is erected at the bottom of the electrolytic capacitor 2, and is attached to the mounting target 10. The stud bolt 22 is inserted into the provided mounting hole 10c, and the stud bolt 22 has an insulating property and is placed on the opposite side of the mounting target 10 from the electrolytic capacitor 2. The pad 3 is formed with a through hole 3a that is inserted so as to protrude from the opposite side, and a threaded portion 51 is formed. A metal nut 5 attached to the bolt 22 is provided. The pad 3 has a through hole 3a formed therein, a portion that contacts the attachment target 10, and a portion that faces the attachment hole 10c. It is provided on the nut 5 side, and is provided on the annular outer edge portion 33 extending in the direction away from the attachment target 10, and on the portion facing the mounting hole 10c of the main body portion 31, protruding toward the electrolytic capacitor 2 side, and penetrating. It has annular projections 32a, 32b surrounding the hole 3a, and an annular elastic body 4 disposed between the projections 32a, 32b.

According to the above-described configuration, the stud bolt 22 inserted into the through hole 3a formed in the pad 3 protrudes on the side opposite to the attachment target 10. Therefore, the stud bolt 22 can be exposed to the outside air directly or via the metal nut 5. Therefore, heat dissipation can be improved. Further, the outer edge portion 33 disturbs the airflow in the direction along the surface of the attachment target 10 around the pad, and air is drawn around the nut 5. Therefore, heat dissipation can be further improved. Further, the stud bolt 22 and the nut 5 are electrically connected to the cathode together with the case 24. Since the annular protrusions 32a and 32b provided on the insulating pad 3 can prevent the stud bolt 22 and the mounting object 10 from coming into contact with each other, the stud bolt 22 and the mounting object 10 can be insulated. I can do it. Furthermore, since the outer edge portion 33 can increase the creepage distance from the nut 5 to the attachment target 10 (see the arrow shown in FIG. 4), it is possible to reliably insulate between the nut 5 and the attachment target 10. . Therefore, insulation between the electrolytic capacitor 2 and the attachment target 10 can be maintained.

In the mounting structure 1 for the electrolytic capacitor 2 of this embodiment, the pad 3 has two protrusions 32a and 32b spaced apart in a direction orthogonal to the axial direction of the stud bolt 22. The annular elastic body 4 is disposed between the two protrusions 32a, 32b, and contacts the bottom of the electrolytic capacitor 2 as well as the protrusions 32a, 32b. Therefore, the space between the stud bolt 22 and the attachment target 10 can be closed by the annular elastic body 4, so that the stud bolt 22 and the attachment target 10 can be reliably insulated.

In the mounting structure 1 for the electrolytic capacitor 2 of this embodiment, the pad 3 is provided radially around the through hole 3 a and has a plurality of gussets 34 connecting the main body 31 and the outer edge 33 . Therefore, the gusset 34 can suppress deformation of the main body part 31, and the metal nut 5 can be received like a washer. Therefore, the bottom of the electrolytic capacitor 2 can be directly fastened to the attachment target 10 with the recommended tightening torque of the stud bolt 22. This increases the contact surface pressure between the bottom surface of the electrolytic capacitor 2 and the attachment target 10, and further improves heat dissipation.

Although the embodiments of the present invention have been described above based on the drawings, the specific configuration is not limited to these embodiments. The scope of the present invention is indicated by the claims rather than the description of the embodiments described above, and includes all changes within the meaning and range equivalent to the claims.

In the above-described embodiment, the annular elastic body 4 that contacts the bottom of the electrolytic capacitor 2 is arranged between two annular projections 32a and 32b that are provided on the pad 3 and protrude toward the electrolytic capacitor 2. Although described above, the invention is not limited thereto. That is, the annular elastic body 4 may not be arranged. If the annular elastic body 4 is not provided, only one of the protrusions 32a and 32b may be provided.

Further, as shown in FIG. 8, in the mounting structure 101 according to the first modification of the above-described embodiment, an annular projection 132 that contacts the bottom of the electrolytic capacitor 2 is provided on the upper surface of the main body 131 of the pad 103. It is provided. The length from the top surface of the main body portion 131 to the tip of the protrusion 132 is slightly longer than the thickness of the attachment target 10. Therefore, the tip of the protrusion 132 comes into contact with the bottom of the electrolytic capacitor 2 . Then, by tightening the nut 5, the protrusion 132 is elastically deformed over the entire circumference and comes into close contact with the bottom of the electrolytic capacitor 2. Therefore, in this mounting structure 101, the space between the stud bolt 22 and the mounting object 10 can be closed by the protrusion 132, and similarly to the above embodiment, the space between the stud bolt 22 and the mounting object 10 can be securely closed. can be insulated.

Although the above-mentioned embodiment explained the case where the nut 5 was used, it is not limited to this. That is, as shown in FIG. 9, a mounting structure 201 according to the second modification of the above-described embodiment includes a tightening member 205 having fins 252 instead of the nut 5. The tightening member 205 has a threaded portion 251 formed on the inner peripheral surface of a cylindrical tube portion 255 . The fins 252 are provided on the outer peripheral surface of the cylindrical portion 255. The fins 252 are made of metal such as iron or aluminum. The fins 252 have a flat plate shape with surfaces parallel to both the axial direction and the direction perpendicular to the axial direction, and are provided in plural in the circumferential direction of the cylindrical portion 255. In such a mounting structure 201, the tightening member 205 can directly receive heat from the stud bolt 22 and efficiently radiate the heat to the outside air by the fins 252. Therefore, heat dissipation can be further improved.

In the embodiment described above, a case has been described in which the pad 3 has a plurality of gussets 34 connecting the main body portion 31 and the outer edge portion 33, but the gussets 34 may not be provided.

In the above-described embodiment, a case has been described in which the outer edges of the two protrusions 32a and 32b have a circular shape when viewed from above, but the present invention is not limited to this. The protrusions 32a, 32b may have any shape as long as they surround the through hole 3a, and may have a polygonal shape such as a quadrangular shape when viewed from above.

In the above-described embodiment, a case has been described in which the electrolytic capacitor 2 is attached to a horizontal surface facing upward of the attachment target 10, but the present invention is not limited to this. That is, for example, the electrolytic capacitor 2 may be mounted on a vertical surface.

In the above-described embodiment, the mounting structure 1 for mounting the electrolytic capacitor 2 having a substantially cylindrical shape to the mounting target 10 has been described, but the present invention can be applied to all electricity storage devices including capacitors and storage batteries. The shape of the power storage device is not limited to a cylindrical shape, and may be a columnar shape having a polygonal cross-sectional shape, such as a prismatic shape.

1 Mounting structure 2 Electrolytic capacitor (power storage device)
3 Pad 3a Through hole 4 Annular elastic body 5 Nut (tightening member)
10 Mounting target 10c Mounting hole 22 Stud bolt 24 Case 31 Main body 32a, 32b Projection 33 Outer edge 34 Gusset 51 Threaded part 252 Fin

Claims (6)

A mounting structure for attaching an electricity storage device to an attachment target,
a stud bolt that is provided integrally with a case of the electricity storage device, stands upright at the bottom of the electricity storage device, and is inserted into a mounting hole provided in the attachment target;
A through-hole is formed, which has insulating properties and is disposed on the opposite side of the power storage device across the attachment target, and through which the stud bolt is inserted so as to protrude to the side opposite to the attachment target. pad and
a tightening member having a threaded portion and attached to the stud bolt so as to sandwich the attachment target and the pad between the tightening member and the bottom of the electricity storage device;
The pad is
a main body portion that has a portion that contacts the attachment target and a portion that faces the attachment hole, and that contacts the tightening member;
an annular outer edge portion provided on the tightening member side of the main body portion and extending in a direction away from the attachment target;
A mounting structure for a power storage device, comprising: a protrusion that is provided in a portion of the main body portion facing the mounting hole, projects toward the power storage device, and surrounds the through hole. The pad has two protrusions spaced apart in a direction perpendicular to the axial direction of the stud bolt,
The mounting structure for an electricity storage device according to claim 1, further comprising an annular elastic body disposed between the two protrusions and in contact with a bottom of the electricity storage device. The mounting structure for a power storage device according to claim 1, wherein the protrusion contacts a bottom portion of the power storage device. 4. The pad according to claim 1, wherein the pad is provided radially around the through hole and has a plurality of gussets connecting the main body portion and the outer edge portion. Mounting structure of the electricity storage device described in . The mounting structure for an electricity storage device according to any one of claims 1 to 4, wherein the tightening member has a fin. The mounting structure for an electricity storage device according to any one of claims 1 to 5, wherein the tightening member is made of metal.

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