JPH1097957A - Method for fixing capacitor element - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fixing method by which the lead-side part of a capacitor element near a sealing plate can be fixed sufficiently and the vibration of the capacitor element housed in a metallic case can be prevented surely. SOLUTION: A capacitor element 2 is fixed by sealing a metallic case 3 housing the element 2 after the case 3 is filled up with element fixing elements 7 (7A and 7B) and moving the agents 7 to the internal surface of a sealing plate 5 on the opened end side of the case 3 and the bottom of the case 3 by rotating the case 3 along an axis nearly perpendicular to the axial direction of the case 3 while the agents 7 have fluidity, and then, solidifying the agents 7.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrolytic capacitor, and more particularly to a method for fixing a capacitor element housed in a metal case of an electrolytic capacitor.

[0002]

2. Description of the Related Art In FIG. 3, reference numeral 2 denotes a capacitor element formed by winding each of an anode foil and a cathode foil through electrolytic paper and winding a resin-made tape 10 around the periphery thereof. The electrolytic capacitor 1 is housed in a cylindrical metal case 3 having a bottom. Reference numeral 4 denotes a lead of the capacitor element 2, and reference numeral 5 denotes a cylindrical sealing plate having an annular step on the outer periphery, and a pair of external terminals (screw terminals) 6 are fixed therethrough. The lead 4 is an external terminal 6 through which a cylindrical sealing plate 5 is inserted.
Is joined to. Reference numeral 7 denotes an element fixing agent that fills a gap between the metal case 3 and the capacitor element 2 so that the capacitor element 2 does not vibrate in the metal case 3. The element fixing agent 7 is filled in a state of being previously melted by heat, such as atactic polypropylene or coal tar, and is cooled and solidified, such as a thermoplastic resin or an epoxy resin or silicone rubber which is melted at room temperature. A thermosetting material which is cured by heat after filling is used.

When the element fixing agent 7 filled in the metal case 3 hardens, a sealing plate 5 is fitted into the open end of the metal case 3.
A rubber 8 having a square ring shape is arranged on the annular step portion of the sealing plate 5. In this state, the opening end of the metal case 3 is swaged to fix the sealing plate 5 to the metal case 3.

[0004]

In a conventional electrolytic capacitor, an element fixing agent is filled in a gap between the metal case and the capacitor element so that the capacitor element does not vibrate in the metal case. When voltage is applied, a hollow air pocket is required inside to reduce the increase in internal pressure due to gasification of the electrolyte impregnated in the capacitor element housed in the metal case. The sealing element is not filled enough, and the air around the sealing plate is a hollow air pocket, so the lead side of the capacitor element cannot be fixed sufficiently. Was desired.

According to the present invention, a capacitor element is filled in the bottom of the metal case 3 by filling an element fixing agent in the gap between the metal case 3 and the capacitor element 2 so that the capacitor element 2 does not vibrate in the metal case 3. To provide a method for fixing a capacitor element that can sufficiently fix the lead-side portion of the capacitor element near the sealing plate and reliably prevent vibration of the capacitor element housed in the metal case. With the goal.

[0006]

According to the present invention, there is provided an electrolytic capacitor in which a capacitor element formed by winding an anode foil and a cathode foil through electrolytic paper is impregnated with an electrolytic solution, and has a bottomed cylindrical metal case. In the method for manufacturing an electrolytic capacitor formed by filling an element fixing agent into the metal case and fitting a sealing plate to an opening end of the metal case, and caulking the opening end of the metal case in this state, In a state where the element fixing agent filled in the metal case has fluidity, the element fixing agent in the state having fluidity is rotated by rotating about an axis substantially perpendicular to the axial direction of the metal case as an axis, and the opening end side of the metal case. Wherein the capacitor element is fixed by moving to the inner surface of the sealing plate and the bottom of the metal case.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings shown in FIGS. FIG. 1 is a cross-sectional view showing an embodiment of the electrolytic capacitor of the present invention, and FIG. 2 is a cross-sectional view showing one example of a manufacturing process of the electrolytic capacitor of the embodiment. 1 and 2, the same reference numerals as those in FIG. 3 indicate the same components. FIG. 2 shows a state in which the electrolytic capacitor 1 is laid on its side from the state of FIG. 3 and rotated about an axis in a direction substantially perpendicular to the axial direction of the metal case 3. In FIG. 2, 7A and 7B are the same as the element fixing agent shown in 7. The metal case 3 employs an explosion-proof structure known in Japanese Utility Model Laid-Open No. 57-37236, which has an explosion-proof groove on the side surface.

When the element fixing agent 7 is a thermosetting material such as epoxy resin or silicon rubber, the gap between the inside of the metal case 3 and the capacitor element 2 is filled in the manufacturing process of the electrolytic capacitor shown in FIG. After that, the sealing plate 5 is fitted into the opening end of the metal case 3 while the element fixing agent 7 has a fluidity without a heat treatment for solidifying the element fixing agent 7. And the sealing plate 5 is fixed to the metal case 3.

In this state, the electrolytic capacitor 1 is formed with the element fixing agent 7 having fluidity, and the electrolytic capacitor 1 is laid on its side. Then, the element fixing agent 7A having fluidity is moved to the inner surface portion of the sealing plate 5 on the opening end side of the metal case 3 by rotating the element fixing agent 7A having a direction substantially perpendicular to the axial direction of the metal case 3 as an axis. Is moved to the bottom surface of the metal case 3 and the electrolytic capacitor is heated while rotating. The thermosetting material is applied to the inner surface of the sealing plate 5 on the opening end side of the metal case 3 and the bottom surface of the metal case 3. The element fixing agents 7A and 7B are hardened.

When the element fixing agent 7 is a thermoplastic material such as atactic polypropylene or coal tar, the electrolytic fixing device 1 is heated by heat treatment with the electrolytic capacitor 1 laid on its side to flow the element fixing agent 7. The metal fixing member 7A is rotated about an intersecting direction substantially perpendicular to the axial direction of the metal case 3 so that the element fixing agent 7A having fluidity can be removed from the inner surface of the sealing plate 5 on the opening end side of the metal case 3 and the fluidity. Is sufficiently moved to the bottom surface of the metal case 3 to cool the electrolytic capacitor while rotating, and the inner surface of the sealing plate 5 at the opening end side of the metal case 3 and the bottom surface of the metal case 3 The element fixing agents 7A and 7B are hardened.

In the present invention, the element fixing agent 7 is placed in the bottomed cylindrical metal case 3 for housing the capacitor element impregnated with the electrolytic solution.
And a sealing plate is fitted into the opening end of the metal case and swaged. If the element fixing agent filled in the metal case has fluidity, the element fixing agent is not solidified, and is rotated around an intersecting direction substantially perpendicular to the axial direction of the metal case as an axis to open the metal case. The element fixing agent having fluidity is moved to the inner surface of the sealing plate on the side and the bottom of the metal case and solidified to fix the capacitor element.

In the case where the element fixing agent is a thermoplastic material, the element fixing agent is heated to make the element fixing agent in a fluid state, and is rotated around an axis in a direction substantially perpendicular to the axial direction of the metal case. The element fixing agent having fluidity is moved to the inner surface portion of the sealing plate on the opening end side of the case and the bottom surface of the metal case to be cooled and solidified, thereby fixing the capacitor element. Thus, the upper and lower sides of the main body including the leads 4 of the capacitor element housed in the metal case are completely fixed, so that the vibration of the capacitor element housed in the metal case is reliably prevented. In the present invention, the metal case employs an explosion-proof structure known in Japanese Utility Model Application Laid-Open No. 57-37236 having an explosion-proof groove on the side surface, and the element fixing agent is hardened on the upper and lower surfaces of the metal case. It was designed not to affect the explosion-proof structure.

[0013]

According to the method for fixing a capacitor element of the present invention, an element fixing agent is filled in a bottomed cylindrical metal case for accommodating a capacitor element impregnated with an electrolytic solution, and a sealing plate is fitted to an opening end of the metal case. The element fixing agent filled in the metal case is made to have fluidity, and is rotated about an intersecting direction substantially perpendicular to the axial direction of the metal case, so that the bottom of the metal case and the sealing plate side of the metal case The element fixing agent moved to was cooled and solidified. As a result, the element fixing agent is hardened on the bottom of the metal case and on the sealing plate side of the metal case, so that the upper and lower sides of the main body including the lead of the capacitor element housed in the metal case are completely fixed. Therefore, the lead-side portion of the capacitor element can be sufficiently fixed, and the capacitor element housed in the metal case can be reliably prevented from vibrating.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of an electrolytic capacitor formed by employing a method for fixing a capacitor element of the present invention.

FIG. 2 is a sectional view showing an example of a manufacturing process of the electrolytic capacitor of FIG.

FIG. 3 is a sectional view showing a conventional electrolytic capacitor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Electrolytic capacitor 2 Capacitor element 3 Metal case 4 Lead 5 Sealing plate 6 External terminal 7 Element fixing agent 7A Element fixing agent 7B Element fixing agent 8 Rubber 10 Anti-winding tape

Claims (1)

[Claims] 1. A capacitor element formed by winding each of an anode foil and a cathode foil through an electrolytic paper is impregnated with an electrolytic solution, accommodated in a cylindrical metal case having a bottom, and has an element fixing agent in the metal case. In the method for manufacturing an electrolytic capacitor formed by filling a sealing plate into the opening end of the metal case and caulking the opening end of the metal case in this state, the element fixing agent filled in the metal case flows. In the state having fluidity, the element fixing agent having fluidity is rotated by rotating about the cross direction substantially perpendicular to the axial direction of the metal case, and the inner surface portion of the sealing plate on the opening end side of the metal case and the bottom surface of the metal case. A method for fixing a capacitor element, wherein the capacitor element is solidified by being moved to a fixed position.