JPH04127636U - Electrolytic capacitor - Google Patents

Abstract

(57) [Summary] [Purpose] To prevent generated gas and electrolyte from scattering to the surrounding area even if the explosion-proof valve operates. [Structure] A transverse throttle groove 12a is formed in the exterior case 12 of an electrolytic capacitor C, and the upper wall surface thereof is deeply constricted at a steep angle. is housed in a bottomed cylindrical safety case 18 so as to create a bottom space B of a predetermined volume, and a second sealing plate having a pair of external terminals 20a and 20b on the opening side of the safety case 18. 19, and a pair of internal lead wires 16a, 16b, at least one of which acts as a fuse wire, is wired between the anode terminal 14a and cathode terminal 14b of the sealing plate 15 of the electrolytic capacitor C and each of the external terminals 20a, 20b. and O-ring 1
At step 7, the inside of the safety case 18 is divided into the bottom space B and the upper space A filled with airtight liquid. [Effect] O-ring deviation is reliably prevented.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention relates to electrolytic capacitors, more specifically aluminum electrolytic capacitors. This relates to a safety device for capacitors.

0002

[Conventional technology]

Aluminum electrolytic capacitors have an anode foil and a cathode foil made of aluminum foil. A capacitor element is made by winding a separator in between and is impregnated with a specified electrolyte. We are prepared. The capacitor element has a bottomed cylindrical outer case made of aluminum, for example. The opening is hermetically closed with a sealing member.

0003 By the way, if a reverse voltage, overvoltage, or excessive temperature is applied to this electrolytic capacitor, If the electrolyte decomposes, internal gas is generated, internal pressure increases, and an explosion occurs. There is a risk. In addition, internal pressure may rise abnormally due to other causes. be.

0004 Therefore, in the past, when the external case reached a specified internal pressure, the internally generated gas was An explosion-proof valve (safety device) is installed to release the gas to the outside.

[0005]

[Problem that the idea aims to solve]

Explosion is prevented by the activation of the explosion-proof valve, but the generated gas blows out It may be mistaken for a set (equipment) fire, causing unnecessary anxiety to the user. . In addition, in some cases, the electrolyte may be scattered around with the generated gas, causing a circuit short circuit. There is also a risk of causing

[0006]

[Means to solve the problem]

This invention was made to solve the above-mentioned conventional drawbacks, and its structural features The capacitor element is housed in a cylindrical outer case with a bottom, and the opening is equipped with an explosion-proof valve. The capacitor element is sealed with a sealing plate having a capacitor element, and is pulled out from the capacitor element. Connect the anode lead and the cathode lead to the anode terminal and cathode terminal provided on the sealing plate. It has an electrolytic capacitor connected to each of the Place the electrolytic capacitor itself into a bottomed cylindrical safety case with the O-ring attached. The safety case is stored so that a predetermined volume of bottom space is created, and the opening of the safety case is A second sealing plate having a pair of external terminals is provided on the side, and the anode terminal and the cathode terminal and each of the above external terminals, a pair of wires, at least one of which acts as a fuse wire, are connected. Wire the internal lead wire and connect the inside of the safety case to the bottom space using the O-ring. In a case that is divided into two parts with an airtight upper space, the horizontal throttle groove of the above-mentioned exterior case is , the inner wall surface on the opening side of the exterior case is almost perpendicular to the axis of the exterior case. This is because it is formed like this.

[0007] In this case, the other internal lead wire is connected to one of the internal leads acting as a fuse wire. It has longer dimensions than the lead wire and is relatively difficult to cut than the fuse wire. It is preferable that the wire be made of a steel wire.

[0008] In addition, a predetermined pressure is applied between the bottom outer surface of the outer case and the bottom inner surface of the safety case. A deformable spacer may be provided.

[0009] Both internal leads are tin or solder plated steel core copper wire (CP wire), yellow. A combination of copper wire, phosphor bronze wire, beryllium copper wire or nickel silver wire is suitable.

0010

[Effect]

If the internal pressure rises for some reason and the explosion-proof valve is activated, the generated gas will hit the explosion-proof valve. The liquid is then ejected into the airtight upper space of the safety case. This allows the upper air The pressure between the electrolytic capacitor and the electrolytic capacitor moves to the bottom side of the safety case.

[0011] This movement pulls the internal lead wire and eventually breaks it. that time, The generated gas is confined within the airtight upper space and does not leak out of the case.

0012 According to this invention, the electrolytic capacitor moves to the bottom side of the safety case as described above. However, the horizontal throttle groove for installing the O-ring is located on the inner wall of the exterior case on the opening side. The surface is formed so that it is almost perpendicular to the axis of the exterior case, so The O-ring does not deviate from the horizontal throttle groove during movement.

[0013]

【Example】

FIG. 1 shows a schematic side sectional view of an electrolytic capacitor according to an embodiment of the present invention. ing. According to the figure, this electrolytic capacitor C has an anode made of, for example, aluminum foil. It includes a capacitor element 10 formed by winding foil and cathode foil with a separator in between. Ru.

[0014] From this capacitor element 10, a ribbon-shaped anode lead 11a and a cathode lead are connected. 11b is pulled out. The capacitor element 10 is impregnated with a predetermined electrolyte. Thereafter, it is housed in an exterior case 12 made of aluminum and having a cylindrical shape with a bottom.

[0015] Inside the exterior case 12, the capacitor element 10 is secured with a suitable fixing agent 13. The opening of the outer case 12 connects the anode terminal 14a and the cathode terminal. It is sealed by a sealing plate 15 having a child 14b.

[0016] In this case, the anode terminal 14a and the cathode terminal 14b are made of aluminum rivets, Inside the case of each terminal 14a, 14b, there is an anode lead 11a and a cathode lead 1. 1b is connected. Moreover, on the outside of the case of each terminal 14a, 14b, for example, a hard Fuse wires 16a and 16b made of steel wire are welded to each other.

[0017] According to this embodiment, one fuse wire 16a has a diameter of 0.3 mm. However, the other fuse wire 16b is thicker and longer than the other fuse wire 16b. The sealing plate 15 is made of a rubber-covered laminate, and an explosion-proof valve 15a is provided approximately in the center of the sealing plate 15. is provided.

[0018] This electrolytic capacitor C has an O-ring 1 in a horizontal throttle groove 12a of its exterior case 12. 7 is installed, a predetermined volume is placed inside the bottomed cylindrical safety case 18. It is stored so that the bottom space B of the product is left.

[0019] In this case, as shown in the enlarged cross-sectional view of FIG. The wall surface 12b, that is, the inner wall surface 12b located on the opening side of the outer case, It is narrowed deeply at a steep angle so as to be almost perpendicular to the axis X-X of the ing.

[0020] In this embodiment, the horizontal throttle groove 12a is originally intended for positioning the sealing plate 15. The O-ring 17 is installed using the horizontal throttle groove 12a. However, in some cases, there is also a dedicated O-ring attachment in addition to the one for positioning the sealing plate. It may be formed as

[0021] The safety case 18 is made of aluminum, for example, and the outer peripheral surface of the O-ring 17 is the same. Its inner diameter is determined so as to be in close contact with the inner surface of the safety case 18. Also, this The upper end opening of the safety case 18 is closed by a second sealing plate 19. the As a result, the inside of the safety case 18 is separated from the upper space A and the bottom space by the O-ring 17. It is airtightly divided into a space B and a space B.

[0022] The second sealing plate 19 has a pair of external terminals, in this embodiment lug type terminals 20a, 2. 0b is provided. In this case, the lug terminals 20a, 20b are preferably handles. consisting of rivets of attachable metal, e.g. copper, each with one fuse wire attached to it. Insertion holes for inserting 6a and 16b are provided.

[0023] That is, each fuse wire 16a, 16b is inserted into its insertion hole and soldered. However, in this example, the length of the other fuse wire 16b is long. Then, it is bent as shown in the figure. Note that the second sealing plate 19 has an upper A rubber-covered laminate similar to the sealing plate 15 is used, and the safety case 1 is secured by caulking. 8 in an airtight manner.

[0024] On the other hand, between the outer surface of the bottom of the outer case 12 and the inner surface of the bottom of the safety case 18, is provided with spacers 21a and 21b. These spacers 21a and 21b are , for example, resin, sponge, paper, metal, etc., but in any case, the Something that deforms with force is used.

[0025] Next, the function of this electrolytic capacitor C will be explained with reference to FIG. First of all, nothing If the internal pressure inside the outer case 12 rises for some reason and the explosion-proof valve 15a is activated, the explosion will occur. Raw gas is ejected into the upper space A of the safety case 18. At this time, the upper space A Since the bottom space B is divided by the O-ring 17, the generated gas Therefore, the pressure in the upper space A of the safety case 18 is reliably increased.

[0026] This moves the electrolytic capacitor C to the bottom side of the safety case 17. Along with this, the spacers 21a and 21b are deformed so as to be crushed, and one side fuse wire 16a is cut. In addition, the generated gas is confined in the upper space A. It will not leak outside.

[0027] As described above, the electrolytic capacitor C moves to the bottom side of the safety case 17. However, the upper wall surface 12b of the horizontal throttle groove 12a is formed deeply with a steep angle. Therefore, there is a possibility that the O-ring 17 will deviate from the horizontal throttle groove 12a as the O-ring 17 moves. That's not it.

[0028] Further, in this embodiment, the other fuse wire 16b is long and thick. Therefore, even if one fuse wire 16a is cut, this fuse wire 16b will remain. It will be. Therefore, this electrolytic capacitor C is safe even after an explosion. It is suspended within the case 18 by the same fuse wire 16b without wobbling. Become.

[0029] Furthermore, in the above embodiment, both the upper space A and the bottom space B are airtight. , the bottom space B may be open to the atmosphere. Also, in some cases The pacer can also be omitted.

[0030]

[Effect of the idea]

As explained above, according to the present invention, the electrolytic capacitor itself is surrounded by O-rinsing. When storing the electrolytic capacitor in the safety case with the electrolytic capacitor attached, The upper wall surface of the case has a deep lateral drawing groove with a steep angle. Installing the O-ring inside the groove reliably prevents the O-ring from coming off. Therefore, the generated gas and electrolyte are not scattered around, and the fuse is We provide electrolytic capacitors equipped with a safety device that ensures reliable operation of disconnecting the power line. can be done.

[Brief explanation of drawings]

FIG. 1 is a schematic side sectional view of an electrolytic capacitor according to an embodiment of the present invention.

FIG. 2 is a schematic side sectional view for explaining the action of the electrolytic capacitor.

FIG. 3 is an enlarged sectional view of a horizontal throttle groove for mounting an O-ring.

[Explanation of symbols]

10 Capacitor element 11a Anode lead 11b Cathode lead 12 Exterior case 12a Aperture groove 12b Upper wall surface 14a Anode terminal 14b Cathode terminal 15 Sealing plate 15a Explosion-proof valve 16a, 16b fuse wire 17 O-ring 18 Safety case 19 Second sealing plate 20a, 20b lug type terminal 21a and 21b are spacers

Claims (1)

[Scope of utility model registration request] Claim 1: A capacitor element is housed in a cylindrical outer case with a bottom, the opening of the capacitor element is sealed with a sealing plate having an explosion-proof valve, and an anode lead and a cathode lead drawn out from the capacitor element are connected to each other. is connected to an anode terminal and a cathode terminal provided on the sealing plate, respectively, and the electrolytic capacitor itself has a bottom with an O-ring installed in the horizontal throttle groove of the exterior case. A cylindrical safety case is housed in such a way that a bottom space of a predetermined volume is created, and a second sealing plate having a pair of external terminals is provided on the opening side of the safety case, and the anode terminal and the cathode terminal are disposed on the opening side of the safety case. A pair of internal lead wires, at least one of which acts as a fuse wire, are wired between the and each of the external terminals, and the O-ring divides the inside of the safety case into the bottom space and the airtight top space. In the electrolytic capacitor, the horizontal throttle groove of the exterior case is formed such that the inner wall surface on the opening side of the exterior case is substantially perpendicular to the axis of the exterior case. .