JPH054460U - Electrolytic capacitor - Google Patents

Abstract

(57) [Summary] [Purpose] In an electrolytic capacitor in which the inner case housing the capacitor element is housed in the outer case and the outer case is airtightly divided, the inner case tilts due to external vibration. The purpose of the present invention is to provide an electrolytic capacitor which is held so as not to come into contact. [Structure] An outer case 3 having a bottomed cylinder whose upper opening is airtightly closed by a sealing body 10, and an upper opening is airtightly closed by a sealing body 4 having an explosion-proof valve 5, and a capacitor element 6 is provided inside. In an electrolytic capacitor in which a bottomed cylindrical inner case 2 in which is accommodated is accommodated, and an upper space A of the inner case in which the explosion-proof valve is located is airtightly divided, an inner peripheral wall of the outer case One or more annular protrusions 13 projecting toward the inner case and holding the inner case,
13a is provided.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

  The present invention relates to an electrolytic capacitor, and more particularly to a safety device for an electrolytic capacitor.

[0002]

[Prior art]

  For example, an aluminum electrolytic capacitor has a cylindrical outer casing made of aluminum. The capacitor element is housed in the case. Anode foil and cathode foil, which are made of aluminum foil, are wound with a separator sandwiched between them and impregnated with an electrolytic solution. Therefore, the opening of the outer case is hermetically closed by the sealing body.   If a reverse voltage, overcurrent or excessive temperature is applied to the electrolytic capacitor, the Gas may be generated due to decomposition of the lysate, and the internal pressure may rise, resulting in an explosion.   For this reason, an explosion-proof valve is provided in the outer case and the sealing body to keep the internal pressure above the specified level. When it rises, it releases the generated gas.   However, when the explosion-proof valve was activated, the gas that was ejected was mistaken for a device fire and It may give the user of the vessel an uncomfortable feeling, and in some cases, the electrolyte may accompany the gas. There is also a risk of scattering around and short-circuiting the circuit.

[0003]   Therefore, for example, as shown in FIG. A method of putting the partial case 20 in a larger outer case 30 is adopted. The capacitor element 21 is housed in the inner case 20, and the capacitor element 21 is fixed. It is fixed by the fixed agent 22. 23 is a sealing body, 24 is an internal terminal, and 25 is an explosion-proof valve. Is.   On the other hand, the opening of the outer case 30 as a safety case is also airtight due to the sealing body 31. The external terminal 32 and the rivet 26 of the inner case 20 with a lead wire. It is connected by 33 and 33a. One of the lead wires 33 is a material that can be easily cut. The other lead wire 33a is longer and harder to cut than the other. It is composed of Support the inner case 20 from below in the outer case 30. A deformable spacer 34 made of paper or resin is arranged in the An O-ring 35 is provided between the outer portion and the inner portion of the outer case 30 so that the outer casing The space in the space 30 is hermetically divided into an upper space A and a lower space B. is doing.

[0004]   For some reason, the internal pressure in the inner case 20 rises and the explosion-proof valve 25 operates. When the generated gas or electrolyte is ejected from the explosion-proof valve 25, the pressure in the upper space A rises. The lead wire 33 is cut, and the inner case 20 is pushed downward as shown in FIG. The spacer 34 is compressed and deformed. As the upper space A expands in this way Prevents the generated gas and electrolyte from being ejected out of the outer case 30 due to the absorption of pressure. To be done. The lead wire 33a is not cut, and the inner case 20 after movement is unstable. Suspend without making a rattling noise.

[0005]

[Problems to be solved by the device]

  During normal times, the inner case 20 has an O-ring 35 and a spacer 34 so that the outer case is The O-ring is retained in the inner ring 30, but is vibrated from the outside. When 35 is removed and the inner case 20 is tilted, the operability of the capacitor element 21 is impaired. It was a cause.

[0006]   According to the present invention, the inner case is housed in the outer case, and the outer case is airtightly divided. In an electrolytic capacitor, the inner case is tilted due to external vibration. For the purpose of providing an electrolytic capacitor that is retained so that it does not There is.

[0007]

[Means for Solving the Problems]

  To this end, in the present invention, the upper opening is hermetically closed by a sealing body. The upper opening is airtight due to the sealing body with the explosion-proof valve A cylindrical inner case with a bottom that is internally closed and contains the capacitor element inside. The upper space of the inner case, where the explosion-proof valve is located, is airtightly divided. In the case of the electrolytic capacitor, the inner case of the outer case projects toward the inner case. A structure is provided so that one or more annular protrusions for holding the output inner case are provided. I made it.   Also, at least one of the protrusions provided on the entire circumference of the outer case and the inner case A sealing member for airtightly partitioning the space inside the outer case is placed between Or at least one of the protrusions on the entire circumference of the outer case Airtightly seals the space inside the outer case by entering the recess provided all around the inner case You may make it a sealed division.

[0008]

[Action]

  During normal times, the inner case that houses the capacitor element should be the sealing member and / or Is held by the protruding part, and the inner case may tilt even if there is external vibration. There is no such thing.   For some reason, the internal pressure in the inner case rises and the explosion-proof valve When raw gas or electrolyte is ejected from the explosion-proof valve, the pressure in the upper space where the explosion-proof valve is located is increased. The force increases and the inner case moves toward the other space while being guided by the protrusion. Therefore, the upper space where the explosion-proof valve is located expands, the pressure is absorbed, and the generated gas and It is possible to prevent the electrolytic solution from jetting out of the outer case.

[0009]

【Example】

  1, an electrolytic capacitor 1 according to the present invention includes an inner case 2 and an inner case 2. An outer case 3 in which the base 2 is housed. Inner case 2 is aluminum It is made of tubular material with a bottom and the upper opening is hermetically closed by the sealing body 4, and the sealing body 4 is made of rubber. An explosion-proof valve 5 is provided near the center of the laminated laminated plate. Inner case 2 The capacitor element 6 is housed inside, and the capacitor element 6 is made of aluminum foil. A positive electrode foil and a negative electrode foil each consisting of a separator sandwiched and wound, and impregnated with an electrolytic solution Then, it is fixed in the inner case 2 by the fixing agent 7. 8 is an internal terminal, 9 is a rib It is.

[0010]   On the other hand, the outer case 3 as a safety case is also made of aluminum and has a cylindrical shape with a bottom and an upper part. The opening is hermetically closed by a sealing body 10 made of a rubber-clad laminate, and the external terminal 1 1 and the rivet 9 of the inner case 2 are connected by a lead wire 12 which can be easily cut. Has been continued. As the lead wire, tin or solder-plated steel core copper wire, brass wire, A suitable combination is a bronze wire, beryllium copper wire or nickel silver wire. External case 3 A lateral throttle is inserted in the peripheral wall of the and protrudes toward the inner case 2 to hold the inner case. Parts 13 and 13a are provided. This protruding part is formed around the entire circumference of the outer case 3 peripheral wall. It is preferably provided in the shape of a circle. The internal case corresponding to the location of the upper protrusion 13 A recess 14 is provided at the location of the spacer 2, and a rubber member is provided between the recess 14 and the protrusion 13. A sealing member 15 made of an O-ring made of metal is placed, and the inner case inside the outer case 3 is arranged. Spaces other than 2 are airtightly divided into an upper space A and a lower space B.

[0011]   The inner case 2 in which the capacitor element 6 is normally housed has an elastic seal. The inner case is held by the vibrations of the outside, which is held by the framing member 15 and the protrusions 13 and 13a. S2 does not tilt.   Now, for some reason, the internal pressure in the inner case 2 rises and the explosion-proof valve 5 operates. When the generated gas or electrolyte is ejected from the explosion-proof valve 5, the pressure in the upper space A increases and both The other lead wire 12 is cut, and the inner case 2 is pushed down. Therefore above The partial space A expands, the pressure is absorbed, and the generated gas or electrolytic solution is jetted out of the outer case 3. Is prevented.   As the sealing member 15, not only rubber but also plastic having elasticity may be used. The shape is not limited to the O-ring.   Also, as in the conventional example, one of the lead wires 12 may be lengthened or one of them may be difficult to cut. A deformable spacer that supports the inner case below the inner case 2 You may arrange it. The lower space B does not need to be airtight and is open to the atmosphere. May be

[0012]   In the electrolytic capacitor of FIG. 2, a sealing member such as a rubber O-ring is used. Not formed, the protrusion 13b provided on the entire circumference of the inner peripheral wall of the outer case is And is sealed by entering into the concave portion 14 provided on the entire circumference of the outer peripheral wall.

[0013]

[Effect of device]

  In the electrolytic capacitor of the present invention, the internal case in which the capacitor element is housed is normally used. Is securely held in the outer case by the protrusion or through the sealing member Therefore, the internal case does not tilt due to external vibration, and the capacitor element The operability of is not impaired.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of an electrolytic capacitor of the present invention.

FIG. 2 is a sectional view showing another embodiment of the electrolytic capacitor of the present invention.

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

FIG. 4 is a view showing a state in which an explosion-proof valve is activated and an inner case is pushed down in a conventional electrolytic capacitor.

[Explanation of symbols]

1 Electrolytic capacitor 2 inner case 3 external case 4 Sealing body 5 Explosion-proof valve 6 Capacitor element 7 Fixing agent 8 internal terminals 9 rivets 10 Sealing body 11 External terminal 12 lead wire 13 Projection 13a protrusion 13b protrusion 14 recess 15 Sealing member

Claims (3)

[Scope of utility model registration request] 1. A bottomed tubular outer case having an upper opening hermetically closed by a sealing body, the upper opening being hermetically closed by a sealing body having an explosion-proof valve, and a capacitor element being housed inside. In an electrolytic capacitor in which a cylindrical inner case with a bottom is accommodated and the upper space of the inner case where the explosion-proof valve is located is airtightly divided, the inner case is attached to the inner wall of the outer case. An electrolytic capacitor, which is provided with one or a plurality of annular protrusions that protrude to the inside to hold the inner case. 2. A sealing member for airtightly partitioning the space in the outer case is disposed between at least one of the protrusions provided on the entire circumference of the outer case and the inner case. 1. The electrolytic capacitor described in 1. 3. A space inside the outer case is hermetically sealed and divided by at least one of protrusions provided on the entire circumference of the outer case to enter a recess provided on the entire circumference of the inner case. The electrolytic capacitor described in.