CN216212916U - Electrolytic capacitor of high security - Google Patents

Abstract

The utility model relates to an electrolytic capacitor of high security, it includes electric capacity, inner shell and shell, the inside chamber that holds that is used for installing electric capacity that is equipped with of inner shell, the shell cladding forms the stock solution chamber in the inner shell outside and with the inner shell cooperation, the top of inner shell is provided with the overflow hole that is used for the intercommunication to hold chamber and stock solution chamber, the downthehole eardrum that has withstand voltage upper limit that is provided with of overflow, the eardrum cuts off the overflow hole, institute the grid heat transfer sleeve is installed to the stock solution intracavity, the inboard of grid heat transfer sleeve and the medial surface of outside butt respectively in the lateral surface of inner shell and shell. The present application has the effect of overflowing the electrolyte solution into the reservoir chamber when there is an internal overpressure to avoid splashing into the surrounding circuitry.

Description

Electrolytic capacitor of high security

Technical Field

The present application relates to the field of capacitors, and more particularly, to a high safety electrolytic capacitor.

Background

The electrolytic capacitor is one kind of capacitor, the metal foil is the positive electrode, the oxide film closely attached to the positive electrode is the dielectric, the cathode is composed of conductive material, electrolyte (the electrolyte can be liquid or solid) and other materials, the electrolyte is the main part of the cathode, and the most widely used aluminum electrolytic capacitors are used at present.

In the related art, a case of an electrolytic capacitor is generally provided with an overvoltage switch which is opened when the internal pressure of the case is excessively high, so that an electrolyte or gas is overflowed, thereby preventing the electrolytic capacitor from exploding. However, the inventors have considered that, when such a structure is adopted, since the distance over which the electrolytic solution is sprayed at high speed to the outside at the time of overvoltage is long and wide, the electrolytic solution adheres to the substrate or other electronic parts on which the electrolytic capacitor is mounted, and causes an abnormal phenomenon such as short circuit or electric leakage.

Disclosure of Invention

The present application provides an electrolytic capacitor with high safety in order to spray an electrolyte solution to a surrounding circuit when an internal overvoltage occurs in the capacitor.

The application provides a high-safety electrolytic capacitor, adopts following technical scheme:

the utility model provides an electrolytic capacitor of high security, includes electric capacity, inner shell and shell, the inside chamber that holds that is used for installing electric capacity that is equipped with of inner shell, the shell cladding forms the liquid storage chamber outside the inner shell and with the inner shell cooperation, the top of inner shell is provided with the overflow hole that is used for the intercommunication to hold chamber and liquid storage chamber, the downthehole eardrum that has withstand voltage upper limit that is provided with of overflow, the eardrum overflow cuts off the hole, grid heat transfer sleeve is installed to the liquid storage intracavity, grid heat transfer sleeve's inboard and outside butt respectively in the lateral surface of inner shell and the medial surface of shell.

When the voltage is overloaded or reversely connected, or an excessive current flows due to a life span, a failure, or the like, the temperature of the electrolytic capacitor rises, and at this time, the organic solvent of the electrolyte solution impregnated in the electrolytic capacitor evaporates, or the electrolyte solution is decomposed by heat to generate an evaporation gas, or the electrolyte solution is decomposed by an electrochemical reaction to generate hydrogen or an evaporation gas, and finally the internal pressure of the electrolytic capacitor rises. By adopting the technical scheme, when the internal pressure exceeds the upper pressure limit, the tympanic membrane can be ruptured, and the electrolyte solution can enter the liquid storage cavity through the overflow hole, so that the electrolyte solution is prevented from being sprayed outwards. Because the clearance that has between inner shell and the shell will reduce the heat transfer efficiency of inner shell to shell, consequently set up grid heat transfer sleeve in the stock solution intracavity, grid heat transfer sleeve butt has improved the heat transfer ability of inner casing way shell in inner shell and shell, and simultaneously, the grid in the grid heat transfer sleeve provides the space that holds electrolyte solution.

Preferably, the inner shell and the outer shell are cylindrical shells which are coaxially arranged, and the bottom of the inner shell and the bottom of the outer shell are integrally connected.

By adopting the technical scheme, the integrally formed shape of the inner shell and the outer shell is easy to demould in the production process, the production is convenient, and the grille heat transfer sleeve is sleeved into the liquid storage cavity when the grille heat transfer sleeve is assembled, so that the grille heat transfer sleeve is very convenient.

Preferably, the grid heat transfer sleeve is a conductive sleeve, the inner shell and the outer shell are insulated from the grid heat transfer sleeve, a positive terminal, a negative terminal and a ground terminal are arranged at the bottom of the outer shell, the ground terminal penetrates into the liquid storage cavity to be electrically connected with the grid heat transfer sleeve, and the positive terminal and the negative terminal penetrate into the inner shell and are electrically connected with the capacitor.

By adopting the technical scheme, when the electrolyte solution overflows into the liquid storage cavity, the grid heat transfer sleeve is soaked by the electrolyte solution, and the inside of the capacitor is electrically connected with the grid heat transfer sleeve. Because the ground terminal is connected to the grid heat transfer sleeve, in the event of a capacitor failure, the capacitor will be shorted to ground and stop working.

Preferably, the heat transfer sleeve is composed of a plurality of transverse strips surrounding the inner shell and longitudinal strips connecting the transverse strips, the transverse strips and the longitudinal strips are arranged in a staggered mode, two opposite sides of each longitudinal strip abut against the outer side face of the inner shell and the inner side face of the outer shell, and the thickness of each transverse strip between the inner shell and the outer shell is smaller than that of each longitudinal strip.

Through adopting above-mentioned technical scheme, the vertical strip on the grid heat transfer sleeve is used for connecting and supporting inner shell and shell, and the horizontal strip is used for the increase to connect the heat radiating area who indulges the strip and increase inner shell, because the thickness of horizontal strip between inner shell and shell is less than vertical strip for the electrolyte solution that overflows the stock solution chamber can rely on gravity to flow down naturally in the stock solution intracavity.

Preferably, the inner shell comprises an aluminum shell and an insulating layer covering the outer side surface of the aluminum shell.

Preferably, the insulating layer is insulating paper.

Through adopting above-mentioned technical scheme, the insulating layer can avoid electric capacity during operation and grid heat transfer sleeve to take place the short circuit.

Preferably, the positive terminal, the negative terminal and the ground terminal are fixed on the housing by epoxy resin.

Preferably, the horizontal strips and the vertical strips are copper strips.

By adopting the technical scheme, the copper material has good electric conductivity and heat transfer performance.

In summary, the present application includes at least one of the following beneficial technical effects:

has the effect of overflowing the electrolyte solution into the reservoir chamber during internal overpressure to avoid splashing into the surrounding circuitry.

The capacitor will be cut off when the internal overvoltage occurs, and further damage to the surrounding circuit is avoided.

Drawings

FIG. 1 is a schematic view of an electrolytic capacitor of high safety as a whole in the example of the present application;

fig. 2 is a layered cross-sectional view of a high-safety electrolytic capacitor in the example of the present application.

Description of reference numerals:

1. a capacitor; 2. an inner shell; 21. an aluminum shell; 22. an insulating layer; 23. an accommodating chamber; 24. an overflow aperture; 25. a tympanic membrane; 3. a housing; 31. a liquid storage cavity; 4. a grid heat transfer sleeve; 41. a horizontal bar; 42. longitudinal strips; 5. a positive terminal; 6. a negative terminal; 7. and a ground terminal.

Detailed Description

The present application is described in further detail below with reference to figures 1 and 2.

The embodiment of the application discloses an electrolytic capacitor with high safety. Referring to fig. 1 and 2, the electrolytic capacitor includes a capacitor 1, an inner case 2, and an outer case 3, which are sequentially disposed from the inside to the outside.

The inner casing 2 and the outer casing 3 are both cylindrical shells, and in the present embodiment, the inner casing 2 and the outer casing 3 are both made of an aluminum material. The bottom of the inner casing 2 is fixed to the bottom of the outer casing 3 and integrally connected, and the top surfaces of the inner casing 2 and the outer casing 3 are additionally added at a later stage and encapsulated. When production, drawing of patterns can be conveniently carried out to the inner shell 2 and the shell 3 of body coupling, and production efficiency is high, and the interior outer shell 3 of body coupling is for the interior outer shell 3 of separation, more is favorable to the equipment in later stage. In addition, the outer shell 3 sets up with the inner shell 2 is coaxial and the internal diameter of outer shell 3 is greater than the external diameter of inner shell 2, and the inner chamber height of outer shell 3 is greater than the height of inner shell 2, and outer shell 3 cladding forms stock solution chamber 31 outside inner shell 2 and with the cooperation of inner shell 2, and stock solution chamber 31 is around the side and the top surface in inner shell 2.

The inside of inner shell 2 is provided with and holds chamber 23, and electric capacity 1 installs in holding chamber 23. The inner casing 2 includes an aluminum casing 21 and an insulating layer 22 covering an outer side surface of the aluminum casing 21, and preferably, the insulating layer 22 is insulating paper. The top of inner shell 2 is provided with the overflow hole 24 that is used for the intercommunication to hold chamber 23 and stock solution chamber 31, and in this embodiment, overflow hole 24 is the round hole. A tympanic membrane 25 having an upper pressure limit is disposed in the overflow hole 24, and the tympanic membrane 25 blocks the overflow hole 24. In the embodiment, the tympanic membrane 25 is a corrosion-resistant plastic membrane, and when the internal pressure exceeds the upper pressure limit, the tympanic membrane 25 will be burst, and the electrolyte solution will enter the liquid storage chamber 31 through the overflow hole 24, thereby preventing the electrolyte solution from being sprayed out.

The grill heat transfer sleeve 4 is an electrically conductive sleeve, and the inner casing 2 and the outer casing 3 are insulated from the grill heat transfer sleeve 4. The heat transfer grid sleeve 4 is composed of a plurality of transverse strips 41 surrounding the inner shell 2 and longitudinal strips 42 connecting the transverse strips 41, the transverse strips 41 and the longitudinal strips 42 are arranged in a staggered mode, two opposite sides of each longitudinal strip 42 are abutted to the outer side face of the inner shell 2 and the inner side face of the outer shell 3, and the thickness of each transverse strip 41 between the inner shell 2 and the outer shell 3 is smaller than that of each longitudinal strip 42. In the present embodiment, the longitudinal bars 42 and the transverse bars 41 are copper bars. The longitudinal strips 42 on the grid heat transfer sleeve 4 are used for connecting and supporting the inner shell 2 and the outer shell 3, the transverse strips 41 are used for increasing the heat dissipation area of the connecting longitudinal strips 42 and the inner shell 2, and the thickness of the transverse strips 41 between the inner shell 2 and the outer shell 3 is smaller than that of the longitudinal strips 42, so that the electrolyte solution overflowing to the liquid storage cavity 31 can naturally flow down in the liquid storage cavity 31 by means of gravity.

The bottom of shell 3 is provided with positive terminal 5, negative terminal 6 and ground terminal 7, and ground terminal 7 penetrates in the stock solution chamber 31 and links to each other with grid heat transfer sleeve 4 electrical property, and positive terminal 5 penetrates the anodal electric connection of inner shell 2 and electric capacity 1, and negative terminal 6 penetrates the negative pole electric connection of inner shell 2 and electric capacity 1. The positive terminal 5, the negative terminal 6, and the ground terminal 7 are fixed to the case 3 by epoxy resin.

The above embodiments are preferred embodiments of the present application, and the protection scope of the present application is not limited by the above embodiments, so: all equivalent changes made according to the structure, shape and principle of the present application shall be covered by the protection scope of the present application.

Claims (8)

1. The utility model provides an electrolytic capacitor of high security, its characterized in that, includes electric capacity (1), inner shell (2) and shell (3), the inside chamber (23) that holds that is used for installing electric capacity (1) that is equipped with of inner shell (2), shell (3) cladding form liquid storage cavity (31) outside inner shell (2) and with inner shell (2) cooperation, the top of inner shell (2) is provided with overflow hole (24) that are used for the intercommunication to hold chamber (23) and liquid storage cavity (31), be provided with eardrum (25) that have withstand voltage upper limit in overflow hole (24), eardrum (25) cut off overflow hole (24), install grid heat transfer sleeve (4) in liquid storage cavity (31), the inboard and the outside of grid heat transfer sleeve (4) butt respectively in the lateral surface of inner shell (2) and the medial surface of shell (3).

2. The electrolytic capacitor with high safety as claimed in claim 1, wherein the inner case (2) and the outer case (3) are cylindrical shells coaxially arranged, and the bottom of the inner case (2) and the bottom of the outer case (3) are integrally connected.

3. The electrolytic capacitor with high safety as claimed in claim 2, wherein the grid heat transfer sleeve (4) is a conductive sleeve, the inner shell (2) and the outer shell (3) are insulated from the grid heat transfer sleeve (4), the bottom of the outer shell (3) is provided with a positive terminal (5), a negative terminal (6) and a ground terminal (7), the ground terminal (7) penetrates into the liquid storage cavity (31) to be electrically connected with the grid heat transfer sleeve (4), and the positive terminal (5) and the negative terminal (6) penetrate into the inner shell (2) and are electrically connected with the capacitor (1).

4. The electrolytic capacitor with high safety according to claim 3, wherein the grid heat transfer sleeve (4) is composed of a plurality of transverse strips (41) surrounding the inner shell (2) and longitudinal strips (42) connecting the transverse strips (41), the transverse strips (41) and the longitudinal strips (42) are arranged in a staggered manner, opposite sides of the longitudinal strips (42) abut against the outer side surface of the inner shell (2) and the inner side surface of the outer shell (3), and the thickness of the transverse strips (41) between the inner shell (2) and the outer shell (3) is smaller than that of the longitudinal strips (42).

5. The high-safety electrolytic capacitor as claimed in claim 4, wherein the inner case (2) comprises an aluminum case (21) and an insulating layer (22) covering the outer side of the aluminum case (21).

6. The high-safety electrolytic capacitor as claimed in claim 5, wherein the insulating layer (22) is an insulating paper.

7. High-safety electrolytic capacitor according to claim 3, characterized in that the positive terminal (5), the negative terminal (6) and the ground terminal (7) are fixed to the case (3) by epoxy resin.

8. The high-safety electrolytic capacitor as claimed in claim 4, wherein the horizontal bars (41) and the vertical bars (42) are copper bars.

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