CN211879245U - High-sealing and high-stability electrolytic capacitor - Google Patents

Abstract

The utility model discloses a high leakproofness high stability electrolytic capacitor, including the casing and set up the apron on the casing, be equipped with a core package in the casing, the core package includes that the negative pole that hugs closely the setting in proper order draws foil strip, first electrolytic paper layer, positive pole to draw foil strip and second electrolytic paper layer, negative pole draws foil strip and positive pole to draw foil strip and is connected with negative pole binding post and the positive pole binding post that sets up on the apron respectively; and the lower surface of the cover plate is fixedly provided with a ceramic rod, and the ceramic rod is positioned between the first electrolytic paper layer and the anode foil leading strip and is tightly attached to the joint of the anode foil leading strip and the anode connecting terminal. The beneficial effects of the utility model are mainly embodied in that: the ceramic rod is tightly attached to the joint of the positive foil guiding strip and the positive wiring terminal, so that heat at the joint of the positive foil guiding strip and the positive wiring terminal is quickly diffused, adverse effects caused by heating at the joint can be reduced, and the stability of the capacitor is improved.

Description

High-sealing and high-stability electrolytic capacitor

Technical Field

The utility model relates to an electrolytic capacitor particularly, especially relates to a high leakproofness high stability electrolytic capacitor.

Background

The electrolytic capacitor is an irreplaceable basic element in various electronic products and is widely applied to the fields of electric automobiles, industrial energy-saving products, photovoltaic inverters and the like. In the recent years, the rapid development of electronic component integration and high-speed processing technology makes the global market put higher demands on the performance of the capacitor products. The development trend of electrolytic capacitors is long service life, high temperature resistance and high-frequency ripple current resistance.

The aluminum electrolytic capacitor comprises an aluminum shell, an element and a pin, wherein the element is packaged in a cavity of the aluminum shell, and the pin is connected with the element and led to the outside. The element comprises a positive aluminum foil, a negative aluminum foil and electrolytic paper positioned between the positive aluminum foil and the negative aluminum foil, and the conventional electrolytic paper is generally thin and single-layer. Because the positive electrode guide connecting piece is connected with the positive electrode aluminum foil through cold welding, electrochemical reaction can occur at the connecting part and generate a large amount of heat during electrifying, the heat is difficult to be quickly dissipated, the temperatures of different parts of the product are inconsistent, the stability of the product can be influenced, and the service life of the product is further shortened. Therefore, there is a need to improve the above-mentioned disadvantages.

SUMMERY OF THE UTILITY MODEL

The utility model aims at overcoming the defects existing in the prior art and providing the electrolytic capacitor with high sealing performance and high stability.

The purpose of the utility model is realized through the following technical scheme:

a high-sealing-performance and high-stability electrolytic capacitor comprises a shell and a cover plate arranged on the shell, wherein a core cladding is arranged in the shell and comprises a negative electrode lead foil strip, a first electrolytic paper layer, a positive electrode lead foil strip and a second electrolytic paper layer which are arranged in a closely attached mode in sequence, and the negative electrode lead foil strip and the positive electrode lead foil strip are respectively connected with a negative electrode connecting terminal and a positive electrode connecting terminal which are arranged on the cover plate; the lower surface of the cover plate is fixedly provided with a ceramic rod, and the ceramic rod is positioned between the first electrolytic paper layer and the anode foil leading strip and is tightly attached to the joint of the anode foil leading strip and the anode connecting terminal; a set of gaps are formed in the shell, the shell and the cover plate are wholly or partially covered with a heat dissipation layer in a vacuum film covering mode, and the heat dissipation layer at least blocks the gaps.

Preferably, the heat dissipation layer coats the whole shell and the outer surface of the cover plate, and the heat dissipation layer is heat-conducting silica gel.

Preferably, the gap may be rectangular or triangular or irregular or circular.

Preferably, an adhesive rubber pad is arranged between the shell and the cover plate, the upper end face of the adhesive rubber pad is connected with the shell, and the lower end face of the adhesive rubber pad is connected with the cover plate.

Preferably, the adhesive rubber pad is of a ring structure.

Preferably, the middle part of the shell is provided with a circle of binding groove, the binding groove is of an inwards concave arc structure, and the top point of the arc surface of the binding groove is always abutted against and kept in contact with the core bag.

The beneficial effects of the utility model are mainly embodied in that:

1. the ceramic rod is tightly attached to the joint of the positive foil guiding strip and the positive wiring terminal, so that heat at the joint of the positive foil guiding strip and the positive wiring terminal is quickly diffused, adverse effects caused by heating at the joint can be reduced, and the stability of the capacitor is improved.

2. The shell is provided with a gap, the shell is blocked by the heat-conducting silica gel layer, and the heat of the shell can be quickly dissipated by utilizing the quick heat dissipation performance of the heat-conducting silica gel layer. In addition, the structure can also enhance the sealing structure between the shell and the cover plate, so that the electrolytic capacitor has stronger sealing performance, the sealing effect of the electrolytic capacitor is improved, and the leakage risk of electrolyte is reduced.

3. The bonding strength between the heat-conducting silica gel layer and the shell is relatively weak, and when the internal pressure of the electrolytic capacitor is too high, the heat-conducting silica gel layer is firstly propped open, so that the directional pressure relief is realized, and the explosion of the capacitor is prevented.

4. The sealing performance that the stickness cushion further strengthened has improved electrolytic capacitor's sealed effect, reduces the weeping risk of electrolyte.

5. And a binding groove is additionally arranged in the middle of the shell to fix the core cladding in the radial direction, so that the anti-seismic performance of the capacitor is improved.

Drawings

The technical scheme of the utility model is further explained by combining the attached drawings as follows:

FIG. 1: the structure of the utility model is shown schematically;

FIG. 2: the structure schematic diagram of the middle core bag and the ceramic rod of the utility model;

FIG. 3: a partial enlarged view of a portion a in fig. 1.

Detailed Description

The present invention will be described in detail below with reference to specific embodiments shown in the drawings. However, these embodiments are not limited to the present invention, and structural, method, or functional changes made by those skilled in the art according to these embodiments are all included in the scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless otherwise specified.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; either mechanically or electrically. They may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.

The present invention will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.

As shown in fig. 1 to 3, the utility model discloses a high leakproofness high stability electrolytic capacitor, be in including casing 1 and setting apron 3 on the casing 1, be equipped with the stickness cushion 4 of loop configuration between casing 1 and the apron 3, the up end of stickness cushion 4 with casing 1 connects, its lower terminal surface with apron 3 connects. The sealing performance that the setting of stickness cushion further strengthened has improved electrolytic capacitor's sealed effect, reduces the weeping risk of electrolyte.

Be equipped with a core package 2 in the casing 1, foil strip 21, first electrolytic paper layer 22, anodal foil strip 23 and the second electrolytic paper layer 24 are drawn including hugging closely the negative pole that sets up in proper order to core package 2, the negative pole is drawn foil strip 21 and anodal foil strip 23 and is drawn respectively with the setting and be in negative pole binding post 31 and the anodal binding post 32 on the apron 3 are connected. Still set firmly a ceramic rod 33 on the lower surface of apron 3, ceramic rod 33 is located between first electrolytic paper layer 22 and the anodal foil leading strip 23, the negative pole foil leading strip 21, first electrolytic paper layer 22, anodal foil leading strip 23 and the winding formula of second electrolytic paper layer 24 are around establishing on ceramic rod 33, just ceramic rod 33 hug closely in anodal foil leading strip 23 and anodal binding post 32's junction. Above-mentioned structure utilizes ceramic rod to hug closely in anodal leading foil strip and anodal binding post's junction, with the heat rapid diffusion of anodal leading foil strip and anodal binding post junction, can reduce by the harmful effects that this department generates heat and causes, improves the stability of this condenser.

The core package 2 can be manufactured by connecting the positive electrode connecting terminal 32 and the negative electrode connecting terminal 31 with the corresponding positive electrode foil guiding strip 23 and the corresponding negative electrode foil guiding strip 21 through cold welding, sequentially arranging the negative electrode foil guiding strip 21, the first electrolytic paper layer 22, the positive electrode foil guiding strip 23 and the second electrolytic paper layer 24, placing the ceramic rod 33 at the joint of the positive electrode foil guiding strip 23 and the positive electrode connecting terminal 32, rotating the cover plate after the steps are completed to realize winding, binding and fixing the loose-stop belt after the winding is completed to manufacture the inner core structure, then impregnating the inner core structure with electrolyte, sealing the inner core structure in an aluminum shell through an bakelite cover, leading the pins to the outside to be the aluminum electrolytic capacitor, and performing a sleeve and an aging process according to a conventional process.

The utility model discloses an another design point lies in: a set of clearance 11 has been seted up on casing 1, clearance 11 can be rectangle or triangle-shaped or irregular shape or circular, all belongs to the utility model discloses a protection category does not do specifically and restricts. The shell 1 and the cover plate 3 are wholly or partially covered with a heat dissipation layer 12 in a vacuum film coating mode, and the heat dissipation layer 12 at least blocks the gap 11. Preferably, the heat dissipation layer 12 covers the entire outer surfaces of the housing 1 and the cover plate 3, and the heat dissipation layer 12 is heat conductive silica gel. In the above, the gap is formed in the shell, the shell is blocked by the heat-conducting silica gel layer, and the heat of the shell can be quickly dissipated by utilizing the quick heat dissipation performance of the heat-conducting silica gel layer. Simultaneously, this structure also can make electrolytic capacitor have stronger sealing performance to the sealed structure between reinforcing casing and the apron, has improved electrolytic capacitor's sealed effect, reduces the weeping risk of electrolyte. In addition, because the bonding strength between the heat-conducting silica gel layer and the shell is relatively weak, when the internal pressure of the electrolytic capacitor is too high, the heat-conducting silica gel layer is firstly spread, so that the directional pressure relief is realized, and the explosion of the capacitor is prevented.

In this embodiment, a circle of constraining groove 5 is arranged in the middle of the casing 1, the constraining groove 5 is of an inward concave arc structure, and the top of the arc surface of the constraining groove 5 is always abutted to and kept in contact with the core bag 2. And a binding groove is additionally arranged in the middle of the shell to fix the core cladding in the radial direction, so that the anti-seismic performance of the capacitor is improved.

It should be understood that although the present description refers to embodiments, not every embodiment contains only a single technical solution, and such description is for clarity only, and those skilled in the art should make the description as a whole, and the technical solutions in the embodiments can also be combined appropriately to form other embodiments understood by those skilled in the art.

The above list of details is only for the practical implementation of the present invention, and they are not intended to limit the scope of the present invention, and all equivalent implementations or modifications that do not depart from the technical spirit of the present invention should be included in the scope of the present invention.

Claims (6)

1. High leakproofness high stability electrolytic capacitor, including casing (1) and setting up apron (3) on casing (1), be equipped with a core package (2), its characterized in that in casing (1): the core bag (2) comprises a negative electrode foil leading strip (21), a first electrolytic paper layer (22), a positive electrode foil leading strip (23) and a second electrolytic paper layer (24) which are arranged in a close-fitting manner in sequence, and the negative electrode foil leading strip (21) and the positive electrode foil leading strip (23) are respectively connected with a negative electrode wiring terminal (31) and a positive electrode wiring terminal (32) which are arranged on the cover plate (3); a ceramic rod (33) is fixedly arranged on the lower surface of the cover plate (3), and the ceramic rod (33) is positioned between the first electrolytic paper layer (22) and the positive electrode foil leading strip (23) and is tightly attached to the joint of the positive electrode foil leading strip (23) and the positive electrode wiring terminal (32); a group of gaps (11) are formed in the shell (1), the shell (1) and the cover plate (3) are wholly or partially covered with a heat dissipation layer (12) in a vacuum film covering mode, and the heat dissipation layer (12) at least blocks the gaps (11).

2. The electrolytic capacitor with high sealing property and high stability as set forth in claim 1, wherein: the heat dissipation layer (12) coats the outer surfaces of the whole shell (1) and the cover plate (3), and the heat dissipation layer (12) is heat conduction silica gel.

3. The electrolytic capacitor with high sealing property and high stability as set forth in claim 2, wherein: the gap (11) may be rectangular or triangular or irregular or circular.

4. The electrolytic capacitor with high sealing property and high stability as set forth in claim 2, wherein: be equipped with stickness cushion (4) between casing (1) and apron (3), the up end of stickness cushion (4) with casing (1) is connected, its lower terminal surface with apron (3) are connected.

5. The electrolytic capacitor with high sealing property and high stability as set forth in claim 4, wherein: the viscous rubber pad (4) is of an annular structure.

6. The electrolytic capacitor with high sealing property and high stability as set forth in claim 2, wherein: the middle part of the shell (1) is provided with a circle of binding groove (5), the binding groove (5) is of an inwards concave arc-shaped structure, and the top point of the arc surface of the binding groove (5) is always abutted to and kept in contact with the core bag (2).

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