CN114743799A

CN114743799A - Aluminum electrolytic capacitor

Info

Publication number: CN114743799A
Application number: CN202210342380.1A
Authority: CN
Inventors: 黄定胜
Original assignee: Gree Electric Appliances Inc of Zhuhai; Zhuhai Gree Xinyuan Electronics Co Ltd
Current assignee: Gree Electric Appliances Inc of Zhuhai; Zhuhai Gree Xinyuan Electronics Co Ltd
Priority date: 2022-04-02
Filing date: 2022-04-02
Publication date: 2022-07-12

Abstract

The invention discloses an aluminum electrolytic capacitor, which comprises an aluminum shell and a core, wherein the core is arranged in the aluminum shell, a fixed edge is arranged on the side surface in the aluminum shell, the fixed edge extends along the axial direction of the aluminum shell, and the edge surface of the fixed edge is abutted against the outer part of the core so as to limit the radial movement of the core in the aluminum shell. According to the aluminum electrolytic capacitor provided by the invention, the edge surface of the fixed edge is abutted against the outside of the core to limit the radial movement of the core in the aluminum shell, so that the core is effectively prevented from shaking left and right in the aluminum shell in a strong vibration occasion, a shockproof effect is achieved, the damage caused by the vibration of the core can be avoided, the performance stability of the capacitor is improved, and the service life of the capacitor is prolonged.

Description

Aluminum electrolytic capacitor

Technical Field

The invention belongs to the technical field of capacitors, and particularly relates to an aluminum electrolytic capacitor.

Background

The capacitor is used as a common device in an electronic circuit and plays electric roles of filtering, bypassing, coupling, decoupling, phase shifting and the like, and the filtering is the most used one. The self-supporting substrate large-scale aluminum electrolytic capacitor adopts a top girdling sealing mode to fix and seal the cover plate and the core.

At present, the internal core fixing mode of the domestic large-scale aluminum electrolytic capacitor with the self-supporting substrate generally adopts the mode of sealing by combining an aluminum shell and a cover plate and binding waist to seal the capacitor, meanwhile, the cover plate and the bottom of the aluminum shell fix the inner core in an extrusion mode, and when the capacitor is installed on equipment and used, the vibration is generated more or less, the vibration of part of equipment is violent, the fixing mode is only suitable for the environment without vibration or extremely slight vibration, when the waist-binding fixing device is used in the occasion with severe vibration, the traditional waist-binding fixing mode can only prevent the core from shaking up and down, but the left and right shaking still exists, if the clearance between the core and the aluminum shell is larger, under the condition of severe external vibration for a long time, the core can obviously shake left and right in the aluminum shell, the stability of the aluminum electrolytic capacitor is seriously affected, and potential safety hazards such as short circuit or open circuit can occur.

Therefore, it is necessary to design a shockproof aluminum electrolytic capacitor to solve the above-mentioned problem that the stability of the aluminum electrolytic capacitor is affected by the core in the aluminum electrolytic capacitor due to the left and right shaking.

Disclosure of Invention

In order to solve the technical problem that the stability of the aluminum electrolytic capacitor is affected by the left-right shaking of the core in the aluminum electrolytic capacitor in the background art, an aluminum electrolytic capacitor is provided to solve the problem.

In order to achieve the purpose, the specific technical scheme of the aluminum electrolytic capacitor is as follows:

the utility model provides an aluminum electrolytic capacitor, includes aluminum hull and core, and the core setting is in the aluminum hull, and the inside side of aluminum hull is provided with fixed arris, and fixed arris extends along the aluminum hull axis direction, and the arris face butt of fixed arris is outside at the core to the radial movement of restriction core in the aluminum hull.

Further, fixed arris are provided with a plurality ofly, and a plurality of fixed arriss are along the circumferential direction evenly distributed of aluminum hull.

Furthermore, the contact part of the fixed edge and the core is arc-shaped.

Further, the fixing rib extends from the bottom of the aluminum shell to 2/3 of the length of the aluminum shell.

Further, the radius of the fixed edge gradually decreases from the bottom of the aluminum shell to 2/3 of the length of the aluminum shell.

Further, the radii of the fixed edges are the same.

Furthermore, the fixed edge and the aluminum shell are integrally connected.

Furthermore, the core and the fixing edge are in interference fit.

Further, the core sets up in the aluminum hull, and the side at aluminum hull top is recessed to form spacing portion, and the axis of spacing portion and the bottom restriction core of aluminum hull removes.

Further, still include the apron, the apron sets up in the top of spacing portion, and the side at aluminum hull top is along the anti limit of the axial direction of aluminum hull to it is fixed with the aluminum hull to lap.

The aluminum electrolytic capacitor of the invention has the following advantages:

according to the aluminum electrolytic capacitor provided by the invention, the fixing edge is arranged on the side surface in the aluminum shell, the fixing edge extends along the axis direction of the aluminum shell, and the edge surface of the fixing edge is abutted against the outside of the core to limit the radial movement of the core in the aluminum shell, so that the core is effectively prevented from shaking left and right in the aluminum shell in the occasion of strong vibration, a shockproof effect is achieved, the damage caused by the vibration of the core can be avoided, the stability of the performance of the capacitor is improved, and the service life of the capacitor is prolonged.

The side face of the top of the aluminum shell is concave inwards to form a limiting part, the limiting part and the bottom of the aluminum shell limit the axis movement of the core, and the stability of the core in the aluminum shell is further improved, so that the anti-seismic performance of the capacitor is improved.

Drawings

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

FIG. 2 is a schematic diagram of a cross-sectional structure of an aluminum electrolytic capacitor according to the present invention;

FIG. 3 is a first schematic structural diagram of the bottom of the aluminum electrolytic capacitor of the present invention;

fig. 4 is a schematic structural diagram of the bottom of the aluminum electrolytic capacitor of the invention.

The notation in the figure is:

1. an aluminum shell; 11. a groove; 2. a core; 3. fixing the edge; 4. a cover plate; 5. a sleeve; 6. a limiting part; 7. an explosion-proof valve; 8. leading out the inserting sheet.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The technical features mentioned in the different embodiments of the invention described below can be combined with each other as long as they do not conflict with each other.

The aluminum electrolytic capacitor of the present invention will be described with reference to fig. 1 to 4.

In the prior art, the large-scale aluminum electrolytic capacitor of domestic self-supporting base plate, the fixed mode of inside core 2, generally adopt the mode of

aluminium casing

1 and 4 combination seals of apron and beam waist, seal the condenser, and simultaneously,

apron

4 and 1 bottom of aluminium casing, fix inside core 2 through the extrusion mode, the condenser adorns the in-process of using on the equipment, can go out the vibration more or less, some equipment vibration is comparatively violent, traditional beam waist fixed mode, only can prevent rocking about 2 cores, and rock about and still exist, produce the damage to inner structure, potential safety hazards such as short circuit or open a way may appear.

New energy automobiles, audio equipment, electric tools and the like with higher requirements on shock resistance, and the self-supporting substrate large-scale aluminum electrolytic capacitor generally adopts two shock resistance modes: the first mode is the little explosion-proof mode in adoption condenser bottom, 1 bottom thickening of aluminum hull promptly, and increase many strengthening ribs, increase the intensity of 1 bottom of aluminum hull, put at 1 bottom central point of aluminum hull, design a less explosion-proof valve 7, prevent just that aluminum hull 1 from under the condition that internal pressure increases, condenser bottom deformation is protruding, core 2 is not hard up, thereby it is unusual to shake to appear, when the condenser internal pressure continues to increase, when the limit that explosion-proof valve 7 can bear has been surpassed, release in the little explosion-proof of centre again, alleviate the danger of the whole explosion of condenser. The second mode is that the capacitor is additionally provided with one or more than one beam waist on the side besides the beam waist originally used for sealing, so that the inner core 2 is fixed, and a better fixing effect can be achieved.

The first fixing mode is that the small explosion-proof aluminum shell 1 and the capacitor are difficult to manufacture. The defects are that 1) the pressure release difficulty is increased, the pressure in the capacitor is increased, and the inner core 2 of the capacitor cannot automatically loosen in a vibration-free occasion after the anti-explosion valve 7 is deformed. However, the explosion-proof valve 7 is relatively small, so that the internal pressure release effect is poor, and under extreme conditions, the action of the explosion-proof valve 7 is difficult to be timely transmitted, and the explosion risk of the whole capacitor still exists. 2) The fixation is not thorough. There is electrolytic paper (generally called as barrier paper) in the capacitor core 2, under the soaking of liquid electrolyte, the electrolytic paper can be softened, use in the occasion that has stronger vibrations, can produce lasting impact action to the electrolytic paper at core 2 both ends, especially under the condition that the clearance between core 2 and the aluminium hull 1 inner wall is slightly bigger, this kind of phenomenon is excellent obvious, in the stronger vibrations occasion for a long time, can lead to core 2 not hard up more and more seriously, vibrations are also more and more violent, can cause even to lead to the break off between foil strip and the leading-out terminal, the capacitor appears the phenomenon of opening a way, also can appear because core 2 internal wear, appear the short circuit between two electrodes and strike sparks, explosion danger even.

The second fixing mode has a good fixing effect under proper application conditions, but the best effect is difficult to achieve. The defect is mainly that 1) the manufacture is slightly complicated compared with the first method, if the middle corset is made in the aluminum shell 1 at the supplier, the matching between the core 2 and the corset is difficult to control, a gap is possibly formed between the inner wall of the corset and the core 2, the fixing effect is poor, or the inner diameter of the corset is smaller, and the core 2 is difficult to be arranged in the aluminum shell 1. Therefore, most of the capacitors are made of the common aluminum shell 1, the core 2 is firstly arranged in the aluminum shell 1, then the middle girdling part is added, and the fixing mode is relatively good as long as the girdling depth is well mastered. 2) The difficulty of pressure release is increased, and another problem is caused by the fixing mode, because one or more beam waists are added on the side surface of the capacitor, when the capacitor is used, the explosion-proof valve 7 at the bottom of the capacitor is difficult to convey due to the increase of the internal pressure, and the risk of explosion of the whole capacitor exists under the extreme condition.

As shown in fig. 1 and 2, the aluminum electrolytic capacitor of the present invention includes an aluminum case 1 and a core 2, wherein the core 2 is disposed in the aluminum case 1, a fixing rib 3 is disposed on a side surface inside the aluminum case 1, the fixing rib 3 extends along an axial direction of the aluminum case 1, and a rib surface of the fixing rib 3 abuts against an outside of the core 2 to limit radial movement of the core 2 in the aluminum case 1.

According to the aluminum electrolytic capacitor provided by the invention, the fixed edge 3 is arranged on the side surface inside the aluminum shell 1, the fixed edge 3 extends along the axis direction of the aluminum shell 1, the edge surface of the fixed edge 3 is abutted against the outside of the core 2 to limit the radial movement of the core 2 in the aluminum shell 1, so that the core 2 is effectively prevented from shaking left and right inside the aluminum shell 1 in the occasion of strong vibration, the shockproof effect is achieved, the damage caused by the vibration of the core 2 can be avoided, the performance stability of the capacitor is improved, and the service life of the capacitor is prolonged.

Further, as shown in fig. 1 and 2, the fixed arris 3 are provided with a plurality of, and a plurality of fixed arris 3 are along the circumferential direction evenly distributed of aluminum hull 1, will fix the even setting of arris 3 in aluminum hull 1's inside, when being convenient for fixed arris 3 fixes spacingly to core 2, can the atress be even around core 2, can not cause the damage to core 2. In this embodiment, 3 to 6 fixing ribs 3 are provided, and a plurality of fixing ribs 3 may be designed according to actual conditions.

Further, as shown in fig. 1 and 2, a fixing rib 3 is provided on the inner side surface of the aluminum case 1, and when the fixing rib 3 fixes and limits the core 2, the fixing rib 3 is pressed against the surface of the core 2, and the fixing rib 3 easily generates an indentation on the surface of the core 2, so that the contact portion between the fixing rib 3 and the core 2 is configured to be an arc-shaped structure, which does not damage the core 2 and destroy the internal structure of the core 2. In order to fix the core 2 better and limit the position, in the embodiment, the fixed edge 3 and the core 2 are in interference fit, the fixed edge 3 is pressed into the core 2, and the pressing depth is 0-1 mm.

Further, as shown in fig. 1 and 2, the core 2 is arranged in the aluminum shell 1, the side surface of the top of the aluminum shell 1 is concave inwards, the limiting part 6 and the bottom of the aluminum shell 1 limit the axial movement of the core 2, the stability of the core 2 in the aluminum shell 1 is further improved, and the anti-seismic performance of the capacitor is improved. The aluminum electrolytic capacitor provided by the invention further comprises a cover plate 4, wherein the cover plate 4 is arranged above the limiting part 6, and the side surface of the top of the aluminum shell 1 is reversed along the axial direction of the aluminum shell 1 so as to fix the cover plate 4 and the aluminum shell 1, prevent the electrolyte from leaking and guarantee the service life. The cover plate 4 is provided with a leading-out inserting piece 8. The limiting part 6 can also prevent the cover plate 4 from pressing downwards all the time to crush the core 2.

Further, as shown in fig. 1 and fig. 2, because the capacitor is in the production process, the aluminum shell 1 and the cover plate 4 are tightly combined, the side surface of the upper part is inwards concaved to form a limiting part 6, the cover plate 4 is supported, the cover plate 4 is prevented from pressing down to damage the internal structure all the time, the side surface of the top of the aluminum shell 1 is sealed and fixed along the reverse side of the axial direction of the aluminum shell 1, the cover plate 4 is prevented from leaking, and the service life is ensured. If the upper part of the aluminum shell 1 is also provided with the fixed edge 3, the edge turning and the groove rolling cannot be performed, so that the fixed edge 3 can be only added at the middle lower part. In addition, because the upper end is extruded by the cover plate 4 and fixed by the reverse side, the upper end does not have abnormal vibration, in this embodiment, the fixing rib 3 extends from the bottom of the aluminum shell 1 to 2/3 of the length of the aluminum shell 1, and the fixing rib 3 is not arranged at the upper part of the aluminum shell 1 close to the cover plate 4.

Further, as shown in fig. 1, the radius of each fixing edge 3 is the same, that is, the fixing edge 3 extends from the bottom of the housing of the aluminum housing 1 to 2/3 of the length of the aluminum housing 1, and the radius of each fixing edge 3 is the same, and since the core 2 is a cylindrical structure, the fixing edge 3 has the same shape as the radius of each fixing edge, which is beneficial to increasing the contact area with the core 2 and better fixing the limiting core 2. In this embodiment, the diameter of the fixing rib 3 is about 0.5-5 mm. The diameter of the fixing rib 3 is determined by the diameters of the capacitor aluminum shell and the inner core 2.

Further, as shown in fig. 1 and fig. 2, in another embodiment, the radius of the fixing rib 3 gradually decreases from the bottom of the housing of the aluminum housing 1 to 2/3 of the length of the aluminum housing 1, the fixing rib 3 is set to be a semi-conical structure with a small upper part and a large lower part, so that the core 2 is conveniently installed in the aluminum housing 1, and the top of the core 2 is clamped by the cover plate 4 and the bottom of the aluminum housing 1, so as to achieve a good fixing and limiting effect.

Further, as shown in fig. 3 and 4, the fixing rib 3 and the aluminum case 1 are integrally connected. The side surface of the corresponding part of the outer surface of the aluminum shell 1 and the fixed edge 3 can be the same with the fixed edge 3 and protrudes towards the core 2 to form a groove 11, or the outer surface of the aluminum shell 1 is unchanged and the fixed edge 3 protrudes towards the core 2. When the aluminum shell 1 and the fixed edge 3 are manufactured, the aluminum shell 1 is punched by equipment, and the fixed edge 3 and the aluminum shell 1 are integrated. When in punching, the aluminum shell is composed of two dies, wherein the inner surface of one outer die is provided with a raised fixed edge 3 or is not provided with the raised fixed edge 3, the inner die is also provided with an inner die, the outer surface of the inner die is required to be provided with a sunken edge, and the aluminum material is punched into a gap between the inner die and the outer die to obtain the aluminum shell 1 with the fixed edge 3.

Further, as shown in fig. 1 and 2, a sleeve 5 is further sleeved outside the aluminum shell 1, and the sleeve 5 mainly serves to identify products such as trademarks, capacities, voltages, models, temperatures, polarities and the like, and also serves to insulate and prevent short circuit and static electricity of the polar shell.

Further, as shown in fig. 3 and 4, an explosion-proof valve 7 is further provided at the bottom of the aluminum case 1, and the explosion-proof valve 7 is released in time when the internal pressure abnormally rises, thereby reducing the danger of the capacitor during explosion. The thickness of the bottom of the aluminum shell 1 of the aluminum electrolytic capacitor is about 0.5mm, under the condition of the thickness, the aluminum electrolytic capacitor can bear at least 50 atmospheric pressures, the capacitor can be used under normal conditions and basically does not generate danger, but when the aluminum electrolytic capacitor is used under extreme conditions or certain hidden dangers exist in the capacitor, high atmospheric pressure phenomenon can be generated in the aluminum electrolytic capacitor, dozens of atmospheric pressures can be generated in the aluminum electrolytic capacitor, and the danger is higher in instant explosion, in order to reduce the danger of individual products, the middle of the bottom of the aluminum shell 1 is thinned a little, such as a cross-shaped pattern in the middle of figures 3 and 4, or other patterns can be formed, the aluminum electrolytic capacitor can be released under more than ten atmospheric pressures, and the danger of pressure release is greatly reduced.

The assembly process of the aluminum electrolytic capacitor of the invention is as follows:

firstly, riveting a core guide foil strip, namely leading out an insertion sheet 8 and two terminals of a cover plate 4, pressing a core 2 into an aluminum shell 1, binding a concave limiting part 6 at the top of the side surface of the aluminum shell 1, hanging the cover plate 4, finally crimping an opening at the upper end of the aluminum shell 1, tightly combining the opening with the upper surface of the cover plate 4, and forming a sealing space after assembling and sealing the cover plate 4 and the aluminum shell 1.

It is to be understood that the present invention has been described with reference to certain embodiments, and that various changes in the features and embodiments, or equivalent substitutions may be made therein by those skilled in the art without departing from the spirit and scope of the invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from the essential scope thereof. Therefore, it is intended that the invention not be limited to the particular embodiment disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.

Claims

1. The utility model provides an aluminum electrolytic capacitor, its characterized in that, includes aluminum hull and core, and the core setting is in the aluminum hull, and the inside side of aluminum hull is provided with fixed arris, and fixed arris extends along the aluminum hull axis direction, and the arris face butt of fixed arris is outside at the core to the radial movement of restriction core in the aluminum hull.

2. The aluminum electrolytic capacitor of claim 1, wherein the fixing ribs are provided in plurality, and the plurality of fixing ribs are uniformly distributed along the circumferential direction of the aluminum case.

3. The aluminum electrolytic capacitor of claim 1, wherein the contact portion of the fixing rib and the core is circular arc-shaped.

4. The aluminum electrolytic capacitor of claim 1 wherein the securing rib extends from the bottom of the aluminum can to 2/3 the length of the aluminum can.

5. The aluminum electrolytic capacitor of claim 1 wherein the radius of the stationary ridge decreases from the bottom of the aluminum can shell to 2/3 the length of the aluminum can.

6. The aluminum electrolytic capacitor of claim 1 wherein the radii are the same throughout the stationary ribs.

7. The aluminum electrolytic capacitor of claim 1, wherein the fixing rib is integrally connected to the aluminum case.

8. The aluminum electrolytic capacitor of claim 1 wherein the core and the securing rib are in an interference fit.

9. The aluminum electrolytic capacitor of claim 1, wherein the core is disposed in the aluminum case, the side surface of the top of the aluminum case is recessed to form a limiting portion, and the limiting portion and the bottom of the aluminum case limit the axial movement of the core.

10. The aluminum electrolytic capacitor of claim 9, further comprising a cover plate disposed above the limiting portion, wherein the side surface of the top of the aluminum case is reversed along the axial direction of the aluminum case to fix the cover plate to the aluminum case.