CN204927060U - Full tantalum non -solid tantalum electrolytic capacitor of mixed type - Google Patents

Abstract

The utility model discloses a full tantalum non -solid tantalum electrolytic capacitor of mixed type, include: metal tantalum shell is equipped with insulating the pad in it, full tantalum glass powder insulator, the encapsulation is on metal tantalum shell, have the positive pole tantalum piece of dielectric layer, the insulation of establishing in metal tantalum shell stacks up, through insulating between insulating pad and the metal tantalum shell, the negative pole is for the compound rete of deposited ruthenic oxide on metal tantalum shell inner wall, work electrolyte is filled in the positive pole tantalum piece and the space between the negative pole in metal tantalum shell, cathode leg fixes on metal tantalum shell, with this metal tantalum shell electrical connection, the anode lead wire is fixed on positive pole tantalum piece and is worn out outside metal tantalum shell and full tantalum glass powder insulator. This condenser is under volume invariant's prerequisite, and the capacitance can improve about the one time basically. Simultaneously, the increase of inner space has avoided reducing because of adopting high specific volume tantalum powder, reducing product electrical property and the reliability that modes increase volume capacitance per unit volume such as formation voltage brought.

Description

The full tantalum non-solid tantalum electrolytic capacitor of mixed type

Technical field

The utility model relates to tantalum capacitor field, particularly relates to the full tantalum non-solid tantalum electrolytic capacitor of a kind of mixed type.

Background technology

Full tantalum non-solid tantalum electrolytic capacitor structure is substantially identical with common silver-colored shell non-solid tantalum electrolytic capacitor structure, primarily of anode tantalum fuse, the Ta that generated in this anode tantalum core sub-surface and micropore by electrochemical reaction of tantalum powder compressing final vacuum sintering ₂o ₅dielectric oxide film and the negative electrode working electrolyte be encapsulated in metal shell are formed.Difference is the non-solid tantalum electrolytic capacitor of full tantalum is with the extraction negative electrode of tantalum shell as capacitor, and common non-solid tantalum electrolytic capacitor is as extraction negative electrode with silver-colored shell.Whole tantalum capacitor, compared with silver-colored shell non-solid tantalum electrolytic capacitor, has that volume is little, leakage current is little, Surge handling capability is strong, reliability high.At present, be widely used in fields such as Aeronautics and Astronautics, weapons, boats and ships.In recent years, along with Military Electronic Equipment is constantly to the development in the directions such as small size, highly reliable, production domesticization, also more and more urgent to the demand of more small size, more jumbo whole tantalum capacitor.

In order to reduce the volume of tantalum capacitor, improving its volume and capacity ratio, usually adopting the tantalum powder of Fabrication of High Specific Capacitance to make capacitor at present; But along with the raising of tantalum powder specific volume, the particle diameter of tantalum powder is more and more less, and puncture voltage also can decrease.For the tantalum capacitor of same size, when its rated voltage is identical with capacitance value, also just limits the high specific capacitance of adopted tantalum powder, thus limit the minimum volume of tantalum capacitor.In order to reduce the volume of tantalum capacitor further, many producers take to reduce coating-forming voltage, improve pressed density, reduce the measures such as sintering temperature; Although can reduce the volume of tantalum capacitor to a certain extent, turn increase control difficulty and the production cost of production process, corresponding reliability also decreases simultaneously.

Tradition whole tantalum capacitor by metal tantalum shell, the cathode leg be fixed on this tantalum shell, anode tantalum block (comprising by the dielectric layer of electrochemical reaction in described anode tantalum block), insulation cushion and the negative electrode be encapsulated in tantalum shell, be fixed in this anode tantalum block through anode lead wire, the Working electrolyte be filled in tantalum shell that described tantalum shell is drawn; Negative electrode is the tantalum cathode ring be attached to by compacting sintering on tantalum outer casing inner wall.The shortcoming of this whole tantalum capacitor is: the capacitance C=1/ (1/C of non-solid tantalum electrolytic capacitor _sun+ 1/C _cloudy).Wherein, C _sunfor the capacitance of anode tantalum block; C _cloudyfor cathodic electricity capacity.Work as C _cloudy> > C _suntime, C ≈ C _sun.Therefore, increasing cathodic electricity capacity is a problem that must solve in non-solid electrolyte Ta capacitor production process.And whole tantalum capacitor adopts cathode loop to increase cathodic electricity capacity at present, and then increase the capacitance of whole tantalum capacitor, to reach small size, jumbo demand.But although sintered cathode ring can increase cathodic electricity capacity but can occupy certain space, make anode tantalum fuse that space can be utilized to reduce, reduce the content volume ratio of product.In recent years, along with the develop rapidly that the fields such as Aeronautics and Astronautics, guided missile, communication and weapons are miniaturized, highly reliable, to more small size, the more demand of Large Copacity whole tantalum capacitor are more and more urgent.Tradition whole tantalum capacitor cannot meet the demand of each field develop rapidly.

In addition, existing whole tantalum capacitor adopts 38% sulfuric acid as Working electrolyte.The aqueous sulfuric acid of this 38%, because of good fluidity, easily occurs that in actual production capacitance is unstable, and upper the acid even phenomenon of leakage.

Utility model content

Based on the problem existing for above-mentioned prior art, the utility model provides a kind of mixed type full tantalum non-solid tantalum electrolytic capacitor, can solve and adopt cathode loop to increase the capacitance that cathodic electricity capacity increases whole tantalum capacitor at present, cause whole tantalum capacitor volume to increase, the problem that some occasion uses can not be met.

For solving the problems of the technologies described above, the utility model provides a kind of mixed type full tantalum non-solid tantalum electrolytic capacitor, comprising:

Metal tantalum shell, is provided with insulation cushion in it;

Full tantalum glass dust insulator, is encapsulated on described metal tantalum shell;

There is the anode tantalum block of dielectric layer, be located on the described insulation cushion in described metal tantalum shell, by insulating between described insulation cushion and described metal tantalum shell;

Negative electrode is the ruthenic oxide composite film applied on described metal tantalum outer casing inner wall;

Working electrolyte, is filled in the space between described anode tantalum block in described metal tantalum shell and negative electrode;

Cathode terminal, is fixed on described metal tantalum shell, is electrically connected with this metal tantalum shell;

Anode lead wire, to be fixed in described anode tantalum block and to pass to outside described metal tantalum shell and described full tantalum glass dust insulator.

The beneficial effects of the utility model are: by adopting the ruthenic oxide composite film applied on metal tantalum outer casing inner wall as negative electrode, on the one hand, ultracapacitor is formed at negative electrode, capacitance can reach tens millifarads, be far longer than the capacitance that anode tantalum fuse is formed, cathode loop can be replaced to increase the effect of cathodic electricity capacity; On the other hand, composite cathode coating is very thin, reduce the inner space of tantalum shell hardly, substantially increase the volume and capacity ratio of capacitance, be the cathode loop of about 1mm than thickness, reduce and occupy tantalum shell interior section space, make small product size specific capacity by the restriction of cathode loop, this capacitor is under the prerequisite of constancy of volume, and product capacitance can double left and right substantially.Meanwhile, the increase in interiors of products space avoids because adopting high specific capacitance tantalum powder, reduces the mode such as coating-forming voltage and increase product electrical property that small product size specific capacitance brings and reliability reduces.

Accompanying drawing explanation

In order to be illustrated more clearly in the technical scheme of the utility model embodiment, below the accompanying drawing used required in describing embodiment is briefly described, apparently, accompanying drawing in the following describes is only embodiments more of the present utility model, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawings can also be obtained according to these accompanying drawings.

The structural representation of the full tantalum non-solid tantalum electrolytic capacitor of mixed type that Fig. 1 provides for the utility model embodiment.

Embodiment

Be clearly and completely described the technical scheme in the utility model embodiment below, obviously, described embodiment is only the utility model part embodiment, instead of whole embodiments.Based on embodiment of the present utility model, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to protection range of the present utility model.

As shown in Figure 1, the utility model embodiment provides a kind of mixed type full tantalum non-solid tantalum electrolytic capacitor, comprising:

Insulation cushion 7 is provided with in metal tantalum shell 3;

Full tantalum glass dust insulator 2 is encapsulated on metal tantalum shell 3;

The anode tantalum block 5 with dielectric layer is located on the insulation cushion 7 in metal tantalum shell, by insulating between insulation cushion and metal tantalum shell;

Negative electrode 4 is the ruthenic oxide composite film applied on metal tantalum shell 3 inwall; This negative electrode under the prerequisite not increasing volume, can effectively promote the capacity of capacitor.

Working electrolyte 6, is filled in the space between anode tantalum block 5 in metal tantalum shell 3 and negative electrode 4; Preferably, Working electrolyte adopts the sulfogel electrolyte adding colloidal solution.This electrolyte stability is better, improves the stability of capacity, and effectively prevent product leakage or the leakage current that causes because of upper acid increases.Product stability and reliability all obtain and significantly promote.

Cathode terminal 8, is fixed on metal tantalum shell 3, is electrically connected with this metal tantalum shell;

Anode lead wire 1, to be fixed in anode tantalum block 5 and to pass to outside metal tantalum shell 3 and full tantalum glass dust insulator 2.

Below in conjunction with the drawings and specific embodiments, capacitor of the present utility model is described further.

As shown in Figure 1, this capacitor comprises: metal tantalum shell 3, be fixed on the cathode terminal 8 on this metal tantalum shell, be encapsulated in the anode tantalum block 5 (comprising by the dielectric layer of electrochemical reaction in described anode tantalum block) in described tantalum shell, insulation cushion 7 and negative electrode 4, negative electrode is the ruthenic oxide composite film applied on tantalum outer casing inner wall, be encapsulated in the full tantalum glass dust insulator 2 on metal tantalum shell, be fixed on the anode lead wire 1 through described full tantalum glass dust insulator in anode tantalum block, be filled in the Working electrolyte 6 in tantalum shell, Working electrolyte is the sulfogel electrolyte adding colloidal solution.

The capacitor of the utility model embodiment, after replacing cathode loop with metal tantalum outer casing inner wall coating ruthenic oxide composite film cathode material.On the one hand, after coating composite cathode material, form ultracapacitor at negative electrode, capacitance can reach tens millifarads, is far longer than the capacitance that anode tantalum fuse is formed, and cathode loop can be replaced to increase the effect of cathodic electricity capacity; On the other hand, the thickness of cathode loop is about 1mm, occupies tantalum shell interior section space, small product size specific capacity is made to be subject to larger restriction, and composite cathode coating is very thin, reduces the inner space of tantalum shell hardly, substantially increase the volume and capacity ratio of capacitance.Take housing diameter as Φ 5 be example, internal diameter of outer cover is 4.5mm, and cathode loop internal diameter is 3.5mm.Adopt the technical program, after replacing cathode loop by ruthenic oxide composite cathode, inner space increases 65%.The increase in interiors of products space, extremely beneficial for the volume and capacity ratio increasing product.After taking this technical scheme, under the prerequisite of constancy of volume, product capacitance can double left and right substantially.Meanwhile, the increase in interiors of products space avoids because adopting high specific capacitance tantalum powder, reduces the mode such as coating-forming voltage and increase product electrical property that small product size specific capacitance brings and reliability reduces.

In addition, in this capacitor, Working electrolyte adopts and adds colloidal solution and the gel electrolyte formed through suitable proportioning, and electrolyte stability is better, improves the stability of capacity, and effectively prevent product leakage or the leakage current that causes because of upper acid increases.Product stability and reliability all obtain and significantly promote.

The above; be only the utility model preferably embodiment; but protection range of the present utility model is not limited thereto; anyly be familiar with those skilled in the art in the technical scope that the utility model discloses; the change that can expect easily or replacement, all should be encompassed within protection range of the present utility model.Therefore, protection range of the present utility model should be as the criterion with the protection range of claims.

Claims (1)

1. the full tantalum non-solid tantalum electrolytic capacitor of mixed type, is characterized in that, comprising:

Metal tantalum shell, is provided with insulation cushion in it;

Full tantalum glass dust insulator, is encapsulated on described metal tantalum shell;

There is the anode tantalum block of dielectric layer, be located on the described insulation cushion in described metal tantalum shell, by insulating between described insulation cushion and described metal tantalum shell;

Negative electrode is the ruthenic oxide composite film applied on described metal tantalum outer casing inner wall;

Working electrolyte, is filled in the space between described anode tantalum block in described metal tantalum shell and negative electrode;

Cathode terminal, is fixed on described metal tantalum shell, is electrically connected with this metal tantalum shell;

Anode lead wire, to be fixed in described anode tantalum block and to pass to outside described metal tantalum shell and described full tantalum glass dust insulator.