CN104319105A - Solid electrolytic capacitor with improved metal anode and manufacturing method thereof - Google Patents
Solid electrolytic capacitor with improved metal anode and manufacturing method thereof Download PDFInfo
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- CN104319105A CN104319105A CN201410589012.2A CN201410589012A CN104319105A CN 104319105 A CN104319105 A CN 104319105A CN 201410589012 A CN201410589012 A CN 201410589012A CN 104319105 A CN104319105 A CN 104319105A
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Abstract
The invention provides a solid electrolytic capacitor with an improved metal anode and a manufacturing method thereof. The solid electrolytic capacitor with the improved metal anode comprises a base material layer, a conductive macromolecule layer and an electrode layer, wherein the base material layer is provided with an anode part and a cathode part, the anode part is thinner than the cathode part, the cathode part is wrapped in the conductive macromolecule layer, and the conductive macromolecule layer is wrapped in the electrode layer. When the solid electrolytic capacitor with the improved metal anode is used for stack encapsulation molding, the welding success rate can be increased greatly.
Description
Technical field
The invention relates to a kind of solid electrolytic capacitor, and relate to a kind of solid electrolytic capacitor and manufacture method thereof of metal anode improvement especially.
Background technology
Press, capacitor is used in the primary element of consumer electrical home appliances, computer motherboard and periphery thereof, power supply unit, communication product and automobile etc. widely, and its main effect comprises: filtering, bypass, rectification, coupling, decoupling, phase inversion etc.It is one of indispensable element in electronic product.Along with the progress of manufacture of semiconductor technology, by semi-conductor packaging electronic product because the demand in market and towards the future development of more accurate advanced person.With regard to portable electronic product, the product that consumer expects need meet lightening, high frequency, multifunction, high-reliability and meet RoHS, be cannot meet product demand gradually with conventional liquid electrolytic capacitor, therefore solid electrolytic capacitor arises at the historic moment.
Solid electrolytic capacitor has different kenels according to different materials and purposes, and the solid electrolytic capacitor of current suitability for industrialized production is mainly based on aluminium matter solid electrolytic capacitor (Aluminum solid electrolytic capacitor) and tantalum matter solid electrolytic capacitor (Tantalum solid electrolytic capacitor).Generally speaking, for increasing the capacitance of capacitor, industry the most often utilizes storehouse or stacking mode to be connected in parallel by multiple aluminium matter solid electrolytic capacitor unit, and structure dresses up the solid electrolytic capacitor encapsulating structure of a high-capacitance, and its total capacitance is the summation of each capacitance.
Only, often following problem can be run into: first in storehouse structure process of assembling, the anode portion of two adjacent aluminium matter solid electrolytic capacitor unit is through welding manner and is fixedly connected with, but be subject to the thickness limits of anode portion, often be welded into power very low, or welding quality is not good, causes the reliability of solid electrolytic capacitor encapsulating structure better and easily lost efficacy; Moreover because the impact that anode portion is too thick and mechanical strength is not enough, often storehouse/stacking the quantity of aluminium matter solid electrolytic capacitor can not be too many, causes capacitance increasing degree limited.
In addition, in welding process, the facts of molten aluminum core splashings easily occurs when the anode portion of aluminium matter solid electrolytic capacitor that storehouse is arranged is squeezed, this molten aluminum core can after solidification by packaging plastic is coated and occupy space partly; Just, encapsulation finished goods is when by reflow oven, and this molten aluminum core second melting can occur again, thus its space vacateed can cause the sealing of packaging body not good, makes the moisture in air enter and affect the electrical characteristic intensity of capacitor.
The defect existed for above-mentioned aluminium matter solid electrolytic capacitor or deficiency, the present inventor is engaged in manufacturing experience and the technology accumulation of various capacitor then for many years with it, study energetically and how to improve from structure, to the disappearance of prior art can be improved, finally under the discretion of each side's condition is considered, develop the present invention.
Summary of the invention
The main purpose of the present invention is the solid electrolytic capacitor and the manufacture method thereof that provide a kind of metal anode improvement, when the solid electrolytic capacitor of described metal anode improvement is applied to storehouse encapsulated moulding, significantly can promote and be welded into power, and the quantity increasing storehouse/stacking is significantly to increase total capacitance in parallel.
In order to achieve the above object and effect, the present invention adopts following technology contents: a kind of solid electrolytic capacitor of metal anode improvement, comprise a substrate layer, an electroconductive polymer layer and an electrode layer, described substrate layer has an anode portion and a negative pole part, the thickness of the more described negative pole part of thickness of wherein said anode portion is thin, the coated described negative pole part of described electroconductive polymer layer, the coated described electroconductive polymer layer of described electrode layer.
The present invention separately adopts following technology contents to reach above-mentioned object and effect: a kind of manufacture method of solid electrolytic capacitor of metal anode improvement, comprise the following steps: first, one substrate layer is provided, described substrate layer has an anode portion and a negative pole part, and described anode portion and described negative pole part respectively comprise a metallic core and be formed at the two-sided two-layer corrosion layer of described metal core layer respectively; Then, at least remove the corrosion layer of the described anode portion of part, make the thickness of the more described negative pole part of the thickness of described anode portion be thin; Then, an electroconductive polymer layer is formed with coated described Overcast Very portion; And last, form an electrode layer with coated described electroconductive polymer layer.
The present invention at least has following beneficial effect: the present invention is through the design of the thickness of the anode portion " be thin compared with the thickness of negative pole part ", when being applied to storehouse encapsulation to increase capacitance, significantly can not only promote and be welded into power, reduce the quantity of impedance (ESR value) and the parallel connection of increase capacitor.
Other objects of the present invention and advantage can be further understood from the technology contents disclosed by the present invention.In order to above and other object of the present invention, feature and advantage can be become apparent, special embodiment below also coordinates institute's accompanying drawings to be described in detail below.
Accompanying drawing explanation
Fig. 1 is the generalized section of the solid electrolytic capacitor of the metal anode improvement of the present invention.
Fig. 2 is the schematic diagram of the front substrate layer of the thinning process of the present invention.
Fig. 3 is the schematic diagram of the substrate layer after the thinning process of first embodiment of the present invention.
Fig. 4 is first corrosion layer of the present invention or the schematic diagram of the second corrosion layer.
Fig. 5 is the schematic diagram of the substrate layer after the thinning process of second embodiment of the present invention.
Fig. 6 is the schematic flow sheet of the manufacture method of the solid electrolytic capacitor of the metal anode improvement of the present invention.
Fig. 7 A and Fig. 7 B be the substrate layer of the present invention before thinning with thinning after cross sectional photograph.
Fig. 8 is the schematic diagram of the solid electrolytic capacitor encapsulating structure of the solid electrolytic capacitor of application metal anode improvement of the present invention.
[symbol description]
C capacitor cell
The solid electrolytic capacitor of 1 metal anode improvement
10 substrate layers
11 anode portion
111 first metallic core
112 first corrosion layers
1121 Porous metal levels
1122 oxide scale films
12 negative pole parts
121 second metallic core
122 second corrosion layers
1221 Porous metal levels
1222 oxide scale films
13 electroconductive polymer layers
14 electrode layers
141 rubber layer
142 elargol layers
15 insulating barriers
2 packaging bodies
3 lead frames
31 first conducting terminals
32 second conducting terminals
T1, t2 thickness
Embodiment
Disclosed content relates to a kind of chip-shaped solid electrolytic capacitor (Stack-type solid electrolytic capacitor) constructing novelty, its technical characteristics is, capacitor anode portion makes its thickness reduce through the process of the mode such as laser engraving or mechanical densification, when utilizing several described chip-shaped solid electrolytic capacitor to carry out storehouse encapsulation to increase capacitance, significantly can not only promote and be welded into power, reduce the quantity of impedance (ESR value) and the parallel connection of increase capacitor, the more important thing is, can also prevent motlten metal from splashing, encapsulating structure is made to have good air-tightness and reliability.
Next will coordinate institute's accompanying drawings through several embodiment, and illustrate that the present invention has the unique technology parts such as innovation, progressive or effect compared with prior art, those of ordinary skill in the art can be realized according to this.Should be noted that, the modification that those of ordinary skill in the art carry out under not departing from spirit of the present invention and change, all do not depart from protection category of the present invention.
[the first embodiment]
Referring to Fig. 1, is the generalized section of the solid electrolytic capacitor of the metal anode improvement of first embodiment of the invention.As shown in Figure 1, the solid electrolytic capacitor 1 of the metal anode improvement of the present embodiment mainly comprises substrate layer 10, electroconductive polymer layer 13 and an electrode layer 14, wherein substrate layer 10 has anode portion 11 and a negative pole part 12, the coated negative pole part 12 of electroconductive polymer layer 13, electrode layer 14 coated with conductive macromolecule layer 13; It should be noted that the thickness t1 of anode portion 11 is less than the thickness t2 of negative pole part 12.
The solid electrolytic capacitor 1 of metal anode improvement is the anode region and the cathode zone (not indicating in figure) that utilize insulating barrier 15 to separate out capacitor, and on substrate layer 10, define the anode portion 11 and negative pole part 12 that are electrically insulated each other in this way.Coordinating consults shown in Fig. 2, substrate layer 10 is before thinning process, anode portion 11 comprises the first metallic core 111 and two-sided two-layer first corrosion layer 112 being formed at the first metallic core 111, negative pole part 12 comprises the second metallic core 121 and two-sided two-layer second corrosion layer 122 being formed at the second metallic core 121, and the thickness of the first corrosion layer 112 is identical with the thickness of the second corrosion layer 122.Coordinating consults shown in Fig. 3, substrate layer 10 is before and after thinning process, first corrosion layer 112 of anode portion 11 is also thinner than the second corrosion layer 122 of negative pole part 12, the thickness of the anode portion 11 of the present embodiment like this is about between 25 ~ 100 μm, the thickness of negative pole part 12 is about between 70 ~ 130 μm, although the present embodiment is that the present invention is not restricted to this with the aluminium foil of purity more than 99.8% as metallic core.
See also Fig. 2, Fig. 3 and Fig. 4, the first and second metallic core 111,121 can be the tantalum sintered object of a specific dimensions, aluminium foil or niobium ingot, and the first metallic core 111 is identical with the thickness of the second metallic core 121; It should be noted that, although the first and second corrosion layers 112,122 are all made up of one deck oxide scale film 1122,1222 of a Porous metal level 1121,1221 and covering Porous metal level 1121,1221, the first corrosion layer 112 is not identical with the thickness of the second corrosion layer 122.Further, the first corrosion layer 112 utilizes the mode such as laser engraving or mechanical densification to carry out thinning process, and the thickness of the first corrosion layer 112 after thinning process is less than the thickness of the second corrosion layer 122.Subsidiary one carries, and haveing the knack of this those skilled in the art can make according to the performance requirement of capacitor the specific thicknesses that anode portion 11 reaches required, and the present invention is not limited.Accordingly, can increase success rate and the quality of welding when the present invention is used in stacking-type encapsulation, and increase the storehouse number of plies of capacitor, the maximum storehouse number of plies is 8 layers.
Electroconductive polymer layer 13 is overlayed on the surface of the second corrosion layer 122 of negative pole part 12, is mainly used as the solid electrolyte of chip-shaped solid electrolytic capacitor.Electroconductive polymer layer 13 can comprise polyethylene dioxythiophene (polyethylene dioxythiophene, PEDOT), polythiophene (Polythiophene, PT), polyacetylene (Polyacetylene, PA), polyaniline (Polyaniline, or polypyrrole (Polypyrrole PAni), PPy), although the present embodiment is for PEDOT, the present invention does not limit the material of electroconductive polymer layer 13.Subsidiary one carries, above-mentioned all conducting polymer composites all possess high connductivity degree, excellent thermal endurance and temperature characterisitic, to be easily attached on dielectric layer and can not to destroy dielectric layer and can not the characteristic such as deterioration under applied voltage, are thus quite applicable to the electrolyte being used in solid electrolytic capacitor.
Electrode layer 14 is overlayed on the surface of electroconductive polymer layer 13, and concrete structure is pair of lamina electrode layer; In the present embodiment, electrode layer 14 comprises rubber layer 141 and an elargol layer 142, and rubber layer 141 is overlayed on the surface of electroconductive polymer layer 13, and elargol layer 142 is overlayed on the surface of rubber layer 141.
[the second embodiment]
See also Fig. 1 and Fig. 5, execute in example at this Real, anode portion 11 is only single first metallic core 111 and forms, and negative pole part 12 comprises the second metallic core 121 and two-sided two-layer second corrosion layer 122 being formed at the second metallic core 121.From Fig. 5 and Fig. 3 relatively, the present embodiment and previous embodiment maximum Cha Do are: anode portion 11 is after thinning process, just do not remove the corrosion layer in the first metallic core 111 completely, the first metallic core 111 of part can also be removed depending on demand, in this way, the thickness t1 of the anode portion 11 after thinning process can be less than the thickness t2 of negative pole part 12.
Refer to Fig. 6, the architectural feature of the solid electrolytic capacitor 1 of the metal anode improvement of the present invention has described in detail as above, and next will further illustrate the manufacture method of the solid electrolytic capacitor 1 of metal anode improvement, it mainly comprises the following steps:
First, step S100 is performed: provide a substrate layer 10, it has anode portion 11 and a negative pole part 12.As shown in Figure 2, anode portion 11 comprises the first metallic core 111 and two-sided two-layer first corrosion layer 112 being formed at the first metallic core 111, and negative pole part 12 comprises the second metallic core 121 and two-sided two-layer second corrosion layer 122 being formed at the second metallic core 121.
This step comprises two and implements important item: as shown in Figure 3, first, corrosion treatment is carried out to the first and second metallic core 111,121, corrosion treatment can be the chemically corrosion not applying voltage or the electrochemically property corrosion applying voltage, with respectively the first and second metallic core 111,121 two-sided on form a Porous metal level 1121,1221, Porous metal level 1121,1221 roughly presents spongy, effective area increase about 1.5 ~ 100 times can be made, and then can larger capacity be obtained; The second, utilize the forming liquid of boronic acid containing or nitric acid, and coordinate and suitable change into condition, form oxide scale film 1122,1222 to cover each Porous metal level 1121,1221, so just complete the preparation of substrate layer 10.Subsidiary one carries, have the knack of this those skilled in the art and can corrode according to the performance requirement of capacitor the Porous metal level 1121,1221 providing different depression pattern, and the oxide scale film that can control to change into condition and form specific thicknesses, obtain required capacity by this, the present invention does not limit the depression pattern on Porous metal level 1121,1221.
Then, step S102 is performed: the corrosion layer (the first corrosion layer 112) at least removing segment anode portion 11, makes the thickness of anode portion 11 be thin compared with the thickness of negative pole part 12.First, as shown in Figure 3, mainly utilize laser engraving mode (Laser trimming or Laser stripping) when performing this step, and remove the first corrosion layer 112 a part of in anode portion 11 along the thickness direction of substrate layer 10, but the present invention is unrestricted in this.Moreover, as shown in Figure 5, based on the consideration in the performance of capacitor or processing procedure, the first corrosion layer 112 of anode portion 11 when performing this step, also can be selected to remove completely, or even remove the first metallic core 111 of part further.In addition, as shown in figs. 7 a and 7b, the thickness of the anode portion 11 before thinning process is 110 μm (i.e. thickness of substrate layer) to the cross sectional photograph of substrate layer 10 before and after thinning process, and the thickness of the anode portion 11 after thinning process is 70 μm.
Mechanical densification mode can also be utilized when performing this step, such as, on the thickness direction of substrate layer, depress the first corrosion layer 112 of anode portion 11 with Flat pressure machine (not shown), to make the thinning of anode portion 11.Accordingly, the present invention significantly can promote the air-tightness quality being welded into power and encapsulation, and can promote the mechanical strength of self under not reducing capacitance not affect the prerequisite of capacitance.
After this, as shown in Figure 1, step S104 is performed: form an electroconductive polymer layer 13 with coated Overcast Very portion 12, and perform step S106: form an electrode layer 14 with coated with conductive macromolecule layer 13.After above step S100 to S106 progressively completes, i.e. the solid electrolytic capacitor 1 of obtained metal anode improvement of the present invention.
[Application Example]
Refer to Fig. 8, for applying the schematic diagram of the solid electrolytic capacitor encapsulating structure of the present invention.As shown in the figure, the solid electrolytic capacitor 1 of the several metal anode improvement in solid electrolytic capacitor encapsulating structure is that sequentially storehouse and reaching is connected in parallel, to form capacitor cell C; With regard to the solid electrolytic capacitor 1 of adjacent two metal anode improvement, the electrode layer 14 that two negative pole parts 12 that storehouse is arranged can pass through each other is electrically connected, and two anode portion 11 that storehouse is arranged can pass through weld layer (not indicating in figure) and combine.
Described solid electrolytic capacitor encapsulating structure also comprises packaging body 2 and a lead frame 3, packaging body 2 comprises lighttight encapsulating material (as Epoxy or Silicone), for capacitor cell C is completely coated, lead frame 3 comprises the first conducting terminal 31 and the second conducting terminal 32 separated from one another, first conducting terminal 31 one end connects with the anode portion 11 of solid electrolytic capacitor 1 of the metal anode improvement being positioned at bottom, the other end then extends to external environment condition by packaging body 2 side, second conducting terminal 32 one end connects with the negative pole part 12 of solid electrolytic capacitor 1 of the metal anode improvement being positioned at bottom, the other end then extends to external environment condition by packaging body 2 opposite side.It should be noted that application solid electrolytic capacitor encapsulating structure of the present invention has good air-tightness and reliability.
[the actual effect reached of the present invention]
In sum, beneficial effect of the present invention can be, the embodiment of the present invention is through " anode portion 11 of substrate layer 10 comprises the first metallic core 111 and two-sided two-layer first corrosion layer 112 being formed at the first metallic core 111, and negative pole part 12 comprises the second metallic core 121 and two-sided two-layer second corrosion layer 122 being formed at the second metallic core 121, and the thickness of the first corrosion layer 112 is also thinner than the second corrosion layer 122 " and " anode portion 11 is only single first metallic core 111 and forms, and negative pole part 12 comprises the second metallic core 121 and two-sided two-layer second corrosion layer 122 being formed at the second metallic core 121 " design, when being applied to storehouse encapsulation to increase capacitance, significantly can not only promote and be welded into power, reduce the quantity of impedance (ESR value) and the parallel connection of increase capacitor, the more important thing is, can also prevent motlten metal from splashing, encapsulating structure is made to have good air-tightness and reliability.
The foregoing is only embodiments of the invention, it is also not used to limit scope of patent protection of the present invention.Anyly have the knack of alike those skilled in the art, not departing from spirit of the present invention and scope, the equivalence of the change done and retouching is replaced, and still falls in scope of patent protection of the present invention.
Claims (10)
1. a solid electrolytic capacitor for metal anode improvement, is characterized in that, comprising:
One substrate layer, has an anode portion and a negative pole part, and wherein, the thickness of the more described negative pole part of thickness of described anode portion is thin;
One electroconductive polymer layer is coated described negative pole part; And
One electrode layer is coated described electroconductive polymer layer.
2. the solid electrolytic capacitor of metal anode improvement as claimed in claim 1, it is characterized in that, wherein said anode portion and described negative pole part respectively comprise:
One metallic core; And
Two-layer corrosion layer is be formed at described metallic core respectively two-sided;
Wherein, the thickness of the corrosion layer of the more described negative pole part of the thickness of the corrosion layer of described anode portion is thin.
3. the solid electrolytic capacitor of metal anode improvement as claimed in claim 1, it is characterized in that, wherein said anode portion is one first metallic core, described negative pole part comprises one second metallic core and is formed at the two-sided two-layer corrosion layer of described second metallic core respectively, and the thickness of more described second metallic core of thickness of described first metallic core is thin.
4. the solid electrolytic capacitor of metal anode improvement as claimed in claim 3, it is characterized in that, wherein said first metallic core is a tantalum sintered object, an aluminium foil or a niobium ingot.
5. the solid electrolytic capacitor of metal anode improvement as claimed in claim 3, it is characterized in that, wherein said second metallic core is a tantalum sintered object, an aluminium foil or a niobium ingot.
6. the solid electrolytic capacitor of metal anode improvement as claimed in claim 1, it is characterized in that, wherein said electrode layer comprises the rubber layer of a coated described electroconductive polymer layer and the elargol layer of a coated described rubber layer.
7. a manufacture method for the solid electrolytic capacitor of metal anode improvement, is characterized in that, comprises the following steps:
There is provided a substrate layer, described substrate layer has an anode portion and a negative pole part, and described anode portion and described negative pole part respectively comprise a metallic core and be formed at the two-sided two-layer corrosion layer of described metal core layer respectively;
At least remove the corrosion layer of the described anode portion of part, make the thickness of the more described negative pole part of the thickness of described anode portion be thin;
Form an electroconductive polymer layer with coated described Overcast Very portion; And
Form an electrode layer with coated described electroconductive polymer layer.
8. the manufacture method of the solid electrolytic capacitor of metal anode improvement as claimed in claim 7, it is characterized in that, wherein at least removing in the step of the corrosion layer of the described anode portion of part described, is to be removed completely by the corrosion layer of described anode portion along the thickness direction of described substrate layer in laser engraving mode or local removes.
9. the manufacture method of the solid electrolytic capacitor of metal anode improvement as claimed in claim 8, it is characterized in that, wherein in the step along the thickness direction of described substrate layer, the corrosion layer of described anode portion removed completely in laser engraving mode, it is the metallic core of the described anode portion removing part further.
10. the manufacture method of the solid electrolytic capacitor of metal anode improvement as claimed in claim 7, it is characterized in that, wherein at least removing in the step of the corrosion layer of the described anode portion of part described, is the corrosion layer depressing described anode portion in mechanical densification mode on the thickness direction of described substrate layer.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410589012.2A CN104319105A (en) | 2014-10-28 | 2014-10-28 | Solid electrolytic capacitor with improved metal anode and manufacturing method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410589012.2A CN104319105A (en) | 2014-10-28 | 2014-10-28 | Solid electrolytic capacitor with improved metal anode and manufacturing method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104882286A (en) * | 2015-06-09 | 2015-09-02 | 湖南柯立凯科技开发有限公司 | Solid-state aluminum electrolytic capacitor |
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| CN1327245A (en) * | 2000-05-31 | 2001-12-19 | 松下电器产业株式会社 | Aluminium electrolytic capacitor and its producing mehtod |
| CN101471185A (en) * | 2007-11-06 | 2009-07-01 | Nec东金株式会社 | Solid electrolytic capacitor with small leakage current and method of manufacturing the same |
| CN204215901U (en) * | 2014-10-28 | 2015-03-18 | 钰邦电子（无锡）有限公司 | The solid electrolytic capacitor of metal anode improvement |
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2014
- 2014-10-28 CN CN201410589012.2A patent/CN104319105A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1327245A (en) * | 2000-05-31 | 2001-12-19 | 松下电器产业株式会社 | Aluminium electrolytic capacitor and its producing mehtod |
| CN101471185A (en) * | 2007-11-06 | 2009-07-01 | Nec东金株式会社 | Solid electrolytic capacitor with small leakage current and method of manufacturing the same |
| CN204215901U (en) * | 2014-10-28 | 2015-03-18 | 钰邦电子（无锡）有限公司 | The solid electrolytic capacitor of metal anode improvement |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104882286A (en) * | 2015-06-09 | 2015-09-02 | 湖南柯立凯科技开发有限公司 | Solid-state aluminum electrolytic capacitor |
| CN104882286B (en) * | 2015-06-09 | 2017-07-28 | 湖南柯立凯科技开发有限公司 | A kind of solid-state aluminum electrolytic capacitor |
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Application publication date: 20150128 |