CN104064359A - Solid electrolytic capacitor with multilayer-mode electrode component - Google Patents
Solid electrolytic capacitor with multilayer-mode electrode component Download PDFInfo
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Abstract
The invention provides a solid electrolytic capacitor with a multilayer-mode electrode component. The solid electrolytic capacitor comprises the multilayer-mode electrode component. The multilayer-mode electrode component comprises a plurality of electrode component assembly units which are superposed layer by layer. Any electrode component assembly unit comprises a cathode portion and an anode area, wherein the cathode area and the anode area are separated through an insulation paste. After the superposition of the electrode component assembly units, the overall surface of the cathode portion is covered with a conductive connection layer, a first cathode layer and a second cathode layer in sequence to form the cathode area, wherein the conductive connection layer extends between any two adjacent electrode component assembly units and covers the surface of each cathode portion. The advantages of the solid electrolytic capacitor are that the solid electrolytic capacitor is more compact, scientific and reasonable in structure; equivalent series resistance is reduced; leak current is reduced and cost of the production materials is reduced; productivity of the products is improved; and the solid electrolytic capacitor has a remarkable economic benefit and social benefit.
Description
[technical field]
The present invention relates to a kind of solid electrolytic capacitor, relate in particular to a kind of solid electrolytic capacitor with multilayered schema electrode member structure.
[background technology]
Conducting high polymers thing, since being synthesized the seventies, has been the popular object of academia and industrial quarters research and development in decades always.Solid state cathode material with conducting high polymers thing as aluminium electrolytic capacitor, having made aluminium electrolytic capacitor in high stability, long-life and having expanded the aspects such as range of application has had quantum jump.Polypyrrole (PPY) is as a kind of conducting high polymers thing, and its conductance can reach 20S/cm, higher 10 times than organic semiconductor TCNQ, higher more than 100 times than the conductance of the liquid electrolyte in conventional aluminum electrolytic capacitor.Conducting polymer is applied in solid sheet type aluminum electrolytic capacitor as cathode material, also has the characteristic of " self-healing ", and can not burn.Along with electronics miniaturization, lightweight, require gradually capacitor to maximize in limited bulk inner capacities, ESR (Equivalent SeriesResistance equivalent series resistance) minimizes.
The general mode of making at present solid electrolytic capacitor is after traditional monolithic capacitor element, after lamination assembling, to encapsulate and to make again, as shown in Figure 1, it is traditional monolithic capacitor component structure schematic diagram, traditional monolithic capacitor element 10 ' comprises cathodic region 11 ' and an anode region 12 ', this cathodic region 11 ' and anode region 12 ' separate by an insulating cement 13 ', described cathodic region 11 ' comprises the anode bodies 1 ' arranging from inside to outside, oxide film dielectric 2 ', the first solid electrolyte layer 3 ', the second solid electrolyte layer 4 ', the first cathode layer 5 ' and the second cathode layer 6 ', described anode region 12 ' for internal layer be anode bodies 1 ', skin is the double-layer structure of oxide film dielectric 2 '.Wherein, described anode bodies 1 ' main component is aluminium, and oxide film dielectric 2 ' main component is aluminium oxide, and the main component of the first cathode layer 5 ' is carbon, and the main component of the second cathode layer 6 ' is silver.Again as shown in Figure 2; it is structure chart after monolithic capacitor element-stacked package traditional in solid electrolytic capacitor; multiple conventional one-piece capacitor elements 10 ' are superimposed upon on lead frame 7 ' by welding and conductive silver bonding agent 8 '; between anode region 12 ', use an anode pad 9 ' to connect, entirety is set and is formed a complete solid electrolytic capacitor by protectiveness.
But this traditional solid electrolytic capacitor, because of the number of plies of monolithic capacitor element more, cause thickness thicker, therefore the lamination number of the monolithic capacitor element in the effective volume of solid electrolytic capacitor is less, thereby not only cannot reach large capacity production object, and because the high manufacturing cost that causes of silver metal material cost of described the second cathode layer increases.Meanwhile, more because of the number of plies of monolithic capacitor element, the welding times that causes monolithic capacitor element to be welded to lead frame increases, and welding process is subject to thermal shock to cause the underproof probability of leakage current to increase.In addition, the gap between the monolithic capacitor element in this solid electrolytic capacitor structure, also can cause being easily subject to material impact in encapsulation process and cause leakage current defective.
[summary of the invention]
The technical problem to be solved in the present invention, is to provide a kind of solid electrolytic capacitor of multilayered schema electrode member; The structure of this solid electrolytic capacitor is compacter, improve product capacity, also can reduce production material cost, and the qualification rate of product is high.
One of the technical problem to be solved in the present invention is achieved in that a kind of solid electrolytic capacitor of multilayered schema electrode member, comprise a multilayered schema electrode member, this multilayered schema electrode member comprises a plurality of electrode member assembly units that successively stack arranges, arbitrary electrode member assembly unit includes a negative pole part and anode region, this negative pole part and anode region separate by an insulating cement, after described electrode member assembly unit stack, the integral surface of negative pole part covers a conduction articulamentum one by one, one first cathode layer and one second cathode layer, form cathodic region, and described conduction articulamentum also extends between wantonly two adjacent electrode member assembly units and covers each negative pole part surface.
Described conduction articulamentum is electrochemical polymerization layer.
The number of described electrode member assembly unit is 2～8.
Described negative pole part comprises the anode bodies, oxide film dielectric, the first solid electrolyte layer, the second solid electrolyte layer that arrange from inside to outside; Described conduction articulamentum is to extend to the surface that covers the second solid electrolyte layer of each negative pole part between wantonly two adjacent electrode member assembly units; Described anode portion comprises the anode bodies and the oxide film dielectric that arrange from inside to outside; Described anode bodies is the one in aluminium, niobium, titanium or tantalum; Described oxide film dielectric is a kind of metal oxide in aluminium, niobium, titanium or tantalum; Described the first cathode layer is carbon-coating; Described the second cathode layer is silver layer.
Tool of the present invention has the following advantages: the structure of the solid electrolytic capacitor of multilayered schema electrode member is compacter, science, rationally, in same volume inner pressure vessel, all folded component numbers maximize, also can reduce equivalent series resistance, reduce leakage current, effectively dwindle small product size, reduce production material cost, improve product yield, and preparation technology and traditional handicraft basic identical, workable, be applicable to megatechnics transformation, promote, there is significant economic benefit and social benefit.
[brief description of the drawings]
The present invention is further illustrated in conjunction with the embodiments with reference to the accompanying drawings.
Fig. 1 is monolithic capacitor component structure figure traditional in solid electrolytic capacitor.
Fig. 2 is the structure chart of the solid electrolytic capacitor after conventional package.
Fig. 3 is the multilayered schema electrode member structure chart in solid electrolytic capacitor of the present invention.
Fig. 4 is the structural representation in the solid electrolytic capacitor of the multilayered schema electrode member after the present invention encapsulates.
Fig. 5 is the chaff schematic diagram with profile of tooth of solid electrolytic capacitor of the present invention.
Fig. 6 is the profile of tooth chaff schematic diagram of solid electrolytic capacitor tape insulation glue of the present invention.
Fig. 7 is multilayered schema electrode member conduction articulamentum polyplant schematic diagram of the present invention.
[embodiment]
Refer to shown in Fig. 3 and Fig. 4, the solid electrolytic capacitor of multilayered schema electrode member of the present invention comprises a multilayered schema electrode member 100, the cathodic region 11 of this multilayered schema electrode member 100 is connected to the negative pole part 81 of a lead frame 8 by an electrically conducting adhesive 91, between anode region 12, connect with an anode pad 92, be connected to afterwards described lead frame 8 anode portion 82.
Described multilayered schema electrode member 100 comprises a plurality of electrode member assembly units 10 that successively stack arranges, arbitrary electrode member assembly unit 10 includes a negative pole part and anode region 12, this negative pole part and anode region 12 separate by an insulating cement 13, and described negative pole part comprises the anode bodies 1, oxide film dielectric 2, the first solid electrolyte layer 3, the second solid electrolyte layer 4 that arrange from inside to outside; Described anode region 12 comprises the anode bodies 1 and the oxide film dielectric 2 that arrange from inside to outside.After described electrode member assembly unit 10 stacks, the integral surface of negative pole part covers a conduction articulamentum 5, one first cathode layer 6 and one second cathode layer 7 one by one, form cathodic region, and described conduction articulamentum 5 also extends between wantonly two adjacent electrode member assembly units 10 and covers the second solid electrolyte layer 4.
Preferably, described conduction articulamentum 5 is electrochemical polymerization layer.The number of described electrode member assembly unit 10 is 2～8.Described anode bodies 1 is the one in aluminium, niobium, titanium or tantalum; Described oxide film dielectric 2 is a kind of metal oxide in aluminium, niobium, titanium or tantalum; Described the first cathode layer 6 is carbon-coating; Described the second cathode layer 7 is silver layer.
Please refer to shown in Fig. 3 to Fig. 7, describing preparation method of the present invention can be following step 10～50:
Step 10, by a kind of strip that cuts into being coated with in oxide film dielectric 2 aluminium foils, niobium paper tinsel, titanium foil or tantalum paper tinsel (being anode bodies 1), and be die-cut into profile of tooth (seeing Fig. 5); On paper tinsel, apply insulating cement 13 (seeing Fig. 6); Be oxidized coverlay reparation to cutting body; On chaff, form by chemical polymerization the first dielectric substrate 3 that contains conducting polymer; On the first dielectric substrate 3, electrochemical polymerization forms the second dielectric substrate 4, prepares electrode member assembly unit 10.The present embodiment powers up mode with constant voltage or constant current free oxygen is changed into polymer, and polymerization electric current is 1mA/cm
2～10mA/cm
2, total time is 30 minutes～120 minutes; Solution contains monomer, dopant and solvent; Monomer is selected from one or more in pyrroles, thiophene or aniline, and concentration is 0.5%～20%, and preferably 0.5%～10%; Dopant is selected from one or more in neopelex, dodecyl sodium sulfate, paratoluenesulfonic acid sodium salt, sodium naphthalene sulfonate, dodecyl sodium naphthalene sulfonate or its ammonium salt, and concentration is 0.01M～0.1M, and solvent is water or organic solvent or both mixtures; Solution temperature is controlled at 0 DEG C～50 DEG C, preferably 0 DEG C～30 DEG C; PH value is controlled to 1.0～6.0 with acid, preferably 3.0～5.0.This acid can be organic acid as dodecyl sodium sulfonate, p-methyl benzenesulfonic acid, naphthalene sulfonic acids, can be also inorganic acid.The second dielectric substrate 4 that low temperature environment generates is more regular, fine and close, and conductivity is also higher, and the performance of the second dielectric substrate 4 that acid condition generates is also better.Obtain an electrode member assembly unit 10.
Step 20, again 2～8 electrode member assembly units 10 are successively superposeed utilize as outer electrode 201 clampings in Fig. 7 together.
Step 30, the electrode member assembly unit 10 that comprises anode bodies 1, oxide film dielectric 2, the first dielectric substrate 3 and the second dielectric substrate 4 is conducted electricity to articulamentum polymerization, described conduction articulamentum polymerization procedure polymeric solution, equipment used is identical with described electrochemical polymerization step: power up mode with constant voltage or constant current together by electrochemical polymerization device 20 Fig. 7 peripheral electrode 201 adductions electrode member assembly unit 10 is connected, polymerization electric current is 0.5mA/cm
2～5mA/cm
2, total time is 10 minutes～80 minutes.The polymer fluid of the electrochemical polymerization device 20 in Fig. 7 contains monomer, dopant and solvent; Monomer is selected from one or more in pyrroles, thiophene or aniline, and concentration is 0.5%～20%, and preferably 0.5%～10%; Dopant is selected from one or more in neopelex, dodecyl sodium sulfate, paratoluenesulfonic acid sodium salt, sodium naphthalene sulfonate, dodecyl sodium naphthalene sulfonate or its ammonium salt, and concentration is 0.01M～0.1M, and solvent is water or organic solvent or both mixtures; Solution temperature is controlled at 0 DEG C～50 DEG C, preferably 0 DEG C～30 DEG C.PH value is controlled to 1.0～6.0 with acid, preferably 3.0～5.0; This acid can be organic acid as dodecyl sodium sulfonate, p-methyl benzenesulfonic acid, naphthalene sulfonic acids, can be also inorganic acid.The second dielectric substrate that low temperature environment generates is more regular, fine and close, and conductivity is also higher, and the performance of the conduction articulamentum that acid condition generates is also better.The conduction articulamentum 5 of preparing gained covers the surface of the electrode member assembly unit 10 after described stack, and this conduction articulamentum 5 is connected between described plurality of electrodes component element unit 10.
Step 40, afterwards on the good conduction articulamentum 5 of polymerization according to prior art infusion process, cover successively upper the first cathode layer 6 of carbon containing and the second cathode layer 7 of argentiferous, be prepared into a multilayered schema electrode member 100 that comprises 3 electrode member assembly units 10.
Step 50, as shown in Figure 3, the last just cathodic region 11 of multilayered schema electrode member 100 is connected to the negative pole part 81 of lead frame 8, anode region 12 is connected to lead frame 8 anode portion 82: electrically conducting adhesive 91 drips to the negative electrode of multilayered schema electrode member 100 with point gum machine, the cathode terminal of multilayered schema electrode member 100 is bonded to lead frame 8 negative pole parts 81, between anode region 12, connect with an anode pad 92, dry 30 minutes～60 minutes for 150 DEG C afterwards; The anode tap of multilayered schema electrode member 100 is connected with lead frame 8 anode portion 82 with electric resistance welding.By the multilayered schema electrode member 100 connecting with epoxy resin by being of a size of long 7.3mm, wide is 4.3mm, thickly carry out plastic packaging for 1.1mm, described plastic packaging is for to be injected into epoxy resin in plastic package die in 150 DEG C～200 DEG C, keep taking out after 10s～200s, after 150 DEG C～200 DEG C, solidify 2 hours～5 hours, make cross linking of epoxy resin complete, be made into the solid electrolytic capacitor of the multilayered schema electrode member of 2～8 layers.
Embodiment 1
Utilize above-mentioned steps to be prepared, wherein step 20 is that 3 electrode member assembly units 10 are successively superposeed, and the prepared solid electrolytic capacitor of step 50 is the solid electrolytic capacitor of the multilayered schema electrode member of 3 layers.
Embodiment 2
Manufacture solid electrolytic capacitor with method in the same manner as in Example 1, different is in step 20,3 electrode member assembly units are successively superposeed and become 2 electrode member assembly units and successively superpose, then behind step 40 and 50, make the solid electrolytic capacitor of the multilayered schema electrode member that comprises 2 electrode member assembly units.
Embodiment 3
Manufacture solid electrolytic capacitor with method in the same manner as in Example 1, different is in step 20,3 electrode member assembly units are successively superposeed and become 8 electrode member assembly units and successively superpose, then behind step 40 and 50, make the solid electrolytic capacitor of the multilayered schema electrode member that comprises 8 electrode member assembly units.
Embodiment 4
Manufacture solid electrolytic capacitor with method in the same manner as in Example 1, different is in step 20,3 electrode member assembly units are successively superposeed and become 5 electrode member assembly units and successively superpose, then behind step 40 and 50, make the solid electrolytic capacitor of the multilayered schema electrode member that comprises 8 electrode member assembly units.
Embodiment 5
Manufacture solid electrolytic capacitor with method in the same manner as in Example 1, different is in step 20,3 electrode member assembly units are successively superposeed and become 6 electrode member assembly units and successively superpose, then behind step 40 and 50, make the solid electrolytic capacitor of the multilayered schema electrode member that comprises 8 electrode member assembly units.
Embodiment 6
Manufacture solid electrolytic capacitor with method in the same manner as in Example 1, different is in step 20,3 electrode member assembly units are successively superposeed and become 7 electrode member assembly units and successively superpose, then behind step 40 and 50, make the solid electrolytic capacitor of the multilayered schema electrode member that comprises 8 electrode member assembly units.
The present invention can also adopt following method to realize:
Embodiment 7
Step 10, by a kind of strip that cuts into being coated with in aluminium foil, niobium paper tinsel, titanium foil or the tantalum paper tinsel (being anode bodies 1) of oxide film dielectric, and be die-cut into profile of tooth; On chaff, apply insulating cement, to divide cathodic region and anode region; Carry out oxide film dielectric reparation to cutting body again; Then on chaff, form by chemical polymerization the first dielectric substrate that contains conducting polymer; On the first dielectric substrate, electrochemical polymerization forms the second dielectric substrate again, prepares face and obtains an electrode member assembly unit.The present embodiment powers up mode with constant voltage or constant current free oxygen is changed into polymer, and polymerization electric current is 1mA/cm
2, total time is 30 minutes; Solution contains monomer, dopant and solvent; Monomer is pyrroles, and concentration is 0.5%; Dopant is neopelex, and concentration is 0.01M, and solvent is water; Solution temperature is controlled at 0 DEG C～30 DEG C; PH value is controlled to 3.0～5.0 with acid.This acid can be organic acid as dodecyl sodium sulfonate, p-methyl benzenesulfonic acid, naphthalene sulfonic acids, can be also inorganic acid.The second dielectric substrate that low temperature environment generates is more regular, fine and close, and conductivity is also higher, and the performance of the second dielectric substrate that acid condition generates is also better.
Step 20, the electrode member assembly unit after electrochemical polymerization is overlapping according to the needed number of multilayered schema electrode member.
Step 30, the anode bodies that is coated with oxide film dielectric, the first dielectric substrate and the second dielectric substrate on electrode member assembly unit is conducted electricity to articulamentum polymerization, described conduction articulamentum polymerization procedure polymeric solution, equipment used is identical with described electrochemical polymerization step: power up mode with constant voltage or constant current together by the outer electrode adduction of electrochemical polymerization device multiple electrode member assembly units are connected, this enforcement is selected 4.Polymerization electric current is 0.5mA/cm
2, total time is 80 minutes, polymer fluid contains monomer, dopant and solvent; Monomer selects pyrroles, and concentration is 0.5%; Dopant selects neopelex, and concentration is 0.01M, and solvent is water; Solution temperature is controlled at 0 DEG C～30 DEG C.With acid by pH value control 3.0～5.0; This acid can be organic acid as dodecyl sodium sulfonate, p-methyl benzenesulfonic acid, naphthalene sulfonic acids, can be also inorganic acid.The second dielectric substrate that low temperature environment generates is more regular, fine and close, and conductivity is also higher, and the performance of the conduction articulamentum that acid condition generates is also better.
Step 40, on the good conduction articulamentum of polymerization according to prior art infusion process, cover successively upper the first cathode layer of carbon containing and the second cathode layer of argentiferous, be prepared into multilayered schema electrode member.
Step 50, the cathodic region of multilayered schema electrode member is connected to the negative pole part of lead frame, anode region is connected to lead frame anode portion: the electrically conducting adhesive of argentiferous drips to the negative electrode of multilayered schema electrode member with point gum machine, the cathodic region of multilayered schema electrode member is bonded to lead frame negative pole part, between anode region, connect with an anode pad, dry 30 minutes for 150 DEG C afterwards; The anode region of multilayered schema electrode member is connected with lead frame anode portion with electric resistance welding.Adopt epoxy resin to carry out plastic packaging the multilayered schema electrode member connecting; Described plastic packaging, for epoxy resin is injected in plastic package die in 150 DEG C, keeps taking out after 10s, after 150 DEG C, solidifies 2 hours, makes cross linking of epoxy resin complete, is made into the solid electrolytic capacitor of the multilayered schema electrode member of 3 layers.
Embodiment 8
Step 10, the chaff with oxide-film (being anode bodies) is cut into strip, and be die-cut into profile of tooth; On chaff, apply insulating cement, to divide cathodic region and anode region; Carry out oxide film dielectric reparation to cutting body again; Then on chaff, form by chemical polymerization the first dielectric substrate that contains conducting polymer; On the first dielectric substrate, electrochemical polymerization forms the second dielectric substrate, prepares electrode member assembly unit: power up mode with constant voltage or constant current free oxygen is changed into polymer, polymerization electric current is 10mA/cm
2, total time is 120 minutes; Solution contains monomer, dopant and solvent; Monomer selects aniline, and concentration is 10%; Dopant selects dodecyl sodium sulfate, and concentration is 0.1M, and solvent is organic solvent; Solution temperature is controlled at 30 DEG C～50 DEG C; PH value is controlled to 5.0～6.0 with acid.This acid can be organic acid as dodecyl sodium sulfonate, p-methyl benzenesulfonic acid, naphthalene sulfonic acids, can be also inorganic acid.The second dielectric substrate that low temperature environment generates is more regular, fine and close, and conductivity is also higher, and the performance of the second dielectric substrate that acid condition generates is also better.
Step 20, the electrode member assembly unit after electrochemical polymerization is overlapping according to the needed number of multilayered schema electrode member.
Step 30, the anode bodies that is coated with oxide film dielectric, the first dielectric substrate and the second dielectric substrate on electrode member assembly unit is conducted electricity to articulamentum polymerization, described conduction articulamentum polymerization procedure polymeric solution, equipment used is identical with described electrochemical polymerization step: power up mode with constant voltage or constant current together by the peripheral electrode adduction of electrochemical polymerization device electrode member assembly unit is connected, selecting number of connection is 2～5; Polymerization electric current is 5mA/cm
2, total time is 10 minutes.Polymer fluid contains monomer, dopant and solvent; Monomer selects thiophene, and concentration is 10%; Dopant selects dodecyl sodium sulfate, and concentration is 0.1M, and solvent is organic solvent; Solution temperature is controlled at 30 DEG C～50 DEG C.PH value is controlled to 5.0～6.0 with acid; This acid can be organic acid as dodecyl sodium sulfonate, p-methyl benzenesulfonic acid, naphthalene sulfonic acids, can be also inorganic acid.The second dielectric substrate that low temperature environment generates is more regular, fine and close, and conductivity is also higher, and the performance of the conduction articulamentum that acid condition generates is also better.
Step 40, on the good conduction articulamentum of polymerization according to prior art infusion process, cover successively upper the first cathode layer of carbon containing and the second cathode layer of argentiferous, be prepared into multilayered schema electrode member.
Step 50, the cathodic region of multilayered schema electrode member is connected to the negative pole part of lead frame, anode region is connected to lead frame anode portion: the electrically conducting adhesive of argentiferous drips to the negative electrode of multilayered schema electrode member with point gum machine, the cathodic region of multilayered schema electrode member is bonded to lead frame negative pole part, between anode region, connect with an anode pad, dry 60 minutes for 150 DEG C afterwards; The anode region of multilayered schema electrode member is connected with lead frame anode portion with electric resistance welding.Adopt epoxy resin to carry out plastic packaging the multilayered schema electrode member connecting; Described plastic packaging, for epoxy resin is injected in plastic package die in 200 DEG C, keeps taking out after 200s, after 200 DEG C, solidifies 5 hours, makes cross linking of epoxy resin complete, is made into the solid electrolytic capacitor of the multilayered schema electrode member of 2～5 layers.
Embodiment 9
Step 10, the chaff with oxide-film (being anode bodies) is cut into strip, and be die-cut into profile of tooth; On chaff, apply insulating cement, to divide cathodic region and anode region; Carry out oxide film dielectric reparation to cutting body again; Then on chaff, form by chemical polymerization the first dielectric substrate that contains conducting polymer; On the first dielectric substrate, electrochemical polymerization forms the second dielectric substrate, prepares electrode member assembly unit: power up mode with constant voltage or constant current free oxygen is changed into polymer, polymerization electric current is 5mA/cm
2, total time is 60 minutes; Solution contains monomer, dopant and solvent; Monomer is selected from pyrroles and thiophene, and concentration is 10%～20%; Dopant selects paratoluenesulfonic acid sodium salt, and concentration is 0.05M, and solvent is the mixture of water and organic solvent; Solution temperature is controlled at 20～30 DEG C, with sour, pH value is controlled to 1.0～3.0.This acid can be organic acid as dodecyl sodium sulfonate, p-methyl benzenesulfonic acid, naphthalene sulfonic acids, can be also inorganic acid.The second dielectric substrate that low temperature environment generates is more regular, fine and close, and conductivity is also higher, and the performance of the second dielectric substrate that acid condition generates is also better.
Step 20, the electrode member assembly unit after electrochemical polymerization is overlapping according to the needed number of multilayered schema electrode member.
Step 30, the anode bodies that is coated with oxide film dielectric, the first dielectric substrate and the second dielectric substrate on electrode member assembly unit is conducted electricity to articulamentum polymerization, described conduction articulamentum polymerization procedure polymeric solution, equipment used is identical with described electrochemical polymerization step: power up mode with constant voltage or constant current together by the peripheral electrode adduction of electrochemical polymerization device electrode member assembly unit is connected, selecting number of connection is 5～8; Polymerization electric current is 2.5mA/cm
2, total time is 50 minutes.Polymer fluid in electrochemical polymerization device contains monomer, dopant and solvent; Monomer is selected from pyrroles and thiophene, and concentration is 10%～20%; Dopant selects paratoluenesulfonic acid sodium salt, and concentration is 0.05M, and solvent is the mixture of water and organic solvent; Solution temperature is controlled at 20 DEG C～30 DEG C, with sour, pH value is controlled to 1.0～3.0; This acid can be organic acid as dodecyl sodium sulfonate, p-methyl benzenesulfonic acid, naphthalene sulfonic acids, can be also inorganic acid.The second dielectric substrate that low temperature environment generates is more regular, fine and close, and conductivity is also higher, and the performance of the conduction articulamentum that acid condition generates is also better.
Step 40, on the good conduction articulamentum of polymerization according to prior art infusion process, cover successively upper the first cathode layer of carbon containing and the second cathode layer of argentiferous, be prepared into multilayered schema electrode member.
Step 50, the cathodic region of multilayered schema electrode member is connected to the negative pole part of lead frame, anode region is connected to lead frame anode portion: the electrically conducting adhesive of argentiferous drips to the negative electrode of multilayered schema electrode member with point gum machine, the cathodic region of multilayered schema electrode member is bonded to lead frame negative pole part, between anode region, connect with an anode pad, dry 40 minutes for 150 DEG C afterwards; The anode region of multilayered schema electrode member is connected with lead frame anode portion with electric resistance welding.Adopt epoxy resin to carry out plastic packaging the multilayered schema electrode member connecting; Described plastic packaging is for to be injected into epoxy resin in plastic package die in 170 DEG C～200 DEG C, keep taking out after 50s～150s, after 150 DEG C～200 DEG C, solidify 3 hours～4 hours, make cross linking of epoxy resin complete, be made into the solid electrolytic capacitor of the multilayered schema electrode member of 5～8 layers.
Comparative example 1
13vf aluminium foil is die-cut into the strip with profile of tooth as Fig. 5, and group drains on technique bar, then on paper tinsel, cover silicon rubber as insulating cement, to divide cathodic region and anode region, as shown in Figure 6; The cathodic region of paper tinsel applies 13V voltage and mends formation in 0.2M ammonium adipate and 0.02M mixed aqueous solution, paper tinsel is immersed in the aqueous solution of 4% pyrroles and 0.05M paratoluenesulfonic acid sodium salt after 150s, and take out and dry,
Immerse again 30s in the aqueous solution of 10% potassium permanganate, 0.05M paratoluenesulfonic acid sodium salt, take out and dry, repeat 9 times, rear cleaning, drying, forwarding in 5% pyrroles and 0.03M paratoluenesulfonic acid sodium salt, with p-methyl benzenesulfonic acid, pH is adjusted to 4.0～6.0, is 5mA/cm at polymerization electric current
2current density under polymerization cleaning, drying after 60 minutes, apply graphitiferous coating with 10% graphite solution again, and dry and within 30 minutes, make the first cathode layer with 150 DEG C, silver slurry with 50% applies containing silver coating, and dry and make the second cathode layer in 30 minutes with 180 DEG C, element negative electrode being bonded to the cathodic region of lead frame, anode is connected to the anode region of lead frame with electric resistance welding, be made into two-layer monolithic capacitor, with epoxy resin plastic packaging element.
Comparative example 2
With with comparative example 1 in same procedure manufacture solid electrolytic capacitor, different is to be that two-layer monolithic capacitor element body becomes the monolithic capacitor element body of three layers.
By above embodiment and comparative example carry out performance test contrast to product, result is as table 1 and table 2
Table 1
From embodiment 1, embodiment 2 and 3 and the result of comparative example 1 and 2 can find out, the performance of described solid electrolytic capacitor is excellent, it not only greatly reduces receiving thickness after lead frame by described inventive method, and increase in product capacity, product E SR is less, and the productive rate of product is higher.
Table 2
| Embodiment | Capacity (μ F) | ESR(mΩ) | Productive rate |
| Embodiment 1 | 26.0 | 42.8 | 59.2％ |
| Embodiment 4 | 25.8 | 41.3 | 60.1％ |
| Embodiment 5 | 26.7 | 39.5 | 62.3％ |
| Embodiment 6 | 26.2 | 40.2 | 61.5％ |
| Embodiment 7 | 25.6 | 44.3 | 58.4％ |
| Embodiment 8 | 26.8 | 41.5 | 57.6％ |
| Embodiment 9 | 26.4 | 40.9 | 62.0％ |
| Comparative example 1 | 23.6 | 49.3 | 25.3％ |
Can find out with the result of comparative example 1 from embodiment 1,5～7, the performance of described solid electrolytic capacitor is excellent, its by different compositing conducting articulamentum polymerization electric currents in described inventive method surface go out properties of product all than more excellent, particularly polymerization electric current 3mA/cm
2the solid electrolytic capacitor product of making under current density, its ESR value is minimum, finished product is the highest.
Claims (4)
1. the solid electrolytic capacitor of a multilayered schema electrode member, it is characterized in that: comprise a multilayered schema electrode member, this multilayered schema electrode member comprises a plurality of electrode member assembly units that successively stack arranges, arbitrary electrode member assembly unit includes a negative pole part and anode region, this negative pole part and anode region separate by an insulating cement, after described electrode member assembly unit stack, the integral surface of negative pole part covers a conduction articulamentum one by one, one first cathode layer and one second cathode layer, form cathodic region, and described conduction articulamentum also extends between wantonly two adjacent electrode member assembly units and covers each negative pole part surface.
2. the solid electrolytic capacitor of multilayered schema electrode member according to claim 1, is characterized in that: described conduction articulamentum is electrochemical polymerization layer.
3. the solid electrolytic capacitor of multilayered schema electrode member according to claim 1 and 2, is characterized in that: the number of described electrode member assembly unit is 2～8.
4. the solid electrolytic capacitor of multilayered schema electrode member according to claim 1, is characterized in that: described negative pole part comprises the anode bodies, oxide film dielectric, the first solid electrolyte layer, the second solid electrolyte layer that arrange from inside to outside; Described conduction articulamentum is to extend to the surface that covers the second solid electrolyte layer of each negative pole part between wantonly two adjacent electrode member assembly units;
Described anode portion comprises the anode bodies and the oxide film dielectric that arrange from inside to outside;
Described anode bodies is the one in aluminium, niobium, titanium or tantalum;
Described oxide film dielectric is a kind of metal oxide in aluminium, niobium, titanium or tantalum;
Described the first cathode layer is carbon-coating;
Described the second cathode layer is silver layer.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410288586.6A CN104064359A (en) | 2014-06-25 | 2014-06-25 | Solid electrolytic capacitor with multilayer-mode electrode component |
| CN201410455031.6A CN104183388A (en) | 2014-06-25 | 2014-09-09 | Multilayer model electrode element of solid aluminum electrolytic capacitor and manufacturing technology thereof |
| CN201410455902.4A CN104200996A (en) | 2014-06-25 | 2014-09-09 | Solid electrolytic condenser for multi-level mode electrode element |
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| JP3366034B2 (en) * | 1991-12-25 | 2003-01-14 | 松下電器産業株式会社 | Manufacturing method of aluminum electrolytic capacitor |
| JP2004158577A (en) * | 2002-11-05 | 2004-06-03 | Japan Carlit Co Ltd:The | Process for producing laminated large area aluminum solid electrolytic capacitor and capacitor produced by that process |
| JP2004281515A (en) * | 2003-03-13 | 2004-10-07 | Matsushita Electric Ind Co Ltd | Layered solid electrolytic capacitor |
| JP2004311875A (en) * | 2003-04-10 | 2004-11-04 | Matsushita Electric Ind Co Ltd | Solid electrolytic capacitor |
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| JP5267586B2 (en) * | 2011-01-28 | 2013-08-21 | 株式会社村田製作所 | Solid electrolytic capacitor and manufacturing method thereof |
| CN102115599B (en) * | 2011-03-02 | 2013-11-20 | 福建国光电子科技股份有限公司 | Electrochemical polymerization solution and electrochemical polymerization process for preparing solid electrolyte layer on capacitor |
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