CN104319103A - Metal shell packaged polymer tantalum capacitor and preparation method thereof - Google Patents
Metal shell packaged polymer tantalum capacitor and preparation method thereof Download PDFInfo
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Abstract
The invention relates to a metal shell packaged polymer tantalum capacitor and a preparation method of the metal shell packaged polymer tantalum capacitor and belongs to the technical field of electronic elements. The capacitor and the method are used for small electronic devices. The tantalum capacitor comprises an anode made from a tantalum core, a tantalum wire in the anode, a dielectric film covering the anode, an anode lead, a cathode and a shell. The cathode is made of an organic polymer material, the shell is made of metal and sealed through an insulator, and the capacitor is of a fully-closed structure. The tantalum core is cylindrical. Compared with the prior art, the metal shell packaged organic polymer cathode solid electrolyte tantalum capacitor capable of effectively replacing a non-solid electrolyte tantalum capacitor is provided, the condition that the electrical performance of a product is adversely affected due to the fact that a chip is damped and impurities enter a capacitor is avoided, the working voltage is higher, the capacity is larger, and the problem of product lack generated after metallic silver shell packaged non-solid electrolyte tantalum capacitors are forbidden or limited to be used in the field of civil spaceflight, aviation and the like currently can be effectively solved.
Description
Technical field
The present invention relates to a kind of electronic devices and components and manufacture method thereof, refer in particular to a kind of for packed by metal casing polymer tantalum capacitor in miniaturized electronic devices and preparation method thereof, belong to technical field of electronic components.
Background technology
Along with the development of electronic technology and electronic devices and components, and modern equipment is miniaturized, the needs of lightness and high reliability, has higher requirement to capacitor.
Organic polymer negative electrode tantalum capacitor belongs to universal component, it is the one in macromolecular solid bulk capacitor, because it has the advantages such as volume is little, lightweight, operating temperature range is wide, frequency characteristic is good, be widely used in mobile communication, stored-program control exchange, notebook computer, palmtop PC, e-commerce, computer, shoot with video-corder the surface-mounting equipment of the small-sized complete machine electronic equipments such as dual-purpose machine, automotive electronics, also widely use in the Military Electronics complete machine in the fields such as Aeronautics and Astronautics, satellite, Communication Control simultaneously.The feature of organic polymer negative electrode tantalum capacitor adopts organic polymer as cathode material, and its conductivity can reach 100S/CM, and this is 100 times of tcnq salt, is 10000 times of electrolyte, does not also pollute simultaneously, and positive pole adopts the capacitor of tantalum sintered object.The temperature characterisitic of organic polymer negative electrode tantalum capacitor is also relatively good, can restrain oneself the high temperature of 300 ° of more than C, and SMT paster technique therefore can be used to install, and is also applicable to large-scale production.The fail safe of organic polymer negative electrode tantalum capacitor is better, and in time running into high temperature, electrolyte just melts and can not produce blast, and therefore it has anti-explosion groove unlike conventional aluminium electrolyte electric capacity.So the application of organic polymer negative electrode tantalum capacitor will be more and more extensive.
But present domestic organic polymer negative electrode tantalum capacitor only has the product of the resin-molded structure of surface-pasted chip, this product adopts resin-molded encapsulation, do not accomplish hermetically sealed, in storage and use procedure, moisture-sensitive causes performance change, simultaneously because of its small volume, voltage and range of capacity cannot be done greatly, and the method for there is no is applied to the high-end field such as space flight, aviation.And the fields such as domestic space flight, aviation have started forbidding or limited the use of non-solid tantalum electrolytic capacitor, so be now badly in need of a kind of product that can substitute non-solid tantalum electrolytic capacitor, effectively non-solid tantalum electrolytic capacitor can be substituted.Therefore necessary existing organic polymer negative electrode tantalum capacitor to be improved.
By patent retrieval and non-patent literature retrieval, still do not find that there is the bibliographical information constructed with the present invention, related to the present invention mainly containing is following:
1, the patent No. is CN201310484448.0, name is called the patent of invention of " macromolecular polymerization tantalum capacitor cathode preparation method ", which disclose a kind of macromolecular polymerization tantalum capacitor cathode preparation method, aim to provide one first antianode tantalum block before preparing conducting high polymers layer and carry out surface preparation, to improve the method for PEDOT conductive film quality.Its technical scheme is that the anode tantalum block of surface attachment Ta2O5 dielectric oxide film to be dipped in conductivity be in the pretreatment fluid of 30 ~ 100 μ S/cm, takes out after dipping 5 ~ 15min by the speed of 1 ~ 2 ㎜/min; Described pretreatment fluid is formulated by the raw material of following percentage by volume: silane coupler 1 ~ 10%, glacial acetic acid 0.5 ~ 5%, water 85 ~ 98.5%.
2, the patent No. is CN201320516776.X, and the utility model patent that name is called " a kind of ultralow ESR chip polymer solid electrolyte capacitor ", which discloses a kind of low ESR chip polymer solid electrolyte capacitor, comprise core body and lead-in wire; Tantalum pentoxide layer is arranged on described core body, and conductive polymer layer is arranged on described tantalum pentoxide layer, and carbon-coating is arranged on described conductive polymer layer, and silver layer is arranged on described carbon-coating, and epoxy resin layer is arranged on described silver layer; Described lead-in wire is two, and described lead-in wire is connected with core body, capacitance is drawn.
3, the patent No. is CN200810004151.9, name is called the patent of invention of " manufacture method of tantalum capacitor ", which disclose a kind of method manufacturing tantalum capacitor, wherein high-performance tantalum capacitor utilizes more simple and economical equipment to manufacture with more efficient method by more simplifying.The method manufacturing tantalum capacitor comprises: prepare tantalum particle by sintering tantalum powder; Tantalum oxide particles is to form dielectric layer in its surface; The tantalum particle having dielectric layer to be formed from the teeth outwards forms polymeric layer; And the tantalum particle having polymeric layer to be formed on the surface is immersed in polymer suspension to carry out chemistry reformation.
4, paper " technical research of polymer cathode tantalum electrolytic capacitor tunicle ", author Yang Wenyao etc., deliver publication " functional material " 03 phase in 2011, this paper studies using conducting polymer PEDOT as the organic chip solid tantalum electrolytic capacitor of the low ESR of the high frequency of cathode material by membrane technology, discuss different polymerization temperatures, doping content and drive solubility temperature to the impact reducing chip-type solid tantalum electrolytic capacitor ESR.Result of study show when polymerization temperature be 0 ~ 10 DEG C, doping content is 3% (W), drive solubility temperature 80 DEG C time, adulterate the main chain obtaining densification effective PE-DOT rete, thus obtain lower ESR, and show, than MnO2 chip tantalum capacitor, there is better frequency characteristic.
Though these documents above-mentioned all relate to or include organic polymer negative electrode tantalum capacitor, but all do not mention how to change existing for present organic polymer negative electrode tantalum capacitor poorly sealed, voltage and the too small problem of range of capacity, so how to improve voltage and the range of capacity of organic polymer negative electrode tantalum capacitor, and necessary improvement is carried out to existing packaged type, still need to be studied further.
Summary of the invention
Object of the present invention is exactly poorly sealed existing for current organic polymer negative electrode tantalum capacitor, voltage and the too small problem of range of capacity, a kind of new polymer tantalum capacitor and preparation method thereof is proposed, this kind of polymer tantalum capacitor and preparation method thereof can solve existing for current organic polymer negative electrode tantalum capacitor poorly sealed effectively, voltage and the too small problem of range of capacity.
The present invention solves the technical scheme that its technical problem takes:
A kind of packed by metal casing polymer tantalum capacitor, comprises negative electrode, anode and metal shell, and shell adopts insulator sealing; Described anode has tantalum core and tantalum wire, and is drawn out to outside housing by tantalum wire; Described negative electrode is that organic polymer is formed, the negative electrode that organic polymer is formed is wrapped on tantalum core, and be fixed in closed metal shell by scolding tin or silver paste, its feature is, described tantalum core is cylinder, and have circular arc chamfering at the two ends of tantalum core column, to form the organic polymer cathode layer of thickness uniformity, turning rounding off in the appearance of tantalum core, effectively can eliminate negative and positive the two poles of the earth point discharge effect in the energized state, that reduces product punctures inefficacy ratio, improves the reliability of product; In addition, described organic polymer cathode layer is provided with graphite linings and silver slurry layer, and graphite linings and silver slurry layer are wrapped on the outer surface of organic polymer cathode layer, so that effective extraction of capacity.
Further, described tantalum wire is drawn from tantalum core, weld together at capacitor internal and anode lead wire, anode lead wire is through the insulator being arranged on metal shell upper surface, reached outside capacitor by the centre bore of insulator, and undertaken hermetically sealed by scolding tin mode between anode lead wire and insulator.
Further, described tantalum wire is drawn from tantalum core, tantalum wire is directly through the insulator being arranged on metal shell upper surface, reach outside capacitor by the centre bore of insulator, be connected with anode lead wire stretching out insulator port, and anode lead wire and tantalum wire and insulator three are undertaken hermetically sealedly welding together by the argon fluorine mode of weldering at insulator port.
Further, described organic polymer material is polythiophene or polypyrrole.
Further, the two ends of described tantalum core column have circular arc chamfering to be R=1.5-3.0mm, and during to ensure to make, chamfering is as the criterion with being convenient in demoulding.
Prepare a method for packed by metal casing polymer tantalum capacitor, at least comprise following steps:
(1) anode preparation
Select tantalum metal powder, the particle size of tantalum metal powder controls, between 3-8 μ, tantalum metal powder to be pressed into column, and carries out circular arc chamfering at the two ends of column, sinters porous matrix into, be prepared into tantalum core under high temperature and vacuum condition;
(2) deielectric-coating is formed
Select electrolyte be boric acid, nitric acid, phosphoric acid, ammonium dihydrogen phosphate or ethylene glycol and so on the aqueous solution as formation liquid, with the coating-forming voltage of rated voltage 2 ~ 5 times, the current density of 5 ~ 50mA carries out constant current boost, constant-pressure drop stream is carried out again after pressure, then heat-treat under the high temperature of 300 DEG C ~ 450 DEG C, form tantalum pentoxide deielectric-coating;
(3) organic polymer negative electrode preparation
The tantalum core having formed deielectric-coating is put into the container that organic polymer monomer is housed flood, and at polymerized at normal temperature, repeatable operation forms cathode layer, then carry out graphite linings and silver slurry layer dipping or apply, to draw capacitance.
(4) capacitor is assembled
The tantalum pellet silver paste of capped organic polymer cathode layer or scolding tin are encapsulated, added metal shell, with insulator sealing, anode tap through insulator, the pad of tantalum wire and anode tap at capacitor internal, anode tap and insulator solder up.
Prepare a method for packed by metal casing polymer tantalum capacitor, at least comprise following steps:
(1) anode preparation
Select tantalum metal powder, the particle size of tantalum metal powder controls, between 3-8 μ, tantalum metal powder to be pressed into column, and carries out circular arc chamfering at the two ends of column, sinters porous matrix into, be prepared into tantalum core under high temperature and vacuum condition;
(2) deielectric-coating is formed
Select electrolyte be boric acid, nitric acid, phosphoric acid, ammonium dihydrogen phosphate or ethylene glycol and so on the aqueous solution as formation liquid, with the coating-forming voltage of rated voltage 2 ~ 5 times, the current density of 5 ~ 50mA carries out constant current boost, constant-pressure drop stream is carried out again after pressure, then heat-treat under the high temperature of 300 DEG C ~ 450 DEG C, form tantalum pentoxide deielectric-coating;
(3) organic polymer negative electrode preparation
The tantalum core having formed deielectric-coating is put into the container that organic polymer monomer is housed flood, and at polymerized at normal temperature, repeatable operation forms cathode layer, then carry out graphite linings and silver slurry layer dipping or apply, to draw capacitance.
(4) capacitor is assembled
The tantalum pellet silver paste of capped organic polymer cathode layer or scolding tin are encapsulated, added metal shell, with insulator sealing, tantalum wire is through insulator, and the pad of tantalum wire and anode tap is outside at capacitor, tantalum wire and insulator solder up.
Beneficial effect of the present invention is:
1, the invention provides a kind of packed by metal casing polymer tantalum capacitor that effectively can substitute non-solid tantalum electrolytic capacitor, the product vacancy problem that effectively can solve the field forbiddings such as present domestic space flight, aviation or occur after limiting the use of the non-solid tantalum electrolytic capacitor of argent shell encapsulation.
2, be resin-moldedly packaged with compared with organic polymer negative electrode tantalum capacitor with of the prior art, the present invention adopts packed by metal casing, inner pellet is carried out hermetically sealed, the adverse effect that chip makes moist, impurity enters capacitor internal and produce product electrical property can be avoided.
3, the present invention is by selecting the tantalum metal powder of greater particle size, makes the tantalum core that can form larger specific volume when sintering, can provide the product that operating voltage is higher, capacity is larger.
4, take silver slurry layer and the double-deck binder course of graphite linings to be pasted with organic polymer cathode layer, have laminating closely, firm feature, effectively can improve the punch-through between negative electrode and positive electrode.
Accompanying drawing explanation
Fig. 1 is vertical section structural map and the vertical view of the cylindrical anode tantalum pellet of a kind of packed by metal casing polymer tantalum capacitor of the present invention
1: tantalum wire; 2: tantalum core.
Fig. 2 is vertical section structural map and the vertical view of the cylinder shape belt chamfering anode tantalum pellet of a kind of packed by metal casing polymer tantalum capacitor of the present invention
1: tantalum wire; 2: tantalum core; 11: chamfering.
Fig. 3 is the vertical section structural map of a kind of insulator scolding tin seal type structure of the present invention
1: tantalum wire; 2: tantalum core; 3: shell; 4: insulator; 5: scolding tin seals;
6: scolding tin or silver paste; 7: pad; 8: cathode; 9: deielectric-coating; 10: anode tap.
Fig. 4 is the vertical section structural map of a kind of insulator argon fluorine weldering seal type structure of the present invention
1: tantalum wire; 2: tantalum core; 3: shell; 4: insulator; 6: scolding tin or silver paste;
7: pad; 8: cathode; 9: deielectric-coating; 10: anode tap.
Embodiment
Form by the following examples, foregoing of the present invention is described in further detail again, but this should be interpreted as that the scope of this bright above-mentioned theme is only limitted to following example, all technology realized based on foregoing of the present invention, all belong to scope of the present invention.
Below in conjunction with drawings and Examples, this explanation is further illustrated.
Embodiment one one kinds of packed by metal casing polymer tantalum capacitors and preparation method thereof
As shown in accompanying drawing 1,3, a kind of packed by metal casing polymer tantalum capacitor, comprise by the tantalum wire 1 in the obtained anode of tantalum core 2, anode, cover the deielectric-coating 9 on anode, anode tap 10, negative electrode 8, shell 3, described negative electrode 8 adopts organic polymer material, shell 3 is metal, and shell 3 adopts insulator 4 to seal, and capacitor is full-closed structure.Described tantalum core 1 is cylindrical.Described anode tap 10 is through insulator 4, and the pad 7 of tantalum wire 1 and anode tap 10 is at capacitor internal, and described anode tap 10 and insulator 4 solder up 5, solder up mode is scolding tin sealing.Described metal is silver.Described organic polymer material is polypyrrole.Described organic polymer material covers deielectric-coating skin.Described shell is by the employing silver paste of the tantalum pellet encapsulation of coating good organic polymer cathode layer or scolding tin 6.
Described packed by metal casing polymer tantalum capacitor and preparation method thereof:
(1) select tantalum metal powder, the particle size of tantalum metal powder controls, between 3-8 μm, to be pressed into by tantalum metal powder cylindrical, sinters porous matrix into, be prepared into tantalum core under high temperature and vacuum condition;
(2) deielectric-coating is formed
Select electrolyte be boric acid, nitric acid, phosphoric acid, ammonium dihydrogen phosphate or ethylene glycol and so on the aqueous solution as formation liquid, with the coating-forming voltage of rated voltage 2 ~ 5 times, the current density of 5 ~ 50mA carries out constant current boost, constant-pressure drop stream is carried out again after pressure, then heat-treat under the high temperature of 300 DEG C ~ 450 DEG C, form tantalum pentoxide deielectric-coating;
(3) organic polymer negative electrode preparation
The tantalum core having formed deielectric-coating is put into the container that organic polymer monomer is housed flood, and at polymerized at normal temperature, repeatable operation forms cathode layer, then carry out graphite linings and silver slurry layer dipping or apply, to draw capacitance.
(4) capacitor is assembled
The tantalum pellet silver paste of capped organic polymer cathode layer or scolding tin are encapsulated, added metal shell, seals with insulator.Anode tap through insulator, the pad of tantalum wire and anode tap at capacitor internal, anode tap and insulator solder up.
Embodiment 21 kinds of packed by metal casing polymer tantalum capacitors
As shown in accompanying drawing 2,3, a kind of packed by metal casing polymer tantalum capacitor, comprise by the tantalum wire 1 in the obtained anode of tantalum core 2, anode, cover the deielectric-coating 9 on anode, anode tap 10, negative electrode 8, shell 3, described negative electrode 8 adopts organic polymer material, shell 3 is metal, and shell 3 adopts insulator 4 to seal, and capacitor is full-closed structure.Described tantalum core 1 is cylindrical, and has circular arc chamfering at the two ends of column, chamfering R=1.5mm.Described anode tap 10 is through insulator 4, and the pad 7 of tantalum wire 1 and anode tap 10 is at capacitor internal, and described anode tap 10 and insulator 4 solder up 5, solder up mode is scolding tin sealing.Described metal is copper.Described organic polymer material is polythiophene.Described organic polymer material covers deielectric-coating skin.Described shell is by the employing silver paste of the tantalum pellet encapsulation of coating good organic polymer cathode layer or scolding tin 6.
Embodiment 31 kinds of packed by metal casing polymer tantalum capacitors
As shown in accompanying drawing 2,3, a kind of packed by metal casing polymer tantalum capacitor, comprise by the tantalum wire 1 in the obtained anode of tantalum core 2, anode, cover the deielectric-coating 9 on anode, anode tap 10, negative electrode 8, shell 3, described negative electrode 8 adopts organic polymer material, shell 3 is metal, and shell 3 adopts insulator 4 to seal, and capacitor is full-closed structure.Described tantalum core 1 is cylindrical, and has circular arc chamfering at the two ends of column, chamfering R=3.0mm.Described anode tap 10 is through insulator 4, and the pad 7 of tantalum wire 1 and anode tap 10 is at capacitor internal, and described anode tap 10 and insulator 4 solder up 5, solder up mode is scolding tin sealing.Described metal is tantalum.Described organic polymer material is polythiophene.Described organic polymer material covers deielectric-coating skin.Described shell is by the employing silver paste of the tantalum pellet encapsulation of coating good organic polymer cathode layer or scolding tin 6.
Embodiment 41 kinds of packed by metal casing polymer tantalum capacitors
As shown in accompanying drawing 2,3, a kind of packed by metal casing polymer tantalum capacitor, comprise by the tantalum wire 1 in the obtained anode of tantalum core 2, anode, cover the deielectric-coating 9 on anode, anode tap 10, negative electrode 8, shell 3, described negative electrode 8 adopts organic polymer material, shell 3 is metal, and shell 3 adopts insulator 4 to seal, and capacitor is full-closed structure.Described tantalum core 1 is cylindrical, and has circular arc chamfering at the two ends of column, chamfering R=2.0mm.Described anode tap 10 is through insulator 4, and the pad 7 of tantalum wire 1 and anode tap 10 is at capacitor internal, and described anode tap 10 and insulator 4 solder up 5, solder up mode is scolding tin sealing.Described metal is aluminium.Described organic polymer material is polypyrrole.Described organic polymer material covers deielectric-coating skin.Described shell is by the employing silver paste of the tantalum pellet encapsulation of coating good organic polymer cathode layer or scolding tin 6.
Embodiment kind on May Day packed by metal casing polymer tantalum capacitor and preparation method thereof
As shown in accompanying drawing 1,4, a kind of packed by metal casing polymer tantalum capacitor, comprise by the tantalum wire 1 in the obtained anode of tantalum core 2, anode, cover the deielectric-coating 9 on anode, anode tap 10, negative electrode 8, shell 3, described negative electrode 8 adopts organic polymer material, shell 3 is metal, and shell 3 adopts insulator 4 to seal, and capacitor is full-closed structure.Described tantalum core 1 is cylindrical.Described tantalum wire 1 is through insulator, and described tantalum wire 1 welds with insulator 4, anode tap 10, and tantalum wire 1 is outside at capacitor with the pad 7 of anode tap 10, and solder up mode is argon fluorine sealing mouth.In this programme, the pad of tantalum wire and anode tap can not be left in metal shell, and anode tap of burn-oning again after argon fluorine sealing mouth, the advantage of this structure is: the lead solder-joint between the anode tap that the tantalum wire in (1) anode pellet is connected with outside is away from anode pellet end face, the big current produced in pinpoint welding procedure and the destruction of spark to organic polymer negative electrode less, the stability of product can be improved; (2) lead solder-joint of tantalum wire and anode tap is outside metal shell, shell space can not be taken, therefore anode pellet upper surface as far as possible close to insulator, can increase the design height of anode pellet, to obtain the product of more high-capacitance when equal overall dimension.
Described metal is any one in silver, copper, tantalum or aluminium.Preferably, described organic polymer material is polythiophene or polypyrrole.Described organic polymer material covers deielectric-coating skin.Described shell is by the employing silver paste of the tantalum pellet encapsulation of coating good organic polymer cathode layer or scolding tin 6.
Described organic polymer negative electrode tantalum capacitor and preparation method thereof:
(1) select tantalum metal powder, the particle size of tantalum metal powder controls, between 3-8 μ, tantalum metal powder to be pressed into column, and carries out circular arc chamfering at the two ends of column, sinters porous matrix into, be prepared into tantalum core under high temperature and vacuum condition;
(2) deielectric-coating is formed
Select electrolyte be boric acid, nitric acid, phosphoric acid, ammonium dihydrogen phosphate or ethylene glycol and so on the aqueous solution as formation liquid, with the coating-forming voltage of rated voltage 2 ~ 5 times, the current density of 5 ~ 50mA carries out constant current boost, constant-pressure drop stream is carried out again after pressure, then heat-treat under the high temperature of 300 DEG C ~ 450 DEG C, form tantalum pentoxide deielectric-coating;
(3) organic polymer negative electrode preparation
The tantalum core having formed deielectric-coating is put into the container that organic polymer monomer is housed flood, and at polymerized at normal temperature, repeatable operation forms cathode layer, then carry out graphite linings and silver slurry layer dipping or apply, to draw capacitance.
(4) capacitor is assembled
The tantalum pellet silver paste of capped organic polymer cathode layer or scolding tin are encapsulated, added metal shell, seals with insulator.Tantalum wire is through insulator, and the pad of tantalum wire and anode tap is outside at capacitor, tantalum core and insulator solder up.
Embodiment 61 kinds of packed by metal casing polymer tantalum capacitors
A kind of packed by metal casing polymer tantalum capacitor, comprise the anode, the tantalum wire in anode that are obtained by tantalum core, cover the deielectric-coating on anode, anode tap, negative electrode, shell, described negative electrode adopts organic polymer material, and shell is metal.Described shell adopts insulator sealing, and capacitor is full-closed structure.Described tantalum core is cylindrical chamfering structure.Described tantalum wire is through insulator, and the pad of tantalum wire and anode tap is outside at capacitor, and described tantalum wire and insulator solder up, solder up mode is argon fluorine sealing mouth.Described metal is any one in silver, copper, tantalum or aluminium.Described organic polymer material is polythiophene or polypyrrole.Described organic polymer material covers deielectric-coating skin.Described shell is by the employing silver paste of the tantalum pellet encapsulation of coating good organic polymer cathode layer or scolding tin.
Embodiment seven non-solid tantalum electrolytic capacitor and packed by metal casing polymer tantalum capacitor equivalent series resistance (ESR) contrast
A kind of tantalum capacitor, comprise the anode, the tantalum wire in anode that are obtained by tantalum core, cover the deielectric-coating on anode, anode tap, negative electrode, shell, described negative electrode adopts organic polymer material, and shell is metal.Described shell adopts insulator sealing, and capacitor is full-closed structure.Described tantalum core is cylindrical chamfering structure, and this structure effectively can eliminate product point effect in the energized state, and that reduces product punctures inefficacy ratio, improves performance and the reliability of product.
Described tantalum wire is through insulator, and the pad of tantalum wire and anode tap is outside at capacitor, and described tantalum wire and insulator solder up, solder up mode is argon fluorine sealing mouth.Described metal is any one in silver, copper, tantalum or aluminium.Preferably, described organic polymer material is polythiophene or polypyrrole.Described organic polymer material covers deielectric-coating skin.Described shell is by the employing silver paste of the tantalum pellet encapsulation of coating good organic polymer cathode layer or scolding tin.
Can find out according to above-described embodiment, the present invention is a kind of by the tantalum capacitor of organic polymer as negative electrode, comprises negative electrode and anode and metal shell; Described anode by tantalum core and tantalum wire, and is drawn out to outside housing by tantalum wire; Described negative electrode is that organic polymer is formed, the negative electrode that organic polymer is formed is wrapped on tantalum core, and be fixed in closed metal shell by scolding tin or silver paste, its feature is, described tantalum core is column, and have circular arc chamfering at the two ends of tantalum core column, to form the organic polymer cathode layer of thickness uniformity, turning rounding off in the appearance of tantalum core, effectively can eliminate negative and positive the two poles of the earth point discharge effect in the energized state, that reduces product punctures inefficacy ratio, improves the reliability of product; In addition, described organic polymer cathode layer is provided with graphite linings and silver slurry layer, and graphite linings and silver slurry layer are wrapped on the outer surface of organic polymer cathode layer, so that effective extraction of capacity.As follows with the contrast of conventional non-solid tantalum electrolytic capacitor:
Packed by metal casing polymer tantalum capacitor negative electrode adopts conducting polymer composite, and its conductivity is that 1 ~ 100S/cm, ESR value is extremely low.Table 1 is that non-solid tantalum electrolytic capacitor and packed by metal casing polymer tantalum capacitor SR contrast (frequency 100kHz):
Table 1 non-solid tantalum electrolytic capacitor and packed by metal casing polymer tantalum capacitor ESR contrast
Embodiment eight non-solid tantalum electrolytic capacitor and packed by metal casing polymer tantalum capacitor capacity comparison
The raising of organic polymer cathode conductivity improves the high frequency performance of capacitor greatly, before frequency is 100 kHz, the bust of capacitance is very little, table 2 be non-solid tantalum electrolytic capacitor and packed by metal casing polymer tantalum capacitor capacity with frequency change situation:
Table 2 non-solid tantalum electrolytic capacitor and packed by metal casing polymer tantalum capacitor capacity are with frequency change situation
Embodiment nine non-solid tantalum electrolytic capacitor and packed by metal casing polymer tantalum capacitor low temperature capacity contrast
Packed by metal casing polymer tantalum capacitor is because instead of gel-like electrolyte as negative electrode with conducting high polymers thing, there will not be solidification phenomenon at low temperatures, electric conductivity is better than gel electrolyte simultaneously, therefore possess better cryogenic property and high frequency characteristics than non-solid tantalum electrolytic capacitor, effectively can substitute non-solid tantalum electrolytic capacitor.Table 3 is that two kinds of products contrast (unit: μ F)-55 DEG C of low temperature capacity
Table 3 non-solid tantalum electrolytic capacitor and packed by metal casing polymer tantalum capacitor-55 DEG C of low temperature capacity contrast
Claims (10)
1. a packed by metal casing polymer tantalum capacitor, comprise the anode, the tantalum wire in anode that are obtained by tantalum core, cover the deielectric-coating on anode, anode tap, negative electrode, shell, it is characterized in that: described negative electrode adopts organic polymer material, shell is metal, and shell adopts insulator sealing.
2. packed by metal casing polymer tantalum capacitor according to claim 1, is characterized in that: the organic polymer material that described negative electrode adopts is polythiophene or polypyrrole.
3. packed by metal casing polymer tantalum capacitor according to claim 1, is characterized in that: described tantalum core is cylindrical.
4. packed by metal casing polymer tantalum capacitor according to claim 1, is characterized in that: described tantalum core is cylindrical chamfering structure.
5., according to the arbitrary described packed by metal casing polymer tantalum capacitor of claim 3 or 4, it is characterized in that: described anode tap is through insulator, and the pad of tantalum wire and anode tap is at capacitor internal; Described anode tap and insulator welding manner are that scolding tin seals.
6. according to the arbitrary described packed by metal casing polymer tantalum capacitor of claim 3 or 4, it is characterized in that: described tantalum wire is through insulator, and the pad of tantalum wire and anode tap is outside at capacitor; Described tantalum wire and insulator welding manner are argon fluorine sealing mouth.
7. packed by metal casing polymer tantalum capacitor according to claim 1, is characterized in that: described metal is any one in silver, copper, tantalum or aluminium.
8. packed by metal casing polymer tantalum capacitor according to claim 1, is characterized in that: described organic polymer material covers deielectric-coating skin; The tantalum pellet encapsulation of coating good organic polymer cathode layer is adopted silver paste or scolding tin by described shell.
9. prepare a method for packed by metal casing polymer tantalum capacitor described in claim 5, it is characterized in that comprising following steps:
(1) anode preparation
Select tantalum metal powder, be pressed into cylindrical or cylindrical chamfering structure, under high temperature and vacuum condition, sinter porous matrix into;
(2) deielectric-coating is formed
Select electrolyte be boric acid, nitric acid, phosphoric acid, ammonium dihydrogen phosphate or ethylene glycol and so on the aqueous solution as formation liquid, with the coating-forming voltage of rated voltage 2 ~ 5 times, the current density of 5 ~ 50mA is carried out constant current boost, after pressure, is carried out constant-pressure drop stream again, then heat-treat under the high temperature of 300 DEG C ~ 450 DEG C, form tantalum pentoxide deielectric-coating;
(3) organic polymer negative electrode preparation
The tantalum pellet having formed deielectric-coating is placed with in organic polymer monomer carry out flooding, polymerized at normal temperature, repeatable operation forms cathode layer, then carries out graphite linings and silver slurry layer dipping or coating, to draw capacitance;
(4) capacitor is assembled
The tantalum pellet silver paste of capped organic polymer cathode layer or scolding tin are encapsulated, added metal shell, seals with insulator; Anode tap through insulator, the pad of tantalum wire and anode tap at capacitor internal, anode tap and insulator solder up.
10. prepare a method for packed by metal casing polymer tantalum capacitor described in claim 6, it is characterized in that comprising following steps:
(1) anode preparation
Select tantalum metal powder, be pressed into cylindrical or cylindrical chamfering structure, under high temperature and vacuum condition, sinter porous matrix into, be prepared into tantalum core;
(2) deielectric-coating is formed
Select electrolyte be boric acid, nitric acid, phosphoric acid, ammonium dihydrogen phosphate or ethylene glycol and so on the aqueous solution as formation liquid, with the coating-forming voltage of rated voltage 2 ~ 5 times, the current density of 5 ~ 50mA is carried out constant current boost, after pressure, is carried out constant-pressure drop stream again, then heat-treat under the high temperature of 300 DEG C ~ 450 DEG C, form tantalum pentoxide deielectric-coating;
(3) organic polymer negative electrode preparation
The tantalum pellet having formed deielectric-coating is placed with in organic polymer monomer carry out flooding, polymerized at normal temperature, repeatable operation forms cathode layer, then carries out graphite linings and silver slurry layer dipping or coating, to draw capacitance;
(4) capacitor is assembled
The tantalum pellet silver paste of capped organic polymer cathode layer or scolding tin are encapsulated, added metal shell, seals with insulator; Tantalum wire is through insulator, and the pad of tantalum wire and anode tap is outside at capacitor, tantalum wire and insulator solder up.
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| CN105590750A (en) * | 2016-03-17 | 2016-05-18 | 山东交通学院 | Ceramic capacitor |
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| CN111416159A (en) * | 2020-03-18 | 2020-07-14 | 浙江大学 | Novel liquid metal battery capable of adjusting output voltage and current magnitude and direction |
| CN115223798A (en) * | 2022-07-29 | 2022-10-21 | 长春维鸿东光电子器材有限公司 | Manufacturing method of axially-led organic polymer tantalum fixed capacitor |
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| CN108054010A (en) * | 2017-12-15 | 2018-05-18 | 株洲中电电容器有限公司 | A kind of hermetically sealed Metal Packaging high molecular polymer tantalum capacitor of axial direction |
| CN111416159A (en) * | 2020-03-18 | 2020-07-14 | 浙江大学 | Novel liquid metal battery capable of adjusting output voltage and current magnitude and direction |
| CN115223798A (en) * | 2022-07-29 | 2022-10-21 | 长春维鸿东光电子器材有限公司 | Manufacturing method of axially-led organic polymer tantalum fixed capacitor |
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