CN112420391A - Solid-state aluminum electrolytic capacitor resistant to large current impact and preparation method thereof - Google Patents
Solid-state aluminum electrolytic capacitor resistant to large current impact and preparation method thereof Download PDFInfo
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- 239000003990 capacitor Substances 0.000 title claims abstract description 45
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 38
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 38
- 238000002360 preparation method Methods 0.000 title description 7
- 239000011888 foil Substances 0.000 claims abstract description 37
- 239000003792 electrolyte Substances 0.000 claims abstract description 26
- 229920000223 polyglycerol Polymers 0.000 claims abstract description 20
- 229920000642 polymer Polymers 0.000 claims abstract description 18
- 238000005470 impregnation Methods 0.000 claims description 68
- 239000007788 liquid Substances 0.000 claims description 30
- 229920001940 conductive polymer Polymers 0.000 claims description 20
- 239000003795 chemical substances by application Substances 0.000 claims description 15
- 229920001609 Poly(3,4-ethylenedioxythiophene) Polymers 0.000 claims description 11
- 238000001035 drying Methods 0.000 claims description 11
- 239000006087 Silane Coupling Agent Substances 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 10
- QGZKDVFQNNGYKY-UHFFFAOYSA-O Ammonium Chemical compound [NH4+] QGZKDVFQNNGYKY-UHFFFAOYSA-O 0.000 claims description 9
- LYCAIKOWRPUZTN-UHFFFAOYSA-N Ethylene glycol Chemical compound OCCO LYCAIKOWRPUZTN-UHFFFAOYSA-N 0.000 claims description 8
- 239000002904 solvent Substances 0.000 claims description 8
- 238000004140 cleaning Methods 0.000 claims description 6
- 238000007654 immersion Methods 0.000 claims description 6
- 229920000144 PEDOT:PSS Polymers 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 4
- 239000000654 additive Substances 0.000 claims description 4
- 230000000996 additive effect Effects 0.000 claims description 4
- 125000000217 alkyl group Chemical group 0.000 claims description 4
- FBPFZTCFMRRESA-KVTDHHQDSA-N D-Mannitol Chemical compound OC[C@@H](O)[C@@H](O)[C@H](O)[C@H](O)CO FBPFZTCFMRRESA-KVTDHHQDSA-N 0.000 claims description 3
- 229930195725 Mannitol Natural products 0.000 claims description 3
- OTRAYOBSWCVTIN-UHFFFAOYSA-N OB(O)O.OB(O)O.OB(O)O.OB(O)O.OB(O)O.N.N.N.N.N.N.N.N.N.N.N.N.N.N.N Chemical compound OB(O)O.OB(O)O.OB(O)O.OB(O)O.OB(O)O.N.N.N.N.N.N.N.N.N.N.N.N.N.N.N OTRAYOBSWCVTIN-UHFFFAOYSA-N 0.000 claims description 3
- 230000032683 aging Effects 0.000 claims description 3
- GJYJYFHBOBUTBY-UHFFFAOYSA-N alpha-camphorene Chemical compound CC(C)=CCCC(=C)C1CCC(CCC=C(C)C)=CC1 GJYJYFHBOBUTBY-UHFFFAOYSA-N 0.000 claims description 3
- KLIDOSBTXDALBI-UHFFFAOYSA-N ammonium nonanoate Chemical compound [NH4+].CCCCCCCCC([O-])=O KLIDOSBTXDALBI-UHFFFAOYSA-N 0.000 claims description 3
- 229940067597 azelate Drugs 0.000 claims description 3
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 claims description 3
- 239000004327 boric acid Substances 0.000 claims description 3
- 229910002804 graphite Inorganic materials 0.000 claims description 3
- 239000010439 graphite Substances 0.000 claims description 3
- 235000010355 mannitol Nutrition 0.000 claims description 3
- 239000000594 mannitol Substances 0.000 claims description 3
- BDJRBEYXGGNYIS-UHFFFAOYSA-N nonanedioic acid Chemical compound OC(=O)CCCCCCCC(O)=O BDJRBEYXGGNYIS-UHFFFAOYSA-N 0.000 claims description 3
- FBUKVWPVBMHYJY-UHFFFAOYSA-M nonanoate Chemical compound CCCCCCCCC([O-])=O FBUKVWPVBMHYJY-UHFFFAOYSA-M 0.000 claims description 3
- BTJIUGUIPKRLHP-UHFFFAOYSA-M 4-nitrophenolate Chemical compound [O-]C1=CC=C([N+]([O-])=O)C=C1 BTJIUGUIPKRLHP-UHFFFAOYSA-M 0.000 claims description 2
- 239000002250 absorbent Substances 0.000 claims description 2
- 230000002745 absorbent Effects 0.000 claims description 2
- 239000007787 solid Substances 0.000 abstract description 12
- 230000008439 repair process Effects 0.000 abstract description 3
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 description 6
- 239000000243 solution Substances 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 4
- -1 Polytetrafluoroethylene Polymers 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 239000006185 dispersion Substances 0.000 description 4
- 239000004744 fabric Substances 0.000 description 4
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 4
- 239000004810 polytetrafluoroethylene Substances 0.000 description 4
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 3
- KFZMGEQAYNKOFK-UHFFFAOYSA-N Isopropanol Chemical compound CC(C)O KFZMGEQAYNKOFK-UHFFFAOYSA-N 0.000 description 3
- 238000009825 accumulation Methods 0.000 description 3
- 238000002791 soaking Methods 0.000 description 3
- 229910002601 GaN Inorganic materials 0.000 description 2
- JMASRVWKEDWRBT-UHFFFAOYSA-N Gallium nitride Chemical compound [Ga]#N JMASRVWKEDWRBT-UHFFFAOYSA-N 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000017525 heat dissipation Effects 0.000 description 2
- 230000007062 hydrolysis Effects 0.000 description 2
- 238000006460 hydrolysis reaction Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 150000004756 silanes Chemical class 0.000 description 2
- 229920002994 synthetic fiber Polymers 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 239000005046 Chlorosilane Substances 0.000 description 1
- KRHYYFGTRYWZRS-UHFFFAOYSA-M Fluoride anion Chemical compound [F-] KRHYYFGTRYWZRS-UHFFFAOYSA-M 0.000 description 1
- 239000004677 Nylon Substances 0.000 description 1
- BTHCBXJLLCHNMS-UHFFFAOYSA-N acetyloxysilicon Chemical compound CC(=O)O[Si] BTHCBXJLLCHNMS-UHFFFAOYSA-N 0.000 description 1
- 239000010407 anodic oxide Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- KOPOQZFJUQMUML-UHFFFAOYSA-N chlorosilane Chemical compound Cl[SiH3] KOPOQZFJUQMUML-UHFFFAOYSA-N 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000006482 condensation reaction Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- KPUWHANPEXNPJT-UHFFFAOYSA-N disiloxane Chemical class [SiH3]O[SiH3] KPUWHANPEXNPJT-UHFFFAOYSA-N 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 229920006283 heat-resistant synthetic fiber Polymers 0.000 description 1
- 230000003301 hydrolyzing effect Effects 0.000 description 1
- WGCNASOHLSPBMP-UHFFFAOYSA-N hydroxyacetaldehyde Natural products OCC=O WGCNASOHLSPBMP-UHFFFAOYSA-N 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 239000011244 liquid electrolyte Substances 0.000 description 1
- 229920002521 macromolecule Polymers 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000002121 nanofiber Substances 0.000 description 1
- 239000002736 nonionic surfactant Substances 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- PARWUHTVGZSQPD-UHFFFAOYSA-N phenylsilane Chemical compound [SiH3]C1=CC=CC=C1 PARWUHTVGZSQPD-UHFFFAOYSA-N 0.000 description 1
- 229920002239 polyacrylonitrile Polymers 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
- 239000012209 synthetic fiber Substances 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
- H01G9/15—Solid electrolytic capacitors
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
- H01G9/004—Details
- H01G9/022—Electrolytes; Absorbents
- H01G9/035—Liquid electrolytes, e.g. impregnating materials
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
- H01G9/004—Details
- H01G9/04—Electrodes or formation of dielectric layers thereon
- H01G9/048—Electrodes or formation of dielectric layers thereon characterised by their structure
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Fixed Capacitors And Capacitor Manufacturing Machines (AREA)
Abstract
A solid aluminum electrolytic capacitor resistant to large current impact comprises a core package consisting of anode foil, electrolytic paper and cathode foil, wherein a conductive high molecular polymer is formed between the anode foil and the cathode foil on the core package, a gap inside the conductive high molecular polymer and a gap between the conductive high molecular polymer and the anode foil and the cathode foil contain electrolyte, and the outer layer of the core package contains soaked polyglycerol. In the invention, the electrolyte can repair the oxide film on the surface of the anode foil, and simultaneously, under the action of the polyglycerol, the solid aluminum electrolytic capacitor has excellent heavy current resistance.
Description
Technical Field
The invention relates to a solid-state aluminum electrolytic capacitor, in particular to a solid-state aluminum electrolytic capacitor resistant to large current impact and a preparation method thereof.
Background
With the digitization of electronic products, the current output loops, especially in the fields of ai machines, electric vehicles, vehicle-mounted electronics, navigation, vehicle-mounted fast-charging automobile devices, medical electronics and the like, have higher and higher demands for high reliability, and have special requirements for miniaturization, high capacity, low ESR, low LC and the like, instantaneous large current impact resistance and repeated charging and discharging. The liquid electrolytic capacitor has a slow speed and a large resistance value because the liquid electrolytic capacitor conducts ions in the liquid electrolyte in a conducting mode, and can internally consume certain current impact. Even if the solvent of the electrolyte is not volatilized, the oxidizable film and the negative foil are insulated and isolated by the electrolytic paper, so that the failure mode of the capacitor is an open circuit and is not short-circuited. The traditional solid aluminum electrolytic capacitor has the advantages of low ESR, low internal resistance, conductivity which is approximately 10000 times faster than that of the traditional solid aluminum electrolytic capacitor, but weak capability of repairing the defect part of the anodic oxide film. And the internal resistance of the device is small, and when the device is impacted by instantaneous current and charge and discharge, the energy accumulation is easy to cause the breakage of a high molecular chain to cause short circuit failure.
With the development of the communication field, 65W gallium nitride fast charge is already tried at present, but the traditional solid-state aluminum electrolytic capacitor cannot be applied to the output end of the 65W gallium nitride fast charge, and mainly cannot meet the characteristic of large current impact.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a solid-state aluminum electrolytic capacitor which can repair an oxide film on an anode foil and has good heat dissipation effect and high current impact resistance and a preparation method thereof.
In order to solve the technical problems, the technical scheme provided by the invention is as follows: a solid-state aluminum electrolytic capacitor resistant to large-current impact comprises a core package consisting of anode foil, electrolytic paper and cathode foil, wherein a conductive high polymer is formed between the anode foil and the cathode foil on the core package, electrolyte is soaked in gaps inside the conductive high polymer and gaps among the conductive high polymer, the anode foil and the cathode foil, and polyglycerol is soaked in the outer layer of the core package.
Preferably, the conductive high molecular polymer is PEDOT/PSS, and the PEDOT/PSS is configured in a ratio of 4: 1.
In the solid-state aluminum electrolytic capacitor resistant to high current impact, preferably, the electrolyte comprises a solvent and a solute, and the solvent comprises ethylene glycol; the solute comprises one or more of ammonium pelargonate, boric acid, ammonium azelate, ammonium pentaborate, mannitol and ammonium alkyl pelargonate; the additive comprises one or more of ammonium p-nitrophenylate, ammonium hypophosphite and graphite.
In the solid aluminum electrolytic capacitor resistant to large current impact, preferably, the core package is impregnated with a pretreatment agent before the conductive polymer is impregnated into the core package, and the pretreatment agent includes a silane coupling agent.
A preparation method of a solid-state aluminum electrolytic capacitor resistant to large current impact comprises the following steps:
1) forming the core bag, cleaning and drying;
2) impregnating the core wrap treated in the step 1) with a pretreatment agent, and drying;
3) impregnating the core bag impregnated with the pretreatment agent with a high-molecular conductive polymer, wherein the high-molecular conductive polymer adopts PEDOT (Polytetrafluoroethylene)/PSS (Polytetrafluoroethylene/PSS) which is configured in a ratio of 4: 1;
4) impregnating with electrolyte;
5) directly impregnating polyglycerol after the step 4) is impregnated with the electrolyte;
and (3) a polyglycerol impregnation step: the first step is as follows: vacuumizing to-65 KPa before contacting with the immersion liquid, and standing for 5-10 min. The second step is that: contacting polyglycerol solution at 1/3 position of height of the essence, and keeping for 3-10min (adjusting according to the volume of the essence). The third step: keeping the prime particles leaving the impregnation liquid for 3-5 min. The fourth step: the vegetarian food is lowered to 2/3 position in the immersion liquid for 3-10min (adjusted according to the vegetarian food volume). The fifth step: continuously separating the element from the impregnation liquid surface for 3-5 min. And a sixth step: soaking the essence in the soaking solution completely, and maintaining for 3-10min (adjusting according to the volume of the essence). The seventh step: keeping the extract separated from the soaking solution for 3-5 min. Eighth step: after breaking the vacuum, the excess liquid was removed by using a paper towel.
6) Assembling, cleaning and aging.
In the preparation method of the solid aluminum electrolytic capacitor resistant to large current impact, preferably, the impregnated high molecular conductive polymer is impregnated for multiple times, wherein the multiple impregnation comprises first impregnation and second impregnation; the first impregnation time is 2 minutes, and the temperature is normal temperature; directly drying at the temperature of 120-180 ℃ for 20-40 minutes after the first impregnation is finished; the second impregnation is performed in the same way as the first impregnation.
In the above method for manufacturing a solid aluminum electrolytic capacitor resistant to large current impact, preferably, the immersion liquid is used to submerge at least the top of the core pack and at most half of the part B of the lead during the first and second impregnation.
In the above method for manufacturing a solid aluminum electrolytic capacitor resistant to large current impact, preferably, the first impregnation and the second impregnation include the following steps:
putting the core packet into the impregnation liquid for normal-temperature impregnation for 2 minutes;
In the preparation method of the solid aluminum electrolytic capacitor resistant to large current impact, preferably, the pretreatment agent in the step 2) is a silane coupling agent, and the impregnation time in the step 2) is 1-5 minutes, the temperature is 45-200 ℃, and the time is 1-3 hours.
In the invention, after the high molecular conductive polymer layer is formed on the core bag, the core bag is impregnated with the electrolyte, and the electrolyte can enter the gap inside the high molecular conductive polymer and the gap between the high molecular conductive polymer inside the core bag and the anode foil, so that the damaged dielectric film on the surface of the anode foil can be repaired, and the large-current impact resistance of the anode foil is improved. Meanwhile, in the invention, the core bag is internally impregnated with the electrolyte, so that the electrolyte can be used as a heat-conducting medium to timely transfer heat generated by the core bag.
In the invention, the outermost layer of the core package is impregnated with a layer of polyglycerol, and the macromolecular characteristic of the polyglycerol can prevent a part of heat from entering the core package when the aluminum electrolytic capacitor is welded on a circuit board. The temperature transferred to the aluminum electrolytic capacitor during welding can reach 200 to 300 ℃; the temperature is transferred to the core package, so that a gap is easily generated between the high-molecular conductive polymer and the anode foil, and under the impact of large current, the gap is expanded to reduce the capacity of the capacitor; under the characteristic of the macromolecule of the polyglycerol, when heat generated by welding is transferred to the core package, the temperature is reduced to more than 100 ℃, so that the core package is protected. Meanwhile, the polyglycerol on the outer layer of the core bag can also transfer the heat inside the core bag to the shell, so that the dispersion of the heat above the core bag is accelerated, and the large-current impact resistance of the capacitor is enhanced.
Detailed Description
In order to facilitate an understanding of the present invention, the present invention will be described more fully and in detail with reference to the preferred embodiments, but the scope of the present invention is not limited to the specific embodiments described below.
It should be particularly noted that when an element is referred to as being "fixed to, connected to or communicated with" another element, it can be directly fixed to, connected to or communicated with the other element or indirectly fixed to, connected to or communicated with the other element through other intermediate connecting components.
Unless otherwise defined, all terms of art used hereinafter have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of the present invention.
Example 1
A solid-state aluminum electrolytic capacitor resistant to large-current impact comprises a core package consisting of anode foil, electrolytic paper and cathode foil, wherein a conductive high polymer is formed between the anode foil and the cathode foil on the core package, electrolyte is soaked in gaps inside the conductive high polymer and gaps among the conductive high polymer, the anode foil and the cathode foil, and polyglycerol is soaked in the outer layer of the core package. In this embodiment, both the anode foil and the cathode foil are aluminum foils, and an oxide film is formed on the anode foil; the electrolytic paper is made of natural fiber fabric, synthetic fiber fabric, fabric and silk made of fibrous heat-resistant synthetic fiber, or fabric and silk made of nylon and polyacrylonitrile nanofiber.
In the embodiment, the conductive high molecular polymer adopts PEDOT: PSS which is configured in a ratio of 4: 1; during impregnation, directly impregnating PEDOT, namely PSS dispersion liquid; two impregnations are adopted.
In the embodiment, the electrolyte comprises a solvent, a solute and an additive, wherein the solvent is 80 parts by weight of glycol; the solute comprises 6 parts by weight of ammonium pelargonate, 2 parts by weight of boric acid, 1.5 parts by weight of ammonium azelate, 2 parts by weight of ammonium pentaborate, 2 parts by weight of mannitol and 5 parts by weight of ammonium alkyl pelargonate; the additive is 0.5 weight parts of ammonium p-nitroabenzoate, 0.3 weight parts of ammonium hypophosphite and 0.4 weight parts of graphite.
In this embodiment, before the core pack is impregnated with the conductive high molecular polymer, a pretreatment agent including a silane coupling agent is impregnated.
In this embodiment, the solvent of the pretreatment agent is mostly water, alcohol or a mixture of water and alcohol, and water containing no fluoride ion, and inexpensive and nontoxic ethanol and isopropyl alcohol are preferable. In addition to the amino-hydrocarbon silanes, acetic acid is added to the solution prepared from the other silanes as a hydrolysis catalyst and the pH is adjusted to 3.5-5.5. The long-chain alkyl and phenyl silane are not suitable for being prepared into an aqueous solution due to poor stability. The hydrolysis process of chlorosilane and acetoxy silane is accompanied by serious condensation reaction, and is not suitable for preparing aqueous solution or hydroalcoholic solution. For the silane coupling agent with poor water solubility, 0.1-0.2% (mass fraction) of nonionic surfactant can be added firstly, and then water is added to prepare the aqueous emulsion for use. In order to increase the economic efficiency of the hydrolytic stability of the products, silane coupling agents may also incorporate a proportion of non-carbon functional silanes. When the hardly sticky material is treated, a mixed silane coupling agent or a carbon-functional siloxane may be used. Mixing and doping ethyl acetate solution with ethyl acetate ratio of 3: 7-4: 6.
The pretreatment can be carried out on the surface of the anode foil, so that the speed and the quality of the impregnated high molecular conductive polymer are increased, because the molecular weight of the high molecular conductive polymer is generally between 5000-; therefore, the core package needs to be processed first, and the occurrence of the situation is reduced. The silane coupling agent can be connected with the high-molecular conductive polymer, so that impregnation of the high-molecular conductive polymer is accelerated.
In the invention, after the high molecular conductive polymer is formed on the core bag, the core bag is impregnated with the electrolyte; the electrolyte can repair the oxide film on the surface of the anode foil and can transfer heat. It is known that the outer surface of the conventional core pack is generally covered by electrolytic paper, on which a high molecular conductive polymer (PEDOT: PSS) is generally formed, but the PEDOT: PSS has a low thermal conductivity and limited ability to transfer heat, typically due to PEDOT: the PSS has small resistance, and cannot cause energy accumulation; but under the impact of large current, because the current is PEDOT: PSS has a low thermal conductivity, which leads to energy accumulation. In this embodiment, the electrolyte can transfer the accumulated energy to the outside of the core pack in a timely manner, i.e., above the polyglycerol.
In the solid-state aluminum electrolytic capacitor, the core pack is generally not in direct contact with the shell, so that the heat dissipation through the shell becomes difficult, and in the embodiment, the polyglycerol can transfer heat to the shell to dissipate the heat in time; under the impact of large current, due to PEDOT: the low electrical resistance of PSS, which is slow to accumulate heat inside the core package, provides the opportunity for the polyglycerol to transfer heat in a timely manner, unlike the transient high temperatures when soldering capacitors.
In this embodiment, a method for manufacturing a solid aluminum electrolytic capacitor resistant to large current impact is further provided, which is characterized by including the following steps:
1) forming the core bag, cleaning and drying;
2) impregnating the core wrap treated in the step 1) with a pretreatment agent, and drying; the pretreatment agent in the step 2 is a silane coupling agent, and the impregnation time in the step 2 is 1-5 minutes, the temperature is 45-200 ℃, and the time is 1-3 hours.
3) Impregnating the core bag impregnated with the pretreatment agent with a high-molecular conductive polymer, wherein the high-molecular conductive polymer adopts PEDOT (Polytetrafluoroethylene)/PSS (Polytetrafluoroethylene/PSS) which is configured in a ratio of 4: 1; the impregnated high molecular conductive polymer adopts multiple impregnation, and the multiple impregnation comprises first impregnation and second impregnation; the first impregnation time is 2 minutes, and the temperature is normal temperature; directly drying at the temperature of 120-180 ℃ for 20-40 minutes after the first impregnation is finished; the second impregnation is performed in the same way as the first impregnation.
And during the first impregnation and the second impregnation, the immersion liquid submerges at least the top of the core package and at most half of the part B of the guide pin. The first impregnation and the second impregnation comprise the following steps:
putting the core packet into the impregnation liquid for normal-temperature impregnation for 2 minutes;
4) Impregnating with electrolyte; the composition of the electrolyte has been described in detail above and will not be described further here.
5) Directly impregnating polyglycerol after the step 4) is impregnated with the electrolyte; after the polyglycerol is impregnated, the capacitor is placed at normal temperature for a period of time, and if suspended liquid drops exist at the bottom of the core bag, the suspended liquid drops are sucked to be dry by the liquid absorption paper, so that the smooth proceeding of subsequent assembly and colloidal particle penetrating actions is facilitated.
In this embodiment, the first impregnation, the second impregnation, the impregnation with the electrolyte and the impregnation with the polyglycerol are performed by impregnation at normal temperature and under negative pressure; the vacuum degree is-50 to-80 Kpa during impregnation.
6) Assembling, cleaning and aging.
In this embodiment, after the first impregnation and drying, the CAP is 50-52 μ F, the DF is 2.2%, the ESR is 35-40 m Ω, and the LC is less than 10 μ A. After the second impregnation and drying, the reference characteristics CAP are 54-57 muF, DF are 1.8-2%, and ESR is 25-30 m omega. Twice impregnation of PEDOT: after the PSS dispersion liquid is dried, the PSS dispersion liquid is impregnated with electrolyte without being dried, the reference characteristic CAP is 56-58 mu F, the DF is 1.5-1.9 m omega, the ESR is 22-30 m omega, and the LC is less than 10 mu A. The post-assembly properties show a slight decrease in DF and ESR.
Comparative example
In order to verify the effects of the present example, a comparative example was provided, in which impregnation with an electrolyte and impregnation with polyglycerol were not performed, and the rest was the same as example 1. For better analysis, the capacitor of example 1 was made into 10 solid-state aluminum electrolytic capacitors.
The solid aluminum electrolytic capacitor of the comparative example and the 10 solid aluminum electrolytic capacitors of example 1 were charged and discharged 2000 times at a voltage and current of 42V, 20A, and the data are as follows:
as can be seen from the above table, the solid-state aluminum electrolytic capacitor prepared in this embodiment is significantly better than the comparative example in terms of resistance to large current impact.
Claims (10)
1. A solid-state aluminum electrolytic capacitor resistant to large current impact is characterized in that: the core package comprises an anode foil, electrolytic paper and a cathode foil, wherein a conductive high molecular polymer is formed between the anode foil and the cathode foil on the core package, electrolyte is soaked in a gap inside the conductive high molecular polymer and a gap between the conductive high molecular polymer and the anode foil and a gap between the conductive high molecular polymer and the cathode foil, and the outer layer of the core package is soaked with polyglycerol.
2. The solid-state aluminum electrolytic capacitor resistant to large current impact according to claim 1, characterized in that: the conductive high polymer adopts PEDOT PSS which is configured in a ratio of 4: 1.
3. The solid-state aluminum electrolytic capacitor resistant to large current impact according to claim 1, characterized in that: the electrolyte comprises a solvent and a solute, and the solvent comprises ethylene glycol; the solute comprises one or more of ammonium pelargonate, boric acid, ammonium azelate, ammonium pentaborate, mannitol and ammonium alkyl pelargonate; the additive comprises one or more of ammonium p-nitrophenylate, ammonium hypophosphite and graphite.
4. The solid-state aluminum electrolytic capacitor resistant to large current impact according to claim 1, characterized in that: before the core bag is impregnated with the conductive high molecular polymer, the core bag is impregnated with a pretreatment agent, wherein the pretreatment agent comprises a silane coupling agent.
5. A method for preparing a solid-state aluminum electrolytic capacitor resistant to high current impact according to any one of claims 1 to 4, comprising the steps of:
1) forming the core bag, cleaning and drying;
2) impregnating the core wrap treated in the step 1) with a pretreatment agent, and drying;
3) impregnating the core bag impregnated with the pretreatment agent with a high-molecular conductive polymer, wherein the high-molecular conductive polymer adopts PEDOT (PEDOT: PSS);
4) impregnating with electrolyte;
5) directly impregnating polyglycerol after the step 4) is impregnated with the electrolyte;
6) assembling, cleaning and aging.
6. The method for preparing a solid-state aluminum electrolytic capacitor resistant to large current impact according to claim 5, characterized in that: the impregnated high molecular conductive polymer adopts multiple impregnation, and the multiple impregnation comprises first impregnation and second impregnation; the first impregnation time is 2 minutes, and the temperature is normal temperature; directly drying at the temperature of 120-180 ℃ for 20-40 minutes after the first impregnation is finished; the second impregnation is performed in the same way as the first impregnation.
7. The method for manufacturing a solid-state aluminum electrolytic capacitor resistant to large current impact according to claim 6, characterized in that: and during the first impregnation and the second impregnation, the immersion liquid submerges at least the top of the core package and at most half of the part B of the guide pin.
8. The method for manufacturing a solid-state aluminum electrolytic capacitor resistant to large current impact according to claim 7, characterized in that: the first impregnation and the second impregnation comprise the following steps:
putting the core packet into the impregnation liquid for normal-temperature impregnation for 2 minutes;
9. The method for preparing a solid-state aluminum electrolytic capacitor resistant to large current impact according to claim 5, characterized in that: the pretreatment agent in the step 2 is a silane coupling agent, and the impregnation time in the step 2 is 1-5 minutes, the temperature is 45-200 ℃, and the time is 1-3 hours.
10. The method for preparing a solid-state aluminum electrolytic capacitor resistant to large current impact according to claim 5, characterized in that: and in the step 3), the PEDOT to PSS is configured in a ratio of 4: 1.
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