Preparation method of ultra-large-capacity laminated aluminum capacitor

Abstract

The invention discloses a preparation method of an ultra-large-capacity laminated aluminum capacitor, and belongs to the field of capacitor preparation, and the method comprises the steps: 1, cutting a formed aluminum foil into aluminum foil sheets in a preset shape, welding the aluminum foil sheets on a process strip, cleaning the aluminum foil sheets, and forming the aluminum foil sheets in a formation liquid to obtain formed aluminum foil sheets; 2, coating the surface of the formed aluminum foil with a conductive high-molecular polymer, graphite and silver paste to form an ultra-large-capacity laminated aluminum capacitor monomer; step 3, performing stage aging and aging on the aluminum capacitor monomer to obtain an aged aluminum capacitor monomer; and step 4, the aged aluminum capacitor monomers are bonded and combined into an ultra-large-capacity aluminum capacitor core by using a conductive adhesive, the aluminum capacitor core is packaged after a positive electrode and a negative electrode are led out, and the ultra-large-capacity laminated aluminum capacitor is obtained. According to the method disclosed by the invention, stage aging and aging are carried out when the ultra-large-capacity laminated aluminum capacitor monomer is used, so that the ultra-large-capacity laminated aluminum capacitor which is good in qualified rate and high in reliability can be prepared at low cost.

Description

Technical Field

[0001] The invention belongs to the technical field of aluminum capacitor preparation, and mainly relates to a preparation method of an ultra-large capacity laminated aluminum capacitor. Background Art

[0002] With the development of electronic technology, various devices and circuits are developing towards thinness, which requires the size of capacitors to be thinner. However, the capacity of capacitors is required to be larger and larger. Conventional laminated aluminum capacitors can meet the trend of thinness, but cannot meet the capacity requirements. In order to increase the capacity, the size of a single capacitor unit needs to be continuously increased. At the same time, the shape of the capacitor unit is no longer limited to conventional shapes such as rectangles due to different requirements.

[0003] As the size of a single capacitor unit increases, the production cost caused by the pass rate will increase significantly, which is not conducive to the control of process costs and the development of multilayer aluminum capacitors.

[0004] In view of this, the present invention is proposed. Summary of the invention

[0005] The purpose of the present invention is to provide a method for preparing an ultra-large capacity laminated aluminum capacitor, which can prepare a laminated aluminum capacitor with a large single capacitor unit area, while reducing the production cost caused by the qualified rate, thereby solving the above-mentioned technical problems existing in the prior art.

[0006] The objective of the present invention is achieved through the following technical solutions:

[0007] A method for preparing an ultra-large capacity laminated aluminum capacitor, comprising:

[0008] Step 1, cutting the formed aluminum foil into aluminum foil sheets of a predetermined shape and welding them on a process bar, and then performing chemical forming in a chemical forming liquid after cleaning to obtain a formed aluminum foil sheet;

[0009] Step 2, coating the surface of the formed aluminum foil with conductive polymer, graphite and silver paste to form an ultra-large capacity laminated aluminum capacitor monomer;

[0010] Step 3, performing stage aging and aging on the ultra-large capacity laminated aluminum capacitor monomer to obtain an aged ultra-large capacity laminated aluminum capacitor monomer;

[0011] Step 4, bonding the aged ultra-large capacity laminated aluminum capacitor monomers with conductive adhesive to form an ultra-large capacity aluminum capacitor core, and encapsulating the ultra-large capacity aluminum capacitor core after the positive and negative electrodes are led out to obtain an ultra-large capacity laminated aluminum capacitor.

[0012] Compared with the prior art, the method for preparing the ultra-large capacity laminated aluminum capacitor provided by the present invention has the following beneficial effects:

[0013] By carrying out specific stage aging on the ultra-large capacity laminated aluminum capacitor monomers, the dielectric film defects in the capacitor monomers can be effectively repaired and the qualified rate of the laminated aluminum capacitor monomers can be improved. After the stage aging, each laminated aluminum capacitor monomer is subjected to specific aging, which can effectively eliminate the aluminum capacitor monomers with defects. After the stage aging and aging, the ultra-large capacity laminated aluminum capacitor monomers effectively improve the qualified rate of the assembled aluminum capacitor core, while reducing the cost and improving the performance and reliability of the aluminum capacitor, and finally preparing the ultra-large capacity laminated aluminum capacitor. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0015] Figure 1 A flow chart of a method for preparing an ultra-large capacity laminated aluminum capacitor provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0016] The following is a clear and complete description of the technical solutions in the embodiments of the present invention in combination with the specific content of the present invention; it is obvious that the described embodiments are only part of the embodiments of the present invention, not all of the embodiments, which does not constitute a limitation of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the protection scope of the present invention.

[0017] First, the terms that may be used in this article are explained as follows:

[0018] The term “and / or” means that either or both of them can be realized at the same time. For example, X and / or Y means both “X” or “Y” and “X and Y”.

[0019] The terms "include", "comprises", "contains", "has" or other descriptions with similar semantics should be interpreted as non-exclusive inclusion. For example, including certain technical feature elements (such as raw materials, components, ingredients, carriers, dosage forms, materials, dimensions, parts, components, mechanisms, devices, steps, procedures, methods, reaction conditions, processing conditions, parameters, algorithms, signals, data, products or products, etc.) should be interpreted as including not only certain technical feature elements explicitly listed, but also other technical feature elements known in the art that are not explicitly listed.

[0020] The term "consisting of..." means excluding any technical feature elements not explicitly listed. If this term is used in a claim, it will make the claim closed, so that it does not contain technical feature elements other than the technical feature elements explicitly listed, except for the conventional impurities related to them. If this term only appears in a clause of a claim, it only limits the elements explicitly listed in the clause, and the elements recorded in other clauses are not excluded from the overall claim.

[0021] Unless otherwise specified or limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example: it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this article can be understood according to specific circumstances.

[0022] When concentration, temperature, pressure, size or other parameters are expressed in the form of a numerical range, the numerical range should be understood to specifically disclose all ranges formed by the pairing of any upper limit, lower limit, and preferred value in the numerical range, regardless of whether the range is explicitly stated; for example, if a numerical range of "2 to 8" is stated, the numerical range should be interpreted as including ranges such as "2 to 7", "2 to 6", "5 to 7", "3 to 4 and 6 to 7", "3 to 5 and 7", "2 and 5 to 7", etc. Unless otherwise specified, the numerical ranges stated herein include both their end values ​​and all integers and fractions within the numerical range.

[0023] The orientation or position relationship indicated by terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", etc. are based on the orientation or position relationship shown in the drawings and are only for the convenience and simplification of description, and do not explicitly or implicitly indicate that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation of this document.

[0024] The scheme provided by the present invention is described in detail below. The contents not described in detail in the embodiments of the present invention belong to the prior art known to professionals in the field. If the specific conditions are not specified in the embodiments of the present invention, they are carried out according to the conventional conditions in the field or the conditions recommended by the manufacturer. If the manufacturers are not specified in the reagents or instruments used in the embodiments of the present invention, they are all conventional products that can be purchased commercially.

[0025] like Figure 1 As shown, an embodiment of the present invention provides a method for preparing an ultra-large capacity laminated aluminum capacitor, comprising:

[0026] Step 1, cutting the formed aluminum foil into aluminum foil sheets of a predetermined shape and welding them on a process bar, and then performing chemical forming in a chemical forming liquid after cleaning to obtain a formed aluminum foil sheet;

[0027] Step 2, coating the surface of the formed aluminum foil with conductive polymer, graphite and silver paste to form an ultra-large capacity laminated aluminum capacitor monomer;

[0028] Step 3, performing stage aging and aging on the ultra-large capacity laminated aluminum capacitor monomer to obtain an aged ultra-large capacity laminated aluminum capacitor monomer;

[0029] Step 4, bonding the aged ultra-large capacity laminated aluminum capacitor monomers with conductive adhesive to form an ultra-large capacity aluminum capacitor core, and encapsulating the ultra-large capacity aluminum capacitor core after the positive and negative electrodes are led out to obtain an ultra-large capacity laminated aluminum capacitor.

[0030] Preferably, in step 3 of the above method, a contact area greater than 1 cm 2 The aging board with contact probe is used to perform stage aging on the super-large capacity multilayer aluminum capacitor monomer.

[0031] Preferably, in step 3 of the above method, the voltages of each stage of stage aging are: 0.15U R ~0.25U R 、0.35U R ~0.45U R 、0.55U R~0.65U R 、0.75U R ~0.85U R ,1.0U R ~1.15U R ;

[0032] The voltage boost rate from each stage of aging to the next stage of aging is 0.1V / min~3V / min;

[0033] The constant pressure time of each stage of aging is 0.5h~6h;

[0034] The aging temperature in each stage is 60℃~125℃;

[0035] Each stage is aged by connecting a current limiting diode or a high resistance resistor of 1kΩ to 10kΩ in series.

[0036] Preferably, in step 3 of the above method, the aging voltage is 1.0U R ~1.15U R .

[0037] Preferably, in step 3 of the above method, no resistor is connected in series during aging, or a low-resistance resistor of 1 to 5Ω is connected in series.

[0038] Preferably, in the above method, the capacity of the ultra-large capacity multilayer aluminum capacitor produced is 3000 μF to 100000 μF.

[0039] Preferably, in step 1 of the above method, cutting the aluminum foil is performed by any one of laser cutting, mechanical cutting, and die stamping;

[0040] The chemical forming liquid is one or more of ammonium adipate, boric acid, ammonium borate, ammonium dihydrogen phosphate, and citric acid.

[0041] The current density of the chemical formation in the chemical formation solution is 0.5~5mA / cm 2 ;

[0042] The formation time is 10 to 45 minutes.

[0043] Preferably, in step 2 of the above method, the conductive high molecular polymer is a polythiophene monomer or a polythiophene dispersion.

[0044] Preferably, in step 4 of the above method, when conductive adhesive is used for bonding, the conductive adhesive is coated by any one of screen printing, roller coating and spraying.

[0045] Preferably, in step 4 of the above method, the positive electrode is led out by connecting the aluminum foil positive electrode to a conductive lead pin or a conductive strip by laser welding or riveting;

[0046] The negative electrode is led out by bonding conductive glue with metal foil or metal tape;

[0047] The packaging methods are epoxy plastic packaging, aluminum plastic film packaging, and metal shell packaging in sequence.

[0048] In summary, it can be seen that the preparation method of the embodiment of the present invention can effectively repair the dielectric film defects existing in the capacitor monomer and improve the qualified rate of the laminated aluminum capacitor monomer by performing specific stage aging on the ultra-large capacity laminated aluminum capacitor monomer. After the stage aging, each laminated aluminum capacitor monomer is subjected to specific aging, which can effectively eliminate the aluminum capacitor monomer with defects. After the stage aging and aging, the ultra-large capacity laminated aluminum capacitor monomer effectively improves the qualified rate of the assembled aluminum capacitor core, while reducing the cost and improving the performance and reliability of the aluminum capacitor, and finally prepares an ultra-large capacity laminated aluminum capacitor.

[0049] In order to more clearly demonstrate the technical solution and technical effects provided by the present invention, the solution provided by the embodiment of the present invention is described in detail with specific embodiments below.

[0050] Example 1

[0051] like Figure 1 As shown, an embodiment of the present invention provides a method for preparing an ultra-large capacity laminated aluminum capacitor, comprising the following steps:

[0052] Step 1, cutting the formed aluminum foil into aluminum foil sheets of a desired predetermined shape and welding them on a process bar, and then performing chemical forming in a forming liquid after cleaning to obtain the formed aluminum foil sheets;

[0053] Step 2, coating the surface of the chemically formed aluminum foil with a conductive polymer, graphite and silver paste to form an ultra-large capacity laminated aluminum capacitor monomer;

[0054] Step 3, performing staged aging and aging on the ultra-large capacity laminated aluminum capacitor monomers. After aging, the ultra-large capacity laminated aluminum capacitor monomers are bonded with conductive adhesive to form an ultra-large capacity laminated aluminum capacitor core. Finally, the positive and negative electrodes of the assembled ultra-large capacity laminated aluminum capacitor core are led out and packaged to obtain an ultra-large capacity laminated aluminum capacitor.

[0055] The capacity of the ultra-large capacity multilayer aluminum capacitor prepared by the above method is 3000μF to 100000μF.

[0056] In the above step 1, the method of cutting the aluminum foil is any one of laser cutting, mechanical cutting, and mold punching.

[0057] In the above step 1, the chemical forming liquid is one or more of ammonium adipate, boric acid, ammonium borate, diammonium dihydrogen phosphate, and citric acid.

[0058] In the above step 1, the current density of the formation is 0.5-5 mA / cm 2 .

[0059] In the above step 1, the formation time is 10 to 45 minutes.

[0060] In the above step 2, the conductive high polymer is a monomer or a dispersion.

[0061] In the above step 3, the capacitor cells are subjected to stage aging using an aging plate with a large-area contact probe.

[0062] In step 3 above, the voltages of the stage aging are: 0.15U R ~0.25U R 、0.35U R ~0.45U R 、0.55U R ~0.65U R 、0.75U R ~0.85U R ,1.0U R ~1.15U R .

[0063] In the above step 3, the voltage increase rate from each stage of aging to the next stage of aging is 0.1V / min to 3V / min.

[0064] In the above step 3, the constant pressure time of each stage of aging is 0.5h to 6h.

[0065] In the above step 3, the aging temperature in each stage is 60°C to 125°C.

[0066] In the above step 3, a current limiting diode or a high resistance resistor of 1kΩ to 10kΩ should be connected in series in each stage of aging.

[0067] In step 3 above, the aging voltage is 1.0U R ~1.15U R .

[0068] In the above step 3, the aging should not be connected in series with a resistor or a low-resistance resistor should be connected in series.

[0069] In the above step 4, the conductive adhesive is coated by any one of screen printing, roller coating and spraying.

[0070] In the above step 4, the positive electrode is led out by connecting the aluminum foil positive electrode to the conductive lead pin or conductive strip by laser welding, riveting or the like.

[0071] In the above step 4, the negative electrode is bonded and led out with a conductive adhesive and a metal foil, a metal tape, etc.

[0072] In the above step 4, the packaging methods include epoxy packaging, aluminum-plastic film packaging, and metal shell packaging.

[0073] The preparation method of the present invention can effectively repair the dielectric film defects existing in the capacitor monomer and improve the qualified rate of the capacitor monomer by performing specific stage aging on the ultra-large capacity laminated aluminum capacitor monomer. After the stage aging, each capacitor monomer is subjected to specific aging, which can effectively eliminate the defective capacitor monomer. After aging and aging, the capacitor monomer can effectively improve the qualified rate of the capacitor core, while reducing the cost and improving the performance and reliability of the capacitor, and finally preparing an ultra-large capacity laminated aluminum capacitor.

[0074] Example 2

[0075] This embodiment provides a method for preparing an ultra-large capacity laminated aluminum capacitor, which is a method for preparing an ultra-large capacity laminated aluminum capacitor with a capacity of 40V and 10000μF, comprising the following steps:

[0076] Step 1: Cut the aluminum foil into 50 mm long and 60 mm wide sheets by laser cutting, and then weld the aluminum foil sheets to the process strips; immerse the aluminum foil sheets in 10% ammonium adipate solution for chemical formation, and the chemical formation current density is 1.0 mA / cm 2 , the forming time is 20min, and a formed aluminum foil is obtained;

[0077] Step 2, immersing the aluminum foil obtained in step 1 into a conductive polymer monomer and an oxidant in turn to polymerize the conductive polymer, and then immersing it in graphite and silver paste to obtain an ultra-large capacity laminated aluminum capacitor monomer;

[0078] Step 3, the ultra-large capacity laminated aluminum capacitor monomer obtained in step 2 is subjected to stage aging at voltages of 8V, 16V, 24V, 32V, and 46V in sequence, with a voltage increase rate of 1V / min, an aging time of 2h in each stage, and an aging temperature of 85°C; the ultra-large capacity laminated aluminum capacitor monomer after stage aging is subjected to aging at an aging voltage of 46V to obtain an ultra-large capacity laminated aluminum capacitor monomer after aging;

[0079] Step 4, coating the conductive adhesive on the aged ultra-large capacity laminated aluminum capacitor monomer obtained in step 3 by spraying, and then assembling the ultra-large capacity aluminum capacitor core, welding the positive electrode of the capacitor to the aluminum strip by laser welding to lead out the positive electrode, bonding the negative electrode to the copper foil by conductive adhesive to lead out the negative electrode, and encapsulating the ultra-large capacity aluminum capacitor core by aluminum-plastic film to obtain the ultra-large capacity laminated aluminum capacitor.

[0080] Example 3

[0081] This embodiment provides a method for preparing an ultra-large capacity laminated aluminum capacitor, which is a method for preparing an ultra-large capacity laminated aluminum capacitor with a capacity of 80V and 15000μF, comprising the following steps:

[0082] Step 1: Cut the aluminum foil into 70mm long and 80mm wide sheets by die stamping, and then weld the aluminum foil sheets to the process strips. Immerse the aluminum foil sheets in 7% ammonium adipate solution for forming, and the forming current density is 1.5mA / cm 2 , the forming time is 15min, and a formed aluminum foil is obtained;

[0083] Step 2, immersing the aluminum foil sheet into a conductive polymer dispersion to coat the sheet with the conductive polymer, and then coating the sheet with graphite and silver paste to obtain a super-large capacity laminated aluminum capacitor monomer;

[0084] Step 3, the cured ultra-large capacity laminated aluminum capacitor monomer is subjected to stage aging, and the voltages of 20V, 36V, 52V, 68V, and 84V are used for aging in sequence, the voltage increase rate is 0.5V / min, the aging time of each stage is 4h, and the aging temperature is 85°C; (5) the ultra-large capacity laminated aluminum capacitor monomer after aging is aged, and the aging voltage is 84V to obtain the ultra-large capacity laminated aluminum capacitor monomer after aging;

[0085] Step 4, using a roller coating method to apply conductive glue on the aged ultra-large capacity laminated aluminum capacitor monomer obtained in step 3, and then assembling the ultra-large capacity aluminum capacitor core, using a laser welding method to weld the positive electrode of the capacitor to the aluminum strip to lead out the positive electrode, and using a conductive glue to bond the negative electrode to the copper strip to lead out the negative electrode, and using an aluminum shell to encapsulate the ultra-large capacity aluminum capacitor core.

[0086] In summary, it can be seen that the preparation method of the embodiment of the present invention performs specific stage aging on the ultra-large capacity multilayer aluminum capacitor when it is still a single capacitor, thereby improving the electrical performance and qualified rate of the capacitor single unit, and at the same time, performs specific aging treatment on the capacitor after aging to eliminate defective capacitor single units, thereby effectively ensuring the qualified rate of the final combined capacitor core, reducing the cost while improving the performance and reliability of the capacitor, and finally preparing an ultra-large capacity multilayer aluminum capacitor.

[0087] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily thought of by any technician familiar with the technical field within the technical scope disclosed in the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims. The information disclosed in the background technology section of this article is only intended to deepen the understanding of the overall background technology of the present invention, and should not be regarded as an admission or in any form that the information constitutes prior art known to those skilled in the art.

Claims

1. A method for preparing an ultra-large capacity laminated aluminum capacitor, characterized in that: include: Step 1, cutting the formed aluminum foil into aluminum foil sheets of a predetermined shape and welding them on a process bar, and then performing chemical forming in a chemical forming liquid after cleaning to obtain a formed aluminum foil sheet; Step 2, coating the surface of the formed aluminum foil with conductive polymer, graphite and silver paste to form an ultra-large capacity laminated aluminum capacitor monomer; Step 3, performing stage aging and aging on the ultra-large capacity laminated aluminum capacitor monomer to obtain an aged ultra-large capacity laminated aluminum capacitor monomer; Step 4, bonding the aged ultra-large capacity laminated aluminum capacitor monomers with conductive adhesive to form an ultra-large capacity aluminum capacitor core, and encapsulating the ultra-large capacity aluminum capacitor core after the positive and negative electrodes are led out to obtain an ultra-large capacity laminated aluminum capacitor.

2. The method for preparing the ultra-large capacity laminated aluminum capacitor according to claim 1, characterized in that: In step 3, a contact area greater than 1 cm 2 The aging board with contact probe is used to perform stage aging on the super-large capacity multilayer aluminum capacitor monomer.

3. The method for preparing the ultra-large capacity laminated aluminum capacitor according to claim 1, characterized in that: In step 3, the voltages of each stage of stage aging are: 0.15U R ~0.25U R 、0.35U R ~0.45U R 、0.55U R ~0.65U R 、0.75U R ~0.85U R ,1.0U R ~1.15U R ; The voltage boost rate from each stage of aging to the next stage of aging is 0.1V / min~3V / min; The constant pressure time of each stage of aging is 0.5h~6h; The aging temperature in each stage is 60℃~125℃; Each stage is aged by connecting a current limiting diode or a high resistance resistor of 1kΩ to 10kΩ in series.

4. The method for preparing the ultra-large capacity laminated aluminum capacitor according to any one of claims 1 to 3, characterized in that: In step 3, the aging voltage is 1.0U R ~1.15U R .

5. The method for preparing the ultra-large capacity laminated aluminum capacitor according to any one of claims 1 to 3, characterized in that: In step 3, during aging, no resistor is connected in series or a low-resistance resistor of 1 to 5Ω is connected in series.

6. The method for preparing the ultra-large capacity laminated aluminum capacitor according to any one of claims 1 to 3, characterized in that: In the method, the capacity of the ultra-large capacity laminated aluminum capacitor prepared is 3000μF to 100000μF.

7. The method for preparing the ultra-large capacity laminated aluminum capacitor according to any one of claims 1 to 3, characterized in that: In the step 1, cutting the aluminum foil is performed by any one of laser cutting, mechanical cutting, and die stamping; The chemical forming liquid is one or more of ammonium adipate, boric acid, ammonium borate, ammonium dihydrogen phosphate, and citric acid. The current density of the chemical formation in the chemical formation solution is 0.5~5mA / cm 2 ; The formation time is 10 to 45 minutes.

8. The method for preparing the ultra-large capacity laminated aluminum capacitor according to any one of claims 1 to 3, characterized in that: In the step 2, the conductive high molecular polymer is a polythiophene monomer or a polythiophene dispersion.

9. The method for preparing a super-large capacity laminated aluminum capacitor according to any one of claims 1 to 3, characterized in that: In step 4, when the conductive adhesive is used for bonding, the conductive adhesive is applied by any one of screen printing, roller coating and spraying.

10. The method for preparing a super-large capacity laminated aluminum capacitor according to any one of claims 1 to 3, characterized in that: In step 4, the positive electrode is led out by connecting the aluminum foil positive electrode to the conductive lead pin or conductive strip by laser welding or riveting; The negative electrode is led out by bonding conductive glue with metal foil or metal tape; The packaging method adopts any one of epoxy plastic packaging, aluminum plastic film packaging, and metal shell packaging.

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