Method for producing solid aluminum electrolytic capacitor with few impurities

Abstract

The invention discloses a method for producing a solid aluminum electrolytic capacitor with few impurities, which comprises the following steps: heating an aluminum material to a molten state, and adding an auxiliary agent for reaction; the molten aluminum is slowly cooled, aluminum crystals are segregated in the growth process, impurity elements are distributed on the surface of aluminum to form a thin layer, the high-purity aluminum crystals are separated from the molten aluminum, the impurity layer on the surface is cut off, and a high-purity aluminum product is obtained; rolling the high-purity aluminum material into an aluminum foil coiled material; the aluminum foil and the prepared electrolytic paper are cut into corresponding appropriate sizes, and the aluminum foil is cut into an anode foil and a cathode foil. According to the production method for producing the solid aluminum electrolytic capacitor with few impurities, the aluminum foil can be pretreated and purified in the production process, impurity components of the aluminum foil are taken out, and the purity of the aluminum foil is improved, so that the impurities of the solid aluminum electrolytic capacitor are reduced, the use effect of the solid aluminum electrolytic capacitor is guaranteed, and the service life is prolonged; the production industry is easy to operate, and the production cost is low.

Description

Technical Field

[0001] The invention relates to the technical field of solid aluminum electrolytic capacitors, and in particular to a method for producing solid aluminum electrolytic capacitors with less impurities. Background Art

[0002] Aluminum electrolytic capacitors are an important electronic component. With the rapid development of the electronics industry, aluminum electrolytic capacitors are more widely used in various electronic devices and have become one of the irreplaceable electronic components. Solid capacitors are a new type of capacitor developed from liquid electrolytic capacitors. Compared with liquid electrolytic capacitors, they have the advantages of high frequency and low impedance, excellent temperature characteristics, and strong ripple resistance. Therefore, solid capacitors have higher use value, but the existing production methods of solid aluminum electrolytic capacitors still have certain defects, such as:

[0003] The application number is CN202011158608.9, “A solid aluminum electrolytic capacitor and its preparation method”. The solid aluminum electrolytic capacitor contains impurities after production. The aluminum foil is not purified during the production process, so that the aluminum foil itself carries impurities, making it impossible to reduce the impurities in the production of solid aluminum electrolytic capacitors, thereby facilitating the use of solid aluminum electrolytic capacitors and affecting their service life.

[0004] In view of this, in-depth research was conducted on the above-mentioned problems, and a method for producing solid aluminum electrolytic capacitors with less impurities was proposed. Summary of the invention

[0005] The purpose of the present invention is to provide a method for producing solid aluminum electrolytic capacitors with less impurities, so as to solve the problem that the existing solid aluminum electrolytic capacitor production method mentioned in the above background technology is not conducive to reducing the impact of impurities on the use effect and life.

[0006] To achieve the above object, the present invention provides the following technical solution: a method for producing a solid aluminum electrolytic capacitor with less impurities, comprising the following steps:

[0007] Step 1: Heat the aluminum material to a molten state and add an additive to react;

[0008] Step 2: The aluminum liquid is slowly cooled to make the aluminum crystals segregate during the growth process, so that the impurity elements are distributed on the surface of the aluminum to form a thin layer, and the high-purity aluminum crystals are separated from the molten aluminum liquid, and the impurity layer on the surface is cut off to obtain high-purity aluminum materials;

[0009] Step 3: rolling high-purity aluminum into aluminum foil coils;

[0010] Step 4: Cut the aluminum foil and the prepared electrolytic paper into appropriate sizes, and cut the aluminum foil into anode foil and cathode foil;

[0011] Step 5: ozone treatment of the aluminum foil to remove impurities and oil stains on the surface of the aluminum foil;

[0012] Step 6: Rivet the positive electrode guide pin and the negative electrode guide pin to the anode foil and the cathode foil respectively, and sandwich the electrolytic paper between the anode foil and the cathode foil, and then wind them into a core package;

[0013] Step 7: Immerse the core in the electrolyte;

[0014] Step 8: Dry the core package;

[0015] Step nine: The dried core package is sealed in a housing to form a solid aluminum electrolytic capacitor.

[0016] As a preferred technical solution of the present invention, the auxiliary agent heated in the step 1 is a master alloy, and the weight ratio of the added amount of aluminum material to the master alloy is 1:0.03-0.10.

[0017] As a preferred technical solution of the present invention, the thickness of the aluminum foil in step three is 0.10-0.12 mm.

[0018] As a preferred technical solution of the present invention, the temperature of the ozone treatment of the aluminum foil in step five is 40-55° C., and the treatment time is 3-8 min.

[0019] As a preferred technical solution of the present invention, in step seven, the core package is immersed in the electrolyte for 15-25 minutes.

[0020] As a preferred technical solution of the present invention, the electrolyte in step seven is an ethanol dispersion of polyaniline.

[0021] As a preferred technical solution of the present invention, the drying temperature in step eight is 160-200° C. and the drying time is 2-4 hours.

[0022] Compared with the prior art, the invention has the following beneficial effects: the method for producing a solid aluminum electrolytic capacitor with less impurities can ensure that the aluminum foil is pre-treated and purified during the production process, and the impurity components of the aluminum foil are removed to improve the purity of the aluminum foil, thereby ensuring that the impurities of the solid aluminum electrolytic capacitor are reduced, ensuring the use effect of the solid aluminum electrolytic capacitor, and improving the service life. At the same time, the production industry is easy to operate and the production cost is low;

[0023] By pretreating the aluminum material, heating and melting the aluminum material and adding the master alloy, it can play the role of deoxidation, desiliconization, and denitrification, effectively reducing the aluminum oxide content, increasing the purity of aluminum, and improving the mechanical properties and corrosion resistance of aluminum. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1This is a data chart of impurity content detection of the solid aluminum electrolytic capacitor prepared by the present invention. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] Embodiment 1

[0027] The technical solution of the present invention is a method for producing a solid aluminum electrolytic capacitor with few impurities, comprising the following steps:

[0028] Step 1: Heat the aluminum material to a molten state and add an additive to react;

[0029] Step 2: The aluminum liquid is slowly cooled to make the aluminum crystals segregate during the growth process, so that the impurity elements are distributed on the surface of the aluminum to form a thin layer, and the high-purity aluminum crystals are separated from the molten aluminum liquid, and the impurity layer on the surface is cut off to obtain high-purity aluminum materials;

[0030] Step 3: rolling high-purity aluminum into aluminum foil coils;

[0031] Step 4: Cut the aluminum foil and the prepared electrolytic paper into appropriate sizes, and cut the aluminum foil into anode foil and cathode foil;

[0032] Step 5: ozone treatment of the aluminum foil to remove impurities and oil stains on the surface of the aluminum foil;

[0033] Step 6: Rivet the positive electrode guide pin and the negative electrode guide pin to the anode foil and the cathode foil respectively, and sandwich the electrolytic paper between the anode foil and the cathode foil, and then wind them into a core package;

[0034] Step 7: Immerse the core in the electrolyte;

[0035] Step 8: Dry the core package;

[0036] Step nine: sealing the dried core package in a housing to form a solid aluminum electrolytic capacitor;

[0037] The auxiliary agent heated in step 1 is a master alloy, and the weight ratio of the added amount of aluminum material to the master alloy is 1:0.03;

[0038] The thickness of the aluminum foil in step 3 is 0.10 mm;

[0039] The temperature of the aluminum foil ozone treatment in step 5 is 40°C and the treatment time is 8 minutes;

[0040] In step 7, the core package is immersed in the electrolyte for 15 minutes;

[0041] The electrolyte in step seven is an ethanol dispersion of polyaniline;

[0042] The drying temperature in step eight is 160° C. and the drying time is 4 h.

[0043] Embodiment 2

[0044] The technical solution of the present invention is a method for producing a solid aluminum electrolytic capacitor with few impurities, comprising the following steps:

[0045] Step 1: Heat the aluminum material to a molten state and add an additive to react;

[0046] Step 2: The aluminum liquid is slowly cooled to make the aluminum crystals segregate during the growth process, so that the impurity elements are distributed on the surface of the aluminum to form a thin layer, and the high-purity aluminum crystals are separated from the molten aluminum liquid, and the impurity layer on the surface is cut off to obtain high-purity aluminum materials;

[0047] Step 3: rolling high-purity aluminum into aluminum foil coils;

[0048] Step 4: Cut the aluminum foil and the prepared electrolytic paper into appropriate sizes, and cut the aluminum foil into anode foil and cathode foil;

[0049] Step 5: ozone treatment of the aluminum foil to remove impurities and oil stains on the surface of the aluminum foil;

[0050] Step 6: Rivet the positive electrode guide pin and the negative electrode guide pin to the anode foil and the cathode foil respectively, and sandwich the electrolytic paper between the anode foil and the cathode foil, and then wind them into a core package;

[0051] Step 7: Immerse the core in the electrolyte;

[0052] Step 8: Dry the core package;

[0053] Step nine: sealing the dried core package in a housing to form a solid aluminum electrolytic capacitor;

[0054] The auxiliary agent heated in step 1 is a master alloy, and the weight ratio of the added amount of aluminum material to the master alloy is 1:0.05;

[0055] The thickness of the aluminum foil in step 3 is 0.10 mm;

[0056] The temperature of the aluminum foil ozone treatment in step 5 is 44°C and the treatment time is 7 minutes;

[0057] In step 7, the core package is immersed in the electrolyte for 18 minutes;

[0058] The electrolyte in step seven is an ethanol dispersion of polyaniline;

[0059] The drying temperature in step eight is 170° C. and the drying time is 4 h.

[0060] Embodiment 3

[0061] The technical solution of the present invention is a method for producing a solid aluminum electrolytic capacitor with few impurities, comprising the following steps:

[0062] Step 1: Heat the aluminum material to a molten state and add an additive to react;

[0063] Step 2: The aluminum liquid is slowly cooled to make the aluminum crystals segregate during the growth process, so that the impurity elements are distributed on the surface of the aluminum to form a thin layer, and the high-purity aluminum crystals are separated from the molten aluminum liquid, and the impurity layer on the surface is cut off to obtain high-purity aluminum materials;

[0064] Step 3: rolling high-purity aluminum into aluminum foil coils;

[0065] Step 4: Cut the aluminum foil and the prepared electrolytic paper into appropriate sizes, and cut the aluminum foil into anode foil and cathode foil;

[0066] Step 5: ozone treatment of the aluminum foil to remove impurities and oil stains on the surface of the aluminum foil;

[0067] Step 6: Rivet the positive electrode guide pin and the negative electrode guide pin to the anode foil and the cathode foil respectively, and sandwich the electrolytic paper between the anode foil and the cathode foil, and then wind them into a core package;

[0068] Step 7: Immerse the core in the electrolyte;

[0069] Step 8: Dry the core package;

[0070] Step nine: sealing the dried core package in a housing to form a solid aluminum electrolytic capacitor;

[0071] The auxiliary agent heated in step 1 is a master alloy, and the weight ratio of the added amount of aluminum material to the master alloy is 1:0.06;

[0072] The thickness of the aluminum foil in step 3 is 0.11 mm;

[0073] The temperature of the aluminum foil ozone treatment in step 5 is 46°C and the treatment time is 6 minutes;

[0074] In step 7, the core package is immersed in the electrolyte for 20 minutes;

[0075] The electrolyte in step seven is an ethanol dispersion of polyaniline;

[0076] The drying temperature in step eight is 180° C. and the drying time is 3 h.

[0077] Embodiment 4

[0078] The technical solution of the present invention is a method for producing a solid aluminum electrolytic capacitor with few impurities, comprising the following steps:

[0079] Step 1: Heat the aluminum material to a molten state and add an additive to react;

[0080] Step 2: The aluminum liquid is slowly cooled to make the aluminum crystals segregate during the growth process, so that the impurity elements are distributed on the surface of the aluminum to form a thin layer, and the high-purity aluminum crystals are separated from the molten aluminum liquid, and the impurity layer on the surface is cut off to obtain high-purity aluminum materials;

[0081] Step 3: rolling high-purity aluminum into aluminum foil coils;

[0082] Step 4: Cut the aluminum foil and the prepared electrolytic paper into appropriate sizes, and cut the aluminum foil into anode foil and cathode foil;

[0083] Step 5: ozone treatment of the aluminum foil to remove impurities and oil stains on the surface of the aluminum foil;

[0084] Step 6: Rivet the positive electrode guide pin and the negative electrode guide pin to the anode foil and the cathode foil respectively, and sandwich the electrolytic paper between the anode foil and the cathode foil, and then wind them into a core package;

[0085] Step 7: Immerse the core in the electrolyte;

[0086] Step 8: Dry the core package;

[0087] Step nine: sealing the dried core package in a housing to form a solid aluminum electrolytic capacitor;

[0088] The auxiliary agent heated in step 1 is a master alloy, and the weight ratio of the added amount of aluminum material to the master alloy is 1:0.07;

[0089] The thickness of the aluminum foil in step 3 is 0.11 mm;

[0090] The temperature of the aluminum foil ozone treatment in step 5 is 50°C and the treatment time is 6 minutes;

[0091] In step 7, the core package is immersed in the electrolyte for 22 minutes;

[0092] The electrolyte in step seven is an ethanol dispersion of polyaniline;

[0093] The drying temperature in step eight is 180° C. and the drying time is 3 h.

[0094] Embodiment 5

[0095] The technical solution of the present invention is a method for producing a solid aluminum electrolytic capacitor with few impurities, comprising the following steps:

[0096] Step 1: Heat the aluminum material to a molten state and add an additive to react;

[0097] Step 2: The aluminum liquid is slowly cooled to make the aluminum crystals segregate during the growth process, so that the impurity elements are distributed on the surface of the aluminum to form a thin layer, and the high-purity aluminum crystals are separated from the molten aluminum liquid, and the impurity layer on the surface is cut off to obtain high-purity aluminum materials;

[0098] Step 3: rolling high-purity aluminum into aluminum foil coils;

[0099] Step 4: Cut the aluminum foil and the prepared electrolytic paper into appropriate sizes, and cut the aluminum foil into anode foil and cathode foil;

[0100] Step 5: ozone treatment of the aluminum foil to remove impurities and oil stains on the surface of the aluminum foil;

[0101] Step 6: Rivet the positive electrode guide pin and the negative electrode guide pin to the anode foil and the cathode foil respectively, and sandwich the electrolytic paper between the anode foil and the cathode foil, and then wind them into a core package;

[0102] Step 7: Immerse the core in the electrolyte;

[0103] Step 8: Dry the core package;

[0104] Step nine: sealing the dried core package in a housing to form a solid aluminum electrolytic capacitor;

[0105] The auxiliary agent heated in step 1 is a master alloy, and the weight ratio of the added amount of aluminum material to the master alloy is 1:0.08;

[0106] The thickness of the aluminum foil in step 3 is 0.12 mm;

[0107] The temperature of the aluminum foil ozone treatment in step 5 is 52°C and the treatment time is 5 minutes;

[0108] In step 7, the core package is immersed in the electrolyte for 22 minutes;

[0109] The electrolyte in step seven is an ethanol dispersion of polyaniline;

[0110] The drying temperature in step eight is 190° C. and the drying time is 2.5 h.

[0111] Embodiment 6

[0112] The technical solution of the present invention is a method for producing a solid aluminum electrolytic capacitor with few impurities, comprising the following steps:

[0113] Step 1: Heat the aluminum material to a molten state and add an additive to react;

[0114] Step 2: The aluminum liquid is slowly cooled to make the aluminum crystals segregate during the growth process, so that the impurity elements are distributed on the surface of the aluminum to form a thin layer, and the high-purity aluminum crystals are separated from the molten aluminum liquid, and the impurity layer on the surface is cut off to obtain high-purity aluminum materials;

[0115] Step 3: rolling high-purity aluminum into aluminum foil coils;

[0116] Step 4: Cut the aluminum foil and the prepared electrolytic paper into appropriate sizes, and cut the aluminum foil into anode foil and cathode foil;

[0117] Step 5: ozone treatment of the aluminum foil to remove impurities and oil stains on the surface of the aluminum foil;

[0118] Step 6: Rivet the positive electrode guide pin and the negative electrode guide pin to the anode foil and the cathode foil respectively, and sandwich the electrolytic paper between the anode foil and the cathode foil, and then wind them into a core package;

[0119] Step 7: Immerse the core in the electrolyte;

[0120] Step 8: Dry the core package;

[0121] Step nine: sealing the dried core package in a housing to form a solid aluminum electrolytic capacitor;

[0122] The auxiliary agent heated in step 1 is a master alloy, and the weight ratio of the added amount of aluminum material to the master alloy is 1:0.10;

[0123] The thickness of the aluminum foil in step 3 is 0.12 mm;

[0124] The temperature of the aluminum foil ozone treatment in step 5 is 55°C and the treatment time is 3 minutes;

[0125] In step 7, the core package is immersed in the electrolyte for 25 minutes;

[0126] The electrolyte in step seven is an ethanol dispersion of polyaniline;

[0127] The drying temperature in step eight is 200° C. and the drying time is 2 h.

[0128] Impurity detection

[0129] The impurity content of the solid aluminum electrolytic capacitor prepared by the solid aluminum electrolytic capacitor and the preparation method thereof in the above embodiment and the application number CN202011158608.9 was tested, and the test results are as follows: Figure 1 As shown;

[0130] It can be seen from the test results in the figure that the impurity content of the solid aluminum electrolytic capacitor prepared by the present invention is clearly less. At the same time, it can be seen from Examples 1 to 6 that with the increase in the proportion of the mother alloy, the impurities of the prepared solid aluminum electrolytic capacitor are gradually reduced. The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

[0131] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A method for producing a solid aluminum electrolytic capacitor with few impurities, characterized in that: The following steps are involved: Step 1: Heat the aluminum material to a molten state and add an additive to react; Step 2: The aluminum liquid is slowly cooled to make the aluminum crystals segregate during the growth process, so that the impurity elements are distributed on the surface of the aluminum to form a thin layer, and the high-purity aluminum crystals are separated from the molten aluminum liquid, and the impurity layer on the surface is cut off to obtain high-purity aluminum materials; Step 3: rolling high-purity aluminum into aluminum foil coils; Step 4: Cut the aluminum foil and the prepared electrolytic paper into appropriate sizes, and cut the aluminum foil into anode foil and cathode foil; Step 5: ozone treatment of the aluminum foil to remove impurities and oil stains on the surface of the aluminum foil; Step 6: Rivet the positive electrode guide pin and the negative electrode guide pin to the anode foil and the cathode foil respectively, and sandwich the electrolytic paper between the anode foil and the cathode foil, and then wind them into a core package; Step 7: Immerse the core in the electrolyte; Step 8: Dry the core package; Step nine: The dried core package is sealed in a housing to form a solid aluminum electrolytic capacitor.

2. The method for producing a solid aluminum electrolytic capacitor with few impurities according to claim 1, characterized in that: The auxiliary agent heated in the step 1 is a master alloy, and the weight ratio of the added amount of aluminum material to the master alloy is 1:0.03-0.

10.

3. The method for producing a solid aluminum electrolytic capacitor with few impurities according to claim 1, characterized in that: The thickness of the aluminum foil in step three is 0.10-0.12 mm.

4. The method for producing a solid aluminum electrolytic capacitor with few impurities according to claim 1, characterized in that: In step 5, the temperature of the aluminum foil ozone treatment is 40-55° C., and the treatment time is 3-8 minutes.

5. The method for producing a solid aluminum electrolytic capacitor with few impurities according to claim 1, characterized in that: In step seven, the core package is immersed in the electrolyte for 15-25 minutes.

6. The method for producing a solid aluminum electrolytic capacitor with few impurities according to claim 1, characterized in that: The electrolyte in step seven is an ethanol dispersion of polyaniline.

7. The method for producing a solid aluminum electrolytic capacitor with few impurities according to claim 1, characterized in that: The drying temperature in step eight is 160-200° C. and the drying time is 2-4 hours.

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