Core of aluminum electrolytic capacitor and aluminum electrolytic capacitor comprising same

Abstract

The invention relates to a core of an aluminum electrolytic capacitor and the aluminum electrolytic capacitor comprising the core, and relates to the technical field of capacitors. The core of the aluminum electrolytic capacitor is composed of an assembly comprising a positive electrode foil, a negative electrode foil, electrolytic paper and a foil guide strip, the positive electrode foil is an aluminum foil with the purity of 99.99% or above, and the negative electrode foil is an aluminum foil with the purity of 99.5% or above. The aluminum electrolytic capacitor provided by the invention comprises the core provided by the invention. The aluminum electrolytic capacitor disclosed by the invention not only can stably work under a rated working voltage for a long time, but also can continuously and stably work under an overvoltage working condition within a short time, and has a good industrial application prospect.

Description

Technical Field

[0001] The present invention relates to the technical field of capacitors, in particular to a core of an aluminum electrolytic capacitor and an aluminum electrolytic capacitor comprising the core. Background Art

[0002] The voltage (the sum of the DC voltage and the ripple voltage peak) loaded for a long time during actual use of aluminum electrolytic capacitors cannot exceed their rated working voltage. If the aluminum electrolytic capacitor is used in a process that exceeds its rated working voltage, it is easy for the aluminum electrolytic capacitor to fail, such as breakdown, heating and bottom bulging. With the rapid development of the new energy field, the capacitors used in photovoltaic inverters have increased dramatically. During the operation of the photovoltaic inverter system, the bus voltage varies due to different working conditions. Although the bus voltage will exceed the rated working voltage of the capacitor only very rarely, ordinary aluminum electrolytic capacitors are very likely to fail when working at a voltage exceeding the rated working voltage. The key to the withstand voltage of aluminum electrolytic capacitors lies in the withstand voltage performance of their cores. The core is generally composed of positive foil, negative foil, electrolytic paper, electrolyte adsorbed on the electrolytic paper, and foil strips.

[0003] The prior art also discloses some technical solutions for improving the positive electrode foil, negative electrode foil, and electrolyte to improve the voltage resistance performance of aluminum electrolytic capacitors. For example, patent application CN106783178A discloses a low temperature and high pressure resistant aluminum electrolytic capacitor working electrolyte and a preparation method thereof, and patent CN221884916U discloses an aluminum electrolytic capacitor core and an aluminum electrolytic capacitor.

[0004] However, there is still a great demand in the market for aluminum electrolytic capacitors that can work stably at the rated working voltage for a long time and can continue to work stably under overvoltage conditions for a short time. It is also necessary to provide more aluminum electrolytic capacitors and their cores that can meet market demand. Summary of the invention

[0005] The purpose of the present invention is to provide a core of an aluminum electrolytic capacitor and an aluminum electrolytic capacitor including the core. The aluminum electrolytic capacitor of the present invention can not only work stably at a rated working voltage for a long time, but also work continuously and stably under an overvoltage condition for a short time, and has good industrial application prospects.

[0006] The above objects of the present invention are achieved through the following technical solutions:

[0007] In a first aspect, the present invention provides a core of an aluminum electrolytic capacitor, the core comprising a positive electrode foil, a negative electrode foil, electrolytic paper, and a foil guide strip, wherein the positive electrode foil is selected from aluminum foil with a purity of more than 99.99%, and the negative electrode foil is selected from aluminum foil with a purity of more than 99.5%.

[0008] In some embodiments of the present invention, the positive electrode foil is made of aluminum foil with a purity of 99.99%.

[0009] In some embodiments of the present invention, the surface of the positive electrode foil is formed into an aluminum oxide film.

[0010] In some embodiments of the present invention, the crystalline structure of the aluminum oxide film formed on the surface of the positive electrode foil is mainly γ-Al 2 O 3 Crystal.

[0011] In some embodiments of the present invention, the negative electrode foil is made of aluminum foil with a purity of 99.8%.

[0012] In some embodiments of the present invention, the negative electrode foil has a formation voltage of 2-7V.

[0013] In some embodiments of the present invention, the electrolytic paper is used to separate the positive electrode foil and the negative electrode foil, and the separated positive electrode foil and the negative electrode foil are overlapped and wound to form a core.

[0014] In some embodiments of the present invention, the electrolytic paper of the core includes a first electrolytic paper and a second electrolytic paper, and the first electrolytic paper and the second electrolytic paper are the same or different.

[0015] In some embodiments of the present invention, the selection indexes of the electrolytic paper are ESR and withstand voltage.

[0016] In some embodiments of the present invention, the first electrolytic paper and the second electrolytic paper of the core of the aluminum electrolytic capacitor with a voltage of ≥500V meet the standards of ESR≤2.80 and withstand voltage ≥950V after being used together.

[0017] For example, in the electrolytic paper matching schemes in Table 1 below, only two electrolytic papers in the matching schemes numbered 1 to 5 can be used as electrolytic papers for aluminum electrolytic capacitors with a voltage of ≥500V.

[0018] Table 1 Electrolytic paper matching scheme

[0019]

[0020]

[0021] In some embodiments of the present invention, the first electrolytic paper and the second electrolytic paper of the core of the aluminum electrolytic capacitor with a voltage of less than 500V meet the standards of ESR≤2.95 and withstand voltage≥930V after being used together.

[0022] For example, in the electrolytic paper matching schemes in Table 2 below, only two electrolytic papers in the matching schemes numbered 11 to 14 can be used as electrolytic papers for aluminum electrolytic capacitors with a voltage of less than 500V.

[0023] Table 2 Electrolytic paper matching scheme

[0024] serial number Electrolytic paper matching solution ESR Withstand voltage(V) 11 Electrolytic paper M+Electrolytic paper M 2.20 940 12 Electrolytic paper M+Electrolytic paper N 2.81 1120 13 Electrolytic paper A+Electrolytic paper J 2.95 930 14 Electrolytic paper B + Electrolytic paper J 2.80 930 15 Electrolytic paper D + Electrolytic paper J 2.78 910 16 Electrolytic paper E+Electrolytic paper J 2.88 910 17 Electrolytic paper K+Electrolytic paper K 3.84 920 18 Electrolytic paper F+Electrolytic paper L 3.16 1020 19 Electrolytic paper H+Electrolytic paper J 3.55 1030

[0025] In some embodiments of the present invention, when the first electrolytic paper and the second electrolytic paper have different densities, the electrolytic paper with lower density is in close contact with the positive electrode foil.

[0026] In some embodiments of the present invention, an electrolyte is adsorbed on the electrolytic paper, and the components of the electrolyte include ethylene glycol, glycerol, mannitol, polyethylene glycol 4000, a high viscosity additive, boric acid, a polymeric carboxylic acid ammonium salt, 8,13-dimethyl-8,12-diene-eicosapentadicarboxylic acid ammonium, butyl phosphate, silica sol ethylene glycol, and o-nitroacetophenone.

[0027] In some embodiments of the present invention, the high viscosity additive is selected from at least one of modified polyvinyl alcohols; preferably at least one of polyvinyl alcohol polymers having an amide structure.

[0028] In some embodiments of the present invention, the modified polyvinyl alcohol may be a commercially available product, such as a polyvinyl alcohol polymer having an amide structure produced by Shenzhen Xinzhoubang Technology Co., Ltd. or Wuhan Haisi Spring Technology Development Co., Ltd.

[0029] In some embodiments of the present invention, the electrolyte comprises the following components in parts by weight:

[0030]

[0031] In some embodiments of the present invention, the electrolyte is composed of the following components in parts by weight based on 100 parts by weight:

[0032]

[0033] In some embodiments of the present invention, the electrolyte comprises the following components in parts by weight:

[0034]

[0035] In some embodiments of the present invention, the electrolyte is produced by a method comprising the following steps:

[0036] (1) adding ethylene glycol and glycerol into a reactor and heating the reactor to 130-150° C., then adding mannitol, polyethylene glycol 4000, a high viscosity additive, and boric acid into the reactor, and keeping the temperature at 130-150° C. for 45-75 minutes;

[0037] (2) After the reaction in step (1) is completed, the reaction solution is cooled to 100-120° C., and then the polymerized carboxylic acid ammonium salt and 8,13-dimethyl-8,12-diene-eicosaldicarboxylammonium are added to the reactor, and the mixture is kept at 100-120° C. for 45-75 minutes;

[0038] (3) After the reaction in step (2) is completed, the reaction solution is cooled to 80-95° C., and then butyl phosphate, silica sol ethylene glycol and o-nitroacetophenone are added to the reactor, and the mixture is kept at 80-95° C. for 20-40 minutes.

[0039] In some embodiments of the present invention, the electrolyte is produced by a method comprising the following steps:

[0040] (1) adding ethylene glycol and glycerol into a reactor and heating the reactor to 135-145° C., then adding mannitol, polyethylene glycol 4000, a high viscosity additive, and boric acid into the reactor, and keeping the temperature at 135-145° C. for 50-70 minutes;

[0041] (2) After the reaction in step (1) is completed, the reaction solution is cooled to 105-115° C., and then the polymerized carboxylic acid ammonium salt and 8,13-dimethyl-8,12-diene-eicosaldicarboxylammonium are added to the reactor, and the mixture is kept at 105-115° C. for 50-70 minutes;

[0042] (3) After the reaction in step (2) is completed, the reaction solution is cooled to 85-95° C., and then butyl phosphate, silica sol ethylene glycol and o-nitroacetophenone are added to the reactor, and the mixture is kept at 85-95° C. for 25-35 minutes.

[0043] In some embodiments of the present invention, the electrolyte is produced by a method comprising the following steps:

[0044] (1) adding ethylene glycol and glycerol into a reactor and heating the reactor to 140° C., then adding mannitol, polyethylene glycol 4000, a high viscosity additive, and boric acid into the reactor, and keeping the temperature at 140° C. for 60 minutes;

[0045] (2) After the reaction in step (1) is completed, the reaction solution is cooled to 110° C., and then the polymerized carboxylic acid ammonium salt and 8,13-dimethyl-8,12-diene-eicosaldicarboxylammonium are added to the reactor, and the mixture is kept at 110° C. for 60 minutes;

[0046] (3) After the reaction in step (2) is completed, the reaction solution is cooled to 90° C., and then butyl phosphate, silica sol ethylene glycol and o-nitroacetophenone are added to the reactor, and the mixture is kept at 90° C. for 30 min.

[0047] In a second aspect, the present invention provides an aluminum electrolytic capacitor, wherein the aluminum electrolytic capacitor comprises the core described in the first aspect.

[0048] In some embodiments of the present invention, the aluminum electrolytic capacitor further includes a cover plate, a sleeve, an aluminum shell, and an insulating film.

[0049] In some embodiments of the present invention, the aluminum electrolytic capacitor further includes a lead terminal and an electronic tape.

[0050] In some embodiments of the present invention, the aluminum electrolytic capacitor can operate for more than 5000 hours at a rated upper limit temperature (105° C.) and a rated operating voltage.

[0051] In some embodiments of the present invention, the aluminum electrolytic capacitor can operate for more than 1000 hours at an ambient temperature of 85° C. and a voltage exceeding the rated operating voltage by 25 to 50 V.

[0052] Compared with the prior art, the advantages of the present invention are:

[0053] 1. The positive electrode foil and the negative electrode foil of the core of the aluminum electrolytic capacitor of the present invention are both made of high-purity aluminum foil. The high-purity aluminum foil has a low impurity content and can remain stable during long-term use, thereby effectively reducing the capacitance attenuation rate and leakage current of the aluminum electrolytic capacitor after long-term operation.

[0054] 2. The surface of the positive electrode foil of the core of the aluminum electrolytic capacitor of the present invention is formed into an aluminum oxide film, which constitutes the insulating dielectric material of the aluminum electrolytic capacitor, which is beneficial to reduce the temperature rise of the aluminum electrolytic capacitor and enhance the ripple resistance of the aluminum electrolytic capacitor; especially when the oxide film is γ-Al 2 O 3 When the crystalline structure is dominant, the oxide film has a denser structure and better insulation properties.

[0055] 3. The core of the aluminum electrolytic capacitor of the present invention uses a negative electrode foil with a formation voltage of 2 to 7V, which can effectively avoid the phenomenon that the specific capacitance of the negative electrode foil is greatly attenuated due to partial reverse voltage applied to the aluminum electrolytic capacitor at the moment of switching on and off during use.

[0056] 4. The core of the aluminum electrolytic capacitor of the present invention selects the electrolytic paper including the first electrolytic paper and the second electrolytic paper based on ESR and withstand voltage value, which can reduce ESR while ensuring that the aluminum electrolytic capacitor has a higher withstand voltage value.

[0057] 5. The electrolyte of the core of the aluminum electrolytic capacitor of the present invention has a relatively high flash voltage, which can ensure that the aluminum electrolytic capacitor works stably under overvoltage conditions.

[0058] 6. The aluminum electrolytic capacitor of the present invention includes the core of the present invention, which can meet the requirements of working for more than 5000 hours at the rated upper limit temperature (105°C) and the rated working voltage, and can also work for more than 1000 hours at an ambient temperature of 85°C and a voltage exceeding the rated working voltage by 25 to 50V. BRIEF DESCRIPTION OF THE DRAWINGS

[0059] Figure 1 FIG. 1 is an expanded view of a core of an aluminum electrolytic capacitor according to an example of the present invention.

[0060] Figure 2 FIG. 1 is a product structure diagram of an example aluminum electrolytic capacitor of the present invention. DETAILED DESCRIPTION

[0061] The technology of the present invention is further illustrated by examples below. These examples are explanations and examples of the present invention and do not limit the scope of the present invention in any form.

[0062] Example 1

[0063] A core for an aluminum electrolytic capacitor with a specification of 550V470μF, the core is composed of a component including a positive foil, a negative foil, a foil guide strip and electrolytic paper for isolating the positive foil and the negative foil; its development diagram is as follows Figure 1 shown.

[0064] The positive electrode foil is made of aluminum foil with a purity of 99.99%, and the surface of the positive electrode foil is formed into an aluminum oxide film.

[0065] The negative electrode foil is made of aluminum foil with a purity of 99.8%, and the negative electrode foil has a formation voltage of 2 to 7V.

[0066] The electrolytic paper of the core is a combination of a first electrolytic paper and a second electrolytic paper, wherein after the first electrolytic paper and the second electrolytic paper are used together, ESR=2.65 and withstand voltage value=1000V.

[0067] The electrolytic paper is adsorbed with an electrolyte, which specifically comprises the following components in parts by weight:

[0068]

[0069] The high viscosity additive is polyvinyl alcohol with an amide structure, and the manufacturer is Shenzhen Xinzhoubang Technology Co., Ltd.

[0070] The electrolyte is produced by a method comprising the following steps:

[0071] (1) adding ethylene glycol and glycerol into a reactor and heating the reactor to 140° C., then adding mannitol, polyethylene glycol 4000, a high viscosity additive, and boric acid into the reactor, and keeping the temperature at 140° C. for 60 minutes;

[0072] (2) After the reaction in step (1) is completed, the reaction solution is cooled to 110° C., and then the polymerized carboxylic acid ammonium salt and 8,13-dimethyl-8,12-diene-eicosaldicarboxylammonium are added to the reactor, and the mixture is kept at 110° C. for 60 minutes;

[0073] (3) After the reaction in step (2) is completed, the reaction solution is cooled to 90° C., and then butyl phosphate, silica sol ethylene glycol and o-nitroacetophenone are added to the reactor, and the mixture is kept at 90° C. for 30 min.

[0074] Example 2

[0075] A core for an aluminum electrolytic capacitor with a specification of 550V 470μF, the core is composed of a component including a positive electrode foil, a negative electrode foil, a foil guide strip and electrolytic paper for isolating the positive electrode foil and the negative electrode foil.

[0076] The positive electrode foil is made of aluminum foil with a purity of 99.99%, and the surface of the positive electrode foil is formed into an aluminum oxide film.

[0077] The negative electrode foil is made of aluminum foil with a purity of 99.8%, and the negative electrode foil has a formation voltage of 2 to 7V.

[0078] The electrolytic paper of the core is a combination of a first electrolytic paper and a second electrolytic paper. After the first electrolytic paper and the second electrolytic paper are used together, ESR=2.73 and withstand voltage value=1020V.

[0079] The electrolytic paper is adsorbed with an electrolyte, which specifically comprises the following components in parts by weight:

[0080]

[0081] The high viscosity additive is polyvinyl alcohol with an amide structure, and the manufacturer is Wuhan Haisi Spring Technology Development Co., Ltd.

[0082] The electrolyte is produced by a method comprising the following steps:

[0083] (1) adding ethylene glycol and glycerol into a reactor and heating the reactor to 140° C., then adding mannitol, polyethylene glycol 4000, a high viscosity additive, and boric acid into the reactor, and keeping the temperature at 140° C. for 60 minutes;

[0084] (2) After the reaction in step (1) is completed, the reaction solution is cooled to 110° C., and then the polymerized carboxylic acid ammonium salt and 8,13-dimethyl-8,12-diene-eicosaldicarboxylammonium are added to the reactor, and the mixture is kept at 110° C. for 60 minutes;

[0085] (3) After the reaction in step (2) is completed, the reaction solution is cooled to 90° C., and then butyl phosphate, silica sol ethylene glycol and o-nitroacetophenone are added to the reactor, and the mixture is kept at 90° C. for 30 min.

[0086] Example 3

[0087] A core for an aluminum electrolytic capacitor with a specification of 550V 470μF, the core is composed of a component including a positive electrode foil, a negative electrode foil, a foil guide strip and electrolytic paper for isolating the positive electrode foil and the negative electrode foil.

[0088] The positive electrode foil is made of aluminum foil with a purity of 99.99%, and the surface of the positive electrode foil is formed into an aluminum oxide film.

[0089] The negative electrode foil is made of aluminum foil with a purity of 99.8%, and the negative electrode foil has a formation voltage of 2 to 7V.

[0090] The electrolytic paper of the core is a combination of a first electrolytic paper and a second electrolytic paper. After the first electrolytic paper and the second electrolytic paper are used together, ESR=2.63 and withstand voltage=970V.

[0091] The electrolytic paper is adsorbed with an electrolyte, which specifically comprises the following components in parts by weight:

[0092]

[0093] The high viscosity additive is polyvinyl alcohol with an amide structure, and the manufacturer is Shenzhen Xinzhoubang Technology Co., Ltd.

[0094] The electrolyte is produced by a method comprising the following steps:

[0095] (1) adding ethylene glycol and glycerol into a reactor and heating the reactor to 140° C., then adding mannitol, polyethylene glycol 4000, a high viscosity additive, and boric acid into the reactor, and keeping the temperature at 140° C. for 60 minutes;

[0096] (2) After the reaction in step (1) is completed, the reaction solution is cooled to 110° C., and then the polymerized carboxylic acid ammonium salt and 8,13-dimethyl-8,12-diene-eicosaldicarboxylammonium are added to the reactor, and the mixture is kept at 110° C. for 60 minutes;

[0097] (3) After the reaction in step (2) is completed, the reaction solution is cooled to 90° C., and then butyl phosphate, silica sol ethylene glycol and o-nitroacetophenone are added to the reactor, and the mixture is kept at 90° C. for 30 min.

[0098] Example 4

[0099] A core for an aluminum electrolytic capacitor with a specification of 550V 470μF, the core is composed of a component including a positive electrode foil, a negative electrode foil, a foil guide strip and electrolytic paper for isolating the positive electrode foil and the negative electrode foil.

[0100] The positive electrode foil is made of aluminum foil with a purity of 99.99%, and the surface of the positive electrode foil is formed into an aluminum oxide film.

[0101] The negative electrode foil is made of aluminum foil with a purity of 99.8%, and the negative electrode foil has a formation voltage of 2 to 7V.

[0102] The electrolytic paper of the core is a combination of a first electrolytic paper and a second electrolytic paper, wherein after the first electrolytic paper and the second electrolytic paper are used together, ESR=2.73 and withstand voltage value=980V.

[0103] The electrolytic paper is adsorbed with an electrolyte, which specifically comprises the following components in parts by weight:

[0104]

[0105] The high viscosity additive is polyvinyl alcohol with an amide structure, and the manufacturer is Shenzhen Xinzhoubang Technology Co., Ltd.

[0106] The electrolyte is produced by a method comprising the following steps:

[0107] (1) adding ethylene glycol and glycerol into a reactor and heating the reactor to 140° C., then adding mannitol, polyethylene glycol 4000, a high viscosity additive, and boric acid into the reactor, and keeping the temperature at 140° C. for 60 minutes;

[0108] (2) After the reaction in step (1) is completed, the reaction solution is cooled to 110° C., and then the polymerized carboxylic acid ammonium salt and 8,13-dimethyl-8,12-diene-eicosaldicarboxylammonium are added to the reactor, and the mixture is kept at 110° C. for 60 minutes;

[0109] (3) After the reaction in step (2) is completed, the reaction solution is cooled to 90° C., and then butyl phosphate, silica sol ethylene glycol and o-nitroacetophenone are added to the reactor, and the mixture is kept at 90° C. for 30 min.

[0110] Example 5

[0111] A core for an aluminum electrolytic capacitor with a specification of 550V 470μF, the core is composed of a component including a positive electrode foil, a negative electrode foil, a foil guide strip and electrolytic paper for isolating the positive electrode foil and the negative electrode foil.

[0112] The positive electrode foil is made of aluminum foil with a purity of 99.99%, and the surface of the positive electrode foil is formed into an aluminum oxide film.

[0113] The negative electrode foil is made of aluminum foil with a purity of 99.8%, and the negative electrode foil has a formation voltage of 2 to 7V.

[0114] The electrolytic paper of the core is a combination of a first electrolytic paper and a second electrolytic paper, wherein after the first electrolytic paper and the second electrolytic paper are used together, ESR=2.80 and withstand voltage value=1000V.

[0115] The electrolytic paper is adsorbed with an electrolyte, which specifically comprises the following components in parts by weight:

[0116]

[0117] The high viscosity additive is polyvinyl alcohol with an amide structure, and the manufacturer is Shenzhen Xinzhoubang Technology Co., Ltd.

[0118] The electrolyte is produced by a method comprising the following steps:

[0119] (1) adding ethylene glycol and glycerol into a reactor and heating the reactor to 140° C., then adding mannitol, polyethylene glycol 4000, a high viscosity additive, and boric acid into the reactor, and keeping the temperature at 140° C. for 60 minutes;

[0120] (2) After the reaction in step (1) is completed, the reaction solution is cooled to 110° C., and then the polymerized carboxylic acid ammonium salt and 8,13-dimethyl-8,12-diene-eicosaldicarboxylammonium are added to the reactor, and the mixture is kept at 110° C. for 60 minutes;

[0121] (3) After the reaction in step (2) is completed, the reaction solution is cooled to 90° C., and then butyl phosphate, silica sol ethylene glycol and o-nitroacetophenone are added to the reactor, and the mixture is kept at 90° C. for 30 min.

[0122] Example 6

[0123] A core for an aluminum electrolytic capacitor with a specification of 525V 470μF, the core comprising a positive electrode foil, a negative electrode foil, a foil guide strip and an electrolytic paper for isolating the positive electrode foil and the negative electrode foil.

[0124] The positive electrode foil is made of aluminum foil with a purity of 99.99%, and the surface of the positive electrode foil is formed into an aluminum oxide film.

[0125] The negative electrode foil is made of aluminum foil with a purity of 99.8%, and the negative electrode foil has a formation voltage of 2 to 7V.

[0126] The electrolytic paper of the core is a combination of a first electrolytic paper and a second electrolytic paper, wherein after the first electrolytic paper and the second electrolytic paper are used together, ESR=2.65 and withstand voltage value=1000V.

[0127] The electrolytic paper is adsorbed with an electrolyte, which specifically comprises the following components in parts by weight:

[0128]

[0129] The high viscosity additive is polyvinyl alcohol with an amide structure, and the manufacturer is Shenzhen Xinzhoubang Technology Co., Ltd.

[0130] The electrolyte is produced by a method comprising the following steps:

[0131] (1) adding ethylene glycol and glycerol into a reactor and heating the reactor to 140° C., then adding mannitol, polyethylene glycol 4000, a high viscosity additive, and boric acid into the reactor, and keeping the temperature at 140° C. for 60 minutes;

[0132] (2) After the reaction in step (1) is completed, the reaction solution is cooled to 110° C., and then the polymerized carboxylic acid ammonium salt and 8,13-dimethyl-8,12-diene-eicosaldicarboxylammonium are added to the reactor, and the mixture is kept at 110° C. for 60 minutes;

[0133] (3) After the reaction in step (2) is completed, the reaction solution is cooled to 90° C., and then butyl phosphate, silica sol ethylene glycol and o-nitroacetophenone are added to the reactor, and the mixture is kept at 90° C. for 30 min.

[0134] Example 7

[0135] A core for an aluminum electrolytic capacitor with a specification of 525V 470μF, the core comprising a positive electrode foil, a negative electrode foil, a foil guide strip and an electrolytic paper for isolating the positive electrode foil and the negative electrode foil.

[0136] The positive electrode foil is made of aluminum foil with a purity of 99.99%, and the surface of the positive electrode foil is formed into an aluminum oxide film.

[0137] The negative electrode foil is made of aluminum foil with a purity of 99.8%, and the negative electrode foil has a formation voltage of 2 to 7V.

[0138] The electrolytic paper of the core is a combination of a first electrolytic paper and a second electrolytic paper. After the first electrolytic paper and the second electrolytic paper are used together, ESR=2.73 and withstand voltage value=1020V.

[0139] The electrolytic paper is adsorbed with an electrolyte, which specifically comprises the following components in parts by weight:

[0140]

[0141] The high viscosity additive is polyvinyl alcohol with an amide structure, and the manufacturer is Shenzhen Xinzhoubang Technology Co., Ltd.

[0142] The electrolyte is produced by a method comprising the following steps:

[0143] (1) adding ethylene glycol and glycerol into a reactor and heating the reactor to 140° C., then adding mannitol, polyethylene glycol 4000, a high viscosity additive, and boric acid into the reactor, and keeping the temperature at 140° C. for 60 minutes;

[0144] (2) After the reaction in step (1) is completed, the reaction solution is cooled to 110° C., and then the polymerized carboxylic acid ammonium salt and 8,13-dimethyl-8,12-diene-eicosaldicarboxylammonium are added to the reactor, and the mixture is kept at 110° C. for 60 minutes;

[0145] (3) After the reaction in step (2) is completed, the reaction solution is cooled to 90° C., and then butyl phosphate, silica sol ethylene glycol and o-nitroacetophenone are added to the reactor, and the mixture is kept at 90° C. for 30 min.

[0146] Example 8

[0147] A core for an aluminum electrolytic capacitor with a specification of 525V 470μF, the core comprising a positive electrode foil, a negative electrode foil, a foil guide strip and an electrolytic paper for isolating the positive electrode foil and the negative electrode foil.

[0148] The positive electrode foil is made of aluminum foil with a purity of 99.99%, and the surface of the positive electrode foil is formed into an aluminum oxide film.

[0149] The negative electrode foil is made of aluminum foil with a purity of 99.8%, and the negative electrode foil has a formation voltage of 2 to 7V.

[0150] The electrolytic paper of the core is a combination of a first electrolytic paper and a second electrolytic paper. After the first electrolytic paper and the second electrolytic paper are used together, ESR=2.63 and withstand voltage=970V.

[0151] The electrolytic paper is adsorbed with an electrolyte, which specifically comprises the following components in parts by weight:

[0152]

[0153] The high viscosity additive is polyvinyl alcohol with an amide structure, and the manufacturer is Shenzhen Xinzhoubang Technology Co., Ltd.

[0154] The electrolyte is produced by a method comprising the following steps:

[0155] (1) adding ethylene glycol and glycerol into a reactor and heating the reactor to 140° C., then adding mannitol, polyethylene glycol 4000, a high viscosity additive, and boric acid into the reactor, and keeping the temperature at 140° C. for 60 minutes;

[0156] (2) After the reaction in step (1) is completed, the reaction solution is cooled to 110° C., and then the polymerized carboxylic acid ammonium salt and 8,13-dimethyl-8,12-diene-eicosaldicarboxylammonium are added to the reactor, and the mixture is kept at 110° C. for 60 minutes;

[0157] (3) After the reaction in step (2) is completed, the reaction solution is cooled to 90° C., and then butyl phosphate, silica sol ethylene glycol and o-nitroacetophenone are added to the reactor, and the mixture is kept at 90° C. for 30 min.

[0158] Example 9

[0159] A core for an aluminum electrolytic capacitor with a specification of 525V 470μF, the core comprising a positive electrode foil, a negative electrode foil, a foil guide strip and an electrolytic paper for isolating the positive electrode foil and the negative electrode foil.

[0160] The positive electrode foil is made of aluminum foil with a purity of 99.99%, and the surface of the positive electrode foil is formed into an aluminum oxide film.

[0161] The negative electrode foil is made of aluminum foil with a purity of 99.8%, and the negative electrode foil has a formation voltage of 2 to 7V.

[0162] The electrolytic paper of the core is a combination of a first electrolytic paper and a second electrolytic paper, wherein after the first electrolytic paper and the second electrolytic paper are used together, ESR=2.73 and withstand voltage value=980V.

[0163] The electrolytic paper is adsorbed with an electrolyte, which specifically comprises the following components in parts by weight:

[0164]

[0165] The high viscosity additive is polyvinyl alcohol with an amide structure, and the manufacturer is Shenzhen Xinzhoubang Technology Co., Ltd.

[0166] The electrolyte is produced by a method comprising the following steps:

[0167] (1) adding ethylene glycol and glycerol into a reactor and heating the reactor to 140° C., then adding mannitol, polyethylene glycol 4000, a high viscosity additive, and boric acid into the reactor, and keeping the temperature at 140° C. for 60 minutes;

[0168] (2) After the reaction in step (1) is completed, the reaction solution is cooled to 110° C., and then the polymerized carboxylic acid ammonium salt and 8,13-dimethyl-8,12-diene-eicosaldicarboxylammonium are added to the reactor, and the mixture is kept at 110° C. for 60 minutes;

[0169] (3) After the reaction in step (2) is completed, the reaction solution is cooled to 90° C., and then butyl phosphate, silica sol ethylene glycol and o-nitroacetophenone are added to the reactor, and the mixture is kept at 90° C. for 30 min.

[0170] Example 10

[0171] A core for an aluminum electrolytic capacitor with a specification of 525V 470μF, the core comprising a positive electrode foil, a negative electrode foil, a foil guide strip and an electrolytic paper for isolating the positive electrode foil and the negative electrode foil.

[0172] The positive electrode foil is made of aluminum foil with a purity of 99.99%, and the surface of the positive electrode foil is formed into an aluminum oxide film.

[0173] The negative electrode foil is made of aluminum foil with a purity of 99.8%, and the negative electrode foil has a formation voltage of 2 to 7V.

[0174] The electrolytic paper of the core is a combination of a first electrolytic paper and a second electrolytic paper, wherein after the first electrolytic paper and the second electrolytic paper are used together, ESR=2.80 and withstand voltage value=1000V.

[0175] The electrolytic paper is adsorbed with an electrolyte, which specifically comprises the following components in parts by weight:

[0176]

[0177] The high viscosity additive is polyvinyl alcohol with an amide structure, and the manufacturer is Shenzhen Xinzhoubang Technology Co., Ltd.

[0178] The electrolyte is produced by a method comprising the following steps:

[0179] (1) adding ethylene glycol and glycerol into a reactor and heating the reactor to 140° C., then adding mannitol, polyethylene glycol 4000, a high viscosity additive, and boric acid into the reactor, and keeping the temperature at 140° C. for 60 minutes;

[0180] (2) After the reaction in step (1) is completed, the reaction solution is cooled to 110° C., and then the polymerized carboxylic acid ammonium salt and 8,13-dimethyl-8,12-diene-eicosaldicarboxylammonium are added to the reactor, and the mixture is kept at 110° C. for 60 minutes;

[0181] (3) After the reaction in step (2) is completed, the reaction solution is cooled to 90° C., and then butyl phosphate, silica sol ethylene glycol and o-nitroacetophenone are added to the reactor, and the mixture is kept at 90° C. for 30 min.

[0182] Embodiment 11

[0183] A core for an aluminum electrolytic capacitor with a specification of 410V and 940μF is composed of a component including a positive electrode foil, a negative electrode foil, a foil guide strip and electrolytic paper for isolating the positive electrode foil and the negative electrode foil.

[0184] The positive electrode foil is made of aluminum foil with a purity of 99.99%, and the surface of the positive electrode foil is formed into an aluminum oxide film.

[0185] The negative electrode foil is made of aluminum foil with a purity of 99.8%, and the negative electrode foil has a formation voltage of 2 to 7V.

[0186] The electrolytic paper of the core is a combination of a first electrolytic paper and a second electrolytic paper. After the first electrolytic paper and the second electrolytic paper are used together, ESR=2.20 and withstand voltage value=940V.

[0187] The electrolytic paper is adsorbed with an electrolyte, which specifically comprises the following components in parts by weight:

[0188]

[0189] The high viscosity additive is polyvinyl alcohol with an amide structure, and the manufacturer is Shenzhen Xinzhoubang Technology Co., Ltd.

[0190] The electrolyte is produced by a method comprising the following steps:

[0191] (1) adding ethylene glycol and glycerol into a reactor and heating the reactor to 140° C., then adding mannitol, polyethylene glycol 4000, a high viscosity additive, and boric acid into the reactor, and keeping the temperature at 140° C. for 60 minutes;

[0192] (2) After the reaction in step (1) is completed, the reaction solution is cooled to 110° C., and then the polymerized carboxylic acid ammonium salt and 8,13-dimethyl-8,12-diene-eicosaldicarboxylammonium are added to the reactor, and the mixture is kept at 110° C. for 60 minutes;

[0193] (3) After the reaction in step (2) is completed, the reaction solution is cooled to 90° C., and then butyl phosphate, silica sol ethylene glycol and o-nitroacetophenone are added to the reactor, and the mixture is kept at 90° C. for 30 min.

[0194] Example 12

[0195] A core for an aluminum electrolytic capacitor with a specification of 410V and 940μF is composed of a component including a positive electrode foil, a negative electrode foil, a foil guide strip and electrolytic paper for isolating the positive electrode foil and the negative electrode foil.

[0196] The positive electrode foil is made of aluminum foil with a purity of 99.99%, and the surface of the positive electrode foil is formed into an aluminum oxide film.

[0197] The negative electrode foil is made of aluminum foil with a purity of 99.8%, and the negative electrode foil has a formation voltage of 2 to 7V.

[0198] The electrolytic paper of the core is a combination of a first electrolytic paper and a second electrolytic paper, wherein after the first electrolytic paper and the second electrolytic paper are used together, ESR=2.81 and withstand voltage value=1120V.

[0199] The electrolytic paper is adsorbed with an electrolyte, which specifically comprises the following components in parts by weight:

[0200]

[0201] The high viscosity additive is polyvinyl alcohol with an amide structure, and the manufacturer is Shenzhen Xinzhoubang Technology Co., Ltd.

[0202] The electrolyte is produced by a method comprising the following steps:

[0203] (1) adding ethylene glycol and glycerol into a reactor and heating the reactor to 140° C., then adding mannitol, polyethylene glycol 4000, a high viscosity additive, and boric acid into the reactor, and keeping the temperature at 140° C. for 60 minutes;

[0204] (2) After the reaction in step (1) is completed, the reaction solution is cooled to 110° C., and then the polymerized carboxylic acid ammonium salt and 8,13-dimethyl-8,12-diene-eicosaldicarboxylammonium are added to the reactor, and the mixture is kept at 110° C. for 60 minutes;

[0205] (3) After the reaction in step (2) is completed, the reaction solution is cooled to 90° C., and then butyl phosphate, silica sol ethylene glycol and o-nitroacetophenone are added to the reactor, and the mixture is kept at 90° C. for 30 min.

[0206] Embodiment 13

[0207] A core for an aluminum electrolytic capacitor with a specification of 410V and 940μF is composed of a component including a positive electrode foil, a negative electrode foil, a foil guide strip and electrolytic paper for isolating the positive electrode foil and the negative electrode foil.

[0208] The positive electrode foil is made of aluminum foil with a purity of 99.99%, and the surface of the positive electrode foil is formed into an aluminum oxide film.

[0209] The negative electrode foil is made of aluminum foil with a purity of 99.8%, and the negative electrode foil has a formation voltage of 2 to 7V.

[0210] The electrolytic paper of the core is a combination of a first electrolytic paper and a second electrolytic paper. After the first electrolytic paper and the second electrolytic paper are used together, ESR=2.95 and withstand voltage value=930V.

[0211] The electrolytic paper is adsorbed with an electrolyte, which specifically comprises the following components in parts by weight:

[0212]

[0213] The high viscosity additive is polyvinyl alcohol with an amide structure, and the manufacturer is Shenzhen Xinzhoubang Technology Co., Ltd.

[0214] The electrolyte is produced by a method comprising the following steps:

[0215] (1) adding ethylene glycol and glycerol into a reactor and heating the reactor to 140° C., then adding mannitol, polyethylene glycol 4000, a high viscosity additive, and boric acid into the reactor, and keeping the temperature at 140° C. for 60 minutes;

[0216] (2) After the reaction in step (1) is completed, the reaction solution is cooled to 110° C., and then the polymerized carboxylic acid ammonium salt and 8,13-dimethyl-8,12-diene-eicosaldicarboxylammonium are added to the reactor, and the mixture is kept at 110° C. for 60 minutes;

[0217] (3) After the reaction in step (2) is completed, the reaction solution is cooled to 90° C., and then butyl phosphate, silica sol ethylene glycol and o-nitroacetophenone are added to the reactor, and the mixture is kept at 90° C. for 30 min.

[0218] Embodiment 14

[0219] A core for an aluminum electrolytic capacitor with a specification of 410V and 940μF is composed of a component including a positive electrode foil, a negative electrode foil, a foil guide strip and electrolytic paper for isolating the positive electrode foil and the negative electrode foil.

[0220] The positive electrode foil is made of aluminum foil with a purity of 99.99%, and the surface of the positive electrode foil is formed into an aluminum oxide film.

[0221] The negative electrode foil is made of aluminum foil with a purity of 99.8%, and the negative electrode foil has a formation voltage of 2 to 7V.

[0222] The electrolytic paper of the core is a combination of a first electrolytic paper and a second electrolytic paper, wherein after the first electrolytic paper and the second electrolytic paper are used together, ESR=2.80 and withstand voltage value=930V.

[0223] The electrolytic paper is adsorbed with an electrolyte, which specifically comprises the following components in parts by weight:

[0224]

[0225] The high viscosity additive is polyvinyl alcohol with an amide structure, and the manufacturer is Shenzhen Xinzhoubang Technology Co., Ltd.

[0226] The electrolyte is produced by a method comprising the following steps:

[0227] (1) adding ethylene glycol and glycerol into a reactor and heating the reactor to 140° C., then adding mannitol, polyethylene glycol 4000, a high viscosity additive, and boric acid into the reactor, and keeping the temperature at 140° C. for 60 minutes;

[0228] (2) After the reaction in step (1) is completed, the reaction solution is cooled to 110° C., and then the polymerized carboxylic acid ammonium salt and 8,13-dimethyl-8,12-diene-eicosaldicarboxylammonium are added to the reactor, and the mixture is kept at 110° C. for 60 minutes;

[0229] (3) After the reaction in step (2) is completed, the reaction solution is cooled to 90° C., and then butyl phosphate, silica sol ethylene glycol and o-nitroacetophenone are added to the reactor, and the mixture is kept at 90° C. for 30 min.

[0230] Embodiment 15

[0231] An aluminum electrolytic capacitor with a specification of 550V 470μF, the aluminum electrolytic capacitor comprises a lead terminal, a cover plate, a sleeve, an electronic tape, an aluminum shell, an insulating film, and the core of the aluminum electrolytic capacitor described in Example 1. The product structure diagram of the aluminum electrolytic capacitor is shown in FIG. Figure 2 shown.

[0232] Example 16

[0233] An aluminum electrolytic capacitor with a specification of 550V470μF, comprising a lead terminal, a cover plate, a sleeve, an electronic tape, an aluminum shell, an insulating film, and the core of the aluminum electrolytic capacitor described in Example 2.

[0234] Embodiment 17

[0235] An aluminum electrolytic capacitor with a specification of 550V470μF, comprising a lead terminal, a cover plate, a sleeve, an electronic tape, an aluminum shell, an insulating film, and the core of the aluminum electrolytic capacitor described in Example 3.

[0236] Embodiment 18

[0237] An aluminum electrolytic capacitor with a specification of 550V470μF, comprising a lead terminal, a cover plate, a sleeve, an electronic tape, an aluminum shell, an insulating film, and the core of the aluminum electrolytic capacitor described in Example 4.

[0238] Embodiment 19

[0239] An aluminum electrolytic capacitor with a specification of 550V470μF, comprising a lead terminal, a cover plate, a sleeve, an electronic tape, an aluminum shell, an insulating film, and the core of the aluminum electrolytic capacitor described in Example 5.

[0240] Embodiment 20

[0241] An aluminum electrolytic capacitor with a specification of 525V470μF, comprising a lead terminal, a cover plate, a sleeve, an electronic tape, an aluminum shell, an insulating film, and the core of the aluminum electrolytic capacitor described in Example 6.

[0242] Embodiment 21

[0243] An aluminum electrolytic capacitor with a specification of 525V470μF, comprising a lead terminal, a cover plate, a sleeve, an electronic tape, an aluminum shell, an insulating film, and the core of the aluminum electrolytic capacitor described in Example 7.

[0244] Embodiment 22

[0245] An aluminum electrolytic capacitor with a specification of 525V470μF, comprising a lead terminal, a cover plate, a sleeve, an electronic tape, an aluminum shell, an insulating film, and the core of the aluminum electrolytic capacitor described in Example 8.

[0246] Embodiment 23

[0247] An aluminum electrolytic capacitor with a specification of 525V470μF, comprising a lead terminal, a cover plate, a sleeve, an electronic tape, an aluminum shell, an insulating film, and the core of the aluminum electrolytic capacitor described in Example 9.

[0248] Embodiment 24

[0249] An aluminum electrolytic capacitor with a specification of 525V470μF, comprising a lead terminal, a cover plate, a sleeve, an electronic tape, an aluminum shell, an insulating film, and the core of the aluminum electrolytic capacitor described in Example 10.

[0250] Embodiment 25

[0251] An aluminum electrolytic capacitor with a specification of 410V 940μF, comprising a lead terminal, a cover plate, a sleeve, an electronic tape, an aluminum shell, an insulating film, and a core of the aluminum electrolytic capacitor described in Example 11.

[0252] Embodiment 26

[0253] An aluminum electrolytic capacitor with a specification of 410V 940μF, comprising a lead terminal, a cover plate, a sleeve, an electronic tape, an aluminum shell, an insulating film, and the core of the aluminum electrolytic capacitor described in Example 12.

[0254] Embodiment 27

[0255] An aluminum electrolytic capacitor with a specification of 410V 940μF, comprising a lead terminal, a cover plate, a sleeve, an electronic tape, an aluminum shell, an insulating film, and the core of the aluminum electrolytic capacitor described in Example 13.

[0256] Embodiment 28

[0257] An aluminum electrolytic capacitor with a specification of 410V 940μF, comprising a lead terminal, a cover plate, a sleeve, an electronic tape, an aluminum shell, an insulating film, and the core of the aluminum electrolytic capacitor described in Example 14.

[0258] Test Example 1

[0259] The 14 aluminum electrolytic capacitors of Examples 15 to 28 were tested, and it was found that all of the 14 aluminum electrolytic capacitors met the requirements of continuous operation for more than 5000 hours at a 105°C environment and a rated working voltage, and continuous operation for more than 1000 hours at an 85°C environment and a voltage exceeding the rated working voltage by 25 to 50V; as shown in Table 3 below.

[0260] Table 3 Continuous working time test results of aluminum electrolytic capacitors

[0261]

[0262] Test Example 2

[0263] The negative electrode foil of the 5 aluminum electrolytic capacitors in Examples 15 to 19 was replaced with an aluminum foil with a purity of 98% to obtain 5 comparative aluminum electrolytic capacitors. In addition, the positive electrode foil of the 5 aluminum electrolytic capacitors in Examples 15 to 19 was replaced with an aluminum foil with a purity of 98% to obtain another 5 comparative aluminum electrolytic capacitors. These 10 comparative aluminum electrolytic capacitors and the 5 aluminum electrolytic capacitors in Examples 15 to 19 were operated continuously for 5000 hours at a rated working voltage at 105°C. Then, the capacity and leakage current of the 15 aluminum electrolytic capacitors were tested. The results are shown in Table 4. It can be seen from Table 4 that when the negative electrode foil of the core of the aluminum electrolytic capacitor is made of aluminum foil with a purity of 99.8%, the capacitance change is smaller and the leakage current is smaller than when the aluminum foil with a purity of 98% is used; when the positive electrode foil of the core of the aluminum electrolytic capacitor is made of aluminum foil with a purity of 99.99%, the capacitance change is smaller and the leakage current is smaller than when the aluminum foil with a purity of 98%.

[0264] Table 4 Test results of using aluminum foil of different purity as negative electrode foil

[0265]

[0266] Test Example 3

[0267] Two types of electrolytic paper of the matching scheme numbered 1 in Table 1 are used as electrolytic paper to absorb the core of aluminum electrolytic capacitors made of different electrolytes and further made into 3 types of aluminum electrolytic capacitors with specifications of 550V470μF. After these 3 types of aluminum electrolytic capacitors are continuously operated for 5000 hours at a 105°C environment and a rated working voltage or continuously operated for 1000 hours at an 85°C environment and a voltage exceeding the rated working voltage by 25 to 50V, the appearance and leakage of these 3 types of aluminum electrolytic capacitors are shown in Table 5. It can be seen from Table 5 that the electrolyte of the present invention can ensure that the capacitor can continuously operate for more than 5000 hours at the rated upper limit temperature (105°C) and the rated working voltage, and can also ensure that it can continuously operate for more than 1000 hours at an ambient temperature of 85°C and a voltage exceeding the rated working voltage by 25 to 50V.

[0268] Table 5 Test results using different electrolytes

[0269]

[0270] Test Example 4

[0271] Referring to the method of Example 11, the electrolytic paper of Example 11 is replaced with the first electrolytic paper and the second electrolytic paper that meet the requirements of "ESR = 3.55 and withstand voltage = 1030V after the first electrolytic paper and the second electrolytic paper are used together" (such as the combination scheme numbered 19 in Table 2) to prepare the core of the aluminum electrolytic capacitor; then, the prepared aluminum electrolytic capacitor core is used to prepare an aluminum electrolytic capacitor with a specification of 410V940μF with reference to the components of the aluminum electrolytic capacitor of Example 25, and the aluminum electrolytic capacitor is used as a control to perform withstand voltage and loss angle detection together with the aluminum electrolytic capacitor of Example 25. The results are shown in Table 6 below. It can be seen from Table 6 that compared with the use of the first electrolytic paper and the second electrolytic paper that meet the requirements of "ESR = 3.55 and withstand voltage = 1030V after the first electrolytic paper and the second electrolytic paper are used together", the aluminum electrolytic capacitor prepared by using the first electrolytic paper and the second electrolytic paper that meet the requirements of "ESR = 2.20 and withstand voltage = 940V after the first electrolytic paper and the second electrolytic paper are used together" has a higher withstand voltage value and a lower loss angle.

[0272] Table 6 Test results of withstand voltage and loss angle of aluminum electrolytic capacitors

[0273]

[0274] It should be noted that the embodiments described above are only used to explain the present invention and do not constitute any limitation of the present invention. The present invention has been described with reference to the embodiments, but it should be understood that the words used therein are descriptive and explanatory words, rather than restrictive words. The present invention may be modified as specified within the scope of the claims of the present invention, and the present invention may be revised without departing from the scope and spirit of the present invention. Although the present invention described therein relates to specific methods, materials and embodiments, it does not mean that the present invention is limited to the specific examples disclosed therein, on the contrary, the present invention can be extended to all other methods and applications with the same functions.

Claims

1. A core of an aluminum electrolytic capacitor, characterized in that: The core comprises a positive electrode foil, a negative electrode foil, electrolytic paper and a conductive foil strip, wherein the positive electrode foil is made of aluminum foil with a purity of more than 99.99%, and the negative electrode foil is made of aluminum foil with a purity of more than 99.5%.

2. The core according to claim 1, characterized in that The positive electrode foil is made of aluminum foil with a purity of 99.99%; and / or The surface of the positive electrode foil is formed into an aluminum oxide film; and / or The negative electrode foil is made of aluminum foil with a purity of 99.8%; and / or The negative electrode foil has a formation voltage of 2-7V.

3. The core according to claim 1 or 2, characterized in that: The electrolytic paper of the core includes a first electrolytic paper and a second electrolytic paper, and the first electrolytic paper and the second electrolytic paper are the same or different.

4. The core according to claim 3, characterized in that The selection index of the electrolytic paper is ESR and withstand voltage value; The first electrolytic paper and the second electrolytic paper of the core of the aluminum electrolytic capacitor with a voltage of ≥500V meet the standards of ESR≤2.80 and withstand voltage ≥950V after being used together; and / or The first electrolytic paper and the second electrolytic paper of the core of the aluminum electrolytic capacitor with a voltage of less than 500V meet the standards of ESR≤2.95 and withstand voltage value≥930V after being used together.

5. The core according to any one of claims 1 to 4, characterized in that: The electrolytic paper is adsorbed with an electrolyte, and the components of the electrolyte include ethylene glycol, glycerol, mannitol, polyethylene glycol 4000, a high viscosity additive, boric acid, a polymeric carboxylic acid ammonium salt, 8,13-dimethyl-8,12-diene-eicosapentadicarboxylic ammonium, butyl phosphate, silica sol ethylene glycol, and o-nitroacetophenone.

6. The core according to claim 5, characterized in that The high viscosity additive is at least one selected from modified polyvinyl alcohols; preferably at least one selected from polyvinyl alcohol polymers having an amide structure.

7. The core according to claim 5 or 6, characterized in that: The electrolyte comprises the following components in parts by weight: 40-50 parts of ethylene glycol 8. The core according to any one of claims 5 to 7, characterized in that: The electrolyte is produced by a method comprising the following steps: (1) adding ethylene glycol and glycerol into a reactor and heating the reactor to 130-150° C., then adding mannitol, polyethylene glycol 4000, a high viscosity additive, and boric acid into the reactor, and keeping the temperature at 130-150° C. for 45-75 minutes; (2) After the reaction in step (1) is completed, the reaction solution is cooled to 100-120° C., and then the polymerized carboxylic acid ammonium salt and 8,13-dimethyl-8,12-diene-eicosaldicarboxylammonium are added to the reactor, and the mixture is kept at 100-120° C. for 45-75 minutes; (3) After the reaction in step (2) is completed, the reaction solution is cooled to 80-95° C., and then butyl phosphate, silica sol ethylene glycol and o-nitroacetophenone are added to the reactor, and the mixture is kept at 80-95° C. for 20-40 minutes.

9. An aluminum electrolytic capacitor, characterized in that: The aluminum electrolytic capacitor includes the core according to any one of claims 1 to 8.

10. The aluminum electrolytic capacitor according to claim 9, characterized in that: The aluminum electrolytic capacitor also includes a cover plate, a sleeve, an aluminum shell, and an insulating film.

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