CN112670089A - High-voltage aluminum electrolytic capacitor and preparation method thereof - Google Patents
High-voltage aluminum electrolytic capacitor and preparation method thereof Download PDFInfo
- Publication number
- CN112670089A CN112670089A CN202011432828.6A CN202011432828A CN112670089A CN 112670089 A CN112670089 A CN 112670089A CN 202011432828 A CN202011432828 A CN 202011432828A CN 112670089 A CN112670089 A CN 112670089A
- Authority
- CN
- China
- Prior art keywords
- parts
- minutes
- heating
- ammonium
- temperature
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Landscapes
- Fixed Capacitors And Capacitor Manufacturing Machines (AREA)
Abstract
The invention discloses a preparation method of a high-voltage aluminum electrolytic capacitor and the capacitor, comprising the following steps: material slitting: cutting the raw material to reach the specified size of the capacitor; riveting and rolling: rolling the cut raw materials into a core of the capacitor on a riveting and rolling machine; and (3) drying: drying the rolled core; impregnation: soaking the dried core in liquid electrolyte; assembling and sealing: adding materials such as an aluminum shell and a cover plate to the impregnated core, riveting positive and negative electrode foil strips of the core with a positive electrode leading-out terminal and a negative electrode leading-out terminal led out from the cover plate respectively, then, introducing a crimping machine, sealing and forming, and isolating a sealed space formed inside the capacitor from the outside; sleeving: sleeving a plastic sleeve on the capacitor formed by sealing; an aging step, etc.
Description
Technical Field
The invention belongs to the technical field of electric appliances, and particularly relates to a preparation method of a high-voltage aluminum electrolytic capacitor and the capacitor.
Background
The capacitor is the most critical component in the electric appliance, and especially in the modern times of increasingly developed science and technology and high intelligence, the capacitor is an essential component in the electric appliance. The aluminum electrolytic capacitor is the most special capacitor in the capacitor family, and the aluminum electrolytic capacitor is highly intelligent, miniaturized, high in power and the like.
The traditional aluminum electrolytic capacitor is divided into low voltage, medium voltage and high voltage, and the highest rated voltage is 450VDC generally. In recent years, with the rapid rise of energy conservation, environmental protection, new energy and the like, the voltage of a module inside a corresponding electric appliance or the output voltage is obviously increased to 500V, 600V, 700V or even more than 1000V. And the demand of capacitors with rated voltage exceeding 450V on the market is increasing day by day, and the voltage of the aluminum electrolytic capacitor is also developing to higher voltage.
At present, the rated voltage of the aluminum electrolytic capacitor is used in electrical appliances by ultrahigh voltage products such as 500V,550V and the like, but the aluminum electrolytic capacitor with the voltage of more than 600V is still not mature in technology. And the use end, because the voltage is too high, often need 2, or 3, even more products to establish ties, can reach required voltage requirement, and the more the electric capacity is established ties, and the influence in the aspect of the adverse factor is just bigger, and wherein the most important is: 1) if the module voltage is not too high, such as within 500V,550V, 600V and the like, if a single capacitor is used, the rated withstand voltage is insufficient, and if more than 2 capacitors are used in series, the design is possibly excessive; 2) when the high-voltage module is used in a module with higher voltage, a plurality of capacitors may be connected in series, voltage division is uneven due to the factors of the capacitors and the parameter difference of the aluminum electrolytic capacitors, part of the capacitors bear higher voltage, the other part of the capacitors bear lower voltage, and products bearing higher voltage exceed the rated voltage bearing capacity, so that the short-term failure or the short-term service life is caused; 3) the stability of the module is reduced, the capacitors are connected in series, and the whole module fails as long as 1 capacitor fails; if the voltage resistance of the capacitors is sufficient, all the capacitors are connected in parallel, and if some capacitor fails, the whole module can still work, and only the output power is reduced.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a preparation method of a high-voltage aluminum electrolytic capacitor and the capacitor, and the invention is brief and has the core invention point and technical effect of the specification.
In order to achieve the purpose, the preparation method of the high-voltage aluminum electrolytic capacitor and the specific technical scheme of the capacitor are as follows:
a preparation method of a high-voltage aluminum electrolytic capacitor comprises the following steps:
material slitting: cutting the raw material to reach the specified size of the capacitor;
riveting and rolling: rolling the cut raw materials into a core of the capacitor on a riveting and rolling machine;
and (3) drying: drying the rolled core;
impregnation: soaking the dried core in liquid electrolyte;
assembling and sealing: adding materials such as an aluminum shell and a cover plate to the impregnated core, riveting positive and negative electrode foil strips of the core with a positive electrode leading-out terminal and a negative electrode leading-out terminal led out from the cover plate respectively, then, introducing a crimping machine, sealing and forming, and isolating a sealed space formed inside the capacitor from the outside;
sleeving: sleeving a plastic sleeve on the capacitor formed by sealing;
and (3) aging: applying rated DC voltage and current to the completed product in special equipment to repair the damaged alumina layer of the anode foil in the capacitor at specified temperature for specified time;
a sorting step: and (3) performing 100% full inspection on the electrical property of the aged capacitor, and rejecting products with abnormal performance.
Further, the material slitting step: the anode foil is electrochemically etched by using 1.0-5.0% of inorganic acid to form etching holes with a diameter of 1.0-2.0 μm.
Further, the material slitting step: the anode aluminum foil and the cathode aluminum foil are both corrosion foils which are obtained by corrosion with required specific volume, and the formation foil is prepared by growing an oxide film after the corrosion foils are formed; the formation main material is boric acid water solution, and an alumina protective film which can resist high pressure, has a compact structure and is uniform is formed through multi-stage formation under the temperature condition of the formation liquid.
Further, the material slitting step: the temperature of the formation liquid is 85-95 ℃, and the multi-stage formation grade is 5-7.
Further, the impregnation step: the electrolyte contains an additive which is added into the electrolyte,
the additive comprises the following ingredients in parts by weight: 40-50 parts of ethylene glycol, 10-20 parts of water, 15-25 parts of diethylene glycol, 10-20 parts of polyethylene glycol, 5-10 parts of polyvinyl alcohol and 10-20 parts of boric acid;
the preparation steps of the additive are as follows:
adding 40-50 parts of ethylene glycol and 10-20 parts of water into a container, stirring, heating to 80 +/-5 ℃, and keeping the temperature for 30 +/-5 minutes;
then adding 15-25 parts of diethylene glycol, 10-20 parts of polyethylene glycol and 5-10 parts of polyvinyl alcohol, stirring, heating to 100 +/-5 ℃, preserving heat for 30 +/-5 minutes,
and finally, adding 10-20 parts of boric acid into the container, stirring, heating to 120 +/-5 ℃, preserving heat for 12 +/-0.5 hours, and cooling to below 60 ℃.
Further, the impregnation step: the electrolyte contains an additive which is added into the electrolyte,
the additive comprises the following ingredients in parts by weight: 40-50 parts of ethylene glycol, 15-30 parts of water, 15-25 parts of glycerol, 10-20 parts of polyvinyl alcohol and 10-20 parts of sebacic acid;
adding 40-50 parts of ethylene glycol and 10-20 parts of water into a container, stirring, heating to 80 +/-5 ℃, and keeping the temperature for 30 +/-5 minutes;
then adding 15-25 parts of glycerol and 10-20 parts of polyvinyl alcohol, stirring, heating to 100 +/-5 ℃, preserving heat for 30 +/-5 minutes,
and finally, adding 10-20 parts of sebacic acid into the container, stirring, heating to 120 +/-5 ℃, preserving heat for 12 +/-0.5 hours, and cooling to below 60 ℃.
Further, the impregnation step: the electrolyte contains an additive which is added into the electrolyte,
the additive comprises the following ingredients in parts by weight: 40-50 parts of ethylene glycol, 20-30 parts of water, 15-25 parts of mannitol, 10-20 parts of polyvinyl alcohol and 10-20 parts of octadecenedioic and octadecanoic diacid;
adding 40-50 parts of ethylene glycol and 10-20 parts of water into a container, stirring, heating to 80 +/-5 ℃, and keeping the temperature for 30 +/-5 minutes;
then adding 15-25 parts of mannitol and 10-20 parts of polyvinyl alcohol, stirring, heating to 100 +/-5 ℃, preserving heat for 30 +/-5 minutes,
and finally, adding 10-20 parts of the carbendazim octadecadioic acid into the container, heating to 120 +/-5 ℃, preserving the heat for 12 +/-0.5 hours, and cooling to below 60 ℃.
Further, the impregnation step: the electrolyte comprises the following ingredients in parts by weight: 5-10 parts of triethylamine, 5-10 parts of diethyl carbonate, 5-10 parts of benzoic acid, 40-50 parts of ethylene glycol, 10-20 parts of ammonium dodecanedioate, 8-15 parts of ammonium sebacate, 1-3 parts of ammonium pentaborate, 5-15 parts of an additive, 0.5-1 part of phosphoric acid, 0.5-2.5 parts of p-nitrobenzoic acid and 5-15 parts of a nano silicon dioxide EG solution;
the electrolyte is prepared by the following steps:
mixing 5-10 parts of triethylamine and 5-10 parts of diethyl carbonate in a container, heating to 160 +/-10 ℃, keeping the temperature for 3 +/-0.5 hours, cooling to normal temperature and normal pressure,
adding 5-10 parts of benzoic acid to react for 30 +/-5 minutes,
adding 40-50 parts of ethylene glycol, heating to 80 +/-5 ℃,
adding 10-20 parts of ammonium dodecanedioate, 8-15 parts of ammonium sebacate, 1-3 parts of ammonium pentaborate, 5-15 parts of additive and 0.5-1 part of phosphoric acid, heating to 150 +/-10 ℃, preserving heat for 90 +/-5 minutes, and cooling to 110 +/-5 ℃;
adding 0.5-2.5 parts of p-nitrobenzoic acid, preserving the heat for 10 +/-3 minutes, and cooling to 90 +/-5 ℃;
adding 5-15 parts of nano silicon dioxide EG solution, preserving the temperature for 10 +/-3 minutes, and cooling to below 60 ℃ for use.
Further, the impregnation step: the electrolyte comprises the following ingredients in parts by weight: 5-10 parts of trimethylamine, 3-5 parts of diethyl carbonate, 3-5 parts of ethyl methyl carbonate, 5-15 parts of sebacic acid, 40-50 parts of ethylene glycol, 10-20 parts of ammonium dodecanedioate, 8-15 parts of ammonium sebacate, 1-3 parts of ammonium pentaborate, 5-15 parts of additives, 0.5-1 part of monobutyl phosphate, 0.5-2.5 parts of p-nitrobenzyl alcohol and 5-15 parts of nano silicon dioxide EG solution;
the electrolyte is prepared by the following steps:
mixing 5-10 parts of trimethylamine, 3-5 parts of diethyl carbonate and 3-5 parts of methyl ethyl carbonate in a container, heating to 160 +/-10 ℃, keeping the temperature for 3 +/-0.5 hours when the air pressure reaches 8-15 atmospheres, cooling to normal temperature and normal pressure,
adding 5-15 parts of sebacic acid to react for 30 +/-5 minutes,
adding 40-50 parts of ethylene glycol, heating to 80 +/-5 ℃,
adding 10-20 parts of ammonium dodecanedioate, 8-15 parts of ammonium sebacate, 1-3 parts of ammonium pentaborate, 5-15 parts of additive and 0.5-1 part of monobutyl phosphate, heating to 150 +/-10 ℃, preserving heat for 90 +/-5 minutes, and cooling to 110 +/-5 ℃;
adding 0.5-2.5 parts of p-nitrobenzol, preserving the heat for 10 +/-3 minutes, and cooling to 90 +/-5 ℃;
adding 5-15 parts of nano silicon dioxide EG solution, preserving the temperature for 10 +/-3 minutes, and cooling to below 60 ℃ for use.
Further, the impregnation step: the electrolyte comprises the following ingredients in parts by weight:
5-10 parts of triethanolamine, 5-10 parts of methyl ethyl carbonate, 5-15 parts of dodecanedioic acid, 40-50 parts of ethylene glycol, 10-20 parts of ammonium dodecanedioate, 8-15 parts of ammonium sebacate, 1-3 parts of ammonium pentaborate, 5-15 parts of an additive, 0.5-1 part of butyl phosphate, 0.5-2.5 parts of p-nitroanisole and 5-15 parts of a nano silicon dioxide EG solution.
The electrolyte is prepared by the following steps:
mixing 5-10 parts of triethanolamine and 5-10 parts of methyl ethyl carbonate in a container, heating to 160 +/-10 ℃, keeping the temperature for 3 +/-0.5 hours until the air pressure reaches 8-15 atmospheric pressures, cooling to normal temperature and normal pressure,
adding 10-20 parts of ammonium dodecanedioic acid for reaction for 30 +/-5 minutes,
adding 40-50 parts of ethylene glycol, heating to 80 +/-5 ℃,
adding 0-20 parts of ammonium dodecanedioate, 8-15 parts of ammonium sebacate, 1-3 parts of ammonium pentaborate, 5-15 parts of additive and 0.5-1 part of butyl phosphate, heating to 150 +/-10 ℃, keeping the temperature for 90 +/-5 minutes, and cooling to 110 +/-5 ℃;
adding 0.5-2.5 parts of p-nitroanisole, preserving the heat for 10 +/-3 minutes, and cooling to 90 +/-5 ℃;
adding 5-15 parts of nano silicon dioxide EG solution, preserving the temperature for 10 +/-3 minutes, and cooling to below 60 ℃ for use.
Further, the electrolytic paper contained in the raw material is subjected to multi-stage purification and long cylinder mould manufacturing process, and the steps are as follows:
refining and purifying: carrying out multi-stage purification on the electrolytic paper raw material;
pulping: breaking up raw materials of the electrolytic paper, grinding and branching to make the paper pulp have more binding force;
papermaking: the electrolytic paper is made by long net or round net, and is compounded;
and (3) drying: removing part of water by adopting a narrowing mode, and drying the electrolytic paper by adopting a steam mode;
paper rolling: and winding the dried electrolytic paper into a paper roll with a specified size, and packaging.
Further, papermaking: the paper pulp with the low concentration of 0.1-0.3% is made through a net part, the low-density electrolytic paper is made through a cylinder net, the high-density electrolytic paper is made through a fourdrinier net, the electrolytic paper is formed by compounding the electrolytic paper made through the cylinder net and the fourdrinier net, and the paper pulp has high voltage resistance and low resistivity.
A capacitor manufactured by the method for manufacturing the high-voltage aluminum electrolytic capacitor comprises the following steps: the electrolytic paper is characterized in that a core is formed by sequentially overlapping and rolling a cathode foil, electrolytic paper and an anode foil, an aluminum shell is sleeved outside the core, a cover plate is connected with an opening of the aluminum shell, a sleeve is sleeved outside the aluminum shell, and a positive leading-out terminal and a negative leading-out terminal are led out of the core and penetrate out of the cover plate.
Compared with the prior art, the invention has the following beneficial effects:
1) the direct current voltage circuit can bear the impact of ultrahigh voltage, the effective value of the voltage is within 600V, the peak voltage is within 650V, and the direct current voltage circuit can be used, so that the application range of the aluminum electrolytic capacitor in the aspect of high voltage is widened.
2) The problem of 500 ~ 600V need use 2 electric capacity series connections before having solved, the design is excessive, 1200V need use 3 electric capacity series connections, also can fall 2 series connections can, reduced the uneven risk of voltage distribution to the probability of failure of electric capacity and even whole equipment has been reduced.
3) The power supply can provide power for new energy modules and electric appliances with ultrahigh voltage requirements, and the service life of the power supply is as long as more than 6 years.
Drawings
FIG. 1 is a flow chart of a method for manufacturing a high-voltage aluminum electrolytic capacitor according to the present invention;
FIG. 2 is a structural view of a capacitor obtained by the manufacturing method of the present invention.
The reference numbers in the figures illustrate: the electrolytic cell comprises a core 1, an aluminum shell 2, a cover plate 3, a sleeve 4, electrolytic paper 5, a cathode foil 6, an anode foil 7, a positive leading-out terminal 8 and a negative leading-out terminal 9.
Detailed Description
In order to better understand the purpose, structure and function of the present invention, the following will describe a method for manufacturing a high voltage aluminum electrolytic capacitor and the capacitor of the present invention in detail with reference to fig. 1-2.
As shown in fig. 2, a capacitor manufactured by the above method for manufacturing a high-voltage aluminum electrolytic capacitor includes: the core 1 is formed by sequentially overlapping and rolling a cathode foil 6, electrolytic paper 5 and an anode foil 7, an aluminum shell 2 is sleeved outside the core 1, a cover plate 3 connected with an opening of the aluminum shell 2 and a sleeve 4 sleeved outside the aluminum shell 2, and a positive lead-out terminal 8 and a negative lead-out terminal 9 are led out of the core 1 and penetrate out of the cover plate 3. Capacitor structural design has adopted electrified voltage negative pole paper tinsel, two to lead foil strip, ultrasonic spot welding, promotes capacitor's current bearing capacity and product reliability. And secondary welding is adopted between the foil guide strip and the leading-out terminal of the cover plate 3, so that the riveting resistance is reduced, and the conductive capacity of the contact part is improved.
The technological process for preparing the capacitor is shown in figure 1, and the invention provides a preparation method of a high-voltage aluminum electrolytic capacitor, which comprises the following steps:
1) slitting materials: according to the design requirement, various suitable raw materials are selected, including the anode foil 7, the cathode foil 6 and the electrolytic paper 5, and the raw materials are cut according to the required width so as to be beneficial to reaching the specified size of the capacitor. The anode aluminum foil and the cathode aluminum foil are both corrosion foils which are obtained by corrosion with required specific volume, and the formation foil is prepared by growing an oxide film after the corrosion foils are formed; the formation main material is boric acid water solution, and an alumina protective film which can resist high pressure, has a compact structure and is uniform is formed through multi-stage formation under the temperature condition of the formation liquid; the temperature of the formation liquid is 85-95 ℃, and the multi-stage formation grade is 5-7.
2) Riveting and rolling: the anode foil 7, the cathode foil 6 and the electrolytic paper 5 which are cut in the front are added with (positive and negative) foil guiding strips, adhesive tapes and the like, and the mixture is rolled into the heart of the capacitor on a riveting and rolling machine, namely the core 1.
3) Drying: and (3) putting the core 1 which is coiled in the front into a high-temperature drying box, and removing moisture in the core 1 to prevent the moisture in the material from influencing the performance of the capacitor.
4) Impregnation: the dried core 1 is soaked in liquid electrolyte to produce the expected capacity.
5) Assembling and sealing: adding materials such as an aluminum shell and a cover plate 3 into the impregnated core 1, riveting the core foil guide strip and the cover plate 3 with a lead-out aluminum terminal, then, introducing a curling machine, sealing and forming, forming a sealing space inside the capacitor, and isolating the small environment inside the capacitor from the outside.
6) Sleeving a sleeve: the plastic sleeve is sleeved on the capacitor with the front sealed and formed, the trademark, the rated voltage, the rated capacity, the temperature and the cathode mark of the capacitor are printed on the sleeve 4, the sleeve 4 mainly plays a role in marking, and in addition, the plastic sleeve can also play an insulating role in abnormal use.
7) Aging: the aluminum oxide layer damaged by the anode foil in the capacitor in the steps of slitting and winding is repaired by adding rated direct current voltage and current to the sleeved product in special equipment at a specified temperature and for a specified time.
8) Sorting: and (3) performing 100% full inspection on the electrical property of the aged capacitor, and rejecting products with abnormal performance.
The main improvements of the design are as follows:
1) the anode foil of the ultra-high voltage soldering lug aluminum electrolytic capacitor has large corrosion holes, is formed by inorganic acidification, has good quality and thick thickness of aluminum oxide on the surface of the anode foil, and has strong capability of bearing ultra-high voltage, and the highest voltage can reach 850 VF.
2) The electrolyte of the high-voltage soldering lug aluminum electrolytic capacitor is prepared by adopting a mixed solvent formed by matching various solvents, an ultrahigh-voltage long-carbon branched chain organic solute, various functional additives and the like through a strict cooking process, and can bear long-term impact of voltage above ultrahigh voltage 650V.
3) The electrolytic paper for the high-voltage soldering lug aluminum electrolytic capacitor adopts a long cylinder manufacturing process and can bear voltage impact more than two times of ultrahigh voltage 600V.
4) The multistage aging mode improves the aging effect and the disposable yield. The soldering lug aluminum electrolytic capacitor can be safely used within the ultrahigh voltage of 600V.
Wherein, the material slitting step: the anode foil is electrochemically etched by using 0.5-10.0% of inorganic acid to form etching holes with a diameter of 1.0-2.0 μm.
Three examples of additives according to the invention
In the additive 1 in the embodiment 1, the ingredients comprise the following components in parts by weight: 40-50 parts of ethylene glycol, 10-20 parts of water, 15-25 parts of diethylene glycol, 10-20 parts of polyethylene glycol, 5-10 parts of polyvinyl alcohol and 10-20 parts of boric acid;
the preparation steps of the additive are as follows:
adding 40-50 parts of ethylene glycol and 10-20 parts of water into a container, stirring, heating to 80 +/-5 ℃, and keeping the temperature for 30 +/-5 minutes;
then adding 15-25 parts of diethylene glycol, 10-20 parts of polyethylene glycol and 5-10 parts of polyvinyl alcohol, stirring, heating to 100 +/-5 ℃, preserving heat for 30 +/-5 minutes,
and finally, adding 10-20 parts of boric acid into the container, stirring, heating to 120 +/-5 ℃, preserving heat for 12 +/-0.5 hours, and cooling to below 60 ℃.
Further, the impregnation step: the electrolyte contains an additive which is added into the electrolyte,
the additive comprises the following ingredients in parts by weight: 40-50 parts of ethylene glycol, 15-30 parts of water, 15-25 parts of glycerol, 10-20 parts of polyvinyl alcohol and 10-20 parts of sebacic acid;
further, the impregnation step: the electrolyte contains an additive which is added into the electrolyte,
the additive comprises the following ingredients in parts by weight: 40-50 parts of ethylene glycol, 20-30 parts of water, 15-25 parts of mannitol, 10-20 parts of polyvinyl alcohol and 10-20 parts of octadecenedioic and octadecanoic diacid;
three examples relating to electrolytes of the present invention
Example 1
The electrolyte comprises the following ingredients in parts by weight: 5-10 parts of triethylamine, 5-10 parts of diethyl carbonate, 5-10 parts of benzoic acid, 40-50 parts of ethylene glycol, 10-20 parts of ammonium dodecanedioate, 8-15 parts of ammonium sebacate, 1-3 parts of ammonium pentaborate, 5-15 parts of an additive, 0.5-1 part of phosphoric acid, 0.5-2.5 parts of p-nitrobenzoic acid and 5-15 parts of a nano silicon dioxide EG solution;
example 2
The electrolyte comprises the following ingredients in parts by weight: 5-10 parts of trimethylamine, 3-5 parts of diethyl carbonate, 3-5 parts of ethyl methyl carbonate, 5-15 parts of sebacic acid, 40-50 parts of ethylene glycol, 10-20 parts of ammonium dodecanedioate, 8-15 parts of ammonium sebacate, 1-3 parts of ammonium pentaborate, 5-15 parts of additives, 0.5-1 part of monobutyl phosphate, 0.5-2.5 parts of p-nitrobenzyl alcohol and 5-15 parts of nano silicon dioxide EG solution;
example 3
The electrolyte comprises the following ingredients in parts by weight:
5-10 parts of triethanolamine, 5-10 parts of methyl ethyl carbonate, 5-15 parts of dodecanedioic acid, 40-50 parts of ethylene glycol, 10-20 parts of ammonium dodecanedioate, 8-15 parts of ammonium sebacate, 1-3 parts of ammonium pentaborate, 5-15 parts of an additive, 0.5-1 part of butyl phosphate, 0.5-2.5 parts of p-nitroanisole and 5-15 parts of a nano silicon dioxide EG solution.
The electrolytic paper is subjected to multi-stage purification and long cylinder manufacturing process, and the steps are as follows:
refining and purifying: carrying out multi-stage purification on the electrolytic paper raw material;
pulping: breaking up raw materials of the electrolytic paper, grinding and branching to make the paper pulp have more binding force;
papermaking: the electrolytic paper is made by long net or round net, and is compounded;
and (3) drying: removing part of water by adopting a narrowing mode, and drying the electrolytic paper by adopting a steam mode;
paper rolling: and winding the dried electrolytic paper into a paper roll with a specified size, and packaging.
Wherein, papermaking: papermaking with a low concentration of 0.1-0.3% through a wire part, papermaking with a round wire for low-density electrolytic paper, papermaking with a long wire for high-density electrolytic paper, and compounding the electrolytic paper with the round wire and the long wire. The electrolyte paper obtained by the design has good immersion effect, can shorten the soaking time of the electrolyte and improve the soaking penetration degree of the core 1.
The pressure-resistant promotion additive originally designed is characterized in that: the high molecular polymer ethylene glycol solution is formed by polymerizing a plurality of organic matters including organic solute, solvent and the like at a high temperature of more than 120 +/-5 ℃ for more than 12 +/-0.5 hours, the withstand voltage bearing capacity of the electrolyte can be improved to more than 650V for a long time, and the whole voltage bearing capacity can reach more than 650V when the high molecular polymer ethylene glycol solution is used in an aluminum electrolytic capacitor;
additive formula proportion example:
note: the formulations in the above tables are in kg by mass.
The preparation method comprises the following steps: in three different embodiments, the materials with the serial number 1 and the serial number 2 are mixed and stirred in a container, the temperature is raised to 80 +/-5 ℃, the temperature is kept for 30 +/-5 minutes, the materials with the serial number 3 and the serial number 4 are added and mixed and stirred, the temperature is raised to 100 +/-5 ℃, the temperature is kept for 30 +/-5 minutes, the materials with the serial number 5 are added and mixed and stirred, the temperature is raised to 120 +/-5 ℃, the temperature is kept for 12 +/-0.5 hours, and the temperature is lowered to below 60 ℃ to complete the preparation.
Comparison of additive Properties
| Additive agent | Manufacturer(s) | Withstand voltage (V) | Electrolyte voltage with 5% of |
| Additive | |||
| 1 | Self-made | ≥1000 | |
| Additive | |||
| 2 | Self-made | ≥1000 | |
| Additive | |||
| 3 | Self-made | ≥1000 | 55V |
The following tests confirm that: additive 3 works best.
The preparation method is carried out in a high-temperature high-pressure reaction kettle, one step of the preparation process of the electrolyte is to keep the materials with lower boiling points in a gas state at high temperature, and the materials in a liquid state can be stirred uniformly and reacted only by the high-pressure kettle when the air pressure reaches 8-15 atmospheric pressures at about 160 ℃, in addition, the reaction is to esterify a plurality of organic acids and organic alcohols, the effect is better at high temperature, and the prepared electrolyte has high pressure resistance and high stability.
The formula proportion of the embodiment in the ultrahigh-voltage electrolyte 3 is shown in the table:
note: the formulations in the above tables are in kg by mass.
Firstly, the additive is prepared through the steps, the additive 3 is obtained with the best effect, and then the additive 3 is used as a raw material in the preparation of the electrolyte in the next procedure, wherein the preparation process of the electrolyte comprises the following steps:
in the table of the formulations of the examples of the electrolyte solution described above,
firstly, materials No. 1 and No. 2 are mixed in a container, heated to 160 +/-10 ℃ (the air pressure reaches about 8-15 atmospheric pressures), kept for 3 +/-0.5 hours, and cooled to the normal temperature and pressure state;
secondly, after the materials with the sequence number 3 are continuously added, the reaction is carried out for 30 plus or minus 5 minutes;
thirdly, continuously adding the material with the sequence number 4, and heating to 80 +/-5 ℃;
fourthly, continuously adding materials with the serial number of 5 to 9, heating to 150 +/-10 ℃, preserving the heat for 90 +/-5 minutes, and cooling to 110 +/-5 ℃;
fifthly, continuously adding the materials with the serial number of 10, preserving the heat for 10 +/-3 minutes, and cooling to 90 +/-5 ℃;
sixthly, continuously adding the material with the serial number of 11, preserving the heat for 10 +/-3 minutes, and cooling to below 60 ℃ for use.
The preparation process of the electrolyte is also very critical, and has great influence on the stability of the electrolyte, the ultrahigh voltage bearing capacity and the electrolyte parameters and the performance of the ultrahigh voltage capacitor produced. The first and second steps must be carried out in a high-temperature high-pressure reaction kettle. Tests prove that the formula can achieve the ultralow temperature effect, but the formula 2 and the formula 3 have better effects.
The measured electrolyte parameters of the three examples are compared in the following table.
The electrolyte prepared by the formula of the three embodiments according to the same process has parameters meeting the target requirements, and the formula of the embodiment 3 is also optimal in comprehensive consideration because the electrolyte and the integral voltage resistance of the product are preferentially considered in the ultrahigh-voltage soldering lug aluminum electrolytic capacitor.
Initial lightning voltage: when the voltage resistance of the electrolyte is measured, the voltage displayed on the instrument when the surface of the test piece is in weak flash fire is measured;
maximum sparking voltage: when the withstand voltage of the electrolyte is measured, violent sparks appear on the surface of the test piece, the voltage fluctuation displayed by the measuring instrument reaches more than 20V, and the highest voltage at the moment is basically close to the limit voltage to which the electrolyte can rise.
After the formula is obtained, the technical effect obtained by the method provided by the invention is compared with test data:
1. standard comparison:
2. industry level comparison (test results):
by comparison with the prior art, it is concluded that: compared with domestic products of the same industry, the product of the invention has more obvious advantages, and compared with Japanese products of the same industry, the product performance and the service life are basically consistent.
The formation mode of the anode foil is different: in the aspect of anode foil formation, the components of the formation liquid are different, the formation of the ultrahigh-pressure anode foil is carried out by adopting pure boric acid formation liquid, the concentration of the formation liquid is about 3-5%, while the formation of the common anode foil is carried out by adopting organic acid (azelaic acid), and the proportion of the formation liquid is 5-10%.
The aging process is different:
the invention adopts a multi-pole aging mode, and the normal aging comprises the following steps: and (3) boosting the voltage at normal temperature (to a rated AV value), aging at high temperature for 5-8 hours (keeping the voltage at the rated AV value), confirming the aging effect, discharging and cooling.
The aging mode of the invention is as follows: and (3) boosting the pressure to about 90% of AV value at normal temperature, aging at high temperature for 2-4 hours, recovering the boosting pressure at normal temperature to about 95% of AV value, aging at high temperature for 2-4 hours, recovering the boosting pressure at normal temperature to 100% of AV value, then keeping at high temperature for 3-5 hours, discharging and cooling, confirming the effect, and terminating the aging. The purpose is as follows: on the ultrahigh-voltage large-size soldering lug product, the ultrahigh-voltage product is aged for multiple times in a segmented manner, so that the one-time qualified rate, the stability, the reliability and the quality of the product can be ensured to the maximum extent.
It is to be understood that the present invention has been described with reference to certain embodiments, and that various changes in the features and embodiments, or equivalent substitutions may be made therein by those skilled in the art without departing from the spirit and scope of the invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from the essential scope thereof. Therefore, it is intended that the invention not be limited to the particular embodiment disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.
Claims (13)
1. A preparation method of a high-voltage aluminum electrolytic capacitor is characterized by comprising the following steps:
material slitting: cutting the raw material to reach the specified size of the capacitor;
riveting and rolling: rolling the cut raw materials into a core of the capacitor on a riveting and rolling machine;
and (3) drying: drying the rolled core;
impregnation: soaking the dried core in liquid electrolyte;
assembling and sealing: adding materials such as an aluminum shell and a cover plate to the impregnated core, riveting positive and negative electrode foil strips of the core with a positive electrode leading-out terminal and a negative electrode leading-out terminal led out from the cover plate respectively, then, introducing a crimping machine, sealing and forming, and isolating a sealed space formed inside the capacitor from the outside;
sleeving: sleeving a plastic sleeve on the capacitor formed by sealing;
and (3) aging: applying rated DC voltage and current to the completed product in special equipment to repair the damaged alumina layer of the anode foil in the capacitor at specified temperature for specified time;
a sorting step: and (3) performing 100% full inspection on the electrical property of the aged capacitor, and rejecting products with abnormal performance.
2. The method for preparing the high-voltage aluminum electrolytic capacitor according to claim 1, wherein the material slitting step comprises the following steps: the anode foil is electrochemically etched by using 0.5-10.0% of inorganic acid to form etching holes with a diameter of 1.0-2.0 μm.
3. The method for preparing the high-voltage aluminum electrolytic capacitor according to claim 1, wherein the material slitting step comprises the following steps: the anode aluminum foil and the cathode aluminum foil are both corrosion foils which are obtained by corrosion with required specific volume, and the formation foil is prepared by growing an oxide film after the corrosion foils are formed;
the formation main material is boric acid water solution, and an alumina protective film which can resist high pressure, has a compact structure and is uniform is formed through multi-stage formation under the temperature condition of the formation liquid.
4. The method for manufacturing a high-voltage aluminum electrolytic capacitor according to claim 3, wherein the material slitting step comprises: the temperature of the formation liquid is 85-95 ℃, and the multi-stage formation grade is 5-7.
5. The method for manufacturing a high-voltage aluminum electrolytic capacitor according to claim 1, wherein the impregnation step comprises: the electrolyte contains an additive which is added into the electrolyte,
the additive comprises the following ingredients in parts by weight: 40-50 parts of ethylene glycol, 10-20 parts of water, 15-25 parts of diethylene glycol, 10-20 parts of polyethylene glycol, 5-10 parts of polyvinyl alcohol and 10-20 parts of boric acid;
the preparation steps of the additive are as follows:
adding 40-50 parts of ethylene glycol and 10-20 parts of water into a container, stirring, heating to 80 +/-5 ℃, and keeping the temperature for 30 +/-5 minutes;
then adding 15-25 parts of diethylene glycol, 10-20 parts of polyethylene glycol and 5-10 parts of polyvinyl alcohol, stirring, heating to 100 +/-5 ℃, preserving heat for 30 +/-5 minutes,
and finally, adding 10-20 parts of boric acid into the container, stirring, heating to 120 +/-5 ℃, preserving heat for 12 +/-0.5 hours, and cooling to below 60 ℃.
6. The method for manufacturing a high-voltage aluminum electrolytic capacitor according to claim 1, wherein the impregnation step comprises: the electrolyte contains an additive which is added into the electrolyte,
the additive comprises the following ingredients in parts by weight: 40-50 parts of ethylene glycol, 15-30 parts of water, 15-25 parts of glycerol, 10-20 parts of polyvinyl alcohol and 10-20 parts of sebacic acid;
adding 40-50 parts of ethylene glycol and 10-20 parts of water into a container, stirring, heating to 80 +/-5 ℃, and keeping the temperature for 30 +/-5 minutes;
then adding 15-25 parts of glycerol and 10-20 parts of polyvinyl alcohol, stirring, heating to 100 +/-5 ℃, preserving heat for 30 +/-5 minutes,
and finally, adding 10-20 parts of sebacic acid into the container, stirring, heating to 120 +/-5 ℃, preserving heat for 12 +/-0.5 hours, and cooling to below 60 ℃.
7. The method for manufacturing a high-voltage aluminum electrolytic capacitor according to claim 1, wherein the impregnation step comprises: the electrolyte contains an additive which is added into the electrolyte,
the additive comprises the following ingredients in parts by weight: 40-50 parts of ethylene glycol, 20-30 parts of water, 15-25 parts of mannitol, 10-20 parts of polyvinyl alcohol and 10-20 parts of octadecenedioic and octadecanoic diacid;
adding 40-50 parts of ethylene glycol and 10-20 parts of water into a container, stirring, heating to 80 +/-5 ℃, and keeping the temperature for 30 +/-5 minutes;
then adding 15-25 parts of mannitol and 10-20 parts of polyvinyl alcohol, stirring, heating to 100 +/-5 ℃, preserving heat for 30 +/-5 minutes,
and finally, adding 10-20 parts of the carbendazim octadecadioic acid into the container, heating to 120 +/-5 ℃, preserving the heat for 12 +/-0.5 hours, and cooling to below 60 ℃.
8. The method for manufacturing a high-voltage aluminum electrolytic capacitor according to claim 1, wherein the impregnation step comprises: the electrolyte comprises the following ingredients in parts by weight: 5-10 parts of triethylamine, 5-10 parts of diethyl carbonate, 5-10 parts of benzoic acid, 40-50 parts of ethylene glycol, 10-20 parts of ammonium dodecanedioate, 8-15 parts of ammonium sebacate, 1-3 parts of ammonium pentaborate, 5-15 parts of an additive, 0.5-1 part of phosphoric acid, 0.5-2.5 parts of p-nitrobenzoic acid and 5-15 parts of a nano silicon dioxide EG solution;
the electrolyte is prepared by the following steps:
mixing 5-10 parts of triethylamine and 5-10 parts of diethyl carbonate in a container, heating to 160 +/-10 ℃, keeping the temperature for 3 +/-0.5 hours, cooling to normal temperature and normal pressure,
adding 5-10 parts of benzoic acid to react for 30 +/-5 minutes,
adding 40-50 parts of ethylene glycol, heating to 80 +/-5 ℃,
adding 10-20 parts of ammonium dodecanedioate, 8-15 parts of ammonium sebacate, 1-3 parts of ammonium pentaborate, 5-15 parts of additive and 0.5-1 part of phosphoric acid, heating to 150 +/-10 ℃, preserving heat for 90 +/-5 minutes, and cooling to 110 +/-5 ℃;
adding 0.5-2.5 parts of p-nitrobenzoic acid, preserving the heat for 10 +/-3 minutes, and cooling to 90 +/-5 ℃;
adding 5-15 parts of nano silicon dioxide EG solution, preserving the temperature for 10 +/-3 minutes, and cooling to below 60 ℃ for use.
9. The method for manufacturing a high-voltage aluminum electrolytic capacitor according to claim 1, wherein the impregnation step comprises: the electrolyte comprises the following ingredients in parts by weight: 5-10 parts of trimethylamine, 3-5 parts of diethyl carbonate, 3-5 parts of ethyl methyl carbonate, 5-15 parts of sebacic acid, 40-50 parts of ethylene glycol, 10-20 parts of ammonium dodecanedioate, 8-15 parts of ammonium sebacate, 1-3 parts of ammonium pentaborate, 5-15 parts of additives, 0.5-1 part of monobutyl phosphate, 0.5-2.5 parts of p-nitrobenzyl alcohol and 5-15 parts of nano silicon dioxide EG solution;
the electrolyte is prepared by the following steps:
mixing 5-10 parts of trimethylamine, 3-5 parts of diethyl carbonate and 3-5 parts of methyl ethyl carbonate in a container, heating to 160 +/-10 ℃, keeping the temperature for 3 +/-0.5 hours when the air pressure reaches 8-15 atmospheres, cooling to normal temperature and normal pressure,
adding 5-15 parts of sebacic acid to react for 30 +/-5 minutes,
adding 40-50 parts of ethylene glycol, heating to 80 +/-5 ℃,
adding 10-20 parts of ammonium dodecanedioate, 8-15 parts of ammonium sebacate, 1-3 parts of ammonium pentaborate, 5-15 parts of additive and 0.5-1 part of monobutyl phosphate, heating to 150 +/-10 ℃, preserving heat for 90 +/-5 minutes, and cooling to 110 +/-5 ℃;
adding 0.5-2.5 parts of p-nitrobenzol, preserving the heat for 10 +/-3 minutes, and cooling to 90 +/-5 ℃;
adding 5-15 parts of nano silicon dioxide EG solution, preserving the temperature for 10 +/-3 minutes, and cooling to below 60 ℃ for use.
10. The method for manufacturing a high-voltage aluminum electrolytic capacitor according to claim 1, wherein the impregnation step comprises: the electrolyte comprises the following ingredients in parts by weight:
5-10 parts of triethanolamine, 5-10 parts of methyl ethyl carbonate, 5-15 parts of dodecanedioic acid, 40-50 parts of ethylene glycol, 10-20 parts of ammonium dodecanedioate, 8-15 parts of ammonium sebacate, 1-3 parts of ammonium pentaborate, 5-15 parts of an additive, 0.5-1 part of butyl phosphate, 0.5-2.5 parts of p-nitroanisole and 5-15 parts of a nano silicon dioxide EG solution;
the electrolyte is prepared by the following steps:
mixing 5-10 parts of triethanolamine and 5-10 parts of methyl ethyl carbonate in a container, heating to 160 +/-10 ℃, keeping the temperature for 3 +/-0.5 hours until the air pressure reaches 8-15 atmospheric pressures, cooling to normal temperature and normal pressure,
adding 10-20 parts of ammonium dodecanedioic acid for reaction for 30 +/-5 minutes,
adding 40-50 parts of ethylene glycol, heating to 80 +/-5 ℃,
adding 0-20 parts of ammonium dodecanedioate, 8-15 parts of ammonium sebacate, 1-3 parts of ammonium pentaborate, 5-15 parts of additive and 0.5-1 part of butyl phosphate, heating to 150 +/-10 ℃, keeping the temperature for 90 +/-5 minutes, and cooling to 110 +/-5 ℃;
adding 0.5-2.5 parts of p-nitroanisole, preserving the heat for 10 +/-3 minutes, and cooling to 90 +/-5 ℃;
adding 5-15 parts of nano silicon dioxide EG solution, preserving the temperature for 10 +/-3 minutes, and cooling to below 60 ℃ for use.
11. The method for preparing the high-voltage aluminum electrolytic capacitor according to claim 1, wherein the electrolytic paper contained in the raw material is subjected to multi-stage purification and cylinder mould manufacturing processes, and the steps are as follows:
refining and purifying: carrying out multi-stage purification on the electrolytic paper raw material;
pulping: breaking up raw materials of the electrolytic paper, grinding and branching to make the paper pulp have more binding force;
papermaking: the electrolytic paper is made by long net or round net, and is compounded;
and (3) drying: removing part of water by adopting a narrowing mode, and drying the electrolytic paper by adopting a steam mode;
paper rolling: and winding the dried electrolytic paper into a paper roll with a specified size, and packaging.
12. The method for preparing a high-voltage aluminum electrolytic capacitor according to claim 11, wherein the papermaking: papermaking with a low concentration of 0.1-0.3% through a wire part, papermaking with a round wire for low-density electrolytic paper, papermaking with a long wire for high-density electrolytic paper, and compounding the electrolytic paper with the round wire and the long wire.
13. A capacitor made by the method of making a high voltage aluminum electrolytic capacitor of claims 1-12, comprising: the electrolytic paper is characterized in that a core is formed by sequentially overlapping and rolling a cathode foil, electrolytic paper and an anode foil, an aluminum shell is sleeved outside the core, a cover plate is connected with an opening of the aluminum shell, a sleeve is sleeved outside the aluminum shell, and a positive leading-out terminal and a negative leading-out terminal are led out of the core and penetrate out of the cover plate.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011432828.6A CN112670089B (en) | 2020-12-09 | 2020-12-09 | High-voltage aluminum electrolytic capacitor and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011432828.6A CN112670089B (en) | 2020-12-09 | 2020-12-09 | High-voltage aluminum electrolytic capacitor and preparation method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112670089A true CN112670089A (en) | 2021-04-16 |
| CN112670089B CN112670089B (en) | 2022-09-27 |
Family
ID=75401685
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011432828.6A Active CN112670089B (en) | 2020-12-09 | 2020-12-09 | High-voltage aluminum electrolytic capacitor and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112670089B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113327770A (en) * | 2021-07-19 | 2021-08-31 | 南通江海电容器股份有限公司 | Working electrolyte of low-voltage electrolytic capacitor for high-temperature working and preparation method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109192509A (en) * | 2018-07-10 | 2019-01-11 | 肇庆绿宝石电子科技股份有限公司 | A kind of aluminium electrolutic capacitor and its manufacturing method in 600V high pressure high temperature resistance and long service life |
| CN109616327A (en) * | 2018-12-19 | 2019-04-12 | 横店集团东磁有限公司 | A kind of aluminium electrolutic capacitor and its manufacturing method |
| CN110168685A (en) * | 2017-01-20 | 2019-08-23 | 日本高度纸工业株式会社 | Aluminium electrolutic capacitor separator and aluminium electrolutic capacitor |
| CN111029153A (en) * | 2019-12-13 | 2020-04-17 | 珠海格力新元电子有限公司 | Electrolyte for ultralow-temperature aluminum electrolytic capacitor and preparation method thereof |
-
2020
- 2020-12-09 CN CN202011432828.6A patent/CN112670089B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110168685A (en) * | 2017-01-20 | 2019-08-23 | 日本高度纸工业株式会社 | Aluminium electrolutic capacitor separator and aluminium electrolutic capacitor |
| CN109192509A (en) * | 2018-07-10 | 2019-01-11 | 肇庆绿宝石电子科技股份有限公司 | A kind of aluminium electrolutic capacitor and its manufacturing method in 600V high pressure high temperature resistance and long service life |
| CN109616327A (en) * | 2018-12-19 | 2019-04-12 | 横店集团东磁有限公司 | A kind of aluminium electrolutic capacitor and its manufacturing method |
| CN111029153A (en) * | 2019-12-13 | 2020-04-17 | 珠海格力新元电子有限公司 | Electrolyte for ultralow-temperature aluminum electrolytic capacitor and preparation method thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113327770A (en) * | 2021-07-19 | 2021-08-31 | 南通江海电容器股份有限公司 | Working electrolyte of low-voltage electrolytic capacitor for high-temperature working and preparation method thereof |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112670089B (en) | 2022-09-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102646514B (en) | Novel aging technology of mesohigh voltage aluminum electrolytic capacitor | |
| CN109192509B (en) | 600V high-voltage high-temperature-resistant long-life aluminum electrolytic capacitor and manufacturing method thereof | |
| CN102779654B (en) | Manufacture method of solid electrolyte aluminum electrolytic capacitor | |
| CN109616327B (en) | Aluminum electrolytic capacitor and manufacturing method thereof | |
| CN108648913B (en) | Solid-state aluminum electrolytic capacitor | |
| CN101483101A (en) | 125 DEG C high temperature long life aluminum electrolysis capacitor, production method thereof and special electrolysis liquid | |
| CN112670089B (en) | High-voltage aluminum electrolytic capacitor and preparation method thereof | |
| WO2020073189A1 (en) | Hybrid aluminum electrolytic capacitor and manufacturing method therefor | |
| CN109935468A (en) | A kind of ultralow temperature high voltage patch type aluminum capacitor electrolyte and preparation method thereof | |
| CN111640578A (en) | Working electrolyte of aluminum electrolytic capacitor for LED and preparation method thereof | |
| CN102983007A (en) | Novel nano aluminum electrolytic capacitor | |
| CN111403178B (en) | Ultra-wide temperature range high-voltage-resistant aluminum electrolytic capacitor | |
| CN111403177B (en) | Manufacturing method of ultra-wide temperature range high-voltage-resistant aluminum electrolytic capacitor | |
| CN111627711A (en) | Working electrolyte of aluminum electrolytic capacitor with voltage lower than 63V | |
| CN108777233A (en) | Chip polymer stack aluminum capacitor | |
| CN108987115B (en) | Conductive high-molecular aluminum electrolytic capacitor led out by guide foil | |
| CN113113233A (en) | Solid-liquid mixed winding type aluminum electrolytic capacitor and preparation method thereof | |
| CN208368360U (en) | Chip polymer stack aluminum capacitor | |
| CN100428380C (en) | Method for mfg. electrolytic capacitor | |
| CN105788865A (en) | Production technology of patch-type aluminum electrolytic capacitor | |
| CN113889343B (en) | Preparation method of high-energy solid aluminum electrolytic capacitor | |
| CN110993352A (en) | Aging method of aluminum electrolytic capacitor | |
| CN111403689A (en) | Baking method for oil-type negative electrode plate of lithium ion battery | |
| CN114005679B (en) | Aluminum electrolytic capacitor for gallium nitride charger and preparation method thereof | |
| CN218996506U (en) | SMD transformer framework for high voltage of new energy electric automobile |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |