CN116721874B - Glue-free fixed aluminum electrolytic capacitor and manufacturing method thereof - Google Patents
Glue-free fixed aluminum electrolytic capacitor and manufacturing method thereof Download PDFInfo
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- CN116721874B CN116721874B CN202310993820.4A CN202310993820A CN116721874B CN 116721874 B CN116721874 B CN 116721874B CN 202310993820 A CN202310993820 A CN 202310993820A CN 116721874 B CN116721874 B CN 116721874B
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- 239000003990 capacitor Substances 0.000 title claims abstract description 81
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 title claims abstract description 41
- 229910052782 aluminium Inorganic materials 0.000 title claims abstract description 41
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 12
- 239000003292 glue Substances 0.000 claims abstract description 31
- 238000007789 sealing Methods 0.000 claims abstract description 4
- 239000011888 foil Substances 0.000 claims description 34
- 238000004804 winding Methods 0.000 claims description 30
- 230000003014 reinforcing effect Effects 0.000 claims description 11
- 239000002390 adhesive tape Substances 0.000 claims description 8
- 238000009413 insulation Methods 0.000 claims description 7
- 239000003792 electrolyte Substances 0.000 claims description 5
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 239000000853 adhesive Substances 0.000 claims description 2
- 230000001070 adhesive effect Effects 0.000 claims description 2
- 239000000126 substance Substances 0.000 claims description 2
- 230000017525 heat dissipation Effects 0.000 abstract description 8
- 238000000034 method Methods 0.000 description 9
- 230000000052 comparative effect Effects 0.000 description 6
- 238000012360 testing method Methods 0.000 description 6
- 239000003795 chemical substances by application Substances 0.000 description 4
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000005011 phenolic resin Substances 0.000 description 3
- 229920001568 phenolic resin Polymers 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000000834 fixative Substances 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 239000003513 alkali Substances 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000035772 mutation Effects 0.000 description 1
- 230000001052 transient effect Effects 0.000 description 1
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
- H01G9/004—Details
- H01G9/08—Housing; Encapsulation
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
- H01G9/0003—Protection against electric or thermal overload; cooling arrangements; means for avoiding the formation of cathode films
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
- H01G9/004—Details
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
- H01G9/004—Details
- H01G9/008—Terminals
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
- H01G9/004—Details
- H01G9/04—Electrodes or formation of dielectric layers thereon
- H01G9/042—Electrodes or formation of dielectric layers thereon characterised by the material
- H01G9/045—Electrodes or formation of dielectric layers thereon characterised by the material based on aluminium
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01G—CAPACITORS; CAPACITORS, RECTIFIERS, DETECTORS, SWITCHING DEVICES, LIGHT-SENSITIVE OR TEMPERATURE-SENSITIVE DEVICES OF THE ELECTROLYTIC TYPE
- H01G9/00—Electrolytic capacitors, rectifiers, detectors, switching devices, light-sensitive or temperature-sensitive devices; Processes of their manufacture
- H01G9/145—Liquid electrolytic capacitors
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/13—Energy storage using capacitors
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- Fixed Capacitors And Capacitor Manufacturing Machines (AREA)
Abstract
The invention relates to the technical field of capacitors, and discloses an aluminum electrolytic capacitor fixed without glue and a manufacturing method thereof, wherein the aluminum electrolytic capacitor comprises the following components: the device comprises a shell, a core bag, a cover plate and a core bag self-locking device; the cover plate is arranged on the shell and used for sealing the shell; the cover plate is provided with a plurality of pressure valves; the cover plate is also provided with a positive terminal and a negative terminal; the core pack self-locking device is arranged in the shell, the core pack is loaded in the core pack self-locking device, and the core pack self-locking device is used for fixing the core pack in the shell. According to the invention, the core pack self-locking device is arranged in the shell of the capacitor, and the core pack is arranged in the self-locking device, so that the fixation of the core pack can be realized. According to the capacitor structure, the traditional mode of fixing the core package in the capacitor shell by using glue is replaced by the core package self-locking device, the problem that heat dissipation of the core package is not facilitated due to the fact that the core package is fixed by the glue can be avoided, and potential safety hazards of the capacitor are reduced.
Description
Technical Field
The invention relates to the technical field of capacitors, in particular to an aluminum electrolytic capacitor fixed without glue and a manufacturing method thereof.
Background
When the capacitor works, the inner core of the capacitor is prevented from shaking in the aluminum shell, and the serious conditions of changing the internal structure, generating parameter mutation and the like are avoided. In order to improve the vibration resistance of the capacitor, it is generally necessary to fix the core wrap with a fixing agent like glue.
The existing fixative is generally PP resin, and has the advantages of low odor, environmental protection, reusability, acid and alkali resistance, no reaction with electrolyte, low-temperature shrinkage and short curing time. However, traditional PP resin glue does not possess the heat conductivity, and the heat dissipation is not good, when the condenser during operation under high power load, there is ripple current to pass through, and the inside a large amount of heat that can produce of condenser, and the fixative can't export the heat, and the electrolyte in the aluminium shell can be promoted to continuous high temperature releases hydrogen to promote condenser internal pressure, not only can reduce the life of condenser, still have very big potential safety hazard.
Disclosure of Invention
The existing capacitor needs to fix the core package in the shell by using a fixing agent, however, the fixing of the core package by using the fixing agent has the problem that the heat dissipation of the core package is not facilitated, and potential safety hazard of the capacitor is easily caused; the invention aims to provide an aluminum electrolytic capacitor without glue fixing aiming at the problems, and the capacitor structure designed by the invention realizes the glue-free fixing structure of the capacitor.
The invention is realized by the following technical scheme:
an aluminum electrolytic capacitor fixed without glue, which is characterized by comprising: the device comprises a shell, a core bag, a cover plate and a core bag self-locking device; the cover plate is arranged on the shell and is used for sealing the shell; the cover plate is provided with a plurality of pressure valves; the cover plate is also provided with a positive terminal and a negative terminal; the core pack self-locking device is arranged in the shell, the core pack is loaded in the core pack self-locking device, and the core pack self-locking device is used for fixing the core pack in the shell.
According to the invention, the core pack self-locking device is arranged in the shell of the capacitor, and the core pack is arranged in the self-locking device, so that the fixation of the core pack can be realized. The self-locking device for the core package replaces the traditional mode of fixing the core package in the capacitor shell by using glue, and the capacitor structure designed by the invention can avoid the problem of being unfavorable for heat dissipation of the core package caused by fixing the core package by using the glue, thereby reducing the potential safety hazard of the capacitor.
Preferably, two pressure valves are arranged on the cover plate.
Specifically, because the capacitor is large in volume and high in capacity and the gas yield of the capacitor is high, the two pressure valves are arranged on the cover plate, so that the gas in the capacitor can be rapidly released under abnormal conditions, the explosion of the capacitor is avoided, and the safety is improved.
The structure designed by the invention can realize the glue-free fixing structure of a large-size capacitor (the diameter of the capacitor can reach 120 mm).
Further, an aluminum electrolytic capacitor without glue fixation: the inner wall of the shell is provided with a limiting ring for fixing the core pack self-locking device.
The two ends of the core bag self-locking device are respectively contacted with the bottom of the shell and the limiting ring, and the core bag self-locking device is fixed in the shell.
Further, an aluminum electrolytic capacitor without glue fixation: the core bag self-locking device is of a hollow cylindrical structure, the side wall of the core bag self-locking device is of an inward-bent arc shape, and a hollow cylindrical structure with a thin middle part and thick two ends is formed; the bottom of the shell is provided with an annular limiting groove matched with the end part of the core pack self-locking device; one end of the core bag self-locking device is arranged in the annular limiting groove, and the other end of the core bag self-locking device is propped against the limiting ring; the minimum diameter of the middle part of the core bag self-locking device with the hollow cylindrical structure is smaller than or equal to the diameter of the core bag.
Further, an aluminum electrolytic capacitor without glue fixation: a plurality of reinforcing ribs are arranged on one side, close to the core bag, of the cover plate; the stiffening ribs bear against the ends of the core pack after closing for increasing the stability of the core pack in the outer shell.
The invention adopts the same material (phenolic resin) as the cover plate by arranging the reinforcing rib on the back surface of the cover plate. The structural strength of the cover plate can be improved through the arranged reinforcing ribs; on the other hand, after the cover plate seals the shell, the reinforcing rib can be abutted against the end part of the core bag, so that the core bag can be prevented from shaking in the shell in the vertical direction.
Further, an aluminum electrolytic capacitor without glue fixation: insulation steps for increasing creepage distance between the terminals are arranged outside the positive electrode terminal and the negative electrode terminal; and a bulge is arranged on the insulation step arranged outside the positive terminal.
Specifically, phenolic resin is selected as a material of the insulating step. According to the invention, the creepage distance between the terminals is increased by arranging the insulation steps outside the positive electrode terminal and the negative electrode terminal, so that the sparking failure between the terminals is avoided. Through set up the arch on the insulating step outside the positive terminal, play the effect of mark, distinguish positive and negative terminal more easily, positive and negative pole will not be wrong.
Further, an aluminum electrolytic capacitor without glue fixation: a limiting protrusion is arranged at the bottom of the shell; the limiting protrusion abuts against the end part of the core pack and is used for improving the stability of the core pack in the shell. Specifically, the limiting protrusions can be arranged to be m-shaped protrusions. According to the invention, the limit effect on the vertical direction of the core package in the shell is achieved through the reinforcing ribs arranged on the cover plate and the limit protrusions arranged at the bottom of the shell, so that the core package is fixed.
A manufacturing method of an aluminum electrolytic capacitor without glue fixation is used for manufacturing the capacitor, and comprises the following steps:
s1, winding a negative electrode foil, electrolytic paper and a negative electrode lead-out strip to form a winding package A;
s2, after the diameter of the coiled package A reaches a value D, coiling positive foil, the electrolytic paper and a positive lead-out strip on the outer layer of the coiled package A to form a coiled package B;
s3, winding a fixing adhesive tape on the outer layer of the winding package B to obtain the core package;
s4, the core is soaked in electrolyte, then the positive electrode lead-out strip and the negative electrode lead-out strip are riveted with the positive electrode terminal and the negative electrode terminal respectively, then the core package is installed in the core package self-locking device, and the shell is sealed through the cover plate, so that the aluminum electrolytic capacitor without glue fixation is obtained.
Such core wrap winding process provided in the present invention: when the core package is just started to be wound, only the negative electrode foil, the electrolytic paper and the negative electrode lead-out strip are wound, the positive electrode foil is not wound, and the diameter of the first blank is up to a certain degree. The temperature of the central point is the highest when the capacitor core pack heats, and the central point is the relative center and is the position of the positive electrode foil coiling position of the core pack, and is the highest temperature. The positive foil is not rolled at first through the adjustment of the core-wrapping winding process, so that the looped position of the positive foil is far away from the center of the core-wrapping, the temperature of the center of the core-wrapping can be reduced a little, and the looped position is far away from the center of the core-wrapping by increasing the number of empty winding turns of the core-wrapping, so that the temperature of the center of the core-wrapping in the working process can be reduced.
Further, a manufacturing method of the glue-free fixed aluminum electrolytic capacitor comprises the following steps: the thickness of the negative electrode foil in the step S1 is 45-55 mu m.
The preferred negative electrode foil of the present invention has a thickness of 45-55 μm and a specific volume of 45-55 μm, and the negative electrode foil has a smaller capacity fade and less heat generation after use than conventional negative electrode foils. While 45-55 μm thick anode foil has a smaller RC resistance than conventional anode foil. The cathode foil selected by the invention has larger thickness, larger contact area with the bottom aluminum shell in the cathode extending structure, and can more effectively conduct the temperature of the core package center to the external environment, thereby having fast heat dissipation and strong impact resistance.
Further, a method for knowing the aluminum electrolytic capacitor without glue fixation is as follows: s2, winding positive foil, electrolytic paper and a positive lead-out strip on the outer layer of the roll package A after the diameter of the roll package A reaches 20-30 mm to form a roll package B; wherein: the positive electrode foil is formed by chemical conversion foil.
Further, a manufacturing method of the glue-free fixed aluminum electrolytic capacitor comprises the following steps: the adhesive tape in the step S3 is PET adhesive tape.
Preferably, the PET adhesive tape selected by the invention has strong adhesive force and strong anti-rebound property, and even if the inside of the core bag breaks down, the core bag is not easy to scatter under the impact of transient high current and does not burn on fire.
The invention has the beneficial effects that:
(1) According to the glue-free fixed aluminum electrolytic capacitor, the horizontal fixation of the core package in the shell can be realized through the core package self-locking device, the vertical fixation of the core package can be realized through the reinforcing ribs arranged on the cover plate and the limit protrusions arranged at the bottom of the shell, the fixation of the core package in the horizontal and vertical directions of the capacitor shell is finally realized, the glue is not required to be used for fixation, and the glue-free fixed capacitor structure is realized.
(2) According to the invention, the creepage distance between the terminals is increased by arranging the insulation steps outside the positive electrode terminal and the negative electrode terminal, so that the sparking failure between the terminals is avoided, and the safety is improved.
(3) According to the winding process of the core package, only the anode foil, the electrolytic paper and the anode lead-out strip are wound when the core package is just started to wind, so that the core package is firstly wound to reach a certain diameter, and then the anode foil, the electrolytic paper and the anode lead-out strip are wound, so that the looped position of the anode foil can be far away from the center of the core package, the temperature of the center of the core package can be reduced, and the potential safety hazard of a capacitor is reduced.
(4) The side wall of the core bag self-locking device designed by the invention is of an inward-bending arc structure, so that a gap is reserved between the side wall of the core bag self-locking device and the inner wall of the shell, and the core bag is not contacted with the inner wall of the shell after being arranged in the self-locking device, thereby being beneficial to heat dissipation of the core bag.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a front view of a cover plate of an aluminum electrolytic capacitor without glue;
FIG. 2 is a back structure diagram of a cover plate in an aluminum electrolytic capacitor without glue fixation;
FIG. 3 is an assembly diagram of a self-locking device for a shell and a core package in an aluminum electrolytic capacitor without glue fixation;
fig. 4 is a block diagram of the bottom of the outer case in the aluminum electrolytic capacitor without glue fixation provided by the invention.
The marks in the figure: 1 shell, 2 apron, 3 core package self-locking device, 4 insulating steps, 1-1 spacing ring, 1-2 annular spacing groove, 1-3 spacing arch, 2-1 pressure valve, 2-2 positive terminal, 2-3 negative terminal, 2-4 stiffening rib, 4-1 arch.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. The following description of at least one exemplary embodiment is merely exemplary in nature and is in no way intended to limit the invention, its application, or uses. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
The utility model provides an aluminum electrolytic capacitor that no glue was fixed, its characterized in that, aluminum electrolytic capacitor include: the device comprises a shell 1, a core pack, a cover plate 2 and a core pack self-locking device 3; the cover plate 2 is arranged on the shell 1 and is used for closing the shell 1;
as shown in fig. 1, the cover plate 2 is provided with two pressure valves 2-1; the cover plate 2 is provided with a positive terminal 2-2 and a negative terminal 2-3; phenolic resin insulation steps 4 for increasing creepage distance between the terminals are further arranged outside the positive electrode terminal 2-2 and the negative electrode terminal 2-3, and cross-shaped bulges 4-1 are arranged on the insulation steps 4 arranged outside the positive electrode terminal 2-2;
as shown in fig. 2, a plurality of reinforcing ribs 2-4 are arranged on one side, close to the core bag, of the back surface of the cover plate 2; after the cover plate 2 seals the shell 1, the reinforcing ribs 2-4 are abutted against the end part of the core pack, so as to increase the stability of the core pack in the shell 1 and avoid shaking in the vertical direction;
as shown in fig. 3, the core pack self-locking device 3 is of a hollow cylindrical structure, the side wall of the core pack self-locking device 3 is in an inward-bending arc shape, a hollow cylindrical structure with a thin middle part and thick two ends is formed, and the minimum diameter of the middle thin part of the core pack self-locking device 3 of the hollow cylindrical structure is not larger than the diameter of the core pack;
the core package is arranged in the core package self-locking device 3, and the core package self-locking device 3 is used for fixing the core package therein to avoid shaking in the horizontal direction;
as shown in fig. 3-4, a limiting ring 1-1 for fixing the core pack self-locking device 3 is arranged on the inner wall of the shell 1; an annular limiting groove 1-2 is formed in the bottom of the shell 1; the core pack self-locking device 3 is arranged in the shell 1, one end of the core pack self-locking device 3 is arranged in the annular limiting groove 1-2, and the other end of the core pack self-locking device is abutted against the limiting ring 1-1, so that the core pack self-locking device 3 is fixed in the shell 1; then the core pack in the shell 1 can be fixed through the core pack self-locking device 3 without glue, so that the cost is saved, the heat dissipation of the core pack is facilitated, and the safety of the capacitor is improved;
as shown in fig. 4, a limiting protrusion 1-3 is arranged at the bottom of the shell 1; the limiting protrusion 1-3 is abutted against the end part of the core pack and used for increasing the stability of the core pack in the shell 1 and avoiding shaking of the core pack in the vertical direction in the shell 1.
According to the capacitor structure, the vertical direction of the core package in the shell 1 can be fixed through the reinforcing ribs 2-4 arranged on the cover plate 2 and the limit protrusions 1-3 (the m-shaped protrusions) arranged at the bottom of the shell 1, and then the horizontal direction of the core package is limited through the core package self-locking device 3, so that the horizontal and vertical direction of the core package in the capacitor shell 1 is fixed finally, glue is not needed, and the capacitor structure with large volume and no glue is fixed is realized.
The invention also provides a manufacturing method of the glue-free fixed aluminum electrolytic capacitor, which comprises the following steps: the manufacturing method is specifically aimed at providing a winding process of the core pack;
s1, firstly winding a negative electrode foil with the thickness of 50 mu m, electrolytic paper and a negative electrode lead-out strip to form a winding package A;
s2, after the winding diameter of the winding package A reaches a value D (25 mm), winding positive foil, the electrolytic paper and a positive lead-out strip on the outer layer of the winding package A to form a winding package B;
s3, winding a PET adhesive tape for fixing on the outer layer of the winding package B to obtain the core package;
s4, immersing the core in electrolyte, riveting the positive electrode lead-out strip and the negative electrode lead-out strip with the positive electrode terminal 2-2 and the negative electrode terminal 2-3 respectively, installing the core package in the core package self-locking device 3, and sealing the shell 1 through the cover plate 2 to obtain the glue-free fixed aluminum electrolytic capacitor.
In the above method for manufacturing the aluminum electrolytic capacitor fixed without glue, the important point is the winding process of the core package, and by adjusting the winding process, only the negative electrode foil, the electrolytic paper and the negative electrode lead-out strip are wound when the core package is just started to wind, and the positive electrode foil is not wound, so that the core package is firstly wound to reach a certain diameter, and then the positive electrode foil, the electrolytic paper and the positive electrode lead-out strip are wound, and the looped position of the positive electrode foil can be finally far away from the center of the core package, so that the temperature of the center of the core package can be reduced, and the potential safety hazard of the capacitor is reduced.
Example 2
Example 2 differs from example 1 in that: the thickness of the negative electrode foil in example 2 was 45 μm, and the winding diameter of the roll A in example 2 was 30mm; the remainder was the same as in example 1.
Example 3
Example 3 differs from example 1 in that: the thickness of the negative electrode foil in example 3 was 55. Mu.m, and the winding diameter of the roll A in example 3 was 20mm; the remainder was the same as in example 1.
Comparative example 1
Comparative example 1 differs from example 1 in that: comparative example 1 the core pack in the outer shell was fixed with a fixing agent, and the rest was the same as in example 1.
And (3) testing:
(1) Vibration experiment: an ES-20-320 vibrating table is selected, an aluminum electrolytic capacitor which is designed in the embodiment 1 and is fixed without glue is clamped on the vibrating table, the frequency is set to be 10-55 Hz, the vibration amplitude is 0.75mm, and each vibration is carried out for 2 hours in the X, Y and Z axis directions; as a result, the glue-free fixed aluminum electrolytic capacitor designed by the invention has stable structure and no shaking of the core bag in the shell.
(2) Temperature rise test: temperature rise test experiments were performed on the capacitors obtained in example 1 and comparative example 1, specifically: the capacitors of example 1 and comparative example 1 were applied with a rated ripple direct current voltage of 400V at 40 ℃, 60 ℃ and 85 ℃ respectively, the voltage was applied for 6 hours, and then the temperature of the capacitors after the voltage was applied was tested;
the results show that: the capacitor provided in example 1 had a capacitor temperature rise of 22.416 ℃, 11.567 ℃ and 1.887 ℃ respectively after a 400V rated ripple dc voltage was applied for 6 hours under test conditions of 40 ℃, 60 ℃ and 85 ℃;
the capacitor provided in comparative example 1 had capacitor temperatures increased by 30.598 deg.C, 18.853 deg.C and 4.561 deg.C, respectively, after application of 400V rated ripple DC voltage for 6 hours under test conditions of 40 deg.C, 60 deg.C and 85 deg.C.
The temperature rise test can show that the capacitor designed by the invention can effectively improve the heat dissipation problem of the capacitor, thereby improving the safety performance of the capacitor.
The above-described preferred embodiments of the present invention are only for illustrating the present invention, and are not to be construed as limiting the present invention. Obvious changes and modifications of the invention, which are introduced by the technical solution of the present invention, are still within the scope of the present invention.
Claims (7)
1. An aluminum electrolytic capacitor fixed without glue, which is characterized by comprising: the device comprises a shell (1), a core bag, a cover plate (2) and a core bag self-locking device (3);
the cover plate (2) is arranged on the shell (1) and is used for sealing the shell (1);
a plurality of pressure valves (2-1) are arranged on the cover plate (2); the cover plate (2) is also provided with a positive terminal (2-2) and a negative terminal (2-3);
the core pack self-locking device (3) is arranged in the shell (1), the core pack is loaded in the core pack self-locking device (3), and the core pack self-locking device (3) is used for fixing the core pack in the shell (1); the inner wall of the shell (1) is provided with a limiting ring (1-1) for fixing the core-package self-locking device (3);
the core bag self-locking device (3) is of a hollow cylindrical structure, and the side wall of the core bag self-locking device (3) is in an inward bent arc shape to form a hollow cylindrical structure with a thin middle part and thick two ends; an annular limiting groove (1-2) matched with the end part of the core pack self-locking device (3) is formed in the bottom of the shell (1); one end of the core pack self-locking device (3) is arranged in the annular limiting groove (1-2), and the other end of the core pack self-locking device is propped against the limiting ring (1-1); the minimum diameter of the middle part of the core bag self-locking device (3) with the hollow cylindrical structure is smaller than or equal to the diameter of the core bag;
the manufacturing method of the glue-free fixed aluminum electrolytic capacitor comprises the following steps:
s1, winding a negative electrode foil, electrolytic paper and a negative electrode lead-out strip to form a winding package A;
s2, after the diameter of the coiled package A reaches a value D, coiling positive foil, the electrolytic paper and a positive lead-out strip on the outer layer of the coiled package A to form a coiled package B;
s3, winding a fixing adhesive tape on the outer layer of the winding package B to obtain the core package;
s4, the core is soaked in electrolyte, then the positive electrode lead-out strip and the negative electrode lead-out strip are riveted with the positive electrode terminal (2-2) and the negative electrode terminal (2-3) respectively, then the core package is installed in the core package self-locking device (3), and the shell (1) is sealed through the cover plate (2), so that the aluminum electrolytic capacitor fixed without glue is obtained.
2. The glue-free fixed aluminum electrolytic capacitor according to claim 1, wherein a plurality of reinforcing ribs (2-4) are arranged on one side of the cover plate (2) close to the core bag; the reinforcing ribs (2-4) bear against the ends of the core pack after closing.
3. The glue-free fixed aluminum electrolytic capacitor according to claim 1, wherein the outside of the positive terminal (2-2) and the negative terminal (2-3) are provided with insulating steps (4) for increasing creepage distance between the terminals;
the insulation step (4) arranged outside the positive terminal (2-2) is provided with a bulge (4-1).
4. The glue-free fixed aluminum electrolytic capacitor according to claim 1, wherein a limiting protrusion (1-3) is arranged at the bottom of the housing (1); the limiting bulge (1-3) is abutted against the end part of the core bag.
5. The glue-free fixed aluminum electrolytic capacitor as claimed in claim 1, wherein the thickness of the negative electrode foil in the step S1 is 45-55 μm.
6. The glue-free fixed aluminum electrolytic capacitor according to claim 1, wherein in the step S2, after the diameter of the winding A reaches 20-30 mm, the positive electrode foil, the electrolytic paper and the positive electrode lead-out strip are wound on the outer layer of the winding A to form a winding B; wherein: the positive electrode foil is formed by chemical conversion foil.
7. The aluminum electrolytic capacitor with no adhesive fixation as recited in claim 1, wherein the adhesive tape in the step S3 is a PET adhesive tape.
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| CN202310993820.4A CN116721874B (en) | 2023-08-09 | 2023-08-09 | Glue-free fixed aluminum electrolytic capacitor and manufacturing method thereof |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2395374Y (en) * | 1999-11-05 | 2000-09-06 | 尤勇 | Super fine box type capacitor non-glued outer case |
| CN210865935U (en) * | 2019-12-31 | 2020-06-26 | 深圳市凯达新电子有限公司 | Sealed anti-seismic electrolytic capacitor |
| CN218160008U (en) * | 2022-06-20 | 2022-12-27 | 宁波碧彩实业有限公司 | High-voltage capacitor's insulator arrangement |
-
2023
- 2023-08-09 CN CN202310993820.4A patent/CN116721874B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2395374Y (en) * | 1999-11-05 | 2000-09-06 | 尤勇 | Super fine box type capacitor non-glued outer case |
| CN210865935U (en) * | 2019-12-31 | 2020-06-26 | 深圳市凯达新电子有限公司 | Sealed anti-seismic electrolytic capacitor |
| CN218160008U (en) * | 2022-06-20 | 2022-12-27 | 宁波碧彩实业有限公司 | High-voltage capacitor's insulator arrangement |
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| CN116721874A (en) | 2023-09-08 |
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