WO2023246087A1

WO2023246087A1 - Aluminum electrolytic capacitor and manufacturing method therefor

Info

Publication number: WO2023246087A1
Application number: PCT/CN2023/072155
Authority: WO
Inventors: 余英凤; 黄兴高; 王洁; 朱艳浩; 韩亮
Original assignee: 中兴通讯股份有限公司
Priority date: 2022-06-23
Filing date: 2023-01-13
Publication date: 2023-12-28
Also published as: CN117334474A

Abstract

Embodiments of the present disclosure relate to the technical field of electrolytic capacitors, and provide an aluminum electrolytic capacitor and a manufacturing method therefor. The aluminum electrolytic capacitor comprises an aluminum housing, a heat conducting member, and an electrolysis assembly, wherein the aluminum housing has an accommodating cavity provided with an opening in one end; the heat conducting member comprises a heat conducting column and at least one first heat transfer portion, and the heat conducting column extends from the open end to the bottom of the aluminum housing; all the first heat transfer portions are connected to the heat conducting column, extend from the heat conducting column towards the inner sidewall of the aluminum housing, and abut against the inner sidewall of the aluminum housing; the electrolysis assembly comprises a winding core formed by winding on the periphery of the heat conducting column; and the heat conducting member and the electrolysis assembly are both accommodated in the accommodating cavity.

Description

Aluminum electrolytic capacitor and manufacturing method thereof

Cross-references to related applications

This disclosure claims priority to Chinese patent application CN202210720149.1 titled "Aluminum Electrolytic Capacitor and Manufacturing Method Thereof" filed on June 23, 2022, the entire content of which is incorporated into this disclosure by reference.

Technical field

The present disclosure relates to the technical field of capacitors, and in particular, to an aluminum electrolytic capacitor and a manufacturing method thereof.

Background technique

Aluminum electrolytic capacitors are commonly used electronic components in electronic circuits and have an important impact on ensuring the performance of electronic circuits. With the development of 5G communication technology, higher requirements have been put forward for electronic circuit design, such as being able to work at temperatures above 85°C and having a service life of more than 10 years.

Contents of the invention

In a first aspect, embodiments of the present disclosure provide an aluminum electrolytic capacitor. The aluminum electrolytic capacitor includes: an aluminum shell having a receiving cavity with an opening at one end; a thermal conductive member including a thermal conductive column and at least one first heat transfer part, the thermal conductive column extending from the opening The end extends toward the bottom of the aluminum shell; all of the first heat transfer parts are connected to the thermal conductive columns, and extend from the thermal conductive columns in the direction of the inner wall of the aluminum shell, and are connected with the thermal conductive columns. The inner wall of the aluminum shell abuts; and an electrolytic component, the electrolytic component includes a core wound around the outer periphery of the thermal conductive column; both the thermal conductive member and the electrolytic component are accommodated in the accommodation cavity.

In a second aspect, embodiments of the present disclosure provide a manufacturing method of an aluminum electrolytic capacitor. The manufacturing method of the aluminum electrolytic capacitor includes: connecting the anode foil to the positive electrode terminal, and simultaneously connecting the cathode foil to the negative electrode terminal; in the Electrolytic paper is placed between the anode foil and the cathode foil, so that the anode foil and the cathode foil are separated by the electrolytic paper to obtain a rolled assembly; and a thermal conductive member including at least a thermal conductive column and a first heat transfer part is provided ; Wind the winding assembly around the thermal conductive column to obtain a winding core with the positive electrode lead-out terminal and the negative electrode lead-out terminal. The effective radius of the winding core is not greater than that of the first heat transfer part. length; place the roll core in the electrolyte for dipping treatment to obtain a semi-finished product; assemble the semi-finished product into an aluminum shell with an opening at one end, so that the first heat transfer part contacts the inner wall of the aluminum shell Connect; pass the positive electrode lead-out terminal and the negative electrode lead-out terminal through the sealing member, and insert the sealing member into the opening; and perform girdle sealing treatment on the aluminum shell to obtain an aluminum electrolytic capacitor.

Description of the drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings needed to be used in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are some embodiments of the present disclosure, which are of great significance to this field. Ordinary technicians can also obtain other drawings based on these drawings without exerting creative work.

Figure 1 is a schematic cross-sectional view of an aluminum electrolytic capacitor provided by an embodiment of the present disclosure;

Figure 2 is a simplified schematic diagram of the roll core spreading provided by an embodiment of the present disclosure;

Figure 3 is a schematic side view of a thermal conductive member provided by an embodiment of the present disclosure;

Figure 4 is a schematic side view of a thermal conductive member provided by another embodiment of the present disclosure;

Figure 5 is a three-dimensional structural view of a thermal conductive member provided by an embodiment of the present disclosure;

Figure 6 is a schematic side view of a thermal conductive member provided by another embodiment of the present disclosure;

Figure 7 is a schematic top view of a thermal conductive member installed on an aluminum shell according to an embodiment of the present disclosure;

Figure 8 is a schematic top view of a thermal conductive member installed on an aluminum shell according to another embodiment of the present disclosure;

Figure 9 is a schematic top view of four thermal conductive members installed in an aluminum shell according to yet another embodiment of the present disclosure; and

FIG. 10 is a schematic top view of four heat conductive members installed on an aluminum shell according to yet another embodiment of the present disclosure.

Explanation of reference numbers:

10. Aluminum electrolytic capacitor; 11. Aluminum shell; 110. Accommodation cavity; 1101. Opening; 111. Waistband; 12. Thermal conductive member; 121. Thermal conductive column; 12101. Second sector ring; 12102. Third sector shape; 122 , first heat transfer part; 1220, first sector; 123, second heat transfer part; 1230, second sector; 124, heat dissipation part; 13, electrolytic component; 131, core; 1311, anode foil; 1312, cathode Foil; 1313. Electrolytic paper; 132. Positive lead terminal; 133. Negative lead terminal; 14. Seal.

Detailed ways

The technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, rather than all of the embodiments. Based on the embodiments in this disclosure, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of this disclosure.

It should be understood that the terminology used in the description of the disclosure is for the purpose of describing particular embodiments only and is not intended to limit the disclosure. As used in this disclosure and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms unless the context clearly dictates otherwise.

The core of related aluminum electrolytic capacitors generates too much heat under high temperature and large ripple current load, which causes the temperature of the aluminum electrolytic capacitor to rise, the electrolyte to chemically react to produce water vapor, and eventually the core dries up or the internal pressure increases, resulting in aluminum Electrolytic capacitors fail within their useful life. Related technologies add heat dissipation structures to dissipate heat from aluminum electrolytic capacitors. However, the related heat dissipation solutions only dissipate heat from the outside of the winding core or the outside of the aluminum electrolytic capacitor, and cannot effectively dissipate heat from the inside of the winding core. According to the relevant heat dissipation scheme, an anatomical analysis of the failed aluminum electrolytic capacitor was found. It was found that the inside of the core was dry and the outer surface was wet. Therefore, a relevant heat dissipation scheme was adopted. If the temperature difference between the inside and outside of the winding core was too large, the aluminum electrolytic capacitor would still expire within its service life. Internal failure.

The aluminum electrolytic capacitor 10 and its components provided by embodiments of the present disclosure are shown in FIGS. 1 to 6 .

Referring to Figures 1, 2 and 3, the aluminum electrolytic capacitor 10 provided in this embodiment includes an aluminum shell 11, a heat conductive member 12 and an electrolytic component 13. Among them, the aluminum shell 11 has a receiving cavity 110, and an opening 1101 is provided at one end of the receiving cavity 110; the thermal conductive member 12 includes a thermal conductive column 121 and at least one first heat transfer part 122. The thermal conductive column 121 extends from the opening 1101 end to the aluminum shell 11. The bottom is extended, and all the first heat transfer parts 122 are connected to the heat conduction columns 121 , and all the first heat transfer parts 122 extend in the direction of the inner wall of the aluminum shell 11 and abut against the inner wall of the aluminum shell 11 ; The electrolytic component 13 includes a core 131 rolled around the periphery of the thermal conductive column 121. The thermal conductive member 12 and the electrolytic component 13 are both accommodated in the accommodation cavity 110. In the aluminum electrolytic capacitor 10 provided in this embodiment, on the one hand, the heat conduction column 121 of the heat conduction member 12 can transfer the heat generated in the center of the winding core 131 to the aluminum shell 11 through the first heat transfer part 122, thereby achieving internal control of the winding core 131. The effective conduction of heat can effectively dissipate the heat generated inside the core 131, so that the temperature difference between the inside and outside of the core 131 is small during use of the aluminum electrolytic capacitor 10, and the heat in each part is more balanced, thereby improving the efficiency of the core 131. The consistency of internal and external capacitance performance is ultimately beneficial to improving the service life of the aluminum electrolytic capacitor 10 large ripple current; on the other hand, the winding core 131 is wound around the periphery of the thermal conductive column 121, which fully utilizes the central space of the winding core 131 , so that the strength and compactness of the core 131 are effectively improved, and the mechanical strength of the core 131 assembled in the aluminum shell 11 is improved, without reducing the effective components used for electrolysis in the core 131, maintaining the aluminum electrolytic capacitor 10 capacity.

In the aluminum electrolytic capacitor 10 of the embodiment of the present disclosure, the thermal conductive member 12 has thermal conductivity and insulation properties, that is, it can conduct heat and be electrically insulated. In some embodiments, the thermally conductive member 12 may be thermally conductive silica gel. At the same time, because the thermally conductive silica gel also has a certain elasticity, it can be easily assembled. In some embodiments, the thermal conductivity of the thermal conductive member 12 is not less than 5.0 W/m·k, and the breakdown voltage is not less than 5.0 Kv/mm to effectively ensure the thermal insulation effect.

Please refer to Figures 1 and 2. The core 131 in the embodiment of the present disclosure includes an anode foil 1311, an electrolytic paper 1313 and a cathode foil 1312. The electrolytic paper 1313 is used to isolate the anode foil 1311 and the cathode foil 1312 to avoid the anode foil 1311 and cathode foil 1312 are short-circuited due to contact. Wind the anode foil 1311, electrolytic paper 1313 and cathode foil 1312 around the thermal conductive column 121 to obtain the core 131. In some embodiments, the aluminum electrolytic capacitor 10 further includes a sealing member 14, which is used to seal the aluminum shell 11, fill in the opening 1101, and girdle the aluminum shell 11, so that when the aluminum shell 11 is close to The opening 1101 forms a circumferential waist portion 111, so that the sealing member 14 is extruded and deformed to be fastened at the opening 1101, and the accommodation cavity 110 is isolated from the outside. In order to facilitate sealing, the sealing member 14 can be selected from a rubber material, which has both elasticity and insulating properties, and will not be corroded when in contact with the electrolyte. At the same time, the electrolytic assembly 13 also includes a positive lead terminal 132 and a negative lead terminal 133; wherein, the positive lead terminal 132 is used to connect the winding core 131 with the outside, thereby forming a positive terminal outside the aluminum electrolytic capacitor 10, and the negative lead terminal The terminal 133 is used to connect the winding core 131 with the outside, so that a negative terminal is formed outside the aluminum electrolytic capacitor 10 . The positive lead terminal 132 and the anode foil 1311 are connected and pass through the seal 14 to extend to the outside of the accommodation cavity 110 ; the negative lead terminal 133 and the cathode foil 1312 are connected and pass through the seal 14 to extend to the outside of the accommodation cavity 110 .

Referring to Figures 1, 3 and 5, in some embodiments, the first heat transfer part 122 is disposed between the winding core 131 and the inner bottom wall of the aluminum shell 11, and the first heat transfer part 122 is also abutted against The inner bottom wall of the aluminum shell 11. The location of the first heat transfer part 122 can make full use of the space between the roll core 131 and the inner bottom wall of the aluminum shell 11 so that the first heat transfer part 122 does not occupy the space of the aluminum shell 11 for accommodating the roll core 131 On the other hand, since the first heat transfer part 122 is also in contact with the inner wall of the aluminum shell 11, the first heat transfer part 122 can transfer the heat generated by the heat conduction column 121 to the side wall of the aluminum shell 11. , it is also transmitted to the bottom of the aluminum shell 11, so that it has a larger heat conduction area to further improve the evacuation effect of the heat generated inside the core 131; on the other hand, since the first heat transfer part 122 is attached to the aluminum The inner bottom wall of the shell 11 also functions as the winding core 131 and fixes the position of the winding core 131 , effectively improving the structural stability of the winding core 131 and also improving the structural reliability of the aluminum electrolytic capacitor 10 . In some embodiments, all the first heat transfer parts 122 are evenly distributed along the circumferential direction of the heat conduction column 121, that is, the angle between two adjacent first heat transfer parts 122 is the same, which is beneficial to The first heat transfer part 122 evenly transfers the heat from the thermal conductive column 121 to the aluminum shell 11 so that the side wall of the aluminum shell 11 receives the heat evenly. For example, when the number of the first heat transfer parts 122 is two, the two first heat transfer parts 122 are arranged on opposite sides of the heat conduction column 121 with the central axis of the heat conduction column 121 as the symmetry axis. The included angle between 122 is 180°; for example, when the number of first heat transfer parts 122 is three, the included angle between two adjacent first heat transfer parts 122 is 120°; when the first heat transfer part 122 When the number of the first heat transfer parts 122 is four, the angle between the two adjacent first heat transfer parts 122 is 90°; when the number of the first heat transfer parts 122 is six, the angle between the two adjacent first heat transfer parts 122 is 90°. The included angle between the heat transfer parts 122 is 60°, etc., which are not exhaustive here.

Please refer to FIG. 1 and FIG. 7 . In some embodiments, the orthographic projection of the first heat transfer part 122 on the inner bottom wall of the aluminum shell 11 is in the shape of a first sector 1220 , and the first sector 1220 is formed by a distance between two radii. The gradually increasing trend extends toward the direction of the inner wall of the aluminum shell 11 . The first heat transfer part 122 is designed to have such a structure that when the heat is transferred to the side wall of the aluminum shell 11 through the first heat transfer part 122, it has a larger contact area with the inner bottom wall of the aluminum shell 11. Therefore, it also has a larger heat conduction area, which can further improve the dissipation effect of heat inside the core 131 .

Please refer to Figure 1, Figure 4, and Figure 5. In some embodiments, the thermal conductive member 12 also includes at least one second heat transfer part 123. The second heat transfer part 123 is provided between the opening 1101 and the winding core 131, and all The second heat transfer parts 123 are all connected to the thermal conductive pillars 121 and extend from the thermal conductive pillars 121 in the direction of the inner wall of the aluminum shell 11 while abutting against the inner wall of the aluminum shell 11 . That is, the second heat transfer part 123 and the first The heat transfer parts 122 are respectively provided at opposite ends of the winding core 131 , that is, the second heat transfer part 123 and the first heat transfer part 122 are respectively provided at opposite ends of the heat conduction column 121 . Such a structural design allows the heat generated inside the core 131 to be conducted and evacuated along the thermal conductive columns 121 to the first heat transfer part 122 and also to the second heat transfer part 123 along the thermal conductive columns 121, and The heat evacuated through the second heat transfer part 123 is finally transferred to the aluminum shell 11 , which can further improve the heat dissipation efficiency inside the winding core 131 and improve the uniformity of heat dissipation of the aluminum electrolytic capacitor 10 so that the aluminum shell 11 is close to the opening 1101 The temperature at one end tends to be consistent with the temperature near the bottom of the aluminum shell 11 .

Please refer to FIGS. 1 , 7 and 8 . In some embodiments, the orthographic projection of the second heat transfer part 123 on the inner bottom wall of the aluminum shell 11 forms a second fan shape 1230 , and the second fan shape 1230 is formed between two radii. The distance between them gradually increases toward the inner wall of the aluminum shell 11 . The second heat transfer part 123 is designed in such a structure that the heat transferred from the center of the core 131 by the heat conduction column 121 can be transferred to the aluminum shell 11 . , has a larger transfer lateral area, making the heat transfer faster, which is more conducive to improving the evacuation effect of heat inside the core 131. In some embodiments, the second fan shape 1230 and the first fan shape 1220 overlap, so that the heat in the center of the winding core 131 can be evenly transferred to the aluminum shell 11, thereby achieving uniform heat dissipation, so that various parts of the aluminum shell 11 have a uniform temperature effect. .

Please refer to FIG. 1 , FIG. 5 , and FIG. 8 . In some embodiments, all the second heat transfer parts 123 are evenly distributed along the circumferential direction of the heat conduction column 121 , that is, between two adjacent second heat transfer parts 123 The angles formed between them are the same, which is conducive to the second heat transfer part 123 to uniformly transfer the heat of the thermal conductive column 121 to the aluminum shell 11, so that the side walls of the aluminum shell 11 receive heat evenly. For example, when the number of the second heat transfer parts 123 is two, the two second heat transfer parts 123 are arranged on opposite sides of the heat conduction column 121 with the central axis of the heat conduction column 121 as the symmetry axis. The included angle between 123 is 180°; for example, when the number of second heat transfer parts 123 is three, the included angle between two adjacent second heat transfer parts 123 is 120°; when the second heat transfer part 123 When the number of second heat transfer parts 123 is four, the angle between two adjacent second heat transfer parts 123 is 90°; when the number of second heat transfer parts 123 is six, the angle between two adjacent second heat transfer parts 123 is 90°. The included angle between the heat transfer parts 123 is 60°, etc., which are not exhaustive here.

Please refer to FIG. 1 and FIG. 6 . In some embodiments, the distance between the first heat transfer part 122 and the second heat transfer part 123 is greater than the height of the winding core 131 . The distance between the parts 123 is less than the height of the aluminum shell 11. On the one hand, it can effectively prevent the core 131 from being squeezed, deformed or even short-circuited by the first heat transfer part 122 and the second heat transfer part 123; on the other hand, it can make the heat conductive member 12 It can be assembled into the accommodation cavity 110 of the aluminum shell 11 without affecting the assembly of the aluminum electrolytic capacitor 10 . In some embodiments, the distance between the first heat transfer part 122 and the winding core 131 is between 0 and 2 mm. Similarly, the distance between the second heat transfer part 123 and the winding core 131 is between 0 and 2 mm. , so that the distance between the first heat transfer part 122 and the second heat transfer part 123 is greater than the height of the winding core 131 by 0 to 4 mm.

Please refer to Figures 1 and 6. In some embodiments, the heat conductive member 12 also includes a heat dissipation portion 124. The heat dissipation portion 124 is close to the inner wall of the aluminum shell 11 and extends from the opening 1101 end to the bottom of the aluminum shell 11. At the same time, The heat dissipation part 124 is connected to the first heat transfer part 122 and the second heat transfer part 123 respectively. By arranging the heat dissipation part 124 and abutting the heat dissipation part 124 against the inner wall of the aluminum shell 11 , the heat transferred from the first heat transfer part 122 to the bottom of the aluminum shell 11 can be transferred to the bottom of the aluminum shell 11 and the opening 1101 via the heat dissipation part 124 At the same time, the heat transferred from the second heat transfer part 123 to the part of the aluminum shell 11 close to the opening 1101 can be transferred to the part between the opening 1101 end of the aluminum shell 11 and the bottom of the aluminum shell 11 through the heat dissipation part 124 , to further improve the heat dissipation effect of the internal heat of the roll core 131, so that the heat received by each part of the aluminum shell 11 is more uniform. In addition, the design of the heat dissipation part 124 can also make the roll core 131 embedded in the heat dissipation part 124 and the heat conduction column. 121 and is fixed, and the heat dissipation part 124 plays a buffering role between the winding core 131 and the aluminum shell 11, so that the winding core 131 is not easily damaged, and also improves the structural stability, reliability and winding quality of the winding core 131. The density of the core 131. In some embodiments, the heat dissipation part 124 is arranged around the outer circumference of the winding core 131 and is close to the inner wall of the aluminum shell 11. At the same time, the heat dissipation part 124 is also connected to the first heat transfer part 122. The heat dissipation part 124 is designed like this The structure can improve the uniformity of heating of the parts near the bottom of the aluminum shell 11. In some alternative embodiments, the heat dissipation part 124 is arranged around the outer circumference of the winding core 131 , and the heat dissipation part 124 is close to the inner wall of the aluminum shell 11 . At this time, the heat dissipation part 124 is also connected to the second heat transfer part 123. Such a structural design can improve the heating uniformity of the aluminum shell 11 near the opening 1101, which is beneficial to improving the heat dissipation effect. In some alternative embodiments, the heat dissipation part 124 includes a first heat dissipation ring, a second heat dissipation ring and a uniform heat plate, wherein the first heat dissipation ring is provided on the outer periphery of the winding core 131 and is close to the inside of the aluminum shell 11 wall, at the same time, the first heat dissipation ring is also connected to the first heat transfer part 122; the second heat dissipation ring is arranged around the outer periphery of the winding core 131 and is close to the inner wall of the aluminum shell 11. At the same time, the second heat dissipation ring is also connected to the third heat dissipation ring. The two heat transfer parts 123 are connected; the uniform heat plate is close to the inner wall of the aluminum shell 11, and the uniform heat plate is connected between the first heat dissipation ring and the second heat dissipation ring. The heat dissipation part 124 is designed in such a structure that the roll The heat generated by the core 131 can be evenly transferred to the aluminum shell 11 , thereby improving the heat dissipation effect of the aluminum electrolytic capacitor 10 . In some embodiments, all heat dissipation parts 124 are also in close contact with the outer circumference of the winding core 131 , so that the heat between the center of the winding core 131 and the outer circumference of the winding core 131 can be effectively transferred, so that the heat inside and outside the winding core 131 can be effectively transferred. It tends to be balanced and improves the consistency of heat in various parts of the core 131.

In some embodiments, when the heat dissipation part 124 extends from the opening 1101 end to the bottom of the aluminum shell 11 , the heat dissipation part 124 is in surface contact with the inner side wall of the aluminum shell 11 , thereby effectively improving the relationship between the heat dissipation part 124 and the aluminum shell 11 contact area to improve heat dissipation. In some embodiments, the orthographic projection of the heat dissipation part 124 on the inner bottom wall of the aluminum shell 11 is a first fan ring, and the outer diameter of the first fan ring is the same as the inner diameter of the aluminum shell 11 . This can effectively improve the distance between the heat dissipation part 124 and the inner bottom wall of the aluminum shell 11 . The contact area of the aluminum shell 11. In some embodiments, when the heat dissipation part 124 is arranged around the outer circumference of the winding core 131 and abuts against the inner wall of the aluminum shell 11, the orthographic projection of the heat dissipation part 124 on the inner bottom wall of the aluminum shell 11 forms a first circular ring, And the outer diameter of the first ring is the same as the inner diameter of the aluminum shell 11 . In some embodiments, whether the heat dissipation part 124 extends from the opening 1101 end to the bottom of the aluminum shell 11 or is arranged around the outer circumference of the winding core 131 , the heat dissipation part 124 is provided with heat dissipation protrusions along the aluminum shell 11 The direction in which the inner wall extends and is in contact with the inner wall of the aluminum shell 11. The design of the heat dissipation protrusion can assist the heat conductive member 12 in dissipating heat to the core 131, further improving the uniformity of heat dissipation.

Please refer to any of Figures 1 and 2, 3, 4, 5 and 6. In some embodiments, the thermal conductive column 121, the first heat transfer part 122 and the second heat transfer part 123 are integrated. Molding, such a structural design can improve the heat transfer efficiency of the thermal conductive member 12, facilitate the winding processing of the anode foil 1311, the electrolytic paper 1313, and the cathode foil 1312, and also facilitate the assembly of the aluminum electrolytic capacitor 10. In some embodiments, if the heat conductive member 12 includes a heat dissipation part 124, the heat conduction pillar 121, the first heat transfer part 122, the second heat transfer part 123 and the heat dissipation part 124 may be integrally formed. The heat conduction member 12 formed in this way is a heat conductive part. ring, such as a square heat-conducting ring, which can effectively reduce the obstruction of heat conduction and make the heat transfer in the heat-conducting member 12 smoother. In some alternative embodiments, the thermal conductive pillar 121 , the first heat transfer part 122 and the second heat transfer part 123 are integrally formed, and the heat dissipation part 124 is integrated with the thermal conductive pillar 121 , the first heat transfer part 122 and the second heat transfer part 123 Set up separately, this can reduce the difficulty of rolling the core 131 in the heat conduction column 121. When assembling it into the accommodation cavity 110 of the aluminum shell 11, the heat dissipation part 124 can be installed into the aluminum shell 11 first, and then the roll core 131 can be assembled into the aluminum shell 11. The thermal conductive column 121 around the winding core 131 and the first heat transfer part 122 and the second heat transfer part 123 are assembled into the aluminum shell 11 so that the first heat transfer part 122 and the second heat transfer part 123 are in contact with the heat dissipation part 124 , of course, you can also first install the thermal conductive column 121 wound with the winding core 131 and the first heat transfer part 122 and the second heat transfer part 123 into the aluminum shell 11 , and then assemble the heat dissipation part 124 into the aluminum shell 11 .

Please refer to Figure 3, Figure 4, Figure 5, Figure 7, and Figure 8. In some embodiments, the number of the thermal conductive member 12 is one. When the number of the thermal conductive member 12 is one, the thermal conductive column 121 is inside the aluminum shell 11. The orthographic projection of the bottom wall is circular, and the thermal conductive column 121 is a cylindrical structure, which can effectively increase the contact area between the thermal conductive column 121 and the inside of the roll core 131, thereby conducive to conducting the heat generated in the center of the roll core 131 to the roll as much as possible. Outside the core 131, the thermal conductive column 121 is cylindrical and has a large thermal conductive cross-sectional area, which is also conducive to heat conduction. When the number of the heat conductive member 12 is one, the number of the first heat transfer parts 122 may be one or more than two. When the number of the first heat transfer parts 122 is more than two, all the first heat transfer parts 122 The thermal conductive columns 121 are evenly distributed along the circumferential positions at the same height. 121 outer periphery, that is, all the first heat transfer parts 122 are centered on the thermal conductive column 121 and extend radially toward the inner wall of the aluminum shell 11 .

Please refer to Figures 1, 9, and 10. In some alternative embodiments, the number of heat conductive members 12 is more than two, and the orthographic projection of each heat conductive column 121 on the inner bottom wall of the aluminum shell 11 is in the shape of a second fan. ring 12101, and all the second sector rings 12101 are connected in pairs to form a circular ring; or the orthographic projection of each heat conduction column 121 on the inner bottom wall of the aluminum shell 11 forms a third sector 12102, and all the third sectors 12102 total The two adjacent third sectors 12102 at the center of the circle are connected. Regardless of whether the orthographic projection of the thermal conductive column 121 on the inner bottom wall of the aluminum shell 11 is in the shape of a second fan ring 12101 or a third sector 12102, two adjacent thermal conductive columns 121 are in contact with each other, so that each thermal conductive column 121 absorbs and contacts each other. When the heat of the winding core 131 is transferred, it can be conducted to the adjacent heat conduction columns 121 so that all the heat conduction columns 121 can conduct heat. It can also enable the heat at various parts of the center of the roll core 131 to be conducted in time to improve the heat conduction of the roll core. Each part of the center of 131 is evenly heated to improve the consistency of each part of the core 131. Of course, when the number of thermal conductive members 12 is more than two, the orthographic projection of each thermal conductive column 121 on the inner bottom wall of the aluminum shell 11 can also be circular. When circular, two adjacent thermal conductive columns 121 The contact area between them is small, and the temperature uniformity effect is slightly inferior to that of the second fan ring 12101 or the third fan shape 12102.

Relative to the related art, the aluminum electrolytic capacitor provided by the embodiment of the present disclosure includes a thermal conductive member, and the thermal conductive member includes a thermal conductive column and at least one heat transfer part, the winding core is wound around the outer periphery of the thermal conductive column, and the first heat transfer part and The thermal conductive columns are connected, and extend from the thermal conductive columns to the inner wall of the aluminum shell and abut against the inner wall of the aluminum shell. Therefore, when the aluminum electrolytic capacitor is working, the heat generated inside the core can be conducted to the first heat conductor via the thermal conductive columns. part, and the first heat transfer part transmits heat to the aluminum shell, thereby realizing effective heat transfer and dissipation of the heat inside the core, effectively reducing the temperature inside the core, improving the temperature resistance of the aluminum electrolytic capacitor, making the aluminum Electrolytic capacitors can withstand the impact of large ripple currents, effectively solving the problems of failure of related aluminum electrolytic capacitors within their service life and poor ripple current resistance.

Based on the above-mentioned aluminum electrolytic capacitor 10, embodiments of the present disclosure also provide a method of manufacturing the above-mentioned aluminum electrolytic capacitor 10.

Referring to FIGS. 1 to 6 , in some embodiments, the manufacturing method of the aluminum electrolytic capacitor 10 includes the following steps.

(1) Connect the anode foil 1311 to the positive electrode lead terminal 132, and simultaneously connect the cathode foil 1312 to the negative electrode lead terminal 133.

In step (1), the anode foil 1311 and the cathode foil 1312 are both cut, for example, by an automatic cutting machine. After cutting, a foil material with appropriate specifications is obtained. In some embodiments, the positive lead-out terminal 132 is riveted to the anode foil 1311, and the negative lead-out terminal 133 is riveted to the cathode foil 1312. For example, the riveting can be achieved by a nailing machine. In some alternative embodiments, the positive lead terminal 132 and the anode foil 1311 are welded by ultrasonic waves, and the negative lead terminal 133 and the cathode foil 1312 are welded by ultrasonic waves.

(2) Place the electrolytic paper 1313 between the anode foil 1311 and the cathode foil 1312 so that the anode foil 1311 and the cathode foil 1312 are separated by the electrolytic paper 1313 to obtain a winding assembly.

In step (2), the electrolytic paper 1313 is also cut.

(3) Provide the thermal conductive member 12 including at least the thermal conductive column 121 and the first heat transfer part 122 .

The thermal conductive member 12 in step (3) may be the thermal conductive member 12 only including the thermal conductive column 121 and the first heat transfer part 122, and the thermal conductive column 121 and the first heat transfer part 122 may be integrally formed; it may also include the thermal conductive column 121 , the heat conduction member 12 of the first heat transfer part 122 and the second heat transfer part 123, and the heat conduction column 121, the first heat transfer part 122 and the second heat transfer part 123 are integrally formed, and the first heat transfer part 122 and the second heat transfer part 123 are integrally formed. The heat parts 123 are respectively provided at the opposite ends of the heat conduction column 121; it may also be a heat conduction member 12 including a heat conduction column 121, a first heat transfer part 122 and a heat dissipation part 124. In this case, in the heat conduction member 12, the heat conduction column 121, the first heat conduction part 122 and the heat dissipation part 124. A heat transfer part 122 and a heat dissipation part 124 are integrally formed. Alternatively, the thermal conduction pillar 121 and the first heat transfer part 122 may be integrally formed, while the heat dissipation part 124 is provided separately from the first heat transfer part 122. It may also include a thermal conduction pillar. 121. The heat conductive member 12 of the first heat transfer part 122, the second heat transfer part 123 and the heat dissipation part 124. At this time, in the heat conduction member 12, the heat conduction column 121, the first heat transfer part 122, the second heat transfer part 123 and The heat dissipation part 124 is integrally formed, and may also be the heat conduction pillar 121, the first heat transfer part 122 and the second heat transfer part 124. The heat part 123 is integrally formed, and the heat dissipation part 124 is provided separately from the first heat transfer part 122 and the second heat transfer part 123 .

(4) Wrap the winding assembly around the heat conduction column 121 to obtain the winding core 131 with the positive lead terminal 132 and the negative lead terminal 133 . The effective radius of the winding core 131 is not greater than the length of the first heat transfer part 122 .

In step (4), when winding, ensure that the electrolytic paper 1313 isolates the adjacent anode foil 1311 and the cathode foil 1312 to prevent the anode foil 1311 and the cathode foil 1312 from contacting and causing a short circuit. And after the anode foil 1311 and the cathode foil 1312 complete the winding, the electrolytic paper 1313 continues to be wound for at least one week, so that the outer circumference of the winding core is the electrolytic paper 1313, so as to avoid the anode foil 1311 when the winding core 131 is assembled to the aluminum shell 11 Or the cathode foil 1312 comes into contact and a short circuit occurs.

(5) Place the winding core 131 in the electrolyte for dipping treatment to obtain a semi-finished product.

In step (5), the core 131 is immersed in the electrolyte, so that the electrolytic paper 1313 absorbs a sufficient amount of the electrolyte.

(6) Assemble the semi-finished product into the aluminum shell 11 with the opening 1101 at one end, so that the first heat transfer part 122 is in contact with the inner wall of the aluminum shell 11 .

In step (6), if the heat conductive member 12 includes the heat dissipation part 124, the heat dissipation part 124 is also in contact with the inner wall of the aluminum shell 11, so that the heat dissipation part 124 is sandwiched between the aluminum shell 11 and the winding core 131.

(7) Pass the positive electrode lead-out terminal 132 and the negative electrode lead-out terminal 133 through the sealing member 14, and place the sealing member 14 into the opening 1101.

In step (7), the positive lead terminal 132 and the negative lead terminal 133 can be inserted through the seal 14, or the finished product can be rolled and assembled into the aluminum shell 11 and then the positive lead terminal 132 and the negative lead terminal 133 can be connected. Pass through the sealing member 14 respectively. In some embodiments, the positive lead terminal 132 includes a positive pole and a positive lead, wherein the positive post passes through the seal 14 , and one end of the positive lead is connected to the anode foil 1311 and the other end is connected to the positive post; the negative lead terminal 133 includes The main negative electrode and the negative electrode lead, the negative electrode post is passed through the seal 14, and one end of the negative electrode lead is connected to the cathode foil 1312, and the other end is connected to the negative electrode post.

(8) Perform waist sealing treatment on the aluminum shell 11 to obtain the aluminum electrolytic capacitor 10 .

In step (8), the aluminum shell 11 is waisted so that the portion of the aluminum shell 11 close to the end of the opening 1101 bulges toward the central axis of the opening 1101 along the circumferential direction, so that the aluminum shell 11 can be tightened. of seal.

In addition, it also includes aging, performance testing and classification, and packaging processing of the obtained aluminum electrolytic capacitor 10. These processes are all conventional processes for manufacturing the aluminum electrolytic capacitor 10, and therefore will not be described in detail here.

Relative to the related art, the manufacturing method of aluminum electrolytic capacitors provided by the embodiments of the present disclosure is to obtain a winding core by winding a winding assembly including an anode foil, an electrolytic paper, and a cathode foil on a thermally conductive column of a thermally conductive member. The compactness of the core winding can be improved; on the other hand, the structural strength of the core can be improved through the support of the thermal conductive column, which is beneficial to improving the yield rate of the assembly of the core and the aluminum shell; on the other hand, in the circumferential direction of the thermal conductive column The winding molded core is conducive to the heat dissipation inside the core of the aluminum electrolytic capacitor during use, thereby improving the service life and large ripple current tolerance of the aluminum electrolytic capacitor.

In order to better explain the aluminum electrolytic capacitor 10 provided by the embodiments of the present disclosure, the technical solution of the present disclosure is further explained below through multiple embodiments.

Example 1

The manufacturing method of a 450V, 330μF, Ф30×30 aluminum electrolytic capacitor 10 includes the following steps S11 to S17.

S11. Use an automatic cutting machine to cut the anode foil 1311, cathode foil 1312 and electrolytic paper 1313 of required specifications, and collect the anode foil 1311, cathode foil 1312 and electrolytic paper 1313 into reels for later use.

S12. Use a nailing machine to rivet the positive lead terminal 132 to the anode foil 1311, and rivet the negative lead terminal 133 to the cathode foil 1312. Rivet and place the electrolytic paper 1313 between the anode foil 1311 and the cathode foil 1312 to obtain a wound assembly.

S13. According to the size of the aluminum electrolytic capacitor 10, cut the thermally conductive insulating silicone into a collar of corresponding size, which is the thermal conductor 12. The thermal conductivity is approximately 5.0W/m·k, and the breakdown voltage is not less than 5.0Kv/ mm, the heat conduction member 12 includes a first heat conduction part (that is, the heat conduction column 121), a second heat conduction part (that is, the heat dissipation part 124), a first heat transfer part 122 and a second heat transfer part 123, and the first heat conduction part and The second heat transfer parts are arranged in parallel and spaced apart. The first heat transfer part 122 and the second heat transfer part 123 are arranged in parallel and spaced apart. The first heat transfer part 122 is connected to the first heat conduction part at one end of the first heat transfer part and is connected to the second heat transfer part. One end of the second thermal conductive part extends and is connected to the second thermal conductive part, and the second thermal conductive part 123 is connected to the other ends of the first thermal conductive part and the second thermal conductive part.

S14. Wind the winding assembly around the first thermal conductive part of a thermal conductive member 12 to obtain a winding core 131 with a positive lead terminal 132 and a negative lead terminal 133. Part of the winding core 131 passes through the first heat conductive part and the second heat conductive part. between the heat conduction parts, and the first heat transfer part 122 and the second heat transfer part 123 are respectively exposed at the opposite ends of the winding core 131, and the second heat transfer part is connected to the first heat transfer part on the outer peripheral side of the winding core 131 122 and the second heat transfer part 123.

S15. Put the wound core 131 and the thermal conductive member 12 into the fully automatic impregnation-laminating-assembly machine to complete the electrolyte impregnation of the core 131 and the adhesion of the thermal conductive member 12 to the side wall and lower wall of the aluminum shell 11. Close, girdle and seal to obtain the finished product.

S16. The aging machine performs aging and charging testing on the finished product.

S17. Transfer the finished products that pass the charging test to the automatic packaging machine for capacity and loss testing, and classify them according to the test results.

Example 2

The manufacturing method of a 450V, 330μF, Ф30×30 aluminum electrolytic capacitor 10 includes the following steps S21 to S27.

S21. Use an automatic cutting machine to cut the anode foil 1311, cathode foil 1312 and electrolytic paper 1313 of required specifications, and collect the anode foil 1311, cathode foil 1312 and electrolytic paper 1313 into reels for later use.

S22. Use a nailing machine to rivet the positive lead terminal 132 to the anode foil 1311, rivet the negative lead terminal 133 to the cathode foil 1312, and place the electrolytic paper 1313 between the anode foil 1311 and the cathode foil 1312 to obtain a winding assembly. .

S23. According to the size of the aluminum electrolytic capacitor 10, cut the thermally conductive insulating silicone into a collar of corresponding size, which is the thermal conductor 12. The thermal conductivity is approximately 5.0W/m·k, and the breakdown voltage is not less than 5.0Kv/ mm, the number of the thermal conductive members 12 obtained by cutting is multiple. Each thermal conductive member 12 includes a first thermal conductive part (that is, the thermal conductive column 121), a second thermal conductive part (that is, the heat dissipation part 124), and a first heat transfer part 122. and the second heat transfer part 123, and the first heat transfer part and the second heat transfer part are arranged in parallel and spaced apart, the first heat transfer part 122 and the second heat transfer part 123 are arranged in parallel and spaced apart, the first heat transfer part 122 is located between the first heat transfer part One end of the second thermal conductive part 123 is connected to the first thermal conductive part and extends to one end of the second thermal conductive part and is connected to the second thermal conductive part. The second thermal conductive part 123 is connected to the other ends of the first thermal conductive part and the second thermal conductive part.

S24. Wind the winding assembly around the first heat conduction parts of the three heat conduction members 12 to obtain the winding core 131 with the positive lead terminal 132 and the negative lead terminal 133. Part of the winding core 131 passes through the first heat conduction part and the third heat conduction part. between the two heat transfer parts, and the first heat transfer part 122 and the second heat transfer part 123 are respectively exposed at the opposite ends of the core 131, and the second heat transfer part is connected to the first heat transfer part on the outer peripheral side of the core 131 122 and the second heat transfer part 123, and the angle between the first heat transfer parts 122 of two adjacent heat conductive members 12 is 120°.

S25. Put the wound core 131 and the thermal conductive member 12 into the fully automatic impregnation-laminating-assembly machine to complete the electrolyte impregnation of the core 131 and the adhesion of the thermal conductive member 12 to the side wall and lower wall of the aluminum shell 11. Close, girdle and seal to obtain the finished product.

S26. The aging machine performs aging and charging testing on the finished product.

S27. Transfer the finished products that pass the charging test to the automatic packaging machine for capacity and loss testing, and classify them according to the test results.

Example 3

The manufacturing method of a 450V, 330μF, Ф30×30 aluminum electrolytic capacitor 10 includes the following steps S31 to S37.

S31. Use an automatic cutting machine to cut the anode foil 1311, cathode foil 1312 and electrolytic paper 1313 of required specifications, and collect the anode foil 1311, cathode foil 1312 and electrolytic paper 1313 into reels for later use.

S32. Use a nailing machine to rivet the positive lead terminal 132 to the anode foil 1311, rivet the negative lead terminal 133 to the cathode foil 1312, and place the electrolytic paper 1313 between the anode foil 1311 and the cathode foil 1312 to obtain a winding assembly. .

S33. According to the size of the aluminum electrolytic capacitor 10, cut the thermally conductive insulating silicone into a collar of corresponding size, which is the thermal conductor 12. The thermal conductivity is approximately 5.0W/m·k, and the breakdown voltage is not less than 5.0Kv/ mm, the number of the thermal conductive members 12 obtained by cutting is multiple. Each thermal conductive member 12 includes a first thermal conductive part (that is, the thermal conductive column 121), a second thermal conductive part (that is, the heat dissipation part 124), and a first heat transfer part 122. and the second heat transfer part 123, and the first heat transfer part and the second heat transfer part are arranged in parallel and spaced apart, the first heat transfer part 122 and the second heat transfer part 123 are arranged in parallel and spaced apart, the first heat transfer part 122 is located between the first heat transfer part One end of the second thermal conductive part 123 is connected to the first thermal conductive part and extends to one end of the second thermal conductive part and is connected to the second thermal conductive part. The second thermal conductive part 123 is connected to the other ends of the first thermal conductive part and the second thermal conductive part.

S34. Wind the winding assembly around the first thermal conductive parts of the five thermal conductive members 12 to obtain the winding core 131 with the positive lead-out terminal 132 and the negative lead-out terminal 133. Part of the winding core 131 passes through the first heat conduction part and the third heat conduction part. between the two heat transfer parts, and the first heat transfer part 122 and the second heat transfer part 123 are respectively exposed at the opposite ends of the core 131, and the second heat transfer part is connected to the first heat transfer part on the outer peripheral side of the core 131 122 and the second heat transfer part 123, and the angle between the first heat transfer parts 122 of two adjacent heat conductive members 12 is 72°.

S35. Put the wound core 131 and the thermal conductive member 12 into the fully automatic impregnation-laminating-assembly machine to complete the electrolyte impregnation of the core 131 and the adhesion of the thermal conductive member 12 to the side wall and lower wall of the aluminum shell 11. Close, girdle and seal to obtain the finished product.

S36. The aging machine performs aging and charging testing on the finished product.

S37. Transfer the finished products that pass the charging test to the automatic packaging machine for capacity and loss testing, and classify them according to the test results.

Example 4

The manufacturing method of a 450V, 330μF, Ф30×30 aluminum electrolytic capacitor 10 includes the following steps S41 to S47.

S41. Use an automatic cutting machine to cut the anode foil 1311, cathode foil 1312 and electrolytic paper 1313 of required specifications, and collect the anode foil 1311, cathode foil 1312 and electrolytic paper 1313 into reels for later use.

S42. Use a nailing machine to rivet the positive lead terminal 132 to the anode foil 1311, rivet the negative lead terminal 133 to the cathode foil 1312, and place the electrolytic paper 1313 between the anode foil 1311 and the cathode foil 1312 to obtain a winding assembly. .

S43. According to the size of the aluminum electrolytic capacitor 10, cut the thermally conductive insulating silicone into a collar of corresponding size, which is the thermal conductor 12. The thermal conductivity is approximately 5.0W/m·k, and the breakdown voltage is not less than 5.0Kv/ mm, the number of the thermal conductive members 12 obtained by cutting is multiple. Each thermal conductive member 12 includes a first thermal conductive part (that is, the thermal conductive column 121), a second thermal conductive part (that is, the heat dissipation part 124), and a first heat transfer part 122. and the second heat transfer part 123, and the first heat transfer part and the second heat transfer part are arranged in parallel and spaced apart, the first heat transfer part 122 and the second heat transfer part 123 are arranged in parallel and spaced apart, the first heat transfer part 122 is located between the first heat transfer part One end of the second thermal conductive part 123 is connected to the first thermal conductive part and extends to one end of the second thermal conductive part and is connected to the second thermal conductive part. The second thermal conductive part 123 is connected to the other ends of the first thermal conductive part and the second thermal conductive part.

S44. Wind the winding assembly around the first thermal conductive parts of the six thermal conductive members 12 to obtain the winding core 131 with the positive lead-out terminal 132 and the negative lead-out terminal 133. Part of the winding core 131 passes through the first heat conduction part and the third heat conduction part. between the two heat transfer parts, and the first heat transfer part 122 and the second heat transfer part 123 are respectively exposed at the opposite ends of the core 131, and the second heat transfer part is connected to the first heat transfer part on the outer peripheral side of the core 131 122 and the second heat transfer part 123, and the angle between the first heat transfer parts 122 of two adjacent heat conductive members 12 is 60°.

S45. Put the wound core 131 and the thermal conductive member 12 into the fully automatic impregnation-laminating-assembly machine to complete the electrolyte solution for the core 131 Impregnation, bonding of the thermal conductive member 12 to the side wall and lower wall of the aluminum shell 11, and waist sealing, the finished product is obtained.

S46. The aging machine performs aging and charging testing on the finished product.

S47. Transfer the finished products that pass the charging test to the automatic packaging machine for capacity and loss testing, and classify them according to the test results.

Example 5

The manufacturing method of a 450V, 330μF, Ф30×30 aluminum electrolytic capacitor 10 includes the following steps S51 to S57.

S51. Use an automatic cutting machine to cut the anode foil 1311, cathode foil 1312 and electrolytic paper 1313 of required specifications, and collect the anode foil 1311, cathode foil 1312 and electrolytic paper 1313 into reels for later use.

S52. Use a nailing machine to rivet the positive lead terminal 132 to the anode foil 1311, rivet the negative lead terminal 133 to the cathode foil 1312, and place the electrolytic paper 1313 between the anode foil 1311 and the cathode foil 1312 to obtain a winding assembly. .

S53. According to the size of the aluminum electrolytic capacitor 10, cut the thermally conductive insulating silicone into thermally conductive parts 12 of corresponding sizes. The thermal conductivity is approximately 5.0W/m·k, and the breakdown voltage is not less than 5.0Kv/mm. The cutting results are The number of thermal conductive members 12 is multiple. Each thermal conductive member 12 includes a first thermal conductive part (that is, a thermal conductive column 121), a first heat transfer part 122 and a second heat transfer part 123, and the first heat transfer part 122 and the second heat transfer part 123. The two heat transfer parts 123 are arranged in parallel and spaced apart. The first heat transfer part 122 is connected to one end of the first heat transfer part, and the second heat transfer part 123 is connected to the other end of the first heat transfer part.

S54. Wind the winding assembly around the first heat conduction part of a heat conduction member 12 to obtain the winding core 131 with the positive lead terminal 132 and the negative lead terminal 133, and the first heat transfer part 122 and the second heat transfer part 123 They are respectively exposed at opposite ends of the winding core 131 .

S55. Put the wound core 131 and the thermal conductive member 12 into the fully automatic impregnation-laminating-assembly machine to complete the electrolyte impregnation of the core 131 and the adhesion of the thermal conductive member 12 to the side wall and lower wall of the aluminum shell 11. Close, girdle and seal to obtain the finished product.

S56. The aging machine performs aging and charging testing on the finished product.

S57. Transfer the finished products that pass the charging test to the automatic packaging machine for capacity and loss testing, and classify them according to the test results.

Example 6

The manufacturing method of a 450V, 330μF, Ф30×30 aluminum electrolytic capacitor 10 includes the following steps S61 to S67.

S61. Use an automatic cutting machine to cut the anode foil 1311, cathode foil 1312 and electrolytic paper 1313 of required specifications, and collect the anode foil 1311, cathode foil 1312 and electrolytic paper 1313 into reels for later use.

S62. Use a nailing machine to rivet the positive lead terminal 132 to the anode foil 1311, rivet the negative lead terminal 133 to the cathode foil 1312, and place the electrolytic paper 1313 between the anode foil 1311 and the cathode foil 1312 to obtain a winding assembly. .

S63. According to the size of the aluminum electrolytic capacitor 10, cut the thermally conductive insulating silica gel into thermally conductive parts 12 of corresponding sizes. The thermal conductivity is approximately 5.0W/m·k, and the breakdown voltage is not less than 5.0Kv/mm. Cut to obtain There are multiple heat conduction members 12. Each heat conduction member 12 includes a first heat conduction part (ie, a heat conduction column 121), two first heat transfer parts 122 and two second heat transfer parts 123. All the first heat transfer parts 123 are The heat part 122 is connected to the first heat transfer part at one end of the first heat transfer part, and all the second heat transfer parts 123 are connected to the other end of the first heat transfer part. The angle between the two first heat transfer parts 122 is 180°, and the included angle between the two second heat transfer parts 123 is 180°.

S64. Wind the winding assembly around the first heat conduction part of a heat conduction member 12 to obtain the winding core 131 with the positive lead terminal 132 and the negative lead terminal 133, and the first heat transfer part 122 and the second heat transfer part 123 They are respectively exposed at opposite ends of the winding core 131 .

S65. Put the wound core 131 and the thermal conductive member 12 into the fully automatic impregnation-laminating-assembly machine to complete the electrolyte impregnation of the core 131 and the adhesion of the thermal conductive member 12 to the side wall and lower wall of the aluminum shell 11. Close, girdle and seal to obtain the finished product.

S66. The aging machine performs aging and charging testing on the finished product.

S67. Transfer the finished products that pass the charging test to the automatic packaging machine for capacity and loss testing, and classify them according to the test results.

Comparative ratio

The manufacturing method of a 450V, 330μF, Ф30×30 aluminum electrolytic capacitor 10 includes the following steps: use an automatic cutting machine to cut the anode foil 1311, cathode foil 1312 and electrolytic paper 1313 to the required width and collect them into reels Reserve; rivet the anode foil 1311 and cathode foil 1312 using a nailing and rolling machine, and place the electrolytic paper 1313 in the middle to roll into a core 131; put the rolled core 131 into a fully automatic impregnation-laminating-assembly The machine completes the electrolyte impregnation of the core 131, inserts the core 131 into the aluminum shell 11, and seals the waist to obtain the finished product; the aging machine performs aging and charging testing on the finished product; the finished product that passes the charging test is transferred to the automatic packaging machine for capacity and loss testing, and classification based on the test results.

According to the above manufacturing method, the qualified aluminum electrolytic capacitors 10 of Examples 1 to 6 and the comparative example were selected to perform corresponding performance tests. See Table 1 and Table 2 for details.

Test methods include the following.

(1) Initial parameter test: refer to GB/T5993-2003.

(2) Life test: refer to GB/T5993-2003, temperature is 125℃, duration is 5000h.

Table 1 Initial parameters and cycle test parameters of Examples 1 to 6 and Comparative Examples

Note: C represents capacity; tanσ represents loss; ESR represents equivalent series resistance; I _c represents leakage current.

As can be seen from Table 1, the introduction of thermal conductive parts into the core of aluminum electrolytic capacitors has no effect on the initial performance of aluminum electrolytic capacitors; after a life test of 125°C and 5000 hours, the following rules are shown: (1) With thermal conductive parts The attenuation amplitude of the capacitance performance of the aluminum electrolytic capacitor is smaller than the attenuation amplitude of the capacitance performance of the aluminum electrolytic capacitor without a thermal conductive member. (2) When using thermally conductive parts with the same structure, the greater the number of thermally conductive parts, the smaller the attenuation of the capacitance performance of the aluminum electrolytic capacitor, and the aluminum electrolytic capacitor has a longer service life. From a certain side, it shows that the heat generated by the winding core Heat is more easily transferred to the aluminum shell for heat dissipation; and when the number of thermal conductive parts with the same structure increases to a certain number, the thermal conduction efficiency area is balanced, and the capacitance performance attenuation of the aluminum electrolytic capacitor no longer changes significantly. (3) Relative to a thermal conductive member that includes a first thermal conductive part (that is, a thermal conductive column), a second thermal conductive part (that is, a heat dissipation part), a first heat transfer part, and a second heat transfer part, only the first thermal conductive part includes The thermal conductive parts of the first heat transfer part and the second heat transfer part have a relatively small attenuation of the capacitance performance of the corresponding aluminum electrolytic capacitor, and the processing is easier, which is beneficial to improving the processing and manufacturing efficiency. Moreover, in the same thermal conductive member, the greater the number of first conductive parts and second conductive parts, the smaller the capacitive performance attenuation range will be. .

At the same time, temperature rise changes under different ripple current loads were tested for the examples and comparative examples, refer to GB/T5993-2003. The result is as follows As shown in Table 2.

Table 2 Temperature rise change parameters of Examples 1 to 6 and Comparative Examples under different ripple current loads

In Table 2, ΔT represents the temperature difference between the inside and outside of the winding core 131, that is, ΔT = the temperature inside the winding core 131 - the temperature on the surface of the aluminum shell 11.

It can be seen from Table 2 that after the ripple current is applied, the greater the number of thermal conductive parts, the better the heat conduction efficiency. The heat generated at the core is quickly conducted to the surface of the aluminum shell, thereby reducing the temperature at the core, which is consistent with the surface temperature of the aluminum shell. The temperature difference is smaller and can carry larger ripple current (Embodiments 1 to 4); in the thermal conductive part, the greater the number of the first heat transfer part and the second heat transfer part, the better the heat energy in the core can be The ground is transferred to the surface of the aluminum shell, thereby reducing the temperature inside the winding core. The temperature difference between the temperature inside the winding core and the surface of the aluminum shell is smaller, and it can carry a larger ripple current (Embodiments 5-6). If the aluminum electrolytic capacitor is not equipped with a thermal conductive component, the heat at the core is first conducted to the air in the aluminum shell through the positive and negative foils and electrolytic paper, and then conducted to the aluminum shell for dissipation. The thermal conductivity of the electrolytic paper and air is poor. The heat cannot be dissipated in time, so the temperature difference is higher and the ripple current that can be loaded is smaller.

Based on the above-mentioned Examples 1 to 6 and the comparative examples, it can be seen that by winding the winding core in the thermal conductive member and assembling it into an aluminum electrolytic capacitor, the heat generated at the winding core can be effectively conducted away and the winding volume can be reduced. The temperature rise of the core enables the aluminum electrolytic capacitor to carry a larger ripple current, reducing the attenuation amplitude of the capacitance performance of the aluminum electrolytic capacitor, which is beneficial to extending the service life of the aluminum electrolytic capacitor.

The above serial numbers of the embodiments of the present disclosure are only for description and do not represent the advantages and disadvantages of the embodiments. The above are only specific embodiments of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any person familiar with the technical field can easily think of various equivalent methods within the technical scope disclosed in the present disclosure. Modifications or substitutions, these modifications or substitutions should be covered by the protection scope of this disclosure. Therefore, the protection scope of the present disclosure should be subject to the protection scope of the claims.

Claims

An aluminum electrolytic capacitor, including:

An aluminum shell, the aluminum shell has a receiving cavity with an opening at one end;

Thermal conductive member, the thermal conductive member includes a thermal conductive column and at least one first heat transfer part, the thermal conductive column extends from the open end to the bottom of the aluminum shell; all the first heat transfer parts are in contact with the The thermal conductive columns are connected, extend from the thermal conductive columns in the direction of the inner wall of the aluminum shell, and are in contact with the inner wall of the aluminum shell; and

Electrolytic component, the electrolytic component includes a core wound around the outer periphery of the thermally conductive column,

Wherein, the heat conductive member and the electrolytic component are both accommodated in the accommodation cavity.
The aluminum electrolytic capacitor according to claim 1, wherein the first heat transfer part is provided between the winding core and the inner bottom wall of the aluminum shell, and is close to the inner bottom wall of the aluminum shell. ;

And/or, all the first heat transfer parts are evenly distributed along the circumferential direction of the heat conduction column.
The aluminum electrolytic capacitor according to claim 2, wherein the orthographic projection of the first heat transfer part on the inner bottom wall of the aluminum shell is in a first sector shape, and the first sector shape is divided into two parts. The distance between the strip radii gradually increases toward the inner wall of the aluminum shell.
The aluminum electrolytic capacitor according to claim 2, wherein the thermal conductive member further includes at least one second heat transfer part, and all of the second heat transfer parts are provided between the opening and the winding core; All the second heat transfer parts are connected to the thermal conductive columns, extend from the thermal conductive columns in the direction of the inner wall of the aluminum shell, and abut against the inner wall of the aluminum shell.
The aluminum electrolytic capacitor according to claim 4, wherein the orthographic projection of the second heat transfer part on the inner bottom wall of the accommodation cavity is in a second fan shape, and the second fan shape is formed by a distance between two radii. The distance gradually increases toward the inner wall of the accommodation cavity.
The aluminum electrolytic capacitor according to claim 4, wherein the heat conductive member further includes a heat dissipation part, the heat dissipation part is close to the inner side wall of the aluminum shell and extends from the open end to the bottom of the aluminum shell. Set up and connected to the first heat transfer part and the second heat transfer part respectively;

Alternatively, the heat conductive member further includes a heat dissipation part, the heat dissipation part is arranged around the outer periphery of the winding core and abuts against the inner wall of the aluminum shell, and is connected to the first heat transfer part;

Alternatively, the heat conductive member further includes a heat dissipation part, the heat dissipation part is arranged around the outer periphery of the winding core and abuts against the inner wall of the aluminum shell, and is connected to the second heat transfer part;

Alternatively, the heat conductive member further includes a heat dissipation part, and the heat dissipation part includes a first heat dissipation ring, a second heat dissipation ring, and a vapor chamber connected between the first heat dissipation ring and the second heat dissipation ring; The first heat dissipation ring is arranged on the outer periphery of the winding core and is close to the inner wall of the aluminum shell, and is connected to the first heat transfer part; the second heat dissipation ring is arranged on the outer circumference of the winding core. The outer periphery is close to the inner wall of the aluminum shell and connected to the second heat transfer part; the uniform heat plate is close to the inner wall of the aluminum shell.
The aluminum electrolytic capacitor according to claim 6, wherein the heat dissipation part is in surface contact with the inner side wall of the aluminum shell;

Alternatively, the heat dissipation part is provided with a heat dissipation protrusion, and the heat dissipation protrusion extends along the direction in which the inner side wall of the aluminum shell extends and abuts against the inner side wall of the aluminum shell;

Alternatively, the orthographic projection of the heat dissipation portion on the inner bottom wall of the aluminum shell is a first fan ring, and the outer diameter of the first fan ring is equal to the outer diameter of the first fan ring. The inner diameter of the aluminum shell is the same;

Alternatively, the orthographic projection of the heat dissipation portion on the inner bottom wall of the aluminum shell is a first circular ring, and the outer diameter of the first circular ring is the same as the inner diameter of the aluminum shell.
The aluminum electrolytic capacitor according to claim 4, wherein the distance between the first heat transfer part and the second heat transfer part is greater than the height of the winding core and less than the height of the aluminum shell.
The aluminum electrolytic capacitor according to any one of claims 1 to 8, wherein the number of the thermal conductive member is one, and the orthographic projection of the thermal conductive column on the inner bottom wall of the aluminum shell is circular;

Alternatively, the number of the thermal conductive members is more than two, and the orthographic projection of each thermal conductive column on the inner bottom wall of the aluminum shell forms a second fan ring, and all the second fan rings are connected in pairs. to form a circle;

Alternatively, the number of the thermal conductive members is more than two, and the orthographic projection of each thermal conductive column on the inner bottom wall of the aluminum shell is in the shape of a second sector, and all the second sector shapes have a common center and are adjacent to each other. The two second sector shapes are connected.
The aluminum electrolytic capacitor according to any one of claims 1 to 8, wherein the aluminum electrolytic capacitor further includes a seal; the electrolytic component further includes a positive lead terminal and a negative lead terminal;

The winding core includes anode foil, electrolytic paper and cathode foil, and the winding core is wound by the anode foil, electrolytic paper and cathode foil;

The sealing member is used to seal the opening;

The positive lead-out terminal is connected to the anode foil and passes through the seal to extend to the outside of the accommodation cavity; and

The negative lead-out terminal is connected to the cathode foil and passes through the seal to extend to the outside of the accommodation cavity.
A method for manufacturing aluminum electrolytic capacitors, including:

Connect the anode foil to the positive terminal, and connect the cathode foil to the negative terminal;

Place electrolytic paper between the anode foil and the cathode foil so that the anode foil and the cathode foil are separated by the electrolytic paper to obtain a winding assembly;

Provide a thermal conductive member including at least a thermal conductive column and a first heat transfer part;

The winding assembly is wound around the thermal conductive column to obtain a winding core with the positive electrode lead-out terminal and the negative electrode lead-out terminal. The effective radius of the winding core is not greater than the length of the first heat transfer part. ;

Place the roll core in the electrolyte for dipping treatment to obtain a semi-finished product;

Assemble the semi-finished product into an aluminum shell with an opening at one end, so that the first heat transfer part is in contact with the inner wall of the aluminum shell;

Pass the positive electrode lead-out terminal and the negative electrode lead-out terminal through the sealing member and place the sealing member into the opening; and

The aluminum shell is subjected to waist sealing treatment to obtain an aluminum electrolytic capacitor.
The method of manufacturing an aluminum electrolytic capacitor according to claim 11, wherein the heat conductive member further includes a heat dissipation part, the heat dissipation part is close to the inner wall of the aluminum shell and connected to the first heat transfer part .