Aluminum electrolytic capacitor

Abstract

The application discloses an aluminum electrolytic capacitor and relates to the technical field of electrolytic capacitors. The aluminum electrolytic capacitor comprises a shell, a cover plate and a core package. The core package comprises an anode foil, a cathode foil and two lead pins. One side of one lead pin is welded to the anode foil by laser welding. The other side of the one lead pin penetrates the cover plate. The other lead pin is welded to the cathode foil by laser welding. The other side of the lead pin penetrates the cover plate. The lead pin comprises an aluminum tongue and a lead wire. One side of the lead wire is connected with the aluminum tongue. The other side of the lead wire penetrates the cover plate. The aluminum tongue is inserted into the anode foil or the cathode foil at the side far from the lead wire. When the aluminum tongue is welded to the anode foil or the cathode foil, the conductive area between the lead wire and the anode foil or the cathode foil is increased, and the lead wire can be stably connected to the anode foil or the cathode foil through the aluminum tongue, so that the lead wire and the anode foil or the cathode foil are not easy to fall off, and the use of the aluminum electrolytic capacitor is ensured.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electrolytic capacitor, in particular to an aluminum electrolytic capacitor. BACKGROUND

[0002] At present, in the production of aluminum electrolytic capacitor, the lead-out wire is connected with the aluminum foil by piercing rivet connection. Since it is simple physical contact, there is a large contact resistance after piercing rivet, which will generate heat when used at high frequency. Moreover, due to the small contact area, the current density is too large, which also causes heating. Furthermore, due to the existence of aluminum surface oxide film, the contact resistance is large, and the oxidation and reduction of the surrounding electrolyte will further reduce the contact point, increase the contact resistance, increase the current density, and increase the thermal effect, which directly affects the service life and use range of the aluminum electrolytic capacitor. SUMMARY

[0003] The main purpose of the present application is to provide an aluminum electrolytic capacitor, which is designed to increase the conductive area between the lead-out wire and the anode foil or cathode foil when the aluminum tongue is welded on the anode foil or cathode foil, and also enables the lead-out wire to be stably connected to the anode foil or cathode foil through the aluminum tongue, so as to prevent the lead-out wire and the anode foil or cathode foil from falling off, thereby ensuring the use of the aluminum electrolytic capacitor.

[0004] To achieve the above purpose, the aluminum electrolytic capacitor provided by the present application comprises:

[0005] A housing, wherein an installation cavity with an installation port is formed in the housing;

[0006] A cover plate, wherein the cover plate is arranged on the installation port to block the installation cavity;

[0007] A core package, wherein the core package is installed in the installation cavity, the core package comprises an anode foil, a cathode foil and two guide pins, one side of one of the guide pins is welded to the anode foil by laser welding, the other side of the guide pin penetrates out of the cover plate, the other guide pin is welded to the cathode foil by laser welding, and the other side of the guide pin penetrates out of the cover plate;

[0008] Among them, the guide pin comprises an aluminum tongue and a lead-out wire, one side of the lead-out wire is connected with the aluminum tongue, the other side of the lead-out wire penetrates out of the cover plate, and the aluminum tongue is inserted into the anode foil or the cathode foil away from the other side of the lead-out wire.

[0009] In an embodiment, the aluminum tongue is flat.

[0010] In an embodiment, the aluminum tongue comprises two opposite clamping pieces and an elastic member, the elastic member is arranged between the two clamping pieces and is located on the side of the two clamping pieces close to the lead-out wire, so as to move the two clamping pieces close to each other, and the clamping pieces are welded to the cathode foil or the anode foil by laser welding.

[0011] In an embodiment, the two clamping pieces are each provided with a clamping strip on the opposite side, and the clamping strip is arranged obliquely away from the clamping piece and towards the elastic member.

[0012] In an embodiment, the clamping strip is provided with a plurality of clamping strips, and the plurality of clamping strips are arranged at intervals on the side of the clamping piece.

[0013] In an embodiment, each clamping strip is provided with a clamping protrusion on the side away from the clamping piece, and the clamping protrusion is provided with a plurality of clamping protrusions arranged at intervals on the clamping strip.

[0014] In an embodiment, the two clamping pieces are further provided with a plurality of drainage holes arranged at intervals on the opposite sides, and the plurality of drainage holes are arranged at intervals between the two clamping strips.

[0015] In an embodiment, each drainage hole has an inlet section, a transition section and an outlet section, the transition section is arranged between the inlet section and the outlet section, the cross-sectional area of the inlet section is smaller than that of the transition section, and the cross-sectional area of the transition section is larger than that of the outlet section.

[0016] In an embodiment, the aluminum electrolytic capacitor further comprises a plurality of heat dissipation members, the plurality of heat dissipation members are arranged in the mounting cavity and surround the outer peripheral wall of the core package, and both ends of each heat dissipation member penetrate out of the shell.

[0017] In an embodiment, each heat dissipation member comprises a heat absorbing section and a heat dissipation section connected together, the heat absorbing section is arranged in the mounting cavity and is attached to the outer peripheral wall of the core package, the heat dissipation section is arranged outside the shell, and the heat generated by the core package is conducted to the outside of the shell in sequence through the heat absorbing section and the heat dissipation section.

[0018] The technical scheme of the present application adopts a guide needle comprising an aluminum tongue and a lead-out wire, and when the aluminum tongue is welded on the anode foil or the cathode foil, not only the conductive area between the lead-out wire and the anode foil or the cathode foil is increased, but also the lead-out wire can be stably connected to the anode foil or the cathode foil through the aluminum tongue, so as to prevent the lead-out wire and the anode foil or the cathode foil from falling off, thereby ensuring the use of the aluminum electrolytic capacitor. BRIEF DESCRIPTION OF DRAWINGS

[0019] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the structure of an embodiment of the aluminum electrolytic capacitor provided by the present invention;

[0021] Figure 2 for Figure 1 A partially enlarged sectional view;

[0022] Figure 3 This is a schematic diagram of another embodiment of the aluminum electrolytic capacitor provided by the present invention;

[0023] Figure 4 for Figure 3 A partially enlarged sectional view;

[0024] Figure 5 A schematic diagram of the lead wire of the aluminum electrolytic capacitor provided by the present invention;

[0025] Figure 6 This is an internal cross-sectional view of the clamping piece of the aluminum electrolytic capacitor provided by the present invention.

[0026] Explanation of icon numbers:

[0027] 10. Aluminum electrolytic capacitor; 1. Shell; 11. Mounting cavity; 2. Core; 23. Guide pin; 231. Aluminum tongue; 2311. Clamping piece; 2313. Clamping strip; 2314. Clamping protrusion; 2315. Drain hole; 231a. Inlet section; 231b. Transition section; 231c. Outlet section; 232. Lead wire; 3. Heat sink; 31. Heat absorption section; 32. Heat dissipation section; 4. Cover plate.

[0028] The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0029] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0030] It should be noted that if the embodiments of the present invention involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0031] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0032] This invention proposes an aluminum electrolytic capacitor that, when welded to the anode or cathode foil by an aluminum tongue, not only increases the conductive area between the lead wire and the anode or cathode foil, but also ensures that the lead wire is stably connected to the anode or cathode foil by the aluminum tongue, thereby preventing the lead wire from easily detaching from the anode or cathode foil and ensuring the usability of the aluminum electrolytic capacitor.

[0033] Please see Figures 1 to 6 In one embodiment of the present invention, the aluminum electrolytic capacitor 10 includes:

[0034] The outer casing 1 has a mounting cavity 11 with a mounting opening inside it;

[0035] Cover plate 4, which is placed over the mounting opening to seal the mounting cavity 11;

[0036] Core package 2 is installed in the mounting cavity 11. Core package 2 includes an anode foil, a cathode foil, and two guide pins 23. One side of one guide pin 23 is laser welded to the anode foil, and the other side of one guide pin 23 protrudes from the cover plate 4. The other guide pin 23 is laser welded to the cathode foil, and the other side of the guide pin 23 protrudes from the cover plate 4.

[0037] The guide needle 23 includes an aluminum tongue 231 and a lead wire 232. One side of the lead wire 232 is connected to the aluminum tongue 231, and the other side of the lead wire 232 passes through the cover plate 4. The aluminum tongue 231 is inserted into the anode foil or the cathode foil on the side away from the lead wire 232.

[0038] As is known, the aluminum electrolytic capacitor 10 includes a housing 1, a cover plate 4, and a core package 2. The housing 1 forms a mounting cavity 11 with a mounting opening. The core package 2 is disposed in the mounting cavity 11, and the cover plate is placed on the mounting opening to seal the core package 2 in the mounting cavity 11. The core package 2 includes an anode foil, a cathode foil, two electrolytic papers, and two leads 232, etc. The anode foil, the cathode foil, and the two electrolytic papers are wound in sequence. One lead 232 is electrically connected to the anode foil, and the other lead 232 is electrically connected to the cathode foil. The two leads 232 pass through the housing 1 on the side away from the anode foil or the cathode foil.

[0039] In this embodiment, the core package 2 also includes two guide pins 23. One side of one guide pin 23 is laser-welded to the anode foil, and the other side of one guide pin 23 protrudes through the cover plate 4. The other guide pin 23 is laser-welded to the cathode foil, and the other side of the guide pin 23 protrudes through the cover plate 4. The guide pins 23 are directly connected to the anode foil and the cathode foil by welding, which makes the conductive area between the guide pin 23 and the anode foil or cathode foil large and the mechanical damage to the anode foil and cathode foil small. The resulting aluminum electrolytic capacitor 10 has low internal resistance and strong resistance to high current surges and ripple waves.

[0040] Specifically, each lead 23 includes an aluminum tongue 231 and a lead wire 232. One side of the lead wire 232 is connected to the aluminum tongue 231, while the other side of the lead wire 232 extends out of the outer casing 1. The aluminum tongue 231 is connected to the anode foil and cathode foil by welding on the side away from the lead wire 232. It should be noted that the aluminum tongue 231 has a certain area. Therefore, when the aluminum tongue 231 is welded to the anode foil or cathode foil, it not only increases the conductive area between the lead wire 232 and the anode foil or cathode foil, but also makes the lead wire 232 stably connected to the anode foil or cathode foil through the aluminum tongue 231, so as to ensure that the lead wire 232 and the anode foil or cathode foil are not easily detached, thereby ensuring the use of the aluminum electrolytic capacitor 10.

[0041] In one implementation, please refer to Figure 5The aluminum tongue 231 is flat, which increases the contact area between the aluminum tongue 231 and the anode foil or cathode foil, thereby increasing the welding area between the aluminum tongue 231 and the anode foil or cathode foil. This results in a large conductive area between the guide pin 23 and the anode foil or cathode foil, and less mechanical damage to the anode foil and cathode foil. The resulting aluminum electrolytic capacitor 10 has low internal resistance, strong resistance to high current surges, and strong ripple resistance.

[0042] In one implementation, please refer to Figure 5 The aluminum tongue 231 includes two opposing clamping pieces 2311 and an elastic element. The elastic element is located on the side of the two clamping pieces 2311 near the lead wire 232 to bring the two clamping pieces 2311 closer to each other. The clamping pieces 2311 are laser welded to the cathode foil or anode foil. The two clamping pieces 2311 can be stably clamped on both sides of the anode foil and cathode foil, thereby ensuring a full connection between the clamping pieces 2311 and the anode foil and cathode foil.

[0043] In this embodiment, the aluminum tongue 231 includes two opposing clamping pieces 2311 and an elastic element. The elastic element is located between the two clamping pieces 2311 and on the side of the two clamping pieces 2311 closest to the lead wire 232. By providing the elastic element, the two clamping pieces 2311 can always be kept close to each other, thereby stably clamping the anode foil and cathode foil, thus ensuring the connection between the clamping pieces 2311 and the anode foil and cathode foil. At the same time, the clamping pieces 2311 need to be laser welded to the anode foil and cathode foil to avoid the possibility of a weak connection between the clamping pieces 2311 and the anode foil and cathode foil.

[0044] In one implementation, please refer to Figure 5 Both clamping pieces 2311 are provided with clamping strips 2313 on their opposite sides. The clamping strips 2313 are inclined toward the elastic member on the side away from the clamping pieces 2311. By providing clamping strips 2313 on the clamping pieces 2311, the anode foil and the cathode foil can be stably clamped to prevent the clamping pieces 2311 from separating from the anode foil and the cathode foil.

[0045] In this embodiment, in order to further clamp the anode foil and the cathode foil, clamping strips 2313 are provided on the opposing sides of the two clamping pieces 2311, and each clamping strip 2313 is inclined towards the elastic member on the side away from the clamping piece 2311. In this way, when the two clamping pieces 2311 clamp the anode foil and the cathode foil, the two opposing clamping strips 2313 can stably clamp the anode foil and the cathode foil, and under the action of the elastic member, the clamping strips 2313 can clamp the anode foil and the cathode foil more stably.

[0046] In one implementation, please refer toFigure 5 Multiple clamping bars 2313 are provided, and the multiple clamping bars 2313 are spaced apart on the side of the clamping piece 2311. By providing multiple clamping bars 2313, it can be ensured that the anode foil and the cathode foil are clamped between the two clamping pieces 2311, thereby facilitating subsequent welding processes and ensuring the contact area between the anode foil, the cathode foil and the clamping piece 2311.

[0047] In one implementation, please refer to Figure 5 Each of the clamping bars 2313 has a clamping protrusion 2314 on one side away from the clamping piece 2311. There are multiple clamping protrusions 2314, which are spaced apart from each other on the clamping bar 2313. This arrangement allows the anode foil and cathode foil to be clamped better.

[0048] In one implementation, please refer to Figure 5 The two clamping plates 2311 are also provided with a plurality of spaced-apart drainage holes 2315 on their opposite sides. The plurality of drainage holes 2315 are spaced apart between the two clamping bars 2313. By providing drainage holes 2315, the solder can flow smoothly through the drainage holes 2315 into the anode foil, cathode foil and clamping plate 2311, thereby increasing the conductive area between the lead wire 232 and the anode foil or cathode foil. It also makes the lead wire 232 stably connected to the anode foil or cathode foil through the aluminum tongue 231, so as to ensure that the lead wire 232 and the anode foil or cathode foil are not easily detached, thereby ensuring the use of the aluminum electrolytic capacitor 10.

[0049] In one implementation, please refer to Figure 6 Each of the aforementioned drainage holes 2315 has an inlet section 231a, a transition section 231b, and an outlet section 231c. The transition section 231b is disposed between the inlet section 231a and the outlet section 231c. The cross-sectional area of ​​the inlet section 231a is smaller than that of the transition section 231b, and the cross-sectional area of ​​the transition section 231b is larger than that of the outlet section 231c. This arrangement allows solder to quickly flow through the drainage holes 2315 into the space between the anode foil, the cathode foil, and the clamping piece 2311.

[0050] In this embodiment, to facilitate solder flow, each drain hole 2315 has an inlet section 231a, a transition section 231b, and an outlet section 231c. The transition section 231b is located between the inlet section 231a and the outlet section 231c. The cross-sectional area of ​​the inlet section 231a is smaller than that of the filter section, while the cross-sectional area of ​​the transition section 231b is larger than that of the outlet section 231c. Thus, when the solder enters the inlet section 231a, the larger cross-sectional area of ​​the transition section 231b allows the solder to gradually accelerate its flow and quickly enter the transition section 231b. When it enters the outlet section 231c, the smaller cross-sectional area of ​​the outlet section 231c reduces the inner diameter of the hole, allowing the solder to flow out more rapidly. This ensures that the solder can stably bond the cathode foil and anode foil to the clamping piece 2311, guaranteeing the normal operation of the aluminum electrolytic capacitor 10.

[0051] In one implementation, please refer to Figures 1 to 4 The aluminum electrolytic capacitor 10 also includes a heat sink 3. Multiple heat sinks 3 are provided and are disposed in the mounting cavity 11 and surround the outer peripheral wall of the core package 2. Both ends of each heat sink 3 protrude from the outer shell 1.

[0052] In this embodiment, the aluminum electrolytic capacitor 10 also includes a heat sink 3. Multiple heat sinks 3 are provided and are disposed in the mounting cavity 11. The multiple heat sinks 3 are spaced apart and surround the outer peripheral wall of the core package 2. Both ends of each heat sink 3 protrude from the outer shell 1. Thus, the heat generated on the core package 2 can be transferred to the heat sink 3 and then to the external environment through the heat sink 3. The heat dissipation speed is fast, which can effectively reduce the internal temperature of the aluminum electrolytic capacitor 10 during use. The heat dissipation effect is good, which can improve the capacitor's ability to withstand large ripple current and extend the capacitor's life.

[0053] In one implementation, please refer to Figures 1 to 4 Each heat sink 3 includes a heat absorption section 31 and a heat dissipation section 32 connected to each other. The heat absorption section 31 is disposed in the mounting cavity 11 and attached to the outer peripheral wall of the core package 2. The heat dissipation section 32 is disposed outside the outer shell 1. The heat generated by the core package 2 is conducted to the outside of the outer shell 1 through the heat absorption section 31 and the heat dissipation section 32 in sequence.

[0054] In this embodiment, to facilitate the connection between the heat sink 3 and the core package 2, each heat sink 3 includes a heat absorption section 31 and a heat dissipation section 32 connected to each other. The heat absorption section 31 is disposed in the mounting cavity 11, and each heat absorption section 31 is attached to the outer peripheral wall of the core package 2. It should be noted that in order to increase the contact area between each heat absorption section 31 and the core package 2, the heat absorption section 31 is configured as a trapezoid, that is, the heat absorption section 31 has two oppositely arranged long sides and short sides. The long side of the heat absorption section 31 is attached to the outer peripheral wall of the core package 2, while the short side of the heat absorption section 31 is connected to the heat dissipation section 32.

[0055] It should be further noted that the heat dissipation section 32 can be solid or hollow.

[0056] The above description is merely an exemplary embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention specification and drawings under the technical concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. An aluminum electrolytic capacitor, characterized in that, The aluminum electrolytic capacitor includes: A housing, wherein a mounting cavity with a mounting opening is formed within the housing; A cover plate is provided on the mounting opening to seal the mounting cavity; A core package is installed in the mounting cavity. The core package includes an anode foil, a cathode foil, and two guide pins. One side of one guide pin is laser-welded to the anode foil, and the other side of one guide pin protrudes from the cover plate. The other guide pin is laser-welded to the cathode foil, and the other side of the guide pin protrudes from the cover plate. The guide needle includes an aluminum tongue and a lead wire. One side of the lead wire is connected to the aluminum tongue, and the other side of the lead wire passes through the cover plate. The aluminum tongue is inserted into the anode foil or the cathode foil on the side away from the lead wire. The aluminum tongue includes two opposing clamping pieces and an elastic element. The elastic element is disposed between the two clamping pieces and located on the side of the two clamping pieces near the lead wire, so as to bring the two clamping pieces closer to each other. The clamping pieces are laser welded to the cathode foil or the anode foil. Both clamping pieces are provided with clamping strips on their opposite sides, and the clamping strips are inclined toward the elastic member on the side away from the clamping pieces.

2. The aluminum electrolytic capacitor as described in claim 1, characterized in that, The aluminum tongue is flat.

3. The aluminum electrolytic capacitor as described in claim 1, characterized in that, The clamping strips are provided in multiples, and the multiple clamping strips are spaced apart on the side of the clamping piece.

4. The aluminum electrolytic capacitor as described in claim 3, characterized in that, Each of the clamping bars has a clamping protrusion on one side away from the clamping piece, and there are multiple clamping protrusions, which are spaced apart from each other on the clamping bar.

5. The aluminum electrolytic capacitor as described in any one of claims 1 to 4, characterized in that, The two clamping plates are also provided with a plurality of spaced drainage holes on their opposite sides, and the plurality of drainage holes are spaced apart between the two clamping strips.

6. The aluminum electrolytic capacitor as described in claim 5, characterized in that, Each of the drainage holes has an inlet section, a transition section, and an outlet section. The transition section is located between the inlet section and the outlet section. The cross-sectional area of ​​the inlet section is smaller than that of the transition section, and the cross-sectional area of ​​the transition section is larger than that of the outlet section.

7. The aluminum electrolytic capacitor as described in claim 1, characterized in that, The aluminum electrolytic capacitor also includes a heat sink, and there are multiple heat sinks disposed in the mounting cavity and surrounding the outer peripheral wall of the core package. Both ends of each heat sink protrude from the outer shell.

8. The aluminum electrolytic capacitor as described in claim 7, characterized in that, Each heat sink includes a heat absorption section and a heat dissipation section connected to each other. The heat absorption section is located inside the mounting cavity and is attached to the outer peripheral wall of the core package. The heat dissipation section is located outside the outer shell. The heat generated by the core package is conducted to the outside of the outer shell through the heat absorption section and the heat dissipation section in sequence.

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