A button type aluminum electrolytic capacitor

Abstract

A button type aluminum electrolytic capacitor comprises an upper pole shell, a lower pole shell and a core package; the upper pole shell and the lower pole shell are extruded and sealed by an insulating sealing ring and are electrically isolated, and a cavity accommodating the core package is formed between the upper pole shell and the lower pole shell; an anode foil strip on the core package is electrically connected with the upper pole shell or the lower pole shell, and a corresponding cathode foil strip on the core package is electrically connected with the lower pole shell or the upper pole shell. The aluminum electrolytic capacitor is in a button type and can meet the use in a highly limited scene; meanwhile, the sealing effect between the upper pole shell and the lower pole shell is good, and the sealing ring is not easy to fall off from the lower pole shell, thereby facilitating the assembly of the button type aluminum electrolytic capacitor.

Description

Technical Field

[0001] This utility model relates to an aluminum electrolytic capacitor, and more particularly to a button-type aluminum electrolytic capacitor. Background Technology

[0002] Currently, most aluminum electrolytic capacitors are cylindrical, which are relatively tall and unsuitable for use in height-restricted environments. To address these limitations, modern aluminum electrolytic capacitors are typically made shorter, but still retain leads or external terminals, making installation inconvenient. Button-type aluminum electrolytic capacitors are not yet available on the market. Utility Model Content

[0003] The technical problem to be solved by this utility model is to overcome the shortcomings of the prior art and provide a button-type aluminum electrolytic capacitor, thereby meeting the requirements for use in space-constrained situations.

[0004] To solve the above-mentioned technical problems, the technical solution proposed by this utility model is as follows: a button-type aluminum electrolytic capacitor, comprising an upper electrode shell, a lower electrode shell, and a core; the upper electrode shell and the lower electrode shell are sealed by an insulating sealing ring and electrically isolated, and a cavity for accommodating the core is formed between the upper electrode shell and the lower electrode shell; the anode conductive foil strip on the core is electrically connected to the upper electrode shell or the lower electrode shell, and the corresponding cathode conductive foil strip on the core is electrically connected to the lower electrode shell or the upper electrode shell.

[0005] In the aforementioned button-type aluminum electrolytic capacitor, preferably, the insulating sealing ring includes an inner wall and an outer wall; a connecting groove is formed between the inner wall and the outer wall to connect with the side wall of the lower electrode shell; the side wall of the lower electrode shell is sealed to both the inner wall and the outer wall within the connecting groove; the lower electrode shell and the upper electrode shell are pressed together to seal the outer wall.

[0006] In the aforementioned button-type aluminum electrolytic capacitor, preferably, the tops of the inner wall and the outer wall are connected by a connecting part to form a whole; a first arc-shaped part is provided on the side of the connecting part near the inner wall.

[0007] Preferably, in the above-mentioned button-type aluminum electrolytic capacitor, the connecting part has a second arc-shaped portion on the side near the outer wall.

[0008] Preferably, in the above-mentioned button-type aluminum electrolytic capacitor, a stepped fixing position is formed at the lower part of the lower electrode shell or a stepped fixing position is formed on the side edge of the bottom of the lower electrode shell; the bottom of the outer wall overlaps the fixing position.

[0009] In the aforementioned button-type aluminum electrolytic capacitor, preferably, the open end of the upper electrode shell sidewall is rolled inward and overlapped with the outer wall of the fixed position.

[0010] In the aforementioned button-type aluminum electrolytic capacitor, preferably, the top of the lower electrode shell sidewall is bent downwards by 180 degrees to form a fixed position.

[0011] Preferably, in the above-mentioned button-type aluminum electrolytic capacitor, the core package includes an anode foil, electrolytic paper, and a cathode foil, and an anode conductive foil strip and a cathode conductive foil strip are riveted to the anode foil and the cathode foil, respectively; after the anode foil, electrolytic paper, and cathode foil are wound into a core package, the anode conductive foil strip and the cathode conductive foil strip are located at both ends of the core package.

[0012] In the aforementioned button-type aluminum electrolytic capacitor, preferably, the width of the electrolytic paper is greater than the width of the anode foil or cathode foil, and after the anode foil, electrolytic paper, and cathode foil are wound into a core package, the electrolytic paper extends beyond both ends of the core package.

[0013] Preferably, in the above-mentioned button-type aluminum electrolytic capacitor, the core is provided with insulating paper between the upper electrode shell and the lower electrode shell, and the anode conductive foil and the cathode conductive foil pass through the insulating paper and are electrically connected to the upper electrode shell or the lower electrode shell respectively.

[0014] Preferably, in the aforementioned button-type aluminum electrolytic capacitor, the anode and cathode conductive foil strips are electrically connected to the upper or lower electrode shell via welding or conductive adhesive.

[0015] Compared with the prior art, the advantages of this utility model are as follows: the aluminum electrolytic capacitor of this utility model is button-shaped, which can meet the needs of use in scenarios with limited height; at the same time, the sealing effect between the upper and lower electrode shells of this utility model is good, and the insulating sealing ring is not easy to fall off from the lower electrode shell, thus facilitating the assembly of the button-shaped aluminum electrolytic capacitor. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the assembly structure of the button-type aluminum electrolytic capacitor in Example 1.

[0017] Figure 2 This is a front view structural diagram of the core package in Example 1.

[0018] Figure 3 This is a cross-sectional view of the lower electrode shell in Example 1.

[0019] Figure 4 for Figure 3 A magnified structural diagram of point A in the middle.

[0020] Figure 5 This is a schematic diagram of the fixed position formed by thickening the upper part of the lower electrode shell sidewall in Example 1.

[0021] Figure 6 This is a schematic diagram of the fixed position formed by bending the top of the lower electrode shell sidewall downward in Example 1.

[0022] Figure 7 This is a schematic diagram of the structure with a gap at the fixed position in Example 1.

[0023] Figure 8 This is a schematic diagram of one structure of the sealing ring in Example 1.

[0024] Figure 9 This is a schematic diagram of the core package after it has been unfolded in Example 1.

[0025] Figure 10 This is a schematic diagram of the structure in Example 1 where the core package has isolation paper at both ends.

[0026] Figure 11 This is a schematic diagram of the connection structure between the upper and lower pole shells in Example 2.

[0027] Legend

[0028] 1. Upper electrode shell; 2. Lower electrode shell; 21. Fixing position; 3. Core package; 31. Anode foil; 32. Electrolytic paper; 33. Cathode foil; 34. Winding hole; 4. Insulating sealing ring; 41. Inner wall; 42. Outer wall; 43. First arc-shaped part; 44. Second arc-shaped part; 5. Anode conductive foil strip; 6. Cathode conductive foil strip; 7. Isolating paper. Detailed Implementation

[0029] To facilitate understanding of this utility model, it will be described more comprehensively and in detail below with reference to the accompanying drawings and preferred embodiments. However, the scope of protection of this utility model is not limited to the following specific embodiments.

[0030] It should be noted that when a component is described as being "fixed to, attached to, connected to or connected to" another component, it is used to indicate that the component is indirectly fixed to, attached to, connected to or connected to another component.

[0031] Unless otherwise defined, all technical terms used herein have the same meaning as commonly understood by those skilled in the art. The technical terms used herein are for the purpose of describing particular embodiments only and are not intended to limit the scope of protection of this invention. Example 1

[0032] like Figure 1 The illustrated button-type aluminum electrolytic capacitor includes an upper shell 1, a lower shell 2, and a core 3. The upper shell 1 and the lower shell 2 are sealed and electrically isolated by an insulating sealing ring 4, and a cavity is formed between the upper shell 1 and the lower shell 2 to accommodate the core 3. In this embodiment, as shown... Figure 2As shown, the anode conductive foil 5 on the core package 3 is electrically connected to the upper electrode shell 1, and the corresponding cathode conductive foil 6 on the core package 3 is electrically connected to the lower electrode shell 2; that is, the upper electrode shell 1 serves as the anode of the aluminum electrolytic capacitor, while the lower electrode shell 2 serves as the cathode of the aluminum electrolytic capacitor. In other embodiments, the anode conductive foil 5 on the core package 3 may be electrically connected to the lower electrode shell 2, and the corresponding cathode conductive foil 6 on the core package 3 may be electrically connected to the upper electrode shell 1.

[0033] like Figure 3 and Figure 4 As shown, the insulating sealing ring 4 includes an inner wall 41 and an outer wall 42; a connecting groove is formed between the inner wall 41 and the outer wall 42 to connect with the side wall of the lower electrode shell 2; the side wall of the lower electrode shell 2 is sealed to both the inner wall 41 and the outer wall 42 within the connecting groove; the lower electrode shell 2 and the upper electrode shell 1 are sealed by pressing the outer wall 42 together. The tops of the inner wall 41 and the outer wall 42 are connected by a connecting part to form a whole; a first arc-shaped part 43 is provided on the side of the connecting part near the inner wall 41. To facilitate the upper electrode shell 1 to be smoothly fastened onto the lower electrode shell 2, the tops of the inner wall 41 and the outer wall 42 can be connected by a connecting part to form a whole; a second arc-shaped part 44 is provided on the side of the connecting part near the outer wall 42.

[0034] In this embodiment, the insulating sealing ring 4 can be made of silicone resin, liquid rubber, or UV-curable elastic resin. It is formed before curing; because it is uncured, it is relatively soft. The side wall of the lower electrode shell 2 is inserted into the connecting groove of the insulating sealing ring 4, so that the fixing position 421 of the outer wall 42 rests on the overlapping step 21 of the lower electrode shell 2. After curing, the insulating sealing ring 4 hardens, thereby fixing it to the lower electrode shell 2. Curing the insulating sealing ring 4 can be achieved by heat curing, or by spraying a curing agent onto the surface of the insulating sealing ring 4 followed by heat curing; if the insulating sealing ring 4 is made of UV-curable elastic resin, it can also be cured by ultraviolet irradiation.

[0035] In this embodiment, when the insulating sealing ring 4 is formed, silicone resin, liquid rubber or UV-curable elastic resin can also be injected into a mold with the lower electrode shell 2 fixed in advance, and then heated and cured.

[0036] In this embodiment, as Figure 5As shown, the fixing position 21 is formed by thickening the upper part of the side wall of the lower electrode shell 2, thereby forming a stepped fixing position 21 in the lower middle part of the side wall of the lower electrode shell 2. The outer wall of the insulating sealing ring 4 extends downward 42 and overlaps the fixing position 21, completely covering the fixing position 21 on the lower electrode shell; after the insulating sealing ring 4 is cured, it is firmly bonded to the side wall of the lower electrode shell 2. After the upper electrode shell 1 covers the lower electrode shell 2 and presses the outer wall 42 of the insulating sealing ring 4, the bottom of the upper electrode shell 1, that is, the open end of the upper electrode shell 1, is rolled inward, thereby overlapping the outer wall 42 of the fixing position 21, but the upper electrode shell 1 does not contact the lower electrode shell 2, thereby achieving the purpose of tight fastening.

[0037] In this embodiment, as Figure 6 As shown, the fixing position 21 can also be formed by bending the top of the side wall of the lower electrode shell 2 downwards by 180 degrees. In this form, the top of the side wall of the lower electrode shell 2 bends downwards by 180 degrees, creating a hanging opening. This makes the hanging opening more securely fixed to the outer wall of the insulating sealing ring after the insulating sealing ring 4 has cured. In this embodiment, after the top of the side wall of the lower electrode shell is bent downwards by 180 degrees, the bent top can be in close contact with the side wall; alternatively, it can be formed as follows: Figure 7 As shown, there is a certain gap; when the fixing position has a certain gap, when the material for making the insulating sealing ring 4 is injected into the mold, silicone resin, liquid rubber or UV-cured elastic resin will flow into the gap. After heating and curing, the insulating sealing ring is completely fixed on the lower electrode shell 2.

[0038] In this embodiment, as Figure 8 As shown, the bottom of the insulating sealing ring 4 extends all the way to the bottom of the lower electrode shell 2, but the fixing position 21 is not filled in. Thus, the insulating sealing ring 4 retains the step shape of the fixing position at the fixing position. The opening end of the upper electrode shell, that is, the upper electrode shell 1, is rolled inward, so as to overlap the outer wall of the fixing position 21. However, the upper electrode shell 1 does not contact the lower electrode shell 2, thereby achieving the purpose of tight fastening.

[0039] In this embodiment, after the insulating sealing ring 4 is cured, the outer diameter of the insulating sealing ring 4 in the lower electrode shell 2 is equal to the inner diameter of the side wall of the upper electrode shell 1, or the outer diameter of the insulating sealing ring 4 in the lower electrode shell 2 is slightly larger than the inner diameter of the side wall of the upper electrode shell 1. In this way, after the lower electrode shell 2 is fastened onto the lower electrode shell 2, the side wall of the upper electrode shell 1 and the side wall of the lower electrode shell 2 compress the outer wall 42 of the insulating sealing ring 4 to compress and seal, and also to provide insulation.

[0040] In this embodiment, as Figure 9As shown, the core package 3 includes an anode foil 31, electrolytic paper 32, and a cathode foil 33. An anode conductor strip 5 and a cathode conductor strip 6 are riveted to the anode foil 31 and cathode foil 33, respectively. After the anode foil 31, electrolytic paper 32, and cathode foil 33 are wound into the core package 3, the anode conductor strip 5 and cathode conductor strip 6 are located at both ends of the core package 3. The anode conductor strip 5 and cathode conductor strip 6 are electrically connected to the upper electrode shell 1 or the lower electrode shell 2 by welding or conductive adhesive.

[0041] In this embodiment, the anode foil 5 is located at the upper end of the core package 3, and is electrically connected to the upper electrode shell 1; the cathode foil 6 is located at the lower end of the core package 3, and is electrically connected to the lower electrode shell 2. When the cathode foil 6 and the lower electrode shell 2 are connected by welding, laser welding can be used; if the core package 3 obstructs the welding operation, the welding needle of the laser welding can be passed through the winding hole 34 of the core package 3 to weld the cathode foil 6 into the lower electrode shell 2, with the welding position located at the position of the lower electrode shell 2 corresponding to the winding hole 34.

[0042] In this embodiment, there are generally two methods to separate the anode conductive foil 5 and the cathode conductive foil 6 from the core package 3. For example... Figure 9 As shown, in the first method, the width of the electrolytic paper 32 is greater than the width of the anode foil 31 or the cathode foil 33. After the anode foil 31, electrolytic paper 32, and cathode foil 33 are wound into a core package 3, the electrolytic paper 32 extends beyond both ends of the core package 3. Thus, after the upper electrode shell 1 and the lower electrode shell 2 are fastened, the anode conductive foil strip 5 and the cathode conductive foil strip 6 are bent, and the electrolytic paper 32 extending out of the core package 3 will separate the anode conductive foil strip 5 and the cathode conductive foil strip 6 from the core package 3, thereby preventing a short circuit. Figure 10 As shown, in the second type, a separating paper 7 is provided between the core package 3 and both the upper electrode shell 1 and the lower electrode shell 2. The anode conductive foil 5 and the cathode conductive foil 6 pass through the separating paper 7 and are electrically connected to the upper electrode shell 1 or the lower electrode shell 2, respectively. The separating paper 7 can be made of electrolytic paper 32.

[0043] The aluminum electrolytic capacitor in this embodiment is button-shaped, which can meet the needs of use in scenarios with limited height. At the same time, the sealing effect between the upper electrode shell 1 and the lower electrode shell 2 in this utility model is good, and the insulating sealing ring 4 is not easy to fall off from the lower electrode shell 2, thus facilitating the assembly of the button-shaped aluminum electrolytic capacitor. Example 2

[0044] In this embodiment, as Figure 11As shown, a stepped fixing position 21 is formed on the bottom side edge of the lower electrode shell 2. The outer wall of the insulating sealing ring 4 extends downward 42 and overlaps the fixing position 21, so that the outer wall 42 completely covers the side wall of the lower electrode shell 2 on the outside; after the insulating sealing ring 4 is cured, the insulating sealing ring 4 is firmly bonded to the side wall and bottom of the lower electrode shell 2. In this embodiment, the outer wall 42 can completely cover the fixing position 21 on the lower electrode shell 2. After the upper electrode shell 1 covers the lower electrode shell 2 and presses the outer wall 42 of the insulating sealing ring 4, the bottom of the upper electrode shell 1, that is, the open end of the upper electrode shell 1, rolls inward, thereby overlapping the outer wall 42 on the fixing position 21, but the upper electrode shell 1 does not contact the lower electrode shell 2, thereby achieving the purpose of tight fastening. Figure 11 As shown, in this embodiment, the fixing position 32 is formed by thickening the middle part of the lower electrode shell 2, thereby forming a stepped fixing position 21 on the bottom side edge of the lower electrode shell 2.

[0045] The other parts of this embodiment are the same as those in Embodiment 1.

Claims

1. A button-type aluminum electrolytic capacitor, characterized in that: It includes an upper electrode shell, a lower electrode shell, and a core package; the upper electrode shell and the lower electrode shell are sealed by an insulating sealing ring and electrically isolated, and a cavity is formed between the upper electrode shell and the lower electrode shell to accommodate the core package; the anode conductive foil strip on the core package is electrically connected to the upper electrode shell or the lower electrode shell, and the corresponding cathode conductive foil strip on the core package is electrically connected to the lower electrode shell or the upper electrode shell.

2. The button-type aluminum electrolytic capacitor according to claim 1, characterized in that: The insulating sealing ring includes an inner wall and an outer wall; a connecting groove is formed between the inner wall and the outer wall to connect with the side wall of the lower electrode shell; the side wall of the lower electrode shell is sealed to both the inner wall and the outer wall within the connecting groove; the lower electrode shell and the upper electrode shell are pressed together to seal the outer wall.

3. The button-type aluminum electrolytic capacitor according to claim 2, characterized in that: The tops of the inner wall and the outer wall are connected by a connecting part to form a whole; a first arc-shaped part is provided on the side of the connecting part near the inner wall.

4. The button-type aluminum electrolytic capacitor according to claim 3, characterized in that: A second arc-shaped portion is provided on the side of the connecting part near the outer wall.

5. The button-type aluminum electrolytic capacitor according to claim 2, characterized in that: The lower part of the lower electrode shell has a stepped fixing position, or the side edge of the bottom of the lower electrode shell has a stepped fixing position; the bottom of the outer wall overlaps the fixing position.

6. The button-type aluminum electrolytic capacitor according to claim 5, characterized in that: The open end of the upper pole shell sidewall is rolled inward at the fixed position and overlaps the outer wall at the fixed position.

7. The button-type aluminum electrolytic capacitor according to claim 5, characterized in that: The top of the lower pole shell sidewall is bent downwards by 180 degrees to form a fixed position.

8. The button-type aluminum electrolytic capacitor according to claim 1, characterized in that: The core package includes an anode foil, electrolytic paper, and a cathode foil, with an anode guide foil strip and a cathode guide foil strip riveted to the anode foil and cathode foil respectively; after the anode foil, electrolytic paper, and cathode foil are wound into a core package, the anode guide foil strip and the cathode guide foil strip are located at both ends of the core package respectively.

9. The button-type aluminum electrolytic capacitor according to claim 8, characterized in that: The width of the electrolytic paper is greater than the width of the anode foil or cathode foil. After the anode foil, electrolytic paper and cathode foil are wound into a core package, the electrolytic paper extends out from both ends of the core package.

10. The button-type aluminum electrolytic capacitor according to claim 8, characterized in that: The core package is provided with isolation paper between itself and the upper and lower electrode shells. The anode and cathode conductive foils pass through the isolation paper and are electrically connected to the upper or lower electrode shells, respectively.

Images