Aluminum electrolytic capacitor with relatively high current-carrying capacity
By using structures such as limiting rings, aluminum rods, T-shaped disks, and aluminum plates to fix and dissipate heat from the core of the aluminum electrolytic capacitor, the problem of core expansion caused by increased pressure on the aluminum shell is solved, maintaining high current carrying capacity and protecting the structural integrity of the capacitor.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- JIANGSU YILAI CAPACITOR CO LTD
- Filing Date
- 2024-12-30
- Publication Date
- 2026-05-05
AI Technical Summary
During long-term use, existing aluminum electrolytic capacitors experience thermal expansion of the core due to increased internal pressure in the aluminum casing. This leads to increased gaps between the anode foil, cathode foil, and electrolytic paper, reducing their current-carrying capacity.
The core package is fixed by a limiting ring and aluminum rod structure. The inner ring of the limiting ring binds the core package to prevent thermal expansion, and the aluminum rod improves stability. At the same time, heat dissipation is achieved through a T-shaped disk and aluminum plate to reduce the internal temperature of the aluminum shell. The explosion direction is controlled by a three-pronged groove and a semi-circular aluminum ball to prevent damage to the core package.
It effectively prevents the core from expanding under high temperature and pressure, maintains high current carrying capacity, and protects the capacitor through heat dissipation and explosion control structure, ensuring that the capacitor maintains high efficiency performance during long-term use.
Smart Images
Figure CN224203965U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of aluminum electrolytic capacitor technology, and in particular to an aluminum electrolytic capacitor with high current carrying capacity. Background Technology
[0002] Aluminum electrolytic capacitors are made by inserting a bent aluminum strip as the positive electrode into an aluminum cylinder containing liquid electrolyte as the negative electrode. They also require DC voltage treatment to form an oxide film on the positive electrode as the dielectric. Their characteristics include large capacitance, but also high leakage current, poor stability, and polarity. They are suitable for power supply filtering or low-frequency circuits. When using them, the positive and negative terminals must not be reversed.
[0003] During the winding or stacking process of the core package, the bonding between the anode foil, cathode foil, and electrolytic paper is made tighter, which can reduce the resistance of ions during transport and allow the charge to transfer more smoothly between the electrodes and the electrolyte, thereby improving the performance of the capacitor under high current. Existing core packages are usually placed directly in the aluminum shell. During long-term use, the increased internal pressure of the aluminum shell will cause the core package to thermally expand, resulting in an increase in the gap between the anode foil, cathode foil, and electrolytic paper, thereby reducing the current carrying capacity. Therefore, an aluminum electrolytic capacitor with higher current carrying capacity is proposed. Utility Model Content
[0004] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the present invention.
[0005] In view of the problems existing in the current aluminum electrolytic capacitor with high current carrying capacity, this utility model is proposed.
[0006] Therefore, the purpose of this utility model is to provide an aluminum electrolytic capacitor with high current carrying capacity, which is suitable for solving the problem that, during long-term use, the core of the capacitor will undergo thermal expansion due to the increase in internal pressure of the aluminum shell, resulting in an increase in the gap between the anode foil, cathode foil and electrolytic paper, thereby reducing the current carrying capacity.
[0007] To solve the above-mentioned technical problems, this utility model provides the following technical solution: an aluminum electrolytic capacitor with high current carrying capacity, comprising:
[0008] The carrier unit includes an aluminum shell and a sealing cap fixedly connected to the bottom of the inner cavity of the aluminum shell. Two guide pins penetrating the sealing cap are riveted to the bottom of the sealing cap. The inner cavity of the aluminum shell is provided with a core package.
[0009] The auxiliary unit includes two limiting rings fixedly connected to the inner wall of the aluminum shell. The two limiting rings are respectively sleeved on the top and bottom of the core package. The side walls of the two limiting rings are provided with multiple annularly distributed notches. The inner walls of the two limiting rings are cut with intercepting surfaces. The middle part of the inner ring of the limiting ring protrudes towards the center of the limiting ring.
[0010] In a preferred embodiment of the aluminum electrolytic capacitor with high current carrying capacity described in this utility model, multiple aluminum rods are fixedly connected between the opposing surfaces of the two limiting rings, and the multiple aluminum rods are distributed in a ring at equal intervals and in contact with the core package.
[0011] As a preferred embodiment of the aluminum electrolytic capacitor with high current carrying capacity described in this utility model, wherein: a T-shaped disk penetrating the sealing cover is fixedly connected to the bottom of the sealing cover, and both of the guide pins penetrate the T-shaped disk.
[0012] As a preferred embodiment of the aluminum electrolytic capacitor with high current carrying capacity described in this utility model, the top of the T-shaped disk is fixedly connected to multiple aluminum plates, each of which penetrates the sealing cap and is fixedly connected to the limiting ring located at the bottom.
[0013] In a preferred embodiment of the aluminum electrolytic capacitor with high current carrying capacity described in this utility model, the thickness of the top of the aluminum shell is less than the thickness of the side wall of the aluminum shell, and a three-pronged groove is formed on the top of the aluminum shell.
[0014] As a preferred embodiment of the aluminum electrolytic capacitor with high current carrying capacity described in this utility model, a plurality of semi-circular aluminum spheres are fixedly connected to the top of the aluminum shell, and the plurality of semi-circular aluminum spheres are divided into three groups and staggered from each other by the three-pronged slot.
[0015] The beneficial effects of this utility model are as follows: by inserting the core package into the inner ring of the two limiting rings, the core package is bound by the limiting rings and is difficult to thermally expand, thereby avoiding the increase of the gap between the anode foil, cathode foil and electrolytic paper, so that the capacitor can still maintain a high current carrying capacity during long-term use. Attached Figure Description
[0016] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Among them:
[0017] Figure 1 This is a schematic diagram of the overall structure of an aluminum electrolytic capacitor with high current carrying capacity proposed in this utility model.
[0018] Figure 2 This is a schematic diagram of the cross-sectional structure of the aluminum shell proposed in this utility model;
[0019] Figure 3 This is a schematic diagram of the core-packing structure proposed in this utility model;
[0020] Figure 4 This is a schematic diagram of the connection structure between the limiting ring and the aluminum rod proposed in this utility model;
[0021] Figure 5 This is a schematic diagram of the cross-sectional surface of the limiting ring proposed in this utility model;
[0022] Figure 6 This is a schematic diagram showing the positional relationship between the sealing cap and the T-shaped plate proposed in this utility model.
[0023] 101. Aluminum shell; 102. Sealing cap; 103. Guide pin; 104. Core package; 200. Auxiliary unit; 201. Limiting ring; 202. Notch; 203. Interception surface; 204. Aluminum rod; 205. T-shaped disk; 206. Aluminum plate; 207. Trident groove; 208. Semi-circular aluminum ball. Detailed Implementation
[0024] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the specific embodiments of this utility model will be described in detail below with reference to the accompanying drawings.
[0025] Many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Those skilled in the art can make similar extensions without departing from the spirit of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.
[0026] Secondly, the term "an embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single embodiment or an embodiment selectively excluded from other embodiments.
[0027] Secondly, this utility model is described in detail with reference to the schematic diagrams. When describing the embodiments of this utility model, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged, not adhering to the usual scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of this utility model. In addition, actual manufacturing should include the three-dimensional spatial dimensions of length, width, and depth.
[0028] Example
[0029] Reference Figures 1-6 As an embodiment of the present invention, an aluminum electrolytic capacitor with high current carrying capacity is provided, comprising: a carrying unit and an auxiliary unit 200;
[0030] The bearing unit includes an aluminum shell 101 and a sealing cap 102 fixedly connected to the bottom of the inner cavity of the aluminum shell 101. Two guide pins 103 that penetrate the sealing cap 102 are riveted to the bottom of the sealing cap 102. A core package 104 is provided in the inner cavity of the aluminum shell 101.
[0031] The auxiliary unit 200 includes two limiting rings 201 fixedly connected to the inner wall of the aluminum shell 101. The two limiting rings 201 are respectively sleeved on the top and bottom of the core package 104. The side walls of the two limiting rings 201 are provided with multiple annularly distributed notches 202. The inner walls of the two limiting rings 201 are cut with intercepting surfaces 203. The middle part of the inner ring of the limiting ring 201 protrudes towards the center of the limiting ring 201.
[0032] The bottom of the aluminum shell 101 is not sealed. The sealing cap 102 is used to seal the bottom opening of the aluminum shell 101. There is a gap between the core package 104 and the inner wall of the aluminum shell 101 to facilitate the flow of electrolyte. The core package 104 is made of anode foil, electrolytic paper and cathode foil that absorb electrolyte and are attached together and then wound into a cylindrical shape. The inner diameter of the limiting ring 201 matches the diameter of the core package 104 so that the core package 104 can be inserted into the inner ring of the two limiting rings 201. The two ends of the inner ring of the limiting ring 201 are beveled to facilitate the insertion of the core package 104 into the limiting ring 201. The inner diameter of the middle part of the limiting ring 201 is smaller than the inner diameter of its two ends, so that the core package 104 is bound by the limiting ring 201. Under the condition of increased pressure and temperature, the anode foil, electrolytic paper and cathode foil are restricted by the limiting ring 201 and thus cannot expand and unfold.
[0033] This allows the anode foil, electrolytic paper, and cathode foil to adhere tightly to each other, maintaining a high current-carrying capacity over a long period. The notch 202 allows the electrolyte to flow between the two limiting rings 201. Since the core package 104 is formed by winding, there is a raised section at least three layers thick at the end of the core package 104. The intercepting surface 203 contacts the raised section at the end of the core package 104, restricting the core package 104 by the intercepting surface 203. This facilitates fixing the position of the core package 104 during assembly, preventing it from sliding within the limiting rings 201.
[0034] In addition, multiple aluminum rods 204 are fixedly connected between the opposite faces of the two limiting rings 201. The multiple aluminum rods 204 are distributed in a ring at equal intervals and are in contact with the core package 104.
[0035] The aluminum rod 204 is used to improve the stability between the two limiting rings 201 and to limit the middle of the core package 104 to prevent thermal expansion of the core package 104. The aluminum rod 204 can limit the core package 104 with a smaller number of limiting rings 201, thereby reducing the manufacturing cost of the capacitor.
[0036] Furthermore, a T-shaped disc 205 is fixedly connected to the bottom of the sealing cover 102, penetrating the sealing cover 102. Two guide pins 103 both penetrate the T-shaped disc 205. Multiple aluminum plates 206 are fixedly connected to the top of the T-shaped disc 205. Each aluminum plate 206 penetrates the sealing cover 102 and is fixedly connected to the limiting ring 201 located at the bottom.
[0037] The T-shaped disk 205 is made of aluminum. The connection between the T-shaped disk 205 and the sealing cover 102 is sealed. When the guide pin 103 connects to the electrical component, the interior of the aluminum shell 101 is energized and the pressure increases, thereby generating heat. The T-shaped disk 205 can conduct the heat inside the aluminum shell 101 to the outside of the aluminum shell 101, thereby helping the aluminum shell 101 to dissipate heat, reduce the temperature of the aluminum shell 101 and maintain a high current carrying capacity.
[0038] The limiting ring 201 is also made of aluminum. The heat inside the aluminum shell 101 is transferred to the two limiting rings 201 and the multiple aluminum rods 204. The heat between the two limiting rings 201 is transferred through the aluminum rods 204. The aluminum plate 206 can transfer the heat of the limiting rings 201 to the T-shaped plate 205, so that the heat inside the aluminum shell 101 can be transferred to the outside through the T-shaped plate 205, thereby achieving a good cooling effect.
[0039] Furthermore, the thickness of the top of the aluminum shell 101 is less than the thickness of the side wall of the aluminum shell 101. A three-pronged groove 207 is provided on the top of the aluminum shell 101. Multiple semi-circular aluminum balls 208 are fixedly connected to the top of the aluminum shell 101. The multiple semi-circular aluminum balls 208 are divided into three groups and are staggered from each other by the three-pronged groove 207.
[0040] The triangular groove 207 is used for pressure relief. When the internal pressure of the aluminum shell 101 is too high, the pressure will break through the top of the aluminum shell 101, causing the top of the aluminum shell 101 to split into three pieces along the triangular groove 207. This can control the direction of the explosion of the aluminum shell 101, so that the limiting ring 201 remains inside the aluminum shell 101 and limits the core package 104 to prevent the core package 104 from being blown open. The triangular groove 207 divides the top of the aluminum shell 101 into three equal parts, and multiple semi-circular aluminum balls 208 are located in three equal parts on the top of the aluminum shell 101. The semi-circular aluminum balls 208 can increase the strength of the top of the aluminum shell 101, so that when the aluminum shell 101 explodes, the top of the aluminum shell 101 can be blown into three pieces evenly, thereby avoiding the top of the aluminum shell 101 being blown into pieces and reducing the generation of fragments.
[0041] During use, during assembly, the core package 104 needs to be inserted into the inner rings of the two limiting rings 201, and its intercepting surface 203 needs to contact the raised end of the core package 104 to fix the position of the core package 104. Then, the aluminum shell 101 is sealed by the sealing cap 102. When the internal pressure and temperature of the aluminum shell 101 increase, the anode foil, electrolytic paper and cathode foil are restricted by the limiting rings 201 and cannot expand. This makes the anode foil, electrolytic paper and cathode foil stick together to maintain a high current carrying capacity for a long time. When the guide pin 103 connects to electrical components, the heat inside the aluminum shell 101 is transferred to the two limiting rings 201 and the multiple aluminum rods 204.
[0042] The aluminum plate 206 can transfer the heat from the limiting ring 201 and the aluminum rod 204 to the T-shaped disk 205, so that the heat inside the aluminum shell 101 can be transferred to the outside through the T-shaped disk 205, thereby achieving a good cooling effect, reducing the temperature of the aluminum shell 101 and maintaining a high current-carrying state. When the internal pressure of the aluminum shell 101 is too high, the pressure will break through the top of the aluminum shell 101, causing the top of the aluminum shell 101 to split into three pieces along the triangular groove 207. This can control the direction of the explosion of the aluminum shell 101. The semi-circular aluminum ball 208 can make the top of the aluminum shell 101 be evenly blown into three pieces, thereby reducing the generation of fragments.
[0043] It should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solution of this utility model without departing from the spirit and scope of the technical solution of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.
Claims
1. An aluminum electrolytic capacitor with high current carrying capacity, characterized in that, include: The carrier unit includes an aluminum shell (101) and a sealing cap (102) fixedly connected to the bottom of the inner cavity of the aluminum shell (101). Two guide pins (103) are riveted to the bottom of the sealing cap (102) and a core package (104) is provided in the inner cavity of the aluminum shell (101). The auxiliary unit (200) includes two limiting rings (201) fixedly connected to the inner wall of the aluminum shell (101). The two limiting rings (201) are respectively sleeved on the top and bottom of the core package (104). The side walls of the two limiting rings (201) are provided with multiple annularly distributed notches (202). The inner walls of the two limiting rings (201) are cut with intercepting surfaces (203). The middle part of the inner ring of the limiting ring (201) protrudes towards the center of the limiting ring (201).
2. The aluminum electrolytic capacitor with high current carrying capacity according to claim 1, characterized in that: Multiple aluminum rods (204) are fixedly connected between the opposite faces of the two limiting rings (201), and the multiple aluminum rods (204) are distributed in a ring at equal intervals and are in contact with the core package (104).
3. An aluminum electrolytic capacitor with high current carrying capacity according to claim 1, characterized in that: The bottom of the sealing cap (102) is fixedly connected to a T-shaped disk (205) that penetrates the sealing cap (102), and both of the guide pins (103) penetrate the T-shaped disk (205).
4. An aluminum electrolytic capacitor with high current carrying capacity according to claim 3, characterized in that: The top of the T-shaped disc (205) is fixedly connected to multiple aluminum plates (206), each of which penetrates the sealing cap (102) and is fixedly connected to the limiting ring (201) located at the bottom.
5. An aluminum electrolytic capacitor with high current carrying capacity according to claim 1, characterized in that: The thickness of the top of the aluminum shell (101) is less than the thickness of the side wall of the aluminum shell (101), and a three-pronged groove (207) is provided on the top of the aluminum shell (101).
6. An aluminum electrolytic capacitor with high current carrying capacity according to claim 5, characterized in that: The top of the aluminum shell (101) is fixedly connected to a plurality of semi-circular aluminum balls (208), which are divided into three groups and staggered from each other by the triangular groove (207).