Novel aluminum electrolytic capacitor

Abstract

The utility model discloses a novel aluminum electrolytic capacitor, which comprises an open metal shell, the bottom of which is provided with a hollow radiating tube; the top end of the hollow heat dissipation pipe is sealed with a core package, the hollow heat dissipation pipe is provided with a winding structure, and a reel hole is formed in the middle of the winding structure; the core package is arranged in the metal shell, and the hollow radiating tube is inserted into the reel hole; and the sealing element is arranged on the core bag and is connected in the opening side of the metal shell in an embedded manner. According to the novel aluminum electrolytic capacitor provided by the utility model, the hollow radiating tube with the closed top end is additionally arranged at the bottom of the metal shell, so that the reel hole in the core package can be directly inserted into the hollow radiating tube when the core package is assembled, and the hollow radiating tube not only realizes quick assembly of the core package and centered positioning of the core package, but also realizes quick assembly of the core package. And the core package is effectively fixed without shaking, so that the assembling stability is ensured, and meanwhile, high heat generated in the capacitor in a working state can be timely and effectively conducted out due to the hollow arrangement of the heat dissipation pipe.

Description

Technical Field

[0001] The utility model relates to the technical field of capacitors, in particular to a novel aluminum electrolytic capacitor. Background Art

[0002] Aluminum electrolytic capacitors have large capacitance, low price, and excellent performance, and they have a very high market share. General-purpose aluminum electrolytic capacitors are mainly wound aluminum containers. With the rapid upgrade and iteration of electronic equipment and the trend of miniaturization, there is a demand for miniaturization and high reliability for capacitors used in a large number of electronic equipment. For example, aluminum electrolytic capacitors used in automobiles are required to have shock resistance and heat dissipation performance, etc. At present, the existing capacitors can improve the shock resistance by filling glue in the shell, but the heat dissipation effect is general, or an aluminum shell sleeve is set outside the shell and a refrigerant medium is set in the closed cavity between the shell and the aluminum shell sleeve to achieve the heat dissipation effect, but the volume of the capacitor is significantly increased. Therefore, it is urgent to redesign an aluminum electrolytic capacitor that has both heat dissipation and shock resistance. Utility Model Content

[0003] Based on this, it is necessary to provide a new type of aluminum electrolytic capacitor to address the above technical problems. It has both anti-vibration and heat dissipation characteristics to ensure that the core package of the capacitor is stable and does not shake while the car is moving, and can dissipate the high heat generated by the capacitor in time, thereby solving the problem of damage to internal components of the capacitor due to shaking and unstable operation of the capacitor caused by high heat concentration, thereby improving the overall service life of the capacitor.

[0004] A novel aluminum electrolytic capacitor, comprising:

[0005] The open metal shell has a hollow heat dissipation tube at the bottom; the top of the hollow heat dissipation tube is closed.

[0006] The core package has a winding structure, and a reel hole is provided in the middle of the winding structure; the core package is placed in the metal shell, and the hollow heat dissipation tube is inserted into the reel hole;

[0007] A sealing member is arranged on the core package and is embedded and connected in the open side of the metal shell.

[0008] As a preferred implementation of the novel aluminum electrolytic capacitor provided by the utility model, the height of the hollow heat dissipation tube is not higher than the height of the reel hole.

[0009] As a preferred embodiment of the novel aluminum electrolytic capacitor provided by the utility model, the winding structure comprises a winding formed by winding a positive electrode foil and a negative electrode foil with insulating paper interposed therebetween, and a positive electrode lead and a negative electrode lead electrically connected to the positive electrode foil and the negative electrode foil respectively.

[0010] As a preferred embodiment of the new aluminum electrolytic capacitor provided by the utility model, along the axial direction of the winding, the lower end of the negative electrode foil protrudes downward from the lower end of the insulating paper, and the lower end of the positive electrode foil is higher than the lower end of the insulating paper; the lower end of the negative electrode foil is bent from the outside of the winding to the inside.

[0011] As a preferred implementation of the novel aluminum electrolytic capacitor provided by the utility model, an explosion-proof groove is provided at the bottom of the metal shell.

[0012] As a preferred implementation of the novel aluminum electrolytic capacitor provided by the utility model, the material of the metal shell is metal, stainless steel or alloy.

[0013] As a preferred implementation of the novel aluminum electrolytic capacitor provided by the utility model, heat dissipation ribs are arranged in the hollow heat dissipation tube.

[0014] As a preferred implementation of the novel aluminum electrolytic capacitor provided by the utility model, the heat dissipation ribs are spiral-shaped.

[0015] Compared with the prior art, the utility model has the following beneficial effects:

[0016] The novel aluminum electrolytic capacitor provided by the utility model has a hollow heat dissipation tube with a closed top added to the bottom of the metal shell, so that when assembling the core package, the reel hole on the core package can be directly inserted into the hollow heat dissipation tube. The hollow heat dissipation tube not only realizes the rapid assembly of the core package to make it centered, but also effectively fixes the core package without shaking to ensure the assembly stability. At the same time, the hollow setting of the heat dissipation tube can timely and effectively conduct the high heat generated inside the capacitor under the working state, without adding a complex structure to the capacitor and without significantly increasing the volume of the capacitor.

[0017] It should be understood that the above general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present invention.

[0018] In order to better understand and implement the present invention, the present invention is described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the scheme in the utility model, a brief introduction is given below to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 A three-dimensional diagram of a novel aluminum electrolytic capacitor provided by the utility model;

[0021] Figure 2 A top view of a metal shell in a novel aluminum electrolytic capacitor provided by the utility model;

[0022] Figure 3 for Figure 2 The sectional stereogram at AA in the middle;

[0023] Figure 4 A longitudinal section view of a novel aluminum electrolytic capacitor provided by the utility model;

[0024] Figure 5 for Figure 4 The enlarged schematic diagram of point B in the middle;

[0025] Figure 6 Another schematic diagram of the core package of the novel aluminum electrolytic capacitor provided by the utility model;

[0026] Figure 7 It is a bottom view of the heat pipe;

[0027] Figure 8 for Figure 7 Cross-sectional stereogram at CC in the middle. DETAILED DESCRIPTION

[0028] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

[0029] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiments of the utility model will be clearly and completely described below in conjunction with the accompanying drawings.

[0030] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features and technical solutions in the embodiments may be combined with each other.

[0031] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0032] Please refer to Figure 1-5 A novel aluminum electrolytic capacitor includes an open metal shell 1, a core package 2 built into the metal shell 1, and a sealing member 3 arranged on the core package 2 and embedded in the open side of the metal shell 1.

[0033] The material of the metal shell 1 can be metal, stainless steel, or alloy material. In this embodiment, high-purity aluminum is preferred. The metal shell 1 is an open structure, having a bottom 11 and a side tube extending vertically upward along the circumference of the bottom 11, and the bottom 11 and the side tube form a receiving cavity. A hollow heat dissipation pipe 12 is provided at the center of the inner side of the bottom 11 of the metal shell 1, and at least the top end (the side away from the bottom 11) is in a closed state.

[0034] The core package 2 has a winding structure, which includes a winding member formed by winding a positive electrode foil 22 and a negative electrode foil 23 between insulating paper 24, and a positive electrode lead 25 and a negative electrode lead 26 electrically connected to the positive electrode foil 22 and the negative electrode foil 23, respectively. After the winding is completed, the winding core is pulled out to obtain a winding structure with a reel hole 21. When assembling the core package 2, the core package 2 is built into the metal shell 1, and the reel hole 21 is directly correspondingly inserted into the hollow heat dissipation tube 12 to quickly complete the positioning assembly.

[0035] The height of the hollow heat dissipation tube 12 is not higher than the height of the reel hole 21, and can be 1 / 2 of the height of the reel hole 21, or higher. The outer diameter of the hollow heat dissipation tube 12 is preferably equal to or slightly smaller than the diameter of the reel hole 21. With such a design, the hollow heat dissipation tube 12 can better position the core package 2 so that it will not shake when the capacitor is vibrated. Moreover, the wall surface of the hollow heat dissipation tube 12 is close to the reel hole 21 of the core package 2, which can effectively dissipate the high heat generated by the capacitor when it is working.

[0036] The seal 3 is a rubber plug having a wire hole. When it is sleeved on the core package 2, the positive lead 25 and the negative lead 26 of the core package 2 pass through the wire hole. When assembling the package, not only the metal shell 1 is waisted to fix the capacitor core package 2, but also after the seal 3 is nested in the metal shell 1, the edge of the open side is curled and tightly fastened to the upper surface of the seal 3, so that the core package 2 is encapsulated and fixed inside the aluminum electrolytic capacitor shell 1.

[0037] Furthermore, in order to facilitate quick plugging, the closed top end of the hollow heat dissipation tube 12 is chamfered to facilitate insertion of the guide shaft hole 21 .

[0038] For further information, please refer to Figure 6 , along the axial direction of the winding, the lower end of the negative electrode foil 23 protrudes downward from the lower end of the insulating paper 24, and the lower end of the positive electrode foil 22 is higher than the lower end of the insulating paper 24; the lower end of the negative electrode foil 23 is bent from the outside to the inside of the winding, so that the lower end of the negative electrode foil 23 is in contact with the metal shell 1, which helps to conduct heat to the metal shell 1 and improve the heat dissipation effect; the bent lower ends of the negative electrode foils 23 are connected to each other through the metal shell, so that the negative electrode foils 23 are in a parallel structure, and the current path is short to reduce the electrical impedance and inductive reactance.

[0039] Furthermore, an explosion-proof groove (not shown in the figure) is provided at the bottom of the metal shell 1 to have an explosion-proof effect. When the core package 2 over-expands, the explosion-proof groove can release pressure to avoid explosion.

[0040] For further information, please refer to Figure 7 , 8 The hollow heat dissipation tube 12 is provided with heat dissipation ribs 14 to increase the heat dissipation area, and the heat exchange speed through the hollow heat dissipation tube 12 can be faster. Furthermore, the heat dissipation ribs 14 are spiral, which can be understood as extending along the axial direction of the hollow heat dissipation tube 12 to form a spiral shape, so that the airflow in the hollow heat dissipation tube 12 is discharged in a spiral manner, which makes it easier to take away the heat on the heat sink, resulting in a fast heat dissipation speed.

[0041] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] Obviously, the embodiments described above are only some embodiments of the utility model, rather than all embodiments. The preferred embodiments of the utility model are given in the accompanying drawings, but they do not limit the patent scope of the utility model. The utility model can be implemented in many different forms. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the utility model more thorough and comprehensive. Although the utility model is described in detail with reference to the aforementioned embodiments, for those skilled in the art, it is still possible to modify the technical solutions recorded in the aforementioned specific implementation methods, or to replace some of the technical features therein with equivalents. Any equivalent structure made using the contents of the utility model specification and the accompanying drawings, directly or indirectly used in other related technical fields, is also within the scope of patent protection of the utility model.

Claims

1. A novel aluminum electrolytic capacitor, characterized in that: It includes: An open metal shell with a hollow heat dissipation pipe at the bottom; The top end of the hollow heat dissipation pipe is closed; The core package has a winding structure, and a reel hole is provided in the middle of the winding structure; the core package is placed in the metal shell, and the hollow heat dissipation tube is inserted into the reel hole; A sealing member is arranged on the core package and is embedded and connected in the open side of the metal shell.

2. A novel aluminum electrolytic capacitor according to claim 1, characterized in that: The height of the hollow heat dissipation tube is not higher than the height of the reel hole.

3. A novel aluminum electrolytic capacitor according to claim 1, characterized in that: The winding structure comprises a winding member formed by winding a positive electrode foil and a negative electrode foil with insulating paper interposed therebetween, and a positive electrode lead and a negative electrode lead electrically connected to the positive electrode foil and the negative electrode foil respectively.

4. A novel aluminum electrolytic capacitor according to claim 3, characterized in that: Along the axial direction of the winding, the lower end of the negative electrode foil protrudes downward from the lower end of the insulating paper, and the lower end of the positive electrode foil is higher than the lower end of the insulating paper; the lower end of the negative electrode foil is bent from the outer side to the inner side of the winding.

5. A novel aluminum electrolytic capacitor according to claim 1, characterized in that: An explosion-proof groove is arranged at the bottom of the metal shell.

6. A novel aluminum electrolytic capacitor according to claim 1, characterized in that: The metal shell is made of metal, stainless steel or alloy.

7. A novel aluminum electrolytic capacitor according to claim 1, characterized in that: Heat dissipation ribs are arranged in the hollow heat dissipation pipe.

8. A novel aluminum electrolytic capacitor according to claim 7, characterized in that: The heat dissipation ribs are spiral-shaped.

Images