Aluminum electrolytic capacitor with built-in fuse

Abstract

The utility model provides an aluminum electrolytic capacitor with a built-in fuse, the aluminum electrolytic capacitor comprises a housing, a capacitor core, a fuse, a positive electrode leading-out terminal, a negative electrode leading-out terminal and a core welding terminal, the capacitor core comprises a single-chip core, and the single-chip core comprises a negative electrode end, an isolation rubber line and a positive electrode end; the negative electrode end of the single-chip core is connected to the negative electrode leading-out terminal, and the positive electrode end of the single-chip core is connected to the core welding terminal; one end of the fuse is connected with the core welding terminal, and the other end of the fuse is connected with the anode leading-out terminal; all the parts are connected and then packaged through an injection molding material to form a shell, and a positive electrode leading-out terminal and a negative electrode leading-out terminal are led out from the shell; the positive electrode end of the single core is welded on the core welding terminal in an overlapping manner; the negative electrode end of the single-chip core is adhered to the overlapping area of the negative electrode leading-out terminal through a conductive adhesive; the conductive adhesive is conductive silver adhesive; and the isolation rubber wire is arranged between the negative electrode end and the positive electrode end.

Description

Technical Field

[0001] The utility model relates to the field of aluminum electrolytic capacitors, in particular to an aluminum electrolytic capacitor with a built-in fuse. Background Art

[0002] At present, in pulse charge and discharge circuits, multiple chip-type laminated solid aluminum electrolytic capacitors are usually connected in parallel to form a module, and multiple modules are connected in parallel to work together. When individual chip-type laminated solid aluminum electrolytic capacitors in a module in the circuit fail due to short circuit, they are prone to overheating or burn. In order not to affect the operation of the remaining chip-type laminated solid aluminum electrolytic capacitors in the module, it is usually necessary to add an additional insurance circuit during design and use, and use the fuse's fusing characteristics to make the problematic chip-type laminated solid aluminum electrolytic capacitor in the circuit in an open circuit state. However, adding an additional insurance circuit not only requires matching the insurance circuit components with the capacitor, but also increases the circuit space and reduces production efficiency. Utility Model Content

[0003] The utility model aims to solve one of the technical problems in the related art at least to a certain extent:

[0004] To this end, the utility model provides an aluminum electrolytic capacitor with a built-in fuse, the aluminum electrolytic capacitor comprising: a shell, a capacitor core, a fuse, a positive lead terminal, a negative lead terminal and a core welding terminal, wherein the capacitor core comprises a single-piece core, and the single-piece core comprises a negative terminal, an isolation rubber wire and a positive terminal;

[0005] The negative terminal of the single-piece core is connected to the negative lead-out terminal, and the positive terminal is connected to the core welding terminal;

[0006] One end of the fuse is connected to the core welding terminal, and the other end is connected to the positive electrode lead-out terminal.

[0007] The aluminum electrolytic capacitor provided by the utility model occupies a very small volume, and has substantially the same capacity as ordinary aluminum electrolytic capacitors of the same volume. In actual circuits, when individual capacitors fail due to short circuit, the internal fuse will be blown, thereby changing the capacitor to an open circuit failure mode with a lower degree of danger, thus avoiding burning of circuit boards or other electronic components due to short circuit.

[0008] In some embodiments of the present invention, the number of the capacitor core is at least one.

[0009] Specifically, the number of capacitor cores is 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, and so on.

[0010] In some embodiments of the present invention, the number of the fuses is 1 to 4.

[0011] Specifically, the number of the fuses is 1, 2, 3, or 4. Considering the volume of the aluminum electrolytic capacitor, the upper limit of the number of fuses is set to 4, and in actual use, it can be adjusted as needed.

[0012] In some embodiments of the utility model, after the components are connected, they are packaged by injection molding material to form a shell, and the positive electrode lead terminal and the negative electrode lead terminal are led out from the shell.

[0013] In some embodiments of the present invention, the injection molding material is one or more of epoxy resin, phenolic resin, silicone resin or unsaturated polyester.

[0014] In some embodiments of the present invention, the positive end of the single-piece core is overlapped and welded on the core welding terminal.

[0015] In some embodiments of the present invention, the negative terminal of the single-piece core is bonded to the overlapping area of ​​the negative electrode lead terminal by conductive adhesive.

[0016] In some embodiments of the present invention, the conductive glue is conductive silver glue.

[0017] In some embodiments of the present invention, the isolation rubber line is arranged between the negative terminal and the positive terminal.

[0018] The utility model is realized by the following technical scheme: the utility model designs a lead frame, which is convenient for realizing the mass production of aluminum electrolytic capacitors with built-in fuses; one or more single-chip cores are overlapped on the lead frame, the negative terminal of the single-chip core is bonded to the overlapping area of ​​the negative lead terminal through conductive glue, and the positive terminal of the single-chip core is connected to the core welding terminal; one end of 1 to 4 fusible fuses is connected to the core welding terminal, and the other end is connected to the positive lead terminal to form the capacitor body. After the components of the capacitor body are connected, they are packaged by injection molding material to form a sealed protective shell, and then the positive lead terminal, the negative lead terminal, and the core welding terminal are punched off from the lead frame by a cutting device, and then the positive lead terminal and the negative lead terminal are bent into a shape that is convenient for surface mounting by a bending foot forming device, so as to obtain the aluminum electrolytic capacitor with built-in fuse described in the utility model.

[0019] The beneficial effects of the utility model are:

[0020] The advantages of the aluminum electrolytic capacitor with built-in fuse provided by the utility model are: batch production can be realized, no additional fuse circuit is needed, circuit occupation can be reduced and production efficiency can be improved, and the fuse occupies a very small volume and does not affect the product capacity; when the capacitor core is short-circuited or fails, the internal fuse will be blown, thereby changing it to an open-circuit mode with a lower degree of danger, thereby preventing the capacitor from burning the circuit board or other electronic components due to a short circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 A schematic diagram of the structure of an aluminum capacitor provided for the implementation of the utility model;

[0022] Figure 2 A schematic diagram of the structure of the lead frame provided for the implementation of the utility model;

[0023] Figure 3 A flowchart of a method for manufacturing an aluminum capacitor provided for the implementation of the utility model;

[0024] The numbers in the figure are: 1. Conductive silver glue; 2. Negative terminal; 3. Isolation glue wire; 4. Positive terminal; 5. Single-chip core; 6. Capacitor core; 7. Epoxy resin shell; 8. Negative lead terminal; 9. Positive lead terminal; 10. Fuse; 11. Core welding terminal; 12. Lead frame. DETAILED DESCRIPTION

[0025] The following description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

[0026] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0027] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0028] Unless expressly stated to the contrary, all ranges cited herein are inclusive.

[0029] The term "at least one" used in the present invention is used to describe the elements and components described in the present invention. This is done only for convenience and to provide a general meaning to the scope of the present invention. This description should be understood to include one or at least one, and the singular also includes the plural, unless it is obvious that it means otherwise.

[0030] Unless otherwise defined, the meaning of all scientific and technological terms used in the present invention is the same as that commonly understood by those of ordinary skill in the field to which the present invention belongs. Although methods and materials similar or equivalent to the methods and materials described in the present invention can also be used in the implementation or testing of the present invention, suitable methods and materials are described below. All publications, patent applications, patents and other references mentioned in the present invention are incorporated into the present invention by reference in their entirety, unless specific paragraphs are cited. If a conflict occurs, this specification and the definitions included therein shall prevail. In addition, materials, methods and embodiments are merely illustrative and are not intended to be limiting.

[0031] Example 1

[0032] like Figure 1 and Figure 2 As shown, the utility model provides an aluminum electrolytic capacitor with a built-in fuse, which is composed of a capacitor core 6, an epoxy resin shell 7, a fuse 10, a positive lead terminal 8, a negative lead terminal 9 and a core welding terminal 11. The capacitor core 6 is formed by overlapping 6 single-piece cores 5, and the single-piece core 5 includes a negative terminal 2, an isolation rubber wire 3 and a positive terminal 4, and the isolation rubber wire 3 is arranged between the negative terminal 2 and the positive terminal 4.

[0033] The utility model designs a lead frame 12 structure, such as Figure 2 As shown, the lead frame 12 becomes the negative lead terminal 8, the positive lead terminal 9, and the core welding terminal 11 after being cut and bent.

[0034] like Figure 1As shown, the negative terminals 2 of the six monolithic cores 5 are first bonded to the overlapping area of ​​the negative lead terminals 8 through the conductive silver glue 1, and then welded to the lead frame 12, and the positive terminals 4 of the monolithic cores 5 are overlapped and welded to the core welding terminal 11, and then a fusible fuse 10 is connected to the core welding terminal 11, and the other end is connected to the positive lead terminal 9, so as to form the capacitor body. Then the capacitor body is encapsulated with epoxy resin to form a sealed protective shell, and then the negative lead terminal 8, the positive lead terminal 9, and the core welding terminal 11 are punched out from the lead frame 12 by a cutting device, and then the negative lead terminal 8 and the positive lead terminal 9 are bent into a shape that is convenient for surface mounting by a bending foot forming device, and then the subsequent aging, reflow soldering detection, bending foot forming, test sorting, appearance inspection, packaging and inspection warehousing processes are carried out to obtain the built-in fuse aluminum electrolytic capacitor described in the utility model.

[0035] The aluminum electrolytic capacitor with built-in fuse provided by the utility model does not need to add an additional fuse circuit, which can reduce circuit occupancy and improve production efficiency. In addition, the fuse occupies a very small volume and does not affect the product capacity. When the capacitor core is short-circuited or fails, the internal fuse will be blown, thereby changing it to an open-circuit mode with a lower degree of danger, thereby preventing the capacitor from burning the circuit board or other electronic components due to a short circuit.

[0036] The manufacturing process of the utility model built-in fuse aluminum electrolytic capacitor is as follows Figure 3 As shown, the following steps are performed in sequence: cutting, arranging, gluing, chemical formation, coating, polymerization, cleaning, chemical formation, carbon coating, silver coating, assembly, plastic sealing, cutting, aging, reflow soldering detection, bending foot molding, testing and sorting, appearance inspection, packaging and inspection for warehousing, etc.

[0037] Example 2

[0038] The difference from the first embodiment is that the core welding terminal 11 is connected to the positive electrode lead terminal 9 through two fusible fuses 10 .

[0039] Comparative Example

[0040] An aluminum electrolytic capacitor, whose structure does not contain a fuse compared with Example 1. If a fuse is not provided outside the aluminum electrolytic capacitor, when an individual solid aluminum electrolytic capacitor in a module in a circuit fails due to a short circuit, it is easy to overheat or there is a danger of burning.

[0041] In order to ensure the safety of the circuit, a fuse is installed outside the aluminum electrolytic capacitor. When the capacitor core is short-circuited or fails during use, the fuse outside the capacitor will be blown, making the problematic aluminum electrolytic capacitor in an open circuit state in the circuit. However, the additional addition of a fuse circuit not only requires matching the fuse circuit components with the capacitor, but also increases the circuit space and reduces production efficiency.

[0042] In summary, the utility model provides an aluminum electrolytic capacitor with a built-in fuse, which places the fuse inside the aluminum electrolytic capacitor. When the capacitor core is short-circuited or fails, the internal fuse will be blown, thereby turning it into an open-circuit mode with a lower risk, thereby preventing the capacitor from burning the circuit board or other electronic components due to a short circuit. Batch production can be achieved without the need for additional fuse circuits, which can reduce circuit occupancy and improve production efficiency. In addition, the fuse occupies a very small volume and does not affect the product capacity.

[0043] The above is only a preferred specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the utility model should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. An aluminum electrolytic capacitor with a built-in fuse, characterized in that: The aluminum electrolytic capacitor comprises: a shell, a capacitor core, a fuse, a positive lead terminal, a negative lead terminal and a core welding terminal, wherein the capacitor core comprises a single-piece core, and the single-piece core comprises a negative terminal, an isolation rubber wire and a positive terminal; The negative terminal of the single-piece core is connected to the negative lead-out terminal, and the positive terminal is connected to the core welding terminal; One end of the fuse is connected to the core welding terminal, and the other end is connected to the positive lead terminal; After the components are connected, they are packaged by injection molding materials to form a shell, and the positive electrode lead-out terminal and the negative electrode lead-out terminal are led out from the shell; The positive end of the single-piece core is overlapped and welded on the core welding terminal; The negative terminal of the single-piece core is bonded to the overlapping area of ​​the negative electrode lead-out terminal by means of conductive adhesive; The conductive glue is conductive silver glue; The isolation rubber line is arranged between the negative terminal and the positive terminal.

2. The aluminum electrolytic capacitor with built-in fuse according to claim 1, characterized in that: The number of the capacitor core is at least one.

3. The aluminum electrolytic capacitor with built-in fuse according to claim 1, characterized in that: The number of the fuses is 1 to 4.

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