CN216562789U

CN216562789U - Low-impedance capacitor

Info

Publication number: CN216562789U
Application number: CN202123396536.4U
Authority: CN
Inventors: 林翠华; 余克壮; 吴文丽; 罗微微; 计友根
Original assignee: Huizhou Zeasset Electronic Technology Co ltd
Current assignee: Huizhou Zeasset Electronic Technology Co ltd
Priority date: 2021-12-31
Filing date: 2021-12-31
Publication date: 2022-05-17
Anticipated expiration: 2031-12-31

Abstract

The utility model discloses a low impedance capacitor, which belongs to the technical field of capacitors and comprises: the device comprises a shell, a sealing cover, a cathode guide pin, an anode guide pin and a capacitor core. The shell is connected with the sealing cover in a sealing way; the capacitor core is provided with at least two anode foil guide sheets, at least two anode foils, a cathode foil guide sheet, a cathode foil and a plurality of electrolytic papers. Each anode foil guide sheet is correspondingly connected with one anode foil; the anode foils are not connected to each other; the cathode foil guide sheet is connected with the cathode foil; the cathode foil and each anode foil are separated by the electrolytic paper. The anode foil, the cathode foil and the electrolytic paper are wound to overlap each other to form the capacitive body; the anode foil guide sheets are respectively connected with the anode guide pins; the cathode foil guide sheet is connected with the cathode guide pin. The utility model solves the technical problem of higher impedance of the electrolytic capacitor in the prior art.

Description

Low-impedance capacitor

Technical Field

The utility model relates to the technical field of capacitors, in particular to a low-impedance capacitor.

Background

At present, aluminum electrolytic capacitors are widely applied to industrial power supplies and consumer electronic products, and therefore, the performance of the aluminum electrolytic capacitors is required to have high ripple resistance, low impedance, ultrahigh voltage and other characteristics. The structure of the existing aluminum electrolytic capacitor generally comprises an aluminum shell and an electric core, wherein the electric core comprises a positive aluminum foil, a negative aluminum foil, a positive guide pin and a negative guide pin; the positive electrode guide pin is riveted with the positive electrode aluminum foil, the negative electrode guide pin is riveted with the negative electrode aluminum foil, or a guide foil strip is adopted to connect the terminal with the internal positive and negative electrode foils. Based on this, chinese patent CN1664968B discloses an aluminum electrolytic capacitor, which is obtained by forming an anode foil

And a cathode foil wound together with a separator containing a driving electrolyte and sandwiched therebetween.

However, there is a point where the impedance of the aluminum electrolytic capacitor described above can be improved. Specifically, in the aluminum electrolytic capacitor disclosed above, the anode foil and the cathode foil are wound by using a whole piece of intact foil paper; in actual use, the longer the winding length of a single piece of foil paper is, the larger the inductance value of the aluminum electrolytic capacitor finally wound by the foil paper is, and the higher the impedance of the aluminum electrolytic capacitor is; this phenomenon is more pronounced in rolled products of anode foil.

SUMMERY OF THE UTILITY MODEL

In view of the above, it is necessary to provide a low impedance capacitor to solve the technical problem of high impedance of the aluminum electrolytic capacitor in the prior art.

A low impedance capacitor, comprising: the device comprises a shell, a sealing cover, a cathode guide pin, an anode guide pin and a capacitor core. The shell is connected with the sealing cover in a sealing mode, and the sealing cover is arranged at the bottom of the shell. The cathode guide pin and the anode guide pin are respectively connected to the bottom of the capacitor core; the capacitor core is provided with at least two anode foil guide sheets, at least two anode foils, a cathode foil guide sheet, a cathode foil and a plurality of electrolytic papers. Each anode foil guide sheet is correspondingly connected with one anode foil; the anode foils are not connected to each other; the cathode foil guide sheet is connected with the cathode foil; the cathode foil and each anode foil are separated by the electrolytic paper. The anode foil, the cathode foil and the electrolytic paper are wound to overlap each other to form the capacitive body; the anode foil guide sheets are respectively connected with the anode guide pins; the cathode foil guide sheet is connected with the cathode guide pin.

Furthermore, the two anode foils are connected with one another through the electrolytic paper.

Furthermore, the two anode foils are connected to the same surface of the electrolytic paper, but the two anode foils are not abutted with each other.

Furthermore, the two anode foils are respectively connected to different surfaces of the electrolytic paper.

Furthermore, the anode foil guide sheet is provided with a plurality of welding holes.

Further, the anode foil lead is connected to the anode foil by a cold welding process.

Further, every two anode foils are arranged in an overlapping mode, and every two anode foils are separated through the electrolytic paper.

Further, the capacitor core is externally surrounded by an adhesive tape.

Further, a connecting ring is arranged between the anode guide pin and the anode foil guide sheet; the connecting ring is used for respectively connecting each anode foil guide sheet with the anode guide pin.

In summary, the low impedance capacitor of the present invention comprises a case, a sealing cap, a cathode guide pin, an anode guide pin and a capacitor core; the shell and the sealing cover are connected to form a relatively closed internal space, the capacitor core is arranged in the space, and the capacitor core is connected with the outside through the cathode guide pin and the anode guide pin. Furthermore, the capacitor core is provided with at least two anode foil guide sheets, at least two anode foils, a cathode foil guide sheet, a cathode foil and a plurality of electrolytic papers. Each anode foil guide sheet is correspondingly connected with one anode foil; the anode foils are not connected to each other; the cathode foil guide sheet is connected with the cathode foil; the cathode foil and each anode foil are separated by the electrolytic paper. The anode foil, the cathode foil, and the electrolytic paper are wound to overlap each other to form the capacitive body. Thus, a low impedance capacitor of the present invention is obtained by arranging said anode foil, which is longer in the prior art, as a number of said anode foils, which are shorter; and, make it not connect each other, thus, has shortened the arrangement length of the single stated positive pole foil; the longer the length of the anode foil is, the larger the inductance value is, and the higher the impedance is; in the technical scheme disclosed by the utility model, the plurality of short anode foils are arranged, so that the technical problem of high impedance of the aluminum electrolytic capacitor in the prior art is solved.

Drawings

FIG. 1 is a schematic diagram of a low impedance capacitor according to the present invention;

FIG. 2 is an expanded view of a portion of a low impedance capacitor according to the present invention;

FIG. 3 is an expanded view of a portion of a low impedance capacitor according to the present invention;

FIG. 4 is an expanded view of a portion of the structure of a low impedance capacitor according to an embodiment of the present invention;

FIG. 5 is an expanded view of a portion of another embodiment of a low impedance capacitor according to the present invention.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the utility model and to simplify the description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be considered limiting of the utility model.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

Referring to fig. 1 to 4, a low impedance capacitor of the present invention includes: the device comprises a shell 1, a sealing cover 2, a cathode guide pin 3, an anode guide pin 4 and a capacitor core 5. The housing 1 is hermetically connected to the sealing cap 2, and the sealing cap 2 is disposed at the bottom of the housing 1. The cathode guide pin 3 and the anode guide pin 4 are respectively connected to the bottom of the capacitor core 5; the capacitor core 5 has at least two anode foil leads 501, at least two anode foils 502, a cathode foil lead 503, a cathode foil 504, and a plurality of electrolytic papers 505. Each anode foil guide plate 501 is correspondingly connected with one anode foil 502; the anode foils 502 are not connected to each other; the cathode foil guide sheet 503 is connected to the cathode foil 504; the cathode foil 504 is separated from each of the anode foils 502 by the electrolytic paper 505. The anode foil 502, the cathode foil 504 and the electrolytic paper 505 are overlapped with each other and wound to form the main body of the capacitor 5; the anode foil guide tabs 501 are respectively connected to the anode guide pins 4; the cathode foil lead 503 is connected to the cathode lead 3.

Specifically, referring to fig. 4 again, fig. 4 is an expanded view of a partial structure of the capacitor core 5 in an embodiment of the low impedance capacitor of the present invention, which includes the anode foil guide 501, the anode foil 502 and the electrolytic paper 505. As shown in fig. 4, in this embodiment, two anode foil leads 501 and two anode foils 502 are respectively disposed in one capacitor core 5; each anode foil guide plate 501 is correspondingly connected with one anode foil 502; the two anode foils 502 are not connected to each other. Specifically, each of the anode foils 502 on both sides thereof may be connected by a shorter electrolytic paper 505. More specifically, the anode foils 502 may be connected to the same surface of the electrolytic paper 505, but the anode foils 502 do not abut against each other; in addition, the two anode foils 502 may be connected to two sides of the electrolytic paper 505, that is, one anode foil 502 is connected to the front side of the electrolytic paper 505, and the other anode foil 502 is connected to the back side of the electrolytic paper 505; the three parts are overlapped. Further, each anode foil guide plate 501 may be provided with a plurality of welding holes 501 a; thus, the anode foil leads 501 may be respectively attached to the anode foils 502 through a cold welding process. The cold welding process refers to a method of applying mechanical, molecular, or electrical force to diffuse the welding material to the surface of the appliance. More specifically, the cold welding process specifically comprises the following steps: the charging capacitor is used to discharge in an ultra-short time with a period of 10^ -3 to 10^ -1 seconds or with a period of 10^ -6 to 10^ -5 seconds. At the moment, the contact part of the electrode material and the die is heated to 8000-10000 ℃, and the molten metal in the plasma state is metallurgically transferred to the surface of the workpiece, so that the workpiece is bonded with high strength. The principle of cold welding is that the discharge time is very short compared with the next discharge interval time, so that the machine has enough relative stop time to diffuse heat to the outside through the basic body of the die, and therefore, the processed part of the die does not have heat accumulation. Although the temperature rise of the mold stays almost at room temperature, the temperature of the electrode tip may reach around 10000 ℃ due to instantaneous melting. Therefore, the welding rod instantly generates molten metal, the molten metal is transferred to the contact part of the base metal, and simultaneously, due to the high temperature action of the plasma arc, a strong diffusion layer like a root is formed in the deep part of the surface layer of the workpiece, so that the combined workpiece presents high bonding performance and cannot fall off.

Further, with continuing reference to fig. 5, fig. 5 is an expanded view of a partial structure of the capacitor core 5 in another embodiment of the low impedance capacitor of the present invention, which includes the anode foil lead 501, the anode foil 502 and the electrolytic paper 505. As shown in fig. 5, in this embodiment, two anode foils 502 are overlapped, and the two anode foils 502 are separated by the electrolytic paper 505; each anode foil 502 has one of the anode foil guides 501 attached thereto. Specifically, the two anode foils 502 are overlapped with each other, but the two anode foils 502 are separated from each other by the electrolytic paper 505, so that the two anode foils 502 are prevented from abutting against each other. Furthermore, a plurality of sets of anode foils 502 can be respectively disposed in the capacitor core 5, each anode foil 502 is correspondingly connected to one anode foil guide 501, each two anode foils 502 are isolated by the electrolytic paper 505, and then the plurality of sets of anode foils 502, cathode foils 504 and electrolytic paper 505 are wound to form the capacitor core 5, at this time, the plurality of anode foil guide 501 and cathode foil guide 503 are respectively arranged in groups so as to be respectively connected to the anode guide pins 4 and the cathode guide pins 3.

Further, the outside of the capacitor core 5 is also surrounded by an adhesive tape 6; the adhesive tape 6 can prevent the electrolytic paper 505, the cathode foil 504 and the anode foil 502 wound around the capacitor core 5 from being scattered. Further, a connection ring 7 is arranged between the anode guide pin 4 and the anode foil guide plate 501; the connection ring 7 connects each anode foil guide 501 with the anode guide pin 4. Specifically, if a plurality of sets of anode foil guide tabs 501 are disposed in the capacitor core 5, in order to facilitate guiding and using the anode foil guide tabs to an external circuit, a connection ring 7 may be disposed to connect the anode foil guide tabs with the anode guide pins 4 after being connected respectively. For example, the two may be joined by a riveting or welding process. Similarly, the connection ring may be disposed between the cathode lead 3 and the cathode foil lead 503.

In summary, the low impedance capacitor of the present invention comprises a case 1, a sealing cap 2, a cathode guide pin 3, an anode guide pin 4 and a capacitor core 5; the case 1 and the sealing cover 2 are connected to form a relatively closed internal space, the capacitor core 5 is disposed in the space, and the capacitor core 5 is connected to the outside through the cathode guide pin 3 and the anode guide pin 4. Further, the capacitor core 5 has at least two anode foil leads 501, at least two anode foils 502, a cathode foil lead 503, a cathode foil 504 and a plurality of electrolytic papers 505. Each anode foil guide plate 501 is correspondingly connected with one anode foil 502; the anode foils 502 are not connected to each other; the cathode foil guide sheet 503 is connected to the cathode foil 504; the cathode foil 504 is separated from each of the anode foils 502 by the electrolytic paper 505. The anode foil 502, the cathode foil 504, and the electrolytic paper 505 are wound to overlap each other to form the main body of the capacitor 5. Thus, a low impedance capacitor of the present invention is obtained by arranging said anode foil 502, which is longer in the prior art, as several shorter said anode foils 502; and, they are not connected to each other, thereby shortening the arrangement length of the single anode foil 502; the longer the length of the anode foil is, the larger the inductance value is, and the higher the impedance is; in the technical scheme disclosed by the utility model, the plurality of shorter anode foils 502 are arranged, so that the technical problem of higher impedance of the aluminum electrolytic capacitor in the prior art is solved.

All possible combinations of the technical features of the above embodiments may not be described for the sake of brevity, but should be considered as within the scope of the present disclosure as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the utility model. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. A low impedance capacitor, the low impedance capacitor comprising: the device comprises a shell (1), a sealing cover (2), a cathode guide pin (3), an anode guide pin (4) and a capacitor core (5); the shell (1) is connected with the sealing cover (2) in a sealing way, and the sealing cover (2) is arranged at the bottom of the shell (1); the cathode guide pin (3) and the anode guide pin (4) are respectively connected to the bottom of the capacitor core (5); the capacitor core (5) is provided with at least two anode foil guide sheets (501), at least two anode foils (502), a cathode foil guide sheet (503), a cathode foil (504) and a plurality of electrolytic papers (505); each anode foil guide sheet (501) is correspondingly connected with one anode foil (502); the anode foils (502) are not connected to each other; the cathode foil guide sheet (503) is connected with the cathode foil (504); the cathode foil (504) is separated from each anode foil (502) by the electrolytic paper (505); the anode foil (502), the cathode foil (504) and the electrolytic paper (505) are wound over each other to form a body of the capacitor core (5); the anode foil guide sheets (501) are respectively connected with the anode guide pins (4); the cathode foil guide sheet (503) is connected with the cathode guide pin (3).

2. A low impedance capacitor as claimed in claim 1, wherein: the two anode foils (502) are connected with one electrolytic paper (505).

3. A low impedance capacitor as claimed in claim 2, wherein: the two anode foils (502) are both connected to the same surface of the electrolytic paper (505), but the two anode foils (502) do not abut against each other.

4. A low impedance capacitor according to claim 2, wherein: the two anode foils (502) are respectively connected to different surfaces of the electrolytic paper (505).

5. A low impedance capacitor as claimed in claim 1, wherein: the anode foil guide sheet (501) is provided with a plurality of welding holes (501 a).

6. A low impedance capacitor as claimed in claim 5, wherein: the anode foil lead (501) is connected to the anode foil (502) by a cold welding process.

7. A low impedance capacitor as claimed in claim 1, wherein: every two anode foils (502) are arranged in an overlapping mode, and every two anode foils (502) are separated through the electrolytic paper (505).

8. A low impedance capacitor as claimed in claim 1, wherein: and an adhesive tape (6) is wound outside the capacitor core (5).

9. A low impedance capacitor according to claim 1, wherein: a connecting ring (7) is arranged between the anode guide pin (4) and the anode foil guide sheet (501); the connecting ring (7) is used for respectively connecting each anode foil guide sheet (501) with the anode guide pin (4).