Winding type capacitor core body and capacitor

Abstract

The utility model discloses a winding type capacitor core body and a capacitor. The winding type capacitor core body comprises a first pole piece, a second pole piece, at least two first insulation sheets, a second insulation sheet, a first pole lead terminal and a second pole lead terminal. The second pole piece is stacked on the first pole piece; all the first insulating sheets are overlapped, and the first insulating sheets are positioned between the first pole piece and the second pole piece; the second insulating sheet is stacked on one side of the whole of the first pole piece and the second pole piece; the first pole lead terminal is connected to one side, close to the first insulating sheet, of the first pole piece; the second pole lead terminal is connected to one side, close to the first insulating sheet, of the second pole sheet; wherein the first pole piece, the first insulating piece, the second pole piece and the second insulating piece are coaxially wound.

Description

Technical Field

[0001] The utility model relates to the field of capacitors, and particularly to a wound capacitor core and a capacitor. Background Art

[0002] Existing capacitors usually have a wound capacitor core, which includes a positive electrode sheet, a first insulating sheet, a negative electrode sheet, and a second insulating sheet stacked in sequence. A positive electrode lead terminal is connected to one side of the positive electrode sheet close to the first insulating sheet, and a negative electrode lead terminal is connected to one side of the negative electrode sheet close to the second insulating sheet. However, with the improvement of the performance requirements of capacitors, the thicknesses of the first insulating sheet and the second insulating sheet are thinned, voltage and current concentrate at the positive electrode lead terminal and the negative electrode lead terminal, the voltage difference between the positive electrode lead terminal and the negative electrode sheet is relatively large, which easily breaks down the first insulating sheet, and the voltage difference between the negative electrode lead terminal and the positive electrode sheet of another turn is relatively large, which also easily breaks down the second insulating sheet, resulting in capacitor damage and abnormal operation. Summary of the Utility Model

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. For this purpose, the utility model provides a wound capacitor core, which can reduce the risk of insulation breakdown.

[0004] The utility model also provides a capacitor with the above-mentioned wound capacitor core.

[0005] The wound capacitor core according to the first aspect embodiment of the utility model includes a first electrode sheet, a second electrode sheet, at least two first insulating sheets, a second insulating sheet, a first electrode lead terminal, and a second electrode lead terminal. The second electrode sheet is stacked on the first electrode sheet; all the first insulating sheets are stacked, and the first insulating sheets are located between the first electrode sheet and the second electrode sheet; the second insulating sheet is stacked on one side of the whole of the first electrode sheet and the second electrode sheet; the first electrode lead terminal is connected to one side of the first electrode sheet close to the first insulating sheet; the second electrode lead terminal is connected to one side of the second electrode sheet close to the first insulating sheet; wherein the first electrode sheet, the first insulating sheet, the second electrode sheet, and the second insulating sheet are coaxially wound and arranged.

[0006] The wound capacitor core according to the first aspect embodiment of the present utility model has at least the following beneficial effects: The first pole lead terminal is made on one side of the first pole piece close to the first insulating sheet, and the second pole lead terminal is made on one side of the second pole piece close to the first insulating sheet. A plurality of first insulating sheets are stacked, so that there are a plurality of stacked first insulating sheets between the first pole lead terminal and the second pole piece and between the second pole lead terminal and the first pole piece. Therefore, it is difficult for breakdown insulation to occur between the first extreme terminal and the second pole piece and between the second pole lead terminal and the first pole piece, thus reducing the risk of breakdown insulation; and since it is not necessary to provide a plurality of second insulating sheets, the volume of the wound capacitor core is relatively small.

[0007] According to some embodiments of the present utility model, two first insulating sheets are provided. The lengths of the two first insulating sheets are different, and the two first insulating sheets form an insulating portion. The insulating portion has a single-layer section and a double-layer section. In the double-layer section, the two first insulating sheets overlap; in the single-layer section, there is only one first insulating sheet in the insulating portion; both the first pole lead terminal and the second pole lead terminal are opposite to the double-layer section.

[0008] According to some embodiments of the present utility model, along the length direction of the insulating portion, the double-layer section and the single-layer section are arranged in sequence, and the double-layer section is closer to the winding center of the insulating portion than the single-layer section.

[0009] According to some embodiments of the present utility model, the first pole lead terminal and the second pole lead terminal are arranged in a staggered manner.

[0010] According to some embodiments of the present utility model, the first pole lead terminal includes a first pole lead wire, a first pole intermediate block, and a first pole connecting plate. The first pole connecting plate is connected to the first pole piece. The first pole lead wire is connected to the first pole connecting plate through the first pole intermediate block. The central axis of the first pole lead wire is parallel and spaced from the central plane of the first pole connecting plate; the second pole lead terminal includes a second pole lead wire, a second pole intermediate block, and a second pole connecting plate. The second pole connecting plate is connected to the second pole piece. The second pole lead wire is connected to the second pole connecting plate through the second pole intermediate block. The central axis of the second pole lead wire is parallel and spaced from the central plane of the second pole connecting plate.

[0011] According to some embodiments of the present utility model, the first pole lead wire is radially outwardly offset relative to the first pole connecting plate along the winding axis of the wound capacitor core; the second pole lead wire is radially outwardly offset relative to the second pole connecting plate along the winding axis of the wound capacitor core.

[0012] According to some embodiments of the present utility model, all of the first insulating sheets are integrally formed structures.

[0013] According to some embodiments of the present utility model, all of the first insulating sheets are formed by folding the same sheet.

[0014] According to some embodiments of the present utility model, both the first insulating sheet and the second insulating sheet are insulating papers, and the first insulating sheet and the second insulating sheet have the same thickness.

[0015] A capacitor according to an embodiment of the second aspect of the present utility model includes the above-mentioned wound capacitor core.

[0016] The capacitor according to the embodiment of the second aspect of the present utility model has at least the following beneficial effects: due to the adoption of the above-mentioned wound capacitor core, the capacitor has a longer service life and a smaller volume.

[0017] The additional aspects and advantages of the present utility model will be partially given in the following description, partially become obvious from the following description, or be understood through the practice of the present utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and / or additional aspects and advantages of the present utility model will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, wherein:

[0019] Figure 1 is a three-dimensional schematic diagram of the wound capacitor core according to an embodiment of the present utility model;

[0020] Figure 2 is a top view schematic diagram of the wound capacitor core according to an embodiment of the present utility model;

[0021] Figure 3 is for the embodiment of the present utility model Figure 2 partial enlarged schematic diagram at A;

[0022] Figure 4 is a side view schematic diagram of the first pole lead terminal according to an embodiment of the present utility model.

[0023] Reference numerals:

[0024] First pole piece 100;

[0025] Second pole piece 200;

[0026] First insulating sheet 300;

[0027] Second insulating sheet 400;

[0028] First pole lead terminal 500, first pole lead-out wire 510, first pole intermediate block 520, first pole connecting plate 530;

[0029] The second pole lead terminal 600;

[0030] The insulating part 700, the single-layer section 710, the double-layer section 720;

[0031] The central axis B of the first pole lead wire, the central plane C of the first pole connecting plate. Specific embodiments

[0032] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present invention and should not be construed as a limitation to the present invention.

[0033] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by terms such as up and down, etc., is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0034] In the description of the present invention, "a plurality of" refers to more than two. If the first and second are described only for the purpose of distinguishing technical features, they should not be construed as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or the sequence of the indicated technical features.

[0035] In the description of the present invention, unless otherwise clearly defined, terms such as "set", "installed", "connected", etc. should be understood in a broad sense. Those skilled in the art can reasonably determine the specific meanings of the above terms in the present invention in combination with the specific content of the technical solution.

[0036] Existing capacitors usually have a wound capacitor core. The capacitor core includes a positive electrode plate, a first insulating sheet, a negative electrode plate, and a second insulating sheet stacked in sequence. A positive electrode lead terminal is connected to one side of the positive electrode plate close to the first insulating sheet, and a negative electrode lead terminal is connected to the negative electrode plate close to the second insulating sheet. However, with the improvement of the performance requirements of capacitors, the thicknesses of the first insulating sheet and the second insulating sheet are thinned, and the voltage and current are concentrated at the positive electrode lead terminal and the negative electrode lead terminal. The voltage difference between the positive electrode lead terminal and the negative electrode plate is relatively large, which easily breaks down the first insulating sheet. The voltage difference between the negative electrode lead terminal and another turn of the positive electrode plate is also relatively large, which also easily breaks down the second insulating sheet, resulting in damage to the capacitor and inability to work normally.

[0037] Refer to Figures 1 to 4, which is the wound capacitor core of the embodiment of the present utility model, includes a first pole piece 100, a second pole piece 200, two first insulating sheets 300, a second insulating sheet 400, a first pole lead terminal 500, and a second pole lead terminal 600. The second pole piece 200 is stacked on the first pole piece 100; all the first insulating sheets 300 are stacked, and the first insulating sheets 300 are located between the first pole piece 100 and the second pole piece 200; the second insulating sheet 400 is stacked on one side of the whole of the first pole piece 100 and the second pole piece 200; the first pole lead terminal 500 is connected to the side of the first pole piece 100 close to the first insulating sheet 300; the second pole lead terminal 600 is connected to the side of the second pole piece 200 close to the first insulating sheet 300; wherein the first pole piece 100, the first insulating sheet 300, the second pole piece 200, and the second insulating sheet 400 are coaxially wound and arranged.

[0038] The first pole lead terminal 500 is made on the side of the first pole piece 100 close to the first insulating sheet 300, and the second pole lead terminal 600 is made on the side of the second pole piece 200 close to the first insulating sheet 300. A plurality of first insulating sheets 300 are stacked, so that there are a plurality of stacked first insulating sheets 300 between the first pole lead terminal 500 and the second pole piece 200 and between the second pole lead terminal 600 and the first pole piece 100. Thus, it is difficult for the first extreme terminal and the second pole piece 200 and between the second pole lead terminal 600 and the first pole piece 100 to be broken down and insulated, thereby reducing the risk of breakdown insulation; and since there is no need to provide a plurality of second insulating sheets 400, the volume of the wound capacitor core is smaller.

[0039] Specifically, the first pole can be the positive pole, and at this time the second pole is the negative pole; it can be understood that the first pole can also be the negative pole, and correspondingly the second pole is the positive pole at this time.

[0040] Specifically, the second insulating sheet 400 can be located on the side of the first pole piece 100 away from the first insulating sheet 300, or can be located on the side of the second pole piece 200 away from the first insulating sheet 300.

[0041] In the embodiment, two first insulating sheets 300 are provided, and the lengths of the two first insulating sheets 300 are different. The two first insulating sheets 300 form an insulating portion 700, and the insulating portion 700 has a single-layer section 710 and a double-layer section 720. In the double-layer section 720, the two first insulating sheets 300 overlap; in the single-layer section 710, there is only one first insulating sheet 300 in the insulating portion 700; both the first pole lead terminal 500 and the second pole lead terminal 600 are opposite to the double-layer section 720.

[0042] The above structure enables the thickness of the insulating portion 700 in the single-layer section 710 to be relatively small, thereby reducing the volume of the wound capacitor core. When the volume of the capacitor core remains unchanged, the performance of the capacitor core can be improved.

[0043] In an embodiment, along the length direction of the insulating portion 700, the double-layer section 720 and the single-layer section 710 are arranged in sequence. The double-layer section 720 is closer to the winding center of the insulating portion 700 than the single-layer section 710, which facilitates the use of a capacitor winding device to automatically complete the winding of the double-layer section 720.

[0044] It can be imagined that the number of stacked first insulating sheets 300 can also be other numbers, such as three, four, or more. Those skilled in the art can configure it specifically according to actual needs.

[0045] In an embodiment, the first pole lead terminal 500 and the second pole lead terminal 600 are arranged in a staggered manner. Since the first pole lead terminal 500 is connected to the side of the first pole piece 100 close to the first insulating sheet 300, and the second pole lead terminal 600 is connected to the side of the second pole piece 200 close to the first insulating sheet 300, if the first pole lead terminal 500 and the second pole lead terminal 600 are opposite to each other, due to the voltage and current concentration effect of the lead terminals, it is easy to cause too large a voltage difference between the first pole lead terminal 500 and the second pole lead terminal 600, and breakdown the two layers of the first insulating sheet 300. Therefore, arranging them in a staggered manner can reduce the risk of breakdown of the double-layer first insulating sheet 300.

[0046] Optionally, the first pole lead terminal 500 and the second pole lead terminal 600 can be respectively arranged on opposite sides of the winding axis to further reduce the risk of insulation breakdown.

[0047] In an embodiment, the first pole lead terminal 500 includes a first pole lead 510, a first pole intermediate block 520, and a first pole connection plate 530. The first pole connection plate 530 is connected to the first pole piece 100. The first pole lead 510 is connected to the first pole connection plate 530 through the first pole intermediate block 520. The central axis of the first pole lead 510 is parallel and spaced from the central plane of the first pole connection plate 530. The second pole lead terminal 600 includes a second pole lead, a second pole intermediate block, and a second pole connection plate. The second pole connection plate is connected to the second pole piece 200. The second pole lead is connected to the second pole connection plate through the second pole intermediate block. The central axis of the second pole lead is parallel and spaced from the central plane of the second pole connection plate.

[0048] The above structure is beneficial to forming the first lead and the second lead with standard specifications in the capacitor core with reduced volume, and has better adaptability when the external circuit connects the first pole lead 510 and the second pole lead of the capacitor.

[0049] In an embodiment, the first pole lead 510 is radially outwardly offset relative to the first pole connecting plate 530 along the winding axis of the wound capacitor core; the second pole lead is radially outwardly offset relative to the second pole connecting plate along the winding axis of the wound capacitor core. The above structure is beneficial to reducing the length of the double-layer section 720, that is, reducing the number of turns of the double-layer section 720 wound, thereby further reducing the volume of the capacitor core.

[0050] Specifically, since the first pole lead 510 is outwardly offset relative to the first pole connecting plate 530, when maintaining the distance between the first pole lead 510 and the second pole lead of the standard specification, the first pole connecting plate 530 can be connected to the first pole piece 100 of the inner ring; similarly, the second pole connecting plate can also be connected to the second pole piece 200 of the inner ring. Since the double-layer section 720 of the insulating portion 700 extends along the length direction starting from the inner end, the necessary length of the double-layer section 720 can be reduced, the length of the single-layer section 710 can be increased, thereby reducing the volume of the capacitor core and improving the service performance of the capacitor core.

[0051] Specifically, the first pole lead terminal 500 is fixed to the first pole piece 100 by riveting, and the second pole lead terminal 600 is fixed to the second pole piece 200 by riveting. It can be understood that the first pole lead terminal 500 can also be connected to the first pole piece 100 by other means, such as welding, etc.; the second pole lead terminal 600 can also be connected to the second pole piece 200 by other means, such as welding, etc.

[0052] In an embodiment, all the first insulating sheets 300 are of an integrally formed structure, which is convenient for processing and winding the capacitor core. It can be imagined that all the first insulating sheets 300 can also be separate sheets stacked together.

[0053] In an embodiment, all the first insulating sheets 300 are formed by folding the same sheet, which is beneficial to simplifying the production process and facilitating the formation of the stacked structure of the plurality of first insulating sheets 300.

[0054] Specifically, in this embodiment, there are two first insulating sheets 300 between the first pole piece 100 and the second pole piece 200, that is, after folding the same insulating sheet once, a structure in which two first insulating sheets 300 are stacked can be formed.

[0055] In an embodiment, both the first insulating sheet 300 and the second insulating sheet 400 are insulating papers, and the first insulating sheet 300 and the second insulating sheet 400 have the same thickness, which is convenient for making with the same raw materials, and the preparation process of the raw materials is relatively simple, which is beneficial to simplifying the production process.

[0056] The present utility model also discloses a capacitor adopting the above-mentioned wound capacitor core. Due to the adoption of the above-mentioned wound capacitor core, the capacitor has a longer service life and a smaller volume.

[0057] Specifically, the capacitor further includes a housing and a sealing plug. The housing and the sealing plug enclose to form a containing cavity, the capacitor core is disposed in the containing cavity, and the first pole lead-out wire 510 and the second pole lead-out wire pass through the sealing plug and extend out.

[0058] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0059] Although the embodiments of the present utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present utility model. The scope of the present utility model is defined by the claims and their equivalents.

Claims

1. A wound capacitor core, characterized in that, Comprising: A first pole piece (100); A second pole piece (200), stacked on the first pole piece (100); At least two first insulating sheets (300), all the first insulating sheets (300) being stacked, and the first insulating sheets (300) being located between the first pole piece (100) and the second pole piece (200); A second insulating sheet (400), stacked on one side of the entirety of the first pole piece (100) and the second pole piece (200); A first pole lead terminal (500), connected to the side of the first pole piece (100) close to the first insulating sheet (300); A second pole lead terminal (600), connected to the side of the second pole piece (200) close to the first insulating sheet (300); Wherein, the first pole piece (100), the first insulating sheet (300), the second pole piece (200), and the second insulating sheet (400) are coaxially wound and arranged.

2. The wound capacitor core according to claim 1, wherein: There are two first insulating sheets (300) provided, the lengths of the two first insulating sheets (300) are different, the two first insulating sheets (300) form an insulating portion (700), the insulating portion (700) has a single-layer section (710) and a double-layer section (720), in the double-layer section (720), the two first insulating sheets (300) overlap; in the single-layer section (710), there is only one of the first insulating sheets (300) in the insulating portion (700); both the first pole lead terminal (500) and the second pole lead terminal (600) are opposite to the double-layer section (720).

3. The wound capacitor core according to claim 2, wherein: Along the length direction of the insulating portion (700), the double-layer section (720) and the single-layer section (710) are arranged in sequence, and the double-layer section (720) is closer to the winding center of the insulating portion (700) than the single-layer section (710).

4. The wound capacitor core according to claim 2, characterized in that: The first pole lead terminal (500) and the second pole lead terminal (600) are arranged in a staggered manner.

5. The wound capacitor core according to claim 3, wherein: The first pole lead terminal (500) includes a first pole lead wire (510), a first pole intermediate block (520), and a first pole connecting plate (530), the first pole connecting plate (530) is connected to the first pole piece (100), the first pole lead wire (510) is connected to the first pole connecting plate (530) through the first pole intermediate block (520), and the central axis of the first pole lead wire (510) is arranged in parallel and spaced from the central plane of the first pole connecting plate (530); the second pole lead terminal (600) includes a second pole lead wire, a second pole intermediate block, and a second pole connecting plate, the second pole connecting plate is connected to the second pole piece (200), the second pole lead wire is connected to the second pole connecting plate through the second pole intermediate block, and the central axis of the second pole lead wire is arranged in parallel and spaced from the central plane of the second pole connecting plate.

6. The wound capacitor core according to claim 5, wherein: The first pole lead-out wire (510) is radially outwardly offset relative to the first pole connection plate (530) along the winding axis of the wound capacitor core; the second pole lead-out wire is radially outwardly offset relative to the second pole connection plate along the winding axis of the wound capacitor core.

7. The wound capacitor core according to claim 1 or 2, characterized in that: All of the first insulating sheets (300) are integrally formed structures.

8. The wound capacitor core according to claim 7, wherein: All of the first insulating sheets (300) are formed by folding a same sheet.

9. The wound capacitor core according to claim 1, wherein: The first insulating sheet (300) and the second insulating sheet (400) are both insulating papers, and the first insulating sheet (300) and the second insulating sheet (400) have the same thickness.

10. A capacitor, characterized in that, Comprising the wound capacitor core according to any one of claims 1 to 9.

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