Capacitor packaging structure and thin film capacitor

Abstract

The utility model discloses a capacitor packaging structure and a film capacitor, and relates to the capacitor technology field, the capacitor packaging structure comprises a capacitor housing and a core, the core is arranged in a containing cavity of the capacitor housing, two sides of the core are provided with lead electrodes, each lead electrode comprises a connecting part, a positioning part and an extending part, the connecting part is connected with the core, and the positioning part is connected with the extending part. The positioning part abuts against the inner wall of the containing cavity of the capacitor shell, a first bend is arranged at the connecting position of the extending part and the positioning part, and the first bend is located in the containing cavity and located above the core. According to the capacitor packaging structure provided by the utility model, the first bend arranged on the lead electrode can be used as a reference point for judging the thickness of the potting material above the core, whether the pouring amount of the potting material is enough can be quickly judged in a visual manner, the steps are simple, the production efficiency is improved, and the production cost is reduced. And the core is fixed in the inner cavity of the capacitor shell through the positioning part, and the core does not float upwards, so that the use amount of unnecessary potting materials is reduced, and the production cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of capacitors, in particular to a capacitor packaging structure and a thin-film capacitor. Background Art

[0002] For precision capacitors, the thickness of the potting material on the core needs to be strictly controlled. The method is to measure the thickness of the potting material with a laser measuring instrument. Since the core may float when immersed in the potting material, it is necessary to perform a laser distance measurement on whether the core floats before potting, and then perform a laser distance measurement on the upper end surface of the potting material after potting, for a total of two measurements, to ensure that the thickness of the potting material on the core can meet the requirements.

[0003] The existing laser measurement method requires inspection outside the potting process. And to ensure that all products can meet the thickness requirements, the operation is carried out by pouring more potting material. However, using the laser measurement method will make the steps cumbersome, reduce the production efficiency, and also result in the use of unnecessary potting material, leading to high production costs. Summary of the Utility Model

[0004] 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 capacitor packaging structure, which can quickly judge whether the amount of potting material poured is sufficient, has simple steps, improves the production efficiency, reduces the use of unnecessary potting material, and reduces the production cost.

[0005] The utility model also provides a thin-film capacitor having the above capacitor packaging structure.

[0006] According to the capacitor packaging structure of the first aspect embodiment of the utility model, it includes:

[0007] A capacitor housing, provided with a cavity;

[0008] A core, located in the cavity. Lead electrodes are provided on both sides of the core. The lead electrodes include a connection part, a positioning part, and an extension part connected in sequence from bottom to top. The connection part is connected to the core, the positioning part abuts against the inner wall of the cavity of the capacitor housing to fix the core in the cavity, and a first bend is provided at the connection between the extension part and the positioning part. The first bend is located in the cavity and above the core.

[0009] The capacitor packaging structure according to the embodiments of the present utility model has at least the following beneficial effects: By arranging lead electrodes on both sides of the core in the cavity of the capacitor housing, the lead electrodes include a connecting portion, a positioning portion, and an extending portion. The lead electrodes are connected to the core through the connecting portion, and the positioning portion abuts against the inner wall of the cavity to fix the core in the cavity. A first bend is provided at the connection between the extending portion and the positioning portion. The first bend can be used as a reference point for judging the thickness of the potting material above the core. When the capacitor is potted, the potting material is poured into the cavity of the capacitor housing. When the potting material covers the first bend, the addition of the potting material is stopped. It is possible to quickly judge whether the amount of the potted material poured is sufficient by visual means. The steps are simple, the production efficiency is improved, and the core is fixed in the inner cavity of the capacitor housing through the positioning portion, so that the core will not float, reducing the amount of unnecessary potting material, thereby reducing the production cost.

[0010] According to some embodiments of the present utility model, the positioning portion includes a second arc segment, a straight segment, and a first arc segment connected in sequence from bottom to top. The first arc segment, the straight segment, and the second arc segment together form a protrusion extending in a direction away from the outer side of the core, and the straight segment abuts against the inner wall of the cavity.

[0011] According to some embodiments of the present utility model, the first bend is formed at the connection between the upper end of the first arc segment and the lower end of the extending portion, and the second bend is formed at the connection between the lower end of the second arc segment and the upper end of the connecting portion. The second bend is located below the upper end surface of the core.

[0012] According to some embodiments of the present utility model, the connecting portion is fixed to the side portion of the core and extends vertically downward, and the extending portion extends vertically upward and exceeds the capacitor housing.

[0013] According to some embodiments of the present utility model, in the vertical direction, the maximum distance between the first bend and the upper end surface of the core is H1, satisfying: 3 mm ≤ H1 ≤ 15 mm.

[0014] According to some embodiments of the present utility model, the cavity is filled with potting material, and the liquid surface of the potting material covers at least the first bend.

[0015] According to some embodiments of the present utility model, in the vertical direction, the minimum distance between the liquid surface of the potting material and the upper end surface of the core is H2, satisfying: 2 mm ≤ H2 ≤ 14 mm.

[0016] According to some embodiments of the present utility model, the lead electrodes are copper wires or iron wires, and the lead electrodes are fixed to both sides of the core by welding.

[0017] According to some embodiments of the present utility model, the capacitor housing is a resin plastic part.

[0018] A thin film capacitor according to an embodiment of the second aspect of the present utility model includes the capacitor packaging structure disclosed in the first aspect of the present utility model.

[0019] The thin film capacitor according to the embodiment of the second aspect of the present utility model has at least the following beneficial effects: Since the above capacitor packaging structure is adopted, by arranging lead electrodes on both sides of the core in the cavity of the capacitor housing, the lead electrodes include a connecting portion, a positioning portion and an extending portion. The lead electrode is connected to the core through the connecting portion, and the positioning portion abuts against the inner wall of the cavity to fix the core in the cavity. A first bend is provided at the connection between the extending portion and the positioning portion. The first bend can be used as a reference point for judging the thickness of the potting material above the core. When the capacitor is potted, the potting material is poured into the cavity of the capacitor housing. When the potting material covers the first bend, the addition of the potting material is stopped. It is possible to quickly judge whether the amount of the potted material poured in is sufficient by visual means. The steps are simple, the production efficiency is improved, and the core is fixed in the inner cavity of the capacitor housing through the positioning portion, so that the core will not float, reducing the amount of unnecessary potting material used, thereby reducing the production cost.

[0020] Additional aspects and advantages of the present utility model will be given in part in the following description, become apparent in part from the following description, or be learned through the practice of the present utility model. Description of the Drawings

[0021] The following further describes the present utility model in conjunction with the drawings and embodiments, where:

[0022] Figure 1 is a schematic structural diagram of the capacitor packaging structure according to an embodiment of the present utility model;

[0023] Figure 2 is an assembly schematic diagram of the lead electrode and the core.

[0024] Reference Signs:

[0025] Capacitor housing 100;

[0026] Core 200;

[0027] Lead electrode 300; Connecting portion 310; Positioning portion 320; First bend 321; First arc segment 322; Straight segment 323; Second arc segment 324; Second bend 325; Extending portion 330;

[0028] Potting material 400. Detailed Description of the Embodiments

[0029] Embodiments of the present utility model will be described in detail below. Examples of the embodiments are shown in the accompanying 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 by referring to the accompanying drawings are exemplary and are only used to explain the present utility model and should not be construed as a limitation to the present utility model.

[0030] In the description of the present utility model, it should be understood that with respect to the orientation description, such as the upper, lower, inner, outer, etc., the orientation or positional relationship indicated is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present utility model 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. Therefore, it should not be construed as a limitation to the present utility model.

[0031] In the description of the present utility model, if the first and second are described only for the purpose of distinguishing technical features, it should not be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features.

[0032] In the description of the present utility model, unless otherwise clearly defined, words such as setting, installation, connection, etc. should be understood in a broad sense. Those skilled in the art can reasonably determine the specific meanings of the above words in the present utility model in combination with the specific content of the technical solution.

[0033] An embodiment of the first aspect of the present utility model provides a capacitor packaging structure, specifically referring to the Figures 1 to 2 shown in the accompanying drawings of the specification.

[0034] Referring to Figure 1 and Figure 2As shown, in the embodiment of the present utility model, the capacitor housing 100 is provided with a cavity for accommodating the core 200. Lead electrodes 300 are provided on both sides of the core 200. The lead electrode 300 includes a connecting portion 310, a positioning portion 320, and an extending portion 330. The connecting portion 310, the positioning portion 320, and the extending portion 330 are connected in sequence from bottom to top. The connecting portion 310 located at the lower part of the lead electrode 300 is connected to the core 200. The positioning portion 320 can abut against the inner wall of the cavity of the capacitor housing 100 to fix the core 200 in the cavity, making the core 200 firmly fixed. A first bend 321 is provided at the connection between the extending portion 330 located at the upper part of the lead electrode 300 and the positioning portion 320. The first bend 321 is located in the cavity and above the core 200. The first bend 321 is directly formed by bending the lead electrode 300. The first bend 321 can be used as a reference point for the thickness of the potting material 400 above the core 200. When the potting material 400 is potted, the core 200 fixed in the cavity of the capacitor housing 100 is gradually covered by the potting material 400. As the potting material 400 is filled, the filling height of the potting material 400 in the cavity becomes higher and higher. When the potting material 400 covers the first bend 321 above the core 200, the potting is stopped, and the capacitor is encapsulated.

[0035] In the embodiment of the present utility model, lead electrodes 300 are provided on both sides of the core 200. The lead electrode 300 includes a connecting portion 310, a positioning portion 320, and an extending portion 330. The lead electrode 300 is connected to the core 200 through the connecting portion 310. The lead electrode 300 abuts against the inner wall of the cavity through the positioning portion 320 to firmly fix the core 200 in the cavity. A first bend 321 is provided at the connection between the extending portion 330 and the positioning portion 320. The first bend 321 serves as a reference point for judging the thickness of the potting material 400 above the core 200. When the capacitor is potted, the potting material 400 is poured into the capacitor housing 100 to fill the cavity. When the potting material 400 covers the first bend 321, the addition of the potting material 400 is stopped. By visually observing the first bend 321, it is possible to quickly judge whether the amount of the potted material 400 poured is sufficient. The whole process has simple steps, improves production efficiency, and the core 200 is fixed in the capacitor housing 100 through the positioning portion 320 of the lead electrode 300. The core 200 will not float during the potting process, reducing the amount of unnecessary potting material 400, thereby reducing production costs.

[0036] It can be understood that with reference to Figure 1 and Figure 2As shown, in the embodiment of the present utility model, the positioning portion 320 includes a second arc segment 324, a straight segment 323, and a first arc segment 322 that are connected in sequence from bottom to top. The first arc segment 322, the straight segment 323, and the second arc segment 324 together form a protrusion extending in a direction away from the outer side of the core 200. The straight segment 323 located in the middle of the positioning portion 320 abuts against the inner wall of the cavity, so that the protrusion abuts against the inner wall of the cavity. Since the lead electrodes 300 are provided on the left and right sides of the core 200, the positioning portions 320 of the lead electrodes 300 both abut against the inner wall of the cavity of the capacitor housing 100, and the lead electrodes 300 exert pressure on both sides of the core 200, thereby firmly fixing the core 200 in the cavity of the capacitor housing 100. The length of the straight segment 323 that abuts against the inner wall of the cavity can be extended or shortened according to actual needs to adjust the stability of the core 200 in the cavity of the capacitor housing 100.

[0037] It can be understood that, referring to Figure 2 As shown, in the embodiment of the present utility model, a first bend 321 is formed at the connection between the upper end of the first arc segment 322 and the lower end of the extension portion 330, and a second bend 325 is formed at the connection between the lower end of the second arc segment 324 and the upper end of the connection portion 310. The second bend 325 is located below the upper end surface of the core 200. The protrusion is located between the first bend 321 and the second bend 325, and the protrusion makes the lead electrode 300 abut against the capacitor housing 100 to fix the core 200 in the cavity.

[0038] It can be understood that, referring to Figure 1 and Figure 2 As shown, in the embodiment of the present utility model, the connection portion 310 of the lead electrode 300 is fixed to the side of the core 200 and extends vertically downward. The downwardly extending connection portion 310 can increase the contact area between the lead electrode 300 and the core 200, making the connection between the lead electrode 300 and the core 200 more stable. The extension portion 330 of the lead electrode 300 extends upward, and the height to which the lead electrode 300 extends exceeds the capacitor housing 100 and then connects to electrical components outside the capacitor housing 100.

[0039] It can be understood that, referring to Figure 1 and Figure 2 As shown, in the embodiment of the present utility model, the maximum distance between the first bend 321 and the upper end surface of the core 200 is H1, and H1 satisfies 3mm ≤ H1 ≤ 15mm. When the capacitor is tested, because capacitors have different models and performance specifications, the maximum distance between the first bend 321 and the upper end surface of the core 200 needs to be greater than or equal to 3mm, and the maximum distance also needs to be less than or equal to 15mm. Only within the range of the maximum distance from 3mm to 5mm can the test requirements of the capacitor be met and the product standards be achieved.

[0040] It can be understood that, referring toFigure 1 and Figure 2 As shown in Figure 2 , in the embodiment of the present utility model, the cavity is filled with potting material 400, and the liquid surface of the potting material 400 covers at least the first bend 321. The potting material 400 is used for potting and encapsulating the core 200. During the filling process of the potting material 400, the core 200 is covered. After the potting material 400 completely covers the core 200, it continues to be filled. The position of the first bend 321 is obtained through calculation and verification, and it is necessary to ensure that the position of the first bend 321 is within an appropriate range. Then, taking the first bend 321 as the reference point, the thickness of the potting material 400 filled above the core 200 is judged. The filling amount of the potting material 400 can be judged by visual means. When the potting material 400 covers the first bend 321, the filling can be stopped. That is to say, when the potting material 400 filled in the cavity covers at least the first bend 321, the filling thickness of the potting material 400 can meet the requirements of the product.

[0041] It can be understood that, referring to Figure 1 and Figure 2 As shown in Figure 2 , in the embodiment of the present utility model, the minimum distance between the liquid surface of the potting material 400 and the upper end of the core 200 is H2, and H2 satisfies 2mm ≤ H2 ≤ 14mm. When the potting material 400 contacts the inner wall of the inner cavity of the capacitor housing 100, the surface molecular force of the potting material 400 is a repulsive force, so that the liquid surface of the potting material 400 adheres to the inner wall, thus forming a concave liquid surface. The distance between the lowest point of the concave liquid surface and the upper end surface of the core 200 is H2, that is, at least ensuring that the thickness of the potting material 400 above the core 200 is at least greater than or equal to 2mm and less than or equal to 14mm. The minimum distance between the liquid surface of the potting material 400 and the upper end of the core 200 within the range of 2mm to 14mm can meet the test requirements of the capacitor and reach the product standard.

[0042] It can be understood that, referring to Figure 1 As shown in Figure 1 , in the embodiment of the present utility model, the lead electrode 300 is made of copper wire or iron wire. The lead electrode 300 is the part of the capacitor connecting to external electrical components, and its main function is to firmly connect the capacitor with the circuit to realize the normal operation of the circuit. The lead electrode 300 made of copper wire or iron wire has a hard texture, high strength, good electrical conductivity, and low cost, which can facilitate the processing and manufacturing of the capacitor. The lead electrode 300 is fused and fixed with the core 200 by means of current heating. Using the method of current heating does not require adding solder between the lead electrode 300 and the core 200, reducing the processing cost, and enabling the lead electrode 300 to be directly fixed on both sides of the core 200. The processing process is simple and fast.

[0043] It can be understood that, referring to Figure 1As shown, in the embodiment of the present utility model, the capacitor housing 100 is a resin plastic part. The housing of the resin plastic part can well protect the core 200 inside the capacitor, and improve the service life of the capacitor. The working conditions of the capacitor are usually affected by factors such as temperature, humidity, and pressure. At the same time, it may also suffer damages such as scratches and collisions during the working process. The resin plastic part can provide a housing for the capacitor, which can resist mechanical wear and errors, and improve the durability and reliability of the capacitor. Since the charge stored inside the capacitor has a high voltage, if the capacitor housing is not well protected, there may be a risk of electric shock. The resin plastic part can provide good insulation performance for the capacitor to ensure the safety and reliability of the capacitor.

[0044] An embodiment of the second aspect of the present utility model further provides a thin film capacitor, and the thin film capacitor includes the capacitor packaging structure of the above-mentioned first aspect embodiment.

[0045] Since the thin film capacitor adopts all the technical solutions of the capacitor packaging structure of the above-mentioned embodiment, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiment, which will not be elaborated here.

[0046] The above has described the embodiments of the present utility model in detail with reference to the drawings. Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present utility model, rather than to limit them; although the present utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present utility model.

Claims

1. A capacitor packaging structure, characterized in that: include: The capacitor housing is provided with a cavity; A core is located in the cavity, and lead electrodes are provided on both sides of the core. The lead electrodes include a connecting portion, a positioning portion and an extending portion which are connected in sequence from bottom to top. The connecting portion is connected to the core, and the positioning portion abuts against the inner wall of the cavity of the capacitor housing to fix the core in the cavity. A first bend is provided at the connection between the extension portion and the positioning portion, and the first bend is located in the cavity, and the first bend is located above the core.

2. The capacitor packaging structure according to claim 1, characterized in that: The positioning portion includes a second arc segment, a straight segment and a first arc segment connected in sequence from bottom to top, the first arc segment, the straight segment and the second arc segment together form a protrusion extending in a direction away from the outer side of the core, and the straight segment abuts against the inner wall of the cavity.

3. The capacitor packaging structure according to claim 2, characterized in that: The first bend is formed at the connection between the upper end of the first arc segment and the lower end of the extension portion, and the second bend is formed at the connection between the lower end of the second arc segment and the upper end of the connection portion. The second bend is located below the upper end surface of the core.

4. The capacitor packaging structure according to claim 1, characterized in that: The connecting portion is fixed to the side of the core and extends vertically downward, and the extending portion extends vertically upward and exceeds the capacitor housing.

5. The capacitor packaging structure according to claim 1, characterized in that: Along the up-down direction, the maximum distance between the first bend and the upper end surface of the core is H1, which satisfies: 3mm≤H1≤15mm.

6. The capacitor packaging structure according to claim 1, characterized in that: The cavity is filled with a potting material, and a liquid surface of the potting material at least covers the first bend.

7. The capacitor packaging structure according to claim 6, characterized in that: In the up-down direction, the minimum distance between the liquid surface of the potting material and the upper end surface of the core is H2, which satisfies: 2mm≤H2≤14mm.

8. The capacitor packaging structure according to claim 1, characterized in that: The lead electrodes are copper wires or iron wires, and are fixed to both sides of the core by welding.

9. The capacitor packaging structure according to claim 1, characterized in that: The capacitor housing is a resin plastic part.

10. A film capacitor, characterized in that The capacitor packaging structure comprises the capacitor packaging structure as claimed in any one of claims 1 to 9.

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