Capacitors

Abstract

The present application provides a capacitor, the capacitor includes multiple capacitor layers; each capacitor layer includes: an insulating layer and multiple electrodes arranged on the insulating layer; the capacitor is made by stacking and winding multiple capacitor layers, and an insulator is arranged between two adjacent electrodes located on the same insulating layer in the capacitor, and the insulator is made of the same material as the insulating layer. The present application provides an insulator between two adjacent electrodes, which can improve the insulation performance of the capacitor, avoid the presence of air in the capacitor or reduce the amount of air in the capacitor, and thus avoid the electric field strength exceeding the insulation strength to cause breakdown. Therefore, the present application can improve the insulation performance of the capacitor and improve the performance and stability of the capacitor.

Description

Technical Field

[0001] The present application relates to the technical field of electrical equipment, and in particular to a capacitor. Background Art

[0002] Metal film capacitors are formed by placing metal electrodes on an insulating film and winding it into a cylindrical shape. The metal film capacitors in the related art have limitations in application, such as insufficient capacitance and poor voltage resistance. In addition, since there is air between the electrodes of the metal film capacitor, the local electric field inside the film capacitor is concentrated, the local electric field strength increases, and breakdown is prone to occur, thereby destroying the insulation performance of the capacitor. Summary of the invention

[0003] The embodiments of the present application provide a capacitor, which can improve the performance and stability of the capacitor.

[0004] The technical solution of the embodiment of the present application is implemented as follows:

[0005] An embodiment of the present application provides a capacitor, which includes multiple capacitor layers; each capacitor layer includes: an insulating layer and multiple electrodes arranged on the insulating layer; the capacitor is made by stacking and winding multiple capacitor layers, and an insulator is arranged between two adjacent electrodes located on the same insulating layer in the capacitor, and the insulator is made of the same material as the insulating layer.

[0006] In the above-mentioned capacitor, in each of the capacitance layers, a plurality of the electrodes are arranged on the first surface of the insulating layer, and a plurality of the insulators are arranged on the second surface of the insulating layer; in the capacitor, the two adjacent electrodes and the insulator arranged between the two adjacent electrodes are located in different capacitance layers.

[0007] In the above capacitor, the plurality of capacitance layers are stacked and wound in a direction with the second surface facing outward, and the surface of the capacitor has a plurality of the insulators.

[0008] In the above-mentioned capacitor, in each of the capacitance layers, a plurality of electrodes and a plurality of insulators are arranged on the first surface of the insulating layer, and the electrodes and the insulators are arranged at intervals; in the capacitor, the two adjacent electrodes and the insulator arranged between the two adjacent electrodes belong to the same capacitance layer.

[0009] In the above capacitor, the plurality of capacitance layers are stacked and wound in a direction with the first surface facing inward.

[0010] In the above capacitor, the width of each electrode in the capacitor is the same, and the first spacing between two adjacent electrodes is the same.

[0011] In the above capacitor, the second spacing between two adjacent insulators in the capacitor is the same, and the difference between the second spacing and the width of the electrode is smaller than a preset value.

[0012] In the above capacitor, the multiple capacitor layers include: a first capacitor layer, a second capacitor layer, a third capacitor layer, a fourth capacitor layer, a fifth capacitor layer and a sixth capacitor layer.

[0013] In the above-mentioned capacitor, the first electrode in the first capacitor layer that is closest to the first end of the capacitor has a first spacing with the first end; the second electrode in the second capacitor layer that is closest to the first end has a second spacing with the first end, and the second spacing is smaller than the first spacing; the third electrode in the third capacitor layer that is closest to the first end has a third spacing with the first end, and the third spacing is smaller than the first spacing and larger than the second spacing; the fourth electrode in the fourth capacitor layer that is closest to the first end has a fourth spacing with the first end, and the fourth spacing is smaller than the first spacing, the second spacing and the third spacing; the fifth electrode in the fifth capacitor layer that is closest to the first end has the first spacing with the first end; the sixth electrode in the sixth capacitor layer that is closest to the first end has the second spacing with the first end.

[0014] In the above capacitor, the insulating layer is made of polypropylene or polyester.

[0015] The embodiments of the present application have the following beneficial effects:

[0016] The capacitor of the embodiment of the present application includes multiple capacitor layers, each capacitor layer includes an insulating layer and multiple electrodes arranged on the insulating layer, and the capacitor is made by stacking and winding multiple capacitor layers. An insulator is arranged between two adjacent electrodes located in the same insulating layer in the capacitor, and the insulator is made of the same material as the insulating layer. In this way, in the embodiment of the present application, by arranging an insulator between the electrodes, the insulation performance of the capacitor can be improved, the presence of air in the capacitor can be avoided or the amount of air in the capacitor can be reduced, thereby avoiding the breakdown phenomenon caused by the electric field strength exceeding the insulation strength. The present application can improve the performance and stability of the capacitor. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the winding structure of a capacitor in the related art provided by an embodiment of the present application;

[0018] Figure 2 is a schematic diagram of a cross-sectional structure of a capacitor in the related art provided by an embodiment of the present application;

[0019] Figure 3is a schematic diagram of the cross-sectional structure of a capacitor provided in an embodiment of the present application;

[0020] Figure 4 is a schematic diagram of the cross-sectional structure of a capacitor layer provided in an embodiment of the present application;

[0021] Figure 5 is another schematic diagram of the cross-sectional structure of the capacitor provided in an embodiment of the present application;

[0022] Figure 6 is another schematic diagram of the cross-sectional structure of the capacitor layer provided in an embodiment of the present application;

[0023] Figure 7 is a schematic diagram of the circuit principle of the capacitor provided in the embodiment of the present application;

[0024] Fig. 8A It is a schematic diagram of the manufacturing process of thin film pressing provided in the embodiment of the present application;

[0025] Figure 8B It is a schematic diagram of the surface structure of the pressure roller provided in an embodiment of the present application. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solutions and advantages of the present application clearer, the present application will be further described in detail below in conjunction with the accompanying drawings. The described embodiments should not be regarded as limiting the present application. All other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of this application.

[0027] In the following description, reference is made to “some embodiments”, which describe a subset of all possible embodiments, but it can be understood that “some embodiments” may be the same subset or different subsets of all possible embodiments and may be combined with each other without conflict.

[0028] In the following description, the terms "first\second" involved are merely used to distinguish similar objects and do not represent a specific ordering of the objects. It can be understood that "first\second" can be interchanged with a specific order or sequence where permitted, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein.

[0029] Unless otherwise defined, all technical and scientific terms used in the embodiments of the present application have the same meanings as those commonly understood by those skilled in the art. The terms used in the embodiments of the present application are only for the purpose of describing the embodiments of the present application and are not intended to limit the present application.

[0030] Before further describing the embodiments of the present application in detail, the nouns and terms involved in the embodiments of the present application are explained. The nouns and terms involved in the embodiments of the present application are subject to the following interpretations.

[0031] 1) Metal film capacitor: A capacitor whose electrodes are made of metal film and the dielectric is usually made of plastic film (such as polypropylene, polyester, etc.). The metal film is deposited on the plastic film by physical or chemical methods to form a thin and uniform conductive layer.

[0032] 2) Electrode: A key component in a capacitor that transfers charge.

[0033] 3) Dielectric: It is an insulator that can be polarized. The charged particles of the dielectric are tightly bound by the internal forces of atoms and molecules or the forces between molecules, so the charge of these particles is bound charge. Under the action of an external electric field, these charges can only move within a microscopic range, resulting in polarization. Since the resistivity of dielectrics is generally very high, they are also called insulators or non-conductors. In a capacitor, the dielectric is a material placed between the two electrodes, which prevents the direct flow of charge but allows the electric field to pass, thereby allowing charge to accumulate on the electrodes.

[0034] 4) Capacitance: Also known as capacitance, it is a physical quantity that measures the ability of a capacitor to store charge. It indicates the amount of charge that a capacitor can store when a voltage is applied between its two plates.

[0035] 5) Loss tangent: A parameter that describes the energy loss characteristics of capacitors or other dielectric materials. It is a measure of dielectric loss and reflects the efficiency of converting internal energy of the dielectric into heat energy under the action of an electric field.

[0036] In the related technologies, metal film capacitors have limitations in application, such as volume, capacitance and performance that are difficult to meet the requirements. Figure 1 , Figure 1 It is a schematic diagram of the winding structure of the capacitor in the related technology provided in an embodiment of the present application. The capacitor includes four layers, namely a first layer 11, a second layer 12, a third layer 13 and a fourth layer 14, wherein each layer includes a plastic film 15 and a metal film 16.

[0037] See also Figure 2 , Figure 2 2 is a schematic diagram of a cross-sectional structure of a capacitor in the related art provided by an embodiment of the present application. When the multi-layer structure is stacked and wound, there will be a certain gap 21 between each layer of plastic film, and the air in the gap 21 will cause the capacitor to have the following problems:

[0038] 1. Capacitance value decreases: The effective electrode area of ​​the capacitor decreases, which reduces the capacitance value. This is because the dielectric constant of air (about 1) is much smaller than that of commonly used dielectrics (such as polyethylene or polypropylene, etc.). The area filled with air is equivalent to introducing a medium with a smaller dielectric constant between the capacitor electrodes, thereby reducing the total capacitance value of the capacitor.

[0039] 2. The loss tangent increases: The presence of air will cause local electric field concentration inside the capacitor, causing local discharge or electron flow, thereby increasing the loss tangent, affecting the normal operation of the capacitor and causing power loss.

[0040] 3. Reduced insulation strength: Air will cause local electric field concentration inside the capacitor, thereby increasing the local electric field strength. When the electric field strength exceeds the insulation strength, breakdown will occur, destroying the insulation performance of the capacitor.

[0041] Based on the above problems existing in the related art, the embodiments of the present application provide a capacitor, which can improve the performance and stability of the capacitor. Figure 3 , Figure 3 is a schematic diagram of the cross-sectional structure of the capacitor provided in the embodiment of the present application. Figure 3 Provide explanation.

[0042] like Figure 3 As shown, the capacitor includes a plurality of capacitor layers 31, each capacitor layer 31 includes an insulating layer 32 and a plurality of electrodes 33 disposed on the insulating layer 32. The capacitor is made by stacking and winding a plurality of capacitor layers 31, wherein an insulator 34 is disposed between two adjacent electrodes located on the same insulating layer in the capacitor.

[0043] Here, the insulator is made of the same material as the insulating layer, and is a flexible material with insulating properties, such as polypropylene or polyester. The electrode is made of metal and is obtained by spraying a 10-micron thick metal coating on the surface of the insulating layer. The insulator is the same height as the electrode, usually about 10 microns. The insulator can be connected to the insulating layer, for example, by connecting and fixing the insulator and the insulating layer with a viscous insulating material, or in the generation process, the insulator and the insulating layer are regarded as a whole and integrally formed. Multiple capacitor layers are stacked in sequence, and then wound in the direction in which the electrode faces the inside and extends along the length edge of the electrode to obtain a capacitor, and the electrodes of each layer in the capacitor are isolated from each other by the insulator provided.

[0044] In the embodiment of the present application, the capacitor includes multiple capacitor layers, each capacitor layer includes an insulating layer and multiple electrodes arranged on the insulating layer, and the capacitor is made by stacking and winding multiple capacitor layers. An insulator is arranged between two adjacent electrodes located on the same insulating layer in the capacitor, and the insulator is made of the same material as the insulating layer. In this way, by filling the insulator between the electrodes, there can be no air or very little air in each capacitor layer of the capacitor. Since the insulator is made of the same material as the insulating layer and has good insulation performance, it can improve the insulation strength of the capacitor, avoid breakdown, and enhance the insulation performance and safety of the capacitor.

[0045] In some embodiments, see Figure 4 In each capacitor layer, a plurality of electrodes are disposed on the first surface 411 of the insulating layer 32, and a plurality of insulators are disposed on the second surface 412 of the insulating layer 321. Here, in each capacitor layer, electrodes and insulators are disposed on both sides of the insulating layer, respectively, and the heights of the electrodes and insulators are the same. That is, in a single capacitor layer, the electrodes and insulators are disposed on two different sides of the capacitor layer.

[0046] in, Figure 4 When the capacitor layers shown in FIG. 1 are stacked and wound, the multiple capacitor layers are stacked and wound in a direction in which the second surface faces outward, and the surface of the capacitor has multiple insulators. Therefore, the cross section of the capacitor finally obtained is as follows: Figure 3 As shown, two adjacent electrodes and an insulator disposed between the two adjacent electrodes are located in different capacitor layers.

[0047] Correspondingly, Figure 4 The capacitor finally formed by the capacitance layer shown in the figure has the second side of the outermost capacitor (corresponding to Figure 3 The sixth capacitor layer 316 in the capacitor is formed by a plurality of insulators on the outermost capacitor layer. The inner surface of the capacitor is the first surface of the innermost capacitor layer (corresponding to Figure 3 The first capacitor layer 311 in the capacitor is formed by a plurality of electrodes on the innermost capacitor layer. In the process of stacking multiple capacitor layers, the electrode on the first side of capacitor layer A will be embedded by the insulator of another capacitor layer B, and the insulator on the second side of capacitor layer A will be embedded in the electrode of another capacitor layer C. Therefore, in the rolled capacitor, two adjacent electrodes and the insulator disposed between the two adjacent electrodes belong to different capacitor layers. In addition, there is no insulator embedded between the electrodes of the innermost capacitor layer.

[0048] In an embodiment of the present application, in each capacitor layer, a plurality of electrodes are provided on the first side of the insulating layer, a plurality of insulators are provided on the second side of the insulating layer, and a plurality of capacitor layers are superimposed and wound in a direction in which the second side faces outward to obtain a capacitor, so the surface of the capacitor has a plurality of insulators. In this way, the insulators scattered on the surface of the capacitor can increase the insulation thickness on the surface of the capacitor, ensure the insulation strength between the outermost electrode in the capacitor and the external environment, thereby improving the performance and safety of the overall capacitor. In addition, since the electrodes and insulators in the capacitor are different capacitor layers embedded in each other, the thickness of the multiple capacitor layers after superposition will be reduced and the connection will be more secure, thereby reducing the volume of the capacitor and improving the stability of the capacitor.

[0049] In some embodiments, see Figure 5 In each capacitor layer, a plurality of electrodes and a plurality of insulators are disposed on the first surface 411 of the insulating layer 32. Here, the electrodes and the insulators are disposed on the same surface of the insulator, and the electrodes and the insulators are spaced apart from each other, and the electrodes and the insulators have the same height.

[0050] Among them, according to Figure 5 When the capacitor layers shown in FIG. 1 are wound in a stacked manner, the multiple capacitor layers are wound in a stacked manner with the first surface facing inward, so the surface of the capacitor obtained is a smooth insulating layer. The cross section of the capacitor obtained is as follows: Figure 6 As shown, two adjacent electrodes and an insulator arranged between the two adjacent electrodes belong to the same capacitor layer.

[0051] Correspondingly, Figure 5 The capacitor finally formed by the capacitance layer shown in the figure has an outer surface which is the second side of the outermost capacitance layer, so the surface is the side of the outermost capacitance layer without electrodes and insulators. The inner surface of the capacitor is the first side of the innermost capacitance layer, so the inner surface of the capacitor has multiple electrodes and insulators on the innermost capacitance layer. Figure 5 In the capacitor obtained by rolling up the capacitance layer shown, two adjacent electrodes and the insulator arranged between the two adjacent electrodes belong to the same capacitance layer.

[0052] In the embodiment of the present application, in each capacitor layer, the first surface of the insulating layer is provided with a plurality of electrodes and a plurality of insulators, so the positional relationship between the electrodes and the insulators in each capacitor layer is not easy to change, and the embedding of the insulators is more stable. In addition, the plurality of capacitor layers are stacked and wound in a direction with the first surface facing inward, and the surface of the formed capacitor is a smooth insulating layer, so the appearance of the finally formed capacitor is more concise.

[0053] In some embodiments, see Figure 3, the width W of each electrode in the capacitor is the same, and the distance D1 between two adjacent electrodes is the same; the distance D2 between two adjacent insulators in the capacitor is the same, and the difference between D2 and the width W of the electrode is less than a preset value.

[0054] Here, the widths of all electrodes in the capacitor are the same, the widths of all insulators are the same, and the spacing between two adjacent electrodes is the same, and the spacing between two adjacent insulators is also the same. Among them, the difference between the spacing between two adjacent insulators and the width of the electrode can be 0, because the insulator is a flexible material, so the electrodes and insulators can be embedded in each other through deformation. Alternatively, the difference between the spacing between two adjacent insulators and the width of the electrode is greater than 0 but less than a preset value, such as between 0 and 200 microns. In this way, while facilitating smoother embedding of the electrodes and insulators, it is also possible to ensure that the electrodes and insulators are closely connected to avoid gaps as much as possible.

[0055] In this way, since the width and spacing of the electrodes and the insulator are uniform, when the insulating layer and the insulator are produced as a whole, they can be made by film pressing. First, a groove is pressed on the film according to the electrode width and the spacing between the two electrodes to obtain the initial film after pressing. The raised part of the initial film is used as an insulator, and the flat part outside the insulator is used as an insulating layer. Then, the original film is cut to cut out the insulating layer required for each capacitor layer, and an insulator is provided on the insulating layer. In this way, the insulator and insulating layer of each capacitor layer can be produced uniformly, and there is no need to customize the production of the corresponding insulating layer and insulator for each capacitor layer, thereby improving the production efficiency of the capacitor.

[0056] In some embodiments, the plurality of capacitor layers include: a first capacitor layer, a second capacitor layer, a third capacitor layer, a fourth capacitor layer, a fifth capacitor layer, and a sixth capacitor layer. In other words, the capacitor includes six layers of capacitor layers. In this way, since there are more capacitor layers in the capacitor, there are more electrodes in the capacitor, so the capacitance of the capacitor will increase. And the reactance of the capacitor is inversely proportional to the capacitance, so the reactance of the capacitor will decrease, so the smaller the obstacle encountered when the high-frequency signal passes through the capacitor, the capacitor will have a better high-frequency response and can be applied to a wider frequency range. In addition, the increase in the number of layers of the capacitor helps to disperse the heat more evenly, so the heat dissipation performance of the capacitor is improved, and the increase in the number of layers of the capacitor increases the possibility of the capacitor self-healing and improves the durability of the capacitor.

[0057] In some embodiments, see Figure 3, the first electrode 301 in the first capacitor layer 311, which is closest to the first end 35 of the capacitor, has a first spacing L1 with the first end 35; the second electrode 302 in the second capacitor layer 312, which is closest to the first end 35, has a second spacing L2 with the first end 35, and the second spacing L2 is smaller than the first spacing L1; the third electrode 303 in the third capacitor layer 313, which is closest to the first end 35, has a third spacing L3 with the first end 35, and the third spacing L3 is smaller than the first spacing L1 and larger than the second spacing L2; the fourth electrode 304 in the fourth capacitor layer 314, which is closest to the first end 35, has a fourth spacing (in Figure 3 The fourth spacing is 0 and is not shown), and the fourth spacing is smaller than the first spacing L1, the second spacing L2 and the third spacing L3; the fifth electrode 305 in the fifth capacitor layer 315, which is closest to the first end 35, has a first spacing L1 with the first end 35; the sixth electrode 306 in the sixth capacitor layer 316, which is closest to the first end 35, has a second spacing L2 with the first end 35.

[0058] It should be noted that in Figure 3 In the description, the left end of the multilayer capacitor layer is used as the first end. The first end does not really exist, but is a reference line defined in the capacitor for the convenience of describing the position of the electrode. Therefore, the first end can be customized, and the specific sizes of the first spacing, the second spacing, the third spacing, and the fourth spacing will also change according to the position of the first end.

[0059] In addition, in the embodiment of the present application, the distance between the two electrodes of the upper and lower capacitor layers in different positions may be the same or different, but it can be proved by the following formula that the capacitance value of the capacitor has nothing to do with the distance between the two electrodes of the upper and lower capacitor layers:

[0060] The capacitance calculation formula is:

[0061]

[0062] Where C represents capacitance, ε represents dielectric constant, also known as permittivity, S is the effective area between the two electrodes, π is a constant representing the ratio of the circumference of a circle to its diameter, k represents the electrostatic force constant, also known as Coulomb constant, and d is the distance between the two electrodes;

[0063] The formula for calculating the field strength is:

[0064]

[0065] Where E is the electric field strength, U is the potential difference between two points in the electric field, and d is the distance between the two points. Assuming there are n layers of capacitance, there are 2n-1 sub-capacitors connected in parallel and then in series 21 times; assuming the sub-capacitor value is C, the capacitance value of the capacitor can be expressed as

[0066] Substituting formula (2) into formula (1), we can get the capacitance value C of the capacitor as:

[0067]

[0068] It can be seen from formula (3) that the capacitance of the capacitor is independent of the distance between the electrodes of the upper and lower capacitor layers, so the distribution of the electrodes in this application will not affect the overall capacitance of the capacitor.

[0069] In the embodiment of the present application, the first electrode closest to the first end of the capacitor in the first capacitor layer has a first spacing with the first end; the second electrode closest to the first end in the second capacitor layer has a second spacing with the first end, and the second spacing is smaller than the first spacing; the third electrode closest to the first end in the third capacitor layer has a third spacing with the first end, and the third spacing is smaller than the first spacing and larger than the second spacing; the fourth electrode closest to the first end in the fourth capacitor layer has a fourth spacing with the first end, and the fourth spacing is smaller than the first spacing, the second spacing, and the third spacing; the fifth electrode closest to the first end in the fifth capacitor layer has a first spacing with the first end; the sixth electrode closest to the first end in the sixth capacitor layer has a second spacing with the first end. In this way, it can be ensured that the electrodes of different capacitor layers are misplaced, so that overlapping areas are formed in the electrodes in the upper and lower capacitor layers, thereby forming multiple capacitors in the capacitor.

[0070] In some embodiments, multiple electrodes on any two capacitor layers in the first capacitor layer, the second capacitor layer, the third capacitor layer, and the fourth capacitor layer form a total of 21 capacitors by overlapping each other through staggered positions, see Figure 7 , that is, capacitor A, capacitor B, capacitor C, and capacitor U, a total of 21 capacitors, these 21 capacitors are connected in series. In the third capacitor layer, the fourth capacitor layer, the fifth capacitor layer, and the sixth capacitor layer, multiple electrodes on any two capacitors also overlap each other by staggering to form a total of 21 capacitors, see Figure 7 , namely, capacitor a, capacitor b, capacitor c, and capacitor u, a total of 21 capacitors, these 21 capacitors are also connected in series. Moreover, the first group of capacitors (i.e., capacitor A to capacitor U) and the second group of capacitors (i.e., capacitor a to capacitor u) are connected in parallel with each other.

[0071] Here, Figure 7Taking the capacitor A in FIG. 1 as an example, the capacitor A is composed of the first electrode on the left side of the fourth capacitor layer and the first electrode on the left side of the second capacitor layer; Figure 7 Taking capacitor B in the example, capacitor B is composed of the first electrode on the left side of the second capacitor layer and the first electrode on the left side of the third capacitor layer; Figure 7 Take the capacitor C in the figure as an example. The capacitor C is composed of the first electrode on the left in the third capacitor layer and the first electrode on the left in the first capacitor layer. Take the next capacitor D of the capacitor C as an example ( Figure 7 (not shown in the figure), the capacitor D is formed by the first electrode on the left side of the first capacitor layer and the first electrode on the left side of the second capacitor layer, and the other capacitors are similarly formed until the capacitor U. Figure 7 Taking the capacitor a in FIG. 1 as an example, the capacitor a is composed of the first electrode on the left side of the fourth capacitor layer and the first electrode on the left side of the sixth capacitor layer; Figure 7 Taking the capacitor b in FIG. 1 as an example, the capacitor b is composed of the first electrode on the left side of the sixth capacitor layer and the first electrode on the left side of the third capacitor layer; Figure 7 Take the capacitor c in the figure as an example. The capacitor c is composed of the first electrode on the left in the third capacitor layer and the first electrode on the left in the fifth capacitor layer. Take the next capacitor d of the capacitor c as an example ( Figure 7 (not shown in the figure), capacitor d is formed by the first electrode on the left in the fifth capacitor layer and the first electrode on the left in the fourth capacitor layer, and the same is true for other capacitors until capacitor u.

[0072] In some embodiments, when the insulator and the insulating layer are formed as a whole, it can be achieved by a thin film pressing method. Fig. 8A , Fig. 8A is a schematic diagram of the manufacturing process of film pressing provided in the embodiment of the present application, combined with Fig. 8A To explain:

[0073] Fig. 8AThe figure shows: a first reel 71, a second reel 72 and a pressure roller 73, which rotate counterclockwise. The first reel 71 is wound with a first polypropylene film 74 that has not been pressed yet; the second reel 72 is wound with a second polypropylene film 75 that has been pressed. The pressure roller 73 applies an upward pressure F during rolling, so that the pressure of the first polypropylene film 74 is between 2 and 5 mega Pascals (Pa). In addition, the pressure roller 73 needs to be heated to between 120 and 150 degrees Celsius. During the rotation of the pressure roller 73, the first polypropylene film 74 can be heated to about 100-120 degrees Celsius by heat conduction, and the pressure roller 73 applies a pressure of about 2-5MPa upward to the first polypropylene film 74, so that a groove is pressed on the first polypropylene film 74 by the pressure roller 73 to obtain the pressed second polypropylene film 75. In the second polypropylene film 75, compared with the groove, the raised part is regarded as an insulator, and the other part is regarded as an insulating layer as a plane. After the pressed second polypropylene film 75 is obtained, the second polypropylene film 75 can be cut according to the first spacing, the second spacing, the third spacing and the fourth spacing to obtain the insulating layer with an insulator required for each capacitor layer.

[0074] Among them, see Figure 8B , Figure 8B Schematic diagram of the surface structure of the pressure roller provided in the embodiment of the present application. The raised portion 731 on the surface of the pressure roller is a friction surface with a certain friction coefficient, so that while pressing the grooves, the polypropylene film can be transported forward under the action of friction, and finally multiple grooves are pressed on the entire roll of polypropylene film.

[0075] In the embodiment of the present application, the insulating layer with the insulator is produced by pressing a groove on the polypropylene film, so that the insulator and the insulating layer are produced as a whole. Since this film pressing method is simple, fast and low in cost, it can improve the production efficiency of the capacitor and reduce the production cost of the capacitor.

[0076] In summary, in the embodiment of the present application, firstly, by filling an insulator between the electrodes, air can be absent in each capacitance layer of the capacitor, so that the insulation strength of the capacitor can be improved, and the scattered raised insulators on the surface of the capacitor can further increase the insulation thickness on the surface of the capacitor, thereby avoiding breakdown and enhancing the insulation performance and safety of the capacitor. Secondly, since there are more electrodes of the capacitor, the capacitance of the capacitor will increase, and the reactance of the capacitor will decrease, and the capacitor will have a better high-frequency response and can be applied to a wider frequency range. In addition, the increase in the number of layers of the capacitor helps to disperse the heat more evenly, improves the heat dissipation performance of the capacitor, and increases the possibility of capacitor self-healing, and improves the durability of the capacitor. Finally, in the production process, it is not necessary to customize the production of corresponding insulating layers and insulators for each layer of capacitance, and the production efficiency of the capacitor can be improved by the film pressing method.

[0077] The above are only embodiments of the present application and are not intended to limit the protection scope of the present application. Any modifications, equivalent substitutions and improvements made within the spirit and scope of the present application are included in the protection scope of the present application.

Claims

1. A capacitor, characterized in that: The capacitor comprises a plurality of capacitance layers; Each capacitor layer includes: an insulating layer and a plurality of electrodes disposed on the insulating layer; The capacitor is made by stacking and winding a plurality of the capacitance layers. An insulator is arranged between two adjacent electrodes located on the same insulating layer in the capacitor. The insulator is made of the same material as the insulating layer.

2. The capacitor according to claim 1, characterized in that In each of the capacitor layers, a first surface of the insulating layer is provided with a plurality of the electrodes, and a second surface of the insulating layer is provided with a plurality of the insulators; In the capacitor, the two adjacent electrodes and the insulator disposed between the two adjacent electrodes are located in different capacitance layers.

3. The capacitor according to claim 2, characterized in that In the capacitor, the plurality of capacitance layers are stacked and wound in a direction with the second surface facing outward, and a plurality of the insulators are provided on the surface of the capacitor.

4. The capacitor according to claim 1, characterized in that In each of the capacitor layers, a plurality of electrodes and a plurality of insulators are arranged on the first surface of the insulating layer, and the electrodes and the insulators are arranged at intervals; In the capacitor, the two adjacent electrodes and the insulator disposed between the two adjacent electrodes belong to the same capacitance layer.

5. The capacitor according to claim 4, characterized in that In the capacitor, the plurality of capacitance layers are stacked and wound in a direction with the first surface facing inward.

6. The capacitor according to any one of claims 1 to 3, characterized in that: The width of each electrode in the capacitor is the same, and the first intervals between two adjacent electrodes are the same.

7. The capacitor according to claim 6, characterized in that The second spacings between two adjacent insulators in the capacitor are the same, and the difference between the second spacing and the width of the electrode is smaller than a preset value.

8. The capacitor according to any one of claims 1 to 3, characterized in that: The multiple capacitor layers include: a first capacitor layer, a second capacitor layer, a third capacitor layer, a fourth capacitor layer, a fifth capacitor layer and a sixth capacitor layer.

9. The capacitor according to claim 8, characterized in that A first electrode in the first capacitance layer that is closest to the first end of the capacitor has a first distance from the first end; A second electrode in the second capacitor layer that is closest to the first end has a second distance from the first end, and the second distance is smaller than the first distance; A third electrode in the third capacitor layer that is closest to the first end has a third distance from the first end, and the third distance is smaller than the first distance and larger than the second distance; A fourth electrode in the fourth capacitor layer that is closest to the first end has a fourth distance from the first end, and the fourth distance is smaller than the first distance, the second distance, and the third distance; A fifth electrode in the fifth capacitor layer that is closest to the first end has the first distance from the first end; The sixth electrode in the sixth capacitor layer, which is closest to the first end, has the second distance from the first end.

10. The capacitor according to any one of claims 1 to 3, characterized in that: The insulating layer is made of polypropylene or polyester.

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