Film capacitor manufacturing method and film capacitor

Abstract

The invention belongs to the technical field of capacitors and discloses a method for manufacturing a film capacitor. The method comprises the following steps: placing a capacitor core package to be impregnated into an impregnation device, then evacuating the impregnation device, and controlling the vacuum degree in the impregnation device to be within a gas partial pressure of 0.2 to 0.5 Pa; heating an impregnation liquid in the impregnation device to 65 to 70° C. and maintaining the vacuum state for 30 minutes; performing annular extrusion on the impregnated capacitor core package to squeeze as much gas dispersed in the capacitor core package as possible into one place to form an exhaust channel; the impregnation liquid can enter the capacitor core package through the exhaust channel, and then the impregnation liquid is evenly distributed between metallized films under the scraping of a scraper; when the impregnation liquid is squeezed, the bubbles are squeezed again by the impregnation liquid to further discharge the air between the metallized films. Using this method, the capacitor core package has a better impregnation effect, and the quality and service life of the film container are effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of capacitors, and in particular to a method for manufacturing a thin film capacitor and a thin film capacitor. Background Art

[0002] The core component of film capacitors is the capacitor core package. When the capacitor core package is made and the metallized film is wound on a high-speed winding machine, some air will be trapped between the metallized film layers, forming scattered bubbles, which will lead to uneven electric field distribution in the capacitor core package. When the field strength of these air gap bubbles (i.e. gas) or local solid insulation along the surface reaches a certain value or above, local discharge will occur. This discharge gradually expands the deterioration and damage of the insulation, and eventually the entire insulation will be broken down and flashed along the surface, which will reduce the quality and service life of the capacitor.

[0003] Therefore, after the metallized film is wound, the preliminary capacitor core package is made, and the capacitor core package needs to be impregnated so that the impregnation liquid enters the capacitor core package, replaces the air trapped in the capacitor core package, and removes the bubbles.

[0004] The existing impregnation method directly places the capacitor core package in a vacuum environment for impregnation. Since an extremely high compression coefficient is used during the winding process of the metallized film, the pressure between the metallized film layers is relatively high and the gaps are relatively small, so the amount of impregnation liquid entering the capacitor core package is limited, making it difficult to achieve good impregnation. As a result, the metallized film is easily broken down under high field strength, reducing the quality and service life of the film capacitor.

[0005] In view of this, the inventors of the present application invented a method for manufacturing a thin film capacitor and a thin film capacitor. Summary of the Invention

[0006] The present invention addresses the deficiencies of the prior art and provides a method for manufacturing a thin film capacitor and a thin film capacitor.

[0007] The present invention solves the above technical problems by the following technical means: a method for manufacturing a thin film capacitor, comprising the following steps:

[0008] S1, metallization, using evaporation equipment to evaporate a layer of metal on the surface of the film;

[0009] S2, film slitting, using a slitting device to slit the metallized film obtained in step S1 into metallized films of appropriate width, and then rolling them up;

[0010] S3, making a capacitor core package, winding the metallized film obtained in step S2 using a winding device to make a capacitor core package;

[0011] S4, placing the capacitor core package obtained in step S3 in an impregnation device for vacuum impregnation;

[0012] S5, spraying a metal layer, spraying a metal contact layer on the electrode parts at both ends of the capacitor core package after dipping, to form electrical contact with the capacitor core package electrodes;

[0013] S6. Welding the pins to the metal contact layer;

[0014] S7, packaging, packaging the capacitor core package obtained in step S6;

[0015] Step S4 includes the following steps:

[0016] S41, placing the capacitor core package to be impregnated into the impregnation equipment, and then evacuating the impregnation equipment, and controlling the vacuum degree in the impregnation equipment to a gas partial pressure of 0.2 to 0.5 Pa;

[0017] S42. Under the conditions of step S41, heat the impregnation liquid in the impregnation equipment to 65-70° C. and maintain the vacuum state for 30 minutes;

[0018] S43, performing annular extrusion on the immersed capacitor core package to squeeze as much gas dispersed in the capacitor core package as possible into one place, so that an exhaust channel is formed when the gas is discharged;

[0019] S44, take out the material, restore the air pressure in the impregnation equipment to normal pressure, and take out the impregnated capacitor core package.

[0020] Furthermore, the impregnation equipment includes a sealed container, which includes a box body and a sealing cover. The sealing cover is detachably sealed and fixed to the top of the box body. A vacuum tube is fixedly provided on one side of the top of the box body, and the other end of the vacuum tube is connected to the vacuum equipment. A drive box is fixed on the top of the box body, and a mounting block is fixed at a position opposite to the drive box in the box body. A plurality of clamping assemblies are rotatably connected to the side surfaces of the drive box and the mounting block. The relatively arranged clamping assemblies are symmetrically arranged, and the symmetrically arranged clamping assemblies fix the capacitor core package therebetween.

[0021] A transmission assembly is provided in the drive box. The drive input end of the transmission assembly is fixed to the drive end of the drive motor fixed outside the sealed container. The drive motor drives a plurality of clamping assemblies connected to the drive box to rotate through the transmission assembly. The relatively arranged clamping assemblies drive the capacitor core package to rotate.

[0022] A crossbeam is fixed between the drive box and the mounting block. A scraper is fixed on the side of the crossbeam close to the capacitor core package. The end of the scraper is pressed against the surface of the capacitor core package to perform circular extrusion on the rotating capacitor core package, squeezing multiple scattered small bubbles in the metallized film together to form a large bubble. The large bubbles are discharged to form an exhaust channel.

[0023] Furthermore, the clamping assembly includes a mounting block, a bidirectional threaded rod, a dovetail groove, a clamping block, a dovetail block, and a connecting shaft. One side of the mounting block is fixed to the connecting shaft, and the relatively arranged mounting blocks are rotatably connected to the drive box and the mounting block respectively through the connecting shaft. The connecting shaft is rotatably connected to the drive box and the mounting block respectively through a sealed bearing. A dovetail groove is provided on the side of the mounting block away from the connecting shaft, and a bidirectional threaded rod is passed through the dovetail groove. The bidirectional threaded rod is restricted from rotating in the dovetail groove. The dovetail blocks are passed through both ends of the bidirectional threaded rod, and the dovetail blocks are slidably set in the dovetail groove. The bidirectional threaded rod and the dovetail block are screwed together by threads. The dovetail block is located at one end outside the dovetail groove and is fixed to the clamping block. The end of the capacitor core package is set between the two clamping blocks. Rotating the bidirectional threaded rod can make the two dovetail blocks approach or move away from each other.

[0024] Furthermore, the transmission assembly includes a drive shaft, a driving bevel gear, and a driven bevel gear. The driven bevel gear is fixed to the connecting shaft at one end away from the mounting block. The driven bevel gear is located in the drive box. The driving bevel gear is engaged with the drive shaft. The drive shaft is fixedly inserted into the driving bevel gear. One end of the drive shaft passes through the drive box and the box body in sequence and extends to the outside of the box body. The end of the drive shaft located outside the box body is fixed to the rotating end of the drive motor, and the drive shaft is rotatably connected to the box body through a sealed bearing.

[0025] Furthermore, the scraper plate is passed through the crossbeam, and a plurality of fixing bolts are passed through the top surface of the crossbeam, and the fixing bolts are screwed with the crossbeam through threads.

[0026] Furthermore, the steps of impregnating the capacitor core package using the impregnation equipment are as follows:

[0027] Step 1: Covering the protective layer: Before impregnating the capacitor core package, a flexible film is first covered on one side of the capacitor core package to form a protective layer on the surface of the capacitor core package;

[0028] Step 2: Fix the capacitor core package and place it between the oppositely arranged clamping assemblies. Rotate the bidirectional threaded rod to drive the two clamping blocks closer to each other through the dovetail block. The two clamping blocks that are close to each other clamp the ends of the capacitor core package.

[0029] Step 3: Adjust the position of the scraper, place the end of the scraper against the surface of the capacitor core, and secure the scraper with the fixing bolts;

[0030] Step 4: inject the impregnation liquid until the level of the impregnation liquid covers the capacitor core package and is lower than the vacuum tube;

[0031] Step 5: seal the box body and seal the sealing cover to the box body;

[0032] Step 6: vacuuming the sealed container;

[0033] Step seven, drive the capacitor core package to rotate, start the drive motor, and the drive motor drives the clamping assembly to rotate through the transmission assembly. The clamping assembly drives the capacitor core package to rotate, and the scraping plate squeezes and scrapes the capacitor core package in turn along the rotation direction of the capacitor core package, squeezing and scraping the small bubbles scattered in the capacitor core package together to form a large bubble. When the air in the large bubble is discharged, an exhaust channel is formed.

[0034] Beneficial effects of the present invention:

[0035] The film capacitor manufacturing method of the present invention performs annular extrusion on the capacitor core package in the impregnated state, drives the capacitor core package to rotate, and uses a scraper to squeeze the capacitor core package in sequence along the rotation direction of the capacitor core package, squeezes and scrapes small bubbles scattered in the capacitor core package together to form a large bubble, which is convenient for the discharge of air between the metallized films. When the air is discharged, an exhaust channel is formed, and the impregnation liquid can enter the capacitor core package through this exhaust channel. Then, the impregnation liquid is evenly distributed between the metallized films under the scraping of the scraper. When the impregnation liquid is squeezed, the bubbles are squeezed again by the impregnation liquid, which can further discharge the air between the metallized films. Using this method, the capacitor core package has a better impregnation effect, and the quality and service life of the film container are effectively improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 The process of manufacturing the film capacitor of the present invention is as follows Figure 1 ;

[0037] Figure 2 The process of manufacturing the film capacitor of the present invention is as follows Figure 2 ;

[0038] Figure 3 This is a schematic structural diagram of a sealed container according to the present invention;

[0039] Figure 4 Schematic diagram of the internal structure of the sealed container of the present invention Figure 1 ;

[0040] Figure 5 Schematic diagram of the internal structure of the sealed container of the present invention Figure 2 ;

[0041] Figure 6 for Figure 5 The enlarged structural diagram at a in the middle;

[0042] Figure 7 This is a schematic diagram of the internal structure of the drive box of the present invention;

[0043] Figure 8 Schematic diagram of bubbles dispersed between metallized films of the present invention;

[0044] Figure 9 This is a schematic diagram of the dispersed bubbles between the metallized films of the present invention after squeezing and scraping.

[0045] In the figure: 1. Sealed container; 101. Box body; 102. Sealing cover; 2. Vacuum tube; 3. Drive motor; 4. Drive box; 5. Clamping assembly; 501. Mounting block; 502. Bidirectional threaded rod; 503. Dovetail groove; 504. Clamping block; 505. Dovetail block; 506. Connecting shaft; 6. Crossbeam; 61. Scraper; 62. Fixing bolt; 7. Capacitor core package; 8. Transmission assembly; 801. Drive shaft; 802. Active bevel gear; 803. Driven bevel gear; 9. Mounting block. DETAILED DESCRIPTION

[0046] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0047] It should be noted that when an element is referred to as being “fixed to” another element, it may be directly on the other element or there may be an intermediate element. When an element is referred to as being “connected to” another element, it may be directly connected to the other element or there may be an intermediate element.

[0048] Example

[0049] See also Figure 1 As shown, the method for manufacturing a thin film capacitor according to this embodiment includes the following steps:

[0050] Step one, metallization, using an evaporation device to evaporate a layer of metal on the surface of the film, the metal is aluminum metal particles, and a metal layer is formed on the surface of the film; step two, film slitting, the metallized film obtained in step one is slitting using a slitting device, slitting it into metallized films of appropriate width, and then winding it; step three, making a capacitor core package, the metallized film obtained in step two is wound using a winding device to make a capacitor core package; step four, the capacitor core package obtained in step three is placed in an impregnation device for vacuum impregnation, the gas in the capacitor core package is removed, and the impregnation liquid fills the gaps between the capacitor core packages to improve the electrical performance of the product, and the impregnation liquid used is silicone oil; step five, spraying a metal layer, spraying a metal contact layer on the electrode parts at both ends of the capacitor core package after impregnation to form electrical contact with the capacitor core package electrodes, the metal for spraying the metal is liquid metal, and the metal is tin, zinc or aluminum, etc.; step six, welding pins, welding the pins on the metal contact layer; step seven, packaging, packaging the capacitor core package obtained in the sixth step.

[0051] See also Figure 2 As shown, step four includes the following steps:

[0052] Step 1: Place the capacitor core package to be impregnated into the impregnation equipment, and then evacuate the impregnation equipment. The vacuum degree in the impregnation equipment is controlled at a gas partial pressure of 0.2 to 0.5 Pa;

[0053] Step 2: Under the conditions of step 1, heat the impregnation liquid in the impregnation equipment to 65-70°C and maintain the vacuum state for 30 minutes;

[0054] Step three: perform annular extrusion on the impregnated capacitor core package to squeeze as much of the dispersed gas in the capacitor core package as possible into one place, forming bubbles between the metal films, accelerating the gas discharge speed, and improving the impregnation effect.

[0055] Step 4: Take the material, restore the air pressure in the impregnation equipment to normal pressure, and take out the impregnated capacitor core package.

[0056] To facilitate understanding of the operation of annularly extruding the capacitor core package in the impregnated state, the specific structure of the impregnation equipment used in this embodiment will be described below in conjunction with the accompanying drawings of the present invention.

[0057] See also Figure 3 As shown, the impregnation equipment includes a sealed container 1, which includes a box body 101 and a sealing cover 102. The sealing cover 102 is sealed and fixed on the top of the box body 101. A vacuum tube 2 is fixedly provided on one side of the top of the box body 101. The other end of the vacuum tube 2 is connected to a vacuum device (not shown in the figure), and the sealed container 1 is vacuumed through the vacuum tube 2.

[0058] See also Figure 4 、 5 As shown, a driving box 4 is fixed on the top of the box body 101, and a mounting block 9 is fixed relative to the driving box 4 in the box body 101. The driving box 4 is connected to a plurality of clamping components 5 by rotating away from the side of the box body 101. The side of the mounting block 9 is also connected to a plurality of clamping components 5 by rotating. The relatively arranged clamping components 5 are symmetrically arranged. The symmetrically arranged clamping components 5 fix the capacitor core package therebetween. Specifically, the clamping components 5 clamp both ends of the capacitor core package, such as Figure 5 shown.

[0059] See also Figure 7 As shown, a transmission assembly 8 is provided in the drive box 4. The drive input end of the transmission assembly 8 is fixed to the drive end of the drive motor 3 fixed to the outside of the sealed container 1. The drive motor 3 drives a plurality of clamping assemblies 5 connected to the drive box 4 to rotate through the transmission assembly 8. The rotation direction of the clamping assembly 5 is as shown in FIG. Figure 5 As shown in the direction A, the relatively arranged clamping components 5 drive the capacitor core package 7 to rotate.

[0060] See also Figure 5 As shown, a crossbeam 6 is fixed between the drive box 4 and the mounting block 9, and a scraper 61 is fixed on the side of the crossbeam 6 close to the capacitor core package 7. The end of the scraper 61 is against the surface of the capacitor core package 7, and the rotating capacitor core package 7 is annularly squeezed to squeeze and scrape multiple scattered small bubbles in the metallized film together to form a large bubble, such as Figure 8 、 Figure 9 As shown, it is convenient for air to be discharged between the metallized films.

[0061] Please refer to 4. Figure 6 As shown, the clamping assembly 5 includes a mounting block 501, a bidirectional threaded rod 502, a dovetail groove 503, a clamping block 504, a dovetail block 505, and a connecting shaft 506. One side of the mounting block 501 is fixed to the connecting shaft 506. The relatively arranged mounting blocks 501 are rotatably connected to the drive box 4 and the mounting block 9 respectively through the connecting shaft 506. The connecting shaft 506 is rotatably connected to the drive box 4 and the mounting block 9 respectively through a sealed bearing to prevent the immersion liquid from entering the drive box 4. A dovetail groove 503 is provided on the side of the mounting block 501 away from the connecting shaft 506. The bidirectional threaded rod 502 is passed through the dovetail groove 503. The bidirectional threaded rod 502 is restricted to rotate in the dovetail groove 503. Dovetail blocks 505 are provided at both ends of the bidirectional threaded rod 502. The dovetail blocks 505 are slidably set in the dovetail groove 503. The bidirectional threaded rod 502 and the dovetail block 505 are screwed together by threads. The dovetail block 505 is located at one end outside the dovetail groove 503 and is fixed with a clamping block 504. The end of the capacitor core package 7 is set between the two clamping blocks 504. Rotating the bidirectional threaded rod 502 can make the two dovetail blocks 505 approach or move away from each other, and then the dovetail block 505 drives the clamping block 504 to approach and move away from each other, thereby clamping and loosening the end of the capacitor core package 7.

[0062] See also Figure 7 As shown, the transmission assembly 8 includes a driving shaft 801, a driving bevel gear 802, and a driven bevel gear 803. The driven bevel gear 803 is fixed to the connecting shaft 506 at one end away from the mounting block 501. The driven bevel gear 803 is located in the driving box 4. The driving bevel gear 802 is engaged with the driving shaft 801. The driving shaft 801 is fixedly penetrated in the driving bevel gear 802. One end of the driving shaft 801 sequentially passes through the driving box 4 and the box body 101 and extends to the outside of the box body 101. The driving shaft 801 is located outside the box body 101 and is rotatably connected to the rotating end of the driving motor 3. The driving shaft 801 is fixed to the box body 101 through a sealed bearing to ensure the overall airtightness of the sealed container 1. The sealed bearing can also be replaced by other existing suitable sealed rotating parts. This embodiment only uses it and does not improve it.

[0063] When in use, start the drive motor 3, the drive motor 3 drives the drive shaft 801 to rotate, the drive shaft 801 drives the active bevel gear 802 to rotate, the active bevel gear 802 drives the driven bevel gear 803 to rotate, and the driven bevel gear 803 drives the connecting shaft 506 to rotate, that is, drives several clamping components 5 to rotate simultaneously.

[0064] See also Figure 5 As shown, the scraper plate 61 is passed through the crossbeam 6, and a plurality of fixing bolts 62 are passed through the top surface of the crossbeam 6. The fixing bolts 62 are screwed into the crossbeam 6 through threads, and the extension length of the scraper plate 61 can be adjusted to facilitate the end of the scraper plate 61 to contact the capacitor core package 7 of different thicknesses.

[0065] The working principle of the impregnation equipment of this embodiment: Step 1, applying a protective layer. In order to reduce the wear of the scraper 61 on the surface of the capacitor core package 7, before impregnating the capacitor core package 7, a side film is first applied to the capacitor core package 7. The mold can be made of the same material as the metal film or other flexible film and is applied or wrapped on the surface of the capacitor core package 7 to form a protective layer.

[0066] Step 2: Fix the capacitor core package 7 and place it between the relatively arranged clamping components 5. Rotate the bidirectional threaded rod 502 to drive the two clamping blocks 504 to approach each other through the dovetail block 505. The two clamping blocks 504 approaching each other clamp the ends of the capacitor core package 7.

[0067] Step three: adjust the position of the scraper plate 61 , place the end of the scraper plate 61 against the surface of the capacitor core package 7 , and fix the scraper plate 61 with the fixing bolt 62 .

[0068] Step 4: inject the impregnation liquid. The level of the impregnation liquid should be above the capacitor core package 7 and lower than the vacuum tube 2. This can prevent the impregnation liquid from being drawn out during vacuuming.

[0069] Step five: seal the box body 101 and seal and fix the sealing cover 102 to the box body 101.

[0070] Step six: evacuate the sealed container 1.

[0071] Step 7: Drive the capacitor core package 7 to rotate, start the drive motor 3, drive the clamping assembly 5 to rotate through the transmission assembly 8, and the clamping assembly 5 drives the capacitor core package 7 to rotate, and the scraper 61 moves along the Figure 5The capacitor core package 7 is squeezed and scraped in the middle A direction in turn to squeeze and scrape the small bubbles scattered in the capacitor core package 7 together to form a large bubble, which is convenient for the discharge of air between the metallized films. When the air is discharged, an exhaust channel is formed, and the impregnation liquid can enter the capacitor core package 7 through this exhaust channel, and then the impregnation liquid is evenly distributed between the metallized films under the scraping of the scraper 61. When squeezing the impregnation liquid, the bubbles are squeezed again by the impregnation liquid, and the air between the metallized films can be further discharged. Using this method, the impregnation effect of the capacitor core package 7 is better, and the quality and service life of the film container are effectively improved.

[0072] It should be noted that, in this document, if there are relational terms such as first and second, etc., they are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "comprises", "comprising" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprising a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element.

[0073] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A method for manufacturing a film capacitor, characterized in that: The following steps are included: S1, metallization, using evaporation equipment to evaporate a layer of metal on the surface of the film; S2, film slitting, using a slitting device to slit the metallized film obtained in step S1 into metallized films of appropriate width, and then rolling them up; S3, making a capacitor core package, winding the metallized film obtained in step S2 using a winding device to make a capacitor core package; S4, placing the capacitor core package obtained in step S3 in an impregnation device for vacuum impregnation; S5, spraying a metal layer, spraying a metal contact layer on the electrode parts at both ends of the capacitor core package after dipping, to form electrical contact with the capacitor core package electrodes; S6. Welding the pins to the metal contact layer; S7, packaging, packaging the capacitor core package obtained in step S6; Step S4 includes the following steps: S41, placing the capacitor core package to be impregnated into the impregnation equipment, and then evacuating the impregnation equipment, and controlling the vacuum degree in the impregnation equipment to a gas partial pressure of 0.2 to 0.5 Pa; S42. Under the conditions of step S41, heat the impregnation liquid in the impregnation equipment to 65-70° C. and maintain the vacuum state for 30 minutes; S43, performing an annular extrusion on the immersed capacitor core package to squeeze and scrape the gas dispersed in the capacitor core package to form an exhaust channel when the gas is discharged; S44, taking out the material, restoring the air pressure in the impregnation equipment to normal pressure, and taking out the impregnated capacitor core package; The impregnation device comprises a sealed container (1), the sealed container (1) comprises a box body (101), a sealing cover (102), the sealing cover (102) is detachably sealed and fixed on the top of the box body (101), a vacuum pumping tube (2) is fixedly provided on one side of the top of the box body (101), the other end of the vacuum pumping tube (2) is connected to the vacuum pumping device, a driving box (4) is fixed on the top of the box body (101), a first mounting block (9) is fixed at a relative position of the driving box (4) in the box body (101), a plurality of clamping assemblies (5) are rotatably connected to the side of the driving box (4) and the side of the first mounting block (9), the relatively arranged clamping assemblies (5) are symmetrically arranged, and the symmetrically arranged clamping assemblies (5) fix the capacitor core package (7) therebetween; A transmission assembly (8) is provided in the drive box (4), and a drive input end of the transmission assembly (8) is fixed to a drive end of a drive motor (3) fixed outside the sealed container (1). The drive motor (3) drives a plurality of clamping assemblies (5) connected to the drive box (4) to rotate through the transmission assembly (8), and the clamping assemblies (5) arranged opposite to each other drive the capacitor core package (7) to rotate. A crossbeam (6) is fixed between the drive box (4) and the first mounting block (9), and a scraping plate (61) is fixed on one side of the crossbeam (6) close to the capacitor core package (7). The end of the scraping plate (61) abuts against the surface of the capacitor core package (7) to perform annular extrusion on the rotating capacitor core package (7), thereby scraping together a plurality of dispersed small bubbles in the metallized film to form a large bubble, and the large bubble is discharged to form an exhaust channel.

2. The method for manufacturing a thin film capacitor according to claim 1, wherein: The clamping assembly (5) comprises a second mounting block (501), a bidirectional threaded rod (502), a dovetail groove (503), a clamping block (504), a dovetail block (505), and a connecting shaft (506). One side of the second mounting block (501) is fixed to the connecting shaft (506). The second mounting blocks (501) arranged opposite to each other are rotatably connected to the drive box (4) and the first mounting block (9) through the connecting shaft (506). The connecting shaft (506) is rotatably connected to the drive box (4) and the first mounting block (9) through a sealed bearing. A dovetail groove (503) is provided on one side of the second mounting block (501) away from the connecting shaft (506). A bidirectional threaded rod (502) is provided in the dovetail groove (503), the bidirectional threaded rod (502) is restricted to rotate in the dovetail groove (503), a dovetail block (505) is provided at both ends of the bidirectional threaded rod (502), the dovetail block (505) is slidably provided in the dovetail groove (503), the bidirectional threaded rod (502) and the dovetail block (505) are screwed together by threads, the dovetail block (505) is located at one end outside the dovetail groove (503) and is fixed to the clamping block (504), the end of the capacitor core package (7) is provided between the two clamping blocks (504), and the two dovetail blocks (505) can be moved closer to or away from each other by rotating the bidirectional threaded rod (502).

3. The method for manufacturing a thin film capacitor according to claim 2, wherein: The transmission assembly (8) comprises a driving shaft (801), a driving bevel gear (802), and a driven bevel gear (803). The driven bevel gear (803) is fixed to one end of the connecting shaft (506) away from the second mounting block (501). The driven bevel gear (803) is located in the driving box (4). The driving bevel gear (802) is meshed with the driving shaft (801). The driving shaft (801) is fixedly arranged in the driving bevel gear (802). One end of the driving shaft (801) sequentially passes through the driving box (4) and the box body (101) and extends to the outside of the box body (101). One end of the driving shaft (801) located outside the box body (101) is fixed to the rotating end of the driving motor (3). The driving shaft (801) is rotatably connected to the box body (101) through a sealed bearing.

4. The method for manufacturing a thin film capacitor according to claim 3, wherein: The extrusion scraper (61) is inserted into the cross beam (6), and a plurality of fixing bolts (62) are inserted into the top surface of the cross beam (6). The fixing bolts (62) are screwed together with the cross beam (6) through threads.

5. The method for manufacturing a thin film capacitor according to claim 4, wherein: The steps of impregnating the capacitor core package using the impregnation device are as follows: Step 1, providing a protective layer. Before impregnating the capacitor core package (7), a flexible film is provided on one side of the capacitor core package (7) to form a protective layer on the surface of the capacitor core package (7); Step 2: fix the capacitor core package (7), place the capacitor core package (7) between the clamping assemblies (5) arranged opposite to each other, rotate the bidirectional threaded rod (502) to drive the two clamping blocks (504) to approach each other through the dovetail block (505), and the two clamping blocks (504) approaching each other clamp the ends of the capacitor core package (7); Step 3: Adjust the position of the scraper (61), place the end of the scraper (61) against the surface of the capacitor core package (7), and fix the scraper (61) with a fixing bolt (62); Step 4: injecting the impregnation liquid, wherein the level of the impregnation liquid overflows the capacitor core package (7) and is lower than the vacuum tube (2); Step 5: sealing the box body (101), and sealing and fixing the sealing cover (102) to the box body (101); Step 6: vacuuming the sealed container (1); Step seven, driving the capacitor core package (7) to rotate, starting the driving motor (3), the driving motor (3) drives the clamping component (5) to rotate through the transmission component (8), the clamping component (5) drives the capacitor core package (7) to rotate, the scraping plate (61) sequentially squeezes and scrapes the capacitor core package (7) along the rotation direction of the capacitor core package (7), and squeezes and scrapes the small bubbles dispersed in the capacitor core package (7) together to form a large bubble, and when the air in the large bubble is discharged, an exhaust channel is formed.

6. Film capacitors, characterized in that: The thin film capacitor is manufactured according to any one of claims 1 to 5.

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