End sealing method of disc type capacitor and end sealing tool thereof

Abstract

The invention relates to an end sealing method of a disc type capacitor and an end sealing tool thereof, and the end sealing method comprises the following steps: S1, fixing a disc type capacitor (15) to be subjected to end sealing, and enabling the central axis of the disc type capacitor (15) to be vertical to a horizontal plane; s2, a first surface (151), parallel to the horizontal plane, of the disc type capacitor (15) is coated with electrode slurry with fluidity, the electrode slurry flows to an inner end face (154) perpendicular to the first surface (151), then the electrode slurry covering the inner end face (154) is solidified, an inner end electrode (1540) is formed, and the first surface (151) is parallel to the horizontal plane. The inner end electrode formed by the end sealing method is good in adhesion effect, the formed inner end electrode can be ensured to be connected with all inner electrodes in the disc type capacitor, the failure ratio of the capacitor is reduced, and the production efficiency can be effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of capacitors, and in particular to a sealing method for a disc capacitor and a sealing tool thereof. Background Art

[0002] A feedthrough capacitor is a three-terminal capacitor. Compared with an ordinary three-terminal capacitor, it is directly mounted on a metal panel, so its connection inductance is smaller and there is almost no influence of lead inductance. In addition, its input and output terminals are isolated by metal plates, eliminating high-frequency coupling, which makes the feedthrough capacitor have a filtering effect close to that of an ideal capacitor, and is therefore widely used.

[0003] Existing through-hole capacitors usually use disc capacitors as filter capacitors, such as Figure 1 As shown, the through-hole capacitor 1 includes a cylindrical housing 11 and a lead pin 13 penetrating the housing 11, and a disc capacitor 15 is arranged in the housing 11. Figure 2 As shown, the disc capacitor 15 is annular in shape as a whole, and its internal structure is similar to that of MLCC. It is usually made by staggered stacking of ceramic dielectric material 1500 and metal inner electrode 1502 to form a laminate, and then a central inner hole 155 is processed at the center of the laminate to penetrate the upper surface (i.e., the first surface 151) and the lower surface (i.e., the second surface 152) thereof, so as to allow the lead pin 13 to pass through. The outer end surface 153 and the inner end surface 154 of the laminate are both provided with a metal layer connected to the inner electrode 1502, which are the outer end electrode and the inner end electrode, respectively.

[0004] Generally, the capacitor is in the shape of a rectangular parallelepiped (such as MLCC), which includes a stack formed by staggered stacking of ceramic materials and metal internal electrodes, and end electrodes coated on both ends of the stack along its length. When preparing MLCC, after the stack is formed, a slurry dipping process is usually used to achieve end sealing, specifically: the two ends of the stack are immersed in the electrode slurry respectively, and then the electrode slurry is burned to form the end electrodes. However, due to the particularity of the position of the central inner hole 155 of the through-hole capacitor 15, it is impossible to achieve end sealing by the slurry dipping process. Therefore, conventionally, the following two methods are usually used to seal the disk capacitor 15 (especially the center inner hole 155): one is to apply non-fluid solder paste to the side wall of the center inner hole 155 of the disk capacitor 15, and then pass the lead pin 13 through the center inner hole 155 coated with solder paste, and then connect the lead pin 13 to the inner electrode 1502 of the disk capacitor 15 by direct welding, so as to lead out the inner end electrode 1540 of the disk capacitor 15. However, this method is affected by the agglomeration of solder paste, and cannot ensure the connection of all the inner electrodes 1502 in the stack, and cannot make all the inner electrodes 1502 connected in parallel, thereby causing a large proportion of capacitor failure. ; The other method is to activate the surface of the stack by corrosion, and then plate the outer surface of the stack (including its upper surface, lower surface, outer end face 153 and inner end face 154) with a metal layer by chemical precipitation electroplating, and then remove the metal layers on the upper and lower surfaces by grinding, so that the metal electrodes on the outer end face 153 and the inner end face 154 are not connected to each other. However, the metal layer formed in this way has unsatisfactory adhesion effect on the outer end face 153 and the inner end face 154 of the stack, and the corrosion process can easily cause irreversible damage to the stack, thereby reducing the performance of the capacitor. In addition, the grinding process is relatively complicated and the production efficiency is low. Summary of the invention

[0005] Based on this, the purpose of the present invention is to overcome the defects or shortcomings of the prior art. On the one hand, a method for sealing a disc capacitor is provided, in which the inner terminal electrode formed has a good adhesion effect, and at the same time can ensure that the formed inner terminal electrode can connect all the inner electrodes in the disc capacitor, thereby reducing the failure rate of the capacitor, and can seal batches of disc capacitors, effectively improving production efficiency.

[0006] A method for sealing a disc capacitor comprises the following steps:

[0007] S1: Fix the disc capacitor to be sealed so that the central axis of the disc capacitor is perpendicular to the horizontal plane;

[0008] S2: Applying a fluid electrode slurry to the first surface of the disc capacitor parallel to the horizontal plane, allowing the electrode slurry to flow to the inner end surface perpendicular to the first surface, and then curing the electrode slurry covering the inner end surface to form an inner end electrode.

[0009] Compared with the prior art, based on the annular structure of the disc capacitor, the end-sealing method of the present invention converts the fluid electrode slurry coated on the first surface of the disc capacitor parallel to the horizontal plane in the horizontal direction into a flow on the inner end surface perpendicular to the horizontal direction, so that the electrode slurry can cover the inner end surface of the disc capacitor, and then the electrode slurry on the inner end surface is burned and solidified to form an inner end electrode.

[0010] In one embodiment, in step S2, the electrode slurry is made to flow to an outer end surface perpendicular to the first surface (, and then the electrode slurry covering the outer end surface is cured to form an outer end electrode.

[0011] In one embodiment, the termination method of the disc capacitor further comprises the following steps:

[0012] S3: Apply the electrode slurry to the second surface of the disc capacitor parallel to the first surface, allowing the electrode slurry to flow to the inner end surface and / or the outer end surface, and then cure the electrode slurry so that the formed inner end electrode completely covers the inner end surface, and / or the formed outer end electrode completely covers the outer end surface.

[0013] In one embodiment, in step S2 and step S3, the electrode slurry is coated on the first surface and the second surface of the disc capacitor by screen printing, and the screen printing method is: covering the first surface or the second surface with a coating template, coating the electrode slurry on the top surface of the coating template, and then scraping the electrode slurry in a horizontal direction with a scraper, so that the electrode slurry seeps out from the bottom surface of the coating template and flows to the inner end surface and the outer end surface of the disc capacitor.

[0014] In one embodiment, the viscosity of the electrode slurry is 2-4 kcps.

[0015] On the other hand, in order to realize the above-mentioned end-sealing method, the present invention further provides an end-sealing tool for a disc capacitor, which is used to cover the first surface or the second surface of the disc capacitor to serve as a coating template for the electrode slurry, wherein the first surface and the second surface are parallel to the horizontal plane, and include an end-sealing plate body, and the end-sealing plate body is provided with a slurry structure that penetrates its top surface and the ground surface; the material of the slurry structure is a material with pores inside to allow the electrode slurry to penetrate in and out; the slurry structure includes a first slurry member, and when the end-sealing tool is covered on the first surface or the second surface of the disc capacitor, the orthographic projection of the first slurry member on the horizontal plane completely covers the orthographic projection of the inner end surface of the disc capacitor perpendicular to the first surface on the horizontal plane, so that the electrode slurry seeping from the slurry structure flows to the inner end surface.

[0016] In one embodiment, the first slurry-permeable member is in the shape of a circular ring. When the end sealing tool covers the first surface or the second surface, the orthographic projection of the first slurry-permeable member on the horizontal plane has a first outer circle contour and a first inner circle contour, and the orthographic projection of the inner end surface of the disc capacitor on the horizontal plane is located between the first outer circle contour and the first inner circle contour.

[0017] In one embodiment, the slurry infiltration structure further includes a second slurry infiltration member, which is arranged on the outer peripheral side of the first slurry infiltration member. When the end sealing tool covers the first surface or the second surface, the orthographic projection of the second slurry infiltration member on the horizontal plane completely covers the orthographic projection of the outer end surface of the disc capacitor perpendicular to the first surface on the horizontal plane, so that the electrode slurry seeping from the slurry infiltration structure flows to the outer end surface.

[0018] In one embodiment, the second slurry permeating member is annular, and the orthographic projection of the second slurry permeating member on the horizontal plane has a second outer circle contour and a second inner circle contour, and the orthographic projection of the outer end surface of the disc capacitor on the horizontal plane is located between the second outer circle contour and the second inner circle contour.

[0019] In one embodiment, the material of the slurry structure is any one of latex, silicone and rubber.

[0020] For better understanding and implementation, the present invention is described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of an existing feedthrough capacitor;

[0022] Figure 2 It is a structural schematic diagram of an existing disc capacitor used for feedthrough capacitance;

[0023] Figure 3 A top view of an embodiment of a fixing fixture for a disc capacitor of the present invention;

[0024] Figure 4 A top view of an embodiment of a grouting structure in a fixing tool of a disc capacitor of the present invention;

[0025] Figure 5 A top view of an embodiment of a sealing tool for a disc capacitor of the present invention;

[0026] Figure 6 A cross-sectional view of an embodiment of a sealing tool for a disc capacitor of the present invention;

[0027] Figure 7 A schematic diagram of the structure of a disc capacitor obtained by the sealing method of the present invention;

[0028] Figure 8 It is a cross-sectional view of another embodiment of the terminal sealing tool for the disc capacitor of the present invention.

[0029] Reference numerals:

[0030] 1. Through-hole capacitor; 11. Through-hole capacitor housing; 13. Through-hole capacitor lead pin; 15. Disc capacitor; 1500. Ceramic dielectric material; 1502. Inner electrode; 151. First surface; 152. Second surface; 153. Outer end surface; 1530. Outer end electrode; 1530a. Outer end electrode flange; 154. Inner end surface; 1540. Inner end electrode; 1540a. Inner end electrode flange; 155. Center inner hole;

[0031] 10. End-sealing tool; 100. End-sealing plate; 102. Slurry penetration structure; 1021. First slurry penetration member; 1021a. First outer ring profile; 1021b. First inner ring profile; 1022. Second slurry penetration member; 1022a. Second outer ring profile; 1022b. Second inner ring profile;

[0032] 20. Fixing tooling; 200. Fixing plate; 202. Accommodating hole.

[0033] 30. Scraper. DETAILED DESCRIPTION

[0034] Since the core component of the through-hole capacitor, the disc capacitor, is in a circular ring structure, it is impossible to use the slurry dipping process to seal the central inner hole in the middle. The existing method of welding the inner end face to the lead pin to lead out the inner electrode is prone to the solder paste coated in the central inner hole agglomeration, which makes the lead pin unable to connect with all the inner electrodes, and then all the inner electrodes cannot be connected in parallel, resulting in a large proportion of capacitor failure; and the sealing method of first corroding the laminate of the disc capacitor, then electroplating the entire outer surface of the laminate to form a metal layer, and then removing the metal on the upper and lower surfaces of the laminate by grinding, the metal layer is not ideally attached to the end face, and the corrosion treatment is easy to cause irreversible damage to the laminate, so that the electrical performance of the disc capacitor obtained is reduced. At the same time, the grinding process is complicated and cumbersome, and the production efficiency is low.

[0035] Based on the annular structure of the disc capacitor, the end-sealing method of the present invention coats the first surface of the disc capacitor parallel to the horizontal plane with a fluid electrode slurry in the horizontal direction, so that the slurry flows on the inner end surface perpendicular to the first surface, and then performs a burn-end treatment on the electrode slurry to form an inner end electrode on the inner end surface; further, the present invention provides an end-sealing tooling used as a coating template for the electrode slurry to convert the coating in the horizontal direction into flowing in the vertical direction, so that the electrode slurry covers the inner end surface of the disc capacitor, so as to overcome the defects of the above two methods of sealing the inner end surface of the disc capacitor.

[0036] Based on the above preparation design ideas, the following Figure 2 Taking the disk capacitor 15 as an example, the termination method for the disk capacitor of the present invention is described in detail.

[0037] An embodiment of the method for sealing a disc capacitor of the present invention comprises the following steps:

[0038] S1: Fix the disc capacitor 15 to be sealed so that the central axis of the disc capacitor 15 is perpendicular to the horizontal plane;

[0039] Specifically, the disk capacitor 15 is fixed horizontally at Figure 3 The fixing tool 20 shown in FIG. Figure 3 As shown, the fixing tool 20 includes a fixing plate body 200 and an array of accommodating holes arranged on the fixing plate body 200, the array of accommodating holes includes a plurality of accommodating holes 202, each accommodating hole 202 is circular and adapted to the outer peripheral contour of the disc capacitor 15, and its aperture is greater than or equal to the outer diameter of the disc capacitor 15; the accommodating hole 202 is specifically a through hole, and can be a through hole, and a first adhesive tape is adhered to the bottom of the fixing plate body 200, and when the disc capacitor 15 is placed in the accommodating hole 202, the position of the disc capacitor 15 is fixed by the adhesion of the first adhesive tape; of course, the accommodating hole 202 can also be a blind hole, and when the accommodating hole 202 is a blind hole, a first adhesive tape can be arranged on the bottom wall of the accommodating hole 202, so as to fix the disc capacitor 15 at the center position of the accommodating hole 202 by bonding; when the accommodating hole 202 is a through hole, the first adhesive tape can be arranged at the bottom of the fixing plate body 200 and cover all the accommodating holes 202.

[0040] S2: Apply fluid electrode slurry to the first surface 151 of the disc capacitor 15 parallel to the horizontal plane, allow the electrode slurry to flow to the inner end surface 154 perpendicular to the first surface 151 , and then solidify the electrode slurry on the inner end surface 154 to form an inner end electrode 1540 .

[0041] The specific steps include:

[0042] S21: preparing a sealing tool 10, which is used as a coating template for electrode slurry.

[0043] Specifically, the end-sealing tool 10 includes an end-sealing plate body 100 and at least one grouting structure 102 disposed on the end-sealing plate body 100 and penetrating through the top and bottom surfaces of the end-sealing plate body 100 and corresponding to the receiving hole 202 of the fixing tool 20. Figure 4-5As shown, the end plate body 100 is rectangular as a whole and is made of a material with high density; each slurry structure 102 includes a first slurry member 1021, which is a circular ring with a certain thickness along the radial direction, and is made of a polymer material with toughness and pores inside.

[0044] S22: first, horizontally cover the first surface 151 of the fixed disk capacitor 15 with the end-sealing tool 10 , then apply the electrode slurry with fluidity to the top surface of the end-sealing tool 10 , and then scrape the electrode slurry in the horizontal direction with the scraper 30 .

[0045] like Figure 6 As shown, when the sealing tool 10 is covered on the first surface 151 of the disc capacitor 15, the orthographic projection of the first slurry member 1021 on the horizontal plane completely covers the orthographic projection of the inner end surface 154 of the disc capacitor 15 on the horizontal plane, wherein the inner end surface 154 is perpendicular to the first surface 151.

[0046] Since the end-capping plate 100 is made of a material with high density, and the first slurry member 1021 is made of a material with internal pores and toughness, during the scraping process of the scraper 30, the electrode slurry can only flow from the first slurry member 1021 to the disc capacitor 15 at the bottom thereof, and cannot penetrate through the end-capping plate 100. During printing, the electrode slurry is first poured onto the top surface of the end-capping tool 10. At this time, the electrode slurry with a certain viscosity is in a static state, and it will not penetrate the end-capping tool 10 and flow to the disc capacitor 15. As the scraper 30 scrapes the electrode slurry in the horizontal direction, the first slurry member 1021 is deformed under the action of the scraper 30, so that the electrode slurry penetrates from the top of the first slurry member 1021, and seeps out from the bottom of the first slurry member 1021 to the inner end surface 154 of the disc capacitor 15, and flows down along the inner end surface 154 and covers the inner end surface 154. The electrode slurry on the inner end surface 154 is solidified after being treated by the end-firing process, forming a Figure 8 The inner electrode 1540 is shown. The scraper 30 is preferably made of a flexible material, such as rubber or silicone. The toughness of the first slurry member 1021 and the flexibility of the scraper 30 provide a buffer force for the scraping process, thereby ensuring the service life of the end-sealing tool 10 and ensuring steady development of production control.

[0047] In this embodiment, the end-capping plate 100 is specifically made of latex, and the pores inside the latex are first pores; the first slurry member 1021 is also made of latex, and the pores inside the latex are second pores, wherein the first pores have a small pore diameter, and the size of the second pores is larger than the size of the first pores, so that the electrode slurry can only flow out through the first slurry member 1021 under the action of the scraper 30, and cannot penetrate from the end-capping plate 100. In practical applications, the end-capping plate 100 and the first slurry member 1021 can be made of latex materials with different densities, respectively, so that the two have pores with different sizes inside, and then the two are assembled together; or the same latex material can be used to form an integral end-capping tool, and then the latex inside the position of the first slurry member 1021 is etched to form larger pores.

[0048] The viscosity of the electrode slurry can be adjusted according to the material of the penetration structure 1002. When the penetration structure 1002 is made of latex material, the viscosity of the electrode slurry is controlled between 2 and 4 kcps, preferably 3 kcps. When the first penetration member 1021 is made of latex, if the viscosity is lower than 2 kcps, the fluidity of the electrode slurry is large. After the end sealing is completed, when the disc capacitor 15 is transferred to the end burning process, the electrode slurry is easy to overflow and contaminate the tooling used in the end burning process; if the viscosity is greater than 4 kcps, the fluidity of the electrode slurry is small, and it is not easy to slurry out even when scraped by the scraper 30, and it is impossible to form a sag on the inner end surface 154 of the disc capacitor 15.

[0049] In addition to latex, the material of the first slurry penetration member 1021 can also be silicone or rubber, among which latex is preferred, because the pore size of latex is moderate and evenly distributed, and it is easier to control the amount of electrode slurry seepage. In addition to latex with high density, the material of the end plate body 100 can also be metal, plastic or other high-density materials, as long as it is ensured that the electrode slurry will not seep through the end plate body 100 during the scraping and pressing process of the scraper 30. Among them, latex with high density is preferred. The end plate body 100 made of latex will be deformed under the scraping and pressing action of the scraper 30, thereby producing an extrusion effect on the electrode slurry, which is conducive to rapid slurry discharge. When the material of the end sealing plate body 100 is a soft material such as latex, silicone or rubber, the side of the slurry structure 102 in contact with the scraper 30 is flush with the adjacent end sealing plate body 100; when the material of the end sealing plate body 100 is a hard material such as metal, plastic, etc., the side of the slurry structure 102 in contact with the scraper 30 slightly protrudes from the adjacent end sealing plate body 100 so as to be deformed under the scraping and pressing action of the scraper 30.

[0050] The specific composition of the above-mentioned electrode slurry and the firing process are prior arts, so they will not be described in detail here.

[0051] In this way, by adopting the screen printing method and the sealing tool 10 with a special structure, the fluid electrode slurry coated on the first surface 151 of the disc capacitor 15 parallel to the horizontal plane in the horizontal direction is converted into a flow on the inner end surface 154 perpendicular to the horizontal direction, so that the electrode slurry can cover the inner end surface 154 of the disc capacitor 15, and then the electrode slurry on the inner end surface 154 is burned and solidified to form an inner end electrode 1540.

[0052] Similarly, the outer end surface 153 of the disk capacitor 15 can also be sealed by the same hanging method as above. Figure 5 As shown, in order to seal the outer end surface 153, the above-mentioned slurry structure 102 further includes a second slurry member 1022 arranged around the outer periphery of the first slurry member 1021. The second slurry member 1022 is a circular ring concentric with the first slurry member 1021 and has a certain thickness in the radial direction. Figure 6 As shown, when the end-sealing tool 10 covers the first surface 151 of the disc capacitor 15, the orthographic projection of the second slurry member 1022 on the horizontal plane completely covers the orthographic projection of the outer end surface 153 of the disc capacitor 15 on the horizontal plane, wherein the outer end surface 153 is perpendicular to the first surface 151. The material of the second slurry member 1022 is also made of a polymer material with internal pores and toughness to allow the electrode slurry to penetrate in and out. During the process of scraping the electrode slurry with the scraper 30 in the horizontal direction, the electrode slurry seeps out from the bottom of the second slurry member 1022 to the outer end surface 153 of the disc capacitor 15, and flows down along the outer end surface 153 and covers the outer end surface 153. The electrode slurry on the outer end surface 153 is solidified after being treated with the sintering process to form a Figure 8 When the sealing tool 10 is used to seal the outer end surface 153 of the disc capacitor 15 in the above manner, the aperture of the receiving hole 202 of the fixing tool 20 is preferably larger than the outer diameter of the disc capacitor 15, so as to leave a gap for the electrode slurry that flows on the end surface of the disc capacitor 15 in the subsequent process, so as to prevent the electrode slurry that flows on the outer end surface 153 from contaminating the fixing tool 20.

[0053] When the sealing tool 10 covers the first surface 151 of the disc capacitor 15, the orthographic projection of the first annular slurry member 1021 on the horizontal plane has an outer circle contour and an inner circle contour, which are the first outer circle contour 1021a and the first inner circle contour 1021b respectively; similarly, the orthographic projection of the second annular slurry member 1022 on the horizontal plane also has an outer circle contour and an inner circle contour, which are the second inner circle contour 1022a and the second outer circle contour 1022b respectively. In some embodiments, the orthographic projection of the inner end surface 154 of the disk capacitor 15 on the horizontal plane is located between the first outer circle contour 1021a and the first inner circle contour 1021b (excluding the first outer circle contour 1021a and the first inner circle contour 1021b), and the orthographic projection of the outer end surface 153 on the horizontal plane is located between the second outer circle contour 1022a and the second inner circle contour 1022b (excluding the second outer circle contour 1022a and the second inner circle contour 1022b), so that when the scraper 30 scrapes the electrode slurry in the horizontal direction, part of the slurry will penetrate into the edge position of the first surface 151 of the disk capacitor 15 near the inner end surface 154 and the outer end surface 153. In this way, after the end-burning treatment, the edge position of the first surface 151 of the disk capacitor 15 near the inner end surface 154 is formed as follows: Figure 7 The circular flange 1540a of the inner electrode 1540 is shown, and the circular flange 1530a of the outer electrode 1530 is also formed at the edge position close to the outer end surface 153, so that the inner electrode 1540 and the outer electrode 1530 can be better covered on the inner end surface 154 and the outer end surface 153 of the disc capacitor 15, thereby preventing the inner electrode 1502 from being exposed.

[0054] like Figure 8 As shown, in some embodiments, the slurry structure 102 protrudes from the base surface where the end plate 100 contacts the disc capacitor 15, and the first slurry member 1021 and the second slurry member 1022 are both cylindrical. The outer diameter of the first slurry member 1021 is slightly smaller than the aperture of the central inner hole 155 of the disc capacitor 15, and its height is equal to or slightly smaller than the depth of the central inner hole 155. The inner diameter of the second slurry member 1022 is equal to or slightly larger than the outer diameter of the disc capacitor 15, and its height is equal to or slightly smaller than the thickness of the disc capacitor 15.

[0055] Before use, the end-sealing tool 10 is first covered on the first surface 151 of the disk capacitor 15 to be sealed, so that the slurry column 300 of the end-sealing tool 10 extends into the central inner hole 155 of the disk capacitor 15, and the slurry ring 302 is surrounded on the outer peripheral side of the outer end surface 153 of the disk capacitor 15. In this way, by covering the disk capacitor 15 with the raised slurry structure 102, the electrode slurry can be evenly coated on the inner end surface 154 and the outer end surface 153 of the disk capacitor 15, and the electrode slurry that flows on the end surface is reduced to gather at the lower part of the inner end surface 154 and the outer end surface 135 to form droplets. In this embodiment, the material of the slurry structure 102 is preferably latex. In addition to better controlling the amount of slurry, the pores inside the latex are evenly distributed, and the thickness of the electrode slurry covering the inner end surface 154 and the outer end surface 153 can be uniform.

[0056] Furthermore, in order to ensure that the inner end surface 154 and / or the outer end surface 153 of the disc capacitor 15 are completely covered by the electrode slurry, the above-mentioned end-sealing method further includes the following steps:

[0057] S3: Apply electrode slurry to the second surface 152 of the disc capacitor 15 parallel to the first surface 151, allow the electrode slurry to flow to the inner end surface 154 and the outer end surface 153, and then cure the electrode slurry so that the formed inner end electrode 1540 completely covers the inner end surface 154, and / or the formed outer end electrode 1530 completely covers the outer end surface 153.

[0058] Specifically, before applying the electrode slurry to the second surface 152 of the disc capacitor 15, first cover the top surface of the fixing tool 20 and the first surface 151 of the disc capacitor 15 in the accommodating hole 202 with the second adhesive tape to fix the relative position of the disc capacitor 15 with respect to the fixing tool 20, wherein the adhesive force of the second adhesive tape is greater than the adhesive force of the first adhesive tape, and then turn the fixing tool 20 upside down so that the second surface 152 of the disc capacitor 15 faces upward, and then remove the first adhesive tape adhered to the first surface 151 of the disc capacitor 15 to expose the second surface 152 of the disc capacitor 15, and then apply the electrode slurry to the second surface 152 of the disc capacitor 15 by screen printing, so that the electrode slurry flows on the inner end surface 154 and the outer end surface 153 of the disc capacitor 15 again. In this way, two printings are performed to ensure that the inner end surface 154 and the outer end surface 153 of the disc capacitor 15 can be completely covered by the electrode paste, thereby ensuring that the inner end electrode 1540 formed on the inner end surface 154 and / or the outer end electrode 1530 formed on the outer end surface 153 can connect all the inner electrodes 1502.

[0059] Compared with the prior art, based on the annular structure of the disk capacitor, the end-sealing method of the present invention uses screen printing to coat the first surface and / or the second surface of the disk capacitor parallel to the horizontal plane with electrode slurry, and then scrapes the electrode slurry in the horizontal direction, converting the electrode slurry coated in the horizontal direction into a flow on the inner end face and / or the outer end face perpendicular to the horizontal direction, so that the electrode slurry can cover the inner end face and / or the outer end face of the disk capacitor, and then the electrode slurry is burned and cured to form an inner end electrode layer on the inner end face and / or an outer end electrode on the outer end face; further, by providing an end-sealing tool, which is used as a coating template for the electrode slurry, the above-mentioned conversion of the coating in the horizontal direction into a flow in the vertical direction is achieved, thereby overcoming the defects of the above two methods of sealing the inner end face of the disk capacitor. The inner end electrode and the outer end electrode formed by the end-sealing method of the present invention have good adhesion effect, and at the same time, it can ensure that the formed inner end electrode can connect all the inner electrodes inside the disk capacitor, and batch disk capacitors can be sealed, effectively improving production efficiency.

[0060] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the embodiments of the present application. The singular forms of "a", "said" and "the" used in the embodiments of the present application and the claims are also intended to include plural forms, unless the context clearly indicates other meanings. It should also be understood that, unless otherwise specified, "multiple" refers to two or more; the terms "first", "second", "third", etc. are only used to distinguish, rather than to describe a specific order or sequence, and cannot be understood as indicating or implying relative importance. The term "and / or" used herein refers to and includes any or all possible combinations of one or more associated listed items. When the above description relates to the drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. In the description of the present application, for those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0061] The above-mentioned embodiments only express several implementation methods of the present invention, and the description is relatively specific and detailed, but it cannot be understood as limiting the scope of the invention patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention.

Claims

1. A method for sealing a disc capacitor, characterized in that: The following steps are involved: S1: Fixing the disc capacitor (15) to be sealed so that the central axis of the disc capacitor (15) is perpendicular to a horizontal plane; S2: Applying a fluid electrode slurry to the first surface (151) of the disc capacitor (15) parallel to the horizontal plane, allowing the electrode slurry to flow to the inner end surface (154) perpendicular to the first surface (151), and then curing the electrode slurry covering the inner end surface (154) to form an inner end electrode (1540).

2. The method for sealing a disc capacitor according to claim 1, characterized in that: In step S2, the electrode slurry is made to flow to an outer end surface (153) perpendicular to the first surface (151), and then the electrode slurry covering the outer end surface (153) is solidified to form an outer end electrode (1530).

3. The method for sealing a disc capacitor according to claim 2, characterized in that: The following steps are also included: S3: Applying the electrode slurry to the second surface (152) of the disc capacitor (15) parallel to the first surface (151), allowing the electrode slurry to flow to the inner end surface (154) and / or the outer end surface (153), and then curing the electrode slurry so that the formed inner end electrode (1540) completely covers the inner end surface (154), and / or the formed outer end electrode (1530) completely covers the outer end surface (153).

4. The method for sealing a disc capacitor according to claim 3, characterized in that: In step S2 and step S3, the electrode slurry is coated on the first surface (151) and the second surface (152) of the disc capacitor by screen printing. The screen printing method is as follows: a coating template is covered on the first surface (151) or the second surface (152), the electrode slurry is coated on the top surface of the coating template, and the electrode slurry is scraped in a horizontal direction by a scraper (30) so that the electrode slurry seeps out from the bottom surface of the coating template and flows to the inner end surface (154) and the outer end surface (153) of the disc capacitor (15).

5. The method for sealing a disc capacitor according to claim 4, characterized in that: The viscosity of the electrode slurry is 2-4 kcps.

6. A sealing tool for a disc capacitor, used for covering a first surface (151) or a second surface (152) of the disc capacitor (15) to serve as a coating template for electrode slurry, wherein: The first surface (151) and the second surface (152) are parallel to a horizontal plane, and are characterized in that: the end-sealing plate body (100) is provided with a grouting structure (102) penetrating the top surface and the ground surface thereof; The material of the slurry infiltration structure (102) is a material with pores inside to allow the electrode slurry to infiltrate and infiltrate; The slurry infiltration structure (102) comprises a first slurry infiltration member (1021); when the end-sealing tool (10) covers the first surface (151) or the second surface (152) of the disc capacitor (15), the orthographic projection of the first slurry infiltration member (1021) on the horizontal plane completely covers the orthographic projection of the inner end surface (154) of the disc capacitor (15) perpendicular to the first surface (151) on the horizontal plane, so that the electrode slurry infiltrating from the slurry infiltration structure (102) can flow to the inner end surface (154).

7. The end-sealing tool for disc capacitors according to claim 6, characterized in that: The first slurry-permeable member (1021) is in the shape of a ring. When the end-sealing tool (10) covers the first surface (151) or the second surface (152), the orthographic projection of the first slurry-permeable member (1021) on a horizontal plane has a first outer ring contour (1021a) and a first inner ring contour (1021b). The orthographic projection of the inner end surface (154) of the disc capacitor (15) on a horizontal plane is located between the first outer ring contour (1021a) and the first inner ring contour (1021b).

8. The end-sealing tool for disc capacitors according to claim 7, characterized in that: The slurry infiltration structure (102) further comprises a second slurry infiltration member (1022), which is arranged on the outer peripheral side of the first slurry infiltration member (1021). When the end-sealing tool (10) covers the first surface (151) or the second surface (152), the orthographic projection of the second slurry infiltration member (1022) on the horizontal plane completely covers the orthographic projection of the outer end surface (153) of the disc capacitor (15) perpendicular to the first surface (151) on the horizontal plane, so that the electrode slurry infiltrating from the slurry infiltration structure (102) can flow to the outer end surface (153).

9. The end-sealing tool for disc capacitors according to claim 8, characterized in that: The second slurry permeating member (1022) is in the shape of a ring. The orthographic projection of the second slurry permeating member (1022) on a horizontal plane has a second outer ring contour (1022a) and a second inner ring contour (1022b). The orthographic projection of the outer end surface (153) of the disc capacitor (15) on the horizontal plane is located between the second outer ring contour (1022a) and the second inner ring contour (1022b).

10. The end-sealing tool for disc capacitors according to claim 7, characterized in that: The material of the slurry infiltration structure (102) is any one of latex, silica gel and rubber.

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