Filling and sealing tool, assembling equipment and capacitor

Abstract

The utility model discloses a potting tool, assembling equipment and capacitor, relates to capacitor element technical field, the potting tool comprises an elastic base plate and a reinforcing plate, the elastic base plate possesses a first side and a second side which are oppositely arranged in its thickness direction, the first side of the elastic base plate is used for covering the opening end of the housing, and the second side of the elastic base plate is used for covering the opening end of the housing. The housing and the housing form a cavity in an enclosing manner; the hardness of the reinforcing plate is set to be larger than that of the elastic bottom plate, the reinforcing plate is arranged on the second side of the elastic bottom plate or inside the elastic bottom plate, the first side of the elastic bottom plate covers the opening end of the capacitor shell, after the first side of the elastic bottom plate and the shell form a cavity in an enclosing mode, the cavity is filled with high-temperature liquid pouring sealant, and after the pouring sealant is solidified, the first side of the elastic bottom plate and the shell form the cavity in an enclosing mode. The elastic bottom plate can be stripped from the shell of the capacitor, and the potting tool is removed, so that the thickness of the capacitor product can be reduced, and the material cost of the bottom cover is saved at the same time.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of capacitor element, especially relates to a pouring and sealing tool, assembling equipment and capacitor. BACKGROUND

[0002] In the existing bus capacitor manufacturing technology, a pouring and sealing method containing a shell is generally adopted. The shell is generally made of plastic or metal, and the main purpose is to provide a fixed molding space when the epoxy resin is in the liquid phase, to ensure that it can be smoothly solidified. However, once the epoxy resin completes the solidification process, it itself can play a role in protecting and supporting the internal components, at which time the function of the shell is redundant. In addition, the additional shell increases the overall volume of the product, not only making the bus capacitor module occupy more space, but also bringing the rise of material cost. Therefore, from the design and economic point of view, the existence of the shell not only does not make full use of resources, but also limits the miniaturization development of the product. SUMMARY

[0003] The main purpose of the utility model is to provide a pouring and sealing tool, assembling equipment and capacitor, which can save the material cost of the capacitor module and reduce the volume of the capacitor.

[0004] To achieve the above-mentioned purpose, the pouring and sealing tool provided by the utility model comprises:

[0005] The elastic bottom plate has a first side and a second side arranged oppositely in the thickness direction, the first side of the elastic bottom plate is used to cover the open end of the shell, and the cavity is formed by surrounding the shell; and

[0006] The reinforcing plate is arranged on the second side or inside of the elastic bottom plate.

[0007] In an embodiment, a plurality of reinforcing plates are arranged.

[0008] In an embodiment, the plurality of reinforcing plates are arranged along the length direction of the elastic bottom plate.

[0009] In an embodiment, the gap between two adjacent reinforcing plates is greater than or equal to 2 mm and less than or equal to 10 mm.

[0010] In an embodiment, the thickness of the reinforcing plate is greater than or equal to 0.2 mm.

[0011] In an embodiment, the elastic bottom plate is a silica gel plate or a rubber plate; and / or

[0012] The reinforcing plate is a metal plate.

[0013] In one embodiment, the reinforcing plate is disposed on the second side of the elastic base plate, and the elastic base plate is bonded to the reinforcing plate.

[0014] In one embodiment, a bridging coating is provided on the second side of the elastic base plate, and the elastic base plate is bonded to the reinforcing plate through the bridging coating.

[0015] This utility model also proposes an assembly device, including a filling fixture, wherein the filling fixture includes:

[0016] An elastic base plate has a first side and a second side disposed opposite to each other in its thickness direction. The first side of the elastic base plate is used to cover the open end of the housing, thereby enclosing a cavity with the housing; and...

[0017] A reinforcing plate, wherein the hardness of the reinforcing plate is set to be greater than that of the elastic base plate, and the reinforcing plate is disposed on the second side or inside the elastic base plate.

[0018] This utility model also proposes a capacitor for manufacture by a filling fixture, the capacitor comprising:

[0019] The housing has a receiving cavity with an opening at one end, the opening end of the housing being used to mate with the first side of the elastic base plate;

[0020] A capacitor element assembly is disposed in the receiving cavity; and,

[0021] Encapsulating resin is used to fill the cavity.

[0022] The potting fixture includes:

[0023] An elastic base plate has a first side and a second side disposed opposite to each other in its thickness direction. The first side of the elastic base plate is used to cover the open end of the housing, thereby enclosing a cavity with the housing; and...

[0024] A reinforcing plate, wherein the hardness of the reinforcing plate is set to be greater than that of the elastic base plate, and the reinforcing plate is disposed on the second side or inside the elastic base plate.

[0025] In the technical solution of this utility model, the first side of the elastic base plate is covered with the opening end of the capacitor shell to form a cavity. After the cavity is filled with high-temperature liquid potting compound, the first side of the elastic base plate can deform during the cooling and curing process of the potting compound. When the cavity is vacuumed, the first side of the elastic base plate can deform and fit with the periphery of the opening of the shell to ensure a seal. The reinforcing plate can provide support for the elastic base plate and prevent the elastic base plate from deforming and bulging during vacuuming. After the potting compound cures, the elastic base plate can be peeled off from the capacitor shell and the potting fixture can be removed, which reduces the thickness of the capacitor product and saves material costs for the bottom cover. Attached Figure Description

[0026] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the structure of a capacitor in related technologies;

[0028] Figure 2 A top view schematic diagram of an embodiment of the potting fixture provided by this utility model;

[0029] Figure 3 for Figure 2 Side view of the filling and sealing tool.

[0030] Explanation of icon numbers:

[0031] 100. Potting fixture; 1. Elastic base plate; 11. First side; 12. Second side; 2. Reinforcing plate;

[0032] 200. A capacitor in the related art; 10. The casing of a capacitor in the related art; 20. The bottom cover of a capacitor in the related art.

[0033] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0034] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0035] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly.

[0036] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0037] Please see Figure 1 In existing bus capacitor manufacturing technology, a potting method incorporating a casing is commonly used. This casing, typically made of plastic or metal, primarily aims to provide a fixed molding space while the epoxy resin is in its liquid state, ensuring successful curing. However, once the epoxy resin has completed its curing process, it itself provides protection and support for the internal components, rendering the casing redundant. Furthermore, the additional casing increases the overall product volume, resulting in the bus capacitor module occupying more space and raising material costs. Therefore, from a design and economic perspective, the presence of the casing neither fully utilizes resources nor facilitates product miniaturization.

[0038] To address the aforementioned issues, this invention proposes a potting fixture that aims to reduce capacitor volume while saving on capacitor module material costs.

[0039] Please see Figure 2 and Figure 3 In one embodiment of the present invention, the potting fixture 100 includes an elastic base plate 1 and a reinforcing plate 2. The elastic base plate 1 has a first side 11 and a second side 12 that are arranged opposite to each other in its thickness direction. The first side 11 of the elastic base plate 1 is used to cover the opening end of the housing 10 and to form a cavity with the housing 10. The hardness of the reinforcing plate 2 is set to be greater than that of the elastic base plate 1. The reinforcing plate 2 is disposed on the second side 12 of the elastic base plate 1 or inside it.

[0040] It is understandable that the elastic base plate 1 can cover the opening end of the housing 10, that is, the size of the elastic base plate 1 is larger than the opening size of the housing 10. In this way, when the elastic base plate 1 and the housing 10 are used to form a cavity and fill it with potting compound, the elastic base plate 1 can act as the bottom cover 20 of the housing 10, so that the cavity can form a sealed space. In order to ensure the sealing of the cavity, the material of the elastic base plate 1 can be set as a rubber plate, silicone plate or composite PU plastic plate, etc.

[0041] As can be understood, hardness refers to a material's ability to resist external forces from penetrating its surface. The hardness of reinforcing plate 2 is set to be greater than that of elastic base plate 1. The higher hardness of reinforcing plate 2 allows it to better resist external forces and maintain shape stability. Reinforcing plate 2 is used to provide structural support and protection. The material of reinforcing plate 2 can be a metal plate (such as stainless steel or aluminum alloy), a high-strength plastic plate (such as ABS or PC), etc.

[0042] The reinforcing plate 2 can be placed on the second side 12 of the elastic base plate 1, or even embedded inside the elastic base plate 1, which can provide certain support for the elastic base plate 1 and prevent the elastic base plate 1 from deforming.

[0043] When using the potting fixture 100 for potting, the capacitor component assembly can be placed inside the housing 10 from the open end of the housing 10. Then, the first side 11 of the elastic base plate 1 is placed over the open end of the housing 10, and the high-temperature liquid potting compound is injected into the cavity of the housing 10 from the potting hole of the housing 10.

[0044] During the potting process, the epoxy resin may trap air upon contact with it, forming bubbles. These bubbles, once cured, become defects in the insulation layer, reducing the electrical performance and reliability of the capacitor. To ensure a tight bond between the potting compound and the capacitor element, to allow the epoxy resin to more evenly coat the capacitor element, and to reduce the risk of stress concentration, vacuuming can effectively remove these bubbles and guarantee potting quality.

[0045] Therefore, during vacuuming, a negative pressure is formed in the cavity. The elastic base plate 1 has low hardness and is prone to deformation, which can easily cause a depression in the cavity, affecting the final appearance and quality of the capacitor. The reinforcing plate 2 is set on the second side 12 or inside the elastic base plate 1 to provide support for the elastic base plate 1 and will not deform.

[0046] After the potting compound has fully cured, the potting fixture 100 can be removed from the opening of the housing 10, and the potting compound at the opening of the housing 10 forms the outer surface. The potting fixture 100 can be reused when potting other capacitors in the future. Therefore, compared with the capacitor 200 of the related technology, it saves on capacitor material costs and reduces the assembly process of the bottom cover 20.

[0047] In the technical solution of this utility model, the first side 11 of the elastic base plate 1 covers the opening end of the capacitor housing 10, and after forming a cavity with the housing 10, the cavity is filled with high-temperature liquid potting compound. During the cooling and curing process of the potting compound, when the cavity is vacuumed, the first side 11 of the elastic base plate 1 can deform and fit with the periphery of the opening of the housing 10 to ensure a seal. The reinforcing plate 2 can provide support for the elastic base plate 1 and prevent the elastic base plate 1 from deforming and bulging upwards during vacuuming. After the potting compound cures, the elastic base plate 1 can be peeled off from the capacitor housing 10 and the potting fixture 100 can be removed, so that the thickness of the capacitor product can be reduced, and the material cost of the bottom cover 20 can be saved.

[0048] Furthermore, in this embodiment, multiple reinforcing plates 2 are provided, and the multiple reinforcing plates 2 are arranged at intervals.

[0049] It should be noted that the potting compound may undergo a slight chemical reaction with the surface of the silicone sheet during the curing process, leading to adhesion. Furthermore, the potting compound in its liquid state may penetrate into the tiny pores of the silicone sheet, forming a physical adsorption after curing. Therefore, when removing the potting fixture 100, it is necessary to overcome the adhesive force between the elastic base plate 1 and the potting compound.

[0050] If the reinforcing plate 2 is set to be a single surface, then a large amount of force is required to tear it off, making the operation difficult.

[0051] By setting multiple spaced reinforcing plates 2, the removal can be done piece by piece, reducing the force required for a single removal. The segmented removal is relatively simple to operate, and the force can be checked and adjusted step by step to reduce damage to the silicone plate.

[0052] It is understood that multiple reinforcing plates 2 are arranged at intervals. The shapes of the multiple reinforcing plates 2 can be the same or different. The interval between the multiple reinforcing plates 2 can be equidistant or unequal. The specific design can be based on the actual situation. This specification does not limit this aspect in the embodiments.

[0053] In one specific embodiment, a plurality of reinforcing plates 2 are arranged sequentially at intervals along the length direction of the elastic base plate 1.

[0054] Each reinforcing plate 2 extends along the width of the elastic base plate 1, and multiple reinforcing plates 2 are spaced apart along the length of the elastic base plate 1. Therefore, the length of each reinforcing plate 2 only needs to be approximately the same as the width of the elastic base plate 1. The area of ​​each reinforcing plate 2 is small, and the force required to remove each reinforcing plate 2 in a single operation is small. Furthermore, when lifting the potting fixture 100, it is only necessary to lift and peel it off sequentially along the length of the elastic base plate 1, reducing the difficulty of operation.

[0055] Specifically, in this embodiment, the gap between two adjacent reinforcing plates 2 is set to be greater than or equal to 2 mm and less than or equal to 10 mm. That is, it can be 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, or 10 mm. The specific gap can be designed according to the actual situation, and this embodiment does not limit it.

[0056] It should be noted that the gap between two adjacent reinforcing plates 2 is the distance between the sides of the two reinforcing plates 2 that are close to each other.

[0057] The gap between two adjacent reinforcing plates 2 is set between 2mm and 10mm, preferably between 5mm and 8mm. This allows the area corresponding to the elastic base plate 1 to provide a certain amount of deformation clearance when the area corresponding to the previous reinforcing plate 2 is lifted and peeled off, which facilitates the operation and removal of the area corresponding to the next reinforcing plate 2.

[0058] Furthermore, in this embodiment, the thickness of the reinforcing plate 2 is set to be greater than or equal to 0.2 mm. In this way, by ensuring the thickness of the reinforcing plate 2, the strength of the reinforcing plate 2 is guaranteed, and deformation due to insufficient thickness and strength is avoided.

[0059] Specifically, in this embodiment, the elastic base plate 1 is a silicone plate or a rubber plate; and / or, the reinforcing plate 2 is a metal plate.

[0060] When the elastic base plate 1 is a rubber plate, because rubber has high elasticity and good wear resistance, when it is matched with the open end of the housing 10, the rubber plate can form a good sealing structure and the cost is low.

[0061] Because of its excellent elasticity and temperature resistance, the silicone sheet can maintain its physical properties over a wide temperature range. Furthermore, the silicone sheet also exhibits good resistance to aging, chemical corrosion, and biocompatibility. Therefore, when mated with the open end of the housing 10, the silicone sheet can undergo a certain degree of deformation, forming a good seal with the housing 10. Simultaneously, as a component in direct contact with the high-temperature potting compound, it demonstrates good stability.

[0062] Preferably, the elastic base plate 1 is a silicone plate. Rubber is prone to aging and is easily volatilized and unstable at high temperatures. Compared with rubber, silicone is more stable and less prone to aging, which can extend the service life of the potting fixture 100.

[0063] Understandably, the metal plate possesses high hardness and strength, providing excellent support for the elastic base plate 1. Metal plate materials include stainless steel, aluminum alloy, and copper alloy.

[0064] Specifically, in this embodiment, the reinforcing plate 2 is disposed on the second side 12 of the elastic base plate 1, and the elastic base plate 1 is bonded to the reinforcing plate 2.

[0065] By using adhesives or other bonding methods, the elastic base plate 1 and the reinforcing plate 2 are fixed together to ensure a firm and reliable bond between them and prevent separation during use.

[0066] Furthermore, in some embodiments, a bridging coating is provided on the second side 12 of the elastic base plate 1, and the elastic base plate 1 is bonded to the reinforcing plate 2 through the bridging coating.

[0067] When the elastic base plate 1 is a silicone plate and the reinforcing plate 2 is a metal plate, the overly smooth surface of the silicone plate is not conducive to the penetration and adhesion of the adhesive, resulting in poor adhesion when it is bonded to the metal plate.

[0068] Thus, a bridging coating can be provided on the second side 12 of the elastic base plate 1, that is, a modified material can be coated on the surface of the elastic base plate 1 so that the second side 12 of the elastic base plate 1 can form a bridging coating that is conducive to a firm bond with the metal plate after modification.

[0069] Specifically, in some embodiments, a silane coupling agent can be coated on the second side 12 of the elastic base plate 1. The silane coupling agent is a compound containing two different reactive groups, one of which can react with the hydroxyl groups on the surface of silicone and the other of which can react with the oxides on the surface of metal, thereby forming a chemically bonded bridging coating.

[0070] In other embodiments, a titanate coupling agent may be coated on the second side 12 of the elastic base plate 1. The titanate coupling agent is a compound containing titanate groups that can react with the hydroxyl groups on the silicone surface and the oxides on the metal surface to form a stable bridging coating.

[0071] Of course, other possible bridging coatings can also be used, and the specific method can be determined according to the actual situation. This specification does not limit this aspect in the embodiments.

[0072] When assembling capacitors using the potting fixture 100, it can be done manually. Of course, in fully automated or semi-automated production, the assembly equipment can also be used to pot the capacitors using the potting fixture 100.

[0073] This utility model also proposes an assembly device, which includes a potting fixture 100. The specific structure of the potting fixture 100 is as described in the above embodiments. Since this assembly device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, and will not be described in detail here. The assembly device may also include a fixing mechanism and an operating mechanism. The fixing mechanism is used to fix the capacitor housing 10, and the operating mechanism is used to clamp the potting fixture 100. After potting is completed, the operating mechanism can automatically separate the potting fixture 100 from the capacitor without manual operation, thus improving operating efficiency.

[0074] This utility model also proposes a capacitor for use in a filling tool. The capacitor includes a housing 10, a capacitor element assembly, and a potting compound. The housing 10 has a receiving cavity with an opening at one end, and the opening end of the housing 10 is used to cooperate with the first side 11 of the elastic base plate 1. The capacitor element assembly is disposed in the receiving cavity. The potting compound is filled in the receiving cavity.

[0075] Thus, since the capacitor is made by potting fixture 100, the potting fixture 100 can be removed after the potting glue inside the capacitor has cured. The bottom of the capacitor is equivalent to reducing the bottom cover 20 in the related technology. Therefore, the material of one bottom cover is reduced, and the overall thickness of the capacitor is also reduced, so that the capacitor can be reduced in size and cost.

[0076] The above description is merely an exemplary embodiment of the present utility model and does not limit the patent scope of the present utility model. Any equivalent structural transformations made based on the technical concept of the present utility model and the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A potting jig, characterized by, The application relates to a potting tool, comprising: an elastic bottom plate having a first side and a second side oppositely arranged in a thickness direction, the first side of the elastic bottom plate being used to cover an open end of a shell to form a cavity with the shell; and a reinforcing plate, the reinforcing plate being arranged on the second side or inside of the elastic bottom plate, and the hardness of the reinforcing plate being greater than that of the elastic bottom plate. A plurality of reinforcing plates are arranged at intervals.

2. The potting tool according to claim 1, wherein The plurality of reinforcing plates are arranged at intervals along a length direction of the elastic bottom plate.

3. The potting tool according to claim 2, wherein The interval between two adjacent reinforcing plates is greater than or equal to 2 mm and less than or equal to 10 mm.

4. The potting tool of claim 3, wherein The thickness of the reinforcing plate is greater than or equal to 0.2 mm.

5. The potting fixture of claim 1, wherein The elastic bottom plate is a silica gel plate or a rubber plate; and / or 6. The potting fixture of claim 1, wherein The reinforcing plate is a metal plate. The reinforcing plate is arranged on the second side of the elastic bottom plate, and the elastic bottom plate is bonded to the reinforcing plate.

7. The potting fixture of claim 1, wherein The second side of the elastic bottom plate is provided with a bridging coating, and the elastic bottom plate is bonded to the reinforcing plate through the bridging coating.

8. The potting fixture of claim 7, wherein, The application further relates to a capacitor comprising the potting tool.

9. An assembly apparatus, characterized by The capacitor comprises:

10. A capacitor made by the potting tool according to any one of claims 1 to 8, characterized in that a shell having an accommodating cavity with an open end, the open end of the shell being used to cooperate with the first side of the elastic bottom plate; a capacitor element assembly arranged in the accommodating cavity; and potting glue filled in the accommodating cavity. ​

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