Aluminum electrolytic capacitor packaging and marking method suitable for immersed liquid cooling technology

Abstract

The invention discloses an aluminum electrolytic capacitor packaging and marking method suitable for an immersed liquid cooling technology, and the method employs a packaging rubber plug whose outer surface is covered with a shielding layer with high solvent resistance, and an aluminum housing for combined packaging, and marks capacitance information at the top of the aluminum housing in a laser engraving manner. By adopting the packaging and marking method of the technology, the aluminum electrolytic capacitor can be soaked in the phase change liquid cooling liquid and the single-phase liquid cooling liquid to work for a long time, so that the aluminum electrolytic capacitor assembly or structure is prevented from separating out substances to enter a refrigerant to cause pollution, and the refrigerant is prevented from permeating into the aluminum electrolytic capacitor to cause capacitor damage.

Description

Technical Field

[0001] The invention belongs to the technical field of aluminum electrolytic capacitors, and in particular relates to an aluminum electrolytic capacitor packaging and marking method adapted to immersion liquid cooling technology. Background Art

[0002] Liquid cooling technology refers to a cooling technology that uses liquid heat exchange to remove heat from electronic equipment. The massive data throughput and computing have caused data centers, which are the "brains" of emerging technologies such as artificial intelligence and big data, to face unprecedented energy consumption and heat dissipation challenges. From the perspective of the physical form of the server, liquid cooling technology includes cold plate liquid cooling and full immersion liquid cooling, and the latter has a much better cooling effect than the former. Summary of the invention

[0003] Aluminum electrolytic capacitors are commonly used electronic components on server motherboards, power supplies and peripheral accessories. They need to be completely immersed in the refrigerant in immersion liquid cooling technology. Since the refrigerant itself has organic solvent properties, the sealing rubber plugs, insulating films, and logo printing inks exposed on the outer surface of the aluminum electrolytic capacitors may be affected, and material exchange may occur between them and the refrigerant, causing systemic damage. How to ensure that components remain compatible with the refrigerant during the life guarantee period of the terminal equipment is an important technical issue that restricts the promotion and application of liquid cooling technology.

[0004] (1) Technical issues to be solved

[0005] The purpose of the present invention is to provide an aluminum electrolytic capacitor packaging and marking method adapted to immersion liquid cooling technology, which can completely prevent the interaction between organic materials and refrigerant on the surface of the aluminum capacitor packaging shell, effectively block the sealing plug and the refrigerant, and improve the reliability of the aluminum electrolytic capacitor working in the refrigerant for a long time.

[0006] (2) Technical solution

[0007] In order to solve the above technical problems, the present invention provides a method for packaging and marking aluminum electrolytic capacitors adapted to immersion liquid cooling technology, the method comprising the following steps:

[0008] ① The first step of preparing a working core having capacitor performance;

[0009] ② Insert a sealing rubber plug into the core guide pin and place it in a special aluminum shell to perform waist shaping and edge shaping on the aluminum shell in the second process;

[0010] ③The third step is to engrave product-related information on the top of the aluminum case of the aluminum electrolytic capacitor after the surface is cleaned.

[0011] In the step ②, the material of the sealing rubber plug surface shielding the refrigerant is preferably polyimide or polyetherketone, more preferably perfluoropolypropylene or polyetheretherketone, and particularly preferably polytetrafluoroethylene or polyetheretherketoneketone.

[0012] In the step ②, the surface of the special aluminum shell is covered with a layer of highly solvent-resistant insulating material, and the insulating layer material is preferably polyimide, polyetherketone, polyetheretherketoneketone, more preferably perfluoropolypropylene, polytetrafluoroethylene, and particularly preferably aluminum oxide formed by anodizing the surface of the aluminum shell.

[0013] In the step ③, the capacitor information is marked by laser engraving.

[0014] (3) Beneficial effects

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] The aluminum electrolytic capacitor packaging and marking method adapted to the immersion liquid cooling technology of the present invention has no ink, sleeve or other organic materials on the outer surface of the packaged aluminum shell that are prone to swelling, dissolution and property change in the refrigerant, thereby completely eliminating the influence of the refrigerant on the surface of the capacitor shell;

[0017] The aluminum electrolytic capacitor packaging and marking method adapted to immersion liquid cooling technology of the present invention still relies on the packaging rubber plug for air tightness and water tightness of the packaging. The high solvent-resistant shielding layer covering the outer surface of the packaging rubber plug can greatly reduce the contact probability between the refrigerant and the packaging rubber, and effectively prolong the stable working time of the packaging rubber plug in the refrigerant. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the specific implementation of the present invention or the technical solution in the prior art, the drawings required for describing the specific implementation or the prior art are briefly introduced below. Obviously, the drawings described below are only one implementation of the present invention. For ordinary technicians in this field, other similar drawings can be obtained based on these drawings without paying creative work.

[0020] Figure 1 This is a three-dimensional diagram of an aluminum electrolytic capacitor packaging and marking method adapted to immersion liquid cooling technology according to the present invention (the rubber plug surface is visible).

[0021] Figure 2 This is a three-dimensional diagram of an aluminum electrolytic capacitor packaging and marking method adapted to immersion liquid cooling technology according to the present invention (the marking surface is visible).

[0022] Figure 3 The present invention is a cross-sectional view of a packaging structure of an aluminum electrolytic capacitor packaging and marking method adapted to immersion liquid cooling technology.

[0023] Figure 4 This is a cross-sectional view of the traditional aluminum electrolytic capacitor packaging structure.

[0024] The markings in the attached drawings are: 1-aluminum electrolytic capacitor working core package, 2-capacitor core package guide pin, 3-sealing rubber plug, 3a-sealing rubber plug rubber part, 3b-sealing rubber plug shielding layer, 4a-aluminum shell metal part, 4b-aluminum shell insulation layer, 5-engraved logo. DETAILED DESCRIPTION

[0026] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the technical scheme in the specific implementation mode of the present invention is clearly and completely described below to further illustrate the present invention. Obviously, the specific implementation mode described is only a part of the implementation mode of the present invention, rather than all styles.

[0027] Example 1

[0028] This specific implementation is a packaging and marking method for aluminum electrolytic capacitors adapted to immersion liquid cooling technology. The basic model is a solid aluminum electrolytic capacitor Φ8mm×8mm (16V270μF). The specific steps are as follows:

[0029] (1) Aluminum foil, electrolytic paper, and guide needles are wound into a capacitor core, and a conductive polymer formula solution or aqueous dispersion is formed by electrochemical repair and impregnation, and a core having capacitor performance is formed after high temperature treatment 1;

[0030] (2) Assembling a sealing rubber plug 3 made of butyl rubber on the core guide pin 2, wherein the shielding layer 3b of the sealing rubber plug is polytetrafluoroethylene. There is no particular restriction on the assembly order of the sealing rubber plug 3, and the sealing rubber plug 3 can be assembled just after winding is completed or after the conductive polymer is formed;

[0031] (3) The core of the assembled sealing rubber plug 3 is placed in an aluminum shell 4 whose insulating layer 4b is polytetrafluoroethylene, and the aluminum shell is subjected to waist shaping and edge shaping to press the rubber plug to form a sealing structure;

[0032] (4) After the packaged capacitor is cleaned, the product specifications and manufacturing information are engraved on the top surface of the aluminum shell using a laser5.

[0033] Example 2

[0034] The difference from Example 1 is that the sealing rubber plug shielding layer 3b is made of polyimide, and the rest of the operation and packaging are the same.

[0035] Example 3

[0036] The difference from Example 1 is that the sealing rubber plug 3a is made of EPDM rubber, and the rest of the operation and packaging are the same.

[0037] Example 4

[0038] The difference from Example 1 is that the insulating layer 4b of the aluminum shell is aluminum oxide produced by anodization, and the rest of the operations and packaging are the same.

[0039] Comparative Example 1

[0040] The difference from Example 1 is that the sealing rubber plug 3a is made of conventional resin vulcanized butyl rubber product without a shielding layer, and the rest of the operation and packaging are the same.

[0041] Comparative Example 2

[0042] The difference from Example 1 is that the sealing rubber plug 3a is made of a conventional EPDM rubber product without a shielding layer, and the rest of the operation and packaging are the same.

[0043] Comparative Example 3

[0044] The difference from Example 1 is that laser engraving is not used, and the capacitor information is marked by traditional UV ink pad printing, and the other operations are the same.

[0045] Comparative Example 4

[0046] The difference from Example 1 is that the aluminum shell insulating layer 4b is coated with conventional polyurethane, and the other operations are the same.

[0047] Comparative Example 5

[0048] The difference from Example 1 is that the aluminum shell insulation layer 4b is coated with conventional nylon, and the other operations are the same.

[0049] In order to verify the advantages of the aluminum electrolytic capacitors manufactured by the packaging and marking method of the present invention, the capacitors manufactured by the above embodiments and corresponding comparative examples were immersed in 3M™ Fluorinert™ FC-770 refrigerant (phase change liquid cooling) and ExxonMobil™ Data Center Immersion Fluid 3220 refrigerant (single-phase liquid cooling) for compatibility testing. The test conditions were 85°C sealed immersion for 1000 hours, and the number of tests was 10. The specific test results are shown in the following table:

[0050] Table 1 Test results of various embodiments and comparative examples

[0051]

[0052] Table 1 (Continued) Test results of various embodiments and comparative examples

[0053]

[0054] As can be seen from Table 1, compared with the capacitors prepared in Comparative Examples 1 and 2, the embodiments of the packaging and marking method of the present invention add a shielding layer 3b to the sealing rubber plug 3a, isolating the influence of the refrigerant on the sealing rubber plug, and the capacitors prepared have good compatibility in the refrigerant. The capacitor prepared in Comparative Example 1 has good compatibility in phase change liquid cooling refrigerant, but poor compatibility in single-phase liquid cooling refrigerant. The capacitor prepared in Comparative Example 2 is incompatible in both refrigerants.

[0055] Compared with the capacitors prepared in comparative example 3, the capacitor identification information of each embodiment of the packaging and marking method of the present invention adopts an ink-free laser engraving scheme, which completely eliminates the interaction between ink and refrigerant, and can still maintain clear recognition after long-term immersion in refrigerant. The capacitor prepared in comparative example 3 has good compatibility in phase change liquid cooling refrigerant, but poor compatibility in single-phase liquid cooling refrigerant.

[0056] Compared with the capacitors prepared in Comparative Examples 4 and 5, the aluminum shell insulation layer 4b of the embodiments of the packaging and marking method of the present invention uses polytetrafluoroethylene and aluminum oxide with stronger solvent resistance, and has good insulation retention after long-term immersion in the refrigerant. The surface insulation layer 4b of the aluminum shell of the capacitor prepared in Comparative Examples 4 and 5 is relatively well maintained in the phase-change liquid cooling refrigerant, and swells and falls off in the single-phase liquid cooling refrigerant.

[0057] Table 2 Test results of various embodiments and comparative examples

[0058]

[0059] Table 2 (Continued) Test results of various embodiments and comparative examples

[0060]

[0061] As shown in Table 2, compared with the capacitors prepared in Comparative Examples 1 and 2, the embodiments of the packaging and marking method of the present invention add a shielding layer 3b to the sealing rubber plug 3a, isolating the influence of the refrigerant on the sealing rubber plug, and the sealing performance of the rubber plug is maintained. The sealing rubber plug made of butyl rubber material in Comparative Example 1 has no shielding layer and can maintain airtightness in phase change liquid cooling refrigerant, but swells and loses airtightness in single-phase liquid cooling refrigerant.

[0062] In summary, by adopting a packaging and marking method including a sealing rubber plug shielding layer 3b, a highly solvent-resistant aluminum shell insulating layer 4b and laser engraving, it is possible to manufacture an aluminum electrolytic capacitor adapted to immersion liquid cooling technology, and its compatibility in phase change liquid cooling refrigerant and single-phase liquid cooling refrigerant is much higher than that of aluminum electrolytic capacitors on the market at home and abroad.

[0063] The above describes the specific embodiments of the present invention. It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary specific embodiments, and the present invention can be implemented in other specific forms without departing from the concept or basic characteristics of the present invention. Therefore, no matter from which point of view, the above specific embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the attached claims rather than the above description, and it is intended that all changes that fall within the meaning and scope of the equivalent elements of the claims are included in the present invention.

[0064] In addition, it should be understood that although the present specification is described according to various implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each implementation method may also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A method for packaging and marking aluminum electrolytic capacitors adapted to immersion liquid cooling technology, characterized in that The following steps are involved: (1) The first step of preparing a working core having capacitor performance; (2) Inserting a sealing rubber plug into the core guide pin and placing it into a special aluminum shell to perform waist shaping and edge shaping on the aluminum shell; (3) The third step is to engrave product-related information on the top of the aluminum case of the aluminum electrolytic capacitor after the surface has been cleaned.

2. The method for packaging and marking aluminum electrolytic capacitors adapted to immersion liquid cooling technology according to claim 1, characterized in that: In the step (2), the outer surface of the sealing rubber plug comprises a refrigerant isolation layer, the components of which include but are not limited to highly solvent-resistant materials such as fluoropolymers, polyimide, and polyether ketone.

3. The method for packaging and marking aluminum electrolytic capacitors adapted to immersion liquid cooling technology according to claim 1, characterized in that: In the step (2), the surface of the special aluminum shell is covered with a layer of highly solvent-resistant insulating material, the components of which include but are not limited to high molecular polymers such as fluorine-containing polymers, polyimide, polyether ketone, and metal oxides formed by anodization.

4. The method for packaging and marking aluminum electrolytic capacitors adapted to immersion liquid cooling technology according to claim 1, characterized in that: In the step (3), the capacitor information marking method adopts an ink-free laser engraving method.

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