Metal packaging laminated solid aluminum electrolytic capacitor and preparation method thereof
Through the use of metal packaging structure and insulating sealant, the packaging problem of laminated solid aluminum electrolytic capacitors in high temperature and high humidity environments is solved, and higher airtightness and stability are achieved, and suitable for harsh environments.
Patent Information
- Application Number
- CN202510380261.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-28
- Publication Date
- 2025-07-25
AI Technical Summary
Existing stacked solid-state aluminum electrolytic capacitors are susceptible to intrusion of moisture or corrosive gases in high temperature and high humidity environments, resulting in deterioration or failure of performance, and the non-airtight structure of resin packaging cannot be effectively protected.
Using a metal packaging structure, an anode metal tube shell and cathode metal tube shell are used to form an airtight shell, and an insulating sealant and an annular coating layer are filled at the joint to ensure the airtightness of the packaging and avoid short circuits.
It improves the humidity and heat resistance of the capacitor, is suitable for harsh environments, ensures the product to operate stably under high temperature and high humidity, and avoids performance deterioration.
Smart Images
Figure CN120376342A_ABST
Abstract
Description
Technical Field
[0001] The present invention relates to the technical field of aluminum electrolytic capacitors, and particularly to a metal-packaged laminated solid aluminum electrolytic capacitor and a preparation method thereof. Background Art
[0002] The laminated solid aluminum electrolytic capacitor uses a polymer material with high conductivity as the solid electrolyte, adopts a core package structure in which multiple cores are stacked in parallel, and uses epoxy resin as the encapsulation material to protect the core package while shaping the finished product into a square structure suitable for surface mounting. Compared with traditional liquid aluminum electrolytic capacitors, the laminated solid aluminum electrolytic capacitor has the advantages of better basic electrical performance, smaller volume, longer service life, higher environmental protection and safety characteristics, and can better meet the development needs of miniaturization, lightness, thinness and high speed of the whole machine in the electronic information industry.
[0003] At present, the common process for preparing laminated solid aluminum electrolytic capacitors is as follows: The cut formed foil is divided into an anode area and a cathode area with a barrier adhesive, and a conductive polymer solid electrolyte layer, a conductive carbon paste layer and a silver paste layer are sequentially formed on the surface of the cathode area of the foil to form a core; The anode parts of multiple cores are welded together, and the cathode parts are bonded together with conductive silver glue, and stacked on the upper and lower surfaces of the peripheral lead frame to form a core package, completing the extraction of the anode and cathode. Then, using a mold, the core package is injection-molded with an epoxy resin encapsulation material, and the leads extend out of the resin shell from the middle of both ends of the core package and are bent secondarily towards the bottom along the resin shell to form external terminals. However, the resin encapsulation is a non-airtight structure, and it is easy to be invaded by moisture or corrosive gases and liquids inside the capacitor in harsh environments such as high temperature and high humidity, resulting in deterioration or even failure of product performance. Based on this, the present invention designs a metal-packaged laminated solid aluminum electrolytic capacitor and a preparation method thereof to solve the above problems. Summary of the Invention
[0004] The purpose of the present invention is to provide a metal-packaged laminated solid aluminum electrolytic capacitor and a preparation method thereof to solve the above technical problems.
[0005] To achieve the above purpose, the present invention provides the following first technical solution: A metal-packaged laminated solid aluminum electrolytic capacitor includes a core package, an anode metal tube shell, a cathode metal tube shell and an annular coating layer. Both the anode metal tube shell and the cathode metal tube shell are square open structures, and the two openings of the anode metal tube shell and the cathode metal tube shell are sleeved with each other and hermetically connected to form a shell. The ends of the anode metal tube shell and the cathode metal tube shell away from each other are the anode end and the cathode end respectively. The core package is installed inside the shell, and the anode area of the core package is electrically connected to the anode end, and the cathode area of the core package is electrically connected to the cathode end. The annular coating layer is arranged on the outer surface of the periphery of the shell.
[0006] Preferably, the annular coating layer is made of a polymer insulating material.
[0007] Preferably, the core package includes N cores and N+1 metal gaskets which are alternately stacked in sequence, the core includes an anode part, a cathode part and a barrier glue, the metal gasket is fixedly connected to the anode part of the core and electrically connected to form the anode area of the core package, and the cathode parts of each core are fixedly connected to each other and electrically connected to form the cathode area of the core package.
[0008] Preferably, the anode part of the core is fixedly connected to the metal gasket by welding, and the cathode parts of each core are fixedly connected to each other by conductive silver glue.
[0009] Preferably, the anode metal tube shell includes an anode tube body with an opening at one end, and the other end of the anode tube body is an anode end. The cathode metal tube shell includes a first cathode tube body and a second cathode tube body connected to each other, and the cross-section of the first cathode tube body is smaller than the cross-section of the second cathode tube body, the end of the first cathode tube body is provided with an opening, and the end of the second cathode tube body is the cathode end. When the anode metal tube shell and the cathode metal tube shell are fitted together, the first cathode tube body is inserted into the interior of the anode tube body, and the end of the anode tube body abuts against the end of the second cathode tube body.
[0010] Preferably, the outer surface and open edge of the anode tube body are covered with an insulating coating, and the outer surfaces of the first cathode tube body and the second cathode tube body, the open portion of the first cathode tube body, and the inner surface area of the first cathode tube body near the open edge are covered with an insulating coating.
[0011] Preferably, the outer surfaces of the anode end and the cathode end are provided with a tin layer.
[0012] Preferably, the capacitor also includes two symmetrically arranged pins, and the cross-sectional shape of the pins is "匚"-shaped, the two pins are respectively tightly attached to the outer surfaces of the anode end and the cathode end, and cover a partial area of the annular coating layer close to the anode end and the cathode end, the two pins are respectively electrically connected to the anode end and the cathode end, and the outer surfaces of the two pins are both provided with a tin layer.
[0013] The present invention provides the following second technical solution: A method for preparing a metal-packaged laminated solid aluminum electrolytic capacitor comprises the following steps: S1: punching the formed aluminum foil into a rectangle, coating it with a barrier adhesive to form an anode portion and a core cathode region, and then sequentially forming a conductive polymer layer, a conductive carbon paste layer, and a conductive silver paste layer on the surface of the core cathode region to prepare a cathode portion and obtain a core; S2, alternately arranging the anode parts of the N core pieces and the N+1 rectangular metal gaskets, and then achieving the fixed connection between the anode parts and the metal gaskets and the electrical connection between the anode parts by welding, and achieving the fixed connection and electrical connection between the cathode parts of the N core pieces by bonding and curing with conductive silver glue to obtain a core package; S3, bonding the cathode region of the core package to the cathode metal tube shell of the external device through conductive silver glue, so that the cathode region of the core package is electrically connected to the cathode metal tube shell, and the anode region of the core package is exposed from the open edge of the cathode metal tube shell, and the outer surface, the open edge and the inner surface area near the open edge of the cathode metal tube shell are covered with an insulating coating; S4, coating an insulating sealant on the outer surface of the first cathode tube body of the cathode metal tube shell, fitting an external anode metal tube shell that matches the cathode metal tube shell with the cathode metal tube shell to form an airtight connection, and filling a conductive silver glue between the anode area of the core package and the anode metal tube shell to form an electrical connection between the anode area of the core package and the anode metal tube shell, thereby obtaining a first capacitor semi-finished product, and the outer surface and the open edge surface of the anode metal tube shell are covered with an insulating coating; S5, wrapping an annular coating layer around the outer surface of the first capacitor semi-finished product, and leaving the anode end and the cathode end bare, to produce a second capacitor semi-finished product; S6. Remove the insulating coating on the surface of the anode end and the cathode end of the second capacitor semi-finished product, and then form a tin layer on the surface of the anode end and the cathode end to make a capacitor.
[0014] Preferably, step S6 can also be: removing the insulating coating on the surface of the anode end and the cathode end of the second capacitor semi-finished product, and then welding a "匚"-shaped pin on the surface of the anode end and the cathode end respectively, and the two pins are arranged opposite to each other and cover a partial area of the annular coating layer close to the anode end and the cathode end, and finally forming a tin layer on the outer surface of the pin to make a capacitor.
[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. The solid aluminum electrolytic capacitor of the present invention forms a capsule structure by encapsulating the prefabricated core package with a pair of open metal tube shells that cooperate with each other, and the ends of the tube shells are electrically connected to the anode and cathode parts of the core package respectively to lead out the anode and cathode to realize the function of external terminals. It has better airtightness than resin packaging, which is beneficial to improving the moisture and heat resistance of the product, and is more suitable for applications in harsh environments such as high temperature and high humidity. Combined with the coverage of the joint by the annular insulating coating layer, the airtight packaging is further ensured.
[0016] 2. During the preparation of the capacitor of the present invention, the airtightness of the package is ensured by setting an insulating sealant at the tube shell joint and setting an annular insulating coating layer outside the tube shell; an insulating coating is provided on the outer surface, the open edge and the inner surface near the open edge of the metal tube shell to prevent short circuits, so that the anode tube shell and the cathode tube shell are electrically non-conductive from each other. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.
[0018] Figure 1 is a schematic structural diagram of the solid aluminum electrolytic capacitor of the present invention; Figure 2 is a front sectional view of the solid aluminum electrolytic capacitor of the present invention; Figure 3 is a schematic structural diagram of the core package in the solid aluminum electrolytic capacitor of the present invention; Figure 4 is a schematic structural diagram of the anode metal tube shell in the solid aluminum electrolytic capacitor of the present invention; Figure 5 is a schematic structural diagram of the cathode metal tube shell in the solid aluminum electrolytic capacitor of the present invention; Figure 6 is a schematic structural diagram of the solid aluminum electrolytic capacitor of the present invention after adding pins Figure 7 is a flowchart of the preparation method of the solid aluminum electrolytic capacitor of the present invention.
[0019] In the drawings, the list of components represented by each reference numeral is as follows: 1. Core package; 11. Core; 111. Anode part; 112. Cathode part; 113. Barrier glue; 12. Metal gasket; 2. Anode metal tube shell; 21. Anode end; 22. Anode tube body; 3. Cathode metal tube shell; 31. Cathode end; 32. First cathode tube body; 33. Second cathode tube body; 4. Annular coating layer; 5. Pin. DETAILED DESCRIPTION OF THE EMBODIMENTS
[0020] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.
[0021] Please refer to Figure 1-7 , a technical solution provided by the present invention is specifically as follows: As Figure 1 and 2 shown, a metal-encapsulated laminated solid aluminum electrolytic capacitor includes a core package 1, an anode metal shell 2, a cathode metal shell 3, and an annular coating layer 4. Both the anode metal shell 2 and the cathode metal shell 3 are square open structures, and the two openings of the anode metal shell 2 and the cathode metal shell 3 are sleeved with each other and hermetically connected to form a shell. The ends of the anode metal shell 2 and the cathode metal shell 3 away from each other are respectively an anode end 21 and a cathode end 31. The core package 1 is installed in the shell, and the anode region of the core package 1 is electrically connected to the anode end 21, and the cathode region of the core package 1 is electrically connected to the cathode end 31. The annular coating layer 4 is provided on the outer surface of the periphery of the shell, and the material of the annular coating layer 4 is a polymer insulating material, such as polyimide. Tin layers are provided on the outer surfaces of the anode end 21 and the cathode end 31. The setting of the tin layers can facilitate the welding of the capacitor.
[0022] As Figure 2 and 3 shown, in this embodiment, the core package 1 includes four cores 11 and five metal gaskets 12 stacked alternately in sequence. The core 11 includes an anode part 111, a cathode part 112, and a barrier glue 113. The metal gasket 12 is fixedly connected and electrically connected to the anode part 111 of the core 11 to form the anode region of the core package 1. The cathode parts 112 of each core 11 are fixedly connected and electrically connected to form the cathode region of the core package 1. The cathode part of the core 11 from the inside out is a formation foil, a conductive polymer layer, a conductive carbon paste layer, and a conductive silver paste layer in sequence. The material of the metal gasket 12 is copper and copper alloy.
[0023] In this embodiment, the anode part 111 of the core 11 is fixedly connected to the metal gasket 12 by welding, and the cathode parts 112 of each core 11 are fixedly connected by conductive silver glue.
[0024] As Figure 4 and 5 shown, in this embodiment, the anode metal shell 2 includes a positive electrode tube body 22 with an opening at one end, and the other end of the positive electrode tube body 22 is the anode end 21. The cathode metal shell 3 includes a first negative electrode tube body 32 and a second negative electrode tube body 33 connected to each other. The cross-section of the first negative electrode tube body 32 is smaller than that of the second negative electrode tube body 33. An opening is provided at the end of the first negative electrode tube body 32, and the end of the second negative electrode tube body 33 is the cathode end 31. When the anode metal shell 2 and the cathode metal shell 3 are sleeved with each other, the first negative electrode tube body 32 is inserted into the positive electrode tube body 22, and the end of the positive electrode tube body 22 abuts against the end of the second negative electrode tube body 33. The main materials of the anode metal shell 2 and the cathode metal shell 3 are copper and copper alloy.
[0025] In this embodiment, the outer surface and open edge of the anode tube body 22 are covered with an insulating coating, and the outer surfaces of the first cathode tube body 32 and the second cathode tube body 33, the open portion of the first cathode tube body 32, and the inner surface area of the first cathode tube body 32 near the open edge are covered with an insulating coating.
[0026] like Figure 6 As shown, in this embodiment, in order to further increase the area of the pins and improve the firmness of the welding, the capacitor also includes two symmetrically arranged pins 5, and the cross-sectional shape of the pins 5 is "匚"-shaped, and the two pins 5 are respectively tightly attached to the outer surfaces of the anode end 21 and the cathode end 31, and cover the partial area of the annular coating layer 4 close to the anode end 21 and the cathode end 31, and the two pins 5 are respectively electrically connected to the anode end 21 and the cathode end 31, and the outer surfaces of the two pins 5 are provided with a tin layer.
[0027] like Figure 7 The specific preparation process of the above capacitor is as follows: A method for preparing a metal-packaged laminated solid aluminum electrolytic capacitor comprises the following steps: S1: punching the formed aluminum foil into a rectangle, coating the barrier glue 113, forming the anode part 111 and the cathode area of the core, and then sequentially forming a conductive polymer layer, a conductive carbon paste layer, and a conductive silver paste layer on the surface of the cathode area of the core to prepare the cathode part 112, and obtaining the core 1; S2, alternately arranging the anode parts 111 of the four cores 11 and the five rectangular metal gaskets 12, and then achieving the fixed connection between the anode parts 111 and the metal gaskets 12 and the electrical connection between the anode parts 111 by welding, and achieving the fixed connection and electrical connection between the cathode parts 112 of the N cores 11 by bonding and curing with conductive silver glue to obtain the core package 1; S3, bonding the cathode region of the core package 1 to the external cathode metal tube shell 3 through conductive silver glue, so that the cathode region of the core package 1 is electrically connected to the cathode metal tube shell 3, and the anode region of the core package 1 is exposed to the open edge of the cathode metal tube shell 3, and the outer surface, the open edge and the inner surface area close to the open edge of the cathode metal tube shell 3 are covered with an insulating coating; S4, coating the outer surface of the first cathode tube body 32 of the cathode metal tube shell 3 with insulating sealant, fitting the external anode metal tube shell 2 matching the cathode metal tube shell 3 with the cathode metal tube shell 3 to form an airtight connection, and filling the conductive silver glue between the anode area of the core package 1 and the anode metal tube shell 2 to form an electrical connection between the anode area of the core package 1 and the anode metal tube shell 2, so as to obtain a first capacitor semi-finished product, and the outer surface and the open edge surface of the anode metal tube shell 2 are covered with an insulating coating; S5. Wrap the outer surface around the first capacitor semi-finished product with an annular coating layer 4, leaving the positive end portion 21 and the negative end portion 31 exposed to make a second capacitor semi-finished product; S6. Remove the insulating coating on the surfaces of the positive end portion 21 and the negative end portion 31 of the second capacitor semi-finished product, and then form a tin layer on the surfaces of the positive end portion 21 and the negative end portion 31 to make a capacitor, and the tin layer can be formed by electroless plating or electroplating.
[0028] In this embodiment, when the capacitor further includes a "C"-shaped lead 5, step S6 can also be: Remove the insulating coating on the surfaces of the positive end portion 21 and the negative end portion 31 of the second capacitor semi-finished product, and the removal method can be grinding or sandblasting. Then, weld a "C"-shaped lead 5 (the material of the lead is copper and copper alloy) on the surfaces of the positive end portion 21 and the negative end portion 31 respectively. The two leads are arranged oppositely and cover a partial area of the annular coating layer 4 near the positive end portion 21 and the negative end portion 31. Finally, form a tin layer on the outer surface of the lead 5 to make a capacitor.
[0029] It can be known from the above description that: The core idea of the present invention is to alternately stack and weld and fix the anode parts of N capacitor cores and N + 1 metal gaskets, and bond and fix the cathode parts of the cores with conductive silver glue to form a core package; the anode part and the cathode part of the core package are respectively electrically connected to the externally provided anode metal sleeve and cathode metal sleeve through conductive glue to lead out the anode and the cathode; insulating coatings are provided on the outer surface and the open edge surface of the anode metal sleeve, the outer surface, the open edge and the inner surface near the open edge of the cathode metal sleeve, so that the anode metal sleeve and the cathode metal sleeve are not electrically conductive when sleeved, preventing short circuit; the capacitor structure of the present invention integrates the functions of the capacitor housing and the lead-out components. By filling insulating sealant at the joint of the anode sleeve and the cathode sleeve and combining the covering of the annular insulating coating layer at the joint, the airtight packaging is further ensured. In the present invention, the function of the external terminal can be directly realized by exposing the metal substrate at the ends of the two sleeves, and then tin plating to meet the welding requirements. It can also be further achieved by adding a "C"-shaped lead at the end surface to increase the lead area and improve the welding firmness.
[0030] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "coaxial", "bottom", "one end", "top", "middle", "the other end", "up", "one side", "top", "inside", "front", "center", "both ends", etc. is the orientation or positional relationship based on the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to the present invention.
[0031] In the present invention, unless otherwise clearly specified or limited, terms such as "installation", "setting", "connection", "fixation", "swivel connection", etc. shall be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components. Unless otherwise clearly limited, for those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.
[0032] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that these embodiments can be modified without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.
Claims
1. A metal-encapsulated laminated solid aluminum electrolytic capacitor, characterized in that: It includes a core package (1), an anode metal shell (2), a cathode metal shell (3) and an annular coating layer (4). The anode metal shell (2) and the cathode metal shell (3) are both square open structures. The two openings of the anode metal shell (2) and the cathode metal shell (3) are sleeved with each other and hermetically connected to form a shell. The ends of the anode metal shell (2) and the cathode metal shell (3) away from each other are an anode end portion (21) and a cathode end portion (31) respectively. The core package (1) is installed inside the shell, and the anode region of the core package (1) is electrically connected to the anode end portion (21), and the cathode region of the core package (1) is electrically connected to the cathode end portion (31). The annular coating layer (4) is arranged on the outer surface around the shell.
2. The metal-encapsulated laminated solid aluminum electrolytic capacitor according to claim 1, characterized in that: The material of the annular coating layer (4) is a polymer insulating material.
3. A metal-encapsulated laminated solid aluminum electrolytic capacitor according to claim 1, characterized in that: The core package (1) includes N cores (11) and N + 1 metal gaskets (12) stacked alternately in sequence. The core (11) includes an anode portion (111), a cathode portion (112) and a barrier glue (113). The metal gasket (12) is fixedly connected and electrically connected to the anode portion (111) of the core (11) to form the anode region of the core package (1), and the cathode portions (112) of each core (11) are fixedly connected and electrically connected to form the cathode region of the core package (1).
4. A metal-encapsulated laminated solid aluminum electrolytic capacitor according to claim 3, characterized in that: The anode portion (111) of the core (11) is fixedly connected to the metal gasket (12) by welding, and the cathode portions (112) of each core (11) are fixedly connected by conductive silver glue.
5. A metal-encapsulated laminated solid aluminum electrolytic capacitor according to claim 1, characterized in that: The anode metal shell (2) includes a anode tube body (22) with an opening at one end, and the other end of the anode tube body (22) is the anode end portion (21). The cathode metal shell (3) includes a first cathode tube body (32) and a second cathode tube body (33) connected to each other. The cross-section of the first cathode tube body (32) is smaller than that of the second cathode tube body (33). The end of the first cathode tube body (32) is provided with an opening, and the end of the second cathode tube body (33) is the cathode end portion (31). When the anode metal shell (2) and the cathode metal shell (3) are sleeved with each other, the first cathode tube body (32) is inserted into the anode tube body (22), and the end of the anode tube body (22) abuts against the end of the second cathode tube body (33).
6. The metal-encapsulated laminated solid aluminum electrolytic capacitor according to claim 5, wherein: The outer surface and the edge of the opening of the anode tube body (22) are covered with an insulating coating. The outer surfaces of the first cathode tube body (32) and the second cathode tube body (33), the opening portion of the first cathode tube body (32), and the inner surface area of the first cathode tube body (32) near the edge of the opening are covered with an insulating coating.
7. A metal-encapsulated laminated solid aluminum electrolytic capacitor according to claim 1 or 5, characterized in that: The outer surfaces of the anode end portion (21) and the cathode end portion (31) are provided with a tin layer.
8. A metal-encapsulated laminated solid aluminum electrolytic capacitor according to claim 1, characterized in that: The capacitor further comprises two symmetrically arranged pins (5), and the cross-sectional shape of the pins (5) is a "匚" shape. The two pins (5) are respectively closely attached to the outer surfaces of the anode end (21) and the cathode end (31), and cover a portion of the annular coating layer (4) close to the anode end (21) and the cathode end (31). The two pins (5) are respectively electrically connected to the anode end (21) and the cathode end (31), and the outer surfaces of the two pins (5) are both provided with a tin layer.
9. A method for preparing the metal-encapsulated laminated solid aluminum electrolytic capacitor according to any one of claims 1-8, characterized in that: The following steps are involved: S1: punching the formed aluminum foil into a rectangle, coating the barrier glue (113) to form an anode portion (111) and a core cathode region, and then sequentially forming a conductive polymer layer, a conductive carbon paste layer, and a conductive silver paste layer on the surface of the core cathode region to prepare a cathode portion (112), thereby obtaining a core 1; S2, alternately arranging the anode parts (111) of the N-piece cores (11) and the N+1-piece rectangular metal gaskets (12), and then achieving fixed connection between the anode parts (111) and the metal gaskets (12) and electrical connection between the anode parts (111) by welding, and achieving fixed connection and electrical connection between the cathode parts (112) of the N-piece cores (11) by bonding and curing with conductive silver glue, thereby obtaining a core package (1); S3, bonding the cathode region of the core package (1) to the cathode metal tube shell (3) of the external device by means of conductive silver glue, so that the cathode region of the core package (1) is electrically connected to the cathode metal tube shell (3), and the anode region of the core package (1) is exposed to the open edge of the cathode metal tube shell (3), and the outer surface, the open edge and the inner surface area close to the open edge of the cathode metal tube shell (3) are covered with an insulating coating; S4, coating the outer surface of the first cathode tube body (32) of the cathode metal tube shell (3) with an insulating sealant, fitting an external anode metal tube shell (2) matching the cathode metal tube shell (3) with the cathode metal tube shell (3) to form an airtight connection, and simultaneously filling a conductive silver glue between the anode region of the core package (1) and the anode metal tube shell (2) to form an electrical connection between the anode region of the core package (1) and the anode metal tube shell (2), thereby obtaining a first capacitor semi-finished product, wherein the outer surface and the open edge surface of the anode metal tube shell (2) are covered with an insulating coating; S5, wrapping an annular coating layer (4) around the outer surface of the first capacitor semi-finished product, and leaving the anode end (21) and the cathode end (31) exposed, to produce a second capacitor semi-finished product; S6, removing the insulating coating on the surface of the anode end (21) and the cathode end (31) of the second capacitor semi-finished product, and then forming a tin layer on the surface of the anode end (21) and the cathode end (31) to form a capacitor.
10. The preparation method of the metal-encapsulated laminated solid aluminum electrolytic capacitor according to claim 8, wherein: The step S6 may also be: removing the insulating coatings on the surfaces of the positive end portion (21) and the negative end portion (31) of the second capacitor semi-finished product, then respectively welding a "C"-shaped lead (5) on the surfaces of the positive end portion (21) and the negative end portion (31), with the two leads arranged oppositely, covering a partial area of the annular coating layer (4) near the positive end portion (21) and the negative end portion (31), and finally forming a tin layer on the outer surface of the leads (5) to make a capacitor.