Thin high-capacity solid laminated aluminum electrolytic capacitor

Abstract

The utility model relates to a thin high-capacity solid laminated aluminum electrolytic capacitor, which comprises a shell, a laminated core, an anode lead frame and a cathode lead frame, the laminated core is formed by correspondingly stacking and fixing a plurality of monopole sheets; the laminated core is packaged in the shell; the single pole piece takes a valve metal foil as a substrate, one end is an anode region, and the other end is a cathode region; the junction of the anode region and the cathode region is separated by isolation rubber; the anode lead frame is embedded at the bottom of the shell; the upper end surface of the anode lead frame is electrically connected with the anode end of the laminated core, and the lower end surface penetrates through the bottom surface of the shell to be exposed as an anode lead; the cathode lead frame is embedded at the bottom of the shell; the upper end surface of the cathode lead frame is electrically connected with the cathode end of the laminated core; and the lower end surface penetrates through the bottom surface of the shell and is exposed as a cathode. The positive and negative lead frames are embedded into the bottom of the shell and do not need to be bent to serve as electrodes to be led out, the ultra-thin product and the impedance reduction effect are achieved, and the capacitor has the advantages of being small in size and large in capacity at the same time.

Description

Technical Field

[0001] The utility model relates to the technical field of aluminum electrolytic capacitors, in particular to a thin and high-capacity solid-state laminated aluminum electrolytic capacitor. Background Art

[0002] Multilayer capacitors are mainly used in electronic products. With the trend of thinning electronic products and electronic components, capacitors are also becoming thinner. The current structure and manufacturing process of traditional multilayer aluminum electrolytic capacitors are mainly to connect the cathode pins and anode pins of the multilayer core, and then cover the multilayer core with a plastic shell. The anode pins and cathode pins extending on both sides of the shell are then bent along the side of the shell so that the pins face the bottom of the shell. Then, the anode pins and cathode pins are bent a second time toward the bottom of the shell so that the pins are attached to the bottom of the shell to obtain a multilayer aluminum electrolytic capacitor.

[0003] The current multilayer capacitors require a secondary bending of the lead frame after packaging to form the electrode terminal structure, which makes it impossible to design the multilayer capacitors to be thin. If the thickness of the multilayer capacitor body is too thin, the bending force during the pin bending process will damage the structure of the multilayer capacitor, causing the capacitor to rupture and fail. Therefore, traditional multilayer capacitors cannot be small and thin. Currently, the industry is more inclined to reduce the total thickness of the multilayer capacitor by reducing the number of electrode stacks to meet the thinning requirements, but this method will lead to a decrease in capacity and affect the characteristics of the capacitor, especially in terms of impedance, which is difficult to meet the needs of electronic products. Therefore, the structure and process of traditional multilayer capacitors cannot achieve the characteristics of small size and large capacity at the same time, and it is difficult to meet the current demand for thinning electronic products. Utility Model Content

[0004] Based on this, it is necessary to provide a thin, high-capacity solid-state laminated aluminum electrolytic capacitor. By embedding the flat substrate-type positive and negative lead frames into the bottom of the shell without bending them as electrode leads, the design can be further thinned, allowing more monopolar plates to be stacked in a limited space. At the same time, the contact area between the positive and negative lead frames and the laminated core is maximized, achieving ultra-light and thin products and reducing impedance, making the capacitor have the characteristics of small size and high capacity. This solves the problem that traditional capacitors cannot produce thin and miniaturized capacitors due to the pin bending process involved.

[0005] The utility model solves the technical problem by adopting the following technical solutions:

[0006] A thin, high-capacity, solid-state laminated aluminum electrolytic capacitor, characterized by comprising: a shell, a laminated core, an anode lead frame, and a cathode lead frame;

[0007] The laminated core is composed of a number of monopole sheets stacked and fixed in correspondence; the laminated core is encapsulated inside a housing; the monopole sheet is based on a valve metal foil, with one end being the anode region and the other end being the cathode region; the junction of the anode region and the cathode region is separated by an isolation glue;

[0008] The anode lead frame is embedded in the bottom of the shell; the upper end surface of the anode lead frame is electrically connected to the anode end of the laminated core, and the lower end surface is exposed through the bottom surface of the shell as an anode lead; the cathode lead frame is embedded in the bottom of the shell; the upper end surface of the cathode lead frame is electrically connected to the cathode end of the laminated core; the lower end surface is exposed through the bottom surface of the shell as a cathode lead.

[0009] Preferably, the upper end surface of the anode lead frame is set as an anode connection seat; the lower end surface of the anode lead frame is set as an anode terminal; wherein the anode connection seat contacts the anode end of the laminated core and forms an electrical connection; the anode terminal passes through the bottom surface of the shell and is exposed; wherein the exposed part is embedded in the bottom surface of the shell.

[0010] Preferably, the upper end surface of the cathode lead frame is set as a cathode connecting seat; the lower end surface of the cathode lead frame is set as a cathode first terminal and a cathode second terminal; a recessed portion is set between the first cathode terminal and the second cathode terminal; the cathode connecting seat contacts the cathode end of the laminated core and forms an electrical connection; the surface of the recessed portion is covered by the bottom surface of the outer shell; the cathode first terminal and the cathode second terminal pass through the bottom surface of the outer shell and are exposed; wherein the exposed portion is embedded in the bottom surface of the outer shell.

[0011] Preferably, the anode terminal is provided with an anode bent portion at one end extending along the length direction of the bottom surface of the shell; an anode groove is provided inside the junction between the anode bent portion and the anode terminal; and the inner side of the anode bent portion is in contact with the side wall of the shell.

[0012] Preferably, the cathode second terminal is provided with a cathode bent portion at one end extending along the length direction of the bottom surface of the shell; a cathode groove is provided inside the connection between the cathode bent portion and the cathode second terminal; and the inner side of the cathode bent portion is in contact with the side wall of the shell.

[0013] Preferably, the cathode lead frame is provided with walls extending from both sides of the upper end surface in the width direction; wherein the inner side of the wall contacts the side wall of the anode end of the laminated core and forms an electrical connection; the outer side of the wall passes through the side of the shell and is exposed as an electrode lead.

[0014] Preferably, the upper end surface of the anode lead frame is provided with a metal coating; the upper end surface and the inner side of the wall of the cathode lead frame are both provided with a metal coating.

[0015] Preferably, the valve metal foil is one of aluminum foil, copper foil, silver foil and tantalum foil.

[0016] The advantages and positive effects of this utility model are: a thin, high-capacity solid-state multilayer aluminum electrolytic capacitor, which solves the problem in the prior art that traditional multilayer capacitors cannot be produced with both small size and high capacity due to the size limitations of the pin bending process. Compared with the prior art, this utility model has the following advantages:

[0017] By embedding the flattened, substrate-like positive and negative lead frames into the bottom of the housing, they serve as electrode leads without bending. This eliminates the need for bending after packaging, freeing the product's external dimensions from bending constraints. This reduces the product's size while maintaining the same capacitance, achieving a thinner profile. Furthermore, the contact area between the positive and negative lead frames and the laminated core is maximized, effectively optimizing parallel impedance while increasing the current flow area and reducing internal heat generation. The positive and negative lead frames are directly extended to the outside without bending, maximizing the contact area between the positive and negative lead frames and the circuit board, effectively optimizing parallel impedance while increasing the current flow area and reducing external heat generation. Metal plating on the inner end surfaces of the positive and negative lead frames provides electric field isolation, improving the stability and reliability of the multilayer capacitor. This design achieves both lightweight and low impedance, resulting in a capacitor with both small size and high capacitance. This improves safety and stability, and extends the service life of multilayer aluminum electrolytic capacitors. The simple manufacturing process, ease of operation, and low cost meet the current demand for thinner electronic products. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0019] Figure 1 It is a schematic diagram of the appearance of the three-dimensional structure of the utility model.

[0020] Figure 2 This utility model Figure 1 1-1 cross-sectional schematic diagram.

[0021] Figure 3 It is a schematic diagram of the internal three-dimensional structure of the shell of the utility model.

[0022] Figure 4 The utility model is a schematic diagram of the connection between the laminated core and the anode lead frame and the cathode lead frame.

[0023] Figure 5It is a schematic diagram of the three-dimensional structure of the anode lead frame and the cathode lead frame of the utility model.

[0024] Explanation of the accompanying drawings: 1. Shell; 2. Laminated core; 3. Anode lead frame; 4. Cathode lead frame; 5. Metal plating; 201. Monopole; 301. Anode connecting seat; 302. Anode terminal; 303. Anode bending portion; 304. Anode groove; 401. Cathode connecting seat; 402. Wall; 403. Cathode first terminal; 404. Cathode second terminal; 405. Cathode bending portion; 406. Recessed portion; 407. Cathode groove; 2011. Anode region; 2012. Cathode region; 2013. Isolation glue. DETAILED DESCRIPTION

[0025] The embodiments of the present invention are further described in detail with reference to the accompanying drawings: The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of them. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative work are within the scope of protection of the present invention.

[0026] In the description of this utility model, it should be understood that the terms "both sides," "upper," "lower," "top," "bottom," "inner," "outer," and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely to facilitate the description of this utility model and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In the description of this utility model, unless otherwise specified, "plurality" means two or more. In addition, the term "including" and any variations thereof mean "at least including."

[0027] In the description of the present invention, it should be understood that the terms "first", "second", etc. are used to distinguish and do not refer to a sequence of precedence.

[0028] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integrally formed connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0029] like Figure 1-Figure 2 As shown, a thin, high-capacity solid-state laminated aluminum electrolytic capacitor includes: a shell 1, a laminated core 2, an anode lead frame 3, and a cathode lead frame 4; the laminated core 2 is composed of a plurality of monopole sheets 201 stacked and fixed in correspondence; the laminated core 2 is encapsulated inside the shell 1; the monopole sheet 201 is based on a valve metal foil, with one end being an anode region 2011 and the other end being a cathode region 2012; the junction of the anode region 2011 and the cathode region 2012 is separated by an isolation glue 2013; the anode lead frame 3 is embedded in the bottom of the shell 1; the upper end surface of the anode lead frame 3 is electrically connected to the anode end of the laminated core 2, and the lower end surface passes through the bottom surface of the shell 1 to be exposed as an anode lead; the cathode lead frame 4 is embedded in the bottom of the shell 1; the upper end surface of the cathode lead frame 4 is electrically connected to the cathode end of the laminated core 2; the lower end surface passes through the bottom surface of the shell 1 to be exposed as a cathode lead.

[0030] The monopole 201 is based on a valve metal foil, with one end being the anode region 2011 and the other end being the cathode region 2012; the junction of the anode region 2011 and the cathode region 2012 is separated by an isolation glue 2013; specifically, the valve metal foil is one of aluminum foil, copper foil, silver foil, and tantalum foil. The valve metal foil of this embodiment is aluminum foil. An oxide film is formed on the outer surface of the cathode region 2012, a conductive polymer layer is formed on the outer surface of the oxide film, a carbon layer is formed on the surface of the conductive polymer layer, and a metal paste layer is coated on the surface of the carbon layer. In this embodiment, a silver paste layer is used. The isolation glue 2013 insulates and separates the anode region 2011 and the cathode region 2012. The laminated core 2 is composed of a number of monopole sheets 201 stacked and fixed in correspondence. The laminated core 2 is composed of at least one monopole sheet 201, and the number of stacked monopole sheets 201 is set according to the actual application. After stacking several monopolar sheets 201 , the anode regions 2011 between adjacent monopolar sheets 201 are fixed in parallel to form the anode end of the laminated core 2 , and the cathode regions 2012 between adjacent pole sheets are bonded and solidified with silver paste and connected in parallel to form the cathode end of the laminated core 2 .

[0031] The upper end face of the anode lead frame 3 is connected and fixed to the lower end face of the anode terminal of the laminated core 2 as the anode lead, and the upper end face of the cathode lead frame 4 is connected and fixed to the lower end of the cathode terminal of the laminated core 2. By injection molding the laminated core 2 and the anode lead frame 3 and cathode lead frame 4, a laminated aluminum electrolytic capacitor sealed and wrapped with a shell 1 is obtained. The entire lower end face of the anode lead frame 3 is exposed through the bottom surface of the shell 1 as the anode lead. The lower end face of the cathode lead frame 4 is exposed through the bottom surface of the shell 1 as the cathode lead, and the exposed portion can be directly used as a welding foot for the cathode and anode leads, without the need for a bending process on the exposed portion, and the external dimensions of the capacitor can be made thinner and smaller. Since the shell 1 is integrally injection molded, the joints between the sides of the anode lead frame 3 and the cathode lead frame 4 and the shell 1 are sealed and firm.

[0032] Preferably, the upper end surface of the anode lead frame 3 is set as an anode connection seat 301; the lower end surface of the anode lead frame 3 is set as an anode terminal 302; wherein the anode connection seat 301 contacts the anode end of the laminated core 2 and forms an electrical connection; the anode terminal 302 passes through the bottom surface of the shell 1 and is exposed; wherein the exposed part is embedded in the bottom surface of the shell 1.

[0033] Specifically, the upper surface of the anode connector 301 on the upper end face of the anode lead frame 3 can completely align with the lower surface of the anode end of the laminated core 2, thereby increasing the contact area between the anode lead frame 3 and the anode end of the laminated core 2. This effectively optimizes the anode parallel impedance, while increasing the area through which current passes, reducing internal heat generation, and improving stability. The anode terminal 302 at the lower end of the anode lead frame 3 and the anode connector 301 at the upper end are structurally in an upper-lower relationship. There is no need to bend the anode terminal 302, and the size can be further miniaturized, thereby improving space utilization. This structure, on the one hand, shortens the current transmission distance and improves electrical transmission performance. On the other hand, the area of ​​the anode terminal 302 is maximized, thereby improving the welding stability and heat transfer between the anode terminal 302 and the circuit board.

[0034] Preferably, Figure 1 As shown, the upper end surface of the cathode lead frame 4 is set as a cathode connecting seat 401; the lower end surface of the cathode lead frame 4 is set as a cathode first terminal 403 and a cathode second terminal 404; a recessed portion 406 is set between the first cathode terminal 403 and the second cathode terminal 404; the cathode connecting seat 401 contacts the cathode end of the laminated core 2 and forms an electrical connection; the surface of the recessed portion 406 is covered by the bottom surface of the shell 1; the first cathode terminal 403 and the second cathode terminal 404 pass through the bottom surface of the shell 1 and are exposed; the exposed portions are embedded in the bottom surface of the shell 1.

[0035] Specifically, such as Figure 4-5As shown, the surface of the cathode connector 401 on the upper end of the cathode lead frame 4 is completely aligned with the lower surface of the cathode end of the laminated core 2, increasing the contact area between the cathode lead frame 3 and the cathode end of the laminated core 2. This effectively optimizes the cathode parallel impedance, increases the area for current flow, reduces internal heat generation in the negative electrode, and improves stability.

[0036] The cathode first terminal 403 and the cathode second terminal 404 at the lower end of the cathode lead frame 4 are structurally in a vertical relationship with the cathode connecting seat 401 at the upper end, wherein the upper ends of the cathode first terminal 403 and the cathode second terminal 404 are in the same plane as the cathode connecting seat 401.

[0037] There is no need to bend the cathode first terminal 403 and the cathode second terminal 404, and the size can be further miniaturized, thereby improving space utilization. On the one hand, this structure shortens the current transmission distance and improves the electrical transmission performance. On the other hand, the area of ​​the cathode first terminal 403 and the cathode second terminal 404 is maximized, thereby improving the welding stability and heat transfer between the cathode first terminal 403, the cathode second terminal 404 and the circuit board.

[0038] By providing a recessed portion 406 and having the surface of the recessed portion 406 covered by the bottom surface of the shell 1, the cathode lead frame 4 is limited and fixed, preventing the cathode lead frame 4 from moving outward, further improving the rigid connection between the cathode lead frame 4 and the shell 1, and at the same time further improving the sealing between the cathode lead frame 4 and the shell 1.

[0039] In some embodiments, Figure 1-Figure 2 As shown, the anode terminal 302 is provided with an anode bent portion 303 at one end extending along the length direction of the bottom surface of the shell 1; an anode groove 304 is provided inside the connection between the anode bent portion 303 and the anode terminal 302; the inner side of the anode bent portion 303 is in contact with the side wall of the shell 1.

[0040] By providing an anode bent portion 303 at one end of the anode terminal 302 extending along the length of the bottom surface of the housing 1, the anode lead-out area is further expanded. The inner side of the anode bent portion 303 is in contact with the side wall of the housing 1, thereby improving the fit between the anode lead frame 3 and the housing. An anode groove 304 is provided on the inner side of the junction between the anode bent portion 303 and the anode terminal 302. The structure of the anode groove 304 further extends the path for external water vapor to enter, further improving the sealing. The anode groove 304 structure further strengthens the bonding between the anode lead frame 3 and the housing 1, thereby improving stability. During installation and use, the anode terminal 302 is welded to the circuit board in the horizontal direction, and the anode bent portion 303 is welded to the circuit board in the vertical direction. Through multi-directional welding, the stability of the laminated aluminum electrolytic capacitor is improved.

[0041] In some embodiments, Figure 1-Figure 2 As shown, the cathode second terminal 404 is provided with a cathode bent portion 405 at one end extending along the length direction of the bottom surface of the shell 1; a cathode groove 407 is provided inside the connection between the cathode bent portion 405 and the cathode second terminal 404; the inner side of the cathode bent portion 405 is in contact with the side wall of the shell 1.

[0042] By providing a cathode bend 405 at one end of the cathode second terminal 404 extending along the length of the bottom surface of the housing 1, the cathode lead-out area is further expanded. The inner side of the cathode bend 405 is in contact with the side wall of the housing 1, improving the fit between the cathode lead frame 4 and the housing. A cathode groove 407 is provided on the inner side of the junction between the cathode bend 405 and the cathode second terminal 404. The structure of the cathode groove 407 further extends the path for external moisture to enter, further improving the sealing. The cathode groove 407 structure further strengthens the connection between the cathode lead frame 4 and the housing 1, thereby improving stability. During installation and use, the cathode first terminal 403 and the cathode second terminal 404 are welded to the circuit board in the horizontal direction, and the cathode bend 405 is welded to the circuit board in the vertical direction. Through multi-directional welding, the stability of the laminated aluminum electrolytic capacitor is improved.

[0043] In some embodiments, preferably, a wall portion 402 is provided at the end extending on both sides of the upper end surface in the width direction of the cathode lead frame 4; wherein the inner side of the wall portion 402 contacts the side wall of the anode end of the laminated core 2 and forms an electrical connection; the outer side of the wall portion 402 passes through the side of the shell 1 and is exposed as an electrode lead.

[0044] Specifically, such as Figure 1 、 Figure 3 、 Figure 5 As shown, the wall portion 402 is perpendicular to the upper end surface of the cathode lead frame 4. The number of wall portions 402 is not limited. In this embodiment, the wall portions 402 are two symmetrically arranged wall portions 402. When the monopole sheets 201 are stacked on the cathode connector 401, the side surfaces of the monopole sheets 201 contact the inner surfaces of the wall portions 402. The inner surfaces of the wall portions 402 serve to connect the side surfaces of the monopole sheets 201, thereby enhancing the parallel effect between the monopole sheets 201 and reducing the equivalent series resistance (ESR) between the sheets. The outer surface of the wall portion 402 extends beyond the outer surface of the housing 1 to be exposed as an electrode lead, further increasing the lead area of ​​the negative electrode, optimizing the equivalent parallel impedance, and improving the weldability and heat dissipation of the negative electrode.

[0045] In some embodiments, Figure 5As shown, preferably, a metal coating 5 is provided on the upper surface of the anode lead frame 3; a metal coating 5 is provided on the upper surface of the cathode lead frame 4 and the inner side of the wall portion 402. Providing the metal coating 5 on the upper surface of the anode lead frame 3 and the upper surface of the cathode lead frame 4 achieves an electric field isolation effect, thereby improving the stability and reliability of the multilayer capacitor.

[0046] In some embodiments, the upper surface of the anode lead frame 3, the upper surface of the cathode lead frame 4 and the inner side of the wall 402 are coated with conductive glue, such as silver paste, which can fill the gaps between the laminated core 2 and the anode connecting seat 301, the cathode connecting seat 401 and the wall 402, further increasing the output contact area, effectively optimizing the parallel impedance, and improving the stability of the laminated aluminum electrolytic capacitor.

[0047] This design achieves lightweighting and reduced impedance without changing capacitance, resulting in a capacitor with both small size and high capacitance. This improves safety and stability, and extends the life of the multilayer aluminum electrolytic capacitor. Furthermore, the manufacturing process is simple, easy to operate, and low-cost, meeting the demand for thinner electronic products.

[0048] It should be emphasized that the embodiments described in the present invention are illustrative rather than restrictive. Therefore, the present invention is not limited to the embodiments described in the specific implementation methods. Any other implementation methods derived by those skilled in the art based on the technical solution of the present invention also fall within the scope of protection of the present invention.

Claims

1. A thin, high-capacity, solid-state multilayer aluminum electrolytic capacitor, characterized in that include: Housing (1), laminated core (2), anode lead frame (3), cathode lead frame (4); The laminated core (2) is composed of a plurality of monopole sheets (201) stacked and fixed in correspondence; the laminated core (2) is encapsulated inside the housing (1); the monopole sheet (201) is based on a valve metal foil, one end of the monopole sheet is an anode region (2011) and the other end is a cathode region (2012); the junction of the anode region (2011) and the cathode region (2012) is separated by an isolation glue (213); The anode lead frame (3) is embedded in the bottom of the shell (1); the upper end surface of the anode lead frame (3) is electrically connected to the anode end of the laminated core (2), and the lower end surface is exposed through the bottom surface of the shell (1) as an anode lead; the cathode lead frame (4) is embedded in the bottom of the shell (1); the upper end surface of the cathode lead frame (4) is electrically connected to the cathode end of the laminated core (2); the lower end surface is exposed through the bottom surface of the shell (1) as a cathode lead.

2. The thin, high-capacity, solid-state multilayer aluminum electrolytic capacitor according to claim 1, characterized in that: The upper end surface of the anode lead frame (3) is provided as an anode connection seat (301); the lower end surface of the anode lead frame (3) is provided as an anode terminal (302); wherein the anode connection seat (301) contacts the anode end of the laminated core (2) and forms an electrical connection; the anode terminal (302) penetrates the bottom surface of the shell (1) and is exposed; wherein the exposed portion is embedded in the bottom surface of the shell (1).

3. The thin, high-capacity, solid-state multilayer aluminum electrolytic capacitor according to claim 1, characterized in that: The upper end surface of the cathode lead frame (4) is configured as a cathode connection seat (401); the lower end surface of the cathode lead frame (4) is configured as a cathode first terminal (403) and a cathode second terminal (404); a recessed portion (406) is provided between the cathode first terminal (403) and the cathode second terminal (404); the cathode connection seat (401) contacts the cathode end of the laminated core (2) and forms an electrical connection; the surface of the recessed portion (406) is covered by the bottom surface of the shell (1); the cathode first terminal (403) and the cathode second terminal (404) penetrate through the bottom surface of the shell (1) and are exposed; wherein the exposed portion is embedded in the bottom surface of the shell (1).

4. The thin, high-capacity, solid-state multilayer aluminum electrolytic capacitor according to claim 2, wherein: The anode terminal (302) is provided with an anode bent portion (303) at one end extending along the length direction of the bottom surface of the shell (1); an anode groove (304) is provided on the inner side of the junction between the anode bent portion (303) and the anode terminal (302); and the inner side of the anode bent portion (303) is in contact with the side wall of the shell (1).

5. The thin, high-capacity, solid-state multilayer aluminum electrolytic capacitor according to claim 3, characterized in that: The cathode second terminal (404) is provided with a cathode bent portion (405) at one end extending along the length direction of the bottom surface of the shell (1); a cathode groove (407) is provided on the inner side of the connection between the cathode bent portion (405) and the cathode second terminal (404); and the inner side of the cathode bent portion (405) is in contact with the side wall of the shell (1).

6. The thin, high-capacity, solid-state multilayer aluminum electrolytic capacitor according to claim 1, characterized in that: The cathode lead frame (4) is provided with wall portions (402) extending from both sides of the upper end surface in the width direction; the inner side of the wall portion (402) contacts the anode end side wall of the laminated core (2) and forms an electrical connection; the outer side of the wall portion (402) passes through the side of the shell (1) and is exposed as an electrode lead.

7. The thin, high-capacity, solid-state multilayer aluminum electrolytic capacitor according to claim 1, characterized in that: The upper end surface of the anode lead frame (3) is provided with a metal coating (5); the upper end surface of the cathode lead frame (4) and the inner side of the wall portion (402) are both provided with a metal coating (5).

8. The thin, high-capacity, solid-state multilayer aluminum electrolytic capacitor according to claim 1, characterized in that: The valve metal foil is one of aluminum foil, copper foil, silver foil and tantalum foil.

Images