Thin high-capacity solid laminated aluminum electrolytic capacitor

Abstract

The invention 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 invention 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 parts, capacitors are also becoming thinner. At present, the structure and manufacturing process of traditional multilayer aluminum electrolytic capacitors are mainly to connect the cathode pin and the anode pin of the multilayer core, and then cover the multilayer core with a plastic shell, and then bend the anode pin and cathode pin extending on both sides of the shell along the side of the shell so that the pins face the bottom of the shell, and then bend the anode pin and cathode pin toward the bottom of the shell for a second time so that the pins are attached to the bottom of the shell to obtain a multilayer aluminum electrolytic capacitor.

[0003] After the current multilayer capacitor is packaged, the lead frame needs to be bent twice to serve as the electrode terminal structure, which makes it impossible to design the multilayer capacitor 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 focused on reducing the number of electrode stacks to reduce the total thickness of the multilayer capacitor to meet the thinning requirements, but this method will cause 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 have the characteristics of small size and large capacity at the same time, and it is difficult to meet the current demand for thin electronic products. Summary of the invention

[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 as electrode leads, the thinner design can be achieved, so that more single-pole sheets can 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, so as to achieve ultra-light and thin products and reduce impedance, so that the capacitor has the characteristics of small size and large capacity at the same time. It solves the problem that traditional capacitors cannot produce thin miniaturized capacitors due to the pin bending process.

[0005] The present invention solves the technical problem by adopting the following technical solutions: 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; The laminated core is composed of a number of monopolar sheets stacked and fixed in correspondence; the laminated core is encapsulated inside the shell; the monopolar sheet is based on valve metal foil, one end is the anode area and the other end is the cathode area; the junction of the anode area and the cathode area is separated by an isolation glue; 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.

[0006] 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 penetrates through the bottom surface of the shell and is exposed; wherein the exposed portion is embedded in the bottom surface of the shell.

[0007] 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.

[0008] 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.

[0009] Preferably, the cathode second terminal is provided with a cathode bending portion at one end extending along the length direction of the bottom surface of the shell; a cathode groove is provided on the inner side of the connection between the cathode bending portion and the cathode second terminal; and the inner side of the cathode bending portion is in contact with the side wall of the shell.

[0010] Preferably, the cathode lead frame has walls extending from both sides of the upper end surface in the width direction; the inner side of the wall contacts and forms an electrical connection with the anode end side wall of the laminated core; the outer side of the wall passes through the side of the shell and is exposed as an electrode lead.

[0011] Preferably, the upper end surface of the anode lead frame is provided with a metal coating; the upper end surface of the cathode lead frame and the inner side of the wall are both provided with a metal coating.

[0012] Preferably, the valve metal foil is one of aluminum foil, copper foil, silver foil and tantalum foil.

[0013] The advantages and positive effects of the present invention are: a thin, high-capacity solid-state laminated aluminum electrolytic capacitor, which is used to solve the problem in the prior art that the traditional laminated capacitor cannot be prepared with a small volume and high capacity due to the size limitation of the pin bending process. Compared with the prior art, the present invention has the following advantages: By embedding the flattened positive and negative lead frames of the substrate into the bottom of the shell without bending as electrode leads, on the one hand, there is no need to bend the positive and negative lead frames after the packaging is completed, so the product appearance size is not constrained by the bending process, and then the product volume can be reduced while keeping the capacity unchanged, and the product thinning can be achieved. On the other hand, the contact area between the positive and negative lead frames and the laminated core is maximized, which effectively optimizes the parallel impedance and increases the current passing area while reducing the internal heat source. The positive and negative lead frames are directly led out without bending, and the contact area between the positive and negative lead frames and the circuit board is maximized, which effectively optimizes the parallel impedance and increases the current passing area while reducing the external heat source. The inner end faces of the positive and negative lead frames are provided with metal plating, which has the effect of isolating the electric field and improving the stability and reliability of the laminated capacitor. The design realizes the lightness and thinness of the product and reduces the impedance, so that the capacitor has the characteristics of small volume and large capacity at the same time. It improves its safety and stability, and prolongs the service life of the laminated aluminum electrolytic capacitor. In addition, the manufacturing process is simple, the operation is convenient, and the cost is low, which can meet the current demand for thinning electronic products. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. 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 creative work.

[0015] Figure 1 It is a schematic diagram of the appearance of the three-dimensional structure of the present invention.

[0016] Figure 2 The present invention Figure 1 1-1 is a schematic cross-sectional view of FIG.

[0017] Figure 3 It is a schematic diagram of the internal three-dimensional structure of the shell of the present invention.

[0018] Figure 4 The invention is a schematic diagram of the connection between the laminated core and the anode lead frame and the cathode lead frame.

[0019] Figure 5 It is a schematic diagram of the three-dimensional structure of the anode lead frame and the cathode lead frame of the present invention.

[0020] Explanation of the accompanying drawings: 1. shell; 2. laminated core; 3. anode lead frame; 4. cathode lead frame; 5. metal plating; 201. monopole sheet; 301. anode connection seat; 302. anode terminal; 303. anode bending portion; 304. anode groove; 401. cathode connection 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

[0021] The embodiments of the present invention are further described in detail in conjunction with the accompanying drawings: The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means 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 creative work are within the scope of protection of the present invention.

[0022] In the description of the present invention, it should be understood that the terms "both sides", "upper", "lower", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention. In the description of the present invention, unless otherwise specified, "plurality" means two or more. In addition, the term "include" and any variation thereof all mean "at least include".

[0023] 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.

[0024] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integrally formed connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0025] like Figure 1-Figure 2As shown, a thin and high-capacity solid-state laminated aluminum electrolytic capacitor comprises: 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 monopolar sheets 201 that are stacked and fixed in correspondence; the laminated core 2 is encapsulated inside the shell 1; the monopolar sheet 201 is based on a valve metal foil, one end of which is an anode region 2011 and the other end of which is 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.

[0026] 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 isolating 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, and an oxide film is formed on the outer surface of the cathode region 2012, and 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 slurry layer is coated on the surface of the carbon layer. In this embodiment, a silver slurry layer is used. The isolating 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 that are 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 a number of monopolar sheets 201 are stacked, 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 in parallel through silver paste to form the cathode end of the laminated core 2 .

[0027] The upper end surface of the anode lead frame 3 is connected and fixed to the lower end surface of the anode terminal of the laminated core 2 as the anode lead, and the upper end surface 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 the cathode lead frame 4, a laminated aluminum electrolytic capacitor with a sealed package of the shell 1 is obtained. The entire lower end surface of the anode lead frame 3 is exposed through the bottom surface of the shell 1 as the anode lead. The lower end surface of the cathode lead frame 4 is exposed through the bottom surface of the shell 1 as the cathode lead, and the exposed part can be directly used as the welding foot of the cathode and anode leads, without the need for bending the exposed part, and the appearance size of the capacitor can be made thin and miniaturized. Because 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.

[0028] 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 outer shell 1 and is exposed; wherein the exposed part is embedded in the bottom surface of the outer shell 1.

[0029] Specifically, the upper surface of the anode connection seat 301 on the upper end face of the anode lead frame 3 can be completely matched 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. The anode parallel impedance is effectively optimized, while the area through which the current passes is increased, the internal heat source generation is reduced, and the stability is improved. The anode terminal 302 at the lower end of the anode lead frame 3 and the anode connection seat 301 at the upper end are in a vertical relationship in structure. There is no need to bend the anode terminal 302, and the size can be further miniaturized, thereby improving the space utilization. On the one hand, this structure shortens the transmission distance of the current and improves the 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.

[0030] 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; wherein the exposed portion is embedded in the bottom surface of the shell 1.

[0031] Specifically, Figure 4-5 As shown, the surface of the cathode connection seat 401 on the upper end surface of the cathode lead frame 4 is completely in contact with the lower surface of the cathode end of the laminated core 2, thereby 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 through which the current passes, reduces the generation of heat sources inside the negative electrode, and improves stability.

[0032] 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 connection 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 connection seat 401.

[0033] 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.

[0034] By providing a recessed portion 406 and having the surface of the recessed portion 406 covered by the bottom surface of the outer shell 1, the cathode lead frame 4 is limited and fixed to prevent the cathode lead frame 4 from moving outward, thereby further improving the rigid connection between the cathode lead frame 4 and the outer shell 1 and further improving the sealing between the cathode lead frame 4 and the outer shell 1.

[0035] In some embodiments, Figure 1-Figure 2 As shown, the anode terminal 302 is provided with an anode bending 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 bending portion 303 and the anode terminal 302; and the inner side of the anode bending portion 303 is in contact with the side wall of the shell 1.

[0036] By providing an anode bent portion 303 at one end of the anode terminal 302 extending along the length direction of the bottom surface of the shell 1, the anode lead-out area is further expanded, wherein the inner side of the anode bent portion 303 is in contact with the side wall of the shell 1, thereby improving the fit between the anode lead frame 3 and the shell, and an anode groove 304 is provided on the inner side of the junction between the anode bent portion 303 and the anode terminal 302, wherein the structure of the anode groove 304 further extends the path for external water vapor to enter, thereby further improving the sealing. The anode groove 304 structure further strengthens the bonding between the anode lead frame 3 and the shell 1, thereby improving the stability. When installed and used, 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.

[0037] In some embodiments, Figure 1-Figure 2 As shown, a cathode bending portion 405 is provided at one end of the cathode second terminal 404 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 bending portion 405 and the cathode second terminal 404; and the inner side of the cathode bending portion 405 is in contact with the side wall of the shell 1.

[0038] By providing a cathode bent portion 405 at one end of the cathode second terminal 404 extending along the length direction of the bottom surface of the shell 1, the cathode lead-out area is further expanded, wherein the inner side of the cathode bent portion 405 is in contact with the side wall of the shell 1, thereby improving the fit between the cathode lead frame 4 and the shell, and 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, wherein the structure of the cathode groove 407 further extends the path for external water vapor to enter, thereby further improving the sealing. The cathode groove 407 structure further strengthens the bonding between the cathode lead frame 4 and the shell 1, thereby improving the stability. When installed and used, the cathode first terminal 403 and the cathode second terminal 404 are welded to the circuit board in the horizontal direction, and the cathode bent portion 405 is welded to the circuit board in the vertical direction, and the stability of the laminated aluminum electrolytic capacitor is improved through multi-directional welding.

[0039] 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.

[0040] Specifically, Figure 1 , Figure 3 , Figure 5 As shown, the wall 402 is perpendicular to the upper end surface of the cathode lead frame 4, wherein the number of the wall 402 is not limited. In this embodiment, the wall 402 is two symmetrically arranged wall portions 402. When the monopolar sheet 201 is stacked on the cathode connection seat 401, the side of the monopolar sheet 201 contacts the inner side of the wall 402. The inner side of the wall 402 plays the role of connecting the side of the monopolar sheet 201, thereby improving the parallel effect between the monopolar sheets 201 and reducing the equivalent series resistance (ESR) value between the sheets. The outer side of the wall 402 passes through the outer side of the housing 1 and is exposed as an electrode lead, further increasing the lead-out area of ​​the negative electrode, optimizing the equivalent parallel impedance, and improving the weldability and heat dissipation of the negative electrode.

[0041] In some embodiments, Figure 5 As 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. By providing the metal coating 5 on the upper surface of the anode lead frame 3; and providing the metal coating 5 on the upper surface of the cathode lead frame 4, an electric field isolation effect is achieved, thereby improving the stability and reliability of the multilayer capacitor.

[0042] 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 a conductive glue, such as silver paste, which can fill the gaps between the laminated core 2 and the anode connector 301, the cathode connector 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.

[0043] This design achieves the effect of thinning and reducing impedance without changing the capacity, making the capacitor have the characteristics of small size and large capacity. It improves its safety and stability and prolongs the service life of the laminated aluminum electrolytic capacitor. The manufacturing process is simple, the operation is convenient, and the cost is low, which can meet the current demand for thinning electronic products.

[0044] It should be emphasized that the embodiments described in the present invention are illustrative rather than restrictive, and therefore the present invention is not limited to the embodiments described in the specific implementation manners. Any other implementation manners derived by those skilled in the art based on the technical solutions of the present invention also fall within the scope of protection of the present invention.

Claims

1. A thin, high-capacity, solid-state laminated aluminum electrolytic capacitor, characterized in that include: Shell (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) has a valve metal foil as a base, one end of the monopole sheet (201) 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 (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); and the lower end surface passes through the bottom surface of the shell (1) to be exposed as a cathode lead.

2. A thin, high-capacity solid-state laminated 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 through the bottom surface of the outer shell (1) and is exposed; wherein the exposed portion is embedded in the bottom surface of the outer shell (1).

3. The thin and high capacity solid-state laminated aluminum electrolytic capacitor according to claim 1, characterized in that: The upper end surface of the cathode lead frame (4) is arranged as a cathode connection seat (401); the lower end surface of the cathode lead frame (4) is arranged as a cathode first terminal (403) and a cathode second terminal (404); a recessed portion (406) is arranged 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. A thin, high-capacity solid-state laminated aluminum electrolytic capacitor according to claim 2, characterized in that: 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 and high capacity solid-state laminated 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. A thin, high-capacity solid-state laminated 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. A thin, high-capacity solid-state laminated 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 and high capacity solid-state laminated 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.

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