Aluminum wire type polymer capacitor and preparation method thereof

Abstract

The invention discloses an aluminum wire type polymer capacitor. The aluminum wire type polymer capacitor comprises a shell and a capacitor main body, the capacitor main body comprises a stacked aluminum wire structure and current-conducting plates, the current-conducting plates comprise an anode current-conducting plate and a cathode current-conducting plate, the stacked aluminum wire structure is provided with an anode region and a cathode region, the anode region of the stacked aluminum wire structure is fixedly connected with the anode current-conducting plate, and the cathode region of the stacked aluminum wire structure is fixedly connected with the cathode current-conducting plate; the stacked aluminum wire structure is composed of more than one stacked aluminum wire unit; the stacked aluminum wire unit is composed of a plurality of aluminum wires which are connected in parallel. The stacked aluminum wire structure is arranged to replace an aluminum foil structure of a traditional laminated capacitor, and the capacity and ripple current resistance of the capacitor are greatly improved on the premise that the small size and equivalent series resistance of the capacitor are guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of aluminum electrolytic capacitors, and more specifically, to an aluminum wire-type polymer capacitor and a preparation method thereof. Background Art

[0002] Conductive polymer laminated aluminum capacitors are a new type of aluminum capacitors. They use conductive polymers as electrolytes, adopt a multi-layer core parallel combination, and are epoxy resin encapsulated and cured. Compared with traditional aluminum electrolytic capacitors, conductive polymer laminated aluminum capacitors have excellent performance such as small size, small leakage current, long life and good storage stability. However, with the increasing performance requirements of electronic products, the existing conductive polymer aluminum capacitors have gradually revealed their shortcomings in terms of capacity and equivalent series resistance, especially in high-frequency and high-current working environments, which put forward higher requirements for capacitor capacity while requiring the reduction of equivalent series resistance to improve power efficiency and ensure system stability.

[0003] Chinese invention patent 201711151480.1 discloses a stacked capacitor, including multiple stacked monomers, and positive and negative lead terminals electrically connected to the monomers, each monomer including a positive terminal, a negative terminal and a shielding rubber wire located between the positive terminal and the negative terminal; the negative terminals of each monomer are connected together and connected to the negative lead terminal; the positive terminals of each monomer are connected together and connected to the positive lead terminal, the negative terminal of each monomer includes a dielectric film, a solid electrolyte layer, a carbon paste layer and a silver paste layer sequentially coated on the surface of the positive foil, the outer surface of the multiple monomers is encapsulated with an insulating resin layer, and the stacked capacitor also includes an anti-sulfurization protection frame arranged near the negative lead terminal to prevent sulfur and sulfide in the air from contacting the silver paste layer. Although the above invention patent has a good anti-sulfurization effect, the polymer capacitor of this structure has a small capacity and a large equivalent series resistance, which cannot meet the requirements of a large current working environment.

[0004] Therefore, there is an urgent need to find a technical solution to further increase the capacity of polymer capacitors while reducing the equivalent series resistance of the capacitors. Summary of the invention

[0005] Based on this, it is necessary to provide an aluminum wire type polymer capacitor with stable structure, impact resistance and large capacity to address the above technical problems.

[0006] In order to solve the above technical problems, the present invention provides an aluminum wire type polymer capacitor and a preparation method thereof, which adopts the following technical solution:

[0007] The first aspect of the present invention provides an aluminum wire type polymer capacitor, which includes a shell and a capacitor body;

[0008] The capacitor body comprises a stacked aluminum wire structure and a conductive plate, wherein the conductive plate comprises an anode conductive plate and a cathode conductive plate, the stacked aluminum wire structure is provided with an anode region and a cathode region, the anode region of the stacked aluminum wire structure is fixedly connected to the anode conductive plate, and the cathode region of the stacked aluminum wire structure is fixedly connected to the cathode conductive plate;

[0009] The stacked aluminum wire structure is composed of more than one stacked aluminum wire unit; and the stacked aluminum wire unit is composed of a plurality of parallel aluminum wires.

[0010] Furthermore, the stacked aluminum wire structure is composed of a plurality of stacked aluminum wire units, and the plurality of stacked aluminum wire units are arranged on the front and back sides of the conductive plate, and the number of stacked aluminum wire units on the front and back sides of the conductive plate is the same.

[0011] Furthermore, the stacked aluminum wire structure is composed of a first stacked aluminum wire unit and a second stacked aluminum wire unit. The first stacked aluminum wire unit and the second stacked aluminum wire unit are arranged on the front and back sides of the conductive plate to form a sandwich structure with the conductive plate.

[0012] Furthermore, the stacked aluminum wire unit is composed of more than one layer of parallel aluminum wires, and each layer of aluminum wires is arranged horizontally.

[0013] Furthermore, each of the stacked aluminum wire units has the same number of aluminum wire layers and arrangement.

[0014] Furthermore, when each layer of aluminum wires is arranged horizontally, a heat dissipation spacing is reserved between the aluminum wires, and the heat dissipation spacing is 0.2 mm to 0.4 mm.

[0015] Furthermore, the aluminum purity of the aluminum wire is ≥99.7%, and the diameter of the aluminum wire is 1 mm to 3 mm.

[0016] Furthermore, the conductive plate includes an anode conductive plate and a cathode conductive plate arranged vertically, the stacked aluminum wire unit is provided with an anode region and a cathode region, the anode region of the stacked aluminum wire unit is welded to the anode conductive plate, and the cathode region of the stacked aluminum wire unit is bonded and fixed to the cathode conductive plate.

[0017] Furthermore, the cathode region of the aluminum wire is provided with a conductive polymer layer, a graphite layer and a silver paste layer in sequence from the inside to the outside.

[0018] A second aspect of the present invention provides a method for preparing an aluminum wire type polymer capacitor, comprising the following steps:

[0019] S1. Prepare aluminum wires and apply insulating glue at the same height of each aluminum wire to form an insulating glue layer, and distinguish the long end of the aluminum wire as the cathode area and the short end as the anode area;

[0020] S2, forming a conductive polymer layer, a graphite layer and a silver paste layer in the cathode region of the aluminum wire in sequence;

[0021] S3, aligning the anode areas and cathode areas of several aluminum wires and arranging them side by side horizontally to form a single layer of aluminum wires, and then stacking multiple layers of aluminum wires on the front and back sides of the conductive plate in sequence to form a stacked aluminum wire unit, wherein the cathode areas of each layer of aluminum wires and the cathode areas of the aluminum wires and the common cathode areas are bonded to each other through a silver paste layer, and the anode areas of each layer of aluminum wires and the anode areas of the aluminum wires and the common anode areas are welded and fixed to each other;

[0022] S4, winding the insulating tape around the outer sides of the stacked aluminum wire units on the front and back sides of the common anode area, and filling the gap between the insulating tape and the anode area of ​​the stacked aluminum wire units with an insulating coating to form a capacitor body;

[0023] S5. Encapsulate the capacitor body.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] The aluminum wire type polymer capacitor provided by the present invention replaces the aluminum foil structure of the traditional stacked capacitor by arranging a stacked aluminum wire structure, thereby greatly improving the capacity and ripple current resistance of the capacitor while ensuring a small volume and equivalent series resistance of the capacitor; the anode area of ​​the stacked aluminum wire structure is fixed with the aid of insulating tape, and the cathode area of ​​the stacked aluminum wire structure is fixed with the aid of the fixing foot structure of the cathode conductive plate, thereby improving the vibration resistance of the overall structure of the capacitor and reducing the risk of failure of the capacitor during packaging and practical use. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the solutions in the present application or the prior art, a brief introduction is given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0027] Figure 1 It is a schematic diagram of the structure of the aluminum wire polymer capacitor of the present invention;

[0028] Figure 2 It is a schematic structural diagram of a capacitor body of an aluminum wire type polymer capacitor of the present invention;

[0029] Figure 3 It is a structural schematic diagram of the anode conductive plate of the aluminum wire type polymer capacitor of the present invention;

[0030] Figure 4 It is a schematic structural diagram of the cathode conductive plate of the aluminum wire type polymer capacitor of the present invention;

[0031] Figure 5 It is a schematic structural diagram of the stacked aluminum wire unit of the aluminum wire type polymer capacitor of the present invention;

[0032] Figure 6 It is a schematic diagram of the structure of the aluminum wire of the aluminum wire type polymer capacitor of the present invention;

[0033] Figure 7 This is a schematic diagram of the structure of an aluminum wire polymer capacitor proposed in Example 6 of the present invention;

[0034] Figure 8 This is a structural decomposition diagram of the aluminum wire type polymer capacitor proposed in Example 6 of the present invention.

[0035] Description of reference numerals:

[0036] Shell 1, upper packaging shell 11, lower packaging shell 12;

[0037] Cathode conductive plate 2, common cathode region 21, first fixed foot 22, second fixed foot 23, cathode pin 24;

[0038] A stacked aluminum wire structure 3, a first stacked aluminum wire unit 31, a second stacked aluminum wire unit 32, a third stacked aluminum wire unit 33, a fourth stacked aluminum wire unit 34, a fifth stacked aluminum wire unit 35, and a sixth stacked aluminum wire unit 36;

[0039] Aluminum wire 301, insulation coating 3011, insulation glue layer 3012, conductive polymer layer 3013, graphite layer 3014, silver paste layer 3015, silver paste layer 3016;

[0040] Anode conductive plate 4, common anode area 41, anode pin 42;

[0041] Insulation tape5. DETAILED DESCRIPTION

[0042] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the 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. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0043] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0044] In addition, the terms "first", "second", and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second", and "third" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0045] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings.

[0046] Example 1

[0047] Please refer to Figures 1 to 6 The present embodiment provides an aluminum wire type polymer capacitor, which includes a shell 1 and a capacitor body, wherein the shell 1 includes an upper packaging shell 11 and a lower packaging shell 12, and the capacitor body is placed inside a cavity formed by the upper packaging shell 1 and the lower packaging shell 2, and a pin structure is led out of the capacitor body to the outside of the lower packaging shell 2, and an electrical connection is formed by welding the pin structure to an external circuit board.

[0048] Furthermore, the capacitor body includes a stacked aluminum wire structure 3 and a conductive plate, such as Figures 3-4 As shown, the conductive plate includes an anode conductive plate 4 and a cathode conductive plate 2 arranged vertically, the stacked aluminum wire structure 3 is provided with an anode region and a cathode region, the anode region of the stacked aluminum wire structure 3 is welded to the anode conductive plate 4, and the cathode region of the stacked aluminum wire structure 3 is bonded to the cathode conductive plate 2.

[0049] The stacked aluminum wire structure 3 is composed of one or more stacked aluminum wire units, and each stacked aluminum wire unit is provided with an anode region and a cathode region at the same position.

[0050] Specifically, in this embodiment, the stacked aluminum wire structure 3 is composed of a first stacked aluminum wire unit 31 and a second stacked aluminum wire unit 32, and the first stacked aluminum wire unit 31 and the second stacked aluminum wire unit 32 are respectively placed on the front and back sides of the conductive plate to form a sandwich structure with the conductive plate.

[0051] Furthermore, the anode regions of the first stacked aluminum wire unit 31 and the second stacked aluminum wire unit 32 are respectively welded to the front and back surfaces of the anode conductive plate 4, and the cathode regions of the first stacked aluminum wire unit 31 and the second stacked aluminum wire unit 32 are respectively bonded and fixed to the front and back surfaces of the cathode conductive plate 2.

[0052] Furthermore, the pin structure includes an anode pin 42 and a cathode pin 24 , wherein the anode pin 42 is led out from the anode conductive plate 4 , and the cathode pin 24 is led out from the cathode conductive plate 2 .

[0053] Specifically, the anode conductive plate 4 includes a sheet-shaped common anode area 41 and an anode pin 42 extending from the middle of the upper end of the common anode area 41 to the lower packaging shell 2, and the anode areas of the first stacked aluminum wire unit 31 and the second stacked aluminum wire unit 32 are respectively welded to the front and back surfaces of the common anode area 41.

[0054] Furthermore, the anode pin 42 passes through the lower packaging shell 2 and then bends toward the inside of the capacitor to be welded to the external circuit board.

[0055] Specifically, the cathode conductive plate 2 includes a sheet-shaped common cathode area 21 and a cathode pin 24 extending from the lower middle of the common cathode area 21 to the downward packaging shell 2. The cathode areas of the first stacked aluminum wire unit 31 and the second stacked aluminum wire unit 32 are respectively bonded to the front and back surfaces of the common cathode area 21. The cathode pin 24 passes through the packaging shell 2 and then bends toward the inside of the capacitor and is welded to the external circuit board.

[0056] Furthermore, the cathode conductive plate 2 further includes a fixing foot structure, which is used to assist the stacked aluminum wire structure 3 in preventing the stacked aluminum wire structure 3 from loosening. The fixing foot structure includes a first fixing foot 22 and a second fixing foot 23 provided on the front and back sides of the common cathode region 21, and the first fixing foot 22 and the second fixing foot 23 are side L-shaped fixing feet.

[0057] Specifically, the first fixing foot 22 is led out from one side of the common cathode region 21, extends toward the front side of the common cathode region 21, and then bends toward the other side of the lead-out side, and is used to fix the first stacked aluminum wire unit 31 on the front side of the common cathode region 324; the second fixing foot 23 is led out from the side corresponding to the lead-out side of the first fixing foot 22, extends toward the back side of the common cathode region 21, and then bends toward the lead-out side of the first fixing foot 22, and is used to fix the second stacked aluminum wire unit 32 on the back side of the common cathode region 324. Thus, the first fixing foot 22 and the second fixing foot 23 simultaneously fix the first stacked aluminum wire unit 31 and the second stacked aluminum wire unit 32 on the front and back sides of the common cathode region 21, effectively improving the vibration resistance of the overall structure.

[0058] Furthermore, in this embodiment, the first stacked aluminum wire unit 31 and the second stacked aluminum wire unit 32 have the same structure, both comprising a plurality of parallel aluminum wires 301, the aluminum wires 301 are divided into a plurality of layers and sequentially stacked in parallel, and each layer is laterally arranged with an equal number of aluminum wires 301. The first stacked aluminum wire unit 31 and the second stacked aluminum wire unit 32 are each provided with 2 layers of aluminum wires 301, and each layer is provided with 13 aluminum wires 301 arranged laterally side by side.

[0059] Furthermore, each aluminum wire 301 is provided with an anode region and a cathode region at the same position, the anode regions of each layer of aluminum wire 301 and the anode regions of the aluminum wire 301 and the common anode region 41 are welded to each other, and the cathode regions of each layer of aluminum wire 301 and the cathode regions of the aluminum wire 301 and the common cathode region 21 are bonded to each other.

[0060] Further, such as Figures 5-6 As shown, the aluminum wire 301 is provided with an insulating adhesive layer 3012, and the anode area and the cathode area of ​​the aluminum wire 301 are distinguished by the insulating adhesive layer 3012. Specifically, after the insulating adhesive layer 3012 is coated on the middle and upper sections of the aluminum wire 301, the shorter end of the aluminum wire 301 is the anode area, and the longer end is the cathode area. The anode area and the cathode area of ​​each aluminum wire 301 have the same position and size. Further, except for the part where the anode area of ​​the aluminum wire 301 is welded to the common anode area 41, the remaining surface of the anode area of ​​the aluminum wire 301 except the welding position is coated with an insulating coating 3011. Further, the cathode area of ​​the aluminum wire 301 is provided with a conductive polymer layer 3013, a graphite layer 3014 and a silver paste layer 3015 in sequence from the inside to the outside, and finally the cathode area of ​​the aluminum wire 301 is pasted on the common cathode area 21 through a silver paste layer 3016.

[0061] Furthermore, the anode area of ​​the stacked aluminum wire structure 3 is also covered with an insulating tape 5 to assist in fixing the stacked aluminum wire structure 3 and prevent the anode welding part from loosening during use.

[0062] The present embodiment provides an aluminum wire polymer capacitor, and the preparation method thereof comprises the following steps:

[0063] S1. Prepare aluminum wire 301. Heat an aluminum ingot with a purity of ≥99.7% to a molten state and convert it into liquid aluminum. Then, use a die-casting method to inject the liquid aluminum into a preset mold. After it cools and solidifies, a cylindrical aluminum billet is obtained. The aluminum billet is reheated to a suitable temperature and gradually thinned through a stretching process to form a linear aluminum wire. The diameter of the linear aluminum wire is 1mm to 3mm. The linear aluminum wire is cut into aluminum wire 301 with a length of 6.0 to 7.0mm. The prepared aluminum wire 301 is cleaned and chemically etched to form porous holes on its surface. It is then chemically treated again to form a layer of aluminum oxide film, which increases the effective area of ​​the aluminum wire and its ability to store charge, thereby increasing its capacity.

[0064] S2. Evenly apply a layer of insulating glue at a height of 5.0 mm to 5.2 mm at one end of the high-purity aluminum wire 301 to form an insulating glue layer 3012, so that the long end of the high-purity aluminum wire 301 is the cathode region and the short end is the anode region;

[0065] S3, placing the cathode region of the high-purity aluminum wire 301 in a conductive polymer material, forming a uniform conductive polymer layer 3013 on the cathode region of the aluminum wire 301, placing the cathode region of the aluminum wire 301 covered with the conductive polymer layer 3013 in graphite and silver paste in sequence, and forming a graphite layer 3014 and a silver paste layer 3015 on the surface of the cathode region in sequence;

[0066] S4, aligning the anode regions and cathode regions of the three aluminum wires and arranging them side by side horizontally to form a single layer of aluminum wire 301, stacking two layers of aluminum wire 301 on the front and back sides of the common anode region 41 and the common cathode region 21 in sequence, bonding the cathode regions of the aluminum wires 301 of each layer and the cathode regions of the aluminum wires 301 to the common cathode region 21 through a silver paste layer 3016, and welding and fixing the anode regions of the aluminum wires 301 of each layer and the anode regions of the aluminum wires 301 to the common anode region 41;

[0067] S5, winding the insulating tape 5 around the outer sides of the stacked aluminum wire structure 3 on the front and back sides of the common anode region 41, further fixing the stacked aluminum wire structure 3, and filling the insulating coating 3011 in the gap between the insulating tape 5 and the anode region of the stacked aluminum wire structure 3 to form a capacitor body;

[0068] S6. Finally, the capacitor body is packaged in the upper package shell 1 and the lower package shell 2 using packaging technology, and the anode pin 42 and the cathode pin 24 are respectively led out from the lower package shell 2 by the upper end of the anode conductive plate 4 and the lower end of the cathode conductive plate 2.

[0069] Example 2

[0070] This embodiment provides an aluminum wire type polymer capacitor, which is different from the first embodiment only in that when each layer of aluminum wires 301 of the first stacked aluminum wire unit 31 and the second stacked aluminum wire unit 32 are arranged horizontally, a heat dissipation spacing is reserved between the aluminum wires 301, and the heat dissipation spacing is 0.2 mm to 0.4 mm.

[0071] In order to realize the above structure, the preparation method of the aluminum wire type polymer capacitor of this embodiment is different from S4 to S5 in the preparation method of Example 1 in that: one aluminum wire 301 of each of the upper and lower layers is taken to form a group, the cathode areas of the aluminum wires 301 in each group are bonded to each other through the silver paste layer 3016, and the anode areas of the aluminum wires 301 in each group are welded and fixed; each group of aluminum wires 301 is separated by the heat dissipation spacing, and the cathode area of ​​each group of aluminum wires 301 and the common cathode area 21 are bonded to each other through the silver paste layer 3016, and the insulating tape 5 is used to start from the junction area of ​​the insulating adhesive layer 3012 and the anode area, and each group of aluminum wires 301 on the front and back sides are separated and wound with uniform tension, and a welding area is reserved during winding, and then the anode area of ​​each group of aluminum wires 301 and the common anode area 41 are welded and fixed to each other, wherein the gap between the insulating tape 5 and the anode area of ​​the aluminum wire 301 is filled with the insulating coating 3011.

[0072] In this step, because reserving a heat dissipation spacing may increase the difficulty of welding, the method of crimping and then welding is used to increase the stability of welding, so that the parallel connection mainly depends on the connection of the aluminum wire in the anode area and the cathode area. The distance is not too large and the aluminum wire has good fixation, which will not directly affect the parallel connection between the aluminum wires.

[0073] Example 3

[0074] This embodiment provides an aluminum wire type polymer capacitor, which differs from the first embodiment only in that the first stacked aluminum wire unit 31 and the second stacked aluminum wire unit 32 on the front and back sides of the common cathode region 21 and the common anode region 41 are each provided with four layers of aluminum wires 301, and two aluminum wires 301 are arranged side by side in each layer.

[0075] Example 4

[0076] This embodiment provides an aluminum wire type polymer capacitor, which differs from the first embodiment only in that the first stacked aluminum wire unit 31 and the second stacked aluminum wire unit 32 on the front and back sides of the common cathode region 21 and the common anode region 41 are each provided with a layer of aluminum wire 301 , and four aluminum wires 301 are arranged side by side in each layer.

[0077] Example 5

[0078] This embodiment provides an aluminum wire type polymer capacitor, which is different from the first embodiment in that only the first stacked aluminum wire unit 31 is provided on the front of the common cathode region 21 and the common anode region 41, and the first stacked aluminum wire unit 31 is provided with two layers of aluminum wires 301, and each layer is provided with 13 aluminum wires 301 arranged side by side. The fixing foot structure in this embodiment is provided with only the first fixing foot 22 on the front of the common cathode region 21, which is used to wrap and fix the first stacked aluminum wire unit 31.

[0079] Example 6

[0080] This embodiment provides an aluminum wire polymer capacitor, such as Figures 7-8 As shown, the difference from Example 1 is that a first stacked aluminum wire unit 31, a third stacked aluminum wire unit 33 and a fifth stacked aluminum wire unit 35 are provided on the front side of the common cathode region 21 and the common anode region 41, and a second stacked aluminum wire unit 32, a fourth stacked aluminum wire unit 34 and a sixth stacked aluminum wire unit 36 ​​are provided on the back side of the common cathode region 21 and the common anode region 41, and each of the stacked aluminum wire units is provided with 2 layers of aluminum wires 301, and each layer has 13 aluminum wires 301 arranged side by side in a transverse direction.

[0081] The first fixing foot 22 is led out from one side of the common cathode area 21, extends toward the front side of the common cathode area 21, and then bends toward the other side of the lead-out side, wrapping and fixing the first stacked aluminum wire unit 31, the third stacked aluminum wire unit 33, and the fifth stacked aluminum wire unit 35 on the front side of the common cathode area 324; the second fixing foot 23 is led out from the side corresponding to the lead-out side of the first fixing foot 22, extends toward the back side of the common cathode area 21, and then bends toward the lead-out side of the first fixing foot 22, wrapping and fixing the second stacked aluminum wire unit 32, the fourth stacked aluminum wire unit 34, and the sixth stacked aluminum wire unit 36 ​​on the back side of the common cathode area 324.

[0082] Under the same material, the capacitance increases mainly according to the increase of the total electrode area, that is, the total area of ​​the aluminum wire. As the stacked aluminum wire unit increases, more current paths can also be provided, thereby reducing the current density on each path and reducing resistance. Therefore, the more stacked aluminum wire units there are, the larger the capacity of the capacitor and the lower the ESR. Compared with the structure in which the same number of layers of aluminum wire are arranged as a single stacked aluminum wire unit, the structure in which multiple stacked aluminum wire units are stacked in this embodiment is more stable, and when impacted, the connection point between the aluminum wire and the common anode area is not easy to break.

[0083] Table 1: Configuration of stacked aluminum wire units in Examples 1 to 6

[0084]

[0085] Comparative Example 1

[0086] This comparative example proposes an aluminum foil polymer multilayer capacitor, which differs from the aluminum wire type polymer capacitor of Example 1 in that conventional aluminum foil is used to replace the single-layer parallel aluminum wire 301 in Example 1.

[0087] The preparation method of the aluminum foil polymer stacked capacitor provided in this comparative example includes the following steps: four pieces of aluminum foil are integrated into one unit by connecting the anodes in parallel and the cathodes in parallel, and the length and width of each piece of aluminum foil are set to be the same as the length and width of three aluminum wires in each layer in Example 1, and conductive pins are respectively led out from the common anode and cathode ends. After the assembly is completed, the entire stacked semi-finished capacitor is transformed into a rectangular capacitor using packaging technology.

[0088] Comparative Example 2

[0089] This comparative example proposes an aluminum wire type polymer capacitor, which differs from Example 2 only in that when each layer of aluminum wires 301 of the first stacked aluminum wire unit 31 and the second stacked aluminum wire unit 32 are arranged horizontally, a heat dissipation spacing is reserved between the aluminum wires 301, and the heat dissipation spacing is 0.5 mm.

[0090] 100 capacitors of Examples 1 to 6 and Comparative Examples 1 to 2 were tested, and the performance test results are shown in Table 2 below:

[0091] Table 2: Performance test results of capacitors prepared by the methods described in Examples 1 to 6 and Comparative Examples 1 to 2

[0092] plan Capacitance(μF) Initial ESR(mΩ) ESR after reflow (mΩ) Leakage current qualified rate (%) Example 1 581.0 3.4 3.9 70％ Example 2 573.6 3.8 4.5 75％ Example 3 614.3 3.5 4.0 68％ Example 4 528.8 4.0 4.2 74％ Example 5 593.3 3.5 3.9 78％ Example 6 866.4 3.2 3.6 70％ Comparative Example 1 420.1 4.7 5.4 65％ Comparative Example 2 568.5 4.6 5.2 69％

[0093] From the test data in Table 2, it can be seen that the aluminum wire polymer capacitors prepared by the methods of Examples 1 to 6 have significantly improved capacitance and significantly reduced ESR compared to the multilayer capacitors prepared by the existing method in Comparative Example 1. Due to the provision of a heat dissipation gap, the leakage current qualified rate of Example 2 is significantly improved compared to Example 1. Compared to Example 2, Comparative Example 2 further increases the heat dissipation gap to 0.5 mm. Although the heat dissipation of the capacitor can be enhanced, the ESR increases at the same time, and the seismic resistance of the entire structure is also reduced.

[0094] Obviously, the embodiments described above are only some embodiments of the present application, rather than all embodiments. The preferred embodiments of the present application are given in the accompanying drawings, but they do not limit the patent scope of the present application. The present application can be implemented in many different forms. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present application more thorough and comprehensive. Although the present application is described in detail with reference to the aforementioned embodiments, for those skilled in the art, it is still possible to modify the technical solutions recorded in the aforementioned specific implementation methods, or to perform equivalent replacement of some of the technical features therein. Any equivalent structure made using the contents of the specification and drawings of this application, directly or indirectly used in other related technical fields, is similarly within the scope of patent protection of this application.

Claims

1. An aluminum wire type polymer capacitor, characterized in that: It comprises a housing (1) and a capacitor body; The capacitor body comprises a stacked aluminum wire structure (3) and a conductive plate, the conductive plate comprises an anode conductive plate (4) and a cathode conductive plate (2), the stacked aluminum wire structure (3) is provided with an anode region and a cathode region, the anode region of the stacked aluminum wire structure (3) is fixedly connected to the anode conductive plate (4), and the cathode region of the stacked aluminum wire structure (3) is fixedly connected to the cathode conductive plate (2); The stacked aluminum wire structure (3) is composed of more than one stacked aluminum wire unit; the stacked aluminum wire unit is composed of a plurality of parallel-connected aluminum wires (301).

2. The aluminum wire type polymer capacitor according to claim 1, characterized in that: The stacked aluminum wire structure (3) is composed of a plurality of stacked aluminum wire units, which are arranged on the front and back sides of the conductive plate, and the number of stacked aluminum wire units on the front and back sides of the conductive plate is the same.

3. The aluminum wire type polymer capacitor according to claim 2, characterized in that: The stacked aluminum wire structure (3) consists of a first stacked aluminum wire unit (31) and a second stacked aluminum wire unit (32); the first stacked aluminum wire unit (31) and the second stacked aluminum wire unit (32) are arranged on the front and back sides of the conductive plate to form a sandwich structure with the conductive plate.

4. The aluminum wire type polymer capacitor according to claim 2, characterized in that: The stacked aluminum wire unit is composed of more than one layer of parallel aluminum wires (301), and each layer of aluminum wires (301) is arranged horizontally.

5. The aluminum wire type polymer capacitor according to claim 4, characterized in that: The number of layers and arrangement of the aluminum wires (301) provided in each of the stacked aluminum wire units are the same.

6. The aluminum wire type polymer capacitor according to claim 4, characterized in that: When each layer of aluminum wires (301) is arranged horizontally, a heat dissipation spacing is reserved between the aluminum wires (301), and the heat dissipation spacing is 0.2 mm to 0.4 mm.

7. The aluminum wire type polymer capacitor according to claim 1, characterized in that: The aluminum purity of the aluminum wire (301) is ≥99.7%, and the diameter of the aluminum wire (301) is 1 mm to 3 mm.

8. The aluminum wire type polymer capacitor according to claim 2, characterized in that: The conductive plate comprises an anode conductive plate (4) and a cathode conductive plate (2) arranged vertically, the stacked aluminum wire unit is provided with an anode region and a cathode region, the anode region of the stacked aluminum wire unit is welded to the anode conductive plate (4), and the cathode region of the stacked aluminum wire unit is bonded and fixed to the cathode conductive plate (2).

9. The aluminum wire type polymer capacitor according to claim 1, characterized in that: The cathode region of the aluminum wire (301) is provided with a conductive polymer layer (3013), a graphite layer (3014) and a silver paste layer (3015) in sequence from the inside to the outside.

10. A method for preparing an aluminum wire polymer capacitor, characterized in that: The following steps are involved: S1, preparing aluminum wires (301) and applying insulating glue at the same height of each aluminum wire (301) to form an insulating glue layer (3012), distinguishing the long end of the aluminum wire (301) as the cathode region and the short end as the anode region; S2, forming a conductive polymer layer (3013), a graphite layer (3014) and a silver paste layer (3015) in sequence in the cathode region of the aluminum wire (301); S3, aligning the anode regions and cathode regions of a plurality of aluminum wires (301) and arranging them side by side horizontally to form a single layer of aluminum wires (301), and then stacking multiple layers of aluminum wires (301) on the front and back sides of the conductive plate in sequence to form a stacked aluminum wire unit, wherein the cathode regions of each layer of aluminum wires (301) and the cathode regions of the aluminum wires (301) and the common cathode region (21) are bonded to each other through a silver paste layer (3016), and the anode regions of each layer of aluminum wires (301) and the anode regions of the aluminum wires (301) and the common anode region (41) are welded and fixed to each other; S4, winding the insulating tape (5) around the outer sides of the stacked aluminum wire units on the front and back sides of the common anode region (41), and filling the gap between the insulating tape (5) and the anode region of the stacked aluminum wire units with the insulating coating (3011), so as to form a capacitor body; S5. Encapsulate the capacitor body.

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