Laminated aluminum capacitor and preparation method thereof

Abstract

The invention discloses a laminated aluminum capacitor and a preparation method thereof, the capacitor comprises a plurality of single sheets, gaskets, interlayers A, interlayers B and an outer layer, the single sheets are sequentially laminated to obtain a core, the interlayers A are arranged on the single sheets, the gaskets and the interlayers B are arranged between the adjacent single sheets, and the outer layer is connected with the outer surface of the core. According to the capacitor provided by the invention, a plurality of single chips form an integral core in the earlier stage of preparation, so that the integral core is not easy to damage during process circulation, and the yield of final finished products can be improved. A plurality of single chips are treated as a whole, an operator only needs to treat one whole instead of a plurality of independent single chips in the production and manufacturing process, and the whole core can be welded on the positive electrode lead in the bonding step, so that the operation difficulty is greatly reduced, the production efficiency is improved, and the manufacturing method of the pre-laminated capacitor has the advantages that the production cost is reduced, and the production efficiency is improved. The anti-stress capability is strong, the damage to the capacitor caused by stress during the single-layer preparation of the traditional laminated capacitor is avoided, and the leakage current of the capacitor is low.

Description

Technical Field

[0001] The invention belongs to the technical field of capacitors, and in particular relates to a laminated aluminum capacitor and a preparation method thereof. Background Art

[0002] In the existing manufacturing process of multilayer capacitors, there are many production steps from single chip to monomer. The single chip is relatively fragile and is easily damaged by collision during production and transportation and manufacturing. The defective monomer directly affects the defective core assembly later. Therefore, a capacitor and a manufacturing method that can solve the above problems are needed.

[0003] Patent document with announcement number CN112820546A discloses a capacitor, a multilayer capacitor and a method for manufacturing a multilayer capacitor. The manufacturing process of the patent is as follows: Figure 3 As shown. In this patent, a core group requires multiple monomers, and the production cycle is long. During the stacking process of multiple monomers, the conductive gasket at the positive end needs to be welded one by one in advance, and the monomers also need to be welded to the positive lead layer by layer, which leads to slow production efficiency. Because the positive terminal is fixed by laser welding, thermal and mechanical stresses are applied to the product during the welding process, which can easily cause poor LC. Conductive paste is used to connect any two adjacent monomers at the negative end, and finally it is necessary to seal the edges with silver paste or impregnate the entire line with silver paste to ensure uniform coverage of the conductive paste. The process cost and material cost are relatively high. Summary of the invention

[0004] In order to solve the above technical problems, the present invention provides a laminated aluminum capacitor and a preparation method thereof.

[0005] The present invention is achieved through the following technical solutions.

[0006] The present invention provides a laminated aluminum capacitor, comprising a single sheet, a gasket, an interlayer A, an interlayer B and an outer layer. The single sheet is provided with a plurality of pieces and stacked in sequence to obtain a core. The interlayer A is provided on the single sheet, the gasket and the interlayer B are provided between adjacent single sheets, and the outer layer is connected to the outer surface of the core.

[0007] Preferably, a negative terminal is arranged on the single sheet on one side of the barrier A, and a positive terminal is arranged on the single sheet on the other side of the barrier A. The gasket is a positive electrode gasket, which is arranged between the positive terminals of adjacent single sheets, and the outer layer wraps the core.

[0008] Preferably, the width of the partition layer B is consistent with the width of the single sheet, and the length of the partition layer B is 50% to 80% of the length of the negative terminal.

[0009] Preferably, the area of ​​the positive terminal is smaller than the area of ​​the negative terminal.

[0010] Preferably, the outer layer wraps the negative terminal side of the single piece on the core.

[0011] Preferably, the outer layer is a heat shrinkable film.

[0012] Preferably, the use temperature of the heat shrinkable film is 100° C. to 300° C., and the dimensional deformation of the heat shrinkable film does not exceed 10% between 200° C. and 300° C., and the heat shrinkable film has a fixed dimensional shrinkage ratio.

[0013] Preferably, the shrinkage start temperature of the heat shrinkable film is 260°C to 300°C.

[0014] Preferably, the heat shrinkable film is a porous heat shrinkable film, and the holes on the heat shrinkable film are prepared by laser dotting or mold punching.

[0015] Preferably, the partition layer A is an isolation rubber layer, and the partition layer B is a capacitor partition paper.

[0016] A method for preparing a laminated aluminum capacitor comprises the following steps:

[0017] S1: cutting the initial material into single pieces of preset size;

[0018] S2: coating and setting a partition layer A on the single chip, where the partition layer A divides the single chip into a positive terminal and a negative terminal;

[0019] S3: Pre-stack multiple single sheets using gaskets, set a gasket between the positive ends of any two adjacent single sheets to form a connection, set an interlayer B between the negative ends of any two adjacent single sheets to form a connection, and complete the stacking of multiple single sheets to obtain a core;

[0020] S4: Use the outer layer to wrap the negative end of the core;

[0021] S5: preparing a conductive polymer layer, a graphite layer and a conductive silver layer on the negative terminal of the core, and then packaging the core to complete the preparation of the laminated aluminum capacitor.

[0022] The beneficial effects of the present invention are:

[0023] The capacitor of the present invention combines multiple single pieces into an integral core in the early stage of preparation, which increases firmness and is not easily damaged during process flow. The core can withstand a certain force, and its anti-seismic performance is higher than that of a single single piece, which can improve the yield of the final product. Multiple single pieces are treated as a whole, so in the entire production process, the operator only needs to handle one whole, rather than multiple independent single pieces. In the bonding step of capacitor preparation, the entire core can be welded to the positive lead, which greatly reduces the difficulty of operation and improves production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the structure of the present invention;

[0025] Figure 2 It is a preparation flow chart of the present invention;

[0026] Figure 3 It is the preparation flow chart of patent document with announcement number CN112820546A;

[0027] In the figure: 1-single piece, 11-negative terminal, 12-positive terminal, 2-gasket, 3-interlayer A, 4-interlayer B, 5-outer layer. DETAILED DESCRIPTION

[0028] The technical solution of the present invention is further described below, but the scope of protection claimed is not limited to the description.

[0029] Embodiment 1:

[0030] like Figure 1 , 2 As shown, a laminated aluminum capacitor includes a single sheet 1, a gasket 2, a barrier layer A3, a barrier layer B4 and an outer layer 5. The single sheet 1 is provided with a plurality of pieces and stacked in sequence to obtain a core. The barrier layer A3 is provided on the single sheet 1, the gasket 2 and the barrier layer B4 are provided between adjacent single sheets 1, and the outer layer 5 is connected to the outer surface of the core.

[0031] A negative terminal 11 is arranged on the single sheet 1 on one side of the interlayer A3, and a positive terminal 12 is arranged on the single sheet 1 on the other side of the interlayer A3. The gasket 2 is a positive electrode gasket, and the positive electrode gasket is made of aluminum or the same material as the positive terminal of the single sheet. The gasket 2 is arranged between the positive terminals 12 of adjacent single sheets 1, and the outer layer 5 wraps the core arrangement.

[0032] The width of the interlayer B4 is consistent with the width of the single piece 1, and the length of the interlayer B4 is 50% to 80% of the length of the negative terminal 11, and specifically 70% in this embodiment. The interlayer B4 can make the subsequent impregnation liquid penetrate better, which is helpful for the extraction of capacity.

[0033] The outer layer 5 wraps around the negative terminal 11 side of the single sheet 1 on the core.

[0034] The outer layer 5 is a heat shrinkable film made of PTFE polytetrafluoroethylene material.

[0035] The use temperature of the heat shrink film is 100°C to 300°C, and the dimensional deformation of the heat shrink film does not exceed 10% between 200°C and 300°C. The heat shrink film has a fixed dimensional shrinkage ratio, and will not shrink after reaching the estimated size, thereby avoiding the spread of one side of the cathode end 11 in the core, improving the impact resistance during the molding process, and not easily deforming during the packaging process. The initial shrinkage temperature of the heat shrink film is 260°C to 300°C, thereby avoiding further shrinkage of the heat shrink film during product processing, thereby avoiding damage to the product.

[0036] The heat shrinkable film is a porous heat shrinkable film, and the holes on the heat shrinkable film are prepared by laser dotting or mold punching.

[0037] The interlayer A3 is an acrylic silicon isolation adhesive layer, and the thickness of the interlayer A3 is set to 5-15 microns as required. The interlayer B4 is a capacitor separator paper.

[0038] A method for preparing a laminated aluminum capacitor comprises the following steps:

[0039] S1: cutting the initial material into single pieces 1 of a preset size;

[0040] S2: coating and setting an interlayer A3 at a preset position of the single sheet 1, the interlayer A3 dividing the single sheet 1 into a positive terminal 12 and a negative terminal 11, and visually checking that the isolation glue line is continuous without obvious breakpoints when coating the interlayer A3;

[0041] S3: Pre-stack multiple single sheets 1 using gaskets 2, set gaskets 2 between positive terminals 12 of any two adjacent single sheets 1 to form a connection, set interlayer B4 between negative terminals 11 of any two adjacent single sheets 1 to form a connection, and complete stacking of multiple single sheets 1 to obtain a core;

[0042] S4: Wrap one side of the negative terminal 11 on the core with the outer layer 5;

[0043] S5: preparing a conductive polymer layer, a graphite layer and a conductive silver layer on the negative terminal 11 of the core, and then packaging the core to complete the preparation of the laminated aluminum capacitor.

[0044] Comparative Example 1:

[0045] 35V-47 laminated aluminum capacitor prepared using existing technology.

[0046] The performance of five 35V-47 laminated aluminum capacitors of the same batch prepared in Example 1 and Comparative Example 1 was tested, and the results are shown below.

[0047] Table 1 Performance test table of 35V-47 laminated aluminum capacitor of Example 1

[0048]

[0049] Table 2 Performance test table of 35V-47 laminated aluminum capacitor of comparative example 1

[0050]

[0051] It can be seen from Table 1 and Table 2 that the preparation method of the present application can improve production efficiency while reducing stress damage in the traditional multilayer capacitor preparation process. The prepared capacitor has a low leakage current and is suitable for large-scale production.

Claims

1. A laminated aluminum capacitor, characterized in that: The invention comprises a single sheet (1), a gasket (2), an interlayer A (3), an interlayer B (4) and an outer layer (5); the single sheet (1) is provided with a plurality of pieces and stacked in sequence to obtain a core; the interlayer A (3) is provided on the single sheet (1); the gasket (2) and the interlayer B (4) are provided between adjacent single sheets (1); and the outer layer (5) is connected to the outer surface of the core.

2. A laminated aluminum capacitor as claimed in claim 1, characterized in that: A negative terminal (11) is arranged on the single sheet (1) on one side of the interlayer A (3), and a positive terminal (12) is arranged on the single sheet (1) on the other side of the interlayer A (3); the gasket (2) is a positive electrode gasket, and the gasket (2) is arranged between the positive terminals (12) of adjacent single sheets (1), and the outer layer (5) wraps the core arrangement.

3. A laminated aluminum capacitor as claimed in claim 2, characterized in that: The width of the partition layer B (4) is consistent with the width of the single sheet (1), and the length of the partition layer B (4) is 50% to 80% of the length of the negative terminal (11).

4. A laminated aluminum capacitor as claimed in claim 2, characterized in that: The area of ​​the positive terminal (12) is smaller than the area of ​​the negative terminal (11).

5. A laminated aluminum capacitor as claimed in claim 2, characterized in that: The outer layer (5) wraps around the negative terminal (11) side of the single sheet (1) on the core.

6. A laminated aluminum capacitor as claimed in claim 1, characterized in that: The outer layer (5) is a heat shrinkable film.

7. A laminated aluminum capacitor as claimed in claim 6, characterized in that: The use temperature of the heat shrinkable film is 100° C. to 300° C., and the dimensional deformation of the heat shrinkable film does not exceed 10% between 200° C. and 300° C. The heat shrinkable film has a fixed dimensional shrinkage ratio.

8. A laminated aluminum capacitor as claimed in claim 6, characterized in that: The heat shrinkable film is a porous heat shrinkable film, and the holes on the heat shrinkable film are prepared by laser dotting or mold punching.

9. A laminated aluminum capacitor as claimed in claim 1, characterized in that: The interlayer A (3) is an isolation rubber layer, and the interlayer B (4) is a capacitor interlayer paper.

10. A method for preparing a laminated aluminum capacitor according to any one of claims 1 to 9, characterized in that: The following steps are involved: S1: cutting the initial material into single pieces of a preset size (1); S2: coating and setting an interlayer A (3) on the single sheet (1), wherein the interlayer A (3) divides the single sheet (1) into a positive terminal (12) and a negative terminal (11); S3: pre-stack a plurality of single sheets (1) using a gasket (2), arrange a gasket (2) between the positive terminals (12) of any two adjacent single sheets (1) to form a connection, arrange an interlayer B (4) between the negative terminals (11) of any two adjacent single sheets (1) to form a connection, and complete the stacking of the plurality of single sheets (1) to obtain a core; S4: using the outer layer (5) to wrap the negative terminal (11) side of the core; S5: preparing a conductive polymer layer, a graphite layer and a conductive silver layer on the negative terminal (11) of the core, and then packaging the core to complete the preparation of the laminated aluminum capacitor.

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