Laminated liquid aluminum electrolytic capacitor

Abstract

The utility model provides a laminated liquid aluminum electrolytic capacitor. The aluminum electrolytic capacitor comprises an aluminum shell, a positive pole, a negative pole, a pressure release valve and a laminated structure core bag, wherein the laminated structure core cladding is located in the laminated liquid aluminum electrolytic capacitor; the secondary core package with the laminated structure comprises anode foil / cathode foil, electrolytic paper, a plurality of layers of anode tabs, a plurality of layers of cathode tabs and a high-temperature adhesive tape which are alternately laminated, each of the plurality of layers of anode tabs is connected with the anode foil in the alternately laminated anode foil / cathode foil, and each of the plurality of layers of cathode tabs is connected with the high-temperature adhesive tape; each tab in the multiple layers of cathode tabs is respectively connected with the cathode foil in the alternately stacked anode foil / cathode foil, and the electrolytic paper is positioned between the alternately stacked anode foil and cathode foil. The laminated liquid aluminum electrolytic capacitor provided by the embodiment of the utility model is high in capacity, low in internal resistance and small in loss.

Description

Technical Field

[0001] This utility model relates to the field of aluminum electrolytic capacitors, and specifically to a multilayer liquid aluminum electrolytic capacitor. Background Technology

[0002] To save space on circuit boards and reduce the size of integrated circuit boards, it is necessary to develop square aluminum electrolytic capacitors. Commercially available square aluminum electrolytic capacitors generally adopt a flat structure, including a square aluminum shell, a flat, oval-shaped capacitor core, an insulating plug, and an aluminum shell cover. The aluminum shell cover and the insulating plug are designed separately. The aluminum shell cover seals the insulating plug and the core inside the square aluminum shell, and the aluminum shell cover and the square aluminum shell are sealed by laser welding. An explosion-proof valve is usually designed into the aluminum shell or cover. The core of this structure is usually wound. Because the number of leads is generally no more than four pairs, the aluminum electrolytic capacitor is relatively large, has a low specific capacitance, and a high internal resistance. During instantaneous high-current charging and discharging, the leads may melt due to high temperature, failing to meet the requirements for withstanding high ripple current. Moreover, once the explosion-proof valve is opened, the electrolyte inside the aluminum electrolytic capacitor will leak, which will not only cause the aluminum electrolytic capacitor to fail rapidly but also pose a safety hazard to the integrated circuit board. Utility Model Content

[0003] To address the problems of existing commercially available square liquid aluminum electrolytic capacitors, such as large size, low specific capacitance, high internal resistance, insufficient ripple current withstand capability, rapid product failure after the explosion-proof valve is opened, and safety hazards, this utility model provides a compact, high-specific-capacitance, low-internal-resistance, high-ripple-current withstand capability, long service life, and good safety multilayer liquid aluminum electrolytic capacitor.

[0004] On the one hand, this utility model provides a multilayer liquid aluminum electrolytic capacitor 5, including an aluminum shell 51, a positive electrode post 52, a negative electrode post 53, a pressure relief valve 54, and a multilayer core package 4;

[0005] Among them, the laminated core package 4 is located inside the aluminum shell 51, and the pressure relief valve 54 is located on the top of the aluminum shell 51;

[0006] The stacked core package 4 includes multiple anode tabs 33 and multiple cathode tabs 34; the multiple anode tabs 33 are located on the upper left side of the stacked core package 4; the multiple cathode tabs 34 are located on the upper right side of the stacked core package 4.

[0007] The positive electrode post 52 passes through the aluminum shell 51 and is connected to the multi-layer anode tab 33 of the laminated core package 4;

[0008] The negative electrode post 53 passes through the aluminum shell 51 and is connected to the multi-layer cathode tab 34 of the laminated core package 4;

[0009] The stacked core package 4 is formed by binding multiple stacked sub-core packages 3 together with high-temperature adhesive tape 35.

[0010] The multilayer sub-core package 3 includes alternating layers of anode / cathode foil 31, electrolytic paper 32, multilayer anode tabs 33, multilayer cathode tabs 34, and high-temperature tape 35. Each tab in the multilayer anode tabs 33 is connected to the anode foil in the alternating layers of anode / cathode foil 31, and each tab in the multilayer cathode tabs 34 is connected to the cathode foil in the alternating layers of anode / cathode foil 31. The electrolytic paper 32 is located between the alternating layers of anode and cathode foil.

[0011] The multilayered sub-core package 3 is composed of alternating layers of anode foil 1, cathode foil 2 and electrolytic paper 32.

[0012] The anode foil 1 includes an anode tab 11 and a laminated foil 12. The core aluminum foil of the anode tab 11 and the laminated foil 12 are connected to form an integrated structure. The anode tab 11 is located at the upper left of the laminated foil 12.

[0013] The cathode foil 2 includes a cathode tab 21 and a current collector 22. The cathode tab 21 and the current collector 22 are connected to form an integrated structure. The cathode tab 21 is located to the upper right of the current collector 22.

[0014] In some embodiments of this utility model, the foils of the starting and ending stacks of the secondary core package 3 in the stacked structure are both cathode foils 2.

[0015] In some embodiments of this utility model, the layered structure secondary core package 3 is formed by alternating layers of N anode foils 1, N+1 cathode foils 2, and 2N electrolytic paper sheets 32; wherein N is an integer from 1 to 100. Specifically, N is 40, 45, 50, 55, 60, 65, 70, 75, or any value within the above range.

[0016] In some embodiments of this utility model, high-temperature tape 35 is distributed around the sub-core package 3 of the laminated structure.

[0017] In this invention, the layered sub-core package 3, after being fixed by high-temperature tape 35, will not spontaneously disperse.

[0018] In some embodiments of this utility model, the length L2 of the anode tab 11 is 30mm-80mm. Specifically, the length L2 of the anode tab 11 is 30mm, 40mm, 50mm, 60mm, 70mm, 80mm or any value within the above range.

[0019] In some embodiments of this utility model, the width W2 of the anode tab 11 is 5mm-20mm. Specifically, the width W2 of the anode tab 11 is 5mm, 10mm, 15mm, 20mm or any value within the above range.

[0020] In some embodiments of this utility model, the protective width W3 of the anode tab 11 is 3mm-15mm. Specifically, the protective width W3 of the anode tab 11 is 3mm, 5mm, 8mm, 10mm, 12mm, 15mm or any value within the above range.

[0021] In some embodiments of this utility model, the length L1 of the laminated foil 12 is 50mm-200mm. Specifically, the length L1 of the laminated foil 12 is 50mm, 60mm, 70mm, 80mm, 90mm, 100mm, 110mm, 120mm, 130mm, 140mm, 150mm, 160mm, 170mm, 180mm, 190mm, 200mm or any value within the above range.

[0022] In some embodiments of this utility model, the width W1 of the laminated foil 12 is 30mm-100mm. Specifically, the width W1 of the laminated foil 12 is 30mm, 40mm, 50mm, 60mm, 70mm, 80mm, 90mm, 100mm or any value within the above range.

[0023] In some embodiments of this utility model, the anode tab 11 is made of aluminum foil, and the laminated foil 12 is a "sandwich" structure obtained by sintering high-purity spherical aluminum powder coated on both sides of the core aluminum foil; wherein, the thickness of a single laminated foil 12 is 100μm-200μm; optionally, the rated voltage of the laminated foil 12 is 400V-700V. Specifically, the thickness of a single laminated foil 12 is 100μm, 110μm, 120μm, 130μm, 140μm, 150μm, 160μm, 170μm, 180μm, 190μm, 200μm or any value within the above range; the rated voltage of the laminated foil 12 is 400V, 450V, 500V, 550V, 600V, 650V, 700V or any value within the above range.

[0024] In some embodiments of this utility model, the length L2' of the cathode tab 21 is 30mm-80mm. Specifically, the length L2' of the cathode tab 21 is 30mm, 40mm, 50mm, 60mm, 70mm, 80mm or any value within the above range.

[0025] In some embodiments of this utility model, the width W2' of the cathode tab 21 is 5mm-20mm. Specifically, the width W2' of the cathode tab 21 is 5mm, 10mm, 15mm, 20mm or any value within the above range.

[0026] In some embodiments of this utility model, the protection width W3' of the cathode tab 21 is 3mm-15mm. Specifically, the protection width W3' of the cathode tab 21 is 3mm, 4mm, 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, 11mm, 12mm, 13mm, 14mm, 15mm or any value within the above range.

[0027] In some embodiments of this utility model, the length L1' of the current collector 22 is 50mm-200mm. Specifically, the length L1' of the current collector 22 is 50mm, 60mm, 70mm, 80mm, 90mm, 100mm, 110mm, 120mm, 130mm, 140mm, 150mm, 160mm, 170mm, 180mm, 190mm, 200mm or any value within the above range.

[0028] In some embodiments of this utility model, the width W1' of the current collector 22 is 30mm-100mm. Specifically, the width W1' of the current collector 22 is 30mm, 40mm, 50mm, 60mm, 70mm, 80mm, 90mm, 100mm or any value within the above range.

[0029] In some embodiments of this utility model, the cathode tab 21 is made of aluminum foil, and the current collector 22 is made of aluminum foil; the thickness of a single current collector 22 is 10μm-30μm. Specifically, the thickness of a single current collector 22 is 10μm, 15μm, 20μm, 25μm, 30μm, or any value within the above range.

[0030] In some embodiments of this invention, the thickness of the single electrolytic paper 32 is 25μm-35μm. Specifically, the thickness of the single electrolytic paper 32 is 25μm, 30μm, 35μm, or any value within the above range.

[0031] In some embodiments of this utility model, the length L4 of the laminated secondary core package 3, excluding the upper multi-layer electrode tabs, is 52mm-202mm. Specifically, the length L4 of the laminated secondary core package 3, excluding the upper multi-layer electrode tabs, is 52mm, 60mm, 70mm, 80mm, 90mm, 100mm, 110mm, 120mm, 130mm, 140mm, 150mm, 160mm, 170mm, 180mm, 190mm, 200mm, 202mm, or any value within the above range.

[0032] In some embodiments of this utility model, the width W4 of the sub-core package 3 of the stacked structure is 32mm-102mm. Specifically, the width W4 of the sub-core package 3 of the stacked structure is 32mm, 40mm, 50mm, 60mm, 70mm, 80mm, 90mm, 100mm, 102mm or any value within the above range.

[0033] In some embodiments of this utility model, the length L5 of the laminated core package 4, excluding the upper multi-layer tabs, is 52mm-202mm. Specifically, the length L5 of the laminated core package 4, excluding the upper multi-layer tabs, is 52mm, 60mm, 70mm, 80mm, 90mm, 100mm, 110mm, 120mm, 130mm, 140mm, 150mm, 160mm, 170mm, 180mm, 190mm, 200mm, 202mm, or any value within the above range.

[0034] In some embodiments of this utility model, the width W5 of the laminated core package 4 is 32mm-102mm. Specifically, the width W5 of the laminated core package 4 is 32mm, 40mm, 50mm, 60mm, 70mm, 80mm, 90mm, 100mm, 102mm or any value within the above range.

[0035] In some embodiments of this utility model, the thickness T5 of the laminated core package 4 is 30mm-80mm. Specifically, the thickness T5 of the laminated core package 4 is 30mm, 40mm, 50mm, 60mm, 70mm, 80mm or any value within the above range.

[0036] In some embodiments of this utility model, the length L6 of the multilayer liquid aluminum electrolytic capacitor 5, excluding the upper positive and negative terminals, is 82mm-233mm. Specifically, the length L6 of the multilayer liquid aluminum electrolytic capacitor 5, excluding the upper positive and negative terminals, is 82mm, 90mm, 100mm, 110mm, 120mm, 130mm, 140mm, 150mm, 160mm, 170mm, 180mm, 190mm, 200mm, 210mm, 220mm, 230mm, 233mm, or any value within the above range.

[0037] In some embodiments of this utility model, the width W6 of the multilayer liquid aluminum electrolytic capacitor 5 is 37mm-108mm. Specifically, the width W6 of the multilayer liquid aluminum electrolytic capacitor 5 is 37mm, 40mm, 50mm, 60mm, 70mm, 80mm, 90mm, 100mm, 108mm or any value within the above range.

[0038] In some embodiments of this utility model, the thickness T6 of the multilayer liquid aluminum electrolytic capacitor 5 is 35mm-86mm. Specifically, the thickness T6 of the multilayer liquid aluminum electrolytic capacitor 5 is 35mm, 40mm, 45mm, 50mm, 55mm, 60mm, 65mm, 70mm, 75mm, 80mm, 85mm, 86mm or any value within the above range.

[0039] In some embodiments of this utility model, the stacked core package 4 includes 2-6 stacked secondary core packages 3. Specifically, the stacked core package 4 includes 2, 3, 4, 5, or 6 stacked secondary core packages 3.

[0040] In some embodiments of this utility model, the pressure relief valve 54 is a one-way pressure relief valve.

[0041] The beneficial effects of this utility model are as follows:

[0042] This invention uses laminated foil as the anode foil for liquid aluminum electrolytic capacitors, significantly improving the specific capacitance. By assembling square aluminum electrolytic capacitors, it further saves circuit board space and reduces the volume of integrated circuit boards. The use of a laminated structure to fabricate the liquid aluminum electrolytic capacitor solves the problem of powder shedding caused by excessive curvature in wound laminated foil structures. Furthermore, the large number of tabs in the laminated structure significantly reduces the internal resistance of the liquid aluminum electrolytic capacitor. A one-way pressure relief valve is installed on the top of the aluminum electrolytic capacitor product. When the internal pressure of the aluminum electrolytic capacitor reaches the critical pressure, the pressure relief valve automatically opens to release pressure, effectively solving the problems of insufficient service life and easy leakage and bursting during long-term use of existing liquid aluminum electrolytic capacitors, thus improving the product's service life and safety. Attached Figure Description

[0043] Figure 1 A schematic diagram of the anode foil 1 of the multilayer liquid aluminum electrolytic capacitor provided by this utility model;

[0044] Figure 2 A schematic diagram of the cathode foil 2 of the multilayer liquid aluminum electrolytic capacitor provided by this utility model;

[0045] Figure 3 A schematic diagram of the stacked structure secondary core package 3 provided by this utility model;

[0046] Figure 4 A schematic diagram of the stacked core package 4 provided by this utility model;

[0047] Figure 5 A schematic diagram of the multilayer liquid aluminum electrolytic capacitor 5 provided by this utility model;

[0048] The labels in the diagram are as follows: 1. Anode foil; 11. Anode tab; 12. Laminated foil; W1. Width of laminated foil 12; W2. Width of anode tab 11; W3. Protective width of anode tab 11; L1. Length of laminated foil 12; L2. Length of anode tab 11; 2. Cathode foil; 21. Cathode tab; 22. Current collector; W1'. Width of current collector 22; W2'. Width of cathode tab 21; W3'. Protective width of cathode tab 21; L1'. Length of current collector 22; L2'. Length of cathode tab 21; 3. Laminated sub-core package; 31. Alternating laminated anode / cathode foil; 32. Electrolytic paper; 33. Multilayer 34. Anode tab; 35. Multilayer cathode tab; 36. High-temperature tape; L4. Length of the stacked structure secondary core package 3 excluding the upper multilayer tab; W4. Width of the stacked structure secondary core package 3; 4. Stacked structure core package; L5. Length of the stacked structure core package 4 excluding the upper multilayer tab; W5. Width of the stacked structure core package 4; T5. Thickness of the stacked structure core package 4; 5. Stacked liquid aluminum electrolytic capacitor; 51. Aluminum shell; 52. Positive terminal; 53. Negative terminal; 54. Pressure relief valve; L6. Length of the stacked liquid aluminum electrolytic capacitor 5 excluding the upper positive and negative terminals; W6. Width of the stacked liquid aluminum electrolytic capacitor 5; T6. Thickness of the stacked liquid aluminum electrolytic capacitor 5. Detailed Implementation

[0049] The following description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

[0050] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0051] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0052] Unless explicitly stated otherwise, all scopes referenced in this invention include end values.

[0053] The term "at least one" is used in this invention to describe the elements and components described herein. This is done merely for convenience and to provide a general meaning regarding the scope of this invention. This description should be understood to include one or at least one, and the singular includes the plural, unless clearly otherwise indicated.

[0054] Unless otherwise defined, all technical terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. Although similar or equivalent methods and materials may be used in the implementation or testing of embodiments of this invention, suitable methods and materials are described below. All publications, patent applications, patents, and other references mentioned in this invention are incorporated herein by reference in their entirety, except where specific paragraphs are cited. In case of any conflict, this specification and its included definitions shall prevail. Furthermore, materials, methods, and examples are illustrative only and are not intended to be limiting.

[0055] Example 1

[0056] 1) An anode foil 1 with a rectangular sheet structure, the lower rectangular area of ​​which is a laminated foil 12 (single sheet thickness of 130μm, rated voltage of 450V), and the upper part is an anode tab 11, such as Figure 1 As shown; where, in anode foil 1, L1 = 128 mm, W1 = 53 mm, L2 = 40 mm, W2 = 10 mm, and W3 = 10 mm. Aluminum foil (20 μm thick) is die-cut into cathode foil 2 with a rectangular sheet structure. The lower rectangular area of ​​cathode foil 2 is the current collector 22, and the upper part is the cathode tab 21, as shown. Figure 2 As shown. Among them, in cathode foil 2, L1' = 128mm, W1' = 53mm, L2' = 40mm, W2' = 10mm, and W3' = 10mm.

[0057] 2) Using a stacking machine, the 65 anode foils 1 and 66 cathode foils 2 obtained in step 1) are alternately stacked with 65×2 sheets of electrolytic paper 32 (each sheet 30μm thick), and then fixed with multiple strips of high-temperature adhesive tape 35 to obtain a multilayered sub-core package 3. The foils used for the initial and final stacking of the multilayered sub-core package 3 are both cathode foils 2. Figure 3 As shown; where L4 = 130mm and W4 = 55mm.

[0058] 3) After neatly stacking the four laminated core packages 3, bind them with high-temperature tape 35 to obtain the laminated core package 4, as shown. Figure 4 As shown; where L5 = 130mm, W5 = 55mm, T5 = 51mm.

[0059] 4) The laminated core package 4 obtained in step 3) is sequentially subjected to the following processes: tab shaping, tab wrapping, punching, post riveting, cover plate welding, vacuum drying, liquid injection, and sealing, to obtain the laminated liquid aluminum electrolytic capacitor 5, as shown below. Figure 5 As shown; where L6 = 160mm, W6 = 60mm, T6 = 56mm.

[0060] Example 2

[0061] 1) An anode foil 1 with a rectangular sheet structure, the lower rectangular area of ​​which is a laminated foil 12 (single sheet thickness of 150μm, rated voltage of 450V), and the upper part is an anode tab 11, such as Figure 1 As shown; where, in anode foil 1, L1 = 128 mm, W1 = 53 mm, L2 = 40 mm, W2 = 10 mm, and W3 = 10 mm. Aluminum foil (20 μm thick) is die-cut into cathode foil 2 with a rectangular sheet structure. The lower rectangular area of ​​the cathode foil is the current collector 22, and the upper part is the cathode tab 21, as shown. Figure 2 As shown. Among them, in cathode foil 2, L1' = 128mm, W1' = 53mm, L2' = 40mm, W2' = 10mm, and W3' = 10mm.

[0062] 2) Using a stacking machine, the 60 anode foils 1 and 61 cathode foils 2 obtained in step 1) are alternately stacked with 60×2 sheets of electrolytic paper 32 (each sheet 30μm thick), and then fixed with multiple strips of high-temperature adhesive tape 35 to obtain a multilayered sub-core package 3. The foils used for the initial and final stacking of the multilayered sub-core package 3 are both cathode foils 2. Figure 3 As shown; where L4 = 130mm and W4 = 55mm.

[0063] 3) After neatly stacking the four laminated core packages 3, bind them with high-temperature tape 35 to obtain the laminated core package 4, as shown. Figure 4 As shown; where L5 = 130mm, W5 = 55mm, T5 = 51mm.

[0064] 4) The laminated core package 4 obtained in step 3) is sequentially subjected to the following processes: tab shaping, tab wrapping, punching, post riveting, cover plate welding, vacuum drying, liquid injection, and sealing, to obtain the laminated liquid aluminum electrolytic capacitor 5, as shown below. Figure 5 As shown; where L6 = 160mm, W6 = 60mm, T6 = 56mm.

[0065] Example 3

[0066] 1) An anode foil 1 with a rectangular sheet structure, the lower rectangular area of ​​which is a laminated foil 12 (single sheet thickness of 180μm, rated voltage of 500V), and the upper part is an anode tab 11, such as Figure 1As shown; where, in anode foil 1, L1 = 128 mm, W1 = 53 mm, L2 = 40 mm, W2 = 10 mm, and W3 = 10 mm. Aluminum foil (20 μm thick) is die-cut into cathode foil 2 with a rectangular sheet structure. The lower rectangular area of ​​the cathode foil is the current collector 22, and the upper part is the cathode tab 21, as shown. Figure 2 As shown. Among them, in cathode foil 2, L1' = 128mm, W1' = 53mm, L2' = 40mm, W2' = 10mm, and W3' = 10mm.

[0067] 2) Using a stacking machine, the 70 anode foils 1 and 71 cathode foils 2 obtained in step 1) are alternately stacked with 70×2 sheets of electrolytic paper 32 (each sheet 30μm thick), and then fixed with multiple strips of high-temperature adhesive tape 35 to obtain a multilayered sub-core package 3. The foils used for the initial and final stacking of the multilayered sub-core package 3 are both cathode foils 2. Figure 3 As shown; where L4 = 130mm and W4 = 55mm.

[0068] 3) After neatly stacking the four laminated core packages 3, bind them with high-temperature tape 35 to obtain the laminated core package 4, as shown. Figure 4 As shown; where L5 = 130mm, W5 = 55mm, T5 = 51mm.

[0069] 4) The laminated core package 4 obtained in step 3) is sequentially subjected to the following processes: tab shaping, tab wrapping, punching, post riveting, cover plate welding, vacuum drying, liquid injection, and sealing, to obtain the laminated liquid aluminum electrolytic capacitor 5, as shown below. Figure 5 As shown; where L6 = 160mm, W6 = 60mm, T6 = 56mm.

[0070] Example 4

[0071] 1) An anode foil 1 with a rectangular sheet structure, the lower rectangular area of ​​which is a laminated foil 12 (single sheet thickness of 180μm, rated voltage of 600V), and the upper part is an anode tab 11, such as Figure 1 As shown; where, in anode foil 1, L1 = 128 mm, W1 = 53 mm, L2 = 40 mm, W2 = 10 mm, and W3 = 10 mm. Aluminum foil (20 μm thick) is die-cut into cathode foil 2 with a rectangular sheet structure. The lower rectangular area of ​​the cathode foil is the current collector 22, and the upper part is the cathode tab 21, as shown. Figure 2 As shown. Among them, in cathode foil 2, L1' = 128mm, W1' = 53mm, L2' = 40mm, W2' = 10mm, and W3' = 10mm.

[0072] 2) Using a stacking machine, the 70 anode foils 1 and 71 cathode foils 2 obtained in step 1) are alternately stacked with 70×2 sheets of electrolytic paper 32 (each sheet 30μm thick), and then fixed with multiple strips of high-temperature adhesive tape 35 to obtain a multilayered sub-core package 3. The foils used for the initial and final stacking of the multilayered sub-core package 3 are both cathode foils 2. Figure 3 As shown; where L4 = 130mm and W4 = 55mm.

[0073] 3) After neatly stacking the four laminated core packages 3, bind them with high-temperature tape 35 to obtain the laminated core package 4, as shown. Figure 4 As shown; where L5 = 130mm, W5 = 55mm, T5 = 51mm.

[0074] 4) The laminated core package 4 obtained in step 3) is sequentially subjected to the following processes: tab shaping, tab wrapping, punching, post riveting, cover plate welding, vacuum drying, liquid injection, and sealing, to obtain the laminated liquid aluminum electrolytic capacitor 5, as shown below. Figure 5 As shown; where L6 = 160mm, W6 = 60mm, T6 = 56mm.

[0075] Comparative Example 1

[0076] 1) The electrolytic foil (thickness of 130μm, rated voltage of 450V), cathode foil (thickness of 20μm) and electrolytic paper (thickness of 30μm) are alternately stacked and wound into a cylindrical core package of Ф56×130mm. During the winding process, the anode foil and cathode foil are riveted with tabs respectively. The top of the core package after winding contains anode tabs and cathode tabs, each with a length of 40mm and a width of 10mm.

[0077] 2) The cylindrical core obtained in step 1) is packaged into a Ф60×160mm shell and then subjected to punching, post riveting, cover welding, vacuum drying, liquid injection and sealing processes to obtain a cylindrical liquid aluminum electrolytic capacitor.

[0078] Comparative Example 2

[0079] 1) The laminated foil (thickness of 180μm, rated voltage of 450V), cathode foil (thickness of 20μm) and electrolytic paper (thickness of 30μm) are alternately stacked and wound into a cylindrical core package of Ф56×130mm. During the winding process, the anode foil and cathode foil are riveted with tabs respectively. The top of the core package after winding contains anode tabs and cathode tabs, each with a length of 40mm and a width of 10mm.

[0080] 2) The cylindrical core obtained in step 1) is packaged into a Ф60×160mm shell and then subjected to punching, post riveting, cover welding, vacuum drying, liquid injection and sealing processes to obtain a cylindrical liquid aluminum electrolytic capacitor.

[0081] Comparative Example 3

[0082] 1) The formed foil (single sheet thickness of 130μm, rated voltage of 450V) is die-cut into an anode foil 1 with a rectangular sheet structure. The lower rectangular area of ​​the anode foil 1 has formed areas 12 on both sides, and the upper part is an unformed anode tab 11. Using the same mold, a 20μm aluminum foil is die-cut into a cathode foil 2 with a rectangular sheet structure. The lower rectangular area of ​​the cathode foil is aluminum foil 22, and the upper part is a cathode tab 21.

[0083] 2) Using a stacking machine, the 65 anode foils 1 and 66 cathode foils 2 obtained in step 1) are alternately stacked with 65×2 pieces of electrolytic paper 32 (each piece is 30μm thick) and then fixed with multiple strips of high-temperature tape 35 to obtain a stacked structure sub-core package 3. The foils of the initial stacking and the final stacking of the stacked structure sub-core package 3 are both cathode foils 2.

[0084] 3) After neatly stacking the four stacked sub-core packages, they are bound together with high-temperature tape 35 to obtain the stacked core package 4.

[0085] 4) The laminated core package 4 obtained in step 3) is subjected to the following processes in sequence: tab shaping, tab wrapping, punching, post riveting, cover plate welding, vacuum drying, liquid injection and sealing, to obtain the laminated liquid aluminum electrolytic capacitor 5.

[0086] The product test results are shown in Table 1.

[0087] Table 1: Electrical performance test results of liquid aluminum electrolytic capacitors

[0088] Rated voltage (V) Capacity (μF) ESR(mΩ) loss(%) Example 1 450 12519 5.03 2.43 Example 2 450 13007 4.84 2.34 Example 3 500 8884 7.30 3.54 Example 4 600 6070 11.23 5.46 Comparative Example 1 450 8878 11.70 6.60 Comparative Example 2 450 10712 9.70 5.46 Comparative Example 3 450 10112 6.38 3.09

[0089] As shown in Table 1, the test results of this invention demonstrate that the multilayer liquid aluminum electrolytic capacitor exhibits high capacitance, low internal resistance, and low loss. Comparative Example 1, using anode foil assembly assembled with traditional formation processes, shows poor performance in all aspects. Comparative Example 2, using multilayer foil assembly, suffers from low space utilization, and its performance needs further improvement. Comparative Example 3, using anode foil assembly assembled with traditional formation processes, exhibits over 20% lower capacitance and over 20% higher internal resistance compared to the multilayer liquid aluminum electrolytic capacitor assembled with multilayer foil of this invention.

[0090] The above description is merely a preferred embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A multilayer liquid aluminum electrolytic capacitor, comprising an aluminum shell, a positive terminal, a negative terminal, a pressure relief valve, and a multilayer core; characterized in that, The laminated core package is located inside the aluminum shell, and the pressure relief valve is located on the top of the aluminum shell; The laminated core package includes multiple anode tabs and multiple cathode tabs; the multiple anode tabs are located on the upper left side of the laminated core package; the multiple cathode tabs are located on the upper right side of the laminated core package. The positive electrode post passes through the aluminum shell and connects to the multi-layer anode tabs of the laminated core package; The negative electrode post passes through the aluminum shell and is connected to the multi-layer cathode tabs of the laminated core package; The stacked core package is formed by binding multiple stacked sub-core packages together with high-temperature tape. The multilayer sub-core package includes alternating layers of anode / cathode foil, electrolytic paper, multilayer anode tabs, multilayer cathode tabs, and high-temperature tape. Each tab in the multilayer anode tabs is connected to the anode foil in the alternating layers of anode / cathode foil, and each tab in the multilayer cathode tabs is connected to the cathode foil in the alternating layers of anode / cathode foil. The electrolytic paper is located between the alternating layers of anode and cathode foil. The laminated secondary core package is composed of alternating layers of anode foil, cathode foil, and electrolytic paper. The anode foil includes an anode tab and a laminated foil. The anode tab and the core aluminum foil of the laminated foil are connected to form an integrated structure. The anode tab is located at the upper left of the laminated foil. The cathode foil includes a cathode tab and a current collector. The cathode tab and the current collector are connected to form an integrated structure, and the cathode tab is located to the upper right of the current collector.

2. The multilayer liquid aluminum electrolytic capacitor according to claim 1, characterized in that, The foils of the starting and ending stacks of the sub-core package in the laminated structure are both cathode foils; The layered sub-core package is composed of N anode foils, N+1 cathode foils, and 2N electrolytic paper sheets stacked alternately; where N is an integer from 1 to 100. High-temperature tape is distributed around the core package of the laminated structure.

3. The multilayer liquid aluminum electrolytic capacitor according to claim 1, characterized in that, The length of the anode tab is 30mm-80mm; The width of the anode tab is 5mm-20mm; The protective width of the anode tab is 3mm-15mm; The length of the laminated foil is 50mm-200mm; The width of the laminated foil is 30mm-100mm.

4. The multilayer liquid aluminum electrolytic capacitor according to claim 1, characterized in that, The length of the cathode tab is 30mm-80mm; The width of the cathode tab is 5mm-20mm; The protective width of the cathode tab is 3mm-15mm; The length of the current collector is 50mm-200mm; The width of the current collector is 30mm-100mm.

5. The multilayer liquid aluminum electrolytic capacitor according to claim 1, characterized in that, The length of the laminated secondary core package, excluding the upper multi-layer electrode tabs, is 52mm-202mm. The width of the secondary core package in the laminated structure is 32mm-102mm.

6. The multilayer liquid aluminum electrolytic capacitor according to claim 1, characterized in that, The thickness of a single laminated foil is 100μm-200μm; The rated voltage of the laminated foil is 400V-700V; The thickness of a single current collector is 10μm-30μm; The thickness of a single sheet of electrolytic paper is 25μm-35μm.

7. The multilayer liquid aluminum electrolytic capacitor according to claim 1, characterized in that, The length of the laminated core package, excluding the upper multi-layer tabs, is 52mm-202mm. The width of the laminated core package is 32mm-102mm; The thickness of the laminated core package is 30mm-80mm.

8. The multilayer liquid aluminum electrolytic capacitor according to claim 1, characterized in that, The length of the multilayer liquid aluminum electrolytic capacitor, excluding the upper positive and negative terminals, is 82mm-233mm. The width of the multilayer liquid aluminum electrolytic capacitor ranges from 37mm to 108mm; The thickness of multilayer liquid aluminum electrolytic capacitors ranges from 35mm to 86mm.

9. The multilayer liquid aluminum electrolytic capacitor according to claim 1, characterized in that, The stacked core package contains 2-6 stacked sub-core packages.

10. The multilayer liquid aluminum electrolytic capacitor according to claim 1, characterized in that, The pressure relief valve is a one-way pressure relief valve.

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