Flexible capacitor and preparation method thereof

Abstract

The invention discloses a flexible capacitor and a preparation method thereof, and belongs to the technical field of flexible energy storage. The capacitor main body provided by the invention is formed by the blended yarns based on the metal fibers, and the whole yarns have the characteristic of high capacitance. On the basis of a capacitance yarn with a fixed length, a plurality of conductive sections are introduced to equally divide the yarn into a plurality of segmented yarns with uniform lengths, then the conductive sections with the same polarity are connected and tested by using the same lead, and the capacitance of the whole yarn is increased in a manner of connecting segmented capacitors in parallel. And the finally manufactured flexible capacitor is good in performance, small in size, light, thin and breathable, and is suitable for being applied to multiple occasions.

Description

Technical Field

[0001] The present invention relates to the field of flexible energy storage technology, and in particular to a flexible capacitor and a preparation method thereof. Background Art

[0002] Capacitors are the most commonly used devices in circuit design. They are essentially composed of two plates, and the simplest structure is a flat plate capacitor. For a flat plate capacitor, its capacitance is proportional to the plate area and the dielectric constant of the medium relative to a vacuum, and inversely proportional to the distance. Therefore, to obtain a large capacitance value, the plate area and the dielectric constant of the medium should be increased, and the distance between the plates should be reduced.

[0003] With the continuous development of science and technology and the increasing demand for applications, traditional designs are no longer sufficient to meet existing needs. In order to improve the performance of capacitors, traditional capacitors initially adopted a sandwich structure, and the capacitance value was increased by increasing the plane and thickness of the plate, which would hinder the miniaturization design of capacitors. The interdigital capacitor in the prior art is designed to be a laminated interdigital capacitor based on the traditional interdigital electrode structure by filling dielectrics between the layers. The interlayer preparation is complex and hard. In the columnar interdigital supercapacitor in the prior art, the positive electrode shell and the positive electrode core share a negative electrode core, and its hard structure cannot be applied to the surface of irregular objects. In the prior art, the flexible conductive yarn and its preparation process are obtained by immersion treatment in a composite conductive ink to obtain a flexible wire yarn, which has excellent conductive performance and conductive stability and will produce a conduction phenomenon, which will shield the final electromagnetic wave instead of absorbing it. In the prior art, the flexible capacitor preparation method based on waste textiles is obtained by acupuncture and chemical means to treat the waste textiles, but its performance stability is unknown and the operation is complicated.

[0004] Therefore, developing a flexible capacitor based on metal fiber blended capacitor yarn to solve the above problems has become a technical problem that needs to be urgently solved in the present invention. Summary of the invention

[0005] Based on the technical problems to be solved by the present invention, a flexible capacitor and a preparation method thereof are proposed. A flexible capacitor based on a metal fiber blended yarn with a cylindrical forked finger structure is proposed. The metal fibers are arranged in the yarn to form a forked finger electrode morphology inside the overall yarn, so that high-capacitance yarn can be obtained while reducing the volume. The overall yarn structure is then split into countless equal-length segments, and the overall yarn capacitance is further improved by parallel superposition of equal-length segmented capacitors.

[0006] To achieve the above objectives, the present invention provides a flexible capacitor and a method for preparing the same.

[0007] One of the purposes of the present invention is to provide a flexible capacitor;

[0008] The flexible capacitor is composed of a cylindrical interdigitated capacitor yarn, a conductive section, and a lead; the capacitor yarn is composed of a metal fiber blended yarn; the metal fiber blended yarn is a blend of metal fiber and conventional fiber;

[0009] The capacitor is in the form of an elongated cylinder as a whole;

[0010] The capacitor is mainly composed of metal fiber blended capacitor yarn.

[0011] Furthermore, the overall yarn length of the capacitor is L Y The length of the capacitor yarn as a whole is L, and the length of the metal fiber is L M , conventional fiber length is L N ;

[0012] The conductive cross section d introduced in the overall yarn length of the capacitor n+1 The whole is evenly divided into n sections, each section is L in length, the two ends of the section are respectively positive and negative, and the conductive sections of the same level are connected to each other using leads of the same level;

[0013] The metal fiber content is not more than 20%, and the length L M The conventional fiber length L is 38 mm to 51 mm. N 32mm~114mm.

[0014] Furthermore, the conductive cross section is selected from one of copper sheet, conductive silver paste or conductive silver glue;

[0015] The conductive section is located in the middle and head end sections of the yarn;

[0016] The number of the conductive cross sections is n+1.

[0017] Furthermore, the lead wire is a connection wire drawn from a conductive cross section for easy testing;

[0018] The lead wires are divided into a positive lead wire S1 and a negative lead wire S2;

[0019] Among the leads, leads of the same polarity are connected to each other;

[0020] Preferably, the lead wire is at least one of pure copper wire, enameled wire, and insulated wire.

[0021] Furthermore, the overall diameter of the elongated cylinder is 1 mm to 5 mm;

[0022] The total length L of the elongated cylinder Y >45mm;

[0023] The volume mass of the slender cylinder is 0.65 g / cm 3 -1.00g / cm3 .

[0024] Furthermore, the n segments are the number of segments, And n≥1.

[0025] Furthermore, the length of each segment is L;

[0026] The length range of each segment is L M <L<2L M , which is used to avoid the phenomenon of no capacitance caused by the front and back of the metal fiber being connected to the conductive section or the metal fiber being misaligned.

[0027] Furthermore, the metal fiber has an electrical conductivity greater than 10 4 s / m metal fibers;

[0028] The metal fiber is a metal fiber with an insulating layer on its surface;

[0029] Preferably, the metal fiber with the surface coated with an insulating layer is at least one of stainless steel fiber, copper fiber, aluminum fiber, iron-nickel fiber, and surface silver-plated fiber that has been subjected to insulation treatment.

[0030] Furthermore, the conventional fiber is a dielectric fiber without conductive properties;

[0031] Preferably, the conventional fiber is at least one of nylon, polyester, polypropylene, vinylon, chlorofiber, acrylic, spandex, cotton and wool fibers.

[0032] A second object of the present invention is to provide a method for preparing a flexible capacitor, the method comprising the following steps:

[0033] S1. Inserting the metal fiber blended yarn with a cylindrical interdigitated structure into n segments of cylindrical tubes of the same specifications to shape the yarn, so that the yarn is in close contact in the tube, leaving gaps between the segmented tubes to introduce the conductive cross section, and obtaining the main structure of the flexible capacitor;

[0034] S2. Introduce conductive sections into the middle gap of the cylindrical tube and the outer section of the tube, and cure and bond at high temperature;

[0035] S3. Connect leads to each conductive section and connect the leads of the same polarity to each other to obtain a flexible capacitor.

[0036] Compared with the prior art, the present invention proposes a flexible capacitor and a preparation method thereof, which has the following beneficial effects:

[0037] 1. The present invention realizes the internal interdigital electrode structure design by uniformly arranging the internal metal fibers of the metal short fiber blended yarn, which can effectively reduce the volume and maximize the capacitance formed between the metal fibers. The yarn finally presented has excellent capacitance performance, light weight and good air permeability.

[0038] 2. The present invention designs the length of the whole yarn in segments and implements parallel superposition of segmented capacitors, which can effectively increase the total capacitance of the whole yarn. This method is innovative, has a simple process flow, is low-cost, and is easy to achieve later batch production.

[0039] 3. The flexible capacitor based on the metal fiber blended yarn with a cylindrical interdigitated structure provided by the present invention can be integrated into the fabric by weaving at a later stage to prepare a high-capacitance fabric, thereby realizing multi-scenario application. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 A schematic diagram of the structure of a flexible capacitor test sample according to an embodiment of the present invention is shown; wherein: 1, conductive cross section; 2, yarn, 21, metal fiber, 22, conventional fiber; 3, positive electrode lead; 4, negative electrode lead;

[0041] Figure 2 The schematic diagram of the overall test sample structure of a flexible capacitor according to an embodiment of the present invention is shown; wherein: d1~d n , conductive cross section; L Y , total yarn length, L M , Metal fiber length, L N , conventional fiber length; L segment length; n segment number; S1, positive electrode lead; S2, negative electrode lead;

[0042] Figure 3 A schematic diagram of a high-capacitance metal short fiber blended yarn test sample with a cylindrical interdigitated electrode structure according to an embodiment of the present invention is shown; wherein: 1. conductive cross section; 2. yarn, 21. metal fiber, 22. conventional fiber; 3. positive electrode lead; 4. negative electrode lead. DETAILED DESCRIPTION

[0043] The exemplary embodiments of the present application will be described in more detail below with reference to the accompanying drawings. Although the exemplary embodiments of the present application are shown in the accompanying drawings, it should be understood that the present application can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided in order to enable a more thorough understanding of the present application and to fully convey the scope of the present application to those skilled in the art.

[0044] In the following examples, unless otherwise specified, the technical means adopted are conventional means well known to those skilled in the art, and the reagents and materials in the present invention are obtained from the market or other public channels.

[0045] The experimental materials and equipment involved in the present invention mainly include but are not limited to:

[0046] Reagents:

[0047] Conductive silver paste (Shenzhen Yuanshengda Industrial Co., Ltd.);

[0048] instrument:

[0049] Carding machine (A186G carding machine, Qingdao Dongchang Textile Machinery Manufacturing Co., Ltd.), drawing frame (FA387B high-speed digital drawing frame, Qingdao Yunlong Textile Machinery Co., Ltd.), roving frame (HCP2035 intelligent roving frame, Saite Global Machinery Qingdao Co., Ltd.), spinning frame (JWF1566 intelligent upgraded spinning frame, Jingwei Textile Machinery Co., Ltd.), LCR tester (HPS2810B, Changzhou Haierpa Electronic Technology Co., Ltd.).

[0050] The flexible capacitor and its preparation method described in the present invention are flexible capacitors based on metal fiber blended yarns with cylindrical interdigital structures, which are realized by metal short fiber blended yarn structures. Through the effective distribution structure design of metal fibers and conventional fibers (i.e., mixed structure design), the conventional fibers isolate the adjacent metal fibers, and after combing, a collection of parallel fibers is formed, and finally a relatively long interdigital capacitor overall structure with a length that meets the spinning processing conditions is formed, thereby establishing a flexible capacitor with high capacitance, high electromagnetic energy storage characteristics and high electromagnetic energy loss characteristics.

[0051] The technical principles of the present invention mainly include:

[0052] The capacitance between any two adjacent parallel metal fibers in the metal fiber blended capacitive yarn satisfies the calculation formula of the parallel plate capacitor: Where C is the capacitance between two adjacent metal fibers, S is the relative area of ​​the two metal fibers, and d is the distance between the metal fibers. ε0 is the dielectric constant under vacuum conditions, which is 8.85×10 -12 (F / m), ε α is the dielectric constant of the medium relative to air.

[0053] The overall capacitance of the flexible capacitor is composed of n segmented cylindrical capacitors connected in parallel, such as Figure 1 As shown, satisfying C P =nC, where C P is the total capacitance of the capacitor of the metal fiber blended capacitor yarn, and C is the capacitance of each segment.

[0054] Based on the above principle, the present invention proposes a method for preparing a flexible capacitor, which comprises the following steps:

[0055] S1. Inserting the metal fiber blended yarn with a cylindrical interdigitated structure into n segments of cylindrical tubes of the same specifications to shape the yarn, so that the yarn is in close contact in the tube, leaving gaps between the segmented tubes to introduce the conductive cross section, and obtaining the main structure of the flexible capacitor;

[0056] The long length yarn is divided into n segments with a segment length of L and a conductive cross section is introduced at the interval, so that the head end of the metal fiber inside the blended yarn can contact the conductive cross sections at both ends while there is an intersection length between them, thus forming an effective interdigitated electrode structure and improving the segmented capacitance performance;

[0057] S2. Introduce a conductive section into the gap in the middle of the cylindrical tube and the section outside the tube, and cure and bond at high temperature to ensure that the yarn in the tube is fully bonded to the conductive section, and that some of the metal fibers in the yarn are connected to the conductive section;

[0058] S3. Connect leads at each conductive section and connect the leads of the same polarity to each other, which can effectively superimpose the segmented capacitors in parallel to obtain the total capacitance of the flexible capacitor and facilitate subsequent testing.

[0059] With a specific yarn segment length and yarn segment number, the overall yarn capacitance value can be increased. The flexible capacitor is easy to operate and has stable performance, is breathable and has strong shape adaptability, and can meet the use under various conditions.

[0060] The flexible capacitor prepared by the present invention has an overall structure as follows Figure 2 As shown, the conductive cross-section d1 to d2 formed by curing the conductive paste n+1 , n+1 at both ends and in the middle, arranged in alternating order of positive and negative electrodes, and connecting the positive conductive section and the negative conductive section to the positive lead S1 and the negative lead S2 respectively according to the polarity; the length of the long-length blended yarn is L Y , including the length L M The metal fiber and length L N Conventional fibers, yarns are n+1 conductive cross-sections d1~d n+1 Isolation, and the presence of indefinite metal fibers and conventional fibers with n+1 conductive cross sections d1~d n+1 In direct contact, the metal fibers and conventional fibers in the blended yarn are arranged parallel to each other and staggered to form a quasi-forked shape. The final total capacitance is composed of n sub-capacitors connected in parallel.

[0061] Example 1

[0062] The invention proposes a method for preparing a flexible capacitor based on a metal fiber blended yarn with a cylindrical interdigital structure.

[0063] Mainly include:

[0064] The present invention provides a method for preparing a flexible capacitor. The blended yarn is composed of stainless steel staple fibers and polyester staple fibers, wherein the conductivity of the stainless steel staple fibers is 1.5×10 6 S / m stainless steel fiber, content is 5%, length is 45mm; polyester fiber content is 95%, polyester fiber length is 38mm. It includes the following steps:

[0065] The stainless steel / polyester blended yarn was stuffed into three sections of PVC hose with a diameter of 3 mm and a length of 50 mm. The total length was 150 mm. The volume mass of the yarn in the hose was 0.72 g / cm 3 , so that the yarn fits tightly inside the PVC hose. Inject 0.1ml of conductive silver paste into the gap in the middle of the PVC hose and at both ends of the outer side of the tube, so that the sections at the segment and the two ends of the outer side are fully infiltrated with silver paste, and cure at 80℃ for 2h to form 4 conductive sections.

[0066] At each conductive section of the capacitor, the insulated wires of each pole are connected in sequence according to the principle of "positive to positive, negative to negative", and then the insulated wires of the same pole are bonded with silver paste, and cured at 80°C for 2h to form positive lead S1 and negative lead S2 for subsequent testing. The prepared capacitor consists of 4 conductive sections, metal fiber blended yarn, positive lead and negative lead.

[0067] result:

[0068] The flexible capacitor based on the metal fiber blended yarn with cylindrical interdigital structure prepared by the present invention has an overall structure as follows: Figure 1 As shown, the conductive cross-section 1 formed by curing the conductive slurry has a total of 4 at both ends and in the middle, arranged in alternating order of positive and negative electrodes, and the positive conductive cross-section and the negative conductive cross-section are connected to the positive lead 3 and the negative lead 4 respectively according to polarity; the long-length blended yarn 2, including metal fiber 21 and conventional fiber 22, the yarn is isolated by 4 conductive cross-sections 1, and there are indefinite metal fibers 21 and conventional fibers 22 in direct contact with the 4 conductive cross-sections 1. The metal fibers 21 and conventional fibers 22 in the blended yarn are arranged parallel to each other to form a cross-finger shape, and the final total capacitance is composed of 3 sub-capacitors in parallel. The test results show that the capacitor resistance is 4.03MΩ and the capacitance is 3.14nF.

[0069] Example 2

[0070] The invention proposes a method for preparing a flexible capacitor based on a metal fiber blended yarn with a cylindrical interdigital structure.

[0071] Mainly include:

[0072] The present invention provides a method for preparing a flexible capacitor. The blended yarn is composed of stainless steel staple fibers and polyester staple fibers, wherein the conductivity of the stainless steel staple fibers is 1.5×106 S / m stainless steel fiber, content is 5%, length is 45mm; polyester fiber content is 95%, polyester fiber length is 38mm. It includes the following steps:

[0073] The stainless steel / polyester blended yarn was stuffed into three sections of PVC hose with a diameter of 3 mm and a length of 70 mm. The total length was 210 mm, and the volume mass of the yarn in the tube was 0.72 g / cm 3 , so that the yarn fits tightly inside the PVC hose. Inject 0.1ml of conductive silver paste into the gap in the middle of the PVC hose and at both ends of the outer side of the tube, so that the sections at the segment and the two ends of the outer side are fully infiltrated with silver paste, and cure at 80℃ for 2h to form 4 conductive sections.

[0074] At each conductive section of the capacitor, the insulated wires of each pole are connected in sequence according to the principle of "positive to positive, negative to negative", and then the insulated wires of the same pole are bonded with silver paste, and cured at 80°C for 2h to form positive lead S1 and negative lead S2 for subsequent testing. The prepared capacitor consists of 4 conductive sections, metal fiber blended yarn, positive lead and negative lead.

[0075] result:

[0076] The flexible capacitor based on the metal fiber blended yarn with cylindrical interdigital structure prepared by the present invention has an overall structure as follows: Figure 1 As shown, the conductive cross-section 1 formed by curing the conductive slurry has a total of 4 at both ends and in the middle, arranged in alternating order of positive and negative electrodes, and the positive conductive cross-section and the negative conductive cross-section are connected to the positive lead 3 and the negative lead 4 respectively according to the polarity; the long-length blended yarn 2, including metal fiber 21 and conventional fiber 22, the yarn is isolated by 4 conductive cross-sections 1, and there are indefinite metal fibers 21 and conventional fibers 22 in direct contact with the 4 conductive cross-sections 1. The metal fibers 21 and conventional fibers 22 in the blended yarn are arranged parallel to each other to form a cross-finger shape, and the final total capacitance is composed of 3 sub-capacitors in parallel. The test results show that the capacitor resistance is 4.72MΩ and the capacitance is 3.94nF.

[0077] Example 3

[0078] The invention proposes a method for preparing a flexible capacitor based on a metal fiber blended yarn with a cylindrical interdigital structure.

[0079] Mainly include:

[0080] The present invention provides a method for preparing a flexible capacitor. The blended yarn is composed of stainless steel staple fibers and polyester staple fibers, wherein the conductivity of the stainless steel staple fibers is 1.5×10 6S / m stainless steel fiber, content is 5%, length is 45mm; polyester fiber content is 95%, polyester fiber length is 38mm. It includes the following steps:

[0081] The stainless steel / polyester blended yarn was stuffed into 7 sections of PVC hose with a diameter of 3 mm and a length of 50 mm. The total length was 350 mm. The volume mass of the yarn in the hose was 0.72 g / cm 3 , so that the yarn fits tightly in the PVC hose. Inject 0.1ml of conductive silver paste into the gap in the middle of the PVC hose and at both ends of the outer side of the tube, so that the sections at the segment and the two ends of the outer side are fully infiltrated with silver paste, and cure at 80℃ for 2h to form 8 conductive sections.

[0082] At each conductive section of the capacitor, connect the insulated wires of each pole in sequence according to the principle of "positive to positive, negative to negative", then use silver paste to bond the insulated wires of the same pole, and cure them at 80°C for 2h to form the positive lead S1 and the negative lead S2 for subsequent testing.

[0083] result:

[0084] The flexible capacitor based on the cylindrical interdigital structure of metal fiber blended yarn prepared by the present invention is composed of 8 conductive sections, metal fiber blended yarn, positive electrode lead and negative electrode lead. Figure 2 As shown, it includes a conductive cross section 1 formed by curing the conductive slurry, with a total of 8 at both ends and the middle position, arranged in an alternating order of positive and negative electrodes, and the positive conductive cross section and the negative conductive cross section are connected to the positive lead S1 and the negative lead S2 respectively according to their polarity; a long length blended yarn 2, which contains metal fibers 21 and conventional fibers 22, and the yarn as a whole is isolated by 8 conductive cross sections 1, and there are indefinite amounts of metal fibers 21 and conventional fibers 22 in direct contact with the 8 conductive cross sections. The metal fibers 21 and conventional fibers 22 in the blended yarn are arranged in parallel and staggered to form a cross-finger shape, and the final total capacitance is composed of 7 sub-capacitors in parallel. The test shows that the capacitor resistance is 2.54MΩ and the capacitance is 8.46nF.

[0085] Comparative Example 1

[0086] This comparative example is used to compare the resistance and capacitance effects of the flexible capacitor described in the present invention.

[0087] Referring to Example 1, Figure 3As shown, the difference is that the flexible capacitor has only two conductive sections on the entire yarn, and does not need to be connected by the same-level leads. The overall length is short. The conductive section 1 formed by the curing of the conductive slurry has one at each end, and is connected to the positive lead 3 and the negative lead 4 according to their polarity; the blended yarn 2 contains metal fibers 21 and conventional fibers 22. The two ends of the yarn are bonded to the conductive section 1, and there are indefinite amounts of metal fibers 21 and conventional fibers 22 in direct contact with the conductive section. The metal fibers 21 and conventional fibers 22 in the blended yarn are arranged parallel to each other and staggered to form a cross-finger-like shape. This comparative example uses a conductivity of 1.5×10 6 S / m stainless steel fiber, content is 5%, length is 45mm; polyester fiber content is 95%, polyester fiber length is 38mm. The specific preparation method includes the following steps:

[0088] (1) Stainless steel / polyester yarn is inserted into a PVC hose with a diameter of 3 mm and a length of 50 mm. The total length is 50 mm and the volume mass of the yarn in the hose is 0.72 g / cm 3 , so that the yarn fits tightly inside the PVC hose.

[0089] (2) 0.1 ml of conductive silver paste was injected into both ends of the PVC hose and cured at 80°C for 2 h to form conductive cross sections at both ends.

[0090] (3) Introduce an insulated wire into the conductive section of the capacitor, and then use silver paste to bond the insulated wire to the conductive section. Curing at 80°C for 2 hours is done for subsequent testing.

[0091] result:

[0092] The measured resistance of the comparative capacitor is 35MΩ and the capacitance is 1.8nF.

[0093] Comparative Example 2

[0094] This comparative example is used to compare the resistance and capacitance effects of the flexible capacitor described in the present invention.

[0095] Referring to Example 2, its preparation method is basically the same as that of Comparative Example 1, such as Figure 3 As shown, the difference is that the flexible capacitor has only two conductive sections on the whole yarn, and does not need to be connected by the same-level leads. The overall length is short. The conductive section 1 formed by the curing of the conductive slurry has one at each end, and is connected to the positive lead 3 and the negative lead 4 according to its polarity; the blended yarn 2 contains metal fibers 21 and conventional fibers 22. The two ends of the yarn are bonded to the conductive section 1, and there are indefinite amounts of metal fibers 21 and conventional fibers 22 in direct contact with the conductive section. The metal fibers 21 and conventional fibers 22 in the blended yarn are arranged parallel to each other and staggered to form a cross-finger shape. The conductivity is 1.5×10 6S / m stainless steel fiber, content is 5%, length is 45mm; polyester fiber content is 95%, polyester fiber length is 38mm. The specific preparation method includes the following steps:

[0096] (1) The stainless steel / polyester yarn is inserted into a PVC hose with a diameter of 3 mm and a length of 70 mm. The total length is 70 mm and the volume mass of the yarn in the hose is 0.72 g / cm 3 , so that the yarn fits tightly inside the PVC hose.

[0097] (2) 0.1 ml of conductive silver paste was injected into both ends of the PVC hose and cured at 80°C for 2 h to form conductive cross sections at both ends.

[0098] (3) Introduce an insulated wire into the conductive section of the capacitor, and then use silver paste to bond the insulated wire to the conductive section. Curing at 80°C for 2 hours is done for subsequent testing.

[0099] result:

[0100] The resistance of the comparative capacitor was measured to be 210 MΩ and the capacitance to be 0.86 nF.

[0101] The samples of Examples 1-3 and Comparative Examples 1-2 were tested, and the capacitance and resistance of the capacitors were tested using an LCR tester at a frequency of 1 KHz. The test results are shown in the table below.

[0102] Table 1 Parameters of Examples and Comparative Examples

[0103] Example n L(mm) <![CDATA[L Y (mm)]]> Resistance(MΩ) Capacitance(nF) 1 3 50 150 4.03 3.14 2 3 70 210 4.72 3.94 3 7 50 350 2.54 8.46 Comparative Example 1 1 50 50 35 1.80 2 1 70 70 210 0.86

[0104] It can be seen from the test results that the flexible capacitor of the present invention has a higher capacitance characteristic, with a maximum capacitance of up to 8.46 nf. Compared with the capacitance value of the short-length capacitor in the comparative embodiment, the capacitance is significantly improved.

[0105] It should be noted that the term "comprises" or any other variation thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only these elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprises..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0106] The above are only embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included within the scope of the claims of the present application.

Claims

1. A flexible capacitor, It is characterized in that The flexible capacitor is composed of a cylindrical interdigitated capacitor yarn, a conductive section, and a lead; the capacitor yarn is composed of a metal fiber blended yarn; the metal fiber blended yarn is a blend of metal fiber and conventional fiber; The capacitor is in the form of an elongated cylinder as a whole; The capacitor is mainly composed of metal fiber blended capacitor yarn.

2. The flexible capacitor according to claim 1, It is characterized in that The overall yarn length of the capacitor is L Y The length of the capacitor yarn as a whole is L, and the length of the metal fiber is L M , conventional fiber length is L N ; The conductive cross section d introduced in the overall yarn length of the capacitor n+1 The whole is evenly divided into n sections, each section is L in length, the two ends of the section are respectively positive and negative, and the conductive sections of the same level are connected to each other using leads of the same level; The metal fiber content is not more than 20%, and the length L M The conventional fiber length L is 38mm to 51mm. N 32mm~114mm.

3. The flexible capacitor according to claim 1, It is characterized in that The conductive cross section is selected from one of copper sheet, conductive silver paste or conductive silver glue; The conductive section is located in the middle and head end sections of the yarn; The number of the conductive cross sections is n+1.

4. The flexible capacitor according to claim 1, It is characterized in that The lead wire is a connection wire drawn from the conductive cross section for easy testing; The lead is divided into a positive lead S 1 and negative lead S 2 ; Among the leads, leads of the same polarity are connected to each other; Preferably, the lead wire is at least one of pure copper wire, enameled wire, and insulated wire.

5. The flexible capacitor according to claim 2, It is characterized in that The overall diameter of the elongated cylinder is 1 mm to 5 mm; The total length L of the elongated cylinder Y >45mm; The volume mass of the slender cylinder is 0.65 g / cm 3 -1.00g / cm 3 .

6. The flexible capacitor according to claim 2, It is characterized in that The n segments are the number of segments, And n≥1.

7. The flexible capacitor according to claim 2, It is characterized in that The length of each segment is L; The length range of each segment is L M <L<2L M , which is used to avoid the phenomenon of no capacitance caused by the front and back of the metal fiber being connected to the conductive section or the metal fiber being misaligned.

8. The flexible capacitor according to claim 2, It is characterized in that The metal fiber has an electrical conductivity greater than 10 4 s / m metal fibers; The metal fiber is a metal fiber with an insulating layer on its surface; Preferably, the metal fiber with the surface coated with an insulating layer is at least one of stainless steel fiber, copper fiber, aluminum fiber, iron-nickel fiber, and surface silver-plated fiber that has been subjected to insulation treatment.

9. The flexible capacitor according to claim 2, It is characterized in that The conventional fibers are dielectric fibers that do not have conductive properties; Preferably, the conventional fiber is at least one of nylon, polyester, polypropylene, vinylon, chlorofiber, acrylic, spandex, cotton and wool fibers.

10. A method for preparing a flexible capacitor, It is characterized in that The flexible capacitor according to any one of claims 1 to 9 comprises: S1. Inserting the metal fiber blended yarn with a cylindrical interdigitated structure into n segments of cylindrical tubes of the same specifications to shape the yarn, so that the yarn is in close contact in the tube, leaving gaps between the segmented tubes to introduce the conductive cross section, and obtaining the main structure of the flexible capacitor; S2. Introduce conductive sections into the middle gap of the cylindrical tube and the outer section of the tube, and cure and bond at high temperature; S3. Connect leads to each conductive section and connect the leads of the same polarity to each other to obtain a flexible capacitor.

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