Omnibearing flexible sliding energy conversion system and full-printing preparation method

Abstract

The invention discloses an omni-directional flexible sliding energy conversion system and a full-printing preparation method, the system comprises a flexible substrate layer, an inner circle electrode containing a leading-out wire is uniformly deposited on the flexible substrate layer, an isolation layer is printed on the leading-out wire area of the inner circle electrode, and the isolation layer is printed on the leading-out wire area of the inner circle electrode. An outer ring electrode containing a leading-out wire is printed on the flexible substrate layer, wherein the outer ring electrode and the inner circle electrode are of an annular nested structure; coating and printing WPU / BaTiO3 composite ink on the flexible substrate layer and completely covering the inner circle electrode and the outer ring electrode to form a de-electron layer; and coating ink on the other flexible substrate layer to form an electronic layer. The electron-losing layer and the electron-gaining layer move relatively to cause an electrostatic induction phenomenon, the inner circle electrode and the outer ring electrode generate a potential difference, the potential difference causes movement of electrons to generate current, and displacement motion is converted into electric signals to be output. The system does not need to consume extra electric energy, can efficiently provide power support for wearable equipment, and has durability and reliability.

Description

Technical Field

[0001] The present invention belongs to the technical field of flexible electronic devices, and in particular relates to an omnidirectional flexible sliding energy conversion system and a full-printing preparation method. Background Art

[0002] With the rapid development of the Internet of Things, wearable devices and smart sensor networks, there is an increasing demand for efficient, sustainable and miniaturized energy conversion systems. However, these terminal devices usually rely on wires or batteries for independent power supply, resulting in complex wiring, frequent charging or battery replacement and other problems. Energy conversion systems can solve these problems to a certain extent. With their advantages such as low cost, simple structure and wide selection of materials, they are regarded as a potential solution to the energy problem of electronic terminals. However, traditional energy conversion systems still face challenges such as severe wear, low energy conversion efficiency and complex design and manufacturing, which limit their promotion in practical applications. Summary of the invention

[0003] The purpose of the present invention is to provide an omnidirectional flexible sliding energy conversion system and a fully printed preparation method, which does not require consumption of additional electrical energy, can efficiently provide power support for wearable devices, and has durability and reliability.

[0004] In order to achieve the above object, the present invention provides the following technical solutions:

[0005] A omnidirectional flexible sliding energy conversion system comprises a flexible substrate layer, an inner circular electrode with lead wires is uniformly deposited on the flexible substrate layer by a screen printing process, an insulating layer is printed on the lead wire region of the inner circular electrode, and an outer ring electrode with lead wires in a ring-shaped nested structure with the inner circular electrode is printed on the flexible substrate layer; WPU / BaTiO3 composite ink is coated and printed on the flexible substrate layer and completely covers the inner circular electrode and the outer ring electrode to form an electron loss layer; ink is coated on another flexible substrate layer to form an electron gain layer;

[0006] When the electron-losing layer and the electron-gaining layer are in relative contact and move, electrostatic induction occurs, and a potential difference is generated between the inner circular electrode and the outer ring electrode. The potential difference causes the movement of electrons and thus generates current, realizing the conversion of displacement motion into electrical signal output.

[0007] A fully printed preparation method of an omnidirectional flexible sliding energy conversion system comprises the following steps:

[0008] Step 1: Design the inner and outer ring nested electrode structure and the patterned screen printing plate of the electrode layer and the insulation layer, cut the flexible substrate layer, and remove the dust and impurities on the surface;

[0009] Step 2: Use the screen printing plate made in step 1 to print conductive ink on the flexible substrate layer according to the set inner and outer ring nested electrode structure to obtain an inner circular electrode with lead wires. After printing, place it on a hot plate for drying and annealing.

[0010] Step 3: depositing dielectric ink on the lead-out area of ​​the inner circular electrode by screen printing to form an insulating layer, and drying and annealing on a hot stage;

[0011] Step 4: Position the inner circular electrode, and then cover the inner circular electrode with conductive ink by screen printing to print the outer ring electrode with lead wires, and then dry and anneal on a hot plate to complete the preparation of the planarized annular nested electrode;

[0012] Step 5: Cover the inner circular electrode and the outer ring electrode with water-based polyurethane / barium titanate (WPU / BaTiO3) composite ink by coating and printing to form an electron-loss layer, and then place it on a hot plate for drying and annealing. Subsequently, functional polymer ink is coated on another flexible substrate layer to form an electron-gaining layer, and then dried and annealed to complete the preparation of the all-round flexible sliding energy conversion system.

[0013] Furthermore, in step 1, the screen printing plate has a mesh count of 150 to 200 l / in, and a screen spacing of 2 to 3 mm; the inner circle diameter of the annular nested electrode structure is 4 cm, and the outer ring width is 3 cm; the flexible substrate layer is one of a polypropylene (PP) plastic sheet, a polyimide (PI) plastic sheet, a polyethylene terephthalate (PET) plastic sheet, photo paper, digital proofing paper or white cardboard, and the flexible substrate layer is cut into a rectangle of 8×45 cm.

[0014] Furthermore, in step 1, the dust and impurities on the surface of the flexible base layer are removed by nitrogen pressure blowing.

[0015] Furthermore, the conductive ink in step 2 is one of conductive silver ink, conductive graphene ink or conductive copper ink.

[0016] Furthermore, in step 2, the conductive ink is printed at a pressure of 0.25-0.45 MPa, a printing speed of 8-10 cm / s, a drying and annealing temperature of 80-120°C, and a drying and annealing time of 20-30 min. 。

[0017] Furthermore, the material of the dielectric ink in step three is one of epoxy resin (EP), polyurethane (PU), polysiloxane (SI) or polyvinyl alcohol (PVA).

[0018] Furthermore, the drying and annealing in step 3 and step 4 is carried out at a temperature of 80 to 120° C. and for a time of 20 to 30 minutes.

[0019] Furthermore, the preparation process of the waterborne polyurethane / barium titanate (WPU / BaTiO3) composite ink described in step five is: take WPU and add 6% to 10% BaTiO3 by mass to mix, ultrasonically treat at room temperature for 1 hour, and then mechanically stir at a speed of 700 rpm for 12 hours to obtain the WPU / BaTiO3 composite ink; the functional polymer ink is one of fluorinated ethylene propylene (FEP) ink, polytetrafluoroethylene (PTFE) ink or polydimethylsiloxane (PDMS) ink.

[0020] Furthermore, the drying annealing in step 5 is performed at a temperature of 80 to 120° C. and for a time of 20 to 30 minutes.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] The electrode layer of the present invention adopts an annular nested structure, wherein the inner electrode is a solid circle and the outer electrode is an annular ring. When the electron-acquired layer slides tangentially along the outer ring electrode, a charge transfer phenomenon is induced, thereby forming a potential difference between the inner and outer ring electrodes. Driven by the potential difference, electrons flow from the outer ring electrode to the inner ring electrode, and the opposite direction is the direction of the current, thus realizing the conversion from mechanical energy to electrical energy. Through such continuous changes, reciprocating charge movement is realized, which is a complete AC output process. The electrode layer adopts an annular nested structure, and when the electron-acquired layer slides at any angle, it is tangential to the two electrodes, so that energy can be collected from multiple angles, achieving all-round energy conversion, without consuming additional electrical energy, and solving the problem of battery drive. At the same time, the flexible substrate layer is deformed without damage when subjected to external force, thereby improving its durability and reliability.

[0023] The electrode layer, insulating layer and electron gain and loss layer of the present invention are all prepared by printing. Specifically, conductive silver ink is first used to form a thin film by screen printing to serve as a planarized annular nested electrode layer; then the dielectric ink is made into a thin film by screen printing to serve as an insulating layer; then WPU / BaTiO3 composite ink is used for coating, and the obtained film serves as an electron loss layer; functional polymer ink is coated on another flexible substrate layer to form an electron gain layer. Each functional layer is deposited on a flexible substrate by full printing to form an integrated all-round flexible sliding energy conversion system. The preparation process is easy to integrate and can be easily combined with various flexible substrate materials (such as textiles, plastic films, etc.) to achieve customized requirements for a variety of application scenarios. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is the structural diagram of the all-round flexible sliding energy conversion system;

[0025] Figure 2 A fully printed preparation diagram for an all-around flexible sliding energy conversion system;

[0026] Figure 3 It is the plan design drawing of the all-round flexible sliding energy conversion system;

[0027] Figure 4 It is a schematic diagram of the working state of the omnidirectional flexible sliding energy conversion system;

[0028] Figure 5 Schematic diagram of the open circuit voltage of the omnidirectional flexible sliding energy conversion system before and after multi-angle energy collection and bending 500 times;

[0029] In the figure: 1-electron gaining layer; 2-electron losing layer; 3-outer ring electrode; 4-insulating layer; 5-inner circle electrode; 6-flexible base layer. DETAILED DESCRIPTION

[0030] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the present invention is described in detail below with reference to the accompanying drawings and specific embodiments.

[0031] like Figure 1 , 2 As shown, the omnidirectional flexible sliding energy conversion system described in this embodiment includes a flexible substrate layer 6, on which an inner circular electrode 5 with lead wires is uniformly deposited by screen printing, an insulating layer 4 is printed on the lead wire area of ​​the inner circular electrode 5, and an outer ring electrode 3 with lead wires in a ring-shaped nested structure with the inner circular electrode 5 is printed on the flexible substrate layer 6; WPU / BaTiO3 composite ink is coated and printed on the flexible substrate layer and completely covers the inner circular electrode 5 and the outer ring electrode 3 to form an electron-losing layer 2; ink is coated on another flexible substrate layer 6 to form an electron-gaining layer 1. Each functional layer is deposited on the flexible substrate by full printing to form an integrated omnidirectional flexible sliding energy conversion system, such as Figure 3 shown.

[0032] The working principle of the omnidirectional flexible sliding energy conversion system is as follows Figure 4 As shown, in the initial state, both the electron-gaining layer 1 and the electron-losing layer 2 are uncharged. When these two layers come into contact with each other, the following situation will occur: the electron-gaining layer 1 is negatively charged, the electron-losing layer 2 is positively charged, and the amount of positive and negative charges is equal. At this time, there is no potential difference between the inner circular electrode 5 and the outer ring electrode 3, so there is no directional movement of charge in the external circuit. This is state I.

[0033] Then, when the electron layer 1 starts to move to the right, the original charge balance between the inner circular electrode 5 and the outer ring electrode 3 is broken, which in turn causes electrostatic induction at the electrodes. This change causes a potential difference to be generated between the inner circular electrode 5 and the outer ring electrode 3. Under the action of the potential difference, electrons will flow from the outer ring electrode 3 to the inner circular electrode 5 along the external circuit, and the opposite direction is the direction of the current, which is state II.

[0034] As the electron-acquired layer continues to move until it moves to the right edge of the outer ring electrode 3, the entire system will once again establish a state of electrostatic equilibrium, and the external circuit will return to a state where there is no directional movement of charges. On the contrary, in the process of changing from state III to state VI, the flow of electrons is from the outer ring electrode 3 to the inner circle electrode 5. In other words, the current flows from the inner circle electrode 5 to the outer ring electrode 3. Through such continuous changes, reciprocating charge movement is achieved, and this complete process is the AC output process of the all-round flexible sliding energy conversion system.

[0035] Printing preparation method:

[0036] Embodiment 1: A printing preparation method of an omnidirectional flexible sliding energy conversion system comprises the following steps:

[0037] Step 1: Design an electrode structure with inner and outer rings nested, where the inner diameter is 4 cm and the outer width is 3 cm; design a patterned screen printing plate for the electrode layer and the insulating layer 4, the screen mesh number of the screen printing plate is 150l / in, and the screen spacing is 3mm; select digital proofing paper as the flexible base layer 6, cut it into a rectangle of 8×45 cm, and use nitrogen pressure blowing to remove dust and impurities on the paper surface;

[0038] Step 2: Use the screen printing plate prepared in step 1 to print conductive silver ink on digital proofing paper at a printing speed of 10 cm / s and a printing pressure of 0.25 MPa according to the set inner and outer ring nested electrode structure to obtain an inner circular electrode 5 with lead wires. After printing is completed, place it on a 120° C. hot plate for drying and annealing for 20 minutes;

[0039] Step 3: depositing epoxy resin dielectric ink on the lead-out area of ​​the inner circular electrode 5 by screen printing to form an insulating layer 4, and drying and annealing on a hot plate at 120° C. for 20 minutes;

[0040] Step 4: Position the inner circular electrode 5, and then cover the inner circular electrode 5 with conductive silver ink by screen printing to print the outer ring electrode 3 with lead wires, and then dry and anneal on a hot plate at 120°C for 20 minutes to complete the preparation of the planarized annular nested electrode;

[0041] Step 5: Take 2g of WPU and add 6% BaTiO3 by weight to mix, ultrasonically treat at room temperature for 1h, and then mechanically stir at 700rpm for 12h to obtain WPU / BaTiO3 composite ink. The WPU / BaTiO3 composite ink is coated and printed by a wire rod coater to cover the inner circular electrode 5 and the outer ring electrode 3 to form an electron-loss layer 2, and then placed on a 120℃ hot stage for drying and annealing for 20min. Subsequently, FEP ink is coated on another digital proofing paper to form an electron-gaining layer 1, and placed on a 120℃ hot stage for drying and annealing for 20min to complete the preparation of the all-round flexible sliding energy conversion system.

[0042] Embodiment 2: A printing preparation method of an omnidirectional flexible sliding energy conversion system comprises the following steps:

[0043] Step 1: Design an electrode structure with inner and outer rings nested, where the inner diameter is 4 cm and the outer width is 3 cm; design a patterned screen printing plate for the electrode layer and the insulating layer 4, the screen mesh number of the screen printing plate is 200l / in, and the screen spacing is 2mm; select a polypropylene (PP) plastic sheet as the flexible substrate layer 6, cut it into a rectangle of 8×45 cm, and use nitrogen pressure blowing to remove dust and impurities on the surface of the paper;

[0044] Step 2: Using the screen printing plate prepared in step 1, according to the set inner and outer ring nested electrode structure, a conductive graphene ink is printed on a polypropylene (PP) plastic sheet at a printing speed of 8 cm / s and a printing pressure of 0.35 MPa to obtain an inner circular electrode 5 with lead wires. After printing is completed, it is placed on a hot plate at 80° C. for drying and annealing for 30 minutes;

[0045] Step 3: depositing polyurethane dielectric ink on the lead-out area of ​​the inner circular electrode 5 by screen printing to form an insulating layer 4, and drying and annealing on a hot plate at 80°C for 30,im;

[0046] Step 4: Position the inner circular electrode 5, and then cover the inner circular electrode 5 with conductive graphene ink by screen printing to print the outer ring electrode 3 with lead wires, and then dry and anneal on a hot plate at 80°C for 30 minutes to complete the preparation of the planarized annular nested electrode;

[0047] Step 5: Take 2g of WPU and add 8% BaTiO3 by weight to mix, ultrasonically treat at room temperature for 1h, and then mechanically stir at 700rpm for 12h to obtain WPU / BaTiO3 composite ink. The WPU / BaTiO3 composite ink is coated and printed by a wire rod coater to cover the inner circular electrode 5 and the outer ring electrode 3 to form an electron-loss layer 2, and then placed on a hot plate at 80°C for drying and annealing for 30min. Subsequently, PTFE ink is coated on another polypropylene (PP) plastic sheet to form an electron-gaining layer 1, and placed on a hot plate at 80°C for drying and annealing for 30min to complete the preparation of the all-round flexible sliding energy conversion system.

[0048] Embodiment 3: A printing preparation method of an omnidirectional flexible sliding energy conversion system comprises the following steps:

[0049] Step 1: Design an electrode structure with inner and outer rings nested, where the inner diameter is 4 cm and the outer width is 3 cm; design a patterned screen printing plate for the electrode layer and the insulating layer 4, the screen mesh number of the screen printing plate is 175l / in, and the screen spacing is 2.5mm; select a polyimide (PI) plastic sheet as the flexible substrate layer 6, cut it into a rectangle of 8×45 cm, and use nitrogen pressure blowing to remove dust and impurities on the paper surface;

[0050] Step 2: Using the screen printing plate prepared in step 1, according to the set inner and outer ring nested electrode structure, a printing speed of 9 cm / s and a printing pressure of 0.45 MPa are used to print conductive copper ink on a polyimide (PI) plastic sheet to obtain an inner circular electrode 5 with lead wires. After printing is completed, it is placed on a 100° C. hot plate for drying and annealing for 25 minutes;

[0051] Step 3: depositing polysiloxane dielectric ink on the lead-out area of ​​the inner circular electrode 5 by screen printing to form an insulating layer 4, and drying and annealing on a hot plate at 95°C for 26 minutes;

[0052] Step 4: Position the inner circular electrode 5, and then cover the inner circular electrode 5 with conductive copper ink by screen printing to print the outer ring electrode 3 with lead wires, and then dry and anneal on a hot plate at 90°C for 28 minutes to complete the preparation of the planarized annular nested electrode;

[0053] Step 5: Take 2g of WPU and add 10% of its mass of BaTiO3 to mix, ultrasonically treat at room temperature for 1h, and then mechanically stir at 700rpm for 12h to obtain WPU / BaTiO3 composite ink. The WPU / BaTiO3 composite ink is coated and printed by a wire rod coater to cover the inner circular electrode 5 and the outer ring electrode 3 to form an electron-loss layer 2, and then placed on a 110°C hot stage for drying and annealing for 22min. Subsequently, PDMS ink is coated on another polyimide (PI) plastic sheet to form an electron-gaining layer 1, and placed on a 110°C hot stage for drying and annealing for 24min to complete the preparation of the all-round flexible sliding energy conversion system.

[0054] Example 4: A printing preparation method for an omnidirectional flexible sliding energy conversion system:

[0055] The preparation method of this embodiment is different from that of Embodiment 1 only in that: in this embodiment, a polyethylene terephthalate (PET) plastic sheet is selected as the flexible base layer 6, and polyvinyl alcohol is selected as the material of the dielectric ink.

[0056] Example 5: A printing preparation method for an omnidirectional flexible sliding energy conversion system:

[0057] The preparation method of this embodiment is different from that of Embodiment 1 only in that: in this embodiment, photo paper is selected as the flexible base layer 6 .

[0058] Example 6: A printing preparation method for an omnidirectional flexible sliding energy conversion system:

[0059] The preparation method of this embodiment is different from that of Embodiment 1 only in that: in this embodiment, white cardboard is selected as the flexible base layer 6 .

[0060] Comparative Example 1: A printing preparation method for an omnidirectional flexible sliding energy conversion system:

[0061] The preparation method of this comparative example is different from that of Example 1 only in that: in this comparative example, 2 g of WPU is coated and printed by a wire rod coater to cover the electrode layer of the annular nested structure to form an electron-losing layer 2 .

[0062] Experimental part:

[0063] When the electron-acquired layer slides tangentially along the outer ring electrode, charge transfer occurs, and a potential difference is formed between the inner and outer ring electrodes, driving electrons to flow from the outer ring electrode to the inner ring electrode, thereby realizing the conversion of mechanical energy to electrical energy. The open circuit voltage, short circuit current and maximum output power of the omnidirectional flexible sliding energy conversion system obtained in Comparative Example 1 and Examples 1-3 were compared and measured, and the effects of different mass ratios of BaTiO3 on the system were analyzed, as shown in Table 1.

[0064] Table 1

[0065] <![CDATA[Addition amount of BaTiO3]]> Open circuit voltage / V Short circuit current / μA Maximum output power / μW 0％ 28.96 0.32 4.99 6％ 75 0.56 7.42 8％ 133.01 0.82 11.53 10％ 97.18 0.63 8.55

[0066] It can be seen that when BaTiO3 (0%) is not doped, the open circuit voltage and short circuit current of the system are 28.96V and 0.32μA respectively. With the addition of BaTiO3, the open circuit voltage and short circuit current under any ratio are higher than those of undoped WPU. This is because the waterborne polyurethane (WPU) has a weak ability to lose electrons, which affects the output performance of the system. Barium titanate (BaTiO3) is a dielectric material and can be used as a composite filler to significantly enhance the charge retention ability of the system. Therefore, the output performance of the omnidirectional sliding energy conversion system will be effectively improved by compounding BaTiO3 in the WPU matrix.

[0067] When the added mass of BaTiO3 is 8% of WPU, the open circuit voltage of the omnidirectional sliding energy conversion system is the maximum 133.01V, the short circuit current is 0.82μA, and the output power is 11.53μW, which is 2.3 times that of undoped BaTiO3 (4.99μW), showing the best output performance. When the added mass of BaTiO3 is 8% of WPU, the output performance is the best, so the omnidirectional output performance is tested by changing the sliding angle, such as Figure 5 As shown. At 0°, 45°, 90°, 135°, 180°, 225°, 270° and 315°, the open circuit voltage of the omnidirectional flexible sliding energy conversion system is 133.01, 132.49, 130.67, 141.46, 139.24, 132.42, 136.19 and 132.77V respectively; the short circuit current is 0.82, 0.81, 0.74, 0.88, 0.80, 0.80, 0.79, 0.79μA. In addition, the omnidirectional flexible sliding energy conversion system is inevitably subjected to repeated bending in application. In order to verify the output performance stability of the system after continuous bending, the omnidirectional flexible sliding energy conversion system was bent continuously for 500 times. The open circuit voltage finally measured was almost the same as that before the bending cycle test, which further confirmed the reliability between the printed film layers, so that the omnidirectional flexible sliding energy conversion system has good flexibility, durability and reliability.

Claims

1. An all-round flexible sliding energy conversion system, characterized in that: The invention comprises a flexible substrate layer (6), an inner circular electrode (5) containing lead wires is uniformly deposited on the flexible substrate layer (6) by a screen printing process, an insulating layer (4) is printed on the lead wire region of the inner circular electrode (5), and an outer ring electrode (3) containing lead wires in a ring-shaped nested structure with the inner circular electrode (5) is printed on the flexible substrate layer (6); WPU / BaTiO3 composite ink is coated and printed on the flexible substrate layer (6) to completely cover the inner circular electrode (5) and the outer ring electrode (3) to form an electron loss layer (2); and ink is coated on another flexible substrate layer (6) to form an electron gain layer (1); When the electron-losing layer (2) and the electron-gaining layer (1) contact and move with each other, an electrostatic induction phenomenon is triggered, and an electric potential difference is generated between the inner circular electrode (5) and the outer ring electrode (3). The electric potential difference causes the movement of electrons, thereby generating an electric current, and realizing the conversion of displacement movement into an electrical signal output.

2. A fully printed preparation method of the omnidirectional flexible sliding energy conversion system as claimed in claim 1, characterized in that: The following steps are involved: Step 1: Designing the patterned screen printing plates of the inner and outer annular nested electrode structures and the electrode layer and the insulating layer (4), cutting the flexible substrate layer (6), and removing dust and impurities from the surface; Step 2: Using the screen printing plate prepared in step 1, a conductive ink is printed on the flexible substrate layer (6) according to the set inner and outer ring nested electrode structure to obtain an inner circular electrode (5) with lead wires. After printing is completed, the electrode is placed on a hot plate for drying and annealing; Step 3: depositing dielectric ink on the lead-out area of ​​the inner circular electrode (5) by screen printing to form an insulating layer (4), and drying and annealing on a hot stage; Step 4: Position the inner circular electrode (5), and then cover the inner circular electrode (5) with conductive ink by screen printing to obtain an outer ring electrode (3) with lead wires, and then dry and anneal on a hot plate to complete the preparation of a planarized annular nested electrode; Step 5: The water-based polyurethane / barium titanate (WPU / BaTiO3) composite ink is coated and printed to cover the inner circular electrode (5) and the outer ring electrode (3) to form an electron-loss layer (2), which is then placed on a hot plate for drying and annealing. Subsequently, a functional polymer ink is coated on another flexible substrate layer (6) to form an electron-acquiring layer (1), which is then dried and annealed to complete the preparation of the all-round flexible sliding energy conversion system.

3. The fully printed preparation method of an omnidirectional flexible sliding energy conversion system according to claim 2 is characterized in that: Step 1: The screen printing plate has a mesh count of 150 to 200 l / in and a screen spacing of 2 to 3 mm; the inner circle diameter of the annular nested electrode structure is 4 cm and the outer circle width is 3 cm; the flexible substrate layer (6) is one of a polypropylene (PP) plastic sheet, a polyimide (PI) plastic sheet, a polyethylene terephthalate (PET) plastic sheet, photo paper, digital proofing paper or white cardboard, and the size of the flexible substrate layer (6) is cut into a rectangle of 8×45 cm.

4. The fully printed preparation method of an omnidirectional flexible sliding energy conversion system according to claim 2, characterized in that: Step 1: The flexible base layer (6) is cleaned of dust and impurities on the surface by nitrogen pressure blowing.

5. The fully printed preparation method of an omnidirectional flexible sliding energy conversion system according to claim 2, characterized in that: In step 2, the conductive ink is one of conductive silver ink, conductive graphene ink or conductive copper ink.

6. The fully printed preparation method of the omnidirectional flexible sliding energy conversion system according to claim 5, characterized in that: In step 2, the conductive ink is printed at a pressure of 0.25 to 0.45 MPa, a printing speed of 8 to 10 cm / s, a drying and annealing temperature of 80 to 120° C., and a drying and annealing time of 20 to 30 min.

7. The fully printed preparation method of an omnidirectional flexible sliding energy conversion system according to claim 2, characterized in that: In step 3, the material of the dielectric ink is one of epoxy resin (EP), polyurethane (PU), polysiloxane (SI) or polyvinyl alcohol (PVA).

8. The fully printed preparation method of an omnidirectional flexible sliding energy conversion system according to claim 2, characterized in that: The drying and annealing temperature in step 3 and step 4 is 80-120°C and the time is 20-30 minutes. 。 9. The fully printed preparation method of an omnidirectional flexible sliding energy conversion system according to claim 2, characterized in that: Step 5: The preparation process of the waterborne polyurethane / barium titanate (WPU / BaTiO3) composite ink is as follows: take WPU and add 6% to 10% BaTiO3 by mass to mix, ultrasonically treat at room temperature for 1 hour, and then mechanically stir at a speed of 700 rpm for 12 hours to obtain the WPU / BaTiO3 composite ink; The functional polymer ink is one of fluorinated ethylene propylene (FEP) ink, polytetrafluoroethylene (PTFE) ink or polydimethylsiloxane (PDMS) ink.

10. The fully printed preparation method of an omnidirectional flexible sliding energy conversion system according to claim 2, characterized in that: The drying annealing in step 5 is carried out at a temperature of 80 to 120° C. and for a time of 20 to 30 minutes.

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