A piezoelectric-magnetoelectric dual-mode vibration energy harvester and its manufacturing method

Abstract

The present invention discloses a piezoelectric-magnetoelectric dual-mode vibration energy harvester and a method for manufacturing the same, relating to the technical field of power generation equipment. The piezoelectric energy harvesting module includes a mass block, a plurality of first piezoelectric components, and two second piezoelectric components. The plurality of first piezoelectric components are arranged outside the mass block, and the two second piezoelectric components are respectively located above and below the mass block. Each first piezoelectric component and each second piezoelectric component are electrically connected to a piezoelectric energy harvesting circuit board. The magnetoelectric energy harvesting module includes two magnets and two induction coils, each magnet is respectively located at the ends of the mass block, each induction coil is electrically connected to the magnetoelectric energy harvesting circuit board, and an energy storage element is electrically connected to the piezoelectric energy harvesting circuit board and the magnetoelectric energy harvesting circuit board, respectively. The present invention improves the output energy density and energy harvesting efficiency of the energy harvester through the design of a multi-directional structure and the combination of piezoelectric and magnetoelectric energy harvesting modes. The invention has strong practicality and is convenient for wide application.

Description

Technical Field

[0001] The present invention relates to the technical field of power generation equipment, and in particular to a piezoelectric-magnetoelectric dual-mode vibration energy harvester and a manufacturing method thereof. Background Art

[0002] With the rapid development of microelectromechanical systems (MEMS) and wireless sensor networks (WSNs), wireless sensor systems have demonstrated significant potential for applications in monitoring ecological environments, equipment status, and traffic safety. Compared to wired monitoring methods, wireless sensors are not only convenient and cost-effective, but also address the wiring difficulties and installation location constraints of traditional monitoring systems. However, the power supply issue for wireless sensor systems continues to limit their further development. Currently, most wireless sensor nodes are powered by chemical batteries, which are not only difficult to recycle and prone to environmental pollution, but also have a short lifespan and require regular replacement. In recent years, energy harvesting technology, a novel technology that converts environmental energy such as solar energy, wind energy, and vibration energy into electrical energy, has become a research hotspot in many fields both domestically and internationally. In underground coal mines, machinery and equipment generate a significant amount of vibration energy during operation. Vibration energy harvesting technology, which converts this vibration energy into electrical energy, provides a new approach to achieving self-powered wireless sensor nodes and addressing the battery life issues of wireless sensor systems in underground coal mines.

[0003] In order to capture and utilize vibration energy in the environment, many researchers have proposed vibration energy harvesters with various structural styles. However, existing vibration energy harvesters generally have the following two problems: First, the energy harvester has strong directional selectivity and can only capture vibration energy in a single or specific direction. However, the vibration in the actual environment is multi-directional, and the capture ability of the energy harvester will be significantly reduced; Second, the energy capture mode of the energy harvester is relatively single, and it can only capture vibration energy through one of the conversion modes of piezoelectric conversion, magnetoelectric conversion or electrostatic conversion, resulting in low energy capture density and capture efficiency of the energy harvester, making it difficult to use in practical applications. Summary of the Invention

[0004] The purpose of the present invention is to provide a piezoelectric-magnetoelectric dual-mode vibration energy harvester and a manufacturing method thereof. By designing a multi-directional structure and combining the piezoelectric and magnetoelectric energy harvesting modes, the output energy density and energy harvesting efficiency of the energy harvester are improved to solve the problems and shortcomings of existing single-direction and single-mode energy harvesters. The invention has strong practicality and is convenient for wide application.

[0005] To achieve the above object, the present invention provides the following solutions:

[0006] The present invention provides a piezoelectric-magnetoelectric dual-mode vibration energy harvester, comprising a shell and a piezoelectric energy harvesting module, a magnetoelectric energy harvesting module, a piezoelectric energy harvesting circuit board, a magnetoelectric energy harvesting circuit board and an energy storage element arranged in the shell; the piezoelectric energy harvesting module comprises a mass block, a plurality of first piezoelectric components and two second piezoelectric components, the plurality of first piezoelectric components are arranged on the outside of the mass block, one end of each first piezoelectric component is connected to the shell, the other end of each first piezoelectric component is connected to the mass block, the two second piezoelectric components are respectively located above and below the mass block, and each first piezoelectric component and each second piezoelectric component are electrically connected to the piezoelectric energy harvesting circuit board; the magnetoelectric energy harvesting module comprises two magnets and Two induction coils, each magnet is located at both ends of the mass block, each induction coil is connected to a second piezoelectric component, each induction coil is electrically connected to the magnetoelectric energy harvesting circuit board, and the energy storage element is electrically connected to the piezoelectric energy harvesting circuit board and the magnetoelectric energy harvesting circuit board respectively. Movement of the mass block in any direction can stretch and compress the first piezoelectric component, thereby causing the first piezoelectric component to deform and output electrical energy. The up and down reciprocating motion of the two magnets can strike the two second piezoelectric components, causing the second piezoelectric components to be squeezed and output electrical energy. The reciprocating motion of the two magnets can change the magnetic flux passing through the induction coil and output an induced current.

[0007] Preferably, the outer shell includes an upper end cover, a shell and a lower end cover arranged in sequence, the shell is a hollow cylindrical shape, a partition is provided in the shell, a power generation compartment is provided between the upper end cover and the partition, the piezoelectric energy capture module and the magnetoelectric energy capture module are both located in the power generation compartment, a circuit placement compartment is provided between the partition and the lower end cover, the piezoelectric energy capture circuit board, the magnetoelectric energy capture circuit board and the energy storage element are all located in the circuit placement compartment.

[0008] Preferably, the upper end cover is provided with a wire outlet, the inner wall of the shell is provided with a wire guide groove, and the edge of the partition is provided with a wire threading port.

[0009] Preferably, the upper end cover and the lower end cover are respectively provided with a plurality of first through holes, and the top and bottom ends of the shell are correspondingly provided with a plurality of first screw holes, and the first screw passes through the first through holes of the upper end cover and the first screw holes at the upper end of the shell to realize the connection between the upper end cover and the shell, and the first screw passes through the first through holes of the lower end cover and the first screw holes at the lower end of the shell to realize the connection between the lower end cover and the shell.

[0010] Preferably, a second screw hole is provided on the inner wall of the shell, and a second through hole and a third through hole are respectively provided at both ends of the first piezoelectric component, the second screw hole corresponds to the second through hole, and the second screw passes through the second through hole and the second screw hole to realize a movable connection between one end of the first piezoelectric component and the shell, and a third screw hole is provided on the side of the mass block, the third screw hole corresponds to the third through hole, and the third screw passes through the third through hole and the third screw hole to realize a movable connection between the other end of the first piezoelectric component and the mass block.

[0011] Preferably, the first piezoelectric component is arched, one end of the first piezoelectric component is movably connected to the mass block, and the other end of the first piezoelectric component is movably connected to the shell, and the first piezoelectric component includes an upper piezoelectric film, an arched beam and a lower piezoelectric film arranged in sequence.

[0012] Preferably, it also includes a coil winding post and a coil fixing seat, the induction coil is wound on the coil winding post, and the coil winding post is provided with a through hole for the magnet to pass through, the coil fixing seat is connected to the second piezoelectric component, the top and bottom ends of the coil winding post are respectively provided with a fourth through hole, and the two ends of the coil fixing seat are provided with a fourth screw hole corresponding to the fourth through hole, the coil fixing seat is provided with a first slot, the coil winding post can be inserted into the coil fixing seat along the first slot, and the fourth screw passes through the fourth through hole and the fourth screw hole to realize the connection between the coil winding post and the coil fixing seat.

[0013] Preferably, the second piezoelectric component is circular, and comprises a base copper sheet, a piezoelectric ceramic sheet and a buffer copper sheet arranged in sequence, and the buffer copper sheet is arranged close to the mass block.

[0014] Preferably, it also includes a circuit board fixing seat, which is connected to the shell, and both ends of the piezoelectric energy harvesting circuit board and the magnetoelectric energy harvesting circuit board are provided with fifth through holes, and both ends of the circuit board fixing seat are provided with fifth screw holes corresponding to the fifth through holes. The circuit board fixing seat is provided with a second slot, and both the piezoelectric energy harvesting circuit board and the magnetoelectric energy harvesting circuit board can be inserted into the circuit board fixing seat along the second slot. The fifth screw passes through the fifth through hole of the piezoelectric energy harvesting circuit board and the fifth screw hole of the circuit board fixing seat to realize the connection between the piezoelectric energy harvesting circuit board and the circuit board fixing seat, and the fifth screw passes through the fifth through hole of the magnetoelectric energy harvesting circuit board and the fifth screw hole of the circuit board fixing seat to realize the connection between the magnetoelectric energy harvesting circuit board and the circuit board fixing seat.

[0015] The present invention also provides a method for manufacturing the piezoelectric-magnetoelectric dual-mode vibration energy harvester, comprising the following steps:

[0016] Step 1: Weld two magnets to the center of the upper and lower surfaces of the mass block respectively to complete the fixed connection between the magnets and the mass block;

[0017] Step 2: Evenly adhere the upper and lower piezoelectric films to both sides of the arched beam, and then use a fixture to clamp and solidify them to complete the production of the first piezoelectric component. Then, connect one end of the first piezoelectric component to the mass block and the other end of the first piezoelectric component to the housing to complete the installation of the first piezoelectric component.

[0018] Step 3: Evenly apply the conductive silver paste to the upper and lower surfaces of the piezoelectric ceramic sheet, then attach the base copper sheet and the buffer copper sheet to the upper and lower surfaces of the piezoelectric ceramic sheet respectively, and then use a fixture to clamp and solidify them to complete the production of the second piezoelectric component. Then, connect the two second piezoelectric components to the upper end cover and the partition respectively to complete the installation of the second piezoelectric component;

[0019] Step 4: Wrap the copper wire around the coil winding post to form an induction coil, then fix the coil winding post to the coil fixing base, and then fix the coil fixing base to the surface of the second piezoelectric component to complete the installation of the induction coil;

[0020] Step 5: Fix the piezoelectric energy harvesting circuit board and the magnetoelectric energy harvesting circuit board to the circuit board fixing base, and then fix the circuit board fixing base to the lower end cover to complete the installation of the piezoelectric energy harvesting circuit board and the magnetoelectric energy harvesting circuit board;

[0021] Step six: Finally, the upper end cover and the lower end cover are fixedly connected to the shell to complete the assembly and production of the piezoelectric-magnetoelectric dual-mode vibration energy harvester.

[0022] Compared with the prior art, the present invention has achieved the following technical effects:

[0023] The present invention has a reasonable design and a simple structure. It converts the vibration energy generated by the operation of the machine equipment into electrical energy by setting a piezoelectric energy capture module and a magnetoelectric energy capture module, and then processes the collected electrical energy into stable direct current that can be used by setting a piezoelectric energy capture circuit board and a magnetoelectric energy capture circuit board, thereby realizing the recovery and utilization of vibration energy, turning waste into treasure, and having high practical value and good promotion prospects.

[0024] The piezoelectric energy harvesting module in the present invention is provided with two piezoelectric components with different power generation forms, namely a first piezoelectric component and a second piezoelectric component. The first piezoelectric component outputs electrical energy through stretching and contraction deformation, and the second piezoelectric component outputs electrical energy through extrusion deformation. The joint output of the two piezoelectric components significantly improves the energy harvesting efficiency of the piezoelectric energy harvesting module.

[0025] The present invention is provided with a mass block and a magnet, and the two are combined. Through the reciprocating motion of the combined structure of the mass block and the magnet, the coupling of the piezoelectric energy harvesting module and the magnetoelectric energy harvesting module is cleverly realized, making the overall structure of the piezoelectric-magnetoelectric dual-mode vibration energy harvester more compact, and the energy density and energy harvesting efficiency are higher, which is conducive to the miniaturized application of the energy harvester.

[0026] The piezoelectric energy harvesting module in the present invention is provided with a first piezoelectric component centered on a mass block. Through the coordinated cooperation between the mass block and the first piezoelectric component, vibration energy in multiple directions of the outside world can be collected, effectively overcoming the problems of strong directional selectivity and low energy collection efficiency of traditional unidirectional energy harvesters. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0028] Figure 1 Schematic diagram of the cross-section of the piezoelectric-magnetoelectric dual-mode vibration energy harvester of the present invention;

[0029] Figure 2 2 is a schematic structural diagram of a cross section of the piezoelectric-magnetoelectric dual-mode vibration energy harvester according to the present invention from another angle;

[0030] Figure 3 Schematic diagram of the shell, upper end cover and lower end cover of the present invention;

[0031] Figure 4 is an exploded schematic diagram of the first piezoelectric component and the mass block in the present invention;

[0032] Figure 5 Schematic diagram of the exploded view of the coil winding column and the coil fixing seat in the present invention;

[0033] Figure 6 This is an exploded schematic diagram of the piezoelectric energy harvesting circuit board, the magnetoelectric energy harvesting circuit board, and the circuit board fixing seat in the present invention;

[0034] Figure 7 Schematic diagram of the structure of the second piezoelectric component in the present invention;

[0035] Figure 8 This is a flowchart of the working process of the piezoelectric-magnetoelectric dual-mode vibration energy harvester in the present invention;

[0036] Figure 9 A flowchart of a method for manufacturing a piezoelectric-magnetoelectric dual-mode vibration energy harvester according to the present invention;

[0037] In the figure: 1-wire outlet; 2-upper end cover; 3-generating chamber; 4-housing; 5-upper piezoelectric film; 6-arched beam; 7-lower piezoelectric film; 8-threading port; 9-partition; 10-circuit storage chamber; 11-piezoelectric energy-harvesting circuit board; 12-lower end cover; 13-magnetoelectric energy-harvesting circuit board; 14-energy storage element; 15-circuit board fixing seat; 16-base copper sheet; 17-piezoelectric ceramic sheet; 18-buffer copper sheet; 19-copper wire; 20-coil winding Column; 21-coil fixing seat; 22-mass block; 23-magnet; 24-lead groove; 25-first screw; 26-first through hole; 27-first screw hole; 28-second screw hole; 29-second through hole; 30-second screw; 31-third screw; 32-third through hole; 33-third screw hole; 34-fourth screw; 35-fourth through hole; 36-fourth screw hole; 37-fifth screw; 38-fifth through hole; 39-fifth screw hole. DETAILED DESCRIPTION

[0038] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] The purpose of the present invention is to provide a piezoelectric-magnetoelectric dual-mode vibration energy harvester and a manufacturing method thereof. By designing a multi-directional structure and combining the piezoelectric and magnetoelectric energy harvesting modes, the output energy density and energy harvesting efficiency of the energy harvester are improved to solve the problems and shortcomings of existing single-direction and single-mode energy harvesters. The invention has strong practicality and is convenient for wide application.

[0040] 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 further described in detail below with reference to the accompanying drawings and specific embodiments.

[0041] Example 1

[0042] like Figures 1-8As shown: This embodiment provides a piezoelectric-magnetoelectric dual-mode vibration energy harvester, including a shell and a piezoelectric energy harvesting module, a magnetoelectric energy harvesting module, a piezoelectric energy harvesting circuit board 11, a magnetoelectric energy harvesting circuit board 13 and an energy storage element 14 arranged in the shell; the piezoelectric energy harvesting module includes a mass block 22, a plurality of first piezoelectric components and two second piezoelectric components, the plurality of first piezoelectric components are arranged on the outside of the mass block 22, one end of each first piezoelectric component is connected to the shell, the other end of each first piezoelectric component is connected to the mass block 22, the two second piezoelectric components are respectively located above and below the mass block 22, and each first piezoelectric component and each second piezoelectric component are electrically connected to the piezoelectric energy harvesting circuit board 11; the magnetoelectric energy harvesting module includes two magnets 23 and two induction coils, each magnet 23 is respectively located on the upper surface and the lower surface of the mass block 22, and each induction coil The coils are respectively connected to a second piezoelectric component, each induction coil is electrically connected to the magnetoelectric energy harvesting circuit board 13, the energy storage element 14 is integrated on the piezoelectric energy harvesting circuit board 11 and the magnetoelectric energy harvesting circuit board 13, and the energy storage element 14 is respectively electrically connected to the piezoelectric energy harvesting circuit board 11 and the magnetoelectric energy harvesting circuit board 13. The mass block 22 and the magnet 23 are the two excitation sources for the piezoelectric energy harvesting module and the magnetoelectric energy harvesting module to perform energy harvesting work. The movement of the mass block 22 in any direction can stretch and compress the first piezoelectric component, thereby causing the first piezoelectric component to deform and output electrical energy. The up and down reciprocating motion of the two magnets 23 can hit the two second piezoelectric components, thereby causing the second piezoelectric components to be squeezed and output electrical energy. The reciprocating motion of the two magnets 23 can change the magnetic flux passing through the induction coil and output induced current to generate electrical energy.

[0043] Specifically, in this embodiment, the outer shell includes an upper end cover 2, a shell body 4 and a lower end cover 12 arranged in sequence. The upper end cover 2 and the lower end cover 12 are both disc-shaped. The upper end cover 2 is provided with two wire outlets 1. The shell body 4 is hollow cylindrical. The inner wall of the shell body 4 is provided with four lead grooves 24. A partition 9 is provided in the shell body 4. The partition 9 and the shell body 4 are integrally formed. The edge of the partition 9 is provided with four wire threading holes 8. The power generation compartment 3 is located between the upper end cover 2 and the partition 9. The piezoelectric energy capture module and the magnetoelectric energy capture module are both located in the power generation compartment 3. The mass block 22 is located in the center of the power generation compartment 3. The circuit placement compartment 10 is located between the partition 9 and the lower end cover 12. The piezoelectric energy capture circuit board 11, the magnetoelectric energy capture circuit board 13 and the energy storage element 14 are all located in the circuit placement compartment 10. The output wires of the first piezoelectric component and the second piezoelectric component are introduced into the circuit placement compartment 10 below along the lead groove 24 of the shell 4, and are connected to the input end of the piezoelectric energy harvesting circuit board 11 in the circuit placement compartment 10. The output wires of the induction coil are also introduced into the circuit placement compartment 10 below along the lead groove 24 of the shell 4, and are connected to the input end of the magnetoelectric energy harvesting circuit board 13 in the circuit placement compartment 10. The piezoelectric energy harvesting circuit board 11 and the magnetoelectric energy harvesting circuit board 13 respectively process the electric energy collected by the piezoelectric energy harvesting module and the magnetoelectric energy harvesting module, and store the processed electric energy in the energy storage element 14. The wires are then led out from the output ends of the piezoelectric energy harvesting circuit board 11 and the magnetoelectric energy harvesting circuit board 13 and pass through the wire threading port 8 of the partition 9, and finally led out from the wire outlet 1 of the upper end cover 2 along the lead groove 24 of the shell 4 to the outside of the shell 4.

[0044] In this embodiment, Figure 3 As shown, the upper end cover 2 and the lower end cover 12 are respectively provided with a plurality of first through holes 26, and the top and bottom ends of the shell 4 are correspondingly provided with a plurality of first screw holes 27. The first screws 25 pass through the first through holes 26 of the upper end cover 2 and the first screw holes 27 at the upper end of the shell 4 to realize the connection between the upper end cover 2 and the shell 4, and the first screws 25 pass through the first through holes 26 of the lower end cover 12 and the first screw holes 27 at the lower end of the shell 4 to realize the connection between the lower end cover 12 and the shell 4.

[0045] In this embodiment, there are preferably four first piezoelectric components, the mass block 22 is a square mass block, and the four first piezoelectric components are distributed around the mass block 22. The first piezoelectric component is an arched piezoelectric component, one end of the first piezoelectric component is movably connected to the mass block 22, and the other end of the first piezoelectric component is movably connected to the shell 4. The first piezoelectric component includes an upper piezoelectric film 5, an arched beam 6 and a lower piezoelectric film 7 arranged in sequence.

[0046] In this embodiment, Figure 4As shown, a second screw hole 28 is formed on the inner wall of the housing 4, and a second through hole 29 and a third through hole 32 are formed at both ends of the first piezoelectric assembly, respectively. The second screw hole 28 corresponds to the second through hole 29. A second screw 30 passes through the second through hole 29 and the second screw hole 28 to achieve a movable connection between one end of the first piezoelectric assembly and the housing 4. A third screw hole 33 is formed on the side of the mass block 22. The third screw hole 33 corresponds to the third through hole 32. A third screw 31 passes through the third through hole 32 and the third screw hole 33 to achieve a movable connection between the other end of the first piezoelectric assembly and the mass block 22. In particular, the two ends of the first piezoelectric assembly are not locked, and a gap is left in the connection between the mass block 22 and the housing 4, allowing the first piezoelectric assembly to swing, thereby ensuring the freedom of the mass block 22 during lateral movement.

[0047] In this embodiment, Figure 5 As shown, it also includes a coil winding post 20 and a coil fixing seat 21. The induction coil is wound on the coil winding post 20, and the coil winding post 20 is provided with a through hole for the magnet 23 to pass through. The magnet 23 is a cylindrical magnet. The coil fixing seat 21 is connected to the second piezoelectric component. The top and bottom ends of the coil winding post 20 are respectively provided with fourth through holes 35. The two ends of the coil fixing seat 21 are provided with fourth screw holes 36 corresponding to the fourth through holes 35. The coil fixing seat 21 is provided with a first slot. The coil winding post 20 can be inserted into the coil fixing seat 21 along the first slot. The fourth screw 34 passes through the fourth through hole 35 and the fourth screw hole 36 to realize the connection between the coil winding post 20 and the coil fixing seat 21.

[0048] In this embodiment, Figure 6As shown, it also includes a circuit board fixing base 15, which is connected to the lower end cover 12. Fifth through holes 38 are provided at both ends of the piezoelectric energy harvesting circuit board 11 and the magnetoelectric energy harvesting circuit board 13. Fifth screw holes 39 corresponding to the fifth through holes 38 are provided at both ends of the circuit board fixing base 15. The circuit board fixing base 15 is provided with a second slot. Both the piezoelectric energy harvesting circuit board 11 and the magnetoelectric energy harvesting circuit board 13 can be inserted into the circuit board fixing base 15 along the second slot. The fifth screw 37 passes through the fifth through hole 38 of the piezoelectric energy harvesting circuit board 11 and the fifth screw hole 39 of the circuit board fixing base 15 to achieve the connection between the piezoelectric energy harvesting circuit board 11 and the circuit board fixing base 15. The fifth screw 37 passes through the fifth through hole 38 of the magnetoelectric energy harvesting circuit board 13 and the fifth screw hole 39 of the circuit board fixing base 15 to achieve the connection between the magnetoelectric energy harvesting circuit board 13 and the circuit board fixing base 15. In this embodiment, the piezoelectric energy-harvesting circuit board 11 is primarily used to rectify and filter the electrical energy collected by the piezoelectric energy-harvesting module. The magnetoelectric energy-harvesting circuit board 13 is primarily used to rectify and filter the electrical energy collected by the magnetoelectric energy-harvesting module. The energy storage element 14 is primarily used to store the electrical energy processed by the piezoelectric energy-harvesting circuit boards 11 and 13. Based on the power generation principle of the piezoelectric effect, the electrical signal output by the piezoelectric energy-harvesting module has the characteristics of high voltage and low current. Therefore, the piezoelectric energy-harvesting circuit board 11 uses the LTC3588 integrated chip, which has the advantages of low energy loss, stable output, and high efficiency. Based on the power generation principle of electromagnetic induction, the electrical signal output by the magnetoelectric energy-harvesting module has the characteristics of high current and low voltage. Therefore, the magnetoelectric energy-harvesting circuit board 13 uses the LTC3108 integrated chip, which has the advantages of low starting voltage, adjustable output energy, and a complete management system. The energy storage element 14 uses a supercapacitor, which has the advantages of large capacity, rapid charging, and no pollution.

[0049] In this embodiment, Figure 7 As shown, two second piezoelectric assemblies are located at the top and bottom of the power generation chamber 3, respectively. The second piezoelectric assemblies are circular and include a base copper sheet 16, a piezoelectric ceramic sheet 17, and a buffer copper sheet 18, which are arranged in that order. The buffer copper sheet 18 is located near the mass block 22. The buffer copper sheet 18 is used to cushion the impact of the piezoelectric ceramic sheet 17 in the middle layer, preventing it from breaking. The base copper sheet 16 is used to protect the piezoelectric ceramic sheet 17 in the middle layer and facilitate the lead-out of the wires.

[0050] The working process of the piezoelectric-magnetoelectric dual-mode vibration energy harvester of this embodiment is as follows: Figure 8As shown: the piezoelectric-magnetoelectric dual-mode vibration energy harvester is fixedly installed on the body surface of the machine equipment. When the machine equipment is working and generates vibration, the piezoelectric-magnetoelectric dual-mode vibration energy harvester installed on the body surface will also vibrate, and then the vibration is transmitted to the piezoelectric energy harvesting module and the magnetoelectric energy harvesting module in the power generation chamber 3, causing the mass block 22 and the magnet 23 to produce relative movement in multiple directions. The movement of the mass block 22 in any direction will stretch and compress the first piezoelectric component, thereby causing the upper piezoelectric film 5 and the lower piezoelectric film 7 of the first piezoelectric component to deform and output electrical energy. The up and down reciprocating motion of the two magnets 23 will hit the second piezoelectric component at the top and bottom of the power generation chamber 3, so that the piezoelectric ceramic piece 17 of the second piezoelectric component is squeezed and outputs electrical energy. The reciprocating motion of the magnet 23 will also cause the magnetic flux passing through the induction coil to change and output an induced current. The electric energy output by the first piezoelectric component and the second piezoelectric component is rectified and filtered by the piezoelectric energy harvesting circuit board 11 and then charged into the energy storage element 14 for storage. The electric energy output by the induction coil is also rectified and filtered by the magnetoelectric energy harvesting circuit board 13 and then charged into the energy storage element 14 for storage. Finally, the electric energy stored in the energy storage element 14 is led out from the outlet 1 of the upper end cover 2 by laying wires to power the microelectronic device.

[0051] This embodiment has a reasonable design and a simple structure. By setting a piezoelectric energy capture module and a magnetoelectric energy capture module, the vibration energy generated by the operation of the machine equipment is converted into electrical energy. Then, by setting a piezoelectric energy capture circuit board 11 and a magnetoelectric energy capture circuit board 13, the collected electrical energy is processed into stable direct current that can be used, thereby realizing the recovery and utilization of vibration energy, turning waste into treasure, and having high practical value and good promotion prospects.

[0052] The piezoelectric energy harvesting module in this embodiment is provided with two piezoelectric components with different power generation forms, namely a first piezoelectric component and a second piezoelectric component. The first piezoelectric component outputs electrical energy through stretching and contraction deformation, and the second piezoelectric component outputs electrical energy through extrusion deformation. The joint output of the two piezoelectric components significantly improves the energy harvesting efficiency of the piezoelectric energy harvesting module.

[0053] In this embodiment, a square mass block and a cylindrical magnet are provided and combined. Through the reciprocating motion of the combined structure of the square mass block and the cylindrical magnet, the coupling of the piezoelectric energy harvesting module and the magnetoelectric energy harvesting module is cleverly realized, making the overall structure of the piezoelectric-magnetoelectric dual-mode vibration energy harvester more compact, and the energy density and energy harvesting efficiency are higher, which is conducive to the miniaturized application of the energy harvester.

[0054] In this embodiment, the piezoelectric energy harvesting module is provided with four first piezoelectric components centered on a square mass block. Through the coordinated cooperation of the square mass block and the first piezoelectric component, vibration energy in multiple directions of the outside world can be collected, effectively overcoming the problems of strong directional selectivity and low energy collection efficiency of traditional unidirectional energy harvesters.

[0055] Example 2

[0056] like Figure 9 As shown: This embodiment provides a method for manufacturing the piezoelectric-magnetoelectric dual-mode vibration energy harvester of embodiment 1, comprising the following steps:

[0057] Step 1: Weld two magnets 23 to the center of the upper and lower surfaces of the mass block 22 respectively to complete the fixed connection between the magnets 23 and the mass block 22;

[0058] Step 2: Use silicone sealant to evenly adhere the upper piezoelectric film 5 and the lower piezoelectric film 7 to both sides of the arched beam 6, and then use a clamp to clamp and solidify them to complete the production of the four first piezoelectric components. Then, connect one end of the four first piezoelectric components to the mass block 22 through the third screw 31, and connect the other end of the first piezoelectric component to the housing 4 through the second screw 30 to complete the installation of the four first piezoelectric components.

[0059] Step 3: Evenly apply the conductive silver paste to the upper and lower surfaces of the piezoelectric ceramic sheet 17, and then attach the base copper sheet 16 and the buffer copper sheet 18 to the upper and lower surfaces of the piezoelectric ceramic sheet 17, respectively. Then, use a fixture to clamp and solidify them to complete the production of the two second piezoelectric components. Then, the two second piezoelectric components are respectively connected to the lower surface of the upper end cover 2 and the upper surface of the partition 9 to complete the installation of the second piezoelectric components;

[0060] Step 4: Wrap the two copper wires 19 around the two coil winding posts 20 to form two induction coils. Insert the coil winding posts 20 along the first slot of the coil fixing base 21 and secure them with the fourth screw 34. Then, secure the two coil fixing bases 21 to the surface of the second piezoelectric component by welding. This completes the installation of the two induction coils.

[0061] Step 5: Insert the piezoelectric energy harvesting circuit board 11 and the magnetoelectric energy harvesting circuit board 13 into the second slot of the circuit board holder 15 and secure them with the fifth screw 37. Then, secure the circuit board holder 15 to the upper surface of the lower end cover 12 to complete the installation of the piezoelectric energy harvesting circuit board 11 and the magnetoelectric energy harvesting circuit board 13.

[0062] Step six: Finally, the upper end cover 2 and the lower end cover 12 are fixedly connected to the housing 4 by the first screws 25 to complete the assembly and production of the piezoelectric-magnetoelectric dual-mode vibration energy harvester.

[0063] This specification uses specific examples to illustrate the principles and implementation methods of the present invention. The above examples are only intended to help understand the method and core concept of the present invention. At the same time, those skilled in the art will find that the specific implementation methods and application scopes may vary based on the concept of the present invention. In summary, the contents of this specification should not be construed as limiting the present invention.

Claims

1. A piezoelectric-magnetoelectric dual-mode vibration energy harvester, characterized in that: The invention comprises a shell and a piezoelectric energy harvesting module, a magnetoelectric energy harvesting module, a piezoelectric energy harvesting circuit board, a magnetoelectric energy harvesting circuit board and an energy storage element arranged in the shell; the piezoelectric energy harvesting module comprises a mass block, a plurality of first piezoelectric components and two second piezoelectric components, the plurality of first piezoelectric components are arranged on the outside of the mass block, one end of each first piezoelectric component is connected to the shell, the other end of each first piezoelectric component is connected to the mass block, the two second piezoelectric components are respectively located above and below the mass block, and each first piezoelectric component and each second piezoelectric component are electrically connected to the piezoelectric energy harvesting circuit board; the magnetoelectric energy harvesting module comprises two magnets and two induction coils, each of the magnets Iron is located at both ends of the mass block, each of the induction coils is connected to a second piezoelectric component, each of the induction coils is electrically connected to the magnetoelectric energy harvesting circuit board, and the energy storage element is electrically connected to the piezoelectric energy harvesting circuit board and the magnetoelectric energy harvesting circuit board, respectively. Movement of the mass block in any direction can stretch and compress the first piezoelectric component, thereby causing the first piezoelectric component to deform and output electrical energy. The up and down reciprocating motion of the two magnets can strike the two second piezoelectric components, causing them to be squeezed and output electrical energy. The reciprocating motion of the two magnets can cause the magnetic flux passing through the induction coils to change, thereby outputting an induced current. The first piezoelectric component is arched, one end of the first piezoelectric component is movably connected to the mass block, and the other end of the first piezoelectric component is movably connected to the housing, and the first piezoelectric component includes an upper piezoelectric film, an arched beam, and a lower piezoelectric film arranged in sequence; It also includes a coil winding post and a coil fixing seat, the induction coil is wound on the coil winding post, and the coil winding post is provided with a through hole for the magnet to pass through, the coil fixing seat is connected to the second piezoelectric component, the top and bottom ends of the coil winding post are respectively provided with fourth through holes, and both ends of the coil fixing seat are provided with fourth screw holes corresponding to the fourth through holes, the coil fixing seat is provided with a first slot, the coil winding post can be inserted into the coil fixing seat along the first slot, and a fourth screw passes through the fourth through hole and the fourth screw hole to realize the connection between the coil winding post and the coil fixing seat; The second piezoelectric component is circular and includes a base copper sheet, a piezoelectric ceramic sheet, and a buffer copper sheet which are arranged in sequence. The buffer copper sheet is arranged close to the mass block.

2. The piezoelectric-magnetoelectric dual-mode vibration energy harvester according to claim 1, characterized in that: The outer shell includes an upper end cover, a shell and a lower end cover arranged in sequence. The shell is in the shape of a hollow cylinder. A partition is provided in the shell. A power generation compartment is located between the upper end cover and the partition. The piezoelectric energy harvesting module and the magnetoelectric energy harvesting module are both located in the power generation compartment. A circuit placement compartment is located between the partition and the lower end cover. The piezoelectric energy harvesting circuit board, the magnetoelectric energy harvesting circuit board and the energy storage element are all located in the circuit placement compartment.

3. The piezoelectric-magnetoelectric dual-mode vibration energy harvester according to claim 2, characterized in that: The upper end cover is provided with a wire outlet, the inner wall of the shell is provided with a wire guide groove, and the edge of the partition is provided with a wire threading port.

4. The piezoelectric-magnetoelectric dual-mode vibration energy harvester according to claim 2, characterized in that: The upper end cover and the lower end cover are respectively provided with a plurality of first through holes, and the top and bottom ends of the shell are correspondingly provided with a plurality of first screw holes. The first screw passes through the first through holes of the upper end cover and the first screw holes at the upper end of the shell to realize the connection between the upper end cover and the shell, and the first screw passes through the first through holes of the lower end cover and the first screw holes at the lower end of the shell to realize the connection between the lower end cover and the shell.

5. The piezoelectric-magnetoelectric dual-mode vibration energy harvester according to claim 1, characterized in that: A second screw hole is provided on the inner wall of the shell, and a second through hole and a third through hole are respectively provided at both ends of the first piezoelectric component, the second screw hole corresponds to the second through hole, and the second screw passes through the second through hole and the second screw hole to realize a movable connection between one end of the first piezoelectric component and the shell, and a third screw hole is provided on the side of the mass block, the third screw hole corresponds to the third through hole, and the third screw passes through the third through hole and the third screw hole to realize a movable connection between the other end of the first piezoelectric component and the mass block.

6. The piezoelectric-magnetoelectric dual-mode vibration energy harvester according to claim 1, characterized in that: The present invention also includes a circuit board fixing seat, which is connected to the housing. Both ends of the piezoelectric energy harvesting circuit board and the magnetoelectric energy harvesting circuit board are provided with fifth through holes. Both ends of the circuit board fixing seat are provided with fifth screw holes corresponding to the fifth through holes. The circuit board fixing seat is provided with a second slot. Both the piezoelectric energy harvesting circuit board and the magnetoelectric energy harvesting circuit board can be inserted into the circuit board fixing seat along the second slot. The fifth screw passes through the fifth through hole of the piezoelectric energy harvesting circuit board and the fifth screw hole of the circuit board fixing seat to achieve the connection between the piezoelectric energy harvesting circuit board and the circuit board fixing seat. The fifth screw passes through the fifth through hole of the magnetoelectric energy harvesting circuit board and the fifth screw hole of the circuit board fixing seat to achieve the connection between the magnetoelectric energy harvesting circuit board and the circuit board fixing seat.

7. A method for manufacturing the piezoelectric-magnetoelectric dual-mode vibration energy harvester according to any one of claims 1 to 6, characterized in that: The following steps are involved: Step 1: Weld two magnets to the center of the upper and lower surfaces of the mass block respectively to complete the fixed connection between the magnets and the mass block; Step 2: Evenly adhere the upper and lower piezoelectric films to both sides of the arched beam, and then use a fixture to clamp and solidify them to complete the production of the first piezoelectric component. Then, connect one end of the first piezoelectric component to the mass block and the other end of the first piezoelectric component to the housing to complete the installation of the first piezoelectric component. Step 3: Evenly apply the conductive silver paste to the upper and lower surfaces of the piezoelectric ceramic sheet, then attach the base copper sheet and the buffer copper sheet to the upper and lower surfaces of the piezoelectric ceramic sheet respectively, and then use a fixture to clamp and solidify them to complete the production of the second piezoelectric component. Then, connect the two second piezoelectric components to the upper end cover and the partition respectively to complete the installation of the second piezoelectric component; Step 4: Wrap the copper wire around the coil winding post to form an induction coil, then fix the coil winding post to the coil fixing base, and then fix the coil fixing base to the surface of the second piezoelectric component to complete the installation of the induction coil; Step 5: Fix the piezoelectric energy harvesting circuit board and the magnetoelectric energy harvesting circuit board to the circuit board fixing base, and then fix the circuit board fixing base to the lower end cover to complete the installation of the piezoelectric energy harvesting circuit board and the magnetoelectric energy harvesting circuit board; Step six: Finally, the upper end cover and the lower end cover are fixedly connected to the shell to complete the assembly and production of the piezoelectric-magnetoelectric dual-mode vibration energy harvester.

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