Cross-shaped annular bistable electromagnetic energy collection device

Abstract

The invention provides a cross-shaped annular bistable electromagnetic energy collection device. The cross-shaped annular bistable electromagnetic energy collection device comprises a base, a first elastic piece, a second elastic piece, a mass block and an energy collection module. The base is used for receiving external excitation; the first elastic piece is of an annular structure and is provided with a first end part and a second end part which are oppositely arranged, and the first end part is connected to the base; the second elastic piece is of a semi-annular structure, the middle of the second elastic piece is connected with the second end, the two ends of the second elastic piece are connected to the base, and the second elastic piece and the first elastic piece form a bistable structure; the mass block is arranged at the second end part; the energy collection module comprises a permanent magnet assembly and a coil assembly which are magnetically coupled with each other, one of the permanent magnet assembly and the coil assembly is connected with the mass block, and the other one of the permanent magnet assembly and the coil assembly is connected with the base. According to the cross-shaped annular bistable electromagnetic energy collection device provided by the invention, efficient collection of low-frequency energy can be realized through the bistable structure.

Description

Technical Field

[0001] The present application relates to the field of energy harvesting technology, and in particular to a cross-ring bistable electromagnetic energy harvesting device. Background Art

[0002] Early research on vibration energy focused on linear dynamic harvesters, which cannot harvest energy in a wide operating frequency band, that is, they can only work effectively when the external excitation frequency is almost equal to the fundamental frequency of their dynamic system. However, under actual engineering conditions, structural vibration sources usually have a low frequency (<10Hz), low-frequency vibration energy density is low and the amplitude is small, so it is necessary to design a linear dynamic harvester with an extremely low natural frequency. However, the stiffness of these linear harvesters with extremely low natural frequencies is usually low, which will lead to insufficient load-bearing capacity of the linear harvester and unstable structure. In addition, in the case of non-resonant oscillation, the collection efficiency of this type of harvester will also drop rapidly. Summary of the invention

[0003] In order to solve at least one of the above problems, the present application provides a cross-ring bistable electromagnetic energy harvesting device, the cross-ring bistable electromagnetic energy harvesting device comprising:

[0004] A cross-ring bistable electromagnetic energy harvesting device, characterized in that it comprises:

[0005] A base, for receiving external excitation;

[0006] A first elastic member, wherein the first elastic member is an annular structure, the first elastic member has a first end and a second end that are oppositely arranged along a first direction, and the first end is connected to the base;

[0007] a second elastic member, wherein the second elastic member is a semi-annular structure, a middle portion of the second elastic member and the second end portion are connected to each other, two ends of the second elastic member are respectively connected to the base, and the second elastic member and the first elastic member form a bistable structure;

[0008] a mass block, the mass block being disposed at the second end;

[0009] An energy harvesting module, the energy harvesting module comprising a permanent magnet assembly and a coil assembly that are magnetically coupled to each other, one of the permanent magnet assembly and the coil assembly being interconnected with the mass block, and the other of the permanent magnet assembly and the coil assembly being connected to the base.

[0010] In some embodiments, the first elastic member is a circular ring, and the second elastic member is a semicircular ring.

[0011] In some embodiments, the first elastic member and the second elastic member have the same radius.

[0012] In some embodiments, projections of the second elastic member and the first elastic member in a direction from the first end to the second end are perpendicular to each other.

[0013] In some embodiments, the first elastic member and the second elastic member are metal elastic members.

[0014] In some embodiments, the weight of the mass block is configured to correspond to a lowest stiffness critical point in a force-displacement characteristic curve of the bistable structure and to correspond to a potential well bottom critical point on a side away from a potential energy zero point in a potential energy curve of the bistable structure.

[0015] In some embodiments, the radius of the first elastic member and the second elastic member is 0.12m-0.18m; the width of the first elastic member and the second elastic member is 0.02m-0.04m; the thickness of the first elastic member is 0.65mm-0.7mm, and the thickness of the second elastic member is 0.975mm-0.985mm.

[0016] In some embodiments, the mass weighs 12.6kg-13kg.

[0017] In some embodiments, the permanent magnet assembly includes a first magnet and a second magnet that are arranged opposite to each other and have opposite polarities, the direction from the first magnet to the second magnet is perpendicular to the direction from the first end to the second end, and the coil assembly includes a first coil, which is arranged between the first magnet and the second magnet.

[0018] In some embodiments, the permanent magnet assembly also includes a third magnet and a fourth magnet; the third magnet is arranged on the side of the first magnet away from the mass block and has an opposite polarity to the first magnet, and the fourth magnet is arranged on the side of the second magnet away from the mass block and has an opposite polarity to the second magnet; the coil assembly also includes a second coil and a third coil arranged in parallel with the first coil, the second coil is arranged on the side of the first magnet away from the second magnet, and the third coil is arranged on the side of the second magnet away from the first magnet.

[0019] The cross-ring bistable electromagnetic energy harvesting device provided by the present application has a first ring-shaped elastic member with positive stiffness, and a second semi-ring-shaped elastic member with negative stiffness. Through the geometric coupling of the first elastic member and the second elastic member, a bistable structure with nonlinear force-displacement characteristics is formed. The bistable structure has two stable potential energy wells. When the base receives external excitation, the system can move through inter-well motion. The bistable structure can realize large-amplitude mechanical vibration by using large-scale transition motion between potential energy wells. This large-scale transition motion between potential energy wells can generate electric power several times higher than that of the monostable structure during magnetic coupling, which significantly improves the conversion efficiency of kinetic energy to electric energy, and the device has high collection efficiency. In addition, the present application provides a mass block at the second end of the bistable structure. By adjusting the mass of the mass block, the bistable structure can be located in the potential energy well (i.e., the bottom of the potential well on the side away from the potential energy zero point) when not working, that is, the initial position of the energy collection device is located in the potential energy well. In this way, when the base is excited, only a small external excitation is needed to trigger the nonlinear response of the system, so that the bistable structure is more likely to produce cross-well motion under low-frequency energy excitation, thereby causing the coil assembly and the permanent magnet assembly to produce relative motion under low-frequency excitation. The coil assembly realizes voltage collection by cutting the magnetic flux lines, and finally realizes the collection of low-frequency energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0021] Figure 1 It is a structural schematic diagram of a cross-ring bistable electromagnetic energy harvesting device provided by an embodiment of the present invention;

[0022] Figure 2 It is a structural schematic diagram of a base, a first elastic member, a second elastic member and a mass block of a cross-ring bistable electromagnetic energy harvesting device provided by an embodiment of the present invention;

[0023] Figure 3 It is a structural schematic diagram of a base, a first elastic member, a second elastic member and a mass block of a cross-ring bistable electromagnetic energy harvesting device provided by an embodiment of the present invention;

[0024] Figure 4 is a force-displacement curve of a first elastic member of a cross-ring bistable electromagnetic energy harvesting device provided by an embodiment of the present invention;

[0025] Figure 5is a dynamic stiffness curve of a first elastic member of a cross-ring bistable electromagnetic energy harvesting device provided by an embodiment of the present invention;

[0026] Figure 6 is a force-displacement curve of a second elastic member of a cross-ring bistable electromagnetic energy harvesting device provided by an embodiment of the present invention;

[0027] Figure 7 is a dynamic stiffness curve of a second elastic member of a cross-ring bistable electromagnetic energy harvesting device provided in an embodiment of the present invention;

[0028] Figure 8 It is a force-displacement curve of a cross-ring structure composed of a first elastic member and a second elastic member of a cross-ring bistable electromagnetic energy harvesting device provided in an embodiment of the present invention;

[0029] Fig. 9 A bifurcation diagram of a cross-ring structure composed of a first elastic member and a second elastic member of a cross-ring bistable electromagnetic energy harvesting device provided in an embodiment of the present invention when the first elastic member and the second elastic member are set to different thicknesses;

[0030] Fig.10 This is a potential energy diagram of a cross-ring structure composed of a first elastic member and a second elastic member of a cross-ring bistable electromagnetic energy harvesting device provided by an embodiment of the present invention when the first elastic member and the second elastic member are set to different thicknesses.

[0031] Among them, the reference numerals in the figure are:

[0032] 10-base; 20-first elastic member; 30-second elastic member; 40-mass block; 50-energy collection module; 51-permanent magnet assembly; 511-first magnet; 512-second magnet; 513-third magnet; 514-fourth magnet; 52-coil assembly; 521-first coil; 522-second coil; 523-third coil. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0034] In the description of this application, "plurality" means at least two, such as two, three, etc., unless otherwise clearly defined. In this application, unless otherwise clearly defined and defined, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be directly connected, or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to the specific circumstances.

[0035] In the present application, unless otherwise clearly specified and limited, a first feature being “above” or “below” a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being “above”, “above”, and “above” a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being “below”, “below”, and “below” a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0036] In the description of this application, it should be understood that the terms "inside", "outside", "upper", "bottom", "front", "back" and the like indicate directions or positional relationships (if any) based on the attached Figure 1 The orientation or positional relationship shown is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0037] It should also be noted that, in the embodiments of the present application, the same figure mark is used to represent the same component or the same part. For the same parts in the embodiments of the present application, the figure may only mark one of the parts or components as an example. It should be understood that the figure mark also applies to other identical parts or components.

[0038] As wireless sensors, self-powered electronic devices, and micro-electromechanical systems are increasingly used in various engineering applications, traditional electrochemical batteries that power these devices have limited service life, require regular charging, and are chemically hazardous. A viable solution is to harvest energy directly from a sustainable environment, such as vibration energy. In recent years, people have actively explored various vibration-based energy harvesting technologies to achieve higher energy autonomy and work efficiency. Vibration-based energy harvesting technology is an attractive but complex topic that converts kinetic energy into electrical energy. Due to the sustainability and non-depletion of vibration energy in the environment, a variety of mechanisms have been widely studied to harvest vibration energy, including piezoelectric, electromagnetic, electrostatic, and triboelectric methods.

[0039] Early research on vibration energy focused on linear dynamic harvesters, which cannot harvest energy in a wide operating frequency band, that is, they can only work effectively when the external excitation frequency is almost equal to the fundamental frequency of their dynamic system. In actual engineering conditions, structural vibration sources usually have a low frequency (<10Hz), low-frequency vibration energy density is low and the amplitude is small, so it is necessary to design a linear dynamic harvester with an extremely low natural frequency, but such structures are bulky and susceptible to environmental interference, and the performance of such harvesters will also drop rapidly in the case of non-resonant oscillation.

[0040] See also Figures 1 to 3 In order to solve the above problems, the present application provides a cross-ring bistable electromagnetic energy harvesting device, which includes a base 10, a first elastic member 20, a second elastic member 30, a mass block 40 and an energy harvesting module 50. The base 10 is used to receive external excitation; the first elastic member 20 is an annular structure, and the first elastic member 20 has a first end and a second end that are arranged oppositely along a first direction, and the first end is connected to the base 10; the second elastic member 30 is a semi-annular structure, the middle part of the second elastic member 30 is connected to the second end, and the two ends of the second elastic member 30 are respectively connected to the base 10, and the second elastic member 30 and the first elastic member 20 form a bistable structure; the mass block 40 is arranged at the second end; the energy harvesting module 50 includes a permanent magnet assembly 51 and a coil assembly 52 that are magnetically coupled to each other, one of the permanent magnet assembly 51 and the coil assembly 52 is connected to the mass block 40, and the other of the permanent magnet assembly 51 and the coil assembly 52 is connected to the base 10.

[0041] The first elastic member 20 can be an annular structure such as a circular ring, an elliptical ring or other shapes. The first elastic member 20 can be made of a metal material, for example, copper, iron, aluminum, tin, silver, etc. The material of the first elastic member 20 can also be made of a non-metallic material, for example, high-density polyethylene (HDPE), polyhexamethylene adipamide (nylon-66), polypropylene (PP), epoxy resin containing Kevlar fiber (82 vol%), epoxy resin containing glass fiber (73.3 vol%), etc. When the first elastic member 20 is made of a metal material, it can be integrally formed by casting, or it can be formed by bending a metal sheet and then welding the head and tail. When the first elastic member 20 is made of a non-metallic material, it can be integrally formed by an injection molding process, or it can be formed by bending a sheet of the above non-metallic material and then bonding or heat melting the head and tail.

[0042] The second elastic member 30 can be a semi-circular ring, a semi-elliptical ring or other semi-annular structures. The second elastic member 30 can be made of the same or different materials as the first elastic member 20, and the second elastic member 30 can be made by the same or different processes as the first elastic member 20. The radius of the second elastic member 30 can be the same as or different from the radius of the first elastic member 20, the width of the second elastic member 30 can be the same as or different from the width of the first elastic member 20, and the thickness of the second elastic member 30 can be the same as or different from the radius of the first elastic member 20. It only needs that the radius, width and thickness dimensions of the second elastic member 30 match the radius, width and thickness dimensions of the first elastic member 20 respectively, and form a bistable structure with the first elastic member 20.

[0043] The mass block 40 is arranged at the second end. According to the force-displacement characteristic curve of the bistable structure and / or the potential energy curve of the bistable structure, a mass block 40 with an appropriate weight can be selected to make the bistable structure easier to switch states between the two stable states under low-frequency energy excitation. For example, the weight of the mass block 40 can be configured so that the bistable structure is located in the potential energy well when not working. For another example, the weight of the mass block 40 can be configured so that the bistable structure is located at the critical point at the bottom of the potential energy well when not working.

[0044] The energy harvesting module 50 can have various structures. It only needs that the coil assembly 52 and the permanent magnet assembly 51 can generate relative displacement. The structure of the energy harvesting module 50 in this embodiment is not uniquely limited.

[0045] The cross-ring bistable electromagnetic energy harvesting device provided in this embodiment has a first ring-shaped elastic member 20 with positive stiffness, and a second semi-ring-shaped elastic member 30 with negative stiffness. Through the geometric coupling of the first elastic member 20 and the second elastic member 30, a bistable structure with nonlinear force-displacement characteristics is formed. The bistable structure has two stable potential energy wells. When the base 10 receives external excitation, the system can move through inter-well motion. The bistable structure can realize large-scale mechanical vibration by using large-scale transition motion between potential energy wells. Such large-scale transition motion between potential energy wells can generate electric power several times higher than that of the monostable structure during magnetic coupling, which significantly improves the conversion efficiency of kinetic energy to electric energy, and the device has high collection efficiency. In addition, in this embodiment, a mass block 40 is arranged at the second end of the bistable structure. By adjusting the mass of the mass block 40, the bistable structure can be located in the potential energy well (i.e., the bottom of the potential well on the side away from the potential energy zero point) when not working, that is, the initial position of the energy collection device is located in the potential energy well. In this way, when the base 10 is excited, only a small external excitation is needed to trigger the nonlinear response of the system, so that the bistable structure is more likely to produce cross-well motion under low-frequency energy excitation, thereby causing the coil assembly 52 and the permanent magnet assembly 51 to produce relative motion under low-frequency excitation. The coil assembly 52 realizes voltage collection by cutting the magnetic flux lines, and finally realizes the collection of energy at a lower frequency.

[0046] In addition, compared with the linear collector with extremely low natural frequency in the related art, the cross-ring bistable electromagnetic energy harvesting device provided in this embodiment has better load-bearing capacity and more stable structure.

[0047] In some embodiments, the weight of the mass 40 is configured to correspond to a critical point at the bottom of the potential well on a side away from the potential energy zero point in the potential energy curve of the bistable structure.

[0048] It can be understood that when the weight of the mass block 40 is configured to correspond to the bottom critical point of the potential well on the side away from the potential energy zero point in the potential energy curve of the bistable structure, it means that the weight of the mass block makes the initial position of the energy harvesting device be at the bottom critical point of the potential energy well, or slightly deviate from the bottom critical point of the potential energy well.

[0049] In this embodiment, experiments have shown that when the initial position of the energy harvesting device is at the critical point at the bottom of the potential energy well, due to factors such as inertial amplification and resonance matching, a smaller external excitation can trigger the nonlinear response of the system, thereby improving the response sensitivity of the bistable state to external excitations, making it easier for the bistable structure to produce cross-well motion under low-frequency energy excitation, thereby making it easier to harvest low-frequency energy.

[0050] In some embodiments, the radius of the first elastic member 20 and the second elastic member 30 is 0.12m-0.18m, for example, 0.12m, 0.14m, 0.15m, 0.16m or 0.18m. The width of the first elastic member 20 and the second elastic member 30 is 0.02m-0.04m, for example, 0.02m, 0.025m, 0.03m, 0.035m or 0.04m; the thickness of the first elastic member 20 is 0.65mm-0.7mm, for example, 0.65mm, 0.67mm, 0.68mm or 0.69mm, etc., and the thickness of the second elastic member 30 is 0.975mm-0.985mm, for example, 0.975mm, 0.978mm, 0.98mm or 0.982mm, etc.

[0051] See also Figure 4 and Figure 5 , Figure 4 is a force-displacement curve of the first elastic member 20; Figure 5 is the dynamic stiffness curve of the first elastic member 20; Figure 4 and Figure 5 It can be seen that as the displacement x increases, the force f also increases, which indicates that when an external force is applied to the first elastic member 20 to cause it to displace, the first elastic member 20 will generate a force in the opposite direction of the external force to resist deformation, and the first elastic member 20 has a positive stiffness characteristic.

[0052] See also Figure 6 and Figure 7 , Figure 6 is the force-displacement curve of the second elastic member 30, Figure 7 is the dynamic stiffness curve of the second elastic member 30, from Figure 6 and Figure 7 It can be seen that in the displacement range of about 0m-0.1m, as the displacement x increases, the force f increases, at this time the ratio of force to displacement is positive, and the second elastic member 30 exhibits a positive stiffness characteristic; however, in the displacement range of about 0.1m-0.2m, as the displacement x increases, the force f decreases, and in this range, the second elastic member 30 exhibits a negative stiffness characteristic; when the displacement exceeds 0.2m, the force increases with the increase in displacement, and the second elastic member 30 again exhibits a positive stiffness characteristic.

[0053] See also Figure 8 , Figure 8 is a force-displacement curve of the cross-ring structure formed by the first elastic member 20 and the second elastic member 30, Figure 8The first elastic member 20 has a first thickness, and the second elastic member 30 has a second thickness. The second elastic member 30 maintains the second thickness, and the second thickness is between 0.65 mm and 0.7 mm. Based on the first thickness, the thickness of the first elastic member 20 is adjusted multiple times. Each time the thickness of the first elastic member 20 is adjusted, a force-displacement curve of a cross-ring structure approximated to Figure 8 is obtained. By solving the above-mentioned multiple force-displacement curves such as Figure 8 shown, a bifurcation diagram of Fig. 9 can be obtained. It can be seen from Fig. 9 that when the thickness of the first elastic member 20 is between 0.65 mm and 0.7 mm and the thickness of the first elastic member 20 is less than 0.99 m, the structure composed of the first elastic member 20 and the second elastic member 30 has two stable states (the same thickness corresponds to two stable displacement values), that is, the first elastic member 20 and the second elastic member 30 can form a stable bistable structure.

[0054] Please refer to Fig.10 , Fig.10 which is the potential energy diagram of the cross-ring structure composed of the first elastic member 20 and the second elastic member 30 when the first elastic member 20 and the second elastic member 30 are set to different thicknesses. It can be seen from Fig.10 that when the thickness of the first elastic member 20 is between 0.65 mm and 0.7 mm and the thickness of the second elastic member 30 is about 0.97 m, the potential barrier of the bistable structure is relatively high, and it is not easy for the bistable structure to generate cross-well motion. When the thickness of the second elastic member 30 is between 0.975 mm and 0.985 mm, the potential barrier of the bistable structure is relatively low, and the bistable structure can sensitively respond to the excitation of lower-frequency energy.

[0055] In summary, in this embodiment, by limiting the sizes of the first elastic member 20 and the second elastic member 30, the bistable structure can form two stable potential energy wells, and the potential barrier of the bistable structure can be made relatively low, so that the energy harvesting device can stably and sensitively respond to the excitation of lower-frequency energy.

[0056] In this embodiment, by limiting the radii, widths, and thicknesses of the first elastic member 20 and the second elastic member 30, the first elastic member 20 and the second elastic member 30 can form a bistable structure.

[0057] In some embodiments, the mass block 40 weighs 12.6 kg - 13 kg. Specifically, the weight of the mass block 40 can be 12.6 kg, 12.7 kg, 12.8 kg, or 13 kg, etc.

[0058] Please refer to Fig. 9It can be seen that when the mass block 40 is 12.8 kg, the cross-ring structure is compressed and deformed by 0.07 m. At this time, the gravity of the mass block 40 roughly corresponds to the critical point at the bottom of the potential well on the side away from the potential energy zero point in the potential energy curve of the bistable structure. The cross-ring bistable electromagnetic energy harvesting device can harvest energy at a resonant frequency of 1.172 Hz. With this arrangement, the bistable structure can jump under the excitation of lower-frequency energy, thereby realizing the harvesting of low-frequency energy.

[0059] See also Figures 1 to 3 In some embodiments, the first elastic member 20 is a circular ring, and the second elastic member 30 is a semicircular ring. In this way, the first elastic member 20 and the second elastic member 30 have regular structures and are easier to process, which can simplify the structure and processing difficulty of the cross-ring bistable electromagnetic energy harvesting device.

[0060] See also Figures 1 to 3 In some embodiments, the radius of the first elastic member 20 and the radius of the second elastic member 30 are the same. Such a configuration is beneficial to improving the mechanical symmetry, manufacturing efficiency and dynamic response consistency of the cross-ring bistable electromagnetic energy harvesting device.

[0061] See also Figures 1 to 3 In some embodiments, the projections of the second elastic member 30 and the first elastic member 20 in the direction from the first end to the second end are perpendicular to each other. With such an arrangement, when the first elastic member 20 and the second elastic member 30 move, mechanical interference is not likely to occur, which is conducive to improving the stability and reliability of low-frequency energy collection.

[0062] See also Figure 1 In some embodiments, the permanent magnet assembly 51 includes a first magnet 511 and a second magnet 512 that are arranged opposite to each other and have opposite polarities, and the direction from the first magnet 511 to the second magnet 512 is perpendicular to the direction from the first end to the second end, and the coil assembly 52 includes a first coil 521, and the first coil 521 is arranged between the first magnet 511 and the second magnet 512.

[0063] In this embodiment, the first magnet 511 to the second magnet 512 with opposite polarities and vertical arrangement and the first coil 521 set in the center are coordinated and designed in combination with the bistable dynamic characteristics, so that the cross-ring bistable electromagnetic energy harvesting device exhibits high conversion efficiency and wide-band response characteristics in a low-frequency, small-amplitude, multi-directional vibration environment.

[0064] See also Figure 1In some embodiments, the permanent magnet assembly 51 also includes a third magnet 513 and a fourth magnet 514; the third magnet 513 is arranged on the side of the first magnet 511 away from the mass block 40 and has a polarity opposite to that of the first magnet 511, and the fourth magnet 514 is arranged on the side of the second magnet 512 away from the mass block 40 and has a polarity opposite to that of the second magnet 512; the coil assembly 52 also includes a second coil 522 and a third coil 523 arranged in parallel with the first coil 521, the second coil 522 is arranged on the side of the first magnet 511 away from the second magnet 512, and the third coil 523 is arranged on the side of the second magnet away from the first magnet 511.

[0065] In this embodiment, the first magnet 511, the second magnet 512, the third magnet 513 and the fourth magnet 514 are superimposed to form a magnetic field, and the three parallel first coils 521, the second coils 522 and the third coils 523 are used to simultaneously cut the magnetic flux lines in the magnetic field of the permanent magnet assembly 51, so that the voltages of the first coil 521, the second coil 522 and the third coil 523 can be collected simultaneously. With the above structure, when the radius of the first elastic member 20 and the second elastic member 30 is 0.15m, the width is 0.03m, the thickness of the first elastic member 20 is 0.68m, and the thickness of the second elastic member 30 is 0.98m, the first coil 521, the second coil 522 and the third coil 523 can collect a voltage of 600mv, thereby realizing efficient collection of low-frequency energy.

[0066] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A cross-ring bistable electromagnetic energy harvesting device, characterized in that: include: A base, for receiving external excitation; A first elastic member, wherein the first elastic member is an annular structure, the first elastic member has a first end and a second end that are oppositely arranged along a first direction, and the first end is connected to the base; a second elastic member, wherein the second elastic member is a semi-annular structure, a middle portion of the second elastic member and the second end portion are connected to each other, two ends of the second elastic member are respectively connected to the base, and the second elastic member and the first elastic member form a bistable structure; a mass block, the mass block being disposed at the second end; An energy harvesting module, the energy harvesting module comprising a permanent magnet assembly and a coil assembly that are magnetically coupled to each other, one of the permanent magnet assembly and the coil assembly being interconnected with the mass block, and the other of the permanent magnet assembly and the coil assembly being connected to the base.

2. The cross-ring bistable electromagnetic energy harvesting device according to claim 1, characterized in that: The first elastic member is a circular ring, and the second elastic member is a semicircular ring.

3. The cross-ring bistable electromagnetic energy harvesting device according to claim 1, characterized in that: The first elastic member and the second elastic member have the same radius.

4. The cross-ring bistable electromagnetic energy harvesting device according to claim 1, characterized in that: Projections of the second elastic member and the first elastic member in a direction from the first end portion to the second end portion are perpendicular to each other.

5. The cross-ring bistable electromagnetic energy harvesting device according to claim 1, characterized in that: The first elastic member and the second elastic member are metal elastic members.

6. The cross-ring bistable electromagnetic energy harvesting device according to claim 1, characterized in that: The mass block is configured to correspond to a critical point at the bottom of a potential well on a side away from a potential energy zero point in a potential energy curve of the bistable structure.

7. The cross-ring bistable electromagnetic energy harvesting device according to claim 1, characterized in that: The radius of the first elastic member and the second elastic member is 0.12m-0.18m; the width of the first elastic member and the second elastic member is 0.02m-0.04m; the thickness of the first elastic member is 0.65mm-0.7mm, and the thickness of the second elastic member is 0.975mm-0.985mm.

8. The cross-ring bistable electromagnetic energy harvesting device according to claim 7, characterized in that: The mass block weighs 12.6kg-13kg.

9. The cross-ring bistable electromagnetic energy harvesting device according to any one of claims 1 to 8, characterized in that: The permanent magnet assembly includes a first magnet and a second magnet that are arranged opposite to each other and have opposite polarities, and the direction from the first magnet to the second magnet is perpendicular to the direction from the first end to the second end. The coil assembly includes a first coil, and the first coil is arranged between the first magnet and the second magnet.

10. The cross-ring bistable electromagnetic energy harvesting device according to claim 9, characterized in that: The permanent magnet assembly also includes a third magnet and a fourth magnet; the third magnet is arranged on a side of the first magnet away from the mass block and has a polarity opposite to that of the first magnet, and the fourth magnet is arranged on a side of the second magnet away from the mass block and has a polarity opposite to that of the second magnet; the coil assembly also includes a second coil and a third coil arranged in parallel with the first coil, the second coil is arranged on a side of the first magnet away from the second magnet, and the third coil is arranged on a side of the second magnet away from the first magnet.

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