Wireless sensor network power supply system and self-powered monitoring device thereof

Abstract

The invention relates to the technical field of wearable equipment energy management, in particular to a wireless sensor network power supply system and a self-powered monitoring device thereof, and the system comprises a flexible piezoelectric fiber array which is integrated in an insole pressure concentration area and is used for converting foot kinetic energy into electric energy; the resonance rectification circuit is connected with the piezoelectric fiber array and is used for adaptively matching gait frequency and realizing efficient energy capture; the hybrid energy storage system comprises a super capacitor and a solid-state thin film battery, the super capacitor is used for storing energy instantaneously, and the solid-state thin film battery is used for storing energy for a long time; and the dynamic power consumption control module is used for identifying and adjusting a power supply strategy based on the motion state, including entering a sleep mode in a static state and switching to a high-performance mode when the stride frequency is detected. The battery is suitable for the fields of diabetic foot monitoring, sports health, military individual equipment and the like, and solves the problems of short endurance, frequent replacement, poor high-temperature environment safety and the like of a traditional battery.

Description

Technical Field

[0001] The present invention relates to the technical field of energy management of wearable devices, and in particular to a wireless sensor network power supply system based on foot kinetic energy collection and a self-powered medical monitoring device thereof. Background Art

[0002] Existing wearable medical devices, such as diabetic smart shoes, are mostly powered by button batteries (e.g., CR2032), which have a maximum battery life of only 12.3 days. The external charging module also increases the thickness of the shoe (average 4.2mm). Furthermore, lithium batteries present a risk of thermal runaway in the enclosed environment of the foot (where temperatures can reach 45°C).

[0003] Therefore, existing wearable medical devices have the following main technical problems during use: 1. Short battery life: Traditional button batteries can only last 7-12 days in continuous monitoring mode and need to be replaced frequently.

[0004] 2. Size and safety issues: The external charging module makes the shoe bulky; the lithium battery has the risk of thermal runaway in the closed environment of the foot (temperature reaches 45°C).

[0005] 3. Energy waste: Diabetic patients take an average of 5,000 steps a day, and about 1.5J of foot kinetic energy is not recovered with each step. Summary of the Invention

[0006] The main purpose of this invention is to overcome the shortcomings of the existing technology by providing a wireless sensor network power supply system based on foot kinetic energy harvesting and a self-powered medical monitoring device. This system is suitable for applications such as diabetic foot monitoring, sports health, and military individual equipment, and addresses the issues of traditional batteries, such as short battery life, frequent replacement, and poor safety in high-temperature environments.

[0007] The technical solution adopted by the present invention to achieve its technical purpose is: a wireless sensor network power supply system, comprising: A flexible piezoelectric fiber array, integrated into the pressure-concentrated areas of the insole, is used to convert foot kinetic energy into electrical energy; a resonant rectifier circuit connected to the piezoelectric fiber array for adaptively matching the 2-8 Hz gait frequency and achieving efficient energy capture; A hybrid energy storage system comprising a supercapacitor and a solid-state thin-film battery, wherein the supercapacitor is used for instantaneous energy storage and the solid-state thin-film battery is used for long-term energy storage; The dynamic power consumption control module adjusts the power supply strategy based on motion state recognition, including entering μA-level sleep mode when stationary and switching to high-performance mode when the cadence is detected to be greater than 1Hz.

[0008] Flexible piezoelectric fiber array: Made of PVDF / BaTiO3 composite material, directly embedded in the insole to solve the problem of discomfort caused by traditional rigid piezoelectric materials.

[0009] Resonant rectifier circuit: Optimized for the human gait frequency range (2-8Hz) to prevent energy capture efficiency from decreasing with gait frequency fluctuations.

[0010] Hybrid energy storage system: Supercapacitors cope with instantaneous high power demands (such as Bluetooth transmission), and solid-state batteries provide stable battery life. The two work together to solve the defects of insufficient capacity or power of a single energy storage device.

[0011] Dynamic power consumption control: Gait detection is used to achieve intelligent power consumption reduction, reducing overall power consumption by approximately 62%.

[0012] Preferably, the flexible piezoelectric fiber array is composed of a PVDF / BaTiO3 composite material, wherein the mass ratio of PVDF to BaTiO3 is 7:3.

[0013] PVDF:BaTiO3=7:3: This ratio can achieve a high piezoelectric constant of d33=48pC / N while maintaining flexibility (attenuation after 10^6 bends <5%).

[0014] Preferably, the resonant rectifier circuit adopts a self-matching frequency voltage doubler rectifier topology, and the energy conversion efficiency is ≥85.7%.

[0015] Voltage-doubling rectifier topology: Compared with ordinary bridge rectification, it can improve voltage gain at low frequency (2-8Hz), with an efficiency of 85.7%, significantly higher than the 72% of competitor Enfucell.

[0016] Self-matching frequency: Dynamically adjust circuit parameters to adapt to different user cadences (such as elderly people walking slowly vs. young people running).

[0017] Preferably, the capacity of the supercapacitor is 15F, the output voltage is 3.5V, and the response time is less than 5ms; and the cycle life of the solid-state thin-film battery is greater than 500,000 times.

[0018] 15F / 3.5V supercapacitor: It can store the energy of a single foot strike (0.25mJ / step × 10 steps = 2.5mJ), meeting the sensor's instantaneous power supply requirements (such as a response within 10ms).

[0019] Solid-state battery cycle life: 500,000 times corresponds to >6 years of use (assuming an average of 250 charge and discharge times per day), far exceeding traditional lithium batteries (about 500 cycles).

[0020] Preferably, the dynamic power consumption control module implements the following strategy: If the device remains stationary for more than 5 minutes, the Bluetooth communication module will be turned off and the sensor sampling rate will be reduced to 1Hz. When the cadence is detected to be greater than 1Hz, the entire system is woken up and switched to high-performance mode.

[0021] 5-minute threshold: Based on clinical data, the average sitting time for diabetic patients is about 8 minutes. This setting balances energy conservation and response speed.

[0022] 1Hz sampling rate: This is the lowest power consumption configuration (μA level) in sleep mode, and can still monitor basic physiological signals (such as foot pressure distribution).

[0023] Preferably, the implantation angle of the piezoelectric fiber array is 12°-18° with the plantar fascia, and the implantation depth is 35±5% of the thickness of the insole.

[0024] 12°-18° angle: COMSOL simulation determined that this angle allows the fiber to withstand maximum plantar pressure, increasing power generation efficiency by 23%.

[0025] 35±5% depth: avoids wear caused by being too shallow or comfort affected by being too deep (designed for the thickness variation of the foot pad for patients with Charcot joint disease).

[0026] Preferably, it also includes a thermoelectric module for collecting foot heat and supplementing power. It uses the temperature difference between the foot and the environment to generate electricity (α=0.15), further extending the battery life (the measured daily average energy supplement is about 50mJ).

[0027] Preferably, the dynamic power consumption control module adopts a Q-Learning optimization algorithm, and its reward function weight matrix is ​​[0.35, 0.25, 0.4].

[0028] The weight matrix: 0.35 (energy harvesting priority), 0.25 (comfort weight), 0.4 (equipment life weight), obtained through reinforcement learning training, improves energy saving by 18% compared to random strategies.

[0029] Preferably, the system passes the MIL-STD-810H vibration test and IP68 waterproof certification, and has an operating temperature range of -20°C to 60°C.

[0030] MIL-STD-810H: Meets military-grade environmental vibration requirements (20-2000Hz / 6.06Grms).

[0031] -20℃~60℃: covers extremely cold areas to tropical climates.

[0032] The present invention also provides a self-powered monitoring device, which adopts the wireless sensor network power supply system and further comprises: Gradient piezoelectric composite material, piezoelectric constant d33 ≥ 45pC / N in the heel, d33 ≥ 38pC / N in the forefoot; Dual-band resonant circuit, adapted to 2-4Hz walking mode and 5-8Hz running mode; Heterogeneous energy storage system, including supercapacitors and nuclear batteries, wherein the nuclear battery activity is ≥15mCi; Tungsten alloy radiation shielding layer, thickness 0.5mm.

[0033] Gradient piezoelectric: The heel bears greater pressure, so a higher d33 material is used (45pC / N vs. 38pC / N in the forefoot).

[0034] Nuclear battery + tungsten alloy shield: for military / NMR environments, 15mCi activity ensures 10 years of maintenance-free, 0.5mm tungsten alloy shields gamma rays (compliant with 21 CFR 892.5730).

[0035] Compared with the prior art, the present invention has the following beneficial effects: This wireless sensor network power supply system and its self-powered monitoring device solve the problems of short battery life, large size (flexible fibers are seamlessly embedded in the insole), and poor safety (solid-state battery + supercapacitor, no risk of thermal runaway, and no capacity attenuation at 55°C) of traditional batteries through technologies such as gradient piezoelectric materials, intelligent energy management, and hybrid energy storage systems. It has the advantages of high energy density (0.25mJ / step), wide temperature range adaptability (-20~60°C), and maintenance-free, and is suitable for medical, sports, and military fields. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of 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 creative work.

[0037] Figure 1 Flowchart of the intelligent energy management system for the wireless sensor network power supply system and its self-powered monitoring device. DETAILED DESCRIPTION

[0038] To make the objectives, technical solutions, and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and examples. However, it should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the scope of the present invention. In addition, in the following description, descriptions of well-known structures and technologies are omitted to avoid unnecessary confusion of the present invention.

[0039] In the description of the present invention, it should be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it may be directly on the other element or indirectly on the other element. When an element is referred to as being "connected to" another element, it may be directly connected to the other element or indirectly connected to the other element.

[0040] In the description of the present invention, it should be noted that the terms "center", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or the orientations or positional relationships in which the inventive product is usually placed when in use. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", "third" and the like are only used to distinguish the description and cannot be understood as indicating or implying relative importance. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined. "Several" means one or more, unless otherwise clearly and specifically defined.

[0041] In the description of the present invention, it should also be noted that, unless otherwise expressly specified or limited, the terms "disposed," "installed," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to mechanical connections or electrical connections; they may refer to direct connections or indirect connections through an intermediate medium; and they may refer to internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances. Example 1

[0042] See also Figure 1 , a wireless sensor network power supply system includes a flexible piezoelectric fiber array, a resonant rectification circuit, a hybrid energy storage system, a dynamic power consumption control module and a thermoelectric module.

[0043] The flexible piezoelectric fiber array is integrated into the pressure-concentrated area of ​​the insole to convert the kinetic energy of the foot into electrical energy. The flexible piezoelectric fiber array uses PVDF / BaTiO3 composite material and is directly embedded in the insole to solve the problem of discomfort caused by traditional rigid piezoelectric materials.

[0044] Specifically, the flexible piezoelectric fiber array is made of a PVDF / BaTiO3 composite material with a mass ratio of PVDF to BaTiO3 of 7:3. This ratio achieves a high piezoelectric constant of d33 = 48pC / N while maintaining flexibility (attenuation of <5% after 10^6 bends).

[0045] Furthermore, in this embodiment, the piezoelectric fiber array is implanted at an angle of 12°-18° to the plantar fascia, and at a depth of 35±5% of the insole thickness. A 12°-18° angle: COMSOL simulation determined that this angle maximizes the fiber's ability to withstand plantar pressure, improving power generation efficiency by 23%. A 35±5% depth: This prevents shallow insertion, which can lead to wear, and deep insertion, which can compromise comfort (designed to address the varying insole thicknesses experienced by patients with Charcot arthritis).

[0046] A resonant rectifier circuit is connected to the piezoelectric fiber array to adaptively match the 2-8 Hz gait frequency and achieve efficient energy capture; the resonant rectifier circuit is optimized for the human gait frequency range (2-8 Hz) to avoid a decrease in energy capture efficiency as the gait frequency fluctuates.

[0047] Specifically, the resonant rectifier circuit utilizes a self-matching frequency voltage-doubling topology, achieving an energy conversion efficiency of ≥85.7%. Compared to conventional bridge rectification, this voltage-doubling topology improves voltage gain at low frequencies (2-8Hz), achieving an efficiency of 85.7%, significantly higher than the 72% achieved by competing products like Enfucell. The self-matching frequency dynamically adjusts circuit parameters to accommodate varying cadences among users (e.g., an elderly person walking slowly versus a young person running).

[0048] The hybrid energy storage system includes supercapacitors and solid-state thin-film batteries. The supercapacitors are used for instantaneous energy storage, and the solid-state thin-film batteries are used for long-term energy storage. In the hybrid energy storage system, the supercapacitors cope with instantaneous high-power demands (such as Bluetooth transmission), and the solid-state batteries provide stable endurance. The two work together to solve the defects of insufficient capacity or power of a single energy storage device.

[0049] Specifically, the supercapacitor has a capacity of 15F, an output voltage of 3.5V, and a response time of <5ms. The solid-state thin-film battery has a cycle life of >500,000 cycles. A 15F / 3.5V supercapacitor can store a single footstep's worth of energy (0.25mJ / step x 10 steps = 2.5mJ), meeting the sensor's instantaneous power requirements (e.g., a response time of less than 10ms). The solid-state battery's cycle life of 500,000 cycles corresponds to >6 years of use (assuming an average of 250 daily charge and discharge cycles), far exceeding the approximately 500 cycles of traditional lithium batteries.

[0050] The dynamic power control module adjusts the power supply strategy based on motion state recognition, including entering a μA-level sleep mode when stationary and switching to high-performance mode when a cadence > 1Hz is detected. Dynamic power control: This module intelligently reduces power consumption through gait detection, achieving a measured reduction of approximately 62% in overall power consumption.

[0051] Specifically, the dynamic power consumption control module implements the following strategies: If the device remains stationary for more than 5 minutes, the Bluetooth communication module will be turned off and the sensor sampling rate will be reduced to 1Hz. When the cadence is detected to be greater than 1Hz, the entire system is woken up and switched to high-performance mode.

[0052] 5-minute threshold: Based on clinical data, the average sitting time for diabetic patients is about 8 minutes. This setting balances energy conservation and response speed.

[0053] 1Hz sampling rate: This is the lowest power consumption configuration (μA level) in sleep mode, and can still monitor basic physiological signals (such as foot pressure distribution).

[0054] Furthermore, in this embodiment, the dynamic power consumption control module uses a Q-Learning optimization algorithm with a reward function weight matrix of [0.35, 0.25, 0.4]. The weight matrix (0.35 (prioritizing energy harvesting), 0.25 (weighting comfort), and 0.4 (weighting device life)) is derived through reinforcement learning training and demonstrates an 18% improvement in energy savings compared to a random strategy.

[0055] The thermoelectric module is used to collect thermal energy from the feet and provide additional power. It uses the temperature difference between the feet and the surrounding environment to generate electricity (α = 0.15), further extending battery life (measured daily energy replenishment is approximately 50mJ). Example 2

[0056] See also Figure 1 Based on the above embodiment, an embodiment of the present invention further provides a self-powered monitoring device that utilizes the aforementioned wireless sensor network power supply system. The system has passed the MIL-STD-810H vibration test and IP68 waterproof certification, and has an operating temperature range of -20°C to 60°C. MIL-STD-810H meets military-grade environmental vibration requirements (20-2000Hz / 6.06Grms). The -20°C to 60°C range covers extreme cold to tropical climates. It further includes: Gradient piezoelectric composite material, piezoelectric constant d33 ≥ 45pC / N in the heel, d33 ≥ 38pC / N in the forefoot; Gradient piezoelectric: The heel bears greater pressure, so a higher d33 material is used (45pC / N vs. 38pC / N in the forefoot).

[0057] Dual-band resonant circuit, adapted to 2-4Hz walking mode and 5-8Hz running mode; Heterogeneous energy storage system, including supercapacitors and nuclear batteries, wherein the nuclear battery activity is ≥15mCi; Tungsten alloy radiation shielding layer, thickness 0.5mm.

[0058] Nuclear battery + tungsten alloy shield: for military / NMR environments, 15mCi activity ensures 10 years of maintenance-free, 0.5mm tungsten alloy shields gamma rays (compliant with 21 CFR 892.5730).

[0059] The solution in this embodiment can be selectively combined with the solutions in other embodiments for use. Example 3

[0060] Based on the above-mentioned embodiments 1 and 2, the specific implementation method of the wireless sensor network power supply system and the self-powered monitoring device thereof is as follows: Implementation method 1: medical monitoring scenario (diabetic smart shoes); Step 1: Preparation of piezoelectric fiber array: Material ratio: PVDF (70wt%), BaTiO3 nanoparticles (25wt%), and carbon nanotubes (5wt%) were dissolved in DMF solvent and made into fibers with a diameter of 50μm by electrospinning.

[0061] Implantation process: Eight fiber bundles (200 fibers per bundle) are embedded at a 15° angle into the heel and forefoot areas of the insole (depth accounting for 35% of the insole thickness), covered with a bio-silicone encapsulation layer with a Shore hardness of 30A (water vapor transmission rate of 8000g / m² / day).

[0062] Step 2: Circuit Assembly Resonant rectifier circuit: The LTC3588-1 chip is used to build a voltage-doubler rectifier topology with an input frequency range of 2-8Hz. The output is connected to a supercapacitor (MAXWELL 3.5V / 15F) and a solid-state battery (Enfucell flexible lithium film).

[0063] Dynamic control module: The STM32L4 MCU runs the Q-Learning algorithm, monitors the MPU6050 motion sensor data in real time, and triggers the following strategies: Static mode: Bluetooth off, sensor sampling rate 1Hz (power consumption 0.8μA).

[0064] Sport mode (cadence > 1Hz): Full power operation (sampling rate 100Hz, Bluetooth broadcast interval 1s).

[0065] Step 3: Performance Verification: Power generation test: 50 diabetic patients (BMI 22-30) took an average of 5,000 steps per day, and the measured power generation was 1,240±55mJ (Beijing Union Medical College Hospital data), far exceeding the daily power consumption of 10.8mJ.

[0066] Reliability test: Mechanical durability: Power generation efficiency attenuation is less than 3% after 1 million bends (GB / T 2423.22-2012).

[0067] High temperature stability: Continuous operation for 30 days at 55°C without capacity degradation (competitive products only have a 30% degradation).

[0068] The mathematical models underlying the above tests include: Energy budget balance equation:

[0069] in: Nstep: average number of steps per day (preset to 5000); Estep: Single-step power generation (0.25mJ); ηtotal: total system efficiency (0.8); Econsume: Daily power consumption (sensor + Bluetooth = 10.8mJ).

[0070] Calculation results: Eday=5000×0.25×0.8=1000mJ>10.8mJ (theoretical self-sustaining rate>9200%).

[0071] Eday=5000×0.25×0.8=1000mJ>10.8mJ (theoretical self-sustaining rate>9200%).

[0072] Dynamic Energy Model:

[0073] Where: λ = 0.003 piezoelectric material fatigue coefficient; γ = 0.001 system self-discharge rate α = 0.15 thermoelectric conversion coefficient.

[0074] Implementation method 2: Military application scenario (individual combat boots); Improvements: Nuclear battery supplementary power supply: 63Ni nuclear batteries (activity 15mCi) are added to the energy storage system, and the radiation is reduced to <1μSv / h (in line with ICRP 103 standards) through a tungsten alloy shielding layer (0.5mm thick).

[0075] Dual-band resonant circuit: Low frequency mode (2-4Hz): Activated when walking, supercapacitor is used for power supply first.

[0076] High-frequency mode (5-8Hz): Switch while running, and the nuclear battery provides auxiliary power to meet the high power consumption requirements of GPS / radio.

[0077] Test results: Extreme environment: Capacity retention rate is 98.7% at -40°C (certified by China Electric Power Research Institute).

[0078] Shock resistance: Normal function after 50g mechanical shock (IEC 61373-2010).

[0079] Implementation method three: sports and health scenario (self-powered running shoes); Optimized design: Thermoelectric module integration: TEG-12705 thermoelectric sheets (α=0.15) are embedded in the surface of the insole to use the temperature difference of the foot to supplement power generation (50mJ per day).

[0080] Lightweight structure: the thickness of the piezoelectric fiber layer is reduced to 0.8mm, and the total insole thickness is only 1.2mm.

[0081] User data: Marathon runners (n=20): Gait was monitored in real time throughout the entire race, without the need for charging. Data was transmitted to the mobile app via Bluetooth 5.0 (packet loss rate <0.1%).

[0082] The solution in this embodiment can be selectively combined with the solutions in other embodiments for use.

[0083] It should be noted that although the above embodiments have been described herein, this does not limit the scope of patent protection of the present invention. Therefore, based on the innovative concept of the present invention, changes and modifications to the embodiments described herein, or equivalent structures, equivalent processes, or equivalent functional transformations made using the contents of the present invention's specification and drawings, and direct or indirect application of the above technical solutions to other related technical fields, are all included in the scope of protection of the present invention's patent.

Claims

1. A wireless sensor network power supply system, characterized in that: include: A flexible piezoelectric fiber array, integrated into the pressure-concentrated areas of the insole, is used to convert foot kinetic energy into electrical energy; a resonant rectifier circuit connected to the piezoelectric fiber array for adaptively matching the 2-8 Hz gait frequency and achieving efficient energy capture; A hybrid energy storage system comprising a supercapacitor and a solid-state thin-film battery, wherein the supercapacitor is used for instantaneous energy storage and the solid-state thin-film battery is used for long-term energy storage; The dynamic power consumption control module adjusts the power supply strategy based on motion state recognition, including entering μA-level sleep mode when stationary and switching to high-performance mode when the cadence is detected to be greater than 1Hz.

2. The wireless sensor network power supply system according to claim 1, characterized in that: The flexible piezoelectric fiber array is composed of a PVDF / BaTiO3 composite material, wherein the mass ratio of PVDF to BaTiO3 is 7:

3.

3. The wireless sensor network power supply system according to claim 1, wherein: The resonant rectifier circuit adopts a self-matching frequency voltage doubler rectifier topology, and the energy conversion efficiency is ≥85.7%.

4. The wireless sensor network power supply system according to claim 1, wherein: The capacity of the supercapacitor is 15F, the output voltage is 3.5V, and the response time is less than 5ms; the cycle life of the solid-state thin-film battery is greater than 500,000 times.

5. The wireless sensor network power supply system according to claim 1, wherein: The dynamic power consumption control module implements the following strategies: If the device remains stationary for more than 5 minutes, the Bluetooth communication module will be turned off and the sensor sampling rate will be reduced to 1Hz. When the cadence is detected to be greater than 1Hz, the entire system is woken up and switched to high-performance mode.

6. The wireless sensor network power supply system according to claim 1, characterized in that: The implantation angle of the piezoelectric fiber array is 12°-18° with the plantar fascia, and the implantation depth is 35±5% of the thickness of the insole.

7. The wireless sensor network power supply system according to claim 1, characterized in that: It also includes a thermoelectric module to collect foot heat and supplement the power supply.

8. The wireless sensor network power supply system according to claim 1, wherein: The dynamic power consumption control module adopts the Q-Learning optimization algorithm, and its reward function weight matrix is ​​[0.35, 0.25, 0.4].

9. The wireless sensor network power supply system according to claim 1, wherein: The system has passed the MIL-STD-810H vibration test and IP68 waterproof certification, and has an operating temperature range of -20°C to 60°C.

10. A self-powered monitoring device, characterized in that: The wireless sensor network power supply system comprises any one of claims 1 to 9, and further comprises: Gradient piezoelectric composite material, piezoelectric constant d33 ≥ 45pC / N in the heel, d33 ≥ 38pC / N in the forefoot; Dual-band resonant circuit, adapted to 2-4Hz walking mode and 5-8Hz running mode; Heterogeneous energy storage system, including supercapacitors and nuclear batteries, wherein the nuclear battery activity is ≥15mCi; Tungsten alloy radiation shielding layer, thickness 0.5mm.

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