Vibration and temperature difference compound piezoelectric energy harvesting battery

Abstract

The invention relates to a vibration and temperature difference compound piezoelectric energy harvesting battery, and the battery comprises: an upper battery shell, a lower battery shell, an upper spring, a lower spring, an upper piezoelectric cantilever beam, a lower piezoelectric cantilever beam, a transmission shaft, a dish-shaped thermal bimetal sheet and a cooling tower; wherein the upper battery shell senses energy in external environment and transmits to the dish-shaped thermal bimetal sheet to enable the sheet to transform downwards at a critical temperature point, the transmission shaft is driven to move downwards, the upper piezoelectric cantilever beam is released, vibration is generated, the lower piezoelectric cantilever beam is shocked, and vibration is generated under the action of the lower spring. When the dish-shaped thermal bimetal sheet is cooled by the cooling tower, the transformation is recovered, the transmission shaft moves upwards, and the upper and the lower piezoelectric cantilever beams vibrate again. According to the invention, the device generates electricity by utilizing environmental vibration, when the device is used for MEMS equipment, power supply requirement of the MEMS equipment can be satisfied, and the device has advantages of simple structure, strong environment adaptability, high energy harvesting efficiency, easy integration and the like.

Description

technical field [0001] The invention belongs to the field of piezoelectric power generation, and in particular relates to a vibration and temperature difference composite piezoelectric energy harvesting battery. Background technique [0002] In recent years, with the application of micro-electro-mechanical devices (MEMS) in wireless sensor network nodes, military weapons, aerospace, medical and other fields, the power supply of micro-electro-mechanical devices has attracted widespread attention. Traditional chemical batteries have problems such as limited battery life, difficulty in integration, poor environmental adaptability, and pollution. Traditional line power supply cannot be applied to micro-electromechanical devices in specific occasions. Therefore, more and more attention has been paid to self-powered equipment. Equipment such as solar power generation, electromagnetic power generation, temperature difference power generation, vibration power generation, and wind po...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the problem that the current piezoelectric energy harvesting device using vibration can only use a single environmental vibration to generate electricity, a vibration and temperature difference composite piezoelectric energy harvesting battery is proposed.

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