Piezoelectric sheet and vibration energy collector

Abstract

The invention discloses a piezoelectric plate and a vibration energy collector. The vibration energy collector comprises the piezoelectric plate, a base and a mass block, wherein the base is used for fixing the piezoelectric plate, and the mass block is arranged at the free end of the piezoelectric plate. The piezoelectric plate comprises a piezoelectric plate body, an upper surface electrode, a lower surface electrode and two side surface electrodes, wherein the upper surface of the piezoelectric plate is coated by the upper surface electrode, the lower surface of the piezoelectric plate is coated by the lower surface electrode, the two side surfaces of the piezoelectric plate are coated by the two side surface electrodes respectively, the two side surface electrodes are perpendicular to the upper surface electrode and the lower surface electrode and are not communicated with the upper surface electrode and the lower surface electrode, and a conductive wire is led out of each electrode of the piezoelectric plate to serve as an output port. According to the collector, low-frequency vibration in the environment where the collector is located drives the base to vibrate to enable the piezoelectric plate to produce bending deformation. Meanwhile, deformation between the vertical electrodes is produced by means of the Poisson effect, restraining of a strain neutral surface is avoided, effective potential is produced among different electrodes of the piezoelectric plate, and therefore the piezoelectric plate outputs energy more effectively, and energy output efficiency is improved. Meanwhile, the collector can provide a plurality of output modes.

Description

technical field [0001] The invention belongs to the technical field of vibration energy conversion and collection, in particular to a piezoelectric sheet and a vibration energy collector. Background technique [0002] The use of wireless sensors and portable electronic devices has grown steadily in recent years, and a large proportion of these devices rely on traditional chemical batteries to provide energy. However, with the progress of microelectronics integration process, the traditional chemical battery is gradually becoming a bottleneck restricting the development of microelectronics devices. First, conventional chemical batteries account for an increasing proportion of the overall device volume, hindering device miniaturization. Second, its limited power limits the lifetime of the entire device. Again, with the extensive use of microelectronics, battery replacement will not be feasible. Therefore, harvesting energy from the surrounding environment to replace chemica...

AI Technical Summary

Problems solved by technology

The single-layer piezoelectric cantilever structure is restricted by the strained neutral plane of the piezoelectric material, resulting in the same charge generated by the electrodes on the upper and lower surfaces, which cannot generate an effective potential difference. Electric effect is not very effective

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