A lithium-ion battery ultrasonic pulse monitoring device

Abstract

The invention discloses a lithium ion battery ultrasonic pulse monitoring device and belongs to the field of lithium battery state monitoring. The device of the invention comprises an ultrasonic transducer sheet, a first resistor, a second resistor, a first Schottky diode, a second Schottky diode, a third Schottky diode, a diode, a diode group, an inductor, an NMOS transistor and a PMOS transistor. A square wave signal is input into the gate of the NMOS transistor. A negative high voltage is input into the source of the NMOS transistor. The drain of the NMOS transistor outputs negative high voltage to drive the ultrasonic transducer sheet to generate a parameter-adjustable ultrasonic wave. A complementary square wave signal is input into the gate of the PMOS transistor. The output of the drain of the PMOS transistor is shaped by the diode group to be output to the drain of the NMOS transistor to turn off the NMOS transistor to improve the shaping of the ultrasonic signal waveform. Theultrasonic signal generated by the device can be optimally matched with the lithium ion battery pack. The most information and the optimal signal-to-noise ratio can be obtained when performing internal abnormal state monitoring of lithium ion battery with the ultrasonic waves.

Description

technical field [0001] The invention belongs to the technical field of lithium battery monitoring, and more particularly relates to a lithium ion battery ultrasonic pulse monitoring device. Background technique [0002] With the rapid development of lithium battery technology, more and more applications of lithium batteries are appearing around people, such as electric vehicles, mobile phones, watches and other equipment need lithium batteries to supply energy, basically everyone will have lithium batteries around, but at present There are still potential safety hazards in the use of lithium batteries. Improper use of lithium batteries may cause dangerous accidents such as overheating, burning, explosion, etc., which seriously threaten personal safety. [0003] At present, the state monitoring of lithium batteries is basically by monitoring the electrical characteristics and temperature characteristics exhibited outside the lithium battery. Its external electrical character...

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Problems solved by technology

[0004] (1) At present, no ultrasonic parameters with the best matching degree with lithium-ion batteries have been found. When performing ultrasonic waves on lithium-ion batteries, different ultrasonic parameters, such as waveforms, frequencies, and pulse widths, will be reflected in the ultrasonic signals received by the receiving end. The capacity of lithium battery status is different. If you do not select the appropriate ultrasonic parameters for lithium battery ultrasound, you can analyze and obtain very little lithium battery information.

[0005] (2) At present, the ultrasonic waves generated by the existing ultrasonic transducers are mainly multi-frequency point superimposed ultrasonic waves and non-highly shaped ultrasonic waves; multi-frequency point superimposed ultrasonic waves are superimposed with multiple high-order harmonics. In a variety of use environments, the use of Multiple high-order harmonics are conducive to comparative experimental verification through ultrasonic waves of different frequencies; in ultrasonic monitoring of lithium-ion batteries, ultrasonic waves with high-order superimposed harmonics will introduce a lot of noise, which will affect the observation and extraction of useful signals; For high-resolution ultrasound, the replacement of the transducer sheet also requires the replacement of various parameters of the ultrasound. Considering the cost and difficulty of circuit design, the ultrasonic generators on the market are also designed to adapt to a variety of use environments. A large dead zone margin is required, and the use in lithium-ion battery ultrasonic monitoring will cause a short-term change in the signal amplitude and superimpose into the output signal, resulting in a nonlinear relationship between the output signal and the input signal amplitude, which is not suitable for lithium-ion battery monitoring. ultrasonic monitoring,

[0006] Due to the above reasons, the current research on ultrasonic monitoring of lithium batteries is at a standstill

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