CN115183708A - Deformation detection method, deformation detection system and battery - Google Patents
Deformation detection method, deformation detection system and battery Download PDFInfo
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- CN115183708A CN115183708A CN202110366933.2A CN202110366933A CN115183708A CN 115183708 A CN115183708 A CN 115183708A CN 202110366933 A CN202110366933 A CN 202110366933A CN 115183708 A CN115183708 A CN 115183708A
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- deformation
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B17/00—Measuring arrangements characterised by the use of infrasonic, sonic or ultrasonic vibrations
- G01B17/04—Measuring arrangements characterised by the use of infrasonic, sonic or ultrasonic vibrations for measuring the deformation in a solid, e.g. by vibrating string
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Abstract
The invention relates to a deformation detection method for detecting the surface deformation of an object, which comprises the following steps: generating a control signal (S01), and generating a target frequency signal (S02) according to the control signal; transmitting the target frequency signal to the deformation sensor (1) (S03); converting the target frequency signal into a vibration signal by the deformation sensor (1) and exciting a surface acoustic wave (S04); the surface acoustic wave is converted into a sensor signal by the deformation sensor (1) (S05). According to the invention, the sensor signals are processed to obtain the deformation of the surface of the object. The invention also relates to a deformation detection system and a battery.
Description
Technical Field
The invention relates to a deformation detection method, a deformation detection system and a battery for detecting the deformation of the surface of an object.
Background
Interdigital transducer devices are known in the art for exciting and receiving surface acoustic waves. For example, CN111879853A discloses a shear-wave mode surface acoustic wave resonant detector, which includes a substrate and a three-transducer two-terminal-to-resonator structure disposed thereon; the substrate is made of a piezoelectric material capable of exciting a shear wave mode surface acoustic wave; the three-transducer double-end-to-resonator structure comprises a second interdigital transducer, a first interdigital transducer and a third interdigital transducer which are arranged in parallel on two sides of the second interdigital transducer, a first periodic grating array arranged in parallel on the other side of the first interdigital transducer, and a second periodic grating array arranged in parallel on the other side of the third interdigital transducer.
CN111751444a discloses a surface acoustic wave sensor and device, the surface acoustic wave sensor includes: the input interdigital transducer and the output interdigital transducer are arranged on the first surface of the piezoelectric crystal in parallel; the SiO2 passivation thin layer is arranged on the second surface of the piezoelectric crystal, the third surface of the input interdigital transducer and the third surface of the output interdigital transducer; two sound absorption glues are arranged on the fourth surface of the SiO2 passivation thin layer, one sound absorption glue of the two sound absorption glues is arranged at one end, away from the output interdigital transducer, of the input interdigital transducer, and the other sound absorption glue of the two sound absorption glues is arranged at one end, away from the input interdigital transducer, of the output interdigital transducer; the gas-sensitive film is arranged on SiO 2 And the passivation thin layer is arranged on the fourth surface and is positioned between the two sound absorption glues.
In the existing deformation detection method, the detection of the traces is generally realized by detecting the frequency or wavelength of the surface acoustic wave, but the detection method not only has high energy consumption but also has low precision.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: provided is a deformation sensor for detecting surface deformation of an object, which is low in cost, simple in installation, low in energy consumption, and high in detection accuracy.
According to the present invention, a deformation detecting method for detecting deformation of a surface of an object includes the steps of:
a control signal is generated in response to the control signal,
generating a target frequency signal according to the control signal,
the target frequency signal is sent to the deformation sensor,
the deformation sensor converts the target frequency signal into a vibration signal and excites the surface acoustic wave,
the surface acoustic wave is converted into a sensor signal by the deformation sensor,
and processing the sensor signal to obtain the deformation of the surface of the object.
Through the arrangement of the reflecting device, a plurality of single-end-pair resonators do not need to be arranged as in the prior art, so that on one hand, materials are saved, the materials and the installation cost are reduced, on the other hand, the energy consumption is low when the device is used, and meanwhile, the detection precision is improved.
According to a preferred embodiment, the method comprises: and performing phase detection processing on the target frequency signal and the sensor signal.
According to a preferred embodiment, after the phase detection processing of the target frequency signal and the sensor signal, the phase difference between the target frequency signal and the sensor signal is determined and the deformation of the object surface is determined from the phase difference.
According to a preferred embodiment, the phase difference between the target frequency signal and the sensor signal is obtained by analog-to-digital conversion or pulse width measurement of the detected target frequency signal and the sensor signal.
According to a preferred embodiment, the sensor signal is amplified and filtered before the phase detection processing is performed on the target frequency signal and the sensor signal.
According to a preferred embodiment, the target frequency signal is a fixed frequency signal or a frequency sweep signal.
According to a preferred embodiment, the method comprises: and measuring the frequency of the surface acoustic wave, determining a reference deformation quantity according to the frequency of the surface acoustic wave, and detecting the reliability of the obtained deformation of the surface of the object by using the reference deformation quantity.
The invention also provides a deformation detection system, comprising: the device comprises a deformation sensor, an amplification and filtering module, a power supply module, an oscillator, a phase detector and a controller. The deformation detection system is configured for carrying out the method according to the invention.
According to a preferred embodiment, the deformation sensor comprises: an input transducer connected to a power source and configured to excite a surface acoustic wave on a surface of an object; a reflecting device that reflects the surface acoustic wave excited by the input transducer; and the output transducer receives the surface acoustic wave reflected by the reflecting device, wherein the output transducer can convert the received surface acoustic wave into a sensor signal, and the surface deformation of the surface of the object is obtained from the sensor signal.
According to a preferred embodiment, the input and output transducers are opposed across from each other, thereby forming a typical set of single-ended-pair resonators; the reflecting device comprises reflecting gratings which are arranged on one side or two sides of the input transducer and the output transducer, and the reflecting gratings comprise a plurality of strip-shaped metal film electrodes which are arranged side by side at certain intervals; the object surface is a surface of a battery cell housing, or a surface of a battery module housing.
The invention further proposes a battery having a deformation detection system according to the invention for detecting deformation of the battery.
Drawings
Fig. 1 shows a prior art interdigital transducer.
Fig. 2 shows an embodiment of the deformation sensor according to the invention.
FIG. 3 shows a block diagram of a deformation detection system according to the present invention.
FIG. 4 shows a flow diagram of one embodiment of a deformation detection method in accordance with the present invention.
Fig. 5 shows an exemplary arrangement of the deformation sensor according to the invention on the battery housing.
Detailed Description
Fig. 1 shows a conventional interdigital transducer, which is composed of a plurality of metal film electrodes disposed on a piezoelectric substrate material S. These electrodes are placed across each other, and both ends are connected together by a bus bar D. It is shaped like two rows of fingers lying crosswise and is called an interdigital electrode. Thereby forming a plurality of sets of single-ended resonators. If the electrode width a and the electrode spacing b are equal, a uniform interdigital transducer is referred to. The period of the electrodes here depends on the electrode width a and the electrode spacing b.
Two adjacent electrodes form an electrode pair, the length of which overlaps each other is the effective finger length, i.e. the aperture of the transducer. If both ends of the bus bar are connected to an alternating power source U (t), a surface acoustic wave, particularly a rayleigh wave, is generated below the electrodes, the surface acoustic wave radiating to both ends. By utilizing the piezoelectric effect and the inverse piezoelectric effect of the piezoelectric material, the transducer can excite surface acoustic waves and also can receive the surface acoustic waves. The frequency of the acoustic surface wave is equal to the frequency of the applied electrical signal. The surface acoustic wave is propagated to an output transducer, and can be converted into an electric signal by inverse piezoelectric effect to be output.
The existing interdigital transducer can measure the deformation of the surface, but has the problems of large energy consumption, insufficient measurement precision, large data processing capacity and the like.
Fig. 2 shows an embodiment of the deformation sensor according to the invention. The deformation sensor is used to detect deformation of the surface of the object and is thus disposed on the surface of the object. According to this embodiment, the deformation sensor comprises an input transducer 11, an output transducer 12 and a reflecting means 13. The input transducer 11 includes a piezoelectric substrate material and a finger-like metal film electrode disposed on the piezoelectric substrate material. The output transducer 12 is arranged opposite the input transducer 11 and likewise comprises a piezoelectric substrate material and a finger-like metal membrane electrode arranged thereon. As shown in fig. 2, the output transducer 12 and the input transducer 11 are arranged in a crossed configuration to form a typical single-ended pair resonator.
On both sides of the opposing structure of the output transducer 12 and the input transducer 11, reflection means 13 for reflecting surface acoustic waves are arranged. Of course, it is also conceivable to arrange such reflecting means 13 only on one side of the opposing arrangement of the output transducer 12 and the input transducer 11. As shown, in the present embodiment, the reflecting means 13 is configured as a reflecting grating comprising a plurality of reflecting elements. The reflecting grating comprises a plurality of strip-shaped metal film electrodes or other similar structures which are arranged side by side at certain intervals.
By the arrangement of the reflection device, a plurality of single-end-pair resonators do not need to be arranged as in the prior art, so that the material and the energy consumption can be saved, and the detection precision can be improved at the same time. This is particularly advantageous when it is provided for large-area deformation detection.
FIG. 3 shows a block diagram of a deformation detection system according to the present invention. As shown in fig. 3, the deformation detection system includes a deformation sensor 1, an amplification and filtering module 2, a power supply module 3, an oscillator 4 (particularly, a resonance type oscillator), a phase detector 5, and a controller 6. The power module 3 is used for supplying power to the oscillator 4, the controller 6, the phase detector 5 and the amplifying and filtering module 2.
The deformation detection method according to the present invention is performed using the deformation detection system according to the present invention. A flow diagram of one embodiment of the deformation detection method is shown in fig. 4.
First, the controller 6 sends a control signal to the oscillator 4 (S01). The oscillator 4 receives the control signal of the controller 6 and generates a target frequency signal, which may be a fixed frequency signal or a frequency sweep signal, according to the control signal (S02). Then, the target frequency signal is transmitted to the deformation sensor 1 (S03).
The deformation sensor 1 receives the target frequency signal and converts the target frequency signal into a vibration signal by the input transducer 11 (S04). The finger structure of the input transducer 11 thereby excites a surface acoustic wave on the surface of the object, which propagates outwardly along the surface of the piezoelectric substrate material. The surface acoustic waves are transferred to the respective reflective gratings of the reflecting means 13 via the piezoelectric substrate material. The reflective gratings sense the vibration of the surface structure, which undergoes reciprocal reflection, superposition, resonance between the reflective gratings, thereby forming a standing wave.
The vibration signal is in turn passed to the output transducer 12, and the output transducer 12 converts the vibration signal into a sensor signal (S05) and passes it to the amplification and filtering module 2.
Since the sensor signal output by the deformation sensor 1 is weak and susceptible to interference, the amplification and filtering module 2 amplifies and filters the sensor signal (S06), and the amplified and filtered sensor signal is transmitted to the phase detector 5 (S07).
The phase detector 5 also receives a target frequency signal from the oscillator 4 (S08). The phase detector 5 performs phase detection on the received target frequency signal and the amplified and filtered sensor signal (S09), generates a voltage signal or a pulse signal, and outputs the voltage signal or the pulse signal to the controller 6.
The controller 6 receives the voltage signal or the pulse signal output by the phase detector 5, and obtains the phase difference between the target frequency signal emitted by the oscillator 4 and the sensor signal through analog-to-digital conversion or pulse width measurement (S10). The phase difference reflects the delay time between the vibration signal and the vibration signal reflected by the reflective grating.
And then, calculating the deformation amount of the piezoelectric substrate material according to the delay time (S11), thereby obtaining the information such as the deformation amount, the pressure value and the like of the surface of the detected object.
Alternatively, the amount of distortion can be determined by measuring the surface acoustic wave frequency. For example, for a reflection grating with uniformly distributed interdigital spacing and reflection grating finger spacing, the surface acoustic wave frequency, i.e., the oscillation frequency of the oscillator 4, is as follows:
f surface acoustic wave frequency (frequency of applied electrical signal)
v, the acoustic surface wave sound velocity of the material is determined by the selection of the piezoelectric substrate material
λ: wavelength of surface acoustic wave
l p Electrode spacing (i.e. half wavelength)
Therefore, under the condition that the acoustic surface wave sound velocity v and the acoustic surface wave frequency f of the material are known, the electrode interval can be directly obtained, and the deformation of the surface can be obtained through the electrode interval.
In this case, the amount of deformation determined using the frequency of the surface acoustic wave may be used as a reference amount of deformation, and the amount of deformation obtained using the phase difference may be detected with certainty using the reference amount of deformation
Fig. 5 shows an exemplary arrangement of the deformation sensor according to the invention on the battery housing. As shown, the deformation sensor is arranged in the form of a patch on the housing surface 40 of the battery housing. Preferably, the deformation sensor is disposed on the case surface 40 of the battery case in a region where a large deformation is expected. Here, the deformation sensor may be disposed on a surface of the battery cell case, or on a surface of the case of the battery module.
By providing the deformation sensor as described above, the deformation of the lithium battery case can be directly detected. The deformation sensor is easy to install, small in size, light in weight and low in cost, and the size of the sensor can be adjusted at will according to the size of a battery.
Claims (11)
1. A deformation detecting method for detecting deformation of a surface of an object, the method comprising the steps of:
a control signal (S01) is generated,
generating a target frequency signal according to the control signal (S02),
transmitting the target frequency signal to the deformation sensor (1) (S03),
the deformation sensor (1) converts the target frequency signal into a vibration signal and excites a surface acoustic wave (S04),
the surface acoustic wave is converted into a sensor signal by the strain sensor (1) (S05),
it is characterized in that the preparation method is characterized in that,
and processing the sensor signal to obtain the deformation of the surface of the object.
2. A deformation sensing method according to claim 1, characterized in that the method comprises: the target frequency signal and the sensor signal are subjected to phase detection processing (S09).
3. The strain detection method according to claim 2, wherein after the phase detection processing is performed on the target frequency signal and the sensor signal, a phase difference between the target frequency signal and the sensor signal is obtained, and the strain of the surface of the object is obtained from the phase difference (S10, S11).
4. A deformation sensing method according to claim 3, characterized in that the phase difference between the target frequency signal and the sensor signal is obtained by performing analog-to-digital conversion or pulse width measurement on the detected target frequency signal and the sensor signal.
5. A deformation sensing method according to claim 2, characterized in that the sensor signals are amplified and filtered (S06) before the phase detection processing is performed on the target frequency signals and the sensor signals.
6. The deformation sensing method according to claim 1, wherein the target frequency signal is a fixed frequency signal or a frequency-sweep signal.
7. A deformation sensing method according to claim 2, characterized in that the method comprises: and measuring the frequency of the surface acoustic wave, determining a reference deformation quantity according to the frequency of the surface acoustic wave, and detecting the reliability of the obtained deformation of the surface of the object by using the reference deformation quantity.
8. A deformation detection system, comprising: -a deformation sensor (1), -an amplification and filtering module (2), -a power supply module (3), -an oscillator (4), -a phase detector (5) and-a controller (6), characterized in that said deformation detection system is configured for implementing the method of any of the preceding claims.
9. A deformation sensing system according to claim 8, characterized in that the deformation sensor comprises: an input transducer (11) connected to a power source and for exciting a surface acoustic wave on a surface of an object; reflecting means (13) for reflecting the surface acoustic wave excited by the input transducer; an output transducer (12) which receives the surface acoustic waves reflected by the reflection means (13), wherein the output transducer (12) is capable of converting the received surface acoustic waves into a sensor signal from which the surface deformations of the object surface are derived.
10. Deformation sensing system according to claim 9, characterized in that the input transducer (11) and the output transducer (12) are arranged crosswise opposite each other, thus constituting a typical set of single-ended-pair resonators; the reflecting device (13) comprises reflecting grids arranged on one side or two sides of the input transducer (11) and the output transducer (12), and the reflecting grids comprise a plurality of strip-shaped metal film electrodes which are arranged side by side at certain intervals; the object surface is a surface of a battery cell housing, or a surface of a battery module housing.
11. A battery having a deformation sensing system according to any one of claims 8 to 10 for sensing deformation of the battery.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110366933.2A CN115183708A (en) | 2021-04-06 | 2021-04-06 | Deformation detection method, deformation detection system and battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110366933.2A CN115183708A (en) | 2021-04-06 | 2021-04-06 | Deformation detection method, deformation detection system and battery |
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| Publication Number | Publication Date |
|---|---|
| CN115183708A true CN115183708A (en) | 2022-10-14 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110366933.2A Pending CN115183708A (en) | 2021-04-06 | 2021-04-06 | Deformation detection method, deformation detection system and battery |
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| CN (1) | CN115183708A (en) |
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- 2021-04-06 CN CN202110366933.2A patent/CN115183708A/en active Pending
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