CN214848679U - Deformation sensor, battery case and battery - Google Patents
Deformation sensor, battery case and battery Download PDFInfo
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- CN214848679U CN214848679U CN202120691299.5U CN202120691299U CN214848679U CN 214848679 U CN214848679 U CN 214848679U CN 202120691299 U CN202120691299 U CN 202120691299U CN 214848679 U CN214848679 U CN 214848679U
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Abstract
The utility model relates to a deformation sensor, battery case and battery. A deformation sensor for detecting deformation of a surface of an object includes: the device comprises an input transducer (1) connected with a power supply and used for exciting a surface acoustic wave on the surface of the object, a reflecting device (3) for reflecting the surface acoustic wave excited by the input transducer, and an output transducer (2) for receiving the surface acoustic wave reflected by the reflecting device (3), wherein the output transducer (2) can convert the received surface acoustic wave into an electric signal, and the surface deformation of the surface of the object is obtained through the electric signal.
Description
Technical Field
The invention relates to a deformation sensor for detecting the surface deformation of an object, a battery shell and a battery.
Background
Interdigital transducer devices are known in the art for exciting and receiving surface acoustic waves. For example, CN111879853A discloses a surface acoustic wave resonant detector of shear wave mode, which comprises 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 a 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; SiO 22The 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 SiO2One 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 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 SiO2And the passivation thin layer is arranged on the fourth surface and is positioned between the two sound absorption glues.
If the detector or the transducer is used for detecting the deformation of the surface of an object, especially when large-area detection is carried out, the problems of high energy consumption, low precision, inapplicability to large-area deformation measurement and the like exist.
SUMMERY OF THE UTILITY MODEL
The utility model discloses the technical problem that will solve is: 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 utility model discloses, a deformation sensor for detecting object surface deformation, its characterized in that, this deformation sensor includes:
an input transducer connected to a power source and configured to excite a surface acoustic wave on the surface of the object,
reflecting means for reflecting the surface acoustic wave excited by the input transducer,
an output transducer receiving the surface acoustic wave reflected by the reflecting means,
the output transducer can convert the received surface acoustic waves into electric signals, and the surface deformation of the surface of the object is obtained through the electric signals.
According to the invention, through the arrangement of the reflecting device, a plurality of single-end-pair resonators do not need to be arranged as the prior art, so that on one hand, the material is saved, the material 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 input transducer comprises a piezoelectric substrate material and a finger-like metal membrane electrode disposed on the piezoelectric substrate material.
According to a preferred embodiment, the output transducer comprises a piezoelectric substrate material and a finger-like metal membrane electrode disposed on the piezoelectric substrate material.
According to a preferred embodiment, the input and output transducers are arranged in opposed intersecting relation to one another to form a typical set of single-ended resonators.
According to a preferred embodiment, the reflecting means comprises a reflecting grating arranged on one or both sides of the input transducer and the output transducer.
According to a preferred embodiment, the reflective grating comprises a plurality of strip-shaped metal film electrodes arranged side by side at certain intervals.
According to a preferred embodiment, the object surface is a surface of a battery cell housing, or a surface of a battery module housing.
The utility model discloses still provide a battery case, arranged the basis with the paster form on this battery case's the surface the utility model discloses a deformation sensor.
The utility model discloses provide a battery in addition, this battery has the basis the utility model discloses a battery case.
Drawings
Fig. 1 shows a prior art interdigital transducer.
Fig. 2 shows an embodiment of a deformation sensor according to the invention.
Fig. 3 shows an exemplary arrangement of deformation sensors on a battery housing according to the invention.
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 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 means of the 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 10 according to the invention. The deformation sensor 10 is used to detect deformation of the surface of the object and is thus disposed on the surface of the object surface. According to this embodiment, the deformation sensor 10 comprises an input transducer 1, an output transducer 2 and a reflecting means 3. The input transducer 1 comprises a piezoelectric substrate material and a finger-like metal membrane electrode arranged on the piezoelectric substrate material. The output transducer 2 is arranged opposite the input transducer 1 and likewise comprises a piezoelectric substrate material and a finger-like metal membrane electrode arranged thereon. As shown in fig. 2, the output transducer 2 and the input transducer 1 are arranged in a crosswise opposed relationship to each other to constitute a typical set of single-ended pair resonators.
On both sides of the opposing structure of the output transducer 2 and the input transducer 1, reflection means 3 for reflecting surface acoustic waves are arranged. Of course, it is also conceivable to arrange such reflecting means 3 only on one side of the opposing structure of the output transducer 2 and the input transducer 1. As shown, in the present embodiment, the reflecting device 3 is configured as a reflecting grating including 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.
The input transducer 1 is connected to a power supply. When the input transducer 1 is energized with an alternating current, the finger structure of the input transducer 1 excites a surface acoustic wave on the surface of the object, which propagates outwardly along the surface of the object surface. The surface acoustic wave then reaches the reflecting means 3 and is reflected by the reflecting means 3, the reflected surface acoustic wave being received again by the output transducer 2. The output transducer 2 converts the received surface acoustic waves into electrical signals, which are in turn converted into surface deformations of the object surface.
For example, maximum excitation (synchronization) is obtained if the acoustic wave wavelength coincides with the period of the electrodes. The period of the electrodes (sum of electrode spacing and electrode width) is then the wavelength of the acoustic wave and the following relationship exists:
wherein:
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 acoustic wave
lpElectrode spacing (i.e. half wavelength)
Thus, when the surface acoustic wave sound velocity v and the surface acoustic wave frequency f of the material are known, the electrode spacing can be directly obtained, and the surface strain can be obtained from the electrode spacing.
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 an exemplary arrangement of the deformation sensor 10 according to the invention on the battery housing 4. As shown, the deformation sensor 10 is arranged in a patch manner on the case surface of the battery case 4. Preferably, the deformation sensor 10 is disposed in a region where a large deformation is expected on the case surface of the battery case 4. Here, the deformation sensor 10 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 10 as described above, it is possible to directly detect the deformation of the lithium battery case. The deformation sensor 10 is easy to install, small in size, light in weight, low in cost, and can be adjusted in size arbitrarily with the size of the battery.
Claims (9)
1. A deformation sensor for detecting deformation of a surface of an object, the deformation sensor comprising:
an input transducer (1) connected to a power source and for exciting a surface acoustic wave on the object surface,
reflecting means (3) for reflecting surface acoustic waves excited by the input transducer,
an output transducer (2) receiving the surface acoustic waves reflected by the reflecting means (3),
the output transducer (2) can convert the received surface acoustic waves into electric signals, and the surface deformation of the surface of the object is obtained through the electric signals.
2. Deformation sensor according to claim 1, characterized in that the input transducer (1) comprises a piezoelectric substrate material and a finger-like metal membrane electrode arranged on the piezoelectric substrate material.
3. The deformation sensor according to claim 1, characterized in that the output transducer (2) comprises a piezoelectric substrate material and a finger-like metal film electrode disposed on the piezoelectric substrate material.
4. Deformation sensor according to claim 1, characterized in that the input transducer (1) and the output transducer (2) are mutually opposed crosswise, thus constituting a typical set of single-ended resonators.
5. Deformation sensor according to claim 1, characterized in that the reflecting means (3) comprise reflecting gratings arranged on one or both sides of the input transducer (1) and the output transducer (2).
6. The deformation sensor according to claim 5, wherein the reflection grating includes a plurality of strip-shaped metal film electrodes arranged side by side at a certain interval.
7. The deformation sensor according to claim 1, wherein the object surface is a surface of a battery cell housing, or a surface of a battery module housing.
8. A battery case (4) on the surface of which battery case (4) a deformation sensor according to any one of claims 1-7 is arranged in the form of a patch.
9. A battery having the battery case according to claim 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120691299.5U CN214848679U (en) | 2021-04-06 | 2021-04-06 | Deformation sensor, battery case and battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120691299.5U CN214848679U (en) | 2021-04-06 | 2021-04-06 | Deformation sensor, battery case and battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN214848679U true CN214848679U (en) | 2021-11-23 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120691299.5U Active CN214848679U (en) | 2021-04-06 | 2021-04-06 | Deformation sensor, battery case and battery |
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| CN (1) | CN214848679U (en) |
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2021
- 2021-04-06 CN CN202120691299.5U patent/CN214848679U/en active Active
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