Battery temperature sensing device based on two-dimensional photonic crystal

Abstract

The invention relates to the technical field of photoelectric sensing, and discloses a two-dimensional photonic crystal-based battery temperature sensing device, which comprises a two-dimensional photonic crystal substrate module, an internal waveguide structure module, an annular resonant cavity module, a light source module and a detection module, forming a photonic band gap; the optical fiber module is embedded in the two-dimensional photonic crystal substrate module and used for transmitting optical signals; the annular resonant cavity module is coupled with the internal waveguide structure module, and the resonant wavelength of the annular resonant cavity module shifts along with the temperature change; the input module is used for inputting broadband optical signals to the internal waveguide structure module; and the receiving module is used for receiving the transmitted spectrum output by the annular resonant cavity module. According to the battery temperature sensing device based on the two-dimensional photonic crystal, non-contact temperature measurement with high sensitivity and quick response is realized through coupling of the internal waveguide and the annular resonant cavity and by utilizing the characteristic that the resonant wavelength of the photonic crystal changes along with the temperature.

Description

Technical Field

[0001] The present invention relates to the technical field of optoelectronic sensing, and specifically to a battery temperature sensing device based on two-dimensional photonic crystals. Background Technique

[0002] At present, the technology of new energy battery packs has been relatively mature. New energy battery packs can be widely used and operate stably in electric vehicles. In order to monitor the temperature of battery cells in new energy battery packs, temperature sensors are usually installed on the battery cells. With the development of technology, the volume of new energy battery packs is getting smaller and smaller, and the integration degree is getting higher and higher, which can meet the installation and use requirements of different vehicle models. However, the reduction in the volume of battery cells also poses higher requirements for the installation space and installation method of temperature sensors.

[0003] Battery temperature monitoring is a key technology to ensure the safe operation and extend the service life of batteries. Traditional temperature sensors such as thermocouples or thermistors have problems such as slow response speed, poor anti-electromagnetic interference ability, and difficulty in miniaturization. Photonic crystals have been widely used in the sensing field in recent years due to their unique optical properties. In the prior art, the sensitivity of one-dimensional photonic crystal temperature sensors is limited, while the processing of three-dimensional photonic crystals is complex. Two-dimensional photonic crystals combine design flexibility and preparation feasibility, but their application in battery temperature monitoring has not been fully developed. In view of this, we propose a battery temperature sensing device based on two-dimensional photonic crystals. Summary of the Invention

[0004] The purpose of the present invention is to provide a battery temperature sensing device based on two-dimensional photonic crystals to solve the problems raised in the above background technique.

[0005] To achieve the above purpose, the present invention provides the following technical solution: A battery temperature sensing device based on two-dimensional photonic crystals, comprising:

[0006] A two-dimensional photonic crystal substrate module, the lattice structure of the two-dimensional photonic crystal substrate module is composed of periodically arranged dielectric columns, forming a photonic band gap;

[0007] An internal waveguide structure module, embedded in the two-dimensional photonic crystal substrate module, for transmitting optical signals;

[0008] A ring resonator module, coupled with the internal waveguide structure module, and the resonance wavelength of the ring resonator module shifts with temperature change;

[0009] A light source module, for inputting broadband optical signals into the internal waveguide structure module;

[0010] A detection module, for receiving the transmission spectrum output by the ring resonator module and calculating the battery temperature by analyzing the resonance wavelength shift amount.

[0011] Optionally, the dielectric column material of the two-dimensional photonic crystal substrate module is silicon or silicon nitride, the arrangement of the dielectric columns is a square lattice or a hexagonal lattice, and the lattice constant ranges from 200 nm to 500 nm.

[0012] Optionally, the ring resonator module is formed by the absence of dielectric columns, its radius and the spacing of the internal waveguide structure module satisfy the phase matching condition, and the temperature sensitivity of the resonance wavelength of the ring resonator module is not less than 0.1 nm / °C.

[0013] Optionally, the light source module is a superluminescent light-emitting diode or a tunable laser, and the output wavelength covers the resonance wavelength range of the ring resonator module.

[0014] Optionally, the detection module includes a spectral analyzer and a data processing unit. The data processing unit establishes a calibration curve based on the relationship between the change in the resonance peak position of the transmission spectrum and the temperature, and calculates the battery temperature in real time.

[0015] The present invention also proposes a method for monitoring battery temperature, which uses the above battery temperature sensing device for monitoring, and is characterized by including the following steps:

[0016] S1. Attach the two-dimensional photonic crystal substrate module to the battery surface so that the ring resonator module is in thermal contact with the battery;

[0017] S2. Input an optical signal into the internal waveguide structure module through the light source module to excite the resonance mode of the ring resonator module;

[0018] S3. The detection module acquires the transmission spectrum and extracts the resonance wavelength offset;

[0019] S4. Calculate the real-time temperature of the battery according to the pre-stored wavelength-temperature relationship model.

[0020] Compared with the prior art, the present invention provides a battery temperature sensing device based on two-dimensional photonic crystals, which has the following beneficial effects:

[0021] 1. The battery temperature sensing device based on two-dimensional photonic crystals realizes non-contact temperature measurement with high sensitivity and fast response by coupling the internal waveguide and the ring resonator and utilizing the characteristic that the resonance wavelength of the photonic crystal changes with temperature.

[0022] 2. The battery temperature sensing device based on two-dimensional photonic crystal has the advantages of high sensitivity. The resonant wavelength of the ring resonator is sensitive to temperature changes, and the sensitivity can reach 0.15 nm / °C. It has the advantage of fast response: the photonic crystal structure has a small heat capacity, and the response time is less than 1 ms. It has the advantage of anti-interference. The optical signal transmission is not affected by the electromagnetic field and is suitable for complex battery working environments. It has the advantage of miniaturization. The size of the two-dimensional photonic crystal structure is micron-level and can be integrated on the surface or inside of the battery. Detailed implementation manners

[0023] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0024] The present invention provides a technical solution: a battery temperature sensing device based on two-dimensional photonic crystal, including: a two-dimensional photonic crystal substrate module, an internal waveguide structure module, a ring resonator module, a light source module, and a detection module;

[0025] Among them, the lattice structure of the two-dimensional photonic crystal substrate module is composed of periodically arranged dielectric columns to form a photonic bandgap; it is embedded in the two-dimensional photonic crystal substrate module for transmitting optical signals; it is coupled with the internal waveguide structure module, and the resonant wavelength of the ring resonator module shifts with temperature changes; it is used to input broadband optical signals to the internal waveguide structure module; it is used to receive the transmission spectrum output by the ring resonator module and calculate the battery temperature by analyzing the resonant wavelength shift amount.

[0026] It should be noted that the dielectric column material of the two-dimensional photonic crystal substrate module is silicon or silicon nitride, the arrangement of the dielectric columns is a square lattice or a hexagonal lattice, and the lattice constant ranges from 200 nm to 500 nm. The ring resonator module is formed by the absence of dielectric columns, and its radius and the spacing of the internal waveguide structure module satisfy the phase matching condition, and the resonant wavelength temperature sensitivity of the ring resonator module is not less than 0.1 nm / °C.

[0027] The light source module is a superluminescent light-emitting diode or a tunable laser, and the output wavelength covers the resonant wavelength range of the ring resonator module. The detection module includes a spectral analyzer and a data processing unit. The data processing unit establishes a calibration curve according to the relationship between the change in the resonant peak position of the transmission spectrum and temperature, and calculates the battery temperature in real time.

[0028] This embodiment also proposes a battery temperature monitoring method, which uses the above battery temperature sensing device for monitoring, including the following steps:

[0029] S1. Attach the two-dimensional photonic crystal substrate module to the surface of the battery so that the ring resonator module is in thermal contact with the battery;

[0030] S2. Input an optical signal into the internal waveguide structure module through the light source module to excite the resonant mode of the ring resonator module;

[0031] S3. The detection module obtains the transmission spectrum and extracts the resonant wavelength offset;

[0032] S4. Calculate the real-time temperature of the battery according to the pre-stored wavelength-temperature relationship model.

[0033] The above text has generally described the present invention in detail. However, based on the present invention, some modifications or improvements can be made, which are obvious to those of ordinary skill in the art. Therefore, modifications or improvements that do not depart from the spirit of the present invention are within the protection scope of the present invention.

Claims

1. A battery temperature sensing device based on two-dimensional photonic crystals, characterized in that: include: A two-dimensional photonic crystal substrate module, wherein the lattice structure of the two-dimensional photonic crystal substrate module is composed of periodically arranged dielectric columns to form a photonic band gap; An internal waveguide structure module, embedded in the two-dimensional photonic crystal substrate module, for transmitting optical signals; A ring-shaped resonant cavity module is coupled to the internal waveguide structure module, and the resonant wavelength of the ring-shaped resonant cavity module shifts with temperature changes; A light source module, used for inputting a broadband optical signal into the internal waveguide structure module; The detection module is used to receive the transmission spectrum output by the annular resonant cavity module and calculate the battery temperature by analyzing the resonant wavelength offset.

2. A battery temperature sensing device based on two-dimensional photonic crystal according to claim 1, characterized in that: The dielectric column material of the two-dimensional photonic crystal substrate module is silicon or silicon nitride, the dielectric columns are arranged in a square lattice or a hexagonal lattice, and the lattice constant ranges from 200nm to 500nm.

3. A battery temperature sensing device based on two-dimensional photonic crystal according to claim 1, characterized in that: The annular resonant cavity module is formed by the missing dielectric column, the radius of the annular resonant cavity module and the spacing between the internal waveguide structure module meet the phase matching condition, and the resonant wavelength temperature sensitivity of the annular resonant cavity module is not less than 0.1nm / °C.

4. A battery temperature sensing device based on two-dimensional photonic crystal according to claim 1, characterized in that: The light source module is a superluminescent diode or a tunable laser, and the output wavelength covers the resonant wavelength range of the annular resonant cavity module.

5. A battery temperature sensing device based on two-dimensional photonic crystal according to claim 1, characterized in that: The detection module includes a spectrum analyzer and a data processing unit. The data processing unit establishes a calibration curve according to the relationship between the change of the resonance peak position of the transmission spectrum and the temperature, and calculates the battery temperature in real time.

6. A battery temperature monitoring method, using the battery temperature sensing device according to any one of claims 1 to 5 for monitoring, characterized in that: The following steps are involved: S1, attaching the two-dimensional photonic crystal substrate module to the surface of the battery so that the annular resonant cavity module is in thermal contact with the battery; S2, inputting an optical signal to the internal waveguide structure module through the light source module to excite the resonance mode of the ring resonant cavity module; S3, the detection module obtains the transmission spectrum and extracts the resonant wavelength offset; S4. Calculate the real-time temperature of the battery according to the pre-stored wavelength-temperature relationship model.