CN217717890U

CN217717890U - Electric automobile retired power battery detection device based on FBG optical sensor

Info

Publication number: CN217717890U
Application number: CN202121682010.XU
Authority: CN
Inventors: 张嘉伟; 陈俊辉; 李程; 刘树林; 廖强强; 王倩; 申西宁; 李义仓; 王汝田; 尚海昆
Original assignee: Hanzhong Power Supply Co Of State Grid Shaanxi Electric Power Co; Xian University of Technology; Northeast Dianli University
Current assignee: Yulin Changjiang Power Transmission Engineering Co ltd
Priority date: 2021-07-22
Filing date: 2021-07-22
Publication date: 2022-11-01
Anticipated expiration: 2031-07-22

Abstract

The utility model discloses an electric automobile retired power battery detection device based on FBG optical sensor, which comprises a resistor, FBG optical sensor demodulation appearance, electrochemistry integrated tester and computer, it passes through the wire and links to each other with the fixed resistance of resistance output electric energy to be surveyed retired the group battery, resistance and electrochemistry integrated tester link to each other simultaneously and form main test loop, FBG optical sensor is near main test loop when testing, can be in real time and the current signal that accurate effectual measurement retired battery produced through FBG optical sensor, electromagnetic radiation's frequency is lower than the light wave, the light signal of transmission does not receive electromagnetic interference's influence in optic fibre, it is excellent to have the interference killing feature, measurement accuracy is high, moreover, the steam generator is simple in structure, response speed is fast, small grade advantage.

Description

Electric automobile retired power battery detection device based on FBG optical sensor

Technical Field

The utility model relates to an electric automobile retired battery measures the technique, concretely relates to electric automobile retired power battery detection device based on FBG optical sensor.

Background

At present, the use of conventional internal combustion engine-driven automobiles, which aggravate the generation of greenhouse gases and the consumption of fossil energy, is considered to be one of the major sources of urban environmental pollution. The rapid development of the battery technology enables the electric automobile to become an important carbon-free transportation mode, the electric automobile has the advantages of high efficiency, low noise, no tail gas emission and the like, and the electric automobile also has the potential of relieving environmental pollution and energy crisis, and plays a key role in the efficient utilization of energy. The power battery of the electric automobile is an important constituent part of the power battery, can provide continuous electric energy input for the electric automobile, and is widely applied to the electric automobile due to the advantages of small mass, high energy density, small volume and the like.

Although the electric automobile used at present is a new energy automobile harmless to the environment, the waste power batteries retired from the electric automobile still cause serious pollution to the environment, so that the electric automobile recycling system has great significance for recycling the retired power batteries of the electric automobile. Under normal conditions, the power battery of the electric automobile can be used for 15-20 years generally, while the power battery with the residual capacity lower than 80% can be retired from the electric automobile, the retired power battery is subjected to parameter detection and quality sorting again, and the retired power battery can still be continuously used in the fields of energy storage of a power grid, industrial illumination, power supply of electronic equipment and the like after being selected and combined.

In order to exert the whole value of the retired power battery of the electric automobile to the maximum extent, the sorting and parameter measurement of the battery with the utilization value are very necessary, wherein the real-time detection of the current of the retired battery is very important, the traditional current detection of the power battery of the electric automobile uses an open-loop Hall sensor and a closed-loop Hall sensor, and the two measuring devices are expensive, relatively complex in structure, large in size and not suitable for being popularized and used in a large quantity.

Disclosure of Invention

Not enough to prior art exists, the utility model aims to provide an electric automobile retirement power battery detection device based on FBG optical sensor of measurement accuracy height, simple structure has that the interference killing feature is excellent, response speed is fast, small advantage.

In order to achieve the above purpose, the utility model adopts the following technical scheme to realize:

an electric automobile retired power battery detection device based on an FBG optical sensor comprises a resistor, the FBG optical sensor, an FBG optical fiber sensor demodulator, an electrochemical comprehensive tester and a computer;

the retired battery pack is connected with the electrochemical comprehensive tester after being connected with the resistor to form a retired battery current testing loop, the FBG optical sensor is placed close to the retired battery current testing loop, an optical fiber output port of the FBG optical sensor is connected with an optical channel on the FBG optical sensor demodulator, and an output communication interface end of the FBG optical sensor demodulator is connected with the computer to form an integral testing system.

Further, the FBG optical sensor comprises an optical fiber, an acrylic sleeve, a ceramic contact pin and a magnetostrictive thin sheet; the ceramic contact pin is inserted into the acrylic sleeve and supported and fixed through the acrylic partition plates on two sides, optical fibers are arranged inside the ceramic contact pin, fiber Bragg Gratings (FBGs) are carved on the optical fibers, and magnetostrictive thin sheets are reliably adhered to the surfaces of the FBGs in the acrylic sleeve.

Further, the resistance value of the resistor is 1-6 k omega.

Furthermore, the optical fiber adopts 8/125 single-mode optical fiber, and the interface type of the optical fiber is FC/APC.

Compared with the prior art, the utility model, following technological effect has:

the utility model discloses a resistance, FBG optical sensor demodulation appearance, electrochemistry integrated tester and computer, it passes through the wire and links to each other the output electric energy with the fixed resistance of resistance to be surveyed the decommissioning group battery, resistance links to each other with electrochemistry integrated tester simultaneously and forms main test loop, FBG optical sensor is near main test loop when testing, can be in real time and the current signal that accurate effectual measurement decommissioning battery produced through FBG optical sensor, electromagnetic radiation's frequency is lower than the light wave, the light signal of transmission does not receive electromagnetic interference's influence in optic fibre, it is excellent to have the interference killing feature, high measurement accuracy, moreover, the steam generator is simple in structure, high response speed, small advantage such as.

The utility model discloses used ceramic contact pin among the device, inserting the stable transmission of optical signal in the realization optic fibre that ceramic contact pin can be more convenient to optic fibre, thereby the grid distance that uses the deformation of magnetostrictive material to change fiber grating demodulates out the size that the variable quantity corresponds the electric current, is a stable and passive optical current measuring device. The utility model discloses the device has advantages such as small, the precision is high, stability is good, the interference killing feature is strong, and optic fibre itself comprises the dielectric, need not power drive moreover, but wide application in engineering survey and scientific research field provide reliable experimental basis for electric automobile retired power battery is categorised and recycle.

Drawings

Fig. 1 is a schematic structural diagram of the FBG electric vehicle ex-service battery detection system of the present invention;

fig. 2 is a schematic diagram of an FBG optical sensor according to the present invention;

FIG. 3 is a schematic view of the structure of the ceramic ferrule of the present invention;

in the figure: 1-retired battery pack, 2-resistor, 3-FBG optical sensor, 4-FBG optical fiber sensor demodulator, 5-electrochemical comprehensive tester, 6-computer, 301-optical fiber, 302-acrylic sleeve, 303-plastic plate, 304-ceramic pin, 305-magnetostrictive sheet, 306-acrylic partition plate, 307-FBG.

Detailed Description

The following examples are provided to explain the present invention in further detail.

As shown in fig. 1, the utility model discloses electric automobile retired power battery detection device based on FBG optical sensor, including retired group battery 1, resistance 2, FBG optical sensor 3, FBG optical sensor demodulation appearance 4, electrochemistry integrated tester 5 and computer 6.

Retired battery pack 1 is connected with resistance 2, resistance 2 is connected with electrochemistry comprehensive tester 5, electrochemistry comprehensive tester 5 is as power battery's reliable load end, simultaneously record the performance parameter of battery, FBG optical sensor 3 is close to retired battery current test loop, resistance 2 adopts high-power resistance, simultaneously FBG optical sensor 3's optic fibre output port links to each other with the optical channel on FBG optical sensor demodulation instrument 4, FBG optical sensor demodulation instrument 4's output communication interface end links to each other with computer 6 and constitutes whole test system.

The tested retired battery pack is connected with a resistor with a fixed resistance value through a wire to output electric energy, the resistor is connected with an electrochemical comprehensive tester to form a main test loop, the FBG optical sensor is close to the main test loop during testing, and the resistance value of the resistor is 1-6 k omega.

As shown in fig. 2, the FBG optical sensor 3 includes an optical fiber 301, an acrylic sleeve 302, a plastic plate 303, a ceramic ferrule 304, a magnetostrictive sheet 305, and an acrylic spacer 306. The FBG optical sensor is characterized in that a circular acrylic sleeve is arranged on the periphery of the FBG optical sensor, a ceramic inserting needle is inserted in the middle of the sleeve, acrylic partition plates 306 playing a supporting role are arranged at the tail ends of the left side and the right side of the acrylic sleeve 302, a plastic plate 303 is used for connecting an optical fiber and the ceramic inserting needle, an optical fiber 301 is arranged in the ceramic inserting needle 304, an optical fiber grating FBG307 is carved on the optical fiber 301 arranged in the ceramic inserting needle, the optical fiber 301 and the ceramic inserting needle 304 are integrally and reliably nested and are perpendicular to the center of the acrylic partition plates 306 arranged in the middle to be fixed, a magnetostrictive sheet 305 is reliably adhered to the surface of the optical fiber grating FBG307 in the ceramic inserting needle 304 to be fixed on the surface of the optical fiber grating FBG307, the optical fiber adopts 8/125 single-mode fiber, and the interface type is FC/APC.

As shown in fig. 3, in the ceramic ferrule 304, the fiber core of the optical fiber 301 is engraved with the fiber grating FBG307, the portion of the optical fiber 301 engraved with the fiber grating FBG307 is inserted into the ceramic ferrule 304 and bonded and fixed, and the surface of the fiber grating FBG307 is further bonded with the magnetostrictive sheet 305, thereby forming a firm structure.

When the retired battery supplies power for a resistor for testing, a magnetic field changing in real time is generated outside a test loop lead, at the moment, a magnetostrictive material is slightly deformed under the action of the magnetic field, the change of the grating pitch of the fiber bragg grating leads to the wavelength shift of the fiber bragg grating, and further leads to the wavelength change of the output spectral characteristics, the FBG fiber bragg grating demodulator calibrates and analyzes the variable quantity of the fiber bragg grating, so that the fiber bragg grating wavelength shift caused by the magnetic field change is obtained, the model fed back by the FBG fiber bragg grating demodulator 4 is sent to a computer for analysis and processing, the size of the current corresponding to the variable quantity is demodulated, and the precise current signal generated by the retired battery is obtained.

The utility model discloses a concrete operating procedure as follows:

step 1, opening an FBG optical fiber sensor demodulator 4, an electrochemical comprehensive tester 5 and a computer 6, connecting a decommissioned battery pack 1 with a resistor 2, connecting the resistor 2 with the electrochemical comprehensive tester 5, reliably grounding the electrochemical comprehensive tester 5, recording parameters such as the resistance value of the test, and the like, so that the decommissioned battery pack outputs electric energy to the outside and forms a stable test main loop.

And 2, stably placing the FBG optical sensor 3 on one side of a lead of the test main loop, and setting a fixed distance between the sensor and the lead in each test to minimize the measurement error.

And 3, sending the model fed back by the FBG optical fiber sensor demodulator 4 to a computer for analysis and processing to obtain an optical signal acquired in real time and a demodulated current change signal.

And 4, storing the data stored in the computer and exporting the acquired signals.

Claims

1. The utility model provides an electric automobile retires power battery detection device based on FBG optical sensor which characterized in that: the device comprises a resistor (2), an FBG optical sensor (3), an FBG optical fiber sensor demodulator (4), an electrochemical comprehensive tester (5) and a computer (6);

retired battery pack connecting resistance (2) back links to each other with electrochemistry comprehensive test instrument (5) and forms retired battery current test circuit, FBG optical sensor (3) are close to retired battery current test circuit and place, FBG optical sensor (3) optic fibre output port links to each other with the optical channel on FBG optical sensor demodulation appearance (4), the output communication interface end of FBG optical sensor demodulation appearance (4) links to each other with computer (6) and constitutes whole test system.

2. The FBG optical sensor-based detection device for the retired power battery of the electric vehicle as claimed in claim 1, wherein the FBG optical sensor (3) comprises an optical fiber (301), an acrylic sleeve (302), a ceramic ferrule (304) and a magnetostrictive sheet (305); the ceramic contact pin (304) is inserted into the acrylic sleeve (302) and supported and fixed through acrylic partition plates (306) on two sides, an optical fiber (301) is arranged inside the ceramic contact pin (304), an optical fiber grating (FBG) (307) is carved on the optical fiber (301), and a magnetostrictive thin sheet (305) is reliably adhered to the surface of the optical fiber grating FBG in the acrylic sleeve (302).

3. The FBG optical sensor-based detection device for the retired power battery of the electric vehicle as claimed in claim 1, wherein the resistance value of the resistor (2) is 1-6 k Ω.

4. The FBG optical sensor-based electric vehicle retired power battery detection device as claimed in claim 1, wherein the optical fiber (301) is 8/125 single mode fiber with FC/APC interface type.