CN115842182A - Distributed optical fiber temperature measurement system and temperature measurement method for cascade energy storage battery - Google Patents
Distributed optical fiber temperature measurement system and temperature measurement method for cascade energy storage battery Download PDFInfo
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- CN115842182A CN115842182A CN202211509113.5A CN202211509113A CN115842182A CN 115842182 A CN115842182 A CN 115842182A CN 202211509113 A CN202211509113 A CN 202211509113A CN 115842182 A CN115842182 A CN 115842182A
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Abstract
The invention provides a distributed optical fiber temperature measurement system and a temperature measurement method for a cascade energy storage battery, which comprise the following steps: the temperature sensing optical fiber is laid on the cascade energy storage battery module; the temperature measuring module is connected with the temperature sensing optical fiber and used for emitting laser to the temperature sensing optical fiber and receiving a laser signal reflected by the temperature sensing optical fiber; the data processing module is connected with the temperature measuring module and used for processing the reflected laser signals to obtain temperature data of each point of the temperature sensing optical fiber; the cascade energy storage battery module comprises a battery inserting box, a plurality of batteries are inserted in the inserting box, and the positive electrode of each battery is connected with the negative electrode of the other battery through a conducting plate; the temperature sensing optical fiber is coiled on the surface of each conductive plate, and a first coiling structure is formed on the surface of each conductive plate; the temperature measuring method is realized by adopting the temperature measuring system. The temperature sensing optical fiber is coiled and laid on the battery electrode, and the temperature distribution measurement of the contact flexible layout under the complex electromagnetic environment is realized by utilizing the physical characteristics of the optical fiber.
Description
Technical Field
The invention relates to the technical field of distributed optical fiber temperature measurement, in particular to a distributed optical fiber temperature measurement system and a temperature measurement method for a cascade energy storage battery.
Background
The state of health of a chemical battery mainly includes the continuous change of its electrical and thermodynamic properties. The internal processes of many lithium batteries are associated with a temperature rise of the battery, and thus the battery temperature is an important indicator of the state of health of the battery.
In practical application, the batteries are often connected in series and parallel to meet the voltage and capacity requirements of the application on the battery module, and the contact resistance between the batteries may cause the battery cells to bear uneven current, thereby causing temperature rise and finally affecting the capacity and service life of the whole battery pack. Especially, the thermal runaway of the single battery can possibly cause spreading among modules, the running state of the single battery can be found and timely controlled in the early stage of abnormal change, and the battery faults and even accidents are reduced.
The optical fiber sensing has a series of unique advantages of electromagnetic interference resistance, long transmission distance, easiness in forming a distributed sensing network and the like, and the distributed optical fiber temperature measuring system is based on the optical fiber backscattering principle and realizes the acquisition of quasi-continuous temperature information of an all-optical fiber channel. However, the accuracy and response time of distributed optical fiber temperature measurement have requirements on the contact length of optical fibers, the contact of a battery cell is very small, and particularly for a cascade energy storage battery, the temperature value cannot be accurately obtained in time due to direct contact of the optical fibers. The fiber bragg grating temperature sensor is relatively large and cannot be arranged at a battery, and the cost is relatively high. Accordingly, improvements are needed.
Disclosure of Invention
In view of the above-mentioned drawbacks and deficiencies of the prior art, it is desirable to provide a distributed optical fiber temperature measurement system and a temperature measurement method for cascaded energy storage cells.
In a first aspect, a distributed optical fiber temperature measurement system for cascaded energy storage batteries is provided, which includes: the temperature sensing optical fiber is laid on the cascade energy storage battery module; the temperature measuring module is connected with the temperature sensing optical fiber and used for emitting laser to the temperature sensing optical fiber and receiving a laser signal reflected by the temperature sensing optical fiber; the data processing module is connected with the temperature measuring module and used for processing the reflected laser signals to obtain temperature data of each point of the temperature sensing optical fiber; the cascade energy storage battery module comprises a battery inserting box, a plurality of batteries are inserted in the battery inserting box, and the positive electrode of each battery is connected with the negative electrode of the other battery through a conducting plate; the temperature sensing optical fiber is coiled on the surface of each conductive plate, and a first coiling structure is formed on the surface of each conductive plate.
According to the technical scheme provided by the embodiment of the application, the first coiling structure is an annular coiling structure; the length of the temperature sensing optical fiber of each annular coiling structure is not less than 1 meter, the number of the rings is not less than 3 circles, and the diameter is not less than 50 millimeters.
According to the technical scheme provided by the embodiment of the application, the length of the temperature sensing optical fiber between each first winding structure is not less than 4 meters.
According to the technical scheme provided by the embodiment of the application, the temperature sensing optical fibers between the first coiling structures are coiled to form the second coiling structure.
According to the technical scheme provided by the embodiment of the application, the system further comprises an alarm module, wherein the alarm module is connected with the data processing module; and when the temperature data monitored by the data processing module exceeds a preset threshold value, sending an alarm signal to the alarm module.
According to the technical scheme provided by the embodiment of the application, the temperature sensing optical fiber is a multimode optical fiber.
In a second aspect, a distributed optical fiber temperature measurement method for a cascade energy storage battery is provided, which is implemented by using the temperature measurement system described above, and includes the following steps:
laying a temperature sensing optical fiber on the cascade energy storage battery module;
calibrating the position of each first winding structure, wherein the temperature of the calibrated position corresponds to the temperature of the battery electrode;
emitting laser to the temperature sensing optical fiber and receiving a laser signal reflected by the temperature sensing optical fiber;
and processing the reflected laser signals to obtain temperature data of each point of the temperature sensing optical fiber, and further obtaining a calibration position, namely temperature data of the battery electrode.
According to the technical scheme provided by the embodiment of the application, calibrating the position of each first winding structure comprises the following steps:
determining fiber lengths of the first and second coiled structures;
the optical fiber position corresponding to the length of each first coiling structure is a temperature measurement area of the battery electrode, and each temperature measurement area is calibrated;
each calibration temperature measurement area corresponds to a battery electrode temperature measurement point;
and obtaining the temperature data of each temperature measuring area, and obtaining the temperature data of the corresponding battery electrode.
According to the technical scheme provided by the embodiment of the application, the temperature measuring method further comprises the following steps: monitoring the obtained temperature data of each battery electrode;
and if the temperature data exceeds a preset threshold value, judging that the corresponding battery electrode temperature is abnormal, and sending an alarm signal.
The invention has the beneficial effects that:
a plurality of batteries are arranged in the battery inserting box of the cascade energy storage battery, and the batteries are tightly arranged. The distributed optical fiber is directly laid, so that the problem of inaccurate temperature measurement exists; and the fiber grating temperature sensor is complex in arrangement and very high in cost. The positive electrode and the negative electrode of every two batteries in the plug-in box are connected through a conductive plate, and the distributed optical fiber is laid on the conductive plate to measure the temperature of the battery electrode. The problem that the contact length of the optical fiber and the electrode contact is less than 10 cm and the measurement accuracy of optical fiber temperature sensing is influenced because the area of the electrode contact is very small and the optical fiber is directly laid is solved. The temperature sensing optical fiber is coiled and laid on the battery electrode, so that the requirement of the spatial resolution of the distributed optical fiber is met, and the temperature value can be quickly and accurately obtained. Meanwhile, the temperature sensing optical fiber is wound to form a coiled structure and is laid and arranged at each electric core contact, and the temperature distribution measurement of the contact type flexible layout in the complex electromagnetic environment is realized by utilizing the physical characteristics of the optical fiber.
Drawings
Other features, objects and advantages of the present application will become more apparent upon reading of the following detailed description of non-limiting embodiments thereof, made with reference to the accompanying drawings in which:
fig. 1 is a schematic structural diagram of a distributed optical fiber temperature measurement system according to the present invention.
Description of reference numerals:
1. a data processing module;
2. a temperature measuring module;
3. a temperature sensing optical fiber; 31. a first winding structure; 32. a second coiled configuration;
4. cascading energy storage battery modules; 41. a battery; 42. and a conductive plate.
Detailed Description
The present application will be described in further detail with reference to the following drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not to be construed as limiting the invention. It should be noted that, for convenience of description, only the portions related to the present invention are shown in the drawings.
It should be noted that, in the present application, the embodiments and features of the embodiments may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
Example one
A distributed fiber optic thermometry system for cascading energy storage cells, comprising: the temperature sensing optical fiber 3 is laid on the cascade energy storage battery module 4; the temperature measuring module 2 is connected with the temperature sensing optical fiber 3 and used for emitting laser to the temperature sensing optical fiber 3 and receiving a laser signal reflected by the temperature sensing optical fiber 3; the data processing module 1 is connected with the temperature measuring module 2 and used for processing the reflected laser signals to obtain temperature data of each point of the temperature sensing optical fiber 3; the cascade energy storage battery module 4 comprises a battery inserting box, a plurality of batteries 41 are inserted in the battery inserting box, and the positive electrode of each battery 41 is connected with the negative electrode of another battery 41 through a conducting plate 42; the temperature sensing optical fiber 3 is wound on the surface of each conductive plate 42, and a first winding structure 31 is formed on the surface of the conductive plate 42.
Referring to fig. 1, the temperature measuring module 2 is generally a temperature measuring host, specifically, a distributed optical fiber temperature measuring host, and supports setting temperature thresholds in multiple zones.
The data processing module 1 is generally an upper computer or a computer, and is connected with the temperature measuring module 2 through a USB interface.
The cascade energy storage battery module is generally a cascade energy storage battery and is provided with a battery plug box, and a plurality of batteries are arranged in the battery plug box. And the positive end or the negative end of the battery positioned at the end part is provided with a conductive plate, and the positive electrode and the negative electrode of each two batteries are also connected through the conductive plate. The temperature of the battery electrode is measured by measuring the temperature of the conductive plate, and then the battery temperature is monitored.
The first coil 31 is located at the conductive plate 42 intermediate the two cells, it being understood that the temperature of both cells is monitored simultaneously.
A plurality of groups of cells are arranged in the plug-in box 41 of one cascade energy storage cell, and the cells are closely arranged. The distributed optical fiber is directly laid, so that the problem of inaccurate temperature measurement exists; and the fiber grating temperature sensor is complex in arrangement and very high in cost. The positive electrode and the negative electrode of every two batteries in the plug-in box 41 are connected through a conductive plate, and the distributed optical fiber is laid on the conductive plate to measure the temperature of the battery electrode. The contact area of the electrode is small, and the length of the contact between the optical fiber and the electrode contact is less than 10 cm when the optical fiber is directly laid, so that the measurement accuracy of optical fiber temperature sensing is influenced. The temperature sensing optical fiber 3 is coiled and laid on the battery electrode, so that the requirement of the spatial resolution of the distributed optical fiber is met, and the temperature value can be quickly and accurately obtained. Meanwhile, the temperature sensing optical fiber 3 is wound to form a coiled structure to be laid at each electric core contact point, and the temperature distribution measurement of the contact type flexible layout in the complex electromagnetic environment is realized by utilizing the physical characteristics of the optical fiber.
In an embodiment of the present invention, the first coil structure 31 is an annular coil structure; the length of the temperature sensing optical fiber 3 of each annular coiling structure is not less than 1 meter, the number of the rings is not less than 3 circles, and the diameter is not less than 50 millimeters.
Specifically, through experimental tests, the length of the optical fiber for testing the temperature of the battery electrode is not less than 1 meter, and when the diameter is not less than 50 millimeters, the accuracy error of the tested temperature is less than +/-1%, and the repeatability error is less than +/-1%.
In an embodiment of the present invention, the length of the temperature sensitive optical fiber 3 between each first winding structure 31 is not less than 4 meters.
Specifically, the distributed optical fiber temperature sensing has a certain spatial resolution requirement, and the distance between every two first coiled structures 31, that is, the distance between two temperature measurement points, is not less than 4 m, so that the temperature interference between the front and rear temperature measurement points is avoided.
In an embodiment of the present invention, the temperature-sensitive optical fiber 3 between each of the first coiled structures 31 is also coiled to form the second coiled structure 32.
Specifically, the space in the inserting box 41 is limited, and a circular ring is wound between each first winding structure 31, but an elliptical ring can be wound, so that the space can be saved.
In one embodiment of the invention, the system further comprises an alarm module, wherein the alarm module is connected with the data processing module 1; when the temperature data monitored by the data processing module 1 exceeds a preset threshold value, an alarm signal is sent to the alarm module.
Specifically, in the charging and discharging process of the battery, the temperature at the electrode contact is heated too fast or exceeds the warning temperature, and an alarm is given in time. And the staff quickly finds the corresponding battery electrode according to the calibrated temperature measuring area, namely finds the problem battery and processes the problem battery in time.
In an embodiment of the present invention, the temperature sensing optical fiber 3 is a multimode optical fiber.
In particular, multimode fibers allow different modes of light to be transmitted over one fiber, facilitating temperature measurements.
Example two
A distributed optical fiber temperature measurement method for a cascade energy storage battery is realized by adopting the temperature measurement system, and comprises the following steps:
laying a temperature sensing optical fiber 3 on the cascade energy storage battery;
calibrating the position of each first winding structure 31, wherein the temperature of the calibrated position corresponds to the temperature of the battery electrode;
emitting laser to the temperature sensing optical fiber 3 and receiving a laser signal reflected by the temperature sensing optical fiber 3;
and processing the reflected laser signals to obtain temperature data of each point of the temperature sensing optical fiber 3, and further obtaining a calibration position, namely temperature data of the battery electrode.
Specifically, a laser light source is arranged in the temperature measurement module 2, the laser light source emits laser light into the temperature sensing optical fiber 3, the laser light interacts with optical fiber molecules to generate extremely weak back scattering light, and rayleigh light, anti-stokes light and stokes light are generated; the anti-Stokes light is sensitive to temperature and is signal light; the Stokes light is not sensitive to temperature and is reference light. Rayleigh light scattering light is isolated from backscattered signal light, penetrates through temperature-sensitive anti-Stokes signal light and temperature-insensitive Stokes reference light, is received by the same measuring channel, and the temperature measurement temperature can be calculated according to the light intensity ratio of the two light beams. The temperature measurement position is determined based on an optical time domain reflection technology, and the temperature measurement position of the temperature sensing optical cable corresponding to the scattering signal can be determined by acquiring and measuring the echo time of the scattering signal through high-speed data.
In the application, the number of the cascade energy storage batteries in the cascade energy storage battery module 4 is large, the space is small, the distributed optical fiber occupies small space, the temperature sensing optical fiber 3 is laid at the electrode of the battery, the position of the optical fiber is determined, the temperature of the corresponding electrode can be obtained, and the temperature monitoring is further realized; the temperature is accurately and continuously sensed by adopting one optical fiber, the optical fiber is coiled and laid at the electrode contact, the contact area and the length of the optical fiber are increased, and the temperature change of all battery electrode contacts in the plug box is accurately and quickly monitored in real time.
In an embodiment of the present invention, calibrating the position of each first coiled structure 31 includes the following steps:
determining the fiber lengths of the first and second coiled structures 31 and 32;
the optical fiber position corresponding to the length of each first coiled structure 31 is a temperature measuring area of the battery electrode, and each temperature measuring area is calibrated;
each calibration temperature measurement area corresponds to a battery electrode temperature measurement point;
and obtaining the temperature data of each calibration temperature measurement area, and obtaining the temperature data of the corresponding battery electrode.
Specifically, when the lengths of the optical fibers of the first and second coiled structures 31 and 32 are determined, each temperature measuring area is laid with the determined length of the optical fiber. The optical fiber position of the temperature measurement area can be obtained in sequence according to the length of the optical fiber, the optical fiber position is calibrated to be the temperature measurement area, each temperature measurement area corresponds to the battery electrode, and the temperature of the corresponding battery electrode can be directly obtained in the temperature monitoring process.
In an embodiment of the present invention, the temperature measuring method further includes the following steps:
monitoring the obtained temperature data of each battery electrode;
and if the temperature data exceeds a preset threshold value, judging that the corresponding battery electrode temperature is abnormal, and sending an alarm signal.
Specifically, in the charging and discharging process of the battery, the temperature at the electrode contact is heated too fast or exceeds the warning temperature, and an alarm is given in time. And the staff quickly finds the corresponding battery electrode according to the calibrated temperature measuring area, namely finds the problem battery and processes the problem battery in time.
The above description is only a preferred embodiment of the application and is illustrative of the principles of the technology employed. It will be appreciated by a person skilled in the art that the scope of the invention as referred to in the present application is not limited to the embodiments with a specific combination of the above-mentioned features, but also covers other embodiments with any combination of the above-mentioned features or their equivalents without departing from the inventive concept. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.
Claims (9)
1. A distributed optical fiber temperature measurement system for cascading energy storage batteries, comprising:
the temperature sensing optical fiber (3) is laid on the cascade energy storage battery module (4);
the temperature measuring module (2) is connected with the temperature sensing optical fiber (3) and is used for emitting laser to the temperature sensing optical fiber (3) and receiving a laser signal reflected by the temperature sensing optical fiber (3);
the data processing module (1) is connected with the temperature measuring module (2) and is used for processing the reflected laser signals to obtain temperature data of each point of the temperature sensing optical fiber (3); wherein the content of the first and second substances,
the cascade energy storage battery module (4) comprises a battery plug box, a plurality of batteries (41) are inserted in the battery plug box, and the positive electrode of each battery (41) is connected with the negative electrode of another battery (41) through a conductive plate (42);
the temperature sensing optical fiber (3) is coiled at each conductive plate (42), and a first coiling structure (31) is formed on the surface of each conductive plate (42).
2. The distributed optical fiber temperature measurement system for the cascaded energy storage cells of claim 1,
the first coiled structure (31) is an annular coiled structure; the length of the temperature sensing optical fiber (3) of each annular coiling structure is not less than 1 meter, the number of the rings is not less than 3 circles, and the diameter is not less than 50 millimeters.
3. A distributed fibre optic thermometry system for cascaded energy storage cells according to claim 1, wherein the length of the temperature sensitive fibre (3) between each first coiled structure (31) is not less than 4 metres.
4. A distributed fibre optic thermometry system for cascaded energy storage cells according to claim 1, wherein the temperature sensitive fibre (3) between each first coiled structure (31) is also coiled to form a second coiled structure (32).
5. The distributed optical fiber temperature measurement system for the cascade energy storage battery according to claim 1, further comprising an alarm module, wherein the alarm module is connected with the data processing module (1); when the temperature data monitored by the data processing module (1) exceeds a preset threshold value, an alarm signal is sent to the alarm module.
6. The distributed optical fiber temperature measurement system for the cascaded energy storage batteries according to claim 1, wherein the temperature sensing optical fiber (3) is a multimode optical fiber.
7. A distributed optical fiber temperature measurement method for a cascade energy storage battery is characterized by being realized by the temperature measurement system of claims 1-6, and comprising the following steps:
laying a temperature sensing optical fiber (3) on the cascade energy storage battery module;
calibrating the position of each first coiled structure (31), wherein the temperature of the calibrated position corresponds to the temperature of the battery electrode;
emitting laser to the temperature sensing optical fiber (3) and receiving a laser signal reflected by the temperature sensing optical fiber (3);
and processing the reflected laser signals to obtain temperature data of each point of the temperature sensing optical fiber (3), and further obtaining a calibration position, namely temperature data of the battery electrode.
8. The distributed optical fiber temperature measurement method for the cascaded energy storage cells of claim 7,
the calibration of the position of each first coiled structure (31) comprises the following steps:
determining the fiber length of the first and second coiled structures (31, 32);
the optical fiber position corresponding to the length of each first coiled structure (31) is a temperature measuring area of the battery electrode, and each temperature measuring area is calibrated;
each calibration temperature measurement area corresponds to a battery electrode temperature measurement point;
and obtaining the temperature data of each calibration temperature measurement area, and obtaining the temperature data of the corresponding battery electrode.
9. The distributed optical fiber temperature measurement method for the cascaded energy storage battery according to claim 7, further comprising the following steps:
monitoring the obtained temperature data of each battery electrode;
and if the temperature data exceeds a preset threshold value, judging that the corresponding battery electrode temperature is abnormal, and sending an alarm signal.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116026491A (en) * | 2023-03-28 | 2023-04-28 | 北京神州普惠科技股份有限公司 | Battery management system and battery management method based on distributed optical fibers |
| CN117633939A (en) * | 2024-01-26 | 2024-03-01 | 山东浪潮数据库技术有限公司 | Fire control design method for energy storage cabinet |
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2022
- 2022-11-29 CN CN202211509113.5A patent/CN115842182A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116026491A (en) * | 2023-03-28 | 2023-04-28 | 北京神州普惠科技股份有限公司 | Battery management system and battery management method based on distributed optical fibers |
| CN117633939A (en) * | 2024-01-26 | 2024-03-01 | 山东浪潮数据库技术有限公司 | Fire control design method for energy storage cabinet |
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