CN102052976B - Device and method for measuring internal temperature of lithium ion battery - Google Patents
Device and method for measuring internal temperature of lithium ion battery Download PDFInfo
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- CN102052976B CN102052976B CN201010530433A CN201010530433A CN102052976B CN 102052976 B CN102052976 B CN 102052976B CN 201010530433 A CN201010530433 A CN 201010530433A CN 201010530433 A CN201010530433 A CN 201010530433A CN 102052976 B CN102052976 B CN 102052976B
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- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 56
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 28
- 238000000034 method Methods 0.000 title claims abstract description 24
- 239000000523 sample Substances 0.000 claims abstract description 61
- 239000013307 optical fiber Substances 0.000 claims abstract description 36
- 230000005284 excitation Effects 0.000 claims abstract description 8
- 230000008878 coupling Effects 0.000 claims abstract description 6
- 238000010168 coupling process Methods 0.000 claims abstract description 6
- 238000005859 coupling reaction Methods 0.000 claims abstract description 6
- 238000009826 distribution Methods 0.000 claims abstract description 6
- 238000005259 measurement Methods 0.000 claims description 30
- 239000000463 material Substances 0.000 claims description 12
- 230000007246 mechanism Effects 0.000 claims description 12
- 239000000835 fiber Substances 0.000 claims description 10
- 238000005498 polishing Methods 0.000 claims description 9
- 230000008569 process Effects 0.000 claims description 9
- 238000005260 corrosion Methods 0.000 claims description 8
- 230000007797 corrosion Effects 0.000 claims description 7
- 230000006698 induction Effects 0.000 claims description 3
- 239000007769 metal material Substances 0.000 claims description 3
- 238000004806 packaging method and process Methods 0.000 claims description 3
- 238000012360 testing method Methods 0.000 claims description 3
- 238000002834 transmittance Methods 0.000 claims description 2
- 238000009529 body temperature measurement Methods 0.000 abstract description 5
- 238000001514 detection method Methods 0.000 abstract description 4
- 238000012545 processing Methods 0.000 abstract description 4
- 238000013461 design Methods 0.000 description 9
- 238000010586 diagram Methods 0.000 description 6
- 230000008901 benefit Effects 0.000 description 5
- 229910052802 copper Inorganic materials 0.000 description 4
- 239000010949 copper Substances 0.000 description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 3
- 230000004044 response Effects 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000008151 electrolyte solution Substances 0.000 description 2
- 229910052744 lithium Inorganic materials 0.000 description 2
- 229910052761 rare earth metal Inorganic materials 0.000 description 2
- 150000002910 rare earth metals Chemical class 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000007123 defense Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000003487 electrochemical reaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000004861 thermometry Methods 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000001429 visible spectrum Methods 0.000 description 1
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- Investigating, Analyzing Materials By Fluorescence Or Luminescence (AREA)
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Abstract
The invention discloses a measuring device for the internal temperature of a lithium ion battery, which comprises a fluorescence excitation light source, a light source driving circuit, a light path coupling system and a fluorescence signal detection and processing system, wherein the fluorescence excitation light source, the light source driving circuit, the light path coupling system and the fluorescence signal detection and processing system are arranged in a box body; the method for measuring the internal temperature of the lithium ion battery comprises the steps of embedding a plurality of fluorescent optical fiber temperature measuring probes into the battery according to certain distribution when the lithium ion battery is manufactured; according to the arrangement distribution of the plurality of fluorescent optical fiber temperature measuring probes, a plurality of optical fiber probe devices which completely correspond to each other are manufactured and are respectively connected to the interface ends of the multi-point temperature measuring device in the lithium ion battery; during temperature measurement, a plurality of bare optical fibers in a plurality of optical fiber probe devices are aligned with a plurality of optical fibers exposed on the surface of the lithium ion battery, so that a fluorescence signal reflected by each temperature measurement probe embedded in the lithium ion battery can be measured, and the temperature sensed by each temperature measurement probe is read through a signal demodulation processing device.
Description
Technical field
The invention belongs to technical field of optical fiber sensing, relate to a kind of measurement mechanism and measuring method of inside lithium ion cell temperature.
Background technology
Lithium ion battery is because WV is high, power density and energy density are high, have extended cycle life, self discharge is little, memory-less effect, advantage such as pollution-free; Its application expands to energy traffic and national defense and military fields from information products; Concrete use as from mobile phone, palm PC, notebook etc.; To electric automobile, peak load regulation network, sun power, wind energy electric power storage station etc., military submarine, underwater robot, soldier system of ground force, machine soldier, unmanned aerial vehicle, satellite, the airship etc. then contained.
But lithium ion battery potential safe temperature, especially power in application is used the lithium ion battery group, has become a bottleneck of its development of restriction.Lithium ion battery has high energy density; In charge and discharge process; Be accompanied by number of chemical, electrochemical reaction and transmission course of material; Some is reflected under the situation of open circuit still carries out, and these processes can cause the generation of heat, and the heat of these generations can not be lost to the accumulation that will cause the inside battery heat in the environment fully.If the accumulation of heat causes the high temperature dot of inside battery, just might cause the thermal runaway of battery.Therefore, temperature is all influential to the various aspects of performance of lithium ion battery, comprises working condition, cycle efficieny, capacity, power, security, reliability, consistance and the life-span etc. of electro-chemical systems.The design of battery like monolithic design, modular design, heat management system design etc., all has material impact for battery temperature.The lithium ion battery temperature survey is the important means of research lithium ion battery Temperature Distribution and variation, can the boosting battery monolithic design, the design of modular design and heat management system.
Because the inside lithium ion cell central temperature is not easy to measure; Mostly before this is when experiment, to record the surface temperature of different time battery when discharge; By the anti-battery central temperature of obtaining of three-dimensional unstable state heat conduction problem, the central temperature of this release can not accurate response goes out the situation of inside lithium ion cell central temperature.Traditional thermocouple temperature measurement mode because exist measuring accuracy low, measure shortcomings such as unstable, that live line measurement is dangerous and the measuring sonde volume is big, the inside real time temperature of measurement lithium ion battery that can not effective and safe.
Summary of the invention
The objective of the invention is to design a kind of measurement mechanism and measuring method of inside lithium ion cell temperature, specifically provide a kind of method and fluorescence optical fiber temperature measuring equipment based on the fluorescence lifetime detected temperatures.
The present invention will solve be existing measurement mechanism with measuring method can not effective and safe the inside real time temperature of measurement lithium ion battery, and the result of measurement can not accurate response goes out the problem of inside lithium ion cell central temperature.
The material behavior of rare-earth fluorescent material of being based on temperature-measurement principle of the present invention realizes, after some rare-earth fluorescent material receives the ultraviolet ray irradiation and excites, in visible spectrum, launches line-spectra, i.e. fluorescence and twilight sunset thereof (twilight sunset is excitation luminous after stopping).The fall time constant of phosphorescence afterglow is the single-valued function of temperature, and typical temperature is high more, and time constant is more little.As long as record the value of time constant, just can obtain temperature.Use the great advantage of this method thermometric; It is exactly the time constant that dut temperature only depends on fluorescent material; And it is irrelevant with its dependent variable of system; For example variation of the variation of the intensity of light source, transfer efficiency, degree of coupling etc. does not influence measurement result, than having a clear superiority on light intensity thermometry and the Wavelength demodulation method principle.
The measurement mechanism of inside lithium ion cell temperature of the present invention; Comprise casing; It is characterized in that being provided with in the casing fluorescence excitation light source, light source driving circuit, light path coupled system, fluorescence signal is surveyed and disposal system, and casing is provided with fluorescence optical fiber temperature probe and display system.
Described light source driving circuit is used for producing the periodicity electric pulse and comes the driving LED light source, makes it produce corresponding driving pulse light wave, and this light source driving circuit is by Single-chip Controlling.
Described light path coupled system comprises filter plate, coupled lens and structural member, and filter plate and coupled lens are fixed on the structural member, and construct is in casing, with the accurate location of realizing that the light path coupling requires.
Described fluorescence optical fiber temperature probe adopts the corrosion-resistant fluorescence optical fiber of fine core diameter.
The advantage of measurement mechanism of the present invention:
1) measurement range of the present invention is big, can realize the measurement of temperature-50～350 ℃ temperature range, and measuring accuracy is high, can realize precision be higher than ± 0.5 ℃;
2) the structural design advantages of simple of the temperature probe used of measurement mechanism of the present invention, low cost of manufacture;
3) temperature probe size of the present invention is little, and pliability is good, and is high temperature resistant; Can realize probe diameter 0.1mm, the bending radius minimum is below 5mm, and different temperature probes and unlike signal detection module all can exchange; Do not need to proofread and correct after temperature probe and the signal detection module replacement, temperature probe does not have metal material, has electrical insulating property completely; Do not receive the influence of high pressure, strong-electromagnetic field, resist chemical and pollution-free;
Under the thermal cycle that repeats, the material and the structure of temperature probe are highly stable, and the performance of temperature probe is insensitive to the variation of light signal, long service life.
The present invention to the measuring method of inside lithium ion cell temperature is:
When making lithium ion battery, many fluorescence optical fiber temperature probes are imbedded inside battery according to certain distributed.
When lithium ion battery encapsulates, the other end of many fluorescence optical fiber temperature probes is cut off, keep concordant with the battery packaging structure outside surface; Exposed battery one end of many fluorescence optical fiber temperature probes is carried out suitable grinding and polishing to be handled.
Arranged distribution according to a plurality of fluorescence optical fiber temperature probes; Make a corresponding fully multifiber probe apparatus; This multifiber probe apparatus one end is fixed in the existing anchor clamps; The fiber end face grinding and polishing is handled, and the multifiber probe other end all carries out grinding and polishing to be handled, and is connected respectively to inside lithium ion cell temperature multimetering device interface end.
During thermometric; Many nuditing fibers in the multifiber probe apparatus are aimed at the exposed multifiber of lithium ion battery surface; Can record the fluorescence signal of the temperature probe reflection of imbedding inside lithium ion cell in each road; Through signal demodulation process device, read the temperature of every drive test temperature probe induction.
The advantage of measuring method of the present invention is:
Can carry out in real time the inside lithium ion cell temperature, high precision, multiple spot survey, and can directly obtain the distributed in three dimensions in inside lithium ion cell temperature field, thereby the more scientific and effective three-dimensional model of setting up the inside lithium ion cell temperature field.
Description of drawings
The optical fibre temperature survey apparatus that the fluorescence lifetime that is based on Fig. 1 detects is formed synoptic diagram.
Fig. 2 is a fluorescence optical fiber temperature probe synoptic diagram.
Fig. 3 is that inside lithium ion cell temperature spot measurement device is formed synoptic diagram.
Fig. 4 is that inside lithium ion cell temperature three point measurement devices are formed synoptic diagram.
Fig. 5 is that inside lithium ion cell temperature six point measurement devices are formed synoptic diagram.
Fig. 6 is that inside lithium ion cell temperature multiple spot three-dimensional measuring apparatus is formed synoptic diagram.
Above-mentioned drawing reference numeral is explained as follows:
The 1-fibre-optical probe, 2-optical fiber, 3,4,9-focuses on coupled lens, 5-LED, 6-temperature value display (being the display part); 7-electronic circuit part, the 8-fluorescence signal is surveyed and disposal system, 10-filter plate, 11-casing, 12-coat; The 13-covering, 14-fluorescent material, 15-anti-corrosion protection layer, 16-fibre core, 17-copper sleeve; The 18-O-ring seal, 19-structural member, 20-switch, 21-lithium battery.
Embodiment:
Below in conjunction with accompanying drawing the present invention is further specified.
Like Fig. 1, Fig. 2 and shown in Figure 3; The measurement mechanism of a kind of lithium ion battery 22 internal temperatures of the present invention; Comprise casing 11; Be provided with fluorescence excitation light source 5, light source driving circuit 7, light path coupled system in its casing 11, fluorescence signal is surveyed and disposal system, and casing is provided with fluorescence optical fiber temperature probe 1 and display system.
It is the light emitting diode (LED) of 470nm that described fluorescence excitation light source 5 adopts wavelength.
Described light source driving circuit 7 is used for producing the periodicity electric pulse and comes the driving LED light source, makes it produce corresponding driving pulse light wave, and this light source driving circuit 7 is by Single-chip Controlling.
Described light path coupled system comprises filter plate 10, three coupled lens; Be respectively coupled lens 3, coupled lens 4, coupled lens 9 and structural member 19, the light reflection of 10 pairs of 470nm wavelength of filter plate is near the transmittance of the wavelength 510nm; Coupled lens adopts at least a in non-spherical lens, globe lens, GRIN Lens, the plastic lens; Filter plate 20 is fixed on the structural member 19 with coupled lens, and structural member 19 is fixed in the casing, with the accurate location of realizing that the light path coupling requires.
Described fluorescence optical fiber temperature probe 1 adopts the corrosion-resistant fluorescence optical fiber of fine core diameter, this fibre-optical probe part doping fluorescent material 14, and outer fiber is coated with the metal material of anti-hydrofluorite corrosion, like nickel or copper.
The optical fiber external diameter can be carefully to 0.1mm.
Described display system comprises LCDs 20 or photodiode display screen or other digitron display screen, display process circuit, shows probe temperature in real time.LCDs 20 is connected with the display process circuit.
The present invention to the measuring method of inside lithium ion cell temperature is:
When making lithium ion battery 22, many fluorescence optical fiber temperature probes 1 are imbedded inside battery according to certain distributed.
When lithium ion battery encapsulates, the other end of many fluorescence optical fiber temperature probes is cut off, keep concordant with the battery packaging structure outside surface; Exposed battery one end of many fluorescence optical fiber temperature probes is carried out suitable grinding and polishing to be handled.
Arranged distribution according to a plurality of fluorescence optical fiber temperature probes; Make a corresponding fully multifiber probe apparatus; This multifiber probe apparatus one end is fixed in the existing anchor clamps; The fiber end face grinding and polishing is handled, and the multifiber probe other end all carries out grinding and polishing to be handled, and is connected respectively to the interface end of inside lithium ion cell temperature multimetering device.
During thermometric; Many nuditing fibers in the multifiber probe apparatus are aimed at the exposed multifiber of lithium ion battery surface; Can record the fluorescence signal of the temperature probe reflection of imbedding inside lithium ion cell in each road; Through signal demodulation process device, read the temperature of every drive test temperature probe induction.
As shown in Figure 2, the sensing probe of this measurement mechanism has the effect of anti-electrolytic solution corrosion.Fibre-optical probe encapsulates it with the metallic copper kapillary after fluorescent material is applied to optic fibre end during measurement.Adopt such processing mode can avoid the corrosion of electrolytic solution, make that total system is reliable and stable optical fiber and fluorescent material;
The present invention can carry out the measurement of spot measurement or 3 points or or multiple spot to the inside lithium ion cell temperature at 6.
Inside lithium ion cell temperature spot measurement device is as shown in Figure 3.Earlier imbed lithium ion battery 22 inside to fibre-optical probe 1 according to the measurement needs before measuring, battery 22 surfaces and copper sleeve 17 are through O-ring seal 18 sealings.Fibre-optical probe 1 detects variation of temperature and reaches via optical fiber 12 that temperature sensor is handled and shown in real time by display system.
Triple channel of the present invention, six passages and hyperchannel lithium battery interior temperature measuring equipment are specifically referring to Fig. 4, Fig. 5 and Fig. 6.
Probe size of the present invention is small, measuring accuracy is high, measurement range is big, response speed is fast, and good stability is anticorrosive, anti-electromagnetic interference capability is strong, has solved other measuring method well and when measuring, has introduced problems such as error, sensitivity and poor stability.
The present invention can carry out the measurement of spot measurement or 3 points or or multiple spot to lithium ion battery 11 internal temperatures at 6.
Claims (4)
1. the measurement mechanism of an inside lithium ion cell temperature; Comprise casing; It is characterized in that being provided with in the casing fluorescence excitation light source, light source driving circuit, light path coupled system, fluorescence signal is surveyed and disposal system, and casing is provided with fluorescence optical fiber temperature probe and display system;
Described light source driving circuit is used for producing the periodicity electric pulse and comes the driving LED light source, makes it produce corresponding driving pulse light wave, and this light source driving circuit is by Single-chip Controlling;
Described light path coupled system comprises filter plate, coupled lens and structural member, and filter plate and coupled lens are fixed on the structural member, and construct is in casing, with the accurate location of realizing that the light path coupling requires;
Described fluorescence optical fiber temperature probe adopts the corrosion-resistant fluorescence optical fiber of fine core diameter;
It is the LED of 470nm that described fluorescence excitation light source adopts wavelength.
Filter plate is to the reflection of the light of 470nm wavelength, and near the transmittance of the wavelength 510nm, coupled lens adopts at least a in non-spherical lens, globe lens, GRIN Lens, the plastic lens.
2. the measurement mechanism of a kind of inside lithium ion cell temperature according to claim 1 is characterized in that, this fibre-optical probe part doping fluorescent material, and outer fiber is coated with the metal material of anti-hydrofluorite corrosion; The optical fiber external diameter can be carefully to 0.1mm.
3. the measurement mechanism of a kind of inside lithium ion cell temperature according to claim 1; It is characterized in that described display system comprises LCDs or photodiode display screen or other digitron display screen, display process circuit; Show probe temperature in real time, LCDs is connected with the display process circuit.
4. the measuring method of an inside lithium ion cell temperature is characterized in that this measuring method comprises the steps: at least
When making lithium ion battery, many fluorescence optical fiber temperature probes are imbedded inside battery according to certain distributed;
When lithium ion battery encapsulates, the other end of many fluorescence optical fiber temperature probes is cut off, keep concordant with the battery packaging structure outside surface; Exposed battery one end of many fluorescence optical fiber temperature probes is carried out suitable grinding and polishing to be handled;
Arranged distribution according to a plurality of fluorescence optical fiber temperature probes; Make a corresponding fully multifiber probe apparatus; This multifiber probe apparatus one end is fixed in the existing anchor clamps; The fiber end face grinding and polishing is handled, and the multifiber probe other end all carries out grinding and polishing to be handled, and is connected respectively to inside lithium ion cell temperature multimetering device interface end;
During thermometric; Many nuditing fibers in the multifiber probe apparatus are aimed at the exposed multifiber of lithium ion battery surface; Can record the fluorescence signal of the temperature probe reflection of imbedding inside lithium ion cell in each road; Through signal demodulation process device, read the temperature of every drive test temperature probe induction.
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| CN201010530433A CN102052976B (en) | 2010-11-04 | 2010-11-04 | Device and method for measuring internal temperature of lithium ion battery |
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| CN201010530433A CN102052976B (en) | 2010-11-04 | 2010-11-04 | Device and method for measuring internal temperature of lithium ion battery |
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Families Citing this family (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102435347B (en) * | 2011-11-15 | 2013-07-03 | 清华大学 | Method for real-time measurement of multipoint temperatures based on fluorescence optical fiber temperature sensor |
| CN102694214A (en) * | 2012-05-22 | 2012-09-26 | 奇瑞汽车股份有限公司 | Measuring method for temperature of lithium-ion battery |
| CN103900733B (en) * | 2014-03-04 | 2016-08-17 | 清华大学 | The measuring method of internal temperature of battery field distribution |
| CN104900932A (en) * | 2015-04-23 | 2015-09-09 | 四川长虹电源有限责任公司 | Novel lithium-ion storage battery |
| CN104880261B (en) * | 2015-06-05 | 2018-04-10 | 淄博火炬能源有限责任公司 | Square laminated plates formula internal temperature of lithium ion battery detection method |
| CN105509926B (en) * | 2016-01-29 | 2018-06-08 | 珠海欧森斯科技有限公司 | Light path coupling device and fluorescence temperature sensing optical system |
| CN106802395A (en) * | 2017-02-21 | 2017-06-06 | 山东玉皇新能源科技有限公司 | A kind of inside lithium ion cell battery heat test device |
| CN108565496A (en) * | 2018-03-22 | 2018-09-21 | 天津市捷威动力工业有限公司 | A kind of method and battery preparation method of advance judgement lithium ion power battery electrolyte distribution |
| CN110690505A (en) * | 2019-09-06 | 2020-01-14 | 中国科学院上海光学精密机械研究所 | Embedding method of sensing optical fiber of lithium battery |
| CN110514321A (en) * | 2019-09-24 | 2019-11-29 | 上海集迦电子科技有限公司 | A kind of surface-adhered type fluorescence optical fiber temp probe |
| CN110609235A (en) * | 2019-10-14 | 2019-12-24 | 中国民用航空飞行学院 | Lithium battery thermal safety monitoring system based on optical fiber detection technology |
| CN113346199B (en) * | 2021-04-13 | 2022-10-04 | 华中科技大学 | Integrated optical fiber tab, preparation method and application |
| CN113125039B (en) * | 2021-04-25 | 2023-10-31 | 哈尔滨古宝科技有限公司 | Method for testing internal temperature of battery based on up-conversion fluorescent nano material |
| CN113484770B (en) * | 2021-06-10 | 2022-04-01 | 广东恒翼能科技有限公司 | Method and system for measuring and calculating core temperature inside battery on line based on charge and discharge data |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| DE102008057710A1 (en) * | 2008-11-17 | 2010-05-27 | Li-Tec Battery Gmbh | According to galvanic principles operating electrical device, such as a lithium-ion battery, with a temperature sensor |
| US8092081B2 (en) * | 2009-05-28 | 2012-01-10 | Tesla Motors, Inc. | Battery thermal event detection system using an optical fiber |
| CN202255682U (en) * | 2010-11-04 | 2012-05-30 | 中国科学院嘉兴无线传感网工程中心 | Measuring device for internal temperature of lithium ion battery |
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