CN102052976A - Measuring device for internal temperature of lithium ion battery and measuring method - Google Patents
Measuring device for internal temperature of lithium ion battery and measuring method Download PDFInfo
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- CN102052976A CN102052976A CN201010530433XA CN201010530433A CN102052976A CN 102052976 A CN102052976 A CN 102052976A CN 201010530433X A CN201010530433X A CN 201010530433XA CN 201010530433 A CN201010530433 A CN 201010530433A CN 102052976 A CN102052976 A CN 102052976A
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Abstract
The invention discloses a measuring device for the internal temperature of a lithium ion battery. The measuring device comprises a fluorescent excitation light source, a light source drive circuit, a light path coupling system and a fluorescent signal detection and processing system which are arranged in a case body; and a fluorescent optical fiber temperature measuring probe and a display system are arranged in the case body. The invention further discloses a measuring method for the internal temperature of the lithium ion battery. The measuring method comprises the steps as follows: during the manufacture of the lithium ion battery, a plurality of fluorescent optical fiber temperature measuring probes in certain distribution are buried in the lithium ion battery; an exactly corresponding multiple optical fiber probe device is manufactured according to the arrangement and distribution of the plurality of fluorescent optical fiber temperature measuring probes, and is connected to the interface end of a multiple point measuring device for the internal temperature of the lithium ion battery respectively; during temperature measurement, as long as a plurality of naked optical fibers in the multiple optical fiber probe device are aligned with a plurality of naked optical fibers on the surface of the lithium ion battery, a fluorescent signal reflected by each fluorescent optical fiber temperature measuring probe buried in the lithium ion battery can detected, and the temperature sensed by each fluorescent optical fiber temperature measuring probe can be read out through a signal demodulation and 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 because operating voltage height, power density and energy density height, 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 lithium ion battery group in application 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, 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 as 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 to record the surface temperature of different time battery when discharge when experiment, 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 is the inside real time temperature of the measurement lithium ion battery that existing measurement mechanism and measuring method can not effective and safes, and the result who measures 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 is subjected to the ultraviolet ray irradiation and excites, launches line-spectra in visible spectrum, 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 structural member is fixed in the 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, the measuring accuracy height, 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, pliability is good, high temperature resistant, can realize probe diameter 0.1mm, the bending radius minimum is below 5mm, different temperature probes and unlike signal detection module all can exchange, do not need after temperature probe and signal detection module are replaced to proofread and correct, temperature probe does not have metal material, has electrical insulating property completely, be not subjected to 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 distribution.
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, 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, by 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 described 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; the 10-filter plate, 11-casing, 12-coat; the 13-covering, 14-fluorescent material, 15-anti-corrosion protection layer; the 16-fibre core, 17-copper sleeve, 18-O-ring seal; the 19-structural member, 20-switch, 21-lithium battery.
Embodiment:
Below in conjunction with accompanying drawing the present invention is further specified.
As 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, transmittance near the wavelength 510nm, coupled lens adopts at least a in non-spherical lens, globe lens, GRIN Lens, the plastic lens, filter plate 20 and coupled lens are fixed on the structural member 19, 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, as 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 distribution.
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, 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, by 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 as shown in Figure 3.Elder generation imbeds lithium ion battery 22 inside to fibre-optical probe 1 according to measuring needs before measuring, and battery 22 surfaces seal by O-ring seal 18 with copper sleeve 17.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 introduce problems such as error, sensitivity and poor stability when measuring.
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 (7)
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 structural member is fixed in the 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.
2. the measurement mechanism of a kind of inside lithium ion cell temperature according to claim 1 is characterized in that it is the LED of 470nm that described fluorescence excitation light source adopts wavelength.
3. the measurement mechanism of a kind of inside lithium ion cell temperature according to claim 1, it is characterized in that the light reflection of filter plate to the 470nm wavelength, to near the transmittance of the wavelength 510nm, coupled lens adopts at least a in non-spherical lens, globe lens, GRIN Lens, the plastic lens.
4. 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, as nickel or copper; The optical fiber external diameter can be carefully to 0.1mm.
5. the measurement mechanism of a kind of inside lithium ion cell temperature according to claim 1 is characterized in that the photodiode peak wavelength is 510nm.
6. 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.
7. 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 distribution;
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, 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, by signal demodulation process device, read the temperature of every drive test temperature probe induction.
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102435347A (en) * | 2011-11-15 | 2012-05-02 | 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 |
| CN103900733A (en) * | 2014-03-04 | 2014-07-02 | 清华大学 | Method for measuring temperature field distribution inside battery |
| CN104880261A (en) * | 2015-06-05 | 2015-09-02 | 淄博火炬能源有限责任公司 | Method for detecting internal temperature of square laminated lithium ion battery |
| 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 |
| CN105509926A (en) * | 2016-01-29 | 2016-04-20 | 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 |
| 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 |
| 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 |
| CN113125039A (en) * | 2021-04-25 | 2021-07-16 | 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 |
| CN113346199A (en) * | 2021-04-13 | 2021-09-03 | 华中科技大学 | Integrated optical fiber tab, preparation method and application |
| CN113484770A (en) * | 2021-06-10 | 2021-10-08 | 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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Patent Citations (3)
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| US20100124250A1 (en) * | 2008-11-17 | 2010-05-20 | Walter Lachenmeier | Electrical unit working in accordance with galvanic principles, for example a lithium-ion accumulator, having a temperature sensor |
| US20100135355A1 (en) * | 2009-05-28 | 2010-06-03 | Tesla Motors, Inc. | Battery thermal event detection system using an optical fiber |
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Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102435347A (en) * | 2011-11-15 | 2012-05-02 | 清华大学 | Method for real-time measurement of multipoint temperatures based on fluorescence optical fiber temperature sensor |
| 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 |
| CN103900733A (en) * | 2014-03-04 | 2014-07-02 | 清华大学 | Method for measuring temperature field distribution inside battery |
| 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 |
| CN104880261A (en) * | 2015-06-05 | 2015-09-02 | 淄博火炬能源有限责任公司 | Method for detecting internal temperature of square laminated lithium ion battery |
| 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 |
| CN105509926A (en) * | 2016-01-29 | 2016-04-20 | 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 |
| CN113346199A (en) * | 2021-04-13 | 2021-09-03 | 华中科技大学 | Integrated optical fiber tab, preparation method and application |
| CN113125039A (en) * | 2021-04-25 | 2021-07-16 | 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 |
| 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 |
| CN113484770A (en) * | 2021-06-10 | 2021-10-08 | 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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