CN110221212A - A kind of on-line dynamic measurement method of internal temperature of lithium ion battery - Google Patents
A kind of on-line dynamic measurement method of internal temperature of lithium ion battery Download PDFInfo
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- CN110221212A CN110221212A CN201910264219.5A CN201910264219A CN110221212A CN 110221212 A CN110221212 A CN 110221212A CN 201910264219 A CN201910264219 A CN 201910264219A CN 110221212 A CN110221212 A CN 110221212A
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- ion battery
- lithium ion
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- impedance phase
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K13/00—Thermometers specially adapted for specific purposes
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/378—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC] specially adapted for the type of battery or accumulator
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/389—Measuring internal impedance, internal conductance or related variables
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Abstract
The invention discloses a kind of on-line dynamic measurement methods of internal temperature of lithium ion battery, including impedance phase angle detecting device of the installation for detecting current lithium ion battery environment temperature temperature sensor and for detecting lithium ion battery impedance phase angle on the lithium ion battery in new-energy automobile；The relaxation time of new-energy automobile is detected, and measures the motional impedance phase angle of lithium ion battery in the relaxation time by impedance phase angle detecting device；The static impedance phase angle of lithium ion battery at this time is calculated by motional impedance phase angle；It tables look-up and obtains the static temperature of lithium ion battery corresponding with static impedance phase angle；The dynamic temperature of lithium ion battery at this time is calculated by the static temperature of lithium ion battery；Advantage is precisely can quickly to calculate the internal temperature of lithium ion battery by measuring the motional impedance phase angle of new-energy automobile, realizes the on-line dynamic measurement of lithium ion battery.
Description
Technical field
The present invention relates to lithium ion battery temperature detection field more particularly to a kind of dynamics of internal temperature of lithium ion battery
On-line Measuring Method.
Background technique
With the development and the passage of time of society, non-renewable energy resources are gradually decreased on the earth, and each state is all promoting
Sustainable energy Development Technology.Automobile industry is equally being greatly developed using the sustainable new energy of green as main energy sources,
The whole world is promoted the use of under the overall situation of new-energy automobile, and new-energy automobile will replace traditional fuel-engined vehicle in future.Existing rank
The new energy that section various countries mainly promote the use of is mainly electric energy, and power storage is among the power battery of new-energy automobile, therefore
The safety of power battery, reliability become very important key factor.Lithium-ion-power cell has energy density height,
The advantages that without charge and discharge memory effect, is increasingly becoming the mainstream vehicle mounted dynamic battery approved by market, has in new-energy automobile field
Be widely applied.At the same time, due to the complexity of vehicle driving-cycle, certain probability will cause electricity in the process of moving
Since physical impacts are as punctured, internal short-circuit of battery caused by squeezing, internal temperature is ramping up, finally causes to burn on fire in pond
Security risk.Therefore it is anticipation to the accurate estimation of internal temperature of lithium ion battery, prevents the pass of lithium ion battery thermal runaway
Key factor.
New-energy automobile is managed the use of power battery by being equipped with battery management system, battery management system meeting
The temperature signal detected is detected, if battery temperature is excessively high, can send to electric machine controller reduces output power
Signal, while the external exchange capacity of lithium ion battery is reinforced by the heat management system in new-energy automobile, if battery temperature is surveyed
Amount inaccuracy, it may appear that influence the diagnosis of battery management system, also continue heating once battery temperature occur and reaching critical point
Situation then can cause lithium ion battery out of control, lead to serious safety accident.Therefore to the accurate of internal temperature of lithium ion battery
Detection becomes one of an important factor for measurement is energy automobile safety, reliability.
Summary of the invention
The technical problems to be solved by the present invention are: providing a kind of on-line measurement and measurement that can be achieved to lithium ion battery
The on-line dynamic measurement method of accurate internal temperature of lithium ion battery.
The technical scheme of the invention to solve the technical problem is: a kind of dynamic of internal temperature of lithium ion battery
On-line Measuring Method, comprising the following steps:
Installation is for detecting current lithium ion battery environment temperature in step 1, the lithium ion battery in new-energy automobile
TAMTemperature sensor and impedance phase angle detecting device for detecting lithium ion battery impedance phase angle；
Step 2, the relaxation time t for detecting new-energy automobilere, and the relaxation time is measured by impedance phase angle detecting device
The motional impedance phase angle of interior lithium ion battery
Step 3, the static impedance phase angle that lithium ion battery at this time is calculated by motional impedance phase angle
Step 4, tabling look-up obtains the static temperature of lithium ion battery corresponding with static impedance phase angle in step 3
Tstatic；
Step 5, the dynamic temperature that lithium ion battery at this time is calculated by the static temperature of the lithium ion battery in step 4
Tmult。
Preferably, in the step 3By equation:
It is calculated,
Wherein a=0.065, τ=85, e are natural constant.
Preferably, the table in the step 4 is that the static impedance phase angle-in new energy car battery management system is quiet
State thermometer.
Preferably, the T in the step 5multBy equation
Tmult=β0+β1×Tstatic+β2×TAMIt is calculated,
Wherein β0=1.9235, β1=0.7408, β2=0.1829
Preferably, the relaxation time treFor the braking time of new-energy automobile, the time is by new-energy automobile
Auto Electronic Controlled System detects and passes to battery management system.
Compared with prior art, it is an advantage of the invention that calculating lithium by the motional impedance phase angle of measurement new-energy automobile
The internal temperature of ion battery, it can be achieved that lithium ion battery on-line dynamic measurement, can fast and accurately calculate lithium ion
The internal temperature of lithium ion battery of the battery in new-energy automobile braking time section.Accurately measure the inside of lithium ion battery
Temperature keeps battery management system relatively reliable to state estimation, the charge and discharge control function of power battery, enhances new energy vapour
The safety and reliability of vehicle.
Detailed description of the invention
Fig. 1 is the corresponding diagram under lithium ion battery difference static temperature of the present invention with static impedance phase angle；
Fig. 2 is that lithium ion battery environment temperature of the present invention is 20 degree, under the different relaxation times, impedance phase angle detecting device
Frequency and lithium ion battery motional impedance phase angle relationship figure；
Fig. 3 is that lithium ion battery environment temperature of the present invention is 10 degree, under the different relaxation times, impedance phase angle detecting device
Frequency and lithium ion battery motional impedance phase angle relationship figure；
Fig. 4 is that lithium ion battery environment temperature of the present invention is 5 degree, under the different relaxation times, impedance phase angle detecting device
Frequency and lithium ion battery motional impedance phase angle relationship figure；
Fig. 5 is that lithium ion battery environment temperature of the present invention is 20 degree, when the frequency of impedance phase angle detecting device is 10Hz,
Relaxation time and static impedance phase angle relationship figure；
Fig. 6 is that lithium ion battery environment temperature of the present invention is 10 degree, when the frequency of impedance phase angle detecting device is 10Hz,
Relaxation time and static impedance phase angle relationship figure；
Fig. 7 is that lithium ion battery environment temperature of the present invention is 5 degree, when the frequency of impedance phase angle detecting device is 10Hz,
Relaxation time and static impedance phase angle relationship figure.
Specific embodiment
The present invention will be described in further detail below with reference to the embodiments of the drawings.
Measure static impedance phase angle-thermometer of the lithium ion battery in static state first, measurement method be lithium from
Mounting temperature sensor on sub- battery, for detecting the static temperature of each single battery in display lithium ion battery；By lithium
Ion battery is placed in the isoperibol cabin that initial temperature is -20 DEG C；By 3 hours standings, when each of lithium ion battery
When the static temperature of single battery is identical as initial temperature, electrochemical impedance spectral technology is used to each single battery, that is, is treated
Survey lithium ion battery apply current value be 2 amperes, the exciting current that frequency is 10 hertz, and detected by electrochemical workstation
The static impedance phase angle of each single battery under Current Temperatures, and record；Then initial temperature is promoted 1 degree, repeated quiet
It sets 3 hours, when the static temperature of each single battery of lithium ion battery is identical as initial temperature, obtains each single battery
Corresponding static impedance phase angle, when temperature is higher than 40 degree, static impedance phase angle is as there is no bright for the change of temperature
Aobvious variation, therefore repeat the above steps until initial temperature rises to 40 degree, and obtained data are formed static impedance phase angle-
Static temperature table.Static impedance phase angle-static temperature table is input to the battery management system in new-energy automobile.By Fig. 1
Known to lithium ion battery static temperature and lithium ion battery static impedance phase angle at one-to-one relationship, when obtain lithium from
By tabling look-up it can be learnt that the static temperature of lithium ion battery at this time behind the static impedance phase angle of sub- battery.
It can be obtained new-energy automobile by following steps after obtaining static impedance phase angle-static temperature table stopping
The dynamic temperature of lithium ion battery in the vehicle period: installation is for detecting in step 1, the lithium ion battery in new-energy automobile
Current lithium ion battery environment temperature TAMTemperature sensor and impedance phase for detecting lithium ion battery impedance phase angle
Parallactic angle detection device, the course of work of impedance phase angle detecting device are to obtain electricity by electric-vehicle-mounted charger abbreviation OBC
Alternating current can and be converted electrical energy into, alternating current is stopped in new-energy automobile brake i.e. lithium ion battery to motor mistake
Cheng Zhongxiang lithium ion battery applies the alternating current that frequency is l0Hz and measures lithium-ion electric at this time by electrochemical impedance spectral technology
The motional impedance phase angle in pond；Lithium ion battery environment temperature is detected by battery management system and is obtained.
Step 2, the braking time t that detection new-energy automobile is detected by Auto Electronic Controlled Systemre, and pass through impedance phase
Angle detecting device measures the motional impedance phase angle of lithium ion battery in braking time
Step 3 passes through the controller operation in battery management systemAnd it counts
Calculate the static impedance phase angle of lithium ion battery at this time
Step 4, the static impedance phase angle that will be obtained in step 3 by battery management systemWith static impedance phase
Parallactic angle-static temperature table compares and obtains the static temperature of lithium ion battery corresponding with the static impedance phase angle at this time
Tstatic；
Step 5 according to the lithium ion battery static temperature obtained in step 4 and passes through the controller in battery management system
Operation Tmult=1.9235+0.7408 × Tstatic+0.1829×TAM, to obtain the dynamic temperature of lithium ion battery at this time
Tmult。
Further, as shown in Fig. 2-Fig. 4, in new-energy automobile brake process, pass through impedance phase angle detecting device
Impedance phase angle detecting device work known to the impedance phase angle of acquisition is in 10HZ frequency, when lithium ion battery environment temperature is 20
Degree, 10 degree, 5 degree, motional impedance phase angle are corresponding with brake duration dullness；It can further be learnt by Fig. 5-Fig. 7, impedance phase angle
Detection device work under 10HZ frequency, when lithium ion battery environment temperature be 20 degree when, with the relaxation time increase lithium from
The static impedance phase angle of sub- battery is exponentially related to the relaxation time；When lithium ion battery environment temperature is 10 degree, with relaxation
The static impedance phase angle of the increase lithium ion battery of Henan time is exponentially related to the relaxation time；When lithium-ion electric pool environment temperature
When degree is 5, as the static impedance phase angle of the increase lithium ion battery in relaxation time is exponentially related to the relaxation time.
It therefore can be accurate with the relaxation time by calculating the motional impedance phase angle of the lithium ion battery in the relaxation time
The dynamic temperature of lithium ion battery in the time is measured, i.e. the internal temperature of lithium ion battery at this time.
The foregoing is only a preferred embodiment of the present invention, but scope of protection of the present invention is not limited thereto,
Anyone skilled in the art in the technical scope disclosed by the present invention, according to the technique and scheme of the present invention and its
Inventive concept is subject to equivalent substitution or change, should be covered by the protection scope of the present invention.
Claims (5)
1. a kind of on-line dynamic measurement method of internal temperature of lithium ion battery, it is characterised in that the following steps are included:
Installation is for detecting current lithium ion battery environment temperature T in step 1, the lithium ion battery in new-energy automobileAM's
Temperature sensor and impedance phase angle detecting device for detecting lithium ion battery impedance phase angle；
Step 2, the relaxation time t for detecting new-energy automobilere, and lithium in the relaxation time is measured by impedance phase angle detecting device
The motional impedance phase angle of ion battery
Step 3, the static impedance phase angle that lithium ion battery at this time is calculated by motional impedance phase angle
Step 4, tabling look-up obtains the static temperature T of lithium ion battery corresponding with static impedance phase angle in step 3static；
Step 5, the dynamic temperature T that lithium ion battery at this time is calculated by the static temperature of the lithium ion battery in step 4mult。
2. a kind of on-line dynamic measurement method of internal temperature of lithium ion battery as described in claim 1, which is characterized in that institute
In the step 3 statedBy equation
It is calculated,
Wherein a=0.065, τ=85, e are natural constant.
3. a kind of on-line dynamic measurement method of internal temperature of lithium ion battery as described in claim 1, which is characterized in that institute
Table in the step 4 stated is static impedance phase angle-static temperature table in new energy car battery management system.
4. a kind of on-line dynamic measurement method of internal temperature of lithium ion battery as described in claim 1, which is characterized in that institute
T in the step 5 statedmultBy equation
Tmult=β0+β1×Tstatic+β2×TAMIt is calculated,
Wherein β0=1.9235, β1=0.7408, β2=0.1829.
5. a kind of on-line dynamic measurement method of internal temperature of lithium ion battery as described in claim 1, which is characterized in that institute
The relaxation time t statedreFor the braking time of new-energy automobile, which is examined by the Auto Electronic Controlled System in new-energy automobile
It surveys and passes to battery management system.
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Cited By (4)
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| CN110703115A (en) * | 2019-10-30 | 2020-01-17 | 同济大学 | Online estimation method for average temperature of storage battery of electric vehicle |
| WO2020083035A1 (en) * | 2018-10-24 | 2020-04-30 | 宁波普瑞均胜汽车电子有限公司 | Method for detecting temperature of lithium ion battery based on impedance phase angle |
| CN111624503A (en) * | 2020-04-26 | 2020-09-04 | 宁波普瑞均胜汽车电子有限公司 | Lithium ion battery temperature online estimation method |
| CN113203957A (en) * | 2021-04-14 | 2021-08-03 | 郑州大学 | Lithium ion internal temperature prediction method based on dynamic impedance measurement |
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| CN113203957A (en) * | 2021-04-14 | 2021-08-03 | 郑州大学 | Lithium ion internal temperature prediction method based on dynamic impedance measurement |
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Application publication date: 20190910 |