CN103293483A - Lithium battery health condition estimation method based on internal resistance measurement - Google Patents
Lithium battery health condition estimation method based on internal resistance measurement Download PDFInfo
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- CN103293483A CN103293483A CN2013101974957A CN201310197495A CN103293483A CN 103293483 A CN103293483 A CN 103293483A CN 2013101974957 A CN2013101974957 A CN 2013101974957A CN 201310197495 A CN201310197495 A CN 201310197495A CN 103293483 A CN103293483 A CN 103293483A
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Abstract
The invention relates to a lithium battery health condition estimation method based on internal resistance measurement. The existing method can not meet requirements on online measurement and is poor in precision. The lithium battery health condition estimation method includes that internal resistance of brand new batteries and burn-in batteries is measured, then internal resistance of batteries to be measured is measured, and according to values of the internal resistance, estimation on lithium battery health condition can be acquired through a linear interpolation method. The lithium battery health condition estimation method based on internal resistance measurement can conveniently estimate the battery health condition in real time, calculation is fast, and estimation is accurate.
Description
Technical field
The invention belongs to the battery technology field, be specifically related to a kind of lithium battery health status method of estimation based on internal resistance measurement.
Background technology
Lithium battery has the voltage height, and energy density is big, and self-discharge rate hangs down the advantage with the long life, is widely used among many fields.The life-span of battery is by many factor affecting, as the working environment of battery and the charge-discharge characteristic of battery.If battery altering is too early, will cause enormous economic loss.On the contrary, if battery altering is late excessively, will have a strong impact on the reliability of system.For between system reliability and economic benefit, obtaining best half-way house, need in time, exactly the health status of electrolytic cell (State of Health is hereinafter to be referred as SOH).
SOH is defined as the ratio of the current max cap. of battery and battery nominal capacity.The SOH of battery can't directly record with certain sensor, and it must pass through the measurement to some other physical quantitys, and adopts certain mathematical model and algorithm to estimate to obtain.
Battery SOH method of estimation commonly used at present has direct electric discharge and electrochemical impedance method etc.Electric discharge still needs off-line measurement, and needs professional equipment accurately and reliably fully, and operation inconvenience is wasted time and energy, and generally only is applicable to the laboratory occasion.The electrochemical impedance method need be carried out lot of data collection, analysis, processing to similar battery, to obtain the SOH correlation properties of this type of battery, this method content is loaded down with trivial details, workload is big, and Measurement and analysis specific aim as a result is more intense, to different types of battery, need do experiment again, expense is big and of long duration.
Summary of the invention
Purpose of the present invention overcomes the deficiencies in the prior art exactly, proposes a kind of lithium battery health status method of estimation based on internal resistance measurement, estimates accurately, and can be implemented in the line estimation.
Battery health situation method of estimation of the present invention, concrete steps are:
Step (1) is measured the stable internal resistance R of brand-new battery
New, its concrete grammar is:
Step 1-1 is discharged to its cut-off voltage to brand-new battery with the steady current of 1C at normal temperatures fully;
Step 1-2 charges to its charge protection voltage with the steady current of 0.4C to this battery at normal temperatures fully, carries out constant-voltage charge to battery then and is full of; Battery was left standstill 1.5 hours, and the steady current with 1C is discharged to its cut-off voltage fully to battery again, and record t discharge time (unit be hour) calculates total discharge capacity Q at this moment
1=1C * t;
Step 1-3 repeats above-mentioned steps 1-2, until total discharge capacity Q of the k time
kTotal discharge capacity Q with the k-1 time
K-1Between absolute difference less than a certain tolerance limit Δ Q, total discharge capacity of note this moment is the total volume Q of brand-new battery, i.e. Q=Q
k
Battery after step 1-4 handles above-mentioned the k time carries out the complete charging process among the step 1-2, then battery is left standstill 1.5 hours after, with the steady current of 1C battery is carried out the discharge that duration is 0.4Q/1C, this moment battery the SOC(state-of-charge) be 60%;
The internal resistance that step 1-5 measures battery among the above-mentioned steps 1-4 with AC impedence method is R
New
Step (2) is measured the stable internal resistance R of aging fully battery
Old, its concrete grammar is:
Battery in the above-mentioned steps of step 2-1 (1) is proceeded the cycle charge-discharge burin-in process: at first, the steady current with 0.4C charges to its charge protection voltage fully to this battery at normal temperatures, carries out constant-voltage charge to battery then and is full of; Battery was left standstill more than 1.5 hours, and the steady current with 1C is discharged to its cut-off voltage fully to battery again, records total discharge capacity; Above-mentioned charge and discharge process alternate cycles N time only is left 80% of brand-new battery total capacity, i.e. Q until total discharge capacity of battery
N=0.8Q, think that this battery is aging fully this moment;
Step 2-2 carries out complete charging process among the step 2-1 to above-mentioned aging fully battery, then battery is left standstill 1.5 hours after, with the steady current of 1C battery is carried out the discharge that duration is 0.32Q/1C, reaching SOC is 60%;
The internal resistance that step 2-3 measures battery among the above-mentioned steps 2-2 with AC impedence method is R
Old
R in above-mentioned steps (1), (2)
NewAnd R
OldOnly need carry out once follow-up will directly the use as known quantity to battery of the same type.
Step (3) is carried out its SOH(health status to battery of the same type) estimation, concrete grammar is:
Step 3-1 adopts AC impedence method to measure the internal resistance R of battery;
Step 3-2 calculates the SOH of this battery:
The present invention can carry out the estimation of battery SOH easily, but has the real-time online estimation, and estimates advantage accurately and reliably.
Embodiment
Based on the lithium battery health status method of estimation of internal resistance measurement, concrete steps are:
Step (1) is measured the stable internal resistance R of brand-new battery
New, its concrete grammar is:
Step 1-1 is discharged to its cut-off voltage to brand-new battery with the steady current of 1C at normal temperatures fully;
Step 1-2 charges to its charge protection voltage with the steady current of 0.4C to this battery at normal temperatures fully, carries out constant-voltage charge to battery then and is full of; Battery was left standstill 1.5 hours, and the steady current with 1C is discharged to its cut-off voltage fully to battery again, and record t discharge time (unit be hour) calculates total discharge capacity Q at this moment
1=1C * t;
Step 1-3 repeats above-mentioned steps 1-2, until total discharge capacity Q of the k time
kTotal discharge capacity Q with the k-1 time
K-1Between absolute difference less than a certain tolerance limit Δ Q, total discharge capacity of note this moment is the total volume Q of brand-new battery, i.e. Q=Q
k
Battery after step 1-4 handles above-mentioned the k time carries out the complete charging process among the step 1-2, then battery is left standstill 1.5 hours after, with the steady current of 1C battery is carried out the discharge that duration is 0.4Q/1C, this moment battery the SOC(state-of-charge) be 60%;
The internal resistance that step 1-5 measures battery among the above-mentioned steps 1-4 with AC impedence method is R
New
Step (2) is measured the stable internal resistance R of aging fully battery
Old, its concrete grammar is:
Battery in the above-mentioned steps 1 of step 2-1 is proceeded the cycle charge-discharge burin-in process: at first, the steady current with 0.4C charges to its charge protection voltage fully to this battery at normal temperatures, carries out constant-voltage charge to battery then and is full of; Battery was left standstill more than 1.5 hours, and the steady current with 1C is discharged to its cut-off voltage fully to battery again, records total discharge capacity; Above-mentioned charge and discharge process alternate cycles N time only is left 80% of brand-new battery total capacity, i.e. Q until total discharge capacity of battery
N=0.8Q, think that this battery is aging fully this moment;
Step 2-2 carries out complete charging process among the step 2-1 to above-mentioned aging fully battery, then battery is left standstill 1.5 hours after, with the steady current of 1C battery is carried out the discharge that duration is 0.32Q/1C, reaching SOC is 60%;
The internal resistance that step 2-3 measures battery among the above-mentioned steps 2-2 with AC impedence method is R
Old
R in the above-mentioned steps 1,2
NewAnd R
OldOnly need carry out once follow-up will directly the use as known quantity to battery of the same type.
Step (3) is carried out its SOH(health status to battery of the same type) estimation, concrete grammar is:
Step 3-1 adopts AC impedence method to measure the internal resistance R of battery;
Step 3-2 calculates the SOH of this battery:
In the above-mentioned steps 1,2,3, AC impedence method is measured the internal resistance of cell and is belonged to the known of this area, does not repeat them here.
Claims (1)
1. lithium battery health status method of estimation based on internal resistance measurement is characterized in that the concrete steps of this method are:
Step (1) is measured the stable internal resistance R of brand-new battery
New, its concrete grammar is:
Step 1-1 is discharged to its cut-off voltage to brand-new battery with the steady current of 1C at normal temperatures fully;
Step 1-2 charges to its charge protection voltage with the steady current of 0.4C to this battery at normal temperatures fully, carries out constant-voltage charge to battery then and is full of; Battery was left standstill 1.5 hours, and the steady current with 1C is discharged to its cut-off voltage fully to battery again, record t discharge time, and unit be hour to calculate total discharge capacity Q at this moment
1=1C * t;
Step 1-3 repeats above-mentioned steps 1-2, until total discharge capacity Q of the k time
kTotal discharge capacity Q with the k-1 time
K-1Between absolute difference less than a certain tolerance limit Δ Q, total discharge capacity of note this moment is the total volume Q of brand-new battery, i.e. Q=Q
k
Battery after step 1-4 handles above-mentioned the k time carries out the complete charging process among the step 1-2, then battery is left standstill 1.5 hours after, with the steady current of 1C battery is carried out the discharge that duration is 0.4Q/1C, this moment, the state-of-charge of battery was 60%;
The internal resistance that step 1-5 measures battery among the above-mentioned steps 1-4 with AC impedence method is R
New
Step (2) is measured the stable internal resistance R of aging fully battery
Old, its concrete grammar is:
Battery in the above-mentioned steps of step 2-1 (1) is proceeded the cycle charge-discharge burin-in process: at first, the steady current with 0.4C charges to its charge protection voltage fully to this battery at normal temperatures, carries out constant-voltage charge to battery then and is full of; Battery was left standstill more than 1.5 hours, and the steady current with 1C is discharged to its cut-off voltage fully to battery again, records total discharge capacity; Above-mentioned charge and discharge process alternate cycles N time only is left 80% of brand-new battery total capacity, i.e. Q until total discharge capacity of battery
N=0.8Q, think that this battery is aging fully this moment;
Step 2-2 carries out complete charging process among the step 2-1 to above-mentioned aging fully battery, then battery is left standstill 1.5 hours after, with the steady current of 1C battery is carried out the discharge that duration is 0.32Q/1C, reaching SOC is 60%;
The internal resistance that step 2-3 measures battery among the above-mentioned steps 2-2 with AC impedence method is R
Old
Step (3) is carried out the estimation of health status to battery of the same type, and concrete grammar is:
Step 3-1 adopts AC impedence method to measure the internal resistance R of battery;
Step 3-2 calculates the health status SOH of this battery:
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Cited By (12)
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| CN103698713A (en) * | 2013-12-30 | 2014-04-02 | 长城汽车股份有限公司 | Method for assessing SOH (state of health) of lithium ion battery |
| CN103995232A (en) * | 2014-04-21 | 2014-08-20 | 中通客车控股股份有限公司 | Lithium iron phosphate power battery pack peak value charge and discharge performance detection method |
| CN104198949A (en) * | 2014-09-09 | 2014-12-10 | 上虞安卡拖车配件有限公司 | Battery health state detection method |
| CN104698381A (en) * | 2013-12-04 | 2015-06-10 | 广州汽车集团股份有限公司 | Method for testing power characteristic and internal resistance of battery |
| CN104749530A (en) * | 2015-04-10 | 2015-07-01 | 普天新能源车辆技术有限公司 | Discharging self-dissipation capacity decay estimation method and device of power battery |
| CN105445663A (en) * | 2014-08-25 | 2016-03-30 | 国家电网公司 | Method and device for detecting aging degree of battery |
| CN104111377B (en) * | 2014-08-06 | 2017-02-15 | 先进储能材料国家工程研究中心有限责任公司 | Method for measuring DC (Direct Current) internal resistance of secondary battery in different charge states |
| CN106707029A (en) * | 2015-11-13 | 2017-05-24 | 北汽福田汽车股份有限公司 | Power cell internal resistance calculation method, and health degree determination method and device |
| CN109061511A (en) * | 2018-09-20 | 2018-12-21 | 苏州艾思控科技有限公司 | The method of battery cell SOH is calculated in a kind of battery management system in real time |
| CN109613446A (en) * | 2019-01-14 | 2019-04-12 | 中国计量大学 | A kind of aging of lithium battery detection method based on time series analysis |
| CN109856558A (en) * | 2019-02-18 | 2019-06-07 | 王国平 | A kind of storage battery health degree detection method and system |
| CN111175664A (en) * | 2018-11-09 | 2020-05-19 | 大众汽车有限公司 | Method for determining aging state of battery, controller and vehicle |
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Cited By (18)
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| CN104698381A (en) * | 2013-12-04 | 2015-06-10 | 广州汽车集团股份有限公司 | Method for testing power characteristic and internal resistance of battery |
| CN104698381B (en) * | 2013-12-04 | 2017-08-22 | 广州汽车集团股份有限公司 | It is a kind of to test cell performance characteristic and the method for internal resistance |
| CN103698713A (en) * | 2013-12-30 | 2014-04-02 | 长城汽车股份有限公司 | Method for assessing SOH (state of health) of lithium ion battery |
| CN103995232A (en) * | 2014-04-21 | 2014-08-20 | 中通客车控股股份有限公司 | Lithium iron phosphate power battery pack peak value charge and discharge performance detection method |
| CN103995232B (en) * | 2014-04-21 | 2017-01-04 | 中通客车控股股份有限公司 | A kind of detection method of lithium iron phosphate dynamic battery group peak value charge-discharge performance |
| CN104111377B (en) * | 2014-08-06 | 2017-02-15 | 先进储能材料国家工程研究中心有限责任公司 | Method for measuring DC (Direct Current) internal resistance of secondary battery in different charge states |
| CN105445663B (en) * | 2014-08-25 | 2018-04-03 | 国家电网公司 | The detection method and device of cell degradation degree |
| CN105445663A (en) * | 2014-08-25 | 2016-03-30 | 国家电网公司 | Method and device for detecting aging degree of battery |
| CN104198949A (en) * | 2014-09-09 | 2014-12-10 | 上虞安卡拖车配件有限公司 | Battery health state detection method |
| CN104749530A (en) * | 2015-04-10 | 2015-07-01 | 普天新能源车辆技术有限公司 | Discharging self-dissipation capacity decay estimation method and device of power battery |
| CN104749530B (en) * | 2015-04-10 | 2017-08-25 | 普天新能源车辆技术有限公司 | A kind of electrokinetic cell discharges from power consumption Performance Decay evaluation method and device |
| CN106707029A (en) * | 2015-11-13 | 2017-05-24 | 北汽福田汽车股份有限公司 | Power cell internal resistance calculation method, and health degree determination method and device |
| CN106707029B (en) * | 2015-11-13 | 2020-10-23 | 北京宝沃汽车股份有限公司 | Method for calculating internal resistance value of power battery and method and device for determining health degree |
| CN109061511A (en) * | 2018-09-20 | 2018-12-21 | 苏州艾思控科技有限公司 | The method of battery cell SOH is calculated in a kind of battery management system in real time |
| CN111175664A (en) * | 2018-11-09 | 2020-05-19 | 大众汽车有限公司 | Method for determining aging state of battery, controller and vehicle |
| CN109613446A (en) * | 2019-01-14 | 2019-04-12 | 中国计量大学 | A kind of aging of lithium battery detection method based on time series analysis |
| CN109613446B (en) * | 2019-01-14 | 2020-12-08 | 中国计量大学 | Lithium battery aging detection method based on time series analysis |
| CN109856558A (en) * | 2019-02-18 | 2019-06-07 | 王国平 | A kind of storage battery health degree detection method and system |
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Application publication date: 20130911 |