CN106814318A - The method for determining the life-span of lithium ion battery and determining estimated life modifying factor - Google Patents
The method for determining the life-span of lithium ion battery and determining estimated life modifying factor Download PDFInfo
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- CN106814318A CN106814318A CN201510854650.7A CN201510854650A CN106814318A CN 106814318 A CN106814318 A CN 106814318A CN 201510854650 A CN201510854650 A CN 201510854650A CN 106814318 A CN106814318 A CN 106814318A
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- lithium ion
- ion battery
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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]
- G01R31/392—Determining battery ageing or deterioration, e.g. state of health
Abstract
Disclose a kind of method in the life-span for determining lithium ion battery.The method includes：Lithium ion battery is charged；At the first moment, the first SOC of the lithium ion battery is obtained；At the second moment, the second SOC of the lithium ion battery is obtained；Based on acquired the first SOC and the second SOC, determine that the state-of-charge of the lithium ion battery is interval；And the capacity being filled with to the lithium ion battery based on identified state-of-charge interval, the nominal capacity of the lithium ion battery and in charging process, determine the life-span of the lithium ion battery.Also disclose a kind of method of the modifying factor of the estimated life for determining lithium ion battery.
Description
Technical field
Present disclose relates generally to lithium ion battery management domain, more particularly, to determination lithium ion
The method of the modifying factor of the method in the life-span of battery and the estimated life of determination lithium ion battery.
Background technology
Lithium ion battery is widely used by its excellent performance in new-energy automobile field.
In the vehicle service life cycle of new-energy automobile, the life-span of lithium ion battery itself may be with work
The consumption of property material and decay.Along with the decay in lithium ion battery life-span, its charging and discharging capabilities, from
The numerical value such as body capacity and energy can also change.Therefore, by estimating lithium ion battery exactly
Life-span, can exactly assess the current ability of lithium ion battery.
The life-span of lithium ion battery may include calendar life and cycle life.A kind of existing estimation on line
The method in lithium ion battery life-span is：Correlation formula is obtained using the fitting of test experiment data, then
Bringing into software carries out the estimation in lithium ion battery life-span.However, due to being had differences between battery core,
Estimation precision obtained by being estimated the life-span of lithium ion battery using the method is not high.
The content of the invention
Therefore, it is necessary to provide a kind of method in the determination lithium ion battery life-span with higher precision.
The disclosure inventors realized that, the actual capacity of lithium ion battery is obtained by on-line amending
It is relatively difficult, and pass through to compare interval interior in identical state-of-charge (state of charge, SOC), when
The corresponding capacity of preceding lithium ion battery determines lithium with the capacity ratio corresponding to lithium ion battery when dispatching from the factory
The current age of ion battery is feasible.
Considered based on above-mentioned, according to an aspect of this disclosure, in one embodiment, there is provided one
The method for planting the life-span for determining lithium ion battery.The method includes：Lithium ion battery is filled
Electricity；At the first moment, the first SOC of the lithium ion battery is obtained；At the second moment, obtain
Take the second SOC of the lithium ion battery；Based on the first acquired SOC and second
SOC, determines that the state-of-charge of the lithium ion battery is interval；And based on identified charged
State interval, the nominal capacity of the lithium ion battery and the lithium ion battery is filled in charging process
The capacity for entering, determines the life-span of the lithium ion battery.
In one example, determining the life-span of lithium ion battery can be realized by below equation：
SOH=C/ (SOC2-SOC1)/CRate
Wherein, SOH represents the life-span of identified lithium ion battery, and C is represented and lithium ion battery is filled
The capacity for entering, SOC1 represents the first SOC, and SOC2 represents the second SOC,
(SOC2-SOC1) represent that state-of-charge is interval, CRateRepresent nominal capacity.
In one example, the first moment was charging initial time, obtained the first of the lithium ion battery
SOC includes：In the charging initial time, judge whether the lithium ion battery has stood predetermined
Duration；If the lithium ion battery has stood scheduled duration, the current open circuit based on the lithium ion battery
Voltage and according to the open-circuit voltage-state-of-charge curve of the lithium ion battery, determines the lithium ion battery
The first SOC.
In one example, the second moment was charging finishing time, obtained the second of the lithium ion battery
SOC includes：Judge whether the trickle charge phase is had been enter into the charging of the lithium ion battery；Such as
Charging of the fruit to the lithium ion battery has been enter into the trickle charge phase, obtains the lithium ion battery in the trickle
The voltage of charging phase；And in the charging finishing time, based on the lithium ion battery in the trickle charge
The voltage of phase and according to the open-circuit voltage-state-of-charge curve of the lithium ion battery, determines the lithium-ion electric
Second SOC in pond.
The lithium ion battery is included for example, ternary material lithium ion battery.
Compared to the method in estimation lithium ion battery life-span of the prior art, the presently disclosed embodiments
The middle method for determining the lithium ion battery life-span is obtained in that the life-span of more accurate lithium ion battery.
The disclosure inventors realized that, based on the lithium ion determined by the method for the various embodiments described above
Battery obtained by the life-span of battery and the method for passing through the existing estimation on line lithium ion battery life-span
Estimated life, can obtain a modifying factor.By the modifying factor, can be to after by existing
The method battery estimated life that obtains of estimation in some estimation on line lithium ion battery life-spans be modified from
And obtain the life-span of more accurate lithium ion battery.
Based on this, according to another aspect of the disclosure, in one embodiment, there is provided Yi Zhongyong
In it is determined that lithium ion battery estimated life modifying factor method.The method includes：To lithium ion
Battery is charged；At the first moment, the first SOC of the lithium ion battery is obtained；
At two moment, obtain the second SOC of the lithium ion battery；Based on the first acquired charged shape
State value and the second SOC, determine that the state-of-charge of the lithium ion battery is interval；Based on being determined
State-of-charge is interval, the nominal capacity of the lithium ion battery and in charging process to the lithium ion
The capacity that battery is filled with, determines the life-span of the lithium ion battery；And based on the identified lithium ion
The life-span of battery and the estimated life of the lithium ion battery, determine the estimated life of the lithium ion battery
Modifying factor.Wherein, the estimated life of the lithium ion battery can online be estimated by including existing
Calculate the estimation lithium-ion electric that the method in lithium ion battery life-span goes out in interior all known or future developments
The method in pond life-span is obtained to estimate.
In one example, determining the life-span of the lithium ion battery can be realized by below equation：
SOH=C/ (SOC2-SOC1)/CRate
Wherein, SOH represents the life-span of identified lithium ion battery, and C is represented and lithium ion battery is filled
The capacity for entering, SOC1 represents the first SOC, and SOC2 represents the second SOC,
(SOC2-SOC1) represent that state-of-charge is interval, CRateRepresent nominal capacity.
In one example, determine that the modifying factor of the estimated life of the lithium ion battery can be by following
Formula is realized：
Δ SOH=SOH-SOH '
Wherein, Δ SOH represents modifying factor, and SOH represents the life-span of the identified lithium ion battery,
SOH ' represents the estimated life of the lithium ion battery.
By modifying factor determined by the presently disclosed embodiments, the lithium that can be obtained to after from
The estimated life of sub- battery is modified, so as to obtain the life-span of more accurate lithium ion battery.
Brief description of the drawings
The further feature of the disclosure, feature, advantage and benefit are by the detailed description below in conjunction with accompanying drawing
Will become apparent.
The method that Fig. 1 shows the life-span of the determination lithium ion battery of the one embodiment according to the disclosure；
And
Fig. 2 shows the estimated life of the determination lithium ion battery of the one embodiment according to the disclosure
The method of modifying factor.
Specific embodiment
The basic conception of the disclosure is that in specific state-of-charge is interval, lithium ion battery is filled with
Capacity it is related to the life-span of the nominal capacity of the lithium ion battery and the lithium ion battery, by this
Relation, nominal capacity, specific state-of-charge interval and the lithium ion in known lithium ion battery
Battery be filled with capacity in the case of, the life information of the lithium ion battery can be obtained.
Embodiment below in conjunction with accompanying drawing various aspects of this disclosure is described.
The method that Fig. 1 shows the life-span of the determination lithium ion battery of the one embodiment according to the disclosure
Flow chart.Reference picture 1, in block 101, starts to charge the lithium ion battery.For example, can
The lithium ion battery is charged with by onboard charger.
In block 102, at the first moment in charging process, the first lotus of the lithium ion battery is obtained
Electricity condition value SOC1.That is, first SOC SOC1 corresponding time points are exactly to fill
First moment in electric process.In one example, if the open-circuit voltage of the lithium ion battery
(open circuit voltage, OCV) is presented specific relation with state-of-charge, then can be by this
The open-circuit voltage of lithium ion battery obtains corresponding SOC.For example, for ternary material
For lithium ion battery, can be bent according to the open-circuit voltage of the ternary material lithium ion battery-state-of-charge
Line, and the charged of the lithium ion battery is obtained based on the open-circuit voltage of the lithium ion battery for being obtained
State value.
In one example, first moment can be charging initial time.In the lithium ion battery
In the case of open-circuit voltage is presented particular kind of relationship with state-of-charge, based on the lithium ion battery in the charging
The open-circuit voltage of initial time, can obtain the first corresponding SOC SOC1.
Advantageously, in order to obtain more accurate first SOC SOC1, can first by the lithium from
Sub- battery standing for a period of time so that its open-circuit voltage is a voltage for stabilization.Based on this, filling
At the electrical initiation moment, can first judge whether the lithium ion battery has stood scheduled duration.The pre- timing
Length can be able to ensure that the open-circuit voltage of the lithium ion battery is any of relatively stable voltage
Appropriate numerical value.Can in several ways realize judging whether the lithium ion battery has stood predetermined
Duration, for example, can be by judging the controller of the lithium ion battery, for example battery management system
(BMS) whether lower electric duration has reached predetermined value to judge whether the lithium ion battery has stood
Scheduled duration.Similarly, the predetermined value can be that the open-circuit voltage for being able to ensure that the lithium ion battery is
The one any appropriate numerical value of relatively stable voltage, such as 1 hour.In general, lithium ion
The lower electric duration of the standing duration more than the controller of the lithium ion battery of battery, therefore, in predetermined value
For such as 1 hour in the case of, the time of repose of the lithium ion battery, namely the scheduled duration may
More than 1 hour.
When judging that obtaining the lithium ion battery has stood the scheduled duration, based on the lithium ion battery
Current open circuit voltage and according to the open-circuit voltage-state-of-charge curve of the lithium ion battery, it is possible to
Determine the first SOC SOC1 of the lithium ion battery.
In block 103, at the second moment in charging process, the second lotus of the lithium ion battery is obtained
Electricity condition value SOC2.That is, second SOC SOC2 corresponding time points are exactly to fill
Second moment in electric process.In one example, second moment can be charging finishing time.
In the case of the open-circuit voltage of the lithium ion battery is presented particular kind of relationship with state-of-charge, based on the lithium
Open-circuit voltage of the ion battery in the charging finishing time, can obtain the second corresponding state-of-charge
Value SOC2.
Normally, in the latter stage charged to lithium ion battery, charging current is very small, belongs to
The trickle charge phase, under this electric current, the voltage of lithium ion battery has been essentially close to open-circuit voltage,
Therefore, in the case of particular kind of relationship being presented between the open-circuit voltage and state-of-charge of the lithium ion battery,
Based on the voltage in the trickle charge phase, can obtain the corresponding lithium ion battery second is charged
State value.Based on this, in charging process, it can be determined that to the charging of the lithium ion battery whether
Into the trickle charge phase.If the charging to the lithium ion battery has been enter into the trickle charge phase, can be with
Obtain voltage of the lithium ion battery in the trickle charge phase.Then, in charging finishing time, based on institute
Voltage of the lithium ion battery for obtaining in the trickle charge phase, and according to the open circuit electricity of the lithium ion battery
Pressure-state-of-charge curve, it may be determined that the second SOC SOC2 of the lithium ion battery.
In block 104, based on the first SOC SOC1 and the second SOC SOC2, really
State-of-charge interval (SOC2-SOC1) of the fixed lithium ion battery.
For at the first moment, such as charging initial time to the second moment, such as charging finishing time
The capacity C that period is filled with to the lithium ion battery, can for example, by first moment to this second
The electric current for being filled with the lithium ion battery is integrated to obtain in the time at moment.
In block 105, the state-of-charge based on the identified lithium ion battery is interval
(SOC2-SOC1), the nominal capacity C of the lithium ion batteryRateAnd in charging process to the lithium from
The capacity C that sub- battery is filled with, determines the life-span SOH of the lithium ion battery.
In one example, the life-span SOH of the lithium ion battery can be determined by below equation：
SOH=C/ (SOC2-SOC1)/CRate
Compared to the method in estimation lithium ion battery life-span of the prior art, the presently disclosed embodiments
The method in determination lithium ion battery life-span be obtained in that life-span of more accurate lithium ion battery.
It is understood that due to the life-span of lithium ion battery determined according to the presently disclosed embodiments
It is more accurate, therefore, the life-span based on the lithium ion battery determined according to the presently disclosed embodiments with
And the longevity is estimated based on the battery obtained according to the estimation of the method in existing estimation on line lithium ion battery life-span
Life, can obtain the modifying factor in lithium ion battery life-span.By the modifying factor, can be right
The battery estimated life for obtaining is estimated by the method in existing estimation on line lithium ion battery life-span afterwards
It is modified.In other words, there is the modifying factor, even if used in certain time period after
It is that the method in existing estimation on line lithium ion battery life-span obtains estimation longevity of lithium ion battery to estimate
Life, it is also possible to be modified using the modifying factor so as to obtain more accurate lithium ion battery
Life-span.
Based on this, the disclosure provides a kind of estimation for determining lithium ion battery in another embodiment
The method of the modifying factor in life-span.Reference picture 2, the block 201,202,203,204 and 205 of the method
The block 101,102,103,104 and 105 being functionally similar in Fig. 1 for performing, its difference is,
Fig. 2 also includes block 206.In the block 206, based on the lithium ion battery determined in block 205
Life-span and the estimated life based on the lithium ion battery estimated, determine estimating for the lithium ion battery
Calculate the modifying factor in life-span.
In one example, the amendment of the estimated life of the lithium ion battery can be determined by following formula
The factor：
Δ SOH=SOH-SOH '
Wherein, Δ SOH represents modifying factor, and SOH represents the life-span of the identified lithium ion battery,
SOH ' represents the estimated life of the lithium ion battery estimated.
It should be noted that the estimated life SOH ' of the lithium ion battery can by including it is existing
The estimation lithium that the method in line estimation lithium ion battery life-span goes out in interior all known or future developments from
The method of sub- battery life is obtained to estimate.
It will be appreciated by those skilled in the art that each embodiment disclosed above can be without departing from invention
Various changes and modifications are made in the case of essence.Therefore, the protection domain of the disclosure should be by appended
Claims limit.
Claims (10)
1. a kind of method for determining the life-span of lithium ion battery, methods described includes：
The lithium ion battery is charged；
At the first moment, the first SOC of the lithium ion battery is obtained；
At the second moment, the second SOC of the lithium ion battery is obtained；
Based on first SOC and second SOC, the lithium-ion electric is determined
The state-of-charge in pond is interval；
The state-of-charge based on the lithium ion battery is interval, the lithium ion battery nominal appearance
Amount and the capacity being filled with to the lithium ion battery in charging process, determine the lithium ion battery
Life-span.
2. method according to claim 1, wherein, the institute for determining the lithium ion battery
Stating the life-span includes：
The state-of-charge based on the lithium ion battery is interval, the nominal appearance of the lithium ion battery
Amount and the capacity being filled with to the lithium ion battery in charging process, and by below equation,
To determine the life-span of the lithium ion battery,
SOH=C/ (SOC2-SOC1)/CRate
Wherein, SOH represents the life-span of the identified lithium ion battery, and C is represented to described
The capacity that lithium ion battery is filled with, SOC1 represents first SOC, and SOC2 is represented
Second SOC, (SOC2-SOC1) represents that the state-of-charge is interval, CRateRepresent described
Nominal capacity.
3. method according to claim 1, wherein, first moment is charging initial time,
First SOC for obtaining the lithium ion battery includes：
In the charging initial time, judge whether the lithium ion battery has stood scheduled duration；
If the lithium ion battery has stood scheduled duration, currently opening based on the lithium ion battery
Road voltage and according to the open-circuit voltage-state-of-charge curve of the lithium ion battery, determine the lithium from
First SOC of sub- battery.
4. method according to claim 3, wherein, it is described whether to judge the lithium ion battery
Having stood the scheduled duration includes：
Obtain the lower electric duration of the controller of the lithium ion battery；
Judge whether the described lower electric duration of the controller has reached predetermined value；
If the described lower electric duration of the controller has reached the predetermined value, the battery has been determined
Stand the scheduled duration.
5. method according to claim 4, wherein, the predetermined value is 1 hour.
6. method according to claim 1, wherein, second moment is charging finishing time,
Second SOC for obtaining the lithium ion battery includes：
Judge whether the trickle charge phase is had been enter into the charging of the lithium ion battery；
If having been enter into the trickle charge phase to the charging of the lithium ion battery, obtain the lithium from
Voltage of the sub- battery in the trickle charge phase；
In the charging finishing time, based on the lithium ion battery described in the trickle charge phase
Voltage and according to the open-circuit voltage-state-of-charge curve of the lithium ion battery, determines the lithium-ion electric
Second SOC in pond.
7. method according to claim 1, wherein, the lithium ion battery is filled with described in
Capacity is obtained in the following manner：
To being filled with the electricity of the lithium ion battery within the time at first moment to second moment
Stream is integrated to obtain the capacity for being filled with the lithium ion battery in the charging process.
8. method according to claim 1, wherein, the lithium ion battery includes ternary material
Lithium ion battery.
9. a kind of method for determining the modifying factor of the estimated life of lithium ion battery, methods described
Including：
The lithium ion battery is charged；
At the first moment, the first SOC of the lithium ion battery is obtained；
At the second moment, the second SOC of the lithium ion battery is obtained；
Based on first SOC and second SOC, the lithium-ion electric is determined
The state-of-charge in pond is interval；
The state-of-charge based on the lithium ion battery is interval, the lithium ion battery nominal appearance
Amount and the capacity being filled with to the lithium ion battery in charging process, determine the lithium ion battery
Life-span；
The estimation in the life-span and the lithium ion battery based on the identified lithium ion battery
In the life-span, determine the modifying factor of the estimated life of the lithium ion battery.
10. method according to claim 9, wherein, it is described to determine the lithium ion battery
The life-span includes：
The state-of-charge based on the lithium ion battery is interval, the nominal appearance of the lithium ion battery
Amount and the capacity being filled with to the lithium ion battery in charging process, and by below equation,
To determine the life-span of the lithium ion battery,
SOH=C/ (SOC2-SOC1)/CRate
Wherein, SOH represents the life-span of the identified lithium ion battery, and C is represented to described
The capacity that lithium ion battery is filled with, SOC1 represents first SOC, and SOC2 is represented
Second SOC, (SOC2-SOC1) represents that the state-of-charge is interval, CRateRepresent described
Nominal capacity；And
The modifying factor of the estimated life for determining the lithium ion battery includes：
Based on described in the life-span of the identified lithium ion battery and the lithium ion battery
Estimated life, and determined by below equation the lithium ion battery estimated life it is described
Modifying factor：
Δ SOH=SOH-SOH '
Wherein, Δ SOH represents the modifying factor, and SOH ' represents that the described of the lithium ion battery is estimated
Calculate the life-span.
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| CN107742755A (en) * | 2017-09-27 | 2018-02-27 | 安徽江淮汽车集团股份有限公司 | Electric automobile SOH modification methods and device |
| CN108287315A (en) * | 2018-01-12 | 2018-07-17 | 北京新能源汽车股份有限公司 | Power battery method for monitoring operation states, device and electric vehicle |
| CN108931738A (en) * | 2018-08-22 | 2018-12-04 | 中国电力科学研究院有限公司 | A kind of method and system of health status that assessing lithium battery |
| CN109188296A (en) * | 2018-09-14 | 2019-01-11 | 郑州云海信息技术有限公司 | A kind of BBU electricity method of calibration, device, terminal and FCC calculation method |
| CN109298348A (en) * | 2018-11-30 | 2019-02-01 | 北京长城华冠汽车科技股份有限公司 | The life estimation method of battery |
| CN109425835A (en) * | 2017-08-21 | 2019-03-05 | 郑州宇通客车股份有限公司 | A kind of battery life, the vehicle performance test method and system based on big data |
| CN110210147A (en) * | 2019-06-05 | 2019-09-06 | 杭州华塑加达网络科技有限公司 | The simulator and emulation mode of estimating state of health of battery |
| CN110579718A (en) * | 2019-09-03 | 2019-12-17 | 北京海博思创科技有限公司 | method and device for acquiring SOH (state of health) of battery and battery pack |
| CN111025168A (en) * | 2019-11-29 | 2020-04-17 | 淮南师范学院 | Battery health state monitoring device and battery state of charge intelligent estimation method |
| CN112526352A (en) * | 2020-12-17 | 2021-03-19 | 合肥工业大学 | SOH estimation method for retired lithium ion battery |
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| CN109425835B (en) * | 2017-08-21 | 2021-12-21 | 郑州宇通客车股份有限公司 | Battery life and big data-based vehicle performance detection method and system |
| CN109425835A (en) * | 2017-08-21 | 2019-03-05 | 郑州宇通客车股份有限公司 | A kind of battery life, the vehicle performance test method and system based on big data |
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| CN108287315A (en) * | 2018-01-12 | 2018-07-17 | 北京新能源汽车股份有限公司 | Power battery method for monitoring operation states, device and electric vehicle |
| CN108931738A (en) * | 2018-08-22 | 2018-12-04 | 中国电力科学研究院有限公司 | A kind of method and system of health status that assessing lithium battery |
| CN109188296A (en) * | 2018-09-14 | 2019-01-11 | 郑州云海信息技术有限公司 | A kind of BBU electricity method of calibration, device, terminal and FCC calculation method |
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| CN110210147A (en) * | 2019-06-05 | 2019-09-06 | 杭州华塑加达网络科技有限公司 | The simulator and emulation mode of estimating state of health of battery |
| CN110579718A (en) * | 2019-09-03 | 2019-12-17 | 北京海博思创科技有限公司 | method and device for acquiring SOH (state of health) of battery and battery pack |
| CN111025168A (en) * | 2019-11-29 | 2020-04-17 | 淮南师范学院 | Battery health state monitoring device and battery state of charge intelligent estimation method |
| CN112526352A (en) * | 2020-12-17 | 2021-03-19 | 合肥工业大学 | SOH estimation method for retired lithium ion battery |
| CN112526352B (en) * | 2020-12-17 | 2023-10-31 | 合肥工业大学 | SOH estimation method for retired lithium ion battery |
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