CN109613444A - A kind of retired health state of lithium ion battery appraisal procedure - Google Patents
A kind of retired health state of lithium ion battery appraisal procedure Download PDFInfo
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Abstract
The present invention relates to a kind of retired health state of lithium ion battery appraisal procedures, include: high-frequency ac impedance (R1) and low-frequency ac impedance (R2) measured under the same state-of-charge of battery, obtains the difference of high-frequency ac impedance (R1) Yu low-frequency ac impedance (R2)；According to the difference of high-frequency ac impedance (R1) and low-frequency ac impedance (R2), itself and high-frequency ac impedance obtained by calibrating are compared with the difference of low-frequency ac impedance with the relationship of remaining battery life, so that it is determined that the remaining life of the battery.The present invention significantly shortens the cell health state assessment time, improves assessment efficiency, reduce evaluation and test cost without collecting the complete AC impedance spectroscopy of mesuring battary.
Description
Technical field
The present invention relates to a kind of retired health state of lithium ion battery appraisal procedures, belong to technical field of lithium ion.
Background technique
Lithium ion battery is because of its voltage height, the advantages of energy density is big, and self-discharge rate is low and long service life, is answered extensively
For the large-scale energy storage system such as electric car, energy-accumulating power station.With the passage for using the time, a large amount of lithium ion batteries will be moved back
Labour, secondary use technology urgently develop.Wherein, more it is important that health state of lithium ion battery (State of
Health, SOH) assessment technology, due to from vehicle or battery consistency that energy-accumulating power station is resigned from office is extremely discrete, by fast
Speed accurately evaluates and tests means, assesses the remaining life of retired battery, and the echelon that lithium battery may be implemented utilizes, and extends its use
Service life.SOH assessment at present is still in conceptual phase, lacks quickly and effectively assessment technology, has research institution to pass through comparative analysis
The AC impedance curve of different times is assessed.For example, application publication number is the Chinese invention patent Shen of CN107076801A
Please file disclose the electrochemical impedance spectroscopy in a kind of battery management system, judge that battery is strong by frequency and the relationship of impedance
Health state.But this method will collect the AC impedance curve of battery full frequency band, take a long time, inefficiency, test result by
Environment influences also larger, it is more difficult to promote and apply in the actual production process.
Summary of the invention
The object of the present invention is to provide a kind of retired health state of lithium ion battery appraisal procedures, for solving existing electricity
The problem of pond health state evaluation method inefficiency.
In order to solve the above technical problems, the present invention provides a kind of retired health state of lithium ion battery appraisal procedure, step
It is rapid as follows:
The high-frequency ac impedance (R1) under the same state-of-charge of battery and low-frequency ac impedance (R2) are measured, high frequency friendship is obtained
The difference of flow impedance (R1) and low-frequency ac impedance (R2), the difference table of high-frequency ac impedance (R1) and low-frequency ac impedance (R2)
It is shown as: electrochemical impedance (R)=high-frequency ac impedance (R1)-low-frequency ac impedance (R2)；
According to the difference of the high-frequency ac impedance (R1) and low-frequency ac impedance (R2), by itself and high frequency obtained by calibrating
AC impedance is compared with the difference of low-frequency ac impedance with the relationship of remaining battery life, so that it is determined that the residue of the battery
Service life.
The beneficial effects of the present invention are: the exchange resistance of two different frequencies by the measurement same state-of-charge of mesuring battary
It is anti-, the difference of two AC impedances and the relationship of remaining battery life of the difference of two AC impedances and calibration are carried out pair
Than the remaining life of the mesuring battary can be obtained, and then obtain the health status of the mesuring battary, without collecting mesuring battary
Complete AC impedance spectroscopy, significantly shorten cell health state assessment the time, improve assessment efficiency, reduce evaluation and test at
This.
Further, in order to accurately obtain high-frequency ac impedance, the corresponding frequency >=1kHz of high-frequency ac impedance (R1).
Further, in order to accurately obtain low-frequency ac impedance, the corresponding frequency≤0.1Hz of low-frequency ac impedance (R2).
Further, it in order to accurately obtain the difference of two AC impedances and the calibration relationship of remaining battery life, demarcates
The step of relationship of the difference and remaining battery life of high-frequency ac impedance and low-frequency ac impedance includes: to choose retired battery sample
This, adjusts its state-of-charge to set point value, test its after different cycle charge-discharge numbers high-frequency ac impedance with it is low
The difference of frequency AC impedance；To obtain the difference of high-frequency ac impedance and low-frequency ac impedance and the pass of cycle charge-discharge number
System, and then obtain the difference of high-frequency ac impedance and low-frequency ac impedance and the relationship of remaining life.
Further, for the health status of quick obtaining battery to be measured, high-frequency ac impedance and low-frequency ac are hindered
Anti- difference is classified, and the corresponding cycle charge-discharge number of different grades is obtained.
Detailed description of the invention
Fig. 1 is the flow chart of the retired health state of lithium ion battery appraisal procedure of the present invention；
Fig. 2 is between the electrochemical impedance, cycle charge-discharge number and capacity retention ratio of the retired battery sample of the present invention
Relational graph.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, below in conjunction with attached drawing and specific implementation
The present invention will be described in further detail for example.
A kind of retired health state of lithium ion battery appraisal procedure is present embodiments provided, this method can be gone out with accurate evaluation
The health status of retired lithium ion battery, and be easy to promote and apply, corresponding flow chart is as shown in Figure 1, include following step
It is rapid:
(1) the high-frequency ac impedance R1 and low-frequency ac impedance R2 under the same state-of-charge of battery are measured, high frequency friendship is obtained
The difference of flow impedance R1 and low-frequency ac impedance R2, the difference indicate are as follows: electrochemical impedance R=high-frequency ac impedance R1- low frequency
AC impedance R2.
Wherein, battery to be measured is retired lithium ion battery, and the retired lithium ion battery is at least through 500 circulations
Charge and discharge, residual capacity account for the ratio of original nominal capacity between 50%-95%, and original nominal capacity, that is, battery is dispatching from the factory
When nominal capacity.
Corresponding frequency≤the 0.1Hz of high-frequency ac impedance R1 corresponding frequency >=1kHz, low-frequency ac impedance R2.It is realizing
When, corresponding test equipment can be researched and developed according to the corresponding frequency of high-frequency ac impedance R1 and low-frequency ac impedance R2, to realize
The quick test of high-frequency ac impedance R1 and low-frequency ac impedance R2, and then obtain high-frequency ac impedance R1 and low-frequency ac impedance
The difference of R2, that is, electrochemical impedance R.Measuring high-frequency ac impedance R1 and when low-frequency ac impedance R2, need to guarantee to
The state-of-charge of measurement battery is consistent.
Certainly, when measuring high-frequency ac impedance R1 and low-frequency ac impedance R2, existing respective frequencies can also be used
Test equipment, without special research and development.For example, high-frequency test equipment belongs to mature and stable equipment, without researching and developing again.
(2) electrochemical impedance R is compared with electrochemical impedance obtained by calibrating with the relationship of remaining battery life, from
And determine the remaining life of the battery.
Wherein, the step of relationship of calibration electrochemical impedance and remaining battery life includes: to choose retired battery sample, is adjusted
Its whole state-of-charge tests it in the electrochemical impedance after different cycle charge-discharge numbers to set point value；To obtain electricity
The relationship of chemical impedance and cycle charge-discharge number, and then obtain the relationship of electrochemical impedance and remaining life.
Wherein, it in order to improve the accuracy of calibration relationship of electrochemical impedance and remaining battery life and comprehensive, chooses
Retired battery sample state-of-charge between 0%-100%, measure retired battery sample in 0%-100% state-of-charge
(SOC) change curve under, and the state-of-charge of more plateau region is selected, set point value when as test is charged to reduce
Influence of the state inaccuracy to test result.Wherein, in the present embodiment, retired battery sample is substantially in 40-60%SOC range
Internal impedance test data relative different is smaller, and the SOC finally used is 50%.Each retired battery sample is measured respectively passes through 0,
High-frequency ac impedance R1 and low-frequency ac impedance R2 after 100,200,300 ... secondary cycle charge-discharge numbers, according to formula R=
Electrochemical impedance R is calculated in R2-R1, and records corresponding capacity retention ratio, and acquired test data is as shown in table 1.
Table 1
It, can will be electrochemical in order to obtain the relationship of calibrated electrochemical impedance Yu cycle charge-discharge number (cycle life)
Impedance classification is learned, to obtain the corresponding cycle charge-discharge number of different brackets.It is, during the calibration process, electrochemistry is hindered
Anti- to be divided into different sections, different sections represents different cycle charge-discharge numbers.As shown in Fig. 2, the electricity that will be calculated
Chemical impedance R is classified, such as 0.2-0.3,0.3-0.4,0.4-0.6, and > 0.6 etc., different grade corresponds to different circulations
Charge and discharge number and different capacity retention ratio (residual capacity).Referring to Fig. 2 that calibration process obtains, if battery electrochemical hinders
Resist between 0.2-0.3, battery remaining power is between 70%-80%；If battery electrochemical impedance is between 0.3-0.4, electricity
Pond residual capacity is between 60%-70%；If battery electrochemical impedance is between 0.4-0.6, battery remaining power is in 40%-
Between 60%；If battery electrochemical impedance is greater than 0.6, battery remaining power is below 40%.Battery remaining power (the remaining longevity
Life) it is an important indicator for judging retired cell health state.
By the relationship of the electrochemical impedance of battery to be measured and electrochemical impedance obtained by calibrating and remaining battery life into
Row compares, and sees which electrochemical impedance grade the electrochemical impedance of the battery to be measured falls in, obtains the battery pair to be measured
The cycle charge-discharge number answered, and then the corresponding remaining life of the battery to be measured is obtained, so that it is determined that the battery to be measured
Health status.
Finally it should be noted that the above examples are only used to illustrate the technical scheme of the present invention rather than to its protection scope
Limitation, although the application is described in detail referring to above-described embodiment, those of ordinary skill in the art should
Understand, those skilled in the art read the specific embodiment of application can still be carried out after the application various changes, modification or
Person's equivalent replacement, but these changes, modification or equivalent replacement, within the scope of the claims of the present invention.
Claims (5)
1. a kind of retired health state of lithium ion battery appraisal procedure, which is characterized in that steps are as follows:
The high-frequency ac impedance (R1) under the same state-of-charge of battery and low-frequency ac impedance (R2) are measured, high-frequency ac resistance is obtained
The difference of anti-(R1) and low-frequency ac impedance (R2), the difference expression of high-frequency ac impedance (R1) and low-frequency ac impedance (R2)
Are as follows: electrochemical impedance (R)=high-frequency ac impedance (R1)-low-frequency ac impedance (R2)；
According to the difference of the high-frequency ac impedance (R1) and low-frequency ac impedance (R2), by itself and high-frequency ac obtained by calibrating
Impedance is compared with the difference of low-frequency ac impedance with the relationship of remaining battery life, so that it is determined that the remaining longevity of the battery
Life.
2. retired health state of lithium ion battery appraisal procedure according to claim 1, which is characterized in that high-frequency ac resistance
Anti- (R1) corresponding frequency >=1kHz.
3. retired health state of lithium ion battery appraisal procedure according to claim 1, which is characterized in that low-frequency ac resistance
Anti- (R2) corresponding frequency≤0.1Hz.
4. retired health state of lithium ion battery appraisal procedure according to any one of claim 1-3, which is characterized in that
The step of relationship of the difference and remaining battery life of calibration high-frequency ac impedance and low-frequency ac impedance includes: to choose retired electricity
Pond sample adjusts its state-of-charge to set point value, tests it in the high-frequency ac impedance after different cycle charge-discharge numbers
With the difference of low-frequency ac impedance；To obtain the difference and cycle charge-discharge number of high-frequency ac impedance and low-frequency ac impedance
Relationship, and then obtain the difference of high-frequency ac impedance and low-frequency ac impedance and the relationship of remaining life.
5. retired health state of lithium ion battery appraisal procedure according to claim 4, which is characterized in that by high-frequency ac
The difference of impedance and low-frequency ac impedance is classified, and the corresponding cycle charge-discharge number of different grades is obtained.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111562511A (en) * | 2020-04-03 | 2020-08-21 | 中国电力科学研究院有限公司 | Method and system for determining health state of retired power battery |
| CN111896879A (en) * | 2020-07-31 | 2020-11-06 | 北京石墨烯研究院 | Rapid detection method for bending life of flexible lithium ion battery |
| CN112327171A (en) * | 2020-11-30 | 2021-02-05 | 同济大学 | Lithium ion battery life estimation method based on relaxation time distribution |
| CN113391229A (en) * | 2021-05-14 | 2021-09-14 | 国网河北省电力有限公司经济技术研究院 | Performance evaluation method, equipment and system for retired power battery |
| CN114720878A (en) * | 2022-03-24 | 2022-07-08 | 长安大学 | Method for detecting state of retired battery |
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|---|---|---|---|---|
| CN111562511A (en) * | 2020-04-03 | 2020-08-21 | 中国电力科学研究院有限公司 | Method and system for determining health state of retired power battery |
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| CN111896879A (en) * | 2020-07-31 | 2020-11-06 | 北京石墨烯研究院 | Rapid detection method for bending life of flexible lithium ion battery |
| CN112327171A (en) * | 2020-11-30 | 2021-02-05 | 同济大学 | Lithium ion battery life estimation method based on relaxation time distribution |
| CN112327171B (en) * | 2020-11-30 | 2021-11-09 | 同济大学 | Lithium ion battery life estimation method based on relaxation time distribution |
| CN113391229A (en) * | 2021-05-14 | 2021-09-14 | 国网河北省电力有限公司经济技术研究院 | Performance evaluation method, equipment and system for retired power battery |
| CN113391229B (en) * | 2021-05-14 | 2022-04-08 | 国网河北省电力有限公司经济技术研究院 | Performance evaluation method, equipment and system for retired power battery |
| CN114720878A (en) * | 2022-03-24 | 2022-07-08 | 长安大学 | Method for detecting state of retired battery |
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Application publication date: 20190412 |