CN102854394A - System for estimating health state of lithium ion battery and method for estimating health state of lithium ion battery by using same - Google Patents
System for estimating health state of lithium ion battery and method for estimating health state of lithium ion battery by using same Download PDFInfo
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- CN102854394A CN102854394A CN2012103170861A CN201210317086A CN102854394A CN 102854394 A CN102854394 A CN 102854394A CN 2012103170861 A CN2012103170861 A CN 2012103170861A CN 201210317086 A CN201210317086 A CN 201210317086A CN 102854394 A CN102854394 A CN 102854394A
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Abstract
The invention discloses a system for estimating a health state of a lithium ion battery and a method for estimating the health state of the lithium ion battery by using the system. The system comprises a single chip central control module, an alternating-current pulse output module for outputting an alternating-current pulse, a battery module and a display module, wherein the single chip central control module is connected with the alternating-current pulse output module, the battery module and the display module respectively; the alternating-current pulse output module is connected with the battery module; and the battery module is a lithium ion power battery. The system for estimating health state of lithium ion battery is simple in structure, specially aims at the lithium ion battery, and can be used for accurately and quickly measuring actual internal resistance value and impedance of internal chemical constituents in the lithium ion power battery on line and determining an actual state of the lithium ion battery.
Description
Technical field
The present invention relates to estimating system, particularly relate to lithium ion battery health status estimating system.
The invention still further relates to and utilize said system to the method for lithium ion battery health status estimation.
Background technology
International Power association (IEEE1118-1996) has formulated since the standard with the routine test internal resistance prediction life of storage battery for battery service, and China's Ministry of Information Industry's post and telecommunications industrial product quality Supervision Test Center has also carried out augmenting of internal resistance standard to YD/799-2002.Along with the popularizing of the development of domestic economy and social information, communication power supply, network energy supply, powerplant module, generation distribution, and the battery pack quantity that all trades and professions are used is increased sharply.Last link of power supply in support accomplishes important guarantee and the foundation that accumulator can be provided stablize the reserve tenability is not only in the accurate understanding of the online quality state of accumulator, and is conducive to the accumulator resource and is optimized integration.
Lithium-ion-power cell is along with the increase of service time and cycle index, all can be progressively aging, its senile cause mainly is because electrode current collecting body oxidation, electrolyte decomposition, active substance come off etc., causes battery can't continue the electric weight output that keeps good.By the estimation of cell health state, changing for the maintenance of battery provides foundation.
International Power association (IEEE1118-1996) regulation, when the capacity loss of battery to the battery nominal capacity 80% the time be behindhand battery, just need to change battery, health status represents that with SOH its computing formula is SOH=(current capacity-nominal capacity)/nominal capacity.
Because capacity test method is consuming time longer, International Power association stipulates that in (IEEE1118-2005) significantly internal resistance of cell value changes the performance depreciation that means battery.Its computing formula is SOH=(current dynamic internal resistance value-initial internal resistance)/initial internal resistance.
The main method of testing of current battery health status and system comprise several:
(1) internal resistance method of testing.The correlativity of internal resistance and capacity is: when the internal resistance of battery greater than initial value (base value) 25% the time, battery can't be by volume test.When the internal resistance of battery during greater than 2 times of initial value, the capacity of battery will be at below 80% of its rated capacity.Mainly adopted alien frequencies method (alternating-current measurement method) test of international popular based on the accumulator internal resistance tester of this release, add a specific AC signal (I) by accumulators, then with the pressure drop (U) on the high-performance band-pass filter device detection accumulator internal resistance, R=U/I.Internal resistance method convenient test no matter whether accumulator is full of electricity, all can be tested.Can on-line testing, also can off-line test, test speed is fast, is suitable for big-bang testing.
But the internal resistance of the method test gained and the Relation Parameters of capacity are based on lead-acid accumulator, are not for lithium-ion-power cell, and this test parameter is not suitable for lithium-ion-power cell.The test of internal resistance method of testing obtains, the resistance between the inside collector metallic conductor of battery just, can not obtain the actual collector of lithium-ion-power cell inside and the resistance between the active material, resistance between active material and the electrolytic solution, resistance between electrolytic solution and the barrier film, the lithium ion migration resistance in the electrolytic solution course of work.So the method can accurately not record the actual inside resistance size of lithium-ion-power cell.
(2) actual capacity method of testing.By certain electric current (I) accumulator is discharged into used time (T) of minimum permission voltage of accumulator, Q=I*T extrapolates the actual capacity of accumulator.Actual capacity by battery and the ratio of initial capacity are calculated the health status of battery.The method can only off-line test, and it is very large to pull down the battery-operated amount; In the test process, at first must make accumulator to be measured be full of first electricity, then could begin discharge test, need a large amount of time in the charging and discharging process.The method is not suitable for the on-line measurement of lithium-ion-power cell health status, and is not suitable for Quick Measurement.
Summary of the invention
The present invention finishes in order to solve deficiency of the prior art, the purpose of this invention is to provide simple in structure, specially for lithium ion battery, exactly online Fast Measurement lithium-ion-power cell actual inside resistance and inner each chemical composition impedance and determine the lithium ion battery health status estimating system of lithium ion battery actual state.
Lithium ion battery health status estimating system of the present invention, the alternating-current pulse output module, battery module and the display module that comprise single-chip microcomputer central control module, output AC pulse, described single-chip microcomputer central control module is connected with alternating-current pulse output module, battery module and display module respectively, described alternating-current pulse output module be connected battery module and connect, described battery module is lithium-ion-power cell.
Lithium ion battery health status estimating system of the present invention can also be:
Described alternating-current pulse output module is exported respectively the alternating-current pulse signal of two kinds of frequencies to connected battery module.
Described alternating-current pulse output module is exported respectively the alternating-current pulse signal of 5963Hz and 3Hz frequency to connected battery module.
Described single-chip microcomputer central control module comprises the data receiver part, the data analysis part, data processing section and transmitting portion as a result, described data receiver part is connected with battery module and is used for receiving the response signal data that battery module is made for the alternating-current pulse signal of alternating-current pulse output, described data analysis part partly is connected the response signal data that receives for analysis with described data receiver, described data processing section partly is connected for processing analyzing rear response signal data with described data analysis, and described as a result transmitting portion is connected the result who is used for data are processed with data processing section respectively and is presented at display module with display module.
Described alternating-current pulse output module comprises high speed D/A data-switching part, high-frequency operational amplifier and Technitron, described high frequency is that frequency is more than 6MHz, described high speed D/A data-switching part is connected with described single-chip microcomputer central control module output terminal, and described high speed D/A data-switching part is connected with Technitron with high-frequency operational amplifier respectively.
Described single-chip microcomputer central control module is the high single-frequency sheet of PIC machine, and described battery module partly is connected with the data receiver of described single-chip microcomputer central control module.
Described display module is LCDs or LED light, and described display module is connected with the as a result transmitting portion of described single-chip microcomputer central control module.
Lithium ion battery health status estimating system of the present invention, the alternating-current pulse output module, battery module and the display module that comprise single-chip microcomputer central control module, output AC pulse, described single-chip microcomputer central control module is connected with alternating-current pulse output module, battery module and display module respectively, described alternating-current pulse output module be connected battery module and connect, described battery module is lithium-ion-power cell.Like this, during use, single-chip microcomputer central control module control alternating-current pulse output module is to the alternating-current pulse signal of battery module output different frequency, battery module is made different response signals to different alternating-current pulse signals, these different response signals are sent to the single-chip microcomputer central control module, and the single-chip microcomputer central control module receives, analyzes and process the lithium ion battery health status that draws estimation and be sent to display module and shows to above-mentioned response signal data.Therefore with respect to the advantage of prior art be simple in structure, specially for lithium ion battery, exactly online Fast Measurement lithium-ion-power cell actual inside resistance and inner each chemical composition impedance and determine the lithium ion battery actual state.
Another goal of the invention of the present invention provides uses above-mentioned lithium ion battery health status estimating system to the method for lithium ion battery health status estimation.The method is from the estimation of starting with of the bottom Electrochemistry Information of lithium ion battery, more near the battery actual state, and can On-line rapid measurement and estimation.
Use lithium ion battery health status estimating system of the present invention may further comprise the steps the method for lithium ion battery health status estimation:
A, battery module is installed in the lithium ion battery health status estimating system, it is connected respectively with described single-chip microcomputer central control module and battery module;
B, described single-chip microcomputer central control module are controlled described alternating-current pulse output module to the alternating-current pulse signal of described battery module output 5963Hz and 3Hz;
C, described battery module send response and these response signal biography data are transported to the single-chip microcomputer central control module for the alternating-current pulse signal of B step, described single-chip microcomputer central control module receives this response signal data and analyzes the response signal that 5963Hz records, and obtains the estimated value of cell health state by processing;
Result after D, described single-chip microcomputer central control module will be processed be sent to the described display module that it is connected on show the estimated value of cell health state.
Use lithium ion battery health status estimating system of the present invention can fast on-line measurement by above-mentioned steps to the method for lithium ion battery health status estimation and is drawn the health status of the true reality of lithium ion battery, and accuracy is high as a result.
Description of drawings
Fig. 1 lithium ion battery health status of the present invention estimating system embodiment synoptic diagram.
The equivalent circuit diagram of Fig. 2 lithium ion battery health status of the present invention estimating system embodiment inside lithium ion cell impedance.
The figure number explanation
1 ... single-chip microcomputer central control module 2 ... the alternating-current pulse output module
3 ... battery module 4 ... display module
Embodiment
Below in conjunction with Fig. 1 to Fig. 2 of accompanying drawing to lithium ion battery health status estimating system of the present invention and use this system that the method for lithium ion battery health status estimation is described in further detail.
Lithium ion battery health status estimating system of the present invention, please refer to Fig. 1 to Fig. 2, the alternating-current pulse output module 2, battery module 3 and the display module 4 that comprise single-chip microcomputer central control module 1, output AC pulse, described single-chip microcomputer central control module 1 is connected with display module with alternating-current pulse output module 2, battery module 3 respectively and is connected, described alternating-current pulse output module 2 be connected battery module 3 and connect, described battery module 3 is lithium-ion-power cell.Like this, during use, the alternating-current pulse signal of 2 pairs of battery modules of single-chip microcomputer central control module 1 control alternating-current pulse output module, 3 output different frequencies, 3 pairs of different alternating-current pulse signals of battery module are made different response signals, these different response signals are sent to single-chip microcomputer central control module 1, and 1 pair of above-mentioned response signal data of single-chip microcomputer central control module receives, analyzes and process the lithium ion battery health status that draws estimation and be sent to display module 4 and shows.Principle of the present invention is: lithium-ion-power cell is battery module 3, and in use, its function is equivalent to an electrolytic cell.When battery module 3 is carried out ac impedance measurement, when the alternating-current pulse of different frequency passed through electrolytic cell (battery module 3), each inner component of electrolytic cell (battery module 3) can produce different responses to alternating current.The symmetrical alternating current electricity is to electrode polarization by a small margin owing to use, and when frequency is enough high, so that per duration semiperiod is very short, and unlikely serious concentration polarization and the surface state of causing changes.And the cathodic process of anodic process alternately appears on electrode, and even measure chief signal officer's time effect in electrolytic cell (battery module 3), the accumulation sexual development of the present stage elephant that also can not cause polarizing.When so the alternating-current pulse electric current of different frequency passes through as the inside lithium ion cell of battery module 3, between plus plate current-collecting body and the active material, between active material and the electrolytic solution, between electrolytic solution and the barrier film, between electrolytic solution and the negative material, between negative material and the negative current collector, can record different responses, be delivered to single-chip microcomputer central control module 1 according to different response signals thus, single-chip microcomputer central control module 1 is analyzed each the component impedance that draws inside battery.Lithium ion battery (battery module 3) internal driving analysis draws its simplified electrical circuit diagram such as Fig. 2 institute, and Rct represents charge transfer resistance in Fig. 2, is directly proportional with the negative of electron transfer speed.Transfer velocity is faster, and resistance is less.Cd represents electric double layer capacitance.Rs represents solution resistance.Zw represents the Warburg impedance, the resistance of mass transport process restriction.Draw by a large amount of experimental datas, lithium-ion-power cell (battery module 3) can be calculated by the variation of Rct and Rs the extent of deterioration of lithium-ion-power cell in ageing process.Experimental data shows, when the alternating-current pulse signal of output 5963Hz, can obtain the Rs of lithium-ion-power cell, and when the alternating-current pulse signal of output 3Hz, the value that resulting value deducts Rs can obtain the value of Rct.Therefore with respect to the advantage of prior art be simple in structure, specially for lithium ion battery, exactly online Fast Measurement lithium-ion-power cell actual inside resistance and inner each chemical composition impedance and determine the lithium ion battery actual state.
Concrete analysis the present invention has following advantage and effect with respect to prior art: infiltrating into inside lithium ion cell, is the start with health status of estimation lithium ion battery of the bottom Electrochemistry Information of lithium ion battery from battery module 3.Existing internal resistance of cell metering system, the just resistance of inside battery conductor that obtains can not obtain the impedance of each chemical composition of inside battery.The present invention exports different alternating-current pulse signals by the metering system of AC impedance, analyzes the impedance magnitude of each chemical composition of inside draw battery, makes value that estimating system estimates more near the battery in the real work, more meets battery reality.
Lithium ion battery health status estimating system of the present invention please refer to Fig. 1 to Fig. 2, specifically can be described alternating-current pulse output module 2 is exported respectively two kinds of frequencies to connected battery module 3 alternating-current pulse signal in front on the basis of technical scheme.Such advantage is: the alternating-current pulse signal of two different frequencies of output filters out Rs and Rct as the parameter of estimation, the accuracy of assurance system estimation lithium ion battery health status.Obtain a large amount of analysis of experimental data by the inside battery chemical system test to complexity, pick out these two eigenwerts of Rs and Rct as the parameter of lithium-ion-power cell health status estimation.By formula, make that two parameters of Rs parameter and Rct are separate in estimation process to influence each other again, will estimate that the result is divided into 5 grades, make the estimation result more accurate, reduce estimation error.Further preferred technical scheme is described alternating-current pulse output module 2 is exported respectively 5963Hz and 3Hz frequency to connected battery module 3 alternating-current pulse signal.High-frequency alternating-current pulse signal, what obtain is the electronics transfer impedance of lithium ion battery, low-frequency alternating-current pulse signal, what obtain is the mass transfer impedance of lithium ion battery, draws through the experimental data statistics, in the high frequency of 5963Hz, the starting point of Rs can be obtained, in the low frequency of 3Hz, the node of the value of Rs+Rct can be obtained, after the data processing, can obtain the value of Rct.Further preferred technical scheme is: described single-chip microcomputer central control module 1 comprises the data receiver part, the data analysis part, data processing section and transmitting portion as a result, described data receiver part is connected with battery module 3 and is used for receiving the response signal data that battery module 3 is made for the alternating-current pulse signal of alternating-current pulse output, described data analysis part partly is connected the response signal data that receives for analysis with described data receiver, described data processing section and described data analysis partly are connected for processing analyzing rear response signal data, and described as a result transmitting portion is connected with display module with data processing section respectively and is connected the result who is used for data are processed and is presented at display module 4.Like this, assurance single-chip microcomputer central control module 1 can be accepted, analyze and process the response signal data that battery module 3 is transported to, and guarantees to estimate tested lithium ion battery health status.Further preferred technical scheme is that the above alternating-current pulse output module 2 of basis of in front technical scheme comprises high speed D/A data-switching part, high-frequency operational amplifier and Technitron, described high frequency is that frequency is more than 6MHz, described high speed D/A data-switching part is connected with described single-chip microcomputer central control module 1 output terminal, and described high speed D/A data-switching part is connected with Technitron with high-frequency operational amplifier respectively.Such advantage is battery module 3 to be exported in real time the alternating-current pulse of different frequency by single-chip microcomputer central control module 1 control DA data-switching part, response signal input single-chip microcomputer central control module 1 carries out real-time estimation, the estimated value real-time Transmission that obtains is shown to display module 4, realize real-time online estimation and the Quick Measurement of lithium ion battery health status.Can also be that described single-chip microcomputer central control module 1 is PIC high frequency monolithic machine, described battery module 3 partly be connected with the data receiver of described single-chip microcomputer central control module 1.PIC high frequency monolithic machine can be controlled high speed D/A, and the high frequency response signal that test obtains is carried out timely data processing, prevents data and processes hysteresis, and other high frequency series monolithics can use equally.Using the advantage of PIC high frequency monolithic machine is that data processing speed is fast, and the control high speed D/A is fully no problem.In addition, can also be that described display module 4 is LCDs or LED light, described display module 4 is connected with the as a result transmitting portion of described single-chip microcomputer central control module 1.
The present invention also protects and uses above-mentioned lithium ion battery health status estimating system to the method for lithium ion battery health status estimation, may further comprise the steps:
A, battery module 3 is installed in the lithium ion battery health status estimating system, they are connected with battery module with described single-chip microcomputer central control module 1 are connected respectively;
B, the described alternating-current pulse output module 2 of described single-chip microcomputer central control module 1 control are exported the alternating-current pulse signal of 5963Hz and 3Hz to described battery module 3;
C, described battery module 3 send response and these response signal biography data are transported to single-chip microcomputer central control module 1 for the alternating-current pulse signal of B step, described single-chip microcomputer central control module 1 receives this response signal data and analyzes the response signal that 5963Hz records, and obtains the estimated value of cell health state by processing;
Result after D, described single-chip microcomputer central control module 1 will be processed be sent to the described display module that it is connected 4 on show the estimated value of cell health state.
Use lithium ion battery health status estimating system of the present invention can fast on-line measurement by above-mentioned steps to the method for lithium ion battery health status estimation and is drawn the health status of the true reality of lithium ion battery, and accuracy is high as a result.
Use lithium ion battery health status estimating system of the present invention is to the method for lithium ion battery health status estimation, can also be that the data analysis and process process is in the described C step: the response signal that 5963Hz records in front on the basis of technical scheme, obtain the Rs impedance of inside lithium ion cell by processing, the value that the response signal that 3Hz records, the value that obtains by processing deduct Rs obtains the Rct of inside lithium ion cell.Use the Rs value that records as the initial value of lithium-ion-power cell Rs the lithium-ion-power cell for the first time installation of dispatching from the factory, use Rs
JustExpression uses the Rct value that records as the Rct initial value of lithium-ion-power cell the lithium-ion-power cell for the first time installation of dispatching from the factory, and uses Rct
JustExpression.Then use following computing formula to calculate:
X represents the estimation numerical value of cell health state, 0-1 represents that cell health state is outstanding, 1-2 represents that cell health state is good, 2-3 represents that cell health state is medium, and 3-4 represents that cell health state is poor, and slight damage has occured, 4-5 represents that cell health state is relatively poor, moderate has occured damaged, the expression cell health state is very poor more than 5, needs to change battery.
Use lithium ion battery health status estimating system of the present invention to the advantage of the method for lithium ion battery health status estimation is:
(1) infiltrating into inside lithium ion cell, is the start with health status of estimation lithium ion battery of the bottom Electrochemistry Information of lithium ion battery from battery module 3.Existing internal resistance of cell metering system, the just resistance of inside battery conductor that obtains can not obtain the impedance of each chemical composition of inside battery.By the metering system of AC impedance, export different alternating-current pulse signals, analyze the impedance magnitude of each chemical composition of inside that draws battery, make the estimation mode more near the battery in the real work, more meet battery reality.
(2) the alternating-current pulse signal of two different frequencies of output filters out Rs and Rct as the parameter of estimation.Obtain a large amount of analysis of experimental data by the inside battery chemical system test to complexity, pick out these two eigenwerts of Rs and Rct as the parameter of lithium-ion-power cell health status estimation.By
Formula makes that two parameters of Rs parameter and Rct are separate in estimation process to influence each other again, will estimate that the result is divided into 5 grades, makes the estimation result more accurate, reduces estimation error.
(3) estimation of the real-time online of lithium-ion-power cell health status and Quick Measurement.Battery module 3 is exported in real time the alternating-current pulse of different frequency by single-chip microcomputer central control module 1 control DA data-switching, also this response signal is delivered to single-chip microcomputer central control module 1 carries out real-time estimation to battery module 3 output response signals, the estimated value real-time Transmission that obtains is shown to display module 4, realize real-time online estimation and the Quick Measurement of health status.
Above-mentionedly only several specific embodiments among the present invention are illustrated; but can not be as protection scope of the present invention; every equivalence variation of having done according to the design spirit among the present invention or modification or equal proportion zoom in or out etc., all should think to fall into protection scope of the present invention.
Claims (9)
1. lithium ion battery health status estimating system, it is characterized in that: the alternating-current pulse output module, battery module and the display module that comprise single-chip microcomputer central control module, output AC pulse, described single-chip microcomputer central control module is connected with alternating-current pulse output module, battery module and display module respectively, described alternating-current pulse output module be connected battery module and connect, described battery module is lithium-ion-power cell.
2. lithium ion battery health status estimating system according to claim 1 is characterized in that: described alternating-current pulse output module is respectively to the alternating-current pulse signal of two kinds of frequencies of connected battery module output.
3. lithium ion battery health status estimating system according to claim 2 is characterized in that: described alternating-current pulse output module is respectively to the alternating-current pulse signal of connected battery module output 5963Hz and 3Hz frequency.
4. lithium ion battery health status estimating system according to claim 3, it is characterized in that: described single-chip microcomputer central control module comprises the data receiver part, the data analysis part, data processing section and transmitting portion as a result, described data receiver part is connected with battery module and is used for receiving the response signal data that battery module is made for the alternating-current pulse signal of alternating-current pulse output, described data analysis part partly is connected the response signal data that receives for analysis with described data receiver, described data processing section partly is connected for processing analyzing rear response signal data with described data analysis, and described as a result transmitting portion is connected the result who is used for data are processed with data processing section respectively and is presented at display module with display module.
5. lithium ion battery health status estimating system according to claim 4, it is characterized in that: described alternating-current pulse output module comprises high speed D/A data-switching part, high-frequency operational amplifier and Technitron, described high frequency is that frequency is more than 6MHz, described high speed D/A data-switching part is connected with described single-chip microcomputer central control module output terminal, and described high speed D/A data-switching part is connected with Technitron with high-frequency operational amplifier respectively.
6. lithium ion battery health status estimating system according to claim 4, it is characterized in that: described single-chip microcomputer central control module is the high single-frequency sheet of PIC machine, and described battery module partly is connected with the data receiver of described single-chip microcomputer central control module.
7. lithium ion battery health status estimating system according to claim 4, it is characterized in that: described display module is LCDs or LED light, described display module is connected with the as a result transmitting portion of described single-chip microcomputer central control module.
8. right to use requires the described lithium ion battery health status of 1 to 7 any claim estimating system to the method for lithium ion battery health status estimation, it is characterized in that: may further comprise the steps:
A, battery module is installed in the lithium ion battery health status estimating system, it is connected respectively with described single-chip microcomputer central control module and battery module;
B, described single-chip microcomputer central control module are controlled described alternating-current pulse output module to the alternating-current pulse signal of described battery module output 5963Hz and 3Hz;
C, described battery module send response and these response signal biography data are transported to the single-chip microcomputer central control module for the alternating-current pulse signal of B step, described single-chip microcomputer central control module receives this response signal data and analyzes the response signal that 5963Hz records, and obtains the estimated value of cell health state by processing;
Result after D, described single-chip microcomputer central control module will be processed be sent to the described display module that it is connected on show the estimated value of cell health state.
9. use lithium ion battery health status estimating system according to claim 8 is to the method for lithium ion battery health status estimation, it is characterized in that: the data analysis and process process is in the described C step: the response signal that 5963Hz records, obtain the Rs impedance of inside lithium ion cell by processing, the value that the response signal that 3Hz records, the value that obtains by processing deduct Rs obtains the Rct of inside lithium ion cell.Use the Rs value that records as the initial value of lithium-ion-power cell Rs the lithium-ion-power cell for the first time installation of dispatching from the factory, use Rs
JustExpression uses the Rct value that records as the Rct initial value of lithium-ion-power cell the lithium-ion-power cell for the first time installation of dispatching from the factory, and uses Rct
JustExpression.Then use following computing formula to calculate:
X represents the estimation numerical value of cell health state, 0-1 represents that cell health state is outstanding, 1-2 represents that cell health state is good, 2-3 represents that cell health state is medium, and 3-4 represents that cell health state is poor, and slight damage has occured, 4-5 represents that cell health state is relatively poor, moderate has occured damaged, the expression cell health state is very poor more than 5, needs to change battery.
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| CN103293483A (en) * | 2013-05-24 | 2013-09-11 | 杭州电子科技大学 | Lithium battery health condition estimation method based on internal resistance measurement |
| CN103344921A (en) * | 2013-07-08 | 2013-10-09 | 华南师范大学 | Lithium-ion power battery health state evaluating system and method |
| CN103487762A (en) * | 2013-09-30 | 2014-01-01 | 国家电网公司 | Screening method for lithium ion batteries |
| CN103558556A (en) * | 2013-10-31 | 2014-02-05 | 重庆长安汽车股份有限公司 | Power battery SOH estimation method |
| CN103869256A (en) * | 2014-03-27 | 2014-06-18 | 华南师范大学 | Method for estimating SOH of power lithium ion battery based on alternating current impedance test |
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