CN107611505B - Method and system for judging health degree of secondary storage battery - Google Patents
Method and system for judging health degree of secondary storage battery Download PDFInfo
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Abstract
The invention relates to a method for judging the health degree of a secondary battery and a system thereof, wherein the method comprises the steps of obtaining the relevant information of the secondary battery; acquiring a charging characteristic interval of the storage battery according to the related information; judging whether the charging voltage of the storage battery is equal to the starting point value of the charging characteristic interval or not; if yes, acquiring the charging capacity or charging energy of the storage battery; judging whether the charging voltage of the storage battery is equal to the end value of the charging characteristic interval or not; and if so, acquiring the aging degree of the storage battery according to the charging capacity or the charging energy. According to the invention, the charging characteristic interval is determined, the charging electric quantity or energy of the storage battery in the charging characteristic interval is obtained, the change rate of the charging electric quantity or energy relative to the reference standard value is obtained, the aging degree of the storage battery is obtained, the problem of judging the aging degree of the storage battery is solved, the requirement on the judging condition is not high, the temperature is taken into account, the difficulty of commercial application and the judging difficulty are reduced, and the current aging degree of the storage battery is convenient to detect.
Description
Technical Field
The present invention relates to a secondary battery, and more particularly, to a method and system for determining the health of a secondary battery.
Background
In recent years, the dependence on energy has changed, and the trend is gradually moving from petrochemical fuels to electric power, and the most critical factor causing the transition is the development of secondary batteries, since the 1990 s, the commercialization of lithium-based secondary batteries has been carried out, various battery products are continuously proposed, and with the development of the times, new electrode materials have made secondary batteries with higher energy density and have longer life cycle, but even then, the decline of the battery performance still brings great application troubles, and the aged batteries, besides the reduction of the energy storage density, are more serious to estimate the storage State (State of Charge), so that the battery management system has serious misjudgment on the batteries, affects the user experience, and even causes safety problems.
For the storage battery without the history record, it is difficult to know the current aging degree, and the most effective way is a discharge test method, which needs to have reference value under offline and special experimental conditions, which directly affects the practical commercial application. Other aging evaluation methods, such as the internal resistance method, also have the disadvantage that the battery state fluctuates greatly, and the difference of the storage state or the temperature affects the performance of the internal resistance, so that the relationship between the internal resistance and the aging degree is highly nonlinear, and the difficulty of judgment is increased.
Therefore, it is necessary to design a method for determining the health degree of a secondary battery, so as to solve the problem of determining the aging degree of the secondary battery, reduce the difficulty of commercial application and determination, and facilitate detection of the current aging degree of the secondary battery.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a method and a system for judging the health degree of a secondary battery.
In order to achieve the purpose, the invention adopts the following technical scheme: a method of determining a degree of health of a secondary battery, the method comprising:
acquiring relevant information of a storage battery;
acquiring a charging characteristic interval of the storage battery according to the related information;
judging whether the charging voltage of the storage battery is equal to the starting point value of the charging characteristic interval or not;
if yes, acquiring the charging capacity or charging energy of the storage battery;
judging whether the charging voltage of the storage battery is equal to the end value of the charging characteristic interval or not;
and if so, acquiring the aging degree of the storage battery according to the charging capacity or the charging energy.
The further technical scheme is as follows: the step of obtaining the relevant information of the storage battery comprises the following specific steps:
acquiring material type information and rated capacitance or rated energy of the storage battery;
and acquiring the current temperature information, the charging mode and the charging current or the charging power of the storage battery.
The further technical scheme is as follows: obtaining the charge capacity of the accumulator orStep of charging energy, in particular by
Obtaining the charge capacity of the accumulator, or using
Acquiring charging energy of a storage battery; wherein I represents a charging current; symbol P represents charging power; the symbol Δ t represents the sensor sampling time interval.
The further technical scheme is as follows: the step of obtaining the aging degree of the storage battery according to the charging capacity or the charging energy comprises the following specific steps:
acquiring a set theoretical initial charging capacity or theoretical initial charging energy;
acquiring the ratio of the charging capacity to the theoretical initial charging capacity or the ratio of the charging energy to the theoretical initial charging energy;
and multiplying the ratio by a setting coefficient of the previous stage to obtain the percentage, thereby forming the aging degree value of the storage battery.
The invention also provides a system for judging the health degree of the secondary storage battery, which comprises an information acquisition unit, an interval acquisition unit, a starting point judgment unit, a charging amount acquisition unit, an end point judgment unit and an aging degree acquisition unit;
the information acquisition unit is used for acquiring relevant information of the storage battery;
the interval acquisition unit is used for acquiring a charging characteristic interval of the storage battery according to the related information;
the starting point judging unit is used for judging whether the charging voltage of the storage battery is equal to the starting point value of the charging characteristic interval or not;
the charging amount acquisition unit is used for acquiring the charging capacity or the charging energy of the storage battery if the charging amount acquisition unit is positive;
the terminal point judging unit is used for judging whether the charging voltage of the storage battery is equal to the terminal point value of the charging characteristic interval or not;
and the aging degree acquisition unit is used for acquiring the aging degree of the storage battery according to the charging capacity or the charging energy if the charging capacity or the charging energy is the same as the charging capacity.
The further technical scheme is as follows: the information acquisition unit comprises a basic information acquisition module and a current information acquisition module;
the basic information acquisition module is used for acquiring material type information and rated capacitance or rated energy of the storage battery;
the current information acquisition module is used for acquiring current temperature information, a charging mode and charging current or charging power of the storage battery.
The further technical scheme is as follows: the aging degree acquisition unit comprises an initial value acquisition module, a ratio acquisition module and a degree value acquisition module;
the initial value acquisition module is used for acquiring set theoretical initial charging capacity or theoretical initial charging energy;
the ratio acquisition module is used for acquiring the ratio of the charging capacity to the theoretical initial charging capacity or the ratio of the charging energy to the theoretical initial charging energy;
and the degree value acquisition module is used for multiplying the ratio by the setting coefficient of the previous stage to acquire the percentage and form the aging degree value of the storage battery.
Compared with the prior art, the invention has the beneficial effects that: the method for judging the health degree of the secondary storage battery determines a charging characteristic interval by acquiring the material type, the rated capacitance or the rated energy, the current temperature, the charging mode and the charging current or the charging power of the storage battery, acquires the charging electric quantity or the energy of the storage battery in the charging characteristic interval, and obtains the aging degree of the storage battery according to the change rate of the charging electric quantity or the energy relative to a reference standard value, thereby realizing the judgment of the aging degree of the storage battery, having low requirements on judgment conditions, taking the temperature into account, reducing the difficulty of commercial application and the judgment difficulty, and being convenient for detecting the current aging degree of the storage battery.
The invention is further described below with reference to the accompanying drawings and specific embodiments.
Drawings
Fig. 1 is a flowchart of a method for determining a health degree of a secondary battery according to an embodiment of the present invention;
fig. 2 is a flowchart for acquiring information related to a storage battery according to an embodiment of the present invention;
fig. 3 is a flowchart for obtaining the aging degree of the storage battery according to the charging capacity or the charging energy according to an embodiment of the present invention;
fig. 4 is a block diagram of a system for determining the health of a secondary battery according to an embodiment of the present invention;
fig. 5 is a block diagram of an information obtaining unit according to an embodiment of the present invention;
fig. 6 is a block diagram of an aging degree obtaining unit according to an embodiment of the present invention;
FIG. 7 is a graph of capacity fade for a battery cycling performance test provided by an embodiment of the present invention;
FIG. 8 is a graph comparing the results of a battery cycle performance test at a temperature of 20 ℃ provided by an embodiment of the present invention;
FIG. 9 is a comparison graph of the results of a battery cycle performance test at a temperature of 40 ℃ provided by an embodiment of the present invention;
fig. 10 is a table of characteristic interval test values of a brand new battery according to an embodiment of the present invention.
Detailed Description
In order to more fully understand the technical content of the present invention, the technical solution of the present invention will be further described and illustrated with reference to the following specific embodiments, but not limited thereto.
As shown in fig. 1 to 10, the method for determining the health degree of a secondary battery according to the present embodiment can be applied to secondary battery products, energy storage devices, and transportation tools driven by electric power of the secondary battery, so as to solve the problem of determining the aging degree of the secondary battery, reduce the difficulty of commercial application and the difficulty of determination, and facilitate detecting the current aging degree of the secondary battery.
As shown in fig. 1, the present embodiment provides a method for determining the degree of health of a secondary battery, the method including:
s1, acquiring relevant information of the storage battery;
s2, acquiring a charging characteristic interval of the storage battery according to the related information;
s3, judging whether the charging voltage of the storage battery is equal to the starting point value of the charging characteristic interval or not;
s4, if yes, acquiring the charging capacity or charging energy of the storage battery;
s5, judging whether the charging voltage of the storage battery is equal to the end value of the charging characteristic interval or not;
and S6, if yes, acquiring the aging degree of the storage battery according to the charging capacity or the charging energy.
Further, after the step of determining whether the charging voltage of the storage battery is equal to the starting point of the charging characteristic interval in the step of S3, the method further includes:
if not, S31, continue to wait, and return to the step S3.
After the step of S5 and the step of determining whether the charging voltage of the storage battery is equal to the end value of the charging characteristic interval, the method further includes:
if not, S51, judging whether the charging voltage of the storage battery is in the charging characteristic interval;
if the charging voltage of the storage battery is within the charging characteristic interval, returning to the step S4;
and if the charging voltage of the storage battery is not in the charging characteristic interval, entering an ending step.
Further, the step of obtaining the information related to the storage battery in step S1 includes the following specific steps:
s11, acquiring the material type information and rated capacitance or rated energy of the storage battery;
and S12, acquiring the current temperature information, the charging mode and the charging current or charging power of the storage battery.
For the step S11, the type of the material of the storage battery is obtained, in order to determine the charging characteristic intervals of the storage battery, the charging characteristic intervals of the storage batteries with different materials are different, and the charging characteristic interval of the storage battery with the material NCM/C is 4.05-4.18 Volt under the charging power of 1 Erate; under the charging power of 0.5Erate, the charging characteristic interval of the storage battery made of the NCA/C material is 3.80-4.00 Volt; under the charging power of 0.5Erate, the charging characteristic interval of the storage battery made of the LFP/C material is 3.53-3.60 Volt; the charging characteristic intervals of the storage batteries made of other materials need to be tested, and the test results are analyzed and obtained. The acquisition of rated capacity or rated energy is to obtain the reference standard value of the charging characteristic interval of the storage battery of the type.
In the step S12, since the temperature has an influence on the degree of degradation of the secondary battery, it is necessary to acquire current temperature information to correct the reference standard value in temperature, thereby improving the accuracy of determination. And different charging modes can affect the voltage change of the charging characteristic interval, and the voltage change of the charging characteristic interval can correspond to different reference standard values. Determining the charging mode may determine a reference standard value. And acquiring the charging current or the charging power, and counting the capacitance or the electric energy charged in the charging characteristic interval.
For the above step S2, the charging characteristic interval selection criteria are as follows: under the test conditions of constant environmental temperature, constant power or constant current charging, a continuous charging interval is extracted, the secondary derivative value of the voltage of the interval to the electric capacity or the electric energy is less than or equal to phi, the primary derivative value is greater than or equal to phi, the variation of the voltage is greater than or equal to kappa, wherein the symbols phi, phi and kappa represent a set constant, and the continuous interval meeting the conditions is preferably used as the charging characteristic interval of the storage battery.
Furthermore, in the step S3, the aging degree of the secondary battery can be obtained only when the charging voltage is within the charging characteristic interval, which can be expected by the secondary battery during the charging process.
In addition, for the above step S4, the step of acquiring the charge capacity or charge energy of the battery is specifically adopted
Obtaining the charge capacity of the accumulator, or using
Acquiring charging energy of a storage battery; wherein I represents a charging current; symbol P represents charging power; the symbol Δ t represents the sensor sampling time interval.
For the above step S5, the charging capacity or the charging energy of the charging voltage changing from the starting point value of the charging characteristic interval to the ending point value of the charging characteristic interval is obtained, and the health degree of the secondary battery is obtained according to the charging capacity or the charging energy in the process.
Further, the step of obtaining the aging degree of the battery according to the charging capacity or the charging energy in the step of S6 includes the following specific steps:
s61, acquiring the set theoretical initial charging capacity or theoretical initial charging energy;
s62, acquiring the ratio of the charging capacity to the theoretical initial charging capacity or the ratio of the charging energy to the theoretical initial charging energy;
and S63, multiplying the ratio by the setting coefficient of the previous stage to obtain the percentage, and forming the aging degree value of the storage battery.
In the step S61, the theoretical initial charging capacity or the theoretical initial charging energy, that is, the reference standard value, is set, specifically, a database of theoretical values is established by using experimental data and a linear interpolation method, and then the temperature information, the charging current or the power is obtained to search the numerical value corresponding to the database, and the table of the database may refer to fig. 10.
For the above step S62, specifically, during the expected charging process of the secondary battery, the change rate of the voltage with respect to the capacity or energy in a certain charging characteristic interval is measured, and the change rate is compared with the initial value to obtain the aging degree of the secondary battery.
In the step S63, the setting system is a coefficient obtained by a battery cycle performance test, specifically, obtained from fig. 7, 8, and 9.
Such as: positive/negative electrode of accumulatorThe material is NCM/C, the rated capacity is 7.2Ah, the rated energy is 25.92Wh, the charging mode is constant power charging, the power is 25.92W, and the charging is equivalent to 1Erate charging. The charging characteristic range of this material type of battery is 4.05 to 4.18 Volt. Recording the energy change of the storage battery in the charging characteristic interval during each charging and discharging cycle, calling a theoretical initial value for comparison, and multiplying the ratio by an experimental coefficient to represent the aging degree of the storage battery. The calculation formula is as follows:
wherein symbol HnRepresents the current percent aging; gamma is an empirical weighting number, and the storage batteries of different materials have different weighting values, and the values of the weighting values are all between 0 and 2; w0(T, E) are reference standard values, namely charging characteristic interval test values of the brand-new battery at T temperature and E power during charging, namely electric energy change test results of the brand-new battery in a characteristic charging interval, as shown in FIG. 10; wnThe measured charging capacity or charging energy is used. The current aging degree of the battery can be obtained by the calculation formula.
The method for judging the health degree of the secondary storage battery determines the charging characteristic interval by acquiring the material type, the rated capacitance or the rated energy, the current temperature, the charging mode and the charging current or the charging power of the storage battery, acquires the charging electric quantity or the energy of the storage battery in the charging characteristic interval, and obtains the aging degree of the storage battery according to the change rate of the charging electric quantity or the energy relative to a reference standard value, thereby realizing the judgment of the aging degree of the storage battery, having low requirements on judgment conditions, taking the temperature into account, reducing the difficulty of commercial application and the judgment difficulty, and being convenient for detecting the current aging degree of the storage battery.
As shown in fig. 4, the present embodiment also provides a system for determining the degree of health of a secondary battery, which includes an information acquisition unit 1, a section acquisition unit 2, a starting point determination unit 3, a charge amount acquisition unit 4, an end point determination unit 5, and an aging degree acquisition unit 6.
An information acquisition unit 1 for acquiring information about the storage battery.
And the interval acquisition unit 2 is used for acquiring the charging characteristic interval of the storage battery according to the related information. The selection criterion of the charging characteristic interval is as follows: under the test conditions of constant environmental temperature and constant power or constant current charging, a continuous charging interval is extracted, the secondary derivative value of the voltage to the electric capacity or the electric energy in the interval is less than or equal to phi, the primary derivative value is greater than or equal to phi, and the variation of the voltage is greater than or equal to kappa, wherein the symbols phi, phi and kappa represent a set constant, and the continuous interval meeting the conditions is preferably used as the charging characteristic interval of the storage battery.
A starting point judging unit 3 for judging whether the charging voltage of the storage battery is equal to the starting point value of the charging characteristic interval;
a charge amount acquisition unit 4 for acquiring a charge capacity or a charge energy of the storage battery if yes;
an end point judging unit 5 for judging whether the charging voltage of the storage battery is equal to an end point value of the charging characteristic interval;
and an aging degree acquiring unit 6, configured to acquire the aging degree of the storage battery according to the charging capacity or the charging energy if the charging state is positive.
In addition, the information acquiring unit 1 includes a basic information acquiring module 11 and a current information acquiring module 12.
A basic information obtaining module 11, configured to obtain material type information and rated capacitance or rated energy of the storage battery;
and the current information acquisition module 12 is configured to acquire current temperature information, a charging mode, and a charging current or charging power of the storage battery.
The basic information acquisition module 11 acquires the material types of the storage battery, so as to determine the charging characteristic intervals of the storage battery, the charging characteristic intervals of the storage batteries made of different materials are different, and the charging characteristic interval of the storage battery made of NCM/C is 4.05-4.18 Volt under the charging power of 1 ERAte; under the charging power of 0.5Erate, the charging characteristic interval of the storage battery made of the NCA/C material is 3.80-4.00 Volt; under the charging power of 0.5Erate, the charging characteristic interval of the storage battery made of the LFP/C material is 3.53-3.60 Volt; the charging characteristic intervals of the storage batteries made of other materials need to be tested, and the test results are analyzed and obtained. The acquisition of rated capacity or rated energy is to obtain the reference standard value of the charging characteristic interval of the storage battery of the type.
Since the current information acquisition module 12 described above has an influence on the degree of degradation of the secondary battery due to temperature, it is necessary to acquire current temperature information to correct the reference standard value in temperature, thereby improving the accuracy of determination. And different charging modes can affect the voltage change of the charging characteristic interval, and the voltage change of the charging characteristic interval can correspond to different reference standard values. Determining the charging mode may determine a reference standard value. And acquiring the charging current or the charging power, and counting the capacitance or the electric energy charged in the charging characteristic interval.
For the starting point determining unit 3, as long as the charging voltage is within the charging characteristic interval, the expected charging process of the secondary battery can be utilized to obtain the aging degree of the secondary battery.
The charge amount acquisition unit 4 acquires the charge capacity or charge energy of the battery, specifically, by
Obtaining the charge capacity of the accumulator, or using
Acquiring charging energy of a storage battery; wherein I represents a charging current; symbol P represents charging power; the symbol Δ t represents the sensor sampling time interval.
The end point determining unit 5 is specifically configured to obtain the charging capacity or the charging energy of the charging voltage changing from the starting point value of the charging characteristic interval to the end point value of the charging characteristic interval, and obtain the health degree of the secondary battery according to the charging capacity or the charging energy in the process.
Further, the aging degree acquiring unit 6 includes an initial value acquiring module 61, a ratio acquiring module 62, and a degree value acquiring module 63.
An initial value obtaining module 61, configured to obtain a set theoretical initial charging capacity or theoretical initial charging energy. Specifically, a database of theoretical values is established by using experimental data and a linear interpolation method, and then the temperature information, the charging current, or the power is obtained to search a numerical value recorded in the database, and a table of the database may refer to fig. 10.
A ratio obtaining module 62, configured to obtain a ratio of the charging capacity to a theoretical initial charging capacity or a ratio of the charging energy to the theoretical initial charging energy. Specifically, the expected charging process of the secondary battery is utilized to measure the change rate of the voltage relative to the capacity or energy in a certain charging characteristic interval, and the change rate is compared with an initial value to obtain the aging degree of the secondary battery.
And the degree value acquisition module 63 is used for multiplying the ratio by the setting coefficient of the previous stage to acquire the percentage and form the aging degree value of the storage battery. The above setting system is a coefficient obtained from a battery cycle performance test, specifically, obtained from fig. 7, 8, and 9.
Such as: the positive/negative electrode material of the storage battery is NCM/C, the rated capacity is 7.2Ah, the rated energy is 25.92Wh, the charging mode is constant power charging, the power is 25.92W, and the charge is equivalent to 1Erate charge. The charging characteristic range of this material type of battery is 4.05 to 4.18 Volt. Recording the energy change of the storage battery in the charging characteristic interval during each charging and discharging cycle, calling a theoretical initial value for comparison, and multiplying the ratio by an experimental coefficient to represent the aging degree of the storage battery. The calculation formula is as follows:
wherein symbol HnRepresents the current percent aging; gamma is an empirical weighting number, and the storage batteries of different materials have different weighting values, and the values of the weighting values are all between 0 and 2; w0(T, E) are reference standard values, namely charging characteristic interval test values of the brand-new battery in charging at T temperature and E power, namely electric energy change test nodes of the brand-new battery in the charging characteristic intervalFruit, as shown in FIG. 10; wnThe measured charging capacity or charging energy is used. The current aging degree of the battery can be obtained by the calculation formula.
According to the system for judging the health degree of the secondary storage battery, the charging characteristic interval is determined by obtaining the material type, the rated capacitance or the rated energy, the current temperature, the charging mode and the charging current or the charging power of the storage battery, the charging electric quantity or the energy of the storage battery in the charging characteristic interval is obtained, the aging degree of the storage battery is obtained according to the change rate of the charging electric quantity or the energy of the storage battery in the charging characteristic interval relative to the reference standard value, the problem of judging the aging degree of the storage battery is solved, the requirement on the judging condition is not high, the temperature is taken into account, the difficulty of commercial application and the judging difficulty are reduced, and the.
The technical contents of the present invention are further illustrated by the examples only for the convenience of the reader, but the embodiments of the present invention are not limited thereto, and any technical extension or re-creation based on the present invention is protected by the present invention. The protection scope of the invention is subject to the claims.
Claims (3)
1. A method for determining a degree of health of a secondary battery, the method comprising:
acquiring material type information and rated capacitance or rated energy of the storage battery;
acquiring current temperature information, a charging mode and charging current or charging power of a storage battery;
acquiring a charging characteristic interval of the storage battery according to the material type information, the rated capacitance or the rated energy, the current temperature information, the charging mode and the charging current or the charging power of the storage battery;
judging whether the charging voltage of the storage battery is equal to the starting point value of the charging characteristic interval or not;
if yes, acquiring the charging capacity or charging energy of the storage battery;
judging whether the charging voltage of the storage battery is equal to the end value of the charging characteristic interval or not;
if so, acquiring a set theoretical initial charging capacity or theoretical initial charging energy, acquiring a ratio of the charging capacity to the theoretical initial charging capacity or a ratio of the charging energy to the theoretical initial charging energy, and multiplying the ratio by a set coefficient of a previous stage to acquire a percentage to form an aging degree value of the storage battery, wherein the set coefficient of the previous stage is an empirical weighting number for describing the aging degree of the storage battery, and the storage batteries of different materials have different weighting values, and the values of the weighting values are all 0-2.
2. The method for determining the health of a secondary battery as claimed in claim 1, wherein the step of obtaining the charge capacity or charge energy of the secondary battery is performed by using
Obtaining the charge capacity of the accumulator, or using
Acquiring charging energy of a storage battery; wherein I represents a charging current; symbol P represents charging power; the symbol Δ t represents the sensor sampling time interval.
3. A system for determining the health degree of a secondary battery is characterized by comprising an information acquisition unit, a section acquisition unit, a starting point determination unit, a charge amount acquisition unit, an end point determination unit and an aging degree acquisition unit;
the information acquisition unit is used for acquiring relevant information of the storage battery and comprises a basic information acquisition module and a current information acquisition module, wherein the basic information acquisition module is used for acquiring material type information and rated capacitance or rated energy of the storage battery; the current information acquisition module is used for acquiring current temperature information, a charging mode and charging current or charging power of the storage battery;
the interval acquisition unit is used for acquiring a charging characteristic interval of the storage battery according to the material type information, the rated capacitance or the rated energy, the current temperature information, the charging mode and the charging current or the charging power of the storage battery;
the starting point judging unit is used for judging whether the charging voltage of the storage battery is equal to the starting point value of the charging characteristic interval or not;
the charging amount acquisition unit is used for acquiring the charging capacity or the charging energy of the storage battery if the charging amount acquisition unit is positive;
the terminal point judging unit is used for judging whether the charging voltage of the storage battery is equal to the terminal point value of the charging characteristic interval or not;
the aging degree obtaining unit comprises an initial value obtaining module, a ratio obtaining module and a degree value obtaining module, and is used for obtaining the set theoretical initial charging capacity or theoretical initial charging energy by the initial value obtaining module if the aging degree obtaining unit is used for obtaining the set theoretical initial charging capacity or theoretical initial charging energy by the initial value obtaining module; the ratio acquisition module acquires the ratio of the charging capacity to the theoretical initial charging capacity or the ratio of the charging energy to the theoretical initial charging energy; the degree value acquisition module multiplies the ratio by a setting coefficient of the previous stage to acquire the percentage to form an aging degree value of the storage battery, wherein the setting coefficient of the previous stage is an empirical weighting number for describing the aging degree of the storage battery, and the storage batteries of different materials have different weighting values, and the values of the weighting values are all 0-2.
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| CN113960480A (en) * | 2021-09-10 | 2022-01-21 | 奇瑞商用车（安徽）有限公司 | Power battery SOH estimation method |
| CN114062953B (en) * | 2021-10-26 | 2024-02-13 | 三一汽车起重机械有限公司 | Method and device for determining health state of storage battery and working machine |
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| CN107064818A (en) * | 2017-04-26 | 2017-08-18 | 广州汽车集团股份有限公司 | Battery pack SOH evaluation methods and system |
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