CN110927586A - Battery health degree calculation method - Google Patents
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- CN110927586A CN110927586A CN201811025921.8A CN201811025921A CN110927586A CN 110927586 A CN110927586 A CN 110927586A CN 201811025921 A CN201811025921 A CN 201811025921A CN 110927586 A CN110927586 A CN 110927586A
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Abstract
The invention provides a method for calculating the health degree of a battery, which comprises the following steps: when the battery to be tested is in a discharging state, measuring the voltage value of the battery to be tested, stopping discharging when the battery to be tested is discharged to the minimum preset voltage value, and recording the available capacity of the battery to be tested as a first capacity value; when the battery to be tested is charged, measuring the voltage value of the battery to be tested and calculating the available capacity of the battery to be tested in real time, stopping charging when the battery to be tested is charged to the maximum preset voltage value, and recording the available capacity of the battery to be tested as a second capacity value; and calculating the health degree of the battery to be tested according to the second capacity value and the rated capacity value of the battery to be tested by combining the current temperature condition of the battery to be tested. The invention can calculate the capacity in the charging process as the current capacity of the battery to be measured and calculate the SOH value of the battery to be measured. The method is an on-line, stable, reliable and practical calculation method suitable for the electric automobile, and ensures that parameters in the calculation process are available in real time.
Description
Technical Field
The invention relates to the field of battery detection, in particular to a battery health degree calculation method.
Background
The health degree of the battery is one of important indexes for measuring the service life of the battery and is also a necessary prerequisite for realizing other functions of the battery system. The SOH is used as an internal parameter of the battery system, cannot be directly measured and obtained, and can be estimated only through the relationship among other measurable parameters (such as voltage, current, temperature, internal resistance and the like), and the parameters present a nonlinear dynamic relationship, so that the estimation difficulty is high. The performance is particularly obvious in complex electric automobile working conditions. The SOH estimation algorithm researched at present has too many reference influence factors, high algorithm complexity, great difficulty in engineering application realization and low practicability.
Accordingly, the present invention provides a battery health calculation method.
Disclosure of Invention
In order to solve the above problems, the present invention provides a battery health degree calculation method, including the steps of:
when the battery to be tested is in a discharging state, measuring the voltage value of the battery to be tested, stopping discharging when the battery to be tested is discharged to the minimum preset voltage value, and recording the available capacity of the battery to be tested as a first capacity value;
when the battery to be tested is charged, measuring the voltage value of the battery to be tested and calculating the available capacity of the battery to be tested in real time, stopping charging when the battery to be tested is charged to the maximum preset voltage value, and recording the available capacity of the battery to be tested as a second capacity value;
and calculating the health degree of the battery to be tested according to the second capacity value and the rated capacity value of the battery to be tested by combining the current temperature condition of the battery to be tested.
According to an embodiment of the present invention, in the step of measuring the voltage value of the battery to be tested and calculating the available capacity of the battery to be tested in real time, the available capacity of the battery to be tested is calculated in real time according to the charging current and the first capacity value.
According to one embodiment of the invention, the available capacity of the battery under test is calculated by the following formula:
wherein Q istRepresenting the available capacity, Q, of the battery under test at time tt0Representing said first capacity value, t0Indicates the start time of charging, I(τ)Representing the charging current.
According to an embodiment of the present invention, the step of calculating the health degree of the battery to be tested according to the second capacity value and the rated capacity value of the battery to be tested in combination with the current temperature condition of the battery to be tested further includes the following steps:
measuring the current temperature of the battery to be measured to obtain a weighting proportion coefficient corresponding to the current temperature;
and calculating the health degree of the battery to be tested according to the weighting proportion coefficient, the second capacity value and the rated capacity value of the battery to be tested.
According to one embodiment of the invention, the health of the battery under test is calculated according to the following formula:
wherein SOH represents the health of the battery to be tested, Q2Representing said second capacity value, K representing said weighting factor, Q0And the rated capacity value of the battery to be tested is represented.
According to an embodiment of the present invention, the step of measuring the current temperature of the battery to be measured to obtain the weighting scale factor corresponding to the current temperature further includes the following steps:
measuring the current temperature of the battery to be measured to obtain the current average temperature value of the battery to be measured;
and inquiring a corresponding relation table according to the average temperature value to obtain a weighting proportion coefficient corresponding to the average temperature.
According to an embodiment of the present invention, when the corresponding relationship table does not record the weighting scale coefficient corresponding to the average temperature, the weighting scale coefficient corresponding to the average temperature is calculated according to the weighting scale coefficient corresponding to the temperature value close to the average temperature in the corresponding relationship table.
According to another aspect of the present invention, there is also provided a battery health calculation system, including:
the first capacity value module is used for measuring the voltage value of the battery to be tested when the battery to be tested is in a discharging state, stopping discharging when the battery to be tested discharges to the minimum preset voltage value, and recording the available capacity of the battery to be tested as a first capacity value;
the second capacity value module is used for measuring the voltage value of the battery to be tested and calculating the available capacity of the battery to be tested in real time when the battery to be tested is charged to the maximum preset voltage value, stopping charging when the battery to be tested is charged to the maximum preset voltage value, and recording the available capacity of the battery to be tested as the second capacity value;
and the battery health degree module is used for calculating the health degree of the battery to be tested according to the second capacity value and the rated capacity value of the battery to be tested by combining the current temperature condition of the battery to be tested.
According to one embodiment of the invention, the second capacity value module comprises:
and the available capacity calculating unit is used for calculating the available capacity of the battery to be tested in real time according to the charging current and the first capacity value in the steps of measuring the voltage value of the battery to be tested and calculating the available capacity of the battery to be tested in real time.
According to one embodiment of the invention, the battery health module comprises:
the weighting proportion coefficient unit is used for measuring the current temperature of the battery to be measured to obtain a weighting proportion coefficient corresponding to the current temperature;
and the calculating unit is used for calculating the health degree of the battery to be measured according to the weighting proportion coefficient, the second capacity value and the rated capacity value of the battery to be measured.
The invention uses the minimum cell voltage and the maximum cell voltage as the judgment condition for calculating the charge capacity. The capacity of the battery to be tested in the charging process can be calculated to serve as the current capacity of the battery to be tested, the current average temperature is used for carrying out weighting calculation on the nominal capacity, the ratio of the current capacity of the battery to be tested to the weighted nominal capacity is calculated, and the current SOH value is obtained. The method is an on-line, stable, reliable and practical calculation method suitable for the electric automobile, and ensures that parameters in the calculation process are available in real time.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 shows a flow diagram of a battery health calculation method according to one embodiment of the invention;
FIG. 2 shows a flow chart of a battery health calculation method according to another embodiment of the invention; and
fig. 3 shows a block diagram of a battery health calculation system according to an embodiment of the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, embodiments of the present invention are described in further detail below with reference to the accompanying drawings.
Fig. 1 shows a flow chart of a battery health calculation method according to an embodiment of the present invention.
In general, SOH represents the state of health of a battery, and according to the IEEE1188-1996 standard, when the battery is used for a period of time, the battery should be replaced after the full charge capacity of the battery is less than 80% of the rated capacity of the battery. According to this standard, the definition for SOH can be as follows: the ratio of the dischargeable capacity of the battery to the rated capacity of the new battery under a certain condition:
wherein Q isnowRepresents the maximum capacity that the battery can deliver under the current conditions; qnewIndicating the rated capacity of the new battery.
As shown in fig. 1, in step S101, when the battery under test is in a discharging state, the voltage value of the battery under test is measured, and when the battery under test discharges to the minimum preset voltage value, the discharging is stopped, and the available capacity of the battery under test at this time is recorded as the first capacity value.
In step S102, when the battery to be tested is charged, the voltage value of the battery to be tested is measured and the available capacity of the battery to be tested is calculated in real time, and when the battery to be tested is charged to the maximum preset voltage value, the charging is stopped, and the available capacity of the battery to be tested at this time is recorded as the second capacity value. According to one embodiment of the invention, the available capacity of the battery to be tested is calculated in real time according to the charging current and the first capacity value.
According to one embodiment of the invention, the available capacity of the battery under test is calculated by the following formula:
wherein Q istRepresenting the available capacity, Q, of the battery under test at time tt0Representing a first capacity value, t0Indicates the start time of charging, I(τ)Representing the charging current.
In step S103, the health degree of the battery to be tested is calculated according to the second capacity value and the rated capacity value of the battery to be tested, in combination with the current temperature condition of the battery to be tested.
According to an embodiment of the present invention, in step S103, the current temperature of the battery under test is measured, and a weighting scaling factor corresponding to the current temperature is obtained. And then, calculating the health degree of the battery to be measured according to the weighting proportion coefficient, the second capacity value and the rated capacity value of the battery to be measured.
According to an embodiment of the present invention, in step S103, the health of the battery under test is calculated according to the following formula:
wherein SOH represents the health of the battery to be tested, Q2Representing a second capacity value, K representing a weighting scaling factor, Q0And the rated capacity value of the battery to be tested is represented.
According to an embodiment of the present invention, in step S103, the current temperature of the battery to be tested is measured, and the current average temperature value of the battery to be tested is obtained. Then, according to the average temperature value, a corresponding relation table is inquired to obtain a weighting proportion coefficient corresponding to the average temperature.
According to an embodiment of the present invention, in step S103, when the weighting ratio corresponding to the average temperature is not recorded in the correspondence table, the weighting ratio corresponding to the average temperature is calculated according to the weighting ratio corresponding to the temperature value close to the average temperature in the correspondence table.
Fig. 2 shows a flow chart of a battery health calculation method according to another embodiment of the present invention.
According to an embodiment of the present invention, in the charging process of the battery to be tested, the minimum cell voltage and the maximum cell voltage may be used as the determination conditions to calculate the total capacity of the battery to be tested in the whole process, and the nominal capacity of the battery to be tested is weighted (considering the influence on the nominal capacity under different temperature conditions) in combination with the average temperature in the charging process, and then the current SOH value is calculated. It should be noted that, in the present embodiment, the minimum preset voltage value is set as the minimum cell voltage, and the maximum preset voltage value is set as the maximum cell voltage.
And starting to calculate the charging capacity when the battery to be measured is completely discharged until the minimum cell voltage reaches a set limit value. Under the condition of charging, the total capacity of the current battery to be tested is calculated through integration in real time, whether the cutoff condition of the maximum monomer voltage is met or not is judged, when the cutoff condition is met, the integration is stopped, and the total capacity of the battery system calculated through integration is used as the current available capacity of the battery to be tested. And the nominal capacity of the battery system is weighted using the current average temperature. And calculating the ratio of the current available capacity of the battery to be tested to the weighted nominal capacity to obtain the current SOH value of the battery to be tested.
As shown in fig. 2, in the present invention, the SOH value can be calculated by the following formula:
wherein: SOH is battery health, QtIs the current available capacity, Q, of the battery at time t0K is a weighted scaling factor for the rated capacity of the battery.
And entering a current available capacity calculation process of the battery to be tested when the battery system is completely discharged until the minimum monomer voltage reaches a limit value. The Ah integration method is adopted, such as the following formula:
wherein Q ist0Representing a first capacity value, t0Indicates the start time of charging, I(τ)Representing the charging current.
Performing available capacity integration in real time, judging whether the maximum monomer voltage reaches a cut-off condition in real time, stopping integration when the maximum monomer voltage reaches the cut-off condition, and calculating the obtained QtI.e. the currently available capacity of the battery system.
When available capacity QtAnd after the calculation is finished, acquiring the current average temperature of the battery to be measured, and looking up a table according to the average temperature to acquire the percentage of the nominal capacity, namely the weighting proportion coefficient.
For example: a new set of lithium iron phosphate battery systems has a nominal capacity of 210Ah, 100% percent, measured at room temperature 25 ℃ under standard test conditions. The standard test capacities and percentages at different temperatures are as follows:
TABLE 1 available Capacity at different temperatures
| Temperature/. degree.C | Available capacity/Ah | Percentage of |
| -25 | 191.9933 | 91.21％ |
| -15 | 197.6635 | 93.91％ |
| -10 | 199.8414 | 94.94％ |
| 0 | 203.5244 | 96.69％ |
| 10 | 206.4398 | 98.08％ |
| 20 | 207.3544 | 98.51％ |
| 25 | 210 | 100.00％ |
| 30 | 210.20844 | 99.87％ |
| 35 | 208.60161 | 99.10％ |
| 40 | 208.7766 | 99.19％ |
| 45 | 208.9871 | 99.29％ |
| 50 | 209.2524 | 99.41％ |
| 55 | 209.5449 | 99.55％ |
If the above-mentioned lithium iron phosphate battery is used, the nominal capacity Q0Is a constant value of 210 Ah. If the average temperature obtained from a certain SOH calculation is 40 ℃, the current weighting scaling factor is 0.9919. If the average temperature is 15 ℃, calculating interpolation between 10 ℃ and 20 ℃ to obtain a weighting proportionality coefficient K under the condition of 15 ℃.
Fig. 3 shows a block diagram of a battery health calculation system according to an embodiment of the invention. As shown in fig. 3, the system comprises: a first capacity value module 301, a second capacity value module 302, and a battery health module 303. The first capacity value module 301 includes a first determining unit 3011. The second capacity value module 302 includes a second determination unit 3021 and an available capacity calculation unit 3022. The battery health module 303 includes a weighted scaling factor unit 3031 and a calculation unit 3032.
According to an embodiment of the present invention, the first capacity value module 301 is configured to measure a voltage value of the battery under test when the battery under test is in a discharging state, stop discharging when the battery under test discharges to a minimum preset voltage value, and record an available capacity of the battery under test at this time as the first capacity value. The first determining unit 3011 is configured to determine whether the battery to be tested is discharged to a minimum preset voltage value.
The second capacity value module 302 is configured to measure a voltage value of the battery to be tested and calculate an available capacity of the battery to be tested in real time when the battery to be tested is charged to the maximum preset voltage value, stop charging when the battery to be tested is charged to the maximum preset voltage value, and record the available capacity of the battery to be tested at this time as the second capacity value.
The second determining unit 3021 is configured to determine whether the battery to be tested is charged to the maximum preset voltage value. The available capacity calculating unit 3022 is configured to calculate the available capacity of the battery to be tested in real time according to the charging current and the first capacity value.
According to one embodiment of the invention, the available capacity of the battery under test is calculated by the following formula:
wherein Q istRepresenting the available capacity, Q, of the battery under test at time tt0Representing a first capacity value, t0Indicates the start time of charging, I(τ)Representing the charging current.
The battery health degree module 303 is configured to calculate the health degree of the battery to be tested according to the second capacity value and the rated capacity value of the battery to be tested, in accordance with the current temperature condition of the battery to be tested.
The weighting scale factor unit 3031 is configured to measure a current temperature of the battery to be measured, and obtain a weighting scale factor corresponding to the current temperature. The calculating unit 3032 is configured to calculate the health degree of the battery to be tested according to the weighting proportion coefficient, the second capacity value, and the rated capacity value of the battery to be tested.
According to one embodiment of the invention, the health of the battery under test is calculated according to the following formula:
wherein SOH represents the health of the battery to be tested, Q2Representing a second capacity value, K representing a weighting scaling factor, Q0And the rated capacity value of the battery to be tested is represented.
According to an embodiment of the present invention, the weighted scaling factor unit 3031 is further configured to:
measuring the current temperature of the battery to be measured to obtain the current average temperature value of the battery to be measured;
and according to the average temperature value, inquiring the corresponding relation table to obtain a weighting proportion coefficient corresponding to the average temperature.
The battery health degree calculation method and the battery health degree calculation system provided by the invention utilize the minimum cell voltage and the maximum cell voltage as judgment conditions for calculating the charge capacity. The capacity of the battery to be tested in the charging process can be calculated to serve as the current capacity of the battery to be tested, the current average temperature is used for carrying out weighting calculation on the nominal capacity, the ratio of the current capacity of the battery to be tested to the weighted nominal capacity is calculated, and the current SOH value is obtained. The method is an on-line, stable, reliable and practical calculation method suitable for the electric automobile, and ensures that parameters in the calculation process are available in real time.
It is to be understood that the disclosed embodiments of the invention are not limited to the particular structures, process steps, or materials disclosed herein but are extended to equivalents thereof as would be understood by those ordinarily skilled in the relevant arts. It is also to be understood that the terminology used herein is for the purpose of describing particular embodiments only, and is not intended to be limiting.
Reference in the specification to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the invention. Thus, the appearances of the phrase "one embodiment" or "an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment.
Although the embodiments of the present invention have been described above, the above description is only for the convenience of understanding the present invention, and is not intended to limit the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A method of calculating battery health, the method comprising the steps of:
when the battery to be tested is in a discharging state, measuring the voltage value of the battery to be tested, stopping discharging when the battery to be tested is discharged to the minimum preset voltage value, and recording the available capacity of the battery to be tested as a first capacity value;
when the battery to be tested is charged, measuring the voltage value of the battery to be tested and calculating the available capacity of the battery to be tested in real time, stopping charging when the battery to be tested is charged to the maximum preset voltage value, and recording the available capacity of the battery to be tested as a second capacity value;
and calculating the health degree of the battery to be tested according to the second capacity value and the rated capacity value of the battery to be tested by combining the current temperature condition of the battery to be tested.
2. The method as claimed in claim 1, wherein in the step of measuring the voltage value of the battery under test and calculating the available capacity of the battery under test in real time, the available capacity of the battery under test is calculated in real time based on the charging current and the first capacity value.
3. The method of claim 2, wherein the available capacity of the battery under test is calculated by the following equation:
wherein Q istRepresenting the available capacity, Q, of the battery under test at time tt0Representing said first capacity value, t0Indicates the start time of charging, I(τ)Representing the charging current.
4. The method according to claim 1, wherein the step of calculating the health of the battery under test according to the second capacity value and the rated capacity value of the battery under test in combination with the current temperature condition of the battery under test further comprises the steps of:
measuring the current temperature of the battery to be measured to obtain a weighting proportion coefficient corresponding to the current temperature;
and calculating the health degree of the battery to be tested according to the weighting proportion coefficient, the second capacity value and the rated capacity value of the battery to be tested.
5. The method of claim 4, wherein the health of the battery under test is calculated according to the following formula:
wherein SOH represents the health of the battery to be tested, Q2Representing said second capacity value, K representing said weighting factor, Q0And the rated capacity value of the battery to be tested is represented.
6. The method as claimed in claim 4, wherein the step of measuring the current temperature of the battery to be measured to obtain the weighting scaling factor corresponding to the current temperature further comprises the steps of:
measuring the current temperature of the battery to be measured to obtain the current average temperature value of the battery to be measured;
and inquiring a corresponding relation table according to the average temperature value to obtain a weighting proportion coefficient corresponding to the average temperature.
7. The method according to claim 6, wherein when the corresponding relationship table does not record the weighting scale factor corresponding to the average temperature, the weighting scale factor corresponding to the average temperature is calculated according to the weighting scale factor corresponding to the temperature value adjacent to the average temperature in the corresponding relationship table.
8. A battery health calculation system, the system comprising:
the first capacity value module is used for measuring the voltage value of the battery to be tested when the battery to be tested is in a discharging state, stopping discharging when the battery to be tested discharges to the minimum preset voltage value, and recording the available capacity of the battery to be tested as a first capacity value;
the second capacity value module is used for measuring the voltage value of the battery to be tested and calculating the available capacity of the battery to be tested in real time when the battery to be tested is charged to the maximum preset voltage value, stopping charging when the battery to be tested is charged to the maximum preset voltage value, and recording the available capacity of the battery to be tested as the second capacity value;
and the battery health degree module is used for calculating the health degree of the battery to be tested according to the second capacity value and the rated capacity value of the battery to be tested by combining the current temperature condition of the battery to be tested.
9. The system of claim 8, wherein the second capacity value module comprises:
and the available capacity calculating unit is used for calculating the available capacity of the battery to be tested in real time according to the charging current and the first capacity value in the steps of measuring the voltage value of the battery to be tested and calculating the available capacity of the battery to be tested in real time.
10. The system of claim 8, wherein the battery health module comprises:
the weighting proportion coefficient unit is used for measuring the current temperature of the battery to be measured to obtain a weighting proportion coefficient corresponding to the current temperature;
and the calculating unit is used for calculating the health degree of the battery to be measured according to the weighting proportion coefficient, the second capacity value and the rated capacity value of the battery to be measured.
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| WO2021238228A1 (en) * | 2020-05-28 | 2021-12-02 | 江苏大学 | "standardized temperature"-based online estimation method for state of health of battery within wide temperature range |
| CN114152892A (en) * | 2021-12-01 | 2022-03-08 | 国网山西省电力公司电力科学研究院 | Monitoring method for battery health degree of fault indicator |
| CN115877211A (en) * | 2021-09-23 | 2023-03-31 | 长沙中车智驭新能源科技有限公司 | Online prediction method and system for service life of battery |
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| WO2021238228A1 (en) * | 2020-05-28 | 2021-12-02 | 江苏大学 | "standardized temperature"-based online estimation method for state of health of battery within wide temperature range |
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| GB2610366A (en) * | 2020-05-28 | 2023-03-01 | Univ Jiangsu | "Standardized temperature" -based online estimation method for state of health of battery within wide temperature range |
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| CN115877211A (en) * | 2021-09-23 | 2023-03-31 | 长沙中车智驭新能源科技有限公司 | Online prediction method and system for service life of battery |
| CN114152892A (en) * | 2021-12-01 | 2022-03-08 | 国网山西省电力公司电力科学研究院 | Monitoring method for battery health degree of fault indicator |
| CN114152892B (en) * | 2021-12-01 | 2023-09-22 | 国网山西省电力公司电力科学研究院 | Method for monitoring battery health of fault indicator |
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