CN114662265A - Lithium battery backup time correction estimation method and computer-readable storage medium - Google Patents
Lithium battery backup time correction estimation method and computer-readable storage medium Download PDFInfo
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Abstract
The invention relates to a lithium battery backup time correction and estimation method, which comprises the following steps: obtaining the ampere-hour integral residual capacity of the lithium battery by adopting ampere-hour integral decreasing in a first battery capacity range, and calculating first backup time based on the ampere-hour integral residual capacity and the load; calculating a second backup time by adopting ampere-hour integration and voltage linear interpolation within a second battery capacity range; calculating a correction backup time based on a boost voltage, a current battery voltage, an initial battery voltage of the third battery capacity range, and the load amount within a third battery capacity range; and the lifting voltage is obtained by performing voltage linear interpolation point tracing on the basis of a battery voltage change curve of the lithium battery. The invention also relates to a computer-readable storage medium. The method and the device can calculate the backup time more accurately, so that the problem that the backup time is not calculated accurately due to the discharge characteristic of the lithium battery is solved.
Description
Technical Field
The present invention relates to the field of power batteries, and more particularly, to a method for correcting and estimating a backup time of a lithium battery and a computer-readable storage medium.
Background
Lithium batteries are mostly used as UPS power batteries at present. Because the UPS is an uninterrupted power supply, the UPS is switched to the lithium battery to discharge for standby power in the state that the mains supply is powered down, meanwhile, when the battery discharge is about to end, the standby time needs to be reminded, and a client timely saves data in the period of time, so that higher requirements are provided for the estimation of the standby time of the lithium battery. Fig. 1 shows a schematic diagram of the discharge of a UPS using a lithium battery for backup power.
The backup time of the lithium battery can adopt an ampere-hour integration method, but in the primary calculation process, if the charging and discharging time is too long, the ampere-hour integration method is more and more greatly influenced by accumulated errors along with the time, so that the result is possibly unreliable. In order to reduce the accumulated error existing when the battery ampere-hour integral method calculates the battery electric quantity, the UPS generally performs linear interpolation according to the battery voltage, the rated voltage and the EOD voltage (voltage at which the battery discharge ends) when calculating the final electric quantity, so as to accurately shut down the battery according to the sampling voltage of the battery and the EOD point sampling. And counting down when the backup time of the battery meets the time needing warning reminding, judging whether the backup time meets the EOD point, and executing shutdown operation when the backup time meets the EOD point. However, UPSs typically linearly interpolate from battery voltage, nominal voltage, and EOD voltage when calculating the final charge. Fig. 1 shows a voltage discharge curve of a lithium battery. From the discharge characteristic curve of the lithium battery, the battery voltage change in the middle time period of the discharge process is relatively gentle, the voltage curve change of the lithium battery in the last time period is relatively rapid, when the middle time period is excessive to the last time period, the voltage change is not linear change, so that if the voltage sampling linear interpolation is started to calculate the backup time in the transition process, the backup time is not uniformly changed, the early backup time is slowly changed, the later backup time is rapidly changed, the calculation inaccuracy of the backup time is caused, the counting of the backup time which can be pre-alarmed is not finished, and the battery is discharged, finishes shutdown.
Disclosure of Invention
The present invention is directed to a method for correcting and estimating backup time of a lithium battery and a computer-readable storage medium, which can calculate the backup time more accurately.
The technical scheme adopted by the invention for solving the technical problem is as follows: a lithium battery backup time correction estimation method is constructed, and comprises the following steps:
s1, obtaining ampere-hour integral residual capacity of the lithium battery by adopting ampere-hour integral decreasing in a first battery capacity range, and calculating first backup time based on the ampere-hour integral residual capacity and the load;
s2, calculating a second backup time by adopting ampere-hour integration and voltage linear interpolation within the second battery capacity range;
s3, in a third battery capacity range, calculating and correcting backup time based on the uplifting voltage, the current battery voltage, the initial battery voltage of the third battery capacity range, the third battery capacity range and the load amount;
and the lifting voltage is obtained by performing voltage linear interpolation point tracing on the basis of a battery voltage change curve of the lithium battery.
In the method for correcting and estimating the backup time of the lithium battery, the obtaining of the boost voltage includes:
SA, testing the battery voltage change corresponding to the actual discharge time of the lithium battery under a set load to obtain a battery voltage change curve;
SB, selecting a voltage linear interpolation starting point and an alarm voltage point starting point on the battery voltage change curve to perform linear point tracing so as to obtain a linear table look-up range;
and the SC obtains the lifting voltage based on the linear table look-up range and the lithium battery discharging end time.
In the method for correcting and estimating the backup time of a lithium battery according to the present invention, in step S3, the corrected backup time is a quotient of a corrected battery capacity and the load amount, and the corrected battery capacity m satisfies:
in the method for correcting and estimating the backup time of the lithium battery, the method further comprises the following steps: the boost voltage is obtained for a plurality of loads to obtain a functional relationship of the loads to the boost voltage.
In the method for correcting and estimating the backup time of the lithium battery, step S2 further includes:
s21, according to the actual discharge curve of the lithium battery, obtaining the battery voltage of the lithium battery corresponding to the second battery capacity range, and performing voltage linear interpolation on the current voltage to obtain the voltage look-up table residual capacity;
s22, calculating initial correction battery capacity based on the current battery voltage, the initial battery voltage of the second battery capacity range, the ending battery voltage of the second battery capacity range, the ampere-hour integral residual capacity and the voltage look-up table residual capacity;
and S23, calculating the second backup time based on the initial corrected battery capacity and the load amount.
In the method for correcting and estimating the backup time of the lithium battery, in step S21, the remaining capacity k of the voltage lookup table satisfies the following condition:
in the method for estimating the correction of the backup time of a lithium battery according to the present invention, in step S22, the initial corrected battery capacity n satisfies:
the lithium battery backup time correction estimation method further comprises the following steps:
s4, when the current battery voltage is reduced to a battery low voltage alarm point, an alarm is started and countdown is carried out according to the corrected backup time;
and S5, at the same time of ending the countdown, dropping the current battery voltage to the discharge ending voltage and shutting down.
In the method for estimating the lithium battery backup time correction according to the present invention, the first battery capacity range is 1/2 to 3/4 battery capacity, the second battery capacity range is 3/4 to 5/6 battery capacity, and the third battery capacity range is the remaining 1/6 battery capacity.
Another technical solution to solve the technical problem of the present invention is to configure a computer-readable storage medium, on which a computer program is stored, wherein the computer program, when executed by a processor, implements the lithium battery backup time correction estimation method.
By implementing the lithium battery backup time correction estimation method and the computer-readable storage medium, the backup time can be more accurately calculated, so that the problem that the backup time is not accurately calculated due to the discharge characteristic of the lithium battery is solved.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
fig. 1 shows a voltage discharge diagram of a lithium battery;
FIG. 2 shows a voltage discharge curve of a lithium battery;
fig. 3 is a schematic flow chart of a lithium battery backup time correction estimation method according to a first preferred embodiment of the present invention;
fig. 4 shows the later part of the cell voltage curve and the boost voltage.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and do not limit the invention.
The invention relates to a lithium battery backup time correction and estimation method, which comprises the following steps: obtaining the ampere-hour integral residual capacity of the lithium battery by adopting the ampere-hour integral decreasing within the first battery capacity range, and calculating first backup time based on the ampere-hour integral residual capacity and the load amount; calculating a second backup time by adopting ampere-hour integration and voltage linear interpolation within a second battery capacity range; calculating a correction backup time based on a boost voltage, a current battery voltage, an initial battery voltage of the third battery capacity range, and the load amount within a third battery capacity range; and the lifting voltage is obtained by performing voltage linear interpolation point tracing on the basis of a battery voltage change curve of the lithium battery. In the invention, by utilizing the lifting voltage obtained by performing voltage linear interpolation point tracing on the battery voltage change curve based on the lithium battery, a part of voltage of a time period with rapid change in the battery voltage change curve can be cut out, so that when the last alarm countdown is finished, the actual voltage basically reaches the battery voltage with the end of discharge, the backup time can be calculated more accurately, and the problem of inaccurate calculation of the backup time caused by the discharge characteristic of the lithium battery is solved.
Fig. 3 is a schematic flow chart of a lithium battery backup time correction estimation method according to a first preferred embodiment of the present invention. As shown in fig. 3, in step S1, an ampere-hour integrated remaining capacity of the lithium battery is obtained using an ampere-hour integrated decrement within a first battery capacity range, and a first backup time is calculated based on the ampere-hour integrated remaining capacity and a load amount. Preferably, the first battery capacity range is 1/2 to 3/4 battery capacities. As will be appreciated by those skilled in the art, the first battery capacity range may be adjusted according to actual conditions, for example, before the battery capacity of the front 1/2, the ampere-hour integral residual capacity of the lithium battery may be obtained by using ampere-hour integral decrement, and the first backup time may be calculated based on the ampere-hour integral residual capacity and the load amount. For another example, before the battery capacity of the front 3/4, the ampere-hour integral residual capacity of the lithium battery can be obtained by adopting ampere-hour integral decrement, and the first backup time can be calculated based on the ampere-hour integral residual capacity and the load. Of course, other battery capacities may be selected by one skilled in the art. In addition, those skilled in the art know a specific calculation method for obtaining the backup time by using the ampere-hour integral method, and the method will not be described herein again.
In step S2, a second backup time is calculated using ampere-hour integration and voltage linear interpolation within a second battery capacity range. In a preferred embodiment of the present invention, the second battery capacity range is 3/4 to 5/6 battery capacities. As mentioned above, the second battery capacity range may also be set according to actual requirements, such as the front 1/2 to 5/6 battery capacities.
In a preferred embodiment of the present invention, first, according to an actual discharge curve of the lithium battery, a battery voltage of the lithium battery corresponding to the second battery capacity range is obtained, and voltage linear interpolation is performed on the current voltage to obtain a voltage lookup table residual capacity. The cell voltage profile can be seen in fig. 2. As can be seen from the discharge characteristic curve of the lithium battery, the voltage change of the lithium battery in the middle period of the discharge process is relatively gradual, the voltage change of the lithium battery in the last period of the discharge process is relatively rapid, and the voltage change is not linear when the voltage change is over from the middle period to the last period. And the later part of the cell voltage curve is shown in figure 4. In the present invention, the voltage look-up table residual capacity k refers to a linear look-up table performed by using the current battery voltage to obtain the residual capacity corresponding to the current battery voltage, and the specific calculation process is as follows:
the voltage lookup table residual capacity k satisfies:
in a preferred embodiment of the present invention, the first battery capacity range is 1/2 to 3/4 battery capacities, the second battery capacity range is 3/4 to 5/6 battery capacities, and the third battery capacity range is a remaining 1/6 battery capacity.
Therefore, the voltage lookup table residual capacity k satisfies:
then, an initial modified battery capacity n is calculated based on the current battery voltage, the starting battery voltage of the second battery capacity range, the ending battery voltage of the second battery capacity range, the ampere-hour integrated remaining capacity, and the voltage look-up table remaining capacity, i.e., the initial modified battery capacity n is equal to:
as previously described, in a preferred embodiment of the present invention, the first battery capacity range is 1/2 to 3/4 battery capacities, the second battery capacity range is 3/4 to 5/6 battery capacities, and the third battery capacity range is a remaining 1/6 battery capacity.
Therefore, the initial corrected battery capacity n preferably satisfies a condition equal to:
calculating the second backup time based on the initial corrected battery capacity and the load amount. It can be seen from the correction expression that as the voltage gradually decreases in the discharging process of the lithium battery, the battery capacity gradually transits from ampere-hour distribution to voltage table look-up. And then, obtaining the lifting voltage based on the linear table look-up range and the lithium battery discharge end time. Therefore, the second backup time calculated using the method of the present invention is more accurate within the second battery capacity range.
In step S3, a correction backup time is calculated based on the boost voltage, the current battery voltage, the start battery voltage of the third battery capacity range, and the load amount, within a third battery capacity range. In this preferred embodiment, the boost voltage is obtained by performing voltage linear interpolation point tracing based on a battery voltage variation curve of the lithium battery. It will be appreciated by those skilled in the art that the step of obtaining the boost voltage may be performed at any time, as long as it is prior to the step of calculating the corrected backup time.
The step of obtaining the boosted voltage may be performed as follows. Firstly, testing the battery voltage change corresponding to the actual discharge time of the lithium battery under a set load to obtain the battery voltage change curve. As previously mentioned, the cell voltage profile may be as shown in fig. 2. The later part of the cell voltage curve is shown in fig. 4. After the battery voltage change curve is obtained, a voltage linear interpolation starting point and an alarm voltage point starting point can be selected on the battery voltage change curve to perform linear point tracing so as to obtain a linear table look-up range. And then, obtaining the lifting voltage based on the linear table look-up range and the lithium battery discharge end time. Referring to fig. 4, point D is plotted at the starting point of the alarm voltage point (i.e. the start of the countdown), point a is plotted at the starting point of the voltage linear interpolation (i.e. the start of the table lookup for the voltage linear interpolation), two points AD are connected and extend to the end of the discharge, and the obtained range is the range of the linear table lookup. And then obtaining the lifted EOD voltage, namely the battery voltage at the point B is the lifting voltage.
In a preferred embodiment of the present invention, the lifting voltage may be obtained for a plurality of loads to obtain a functional relationship between the loads and the lifting voltage, so that the lifting voltage may be calculated by inputting the loads. For example, after a plurality of loads are tested to obtain a group load and a lifting voltage, normalization processing is performed on the load as a known x, and the lifting voltage is used as an output y to find a suitable function (a plurality of functions can be selected, for example, a logarithmic function, a polynomial function, a linear function, and the like are based on a function curve most accurately close to a plurality of groups of data points).
In a further preferred embodiment of the present invention, it is needless to say that, since the battery voltage curves of the same battery under different discharge rates are not consistent, it is necessary to actually fit the lifting range of the linear interpolation, and under several typical powers, the relationship between the actual load and the lifting value is obtained, the linear relationship is fitted, and finally the relationship is corrected to the calculation formula of the backup time.
In the present invention, the corrected standby power time is a quotient of a corrected battery capacity and the load amount, and the corrected battery capacity m satisfies:
that is, in the preferred embodiment of the present invention, as previously described, the first battery capacity range is 1/2 to 3/4 battery capacities, the second battery capacity range is 3/4 to 5/6 battery capacities, and the third battery capacity range is a remaining 1/6 battery capacity. The corrected battery capacity m
Further, for example, the voltage at point a is 49v, the actual EOD voltage is 45v, and the voltage through the boost is 47:
in the invention, the current battery voltage is used for linear table look-up at the initial voltage for starting table look-up and the EOD point (lifting voltage) for linear interpolation, so that the actual voltage change curve is closer to the linear change form, and then the alarm time is the same as the time from the real voltage change to the end of the EOD point discharge, thus ensuring the accuracy of the backup time.
As shown in fig. 4, the red curve of the AC segment is the actual battery voltage change point, the point O is the voltage of the EOD point when the discharge ends, the point E is the battery low voltage alarm time, the countdown is started at this time, the range in which the linear interpolation is to be performed uses the AH voltage range, it can be ensured that the backup time obtained by the linear interpolation is accurate before the voltage reaches the point D, the countdown is performed in the EF time period at this time, it can be ensured that the countdown for the pre-alarm ends, and the battery voltage reaches the EOD point and is just shut down.
Therefore, in the present invention, the voltage is corrected and estimated by a method of calculating the backup time by linear interpolation, the voltage linear interpolation interval is used for correction, and the EOD (voltage value of the battery at the end of discharging the battery) point for linear interpolation is raised, that is, a part of the voltage of the time period with rapid change is cut off, so that at the end of the last alarm countdown, the actual voltage also substantially reaches the battery voltage at the end of discharging.
In a further preferred embodiment of the invention, the calculated correction backup time may be used for the alert. When the current battery voltage is reduced to a battery low-voltage alarm point, an alarm is started and countdown is performed according to the corrected backup time; then, at the end of the countdown, the current battery voltage drops to the end-of-discharge voltage and shuts down.
By implementing the lithium battery backup time correction estimation method, the backup time can be calculated more accurately, so that the problem that the backup time is not calculated accurately due to the discharge characteristic of the lithium battery is solved.
The invention also relates to a computer-readable storage medium, on which a computer program is stored, which is characterized in that the computer program, when being executed by a processor, carries out all the features of the lithium battery backup time correction estimation method of the invention. The computer program in this document refers to: any expression, in any programming language, code or notation, of a set of instructions intended to cause a system having an information processing capability to perform a particular function either directly or after either or both of the following: a) conversion to other languages, codes or symbols; b) reproduced in a different format.
While the invention has been described with reference to specific embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the scope of the invention. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the invention without departing from its scope. Therefore, it is intended that the invention not be limited to the particular embodiment disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. A lithium battery backup time correction estimation method is characterized by comprising the following steps:
s1, obtaining ampere-hour integral residual capacity of the lithium battery by adopting ampere-hour integral decreasing in a first battery capacity range, and calculating first backup time based on the ampere-hour integral residual capacity and the load;
s2, calculating a second backup time by adopting ampere-hour integration and voltage linear interpolation within the second battery capacity range;
s3, in a third battery capacity range, calculating and correcting backup time based on the uplifting voltage, the current battery voltage, the initial battery voltage of the third battery capacity range, the third battery capacity range and the load amount;
and the lifting voltage is obtained by performing voltage linear interpolation point tracing on the basis of a battery voltage change curve of the lithium battery.
2. The lithium battery backup time correction estimation method according to claim 1, wherein the obtaining of the boost voltage includes:
SA, testing the battery voltage change corresponding to the actual discharge time of the lithium battery under a set load to obtain a battery voltage change curve;
SB, selecting a voltage linear interpolation starting point and an alarm voltage point starting point on the battery voltage change curve to perform linear point tracing so as to obtain a linear table look-up range;
and the SC obtains the lifting voltage based on the linear table look-up range and the lithium battery discharging end time.
3. The lithium battery backup time correction estimation method according to claim 2, wherein in the step S3, the corrected backup time is a quotient of a corrected battery capacity and the load amount, and the corrected battery capacity m satisfies:
4. the lithium battery backup time correction estimation method according to claim 3, characterized by further comprising: the lift voltage is obtained for a plurality of loads to obtain a functional relationship of the loads and the lift voltage.
5. The lithium battery backup time correction estimation method according to any one of claims 1 to 4, wherein the step S2 further comprises:
s21, obtaining the battery voltage of the lithium battery corresponding to the second battery capacity range according to the actual discharge curve of the lithium battery, and performing voltage linear interpolation on the current voltage to obtain the residual capacity of the voltage lookup table;
s22, calculating initial correction battery capacity based on the current battery voltage, the initial battery voltage of the second battery capacity range, the ending battery voltage of the second battery capacity range, the ampere-hour integral residual capacity and the voltage look-up table residual capacity;
and S23, calculating the second backup time based on the initial corrected battery capacity and the load amount.
6. The lithium battery backup time correction estimation method according to claim 5, wherein in the step S21, the voltage lookup table residual capacity k satisfies:
7. the lithium battery backup time correction estimation method according to claim 6, wherein in the step S22, the initial corrected battery capacity n satisfies:
8. the lithium battery backup time correction estimation method according to claim 7, characterized by further comprising:
s4, when the current battery voltage is reduced to a battery low voltage alarm point, an alarm is started and countdown is carried out according to the corrected backup time;
and S5, at the same time of the end of the countdown, dropping the current battery voltage to the discharge end voltage and shutting down.
9. The lithium battery backup time correction estimation method according to claim 8, wherein the first battery capacity range is 1/2 to 3/4 battery capacity, the second battery capacity range is 3/4 to 5/6 battery capacity, and the third battery capacity range is a remaining 1/6 battery capacity.
10. A computer-readable storage medium, on which a computer program is stored, which, when being executed by a processor, implements a lithium battery backup time correction estimation method according to any one of claims 1 to 9.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116794514A (en) * | 2023-05-04 | 2023-09-22 | 商宇(深圳)科技有限公司 | Method for correcting battery aging rate coefficient |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116794514A (en) * | 2023-05-04 | 2023-09-22 | 商宇(深圳)科技有限公司 | Method for correcting battery aging rate coefficient |
| CN116794514B (en) * | 2023-05-04 | 2024-03-22 | 商宇(深圳)科技有限公司 | Method for correcting battery aging rate |
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