CN117590264A - Self-adaptive calculation method, equipment and medium for standing current of battery system - Google Patents
Self-adaptive calculation method, equipment and medium for standing current of battery system Download PDFInfo
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- 238000004364 calculation method Methods 0.000 title claims abstract description 21
- 238000000034 method Methods 0.000 claims abstract description 45
- 239000000178 monomer Substances 0.000 claims abstract description 18
- 230000003068 static effect Effects 0.000 claims abstract description 18
- 238000005070 sampling Methods 0.000 claims description 10
- 238000004590 computer program Methods 0.000 claims description 9
- 238000007599 discharging Methods 0.000 claims description 6
- 230000003044 adaptive effect Effects 0.000 claims description 5
- 238000009825 accumulation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/389—Measuring internal impedance, internal conductance or related variables
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
- G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/367—Software therefor, e.g. for battery testing using modelling or look-up tables
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
- G01R31/3842—Arrangements for monitoring battery or accumulator variables, e.g. SoC combining voltage and current measurements
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/385—Arrangements for measuring battery or accumulator variables
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/385—Arrangements for measuring battery or accumulator variables
- G01R31/387—Determining ampere-hour charge capacity or SoC
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/385—Arrangements for measuring battery or accumulator variables
- G01R31/387—Determining ampere-hour charge capacity or SoC
- G01R31/388—Determining ampere-hour charge capacity or SoC involving voltage measurements
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Secondary Cells (AREA)
Abstract
The invention discloses a self-adaptive calculation method, equipment and medium for standing current of a battery system, wherein the method comprises the following steps: s1: judging whether the current system is in a static state or not, and if so, judging whether the minimum monomer voltage is within a specified voltage range or not; s2: judging whether the voltage is stable or not, and if so, calculating the minimum monomer voltage Vmin1; s3: calculating the minimum monomer voltage Vmin2 after the standing process is finished; s4: and obtaining the SOC of the battery pack under the standing condition and the SOC of the battery pack under the ending standing condition according to the minimum cell voltage Vmin1 and the minimum cell voltage Vmin2, and calculating the standing current according to the standing process time. According to the invention, the static current is not directly collected, and the actual static current is estimated through the capacity change before and after the static time, so that the SOC estimation precision in a static state is improved.
Description
Technical Field
The invention relates to the technical field of power electronics, in particular to a self-adaptive calculation method, equipment and medium for standing current of a battery system.
Background
Since the rest current is very small, it is difficult to directly collect the battery by a battery system (BMS), and the difference of the rest current affects the estimation of the battery SOC, and meanwhile, the estimation error of the SOC is large due to the inaccuracy of the rest current.
Therefore, how to provide a method for adaptively calculating the standing current without directly collecting the standing current is a problem that needs to be solved by those skilled in the art.
Disclosure of Invention
In view of the above, the present invention provides a method, apparatus and medium for adaptively calculating a stationary current of a battery system, which estimates the current level of the BMS system in a stationary state, and reduces the problem of inaccurate estimation of the SOC of the battery caused by inaccurate collection of the stationary current, thereby improving the estimation accuracy of the SOC in the stationary state.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
in a first aspect, the present invention provides a method for adaptively calculating a standing current of a battery system, comprising:
s1: judging whether the current system is in a static state or not, and if so, judging whether the minimum monomer voltage Vmin0 is in a specified voltage range or not;
s2: judging whether the voltage is stable or not, and if so, calculating the minimum monomer voltage Vmin1;
s3: calculating the minimum monomer voltage Vmin2 after the standing process is finished;
s4: and obtaining the SOC of the battery pack under the standing condition and the SOC of the battery pack under the ending standing condition according to the minimum cell voltage Vmin1 and the minimum cell voltage Vmin2, and calculating the standing current according to the standing process time.
Preferably, the specific implementation process of S1 is as follows:
judging whether the sampling current is equal to 0, and if the current is equal to 0, indicating that the current system is in a static state;
whether the minimum monomer voltage Vmin0 is within a range of 3350mV to 3550mV or 2800mV to 3280mV is judged, and if so, the next judgment is performed.
Preferably, in S3, the principle of determining the end of the standing process is:
if the charge and discharge current exists, the equalization mode is started, and when the under-voltage state is entered, the standing process is considered to be ended.
Preferably, the stationary current calculation formula in S4 is:
Pstandby＝(SOCstrat-SOCend)*Cap/T
wherein Pstandby represents a rest current, SOCstart represents an SOC of the battery pack under a rest condition, SOCend represents an SOC of the battery pack under an end rest condition, cap represents a total capacity of the battery pack, and T represents a rest time period at this time.
Preferably, before calculating the rest current, further comprising:
judging whether the duration of the standing process is greater than a preset value, if so, judging whether the SOC under the standing condition is greater than the SOC under the condition that the battery pack is ended;
if the calculated standing current is satisfied;
judging whether the standing current meets the preset condition, and if so, enabling the calculated standing current to be effective.
Preferably, the preset value is set to 24 hours; the preset condition is that the standing current is less than 500mA.
In a second aspect, the present invention provides a computer device comprising:
a memory for storing a computer program;
and a processor for implementing the steps of the battery system standing current adaptive calculation method when executing the computer program.
In a third aspect, the present invention provides a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of the method for adaptive calculation of standing currents in a battery system.
Compared with the prior art, the invention discloses a self-adaptive calculation method, equipment and medium for the static current of a battery system, which can estimate the actual static current through capacity change before and after the static time without directly collecting the static current, thereby improving the SOC estimation precision in the static state.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present invention, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
Fig. 1 is a flowchart of a method for adaptively calculating a standing current of a battery system according to the present invention.
Fig. 2 is a flowchart of another embodiment method provided in the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The embodiment of the invention discloses a self-adaptive calculation method for standing current of a battery system, which is shown in fig. 1 and comprises the following steps:
s1: judging whether the current system is in a static state, if so, judging whether the minimum cell voltage Vmin0 is in a specified voltage range, wherein the minimum cell voltage refers to the voltage of the string of cells with the lowest voltage; in particular, the method comprises the steps of,
s101: judging whether the sampling current is equal to 0, and if the current is equal to 0, indicating that the current system is in a static state; if not, ending the calculation;
s102: whether the minimum monomer voltage Vmin0 is within a range of 3350-3550 mV or 2800-3280 mV is judged, if yes, the next judgment is carried out, and if not, the calculation is ended.
S2: judging whether the voltage is stable or not, if the minimum monomer voltage Vmin1 is calculated stably, judging whether the sampling current is 0 or not, if the sampling current is not met at the same time, ending the calculation, and if the sampling current is 0, continuing to judge whether the voltage is stable or not;
s3: calculating the minimum monomer voltage Vmin2 after the standing process is finished; specifically, whether the standing process is finished is judged, if the charging and discharging current exists or the charging and discharging current does not exist, but the equalization mode is started, and when the under-voltage state is entered, the standing process is considered to be finished.
S4: obtaining the SOC of the battery pack under the standing condition and the SOC of the battery pack under the ending standing condition according to the minimum cell voltage Vmin1 and the minimum cell voltage Vmin2 through a SOC-OCV comparison table in the table 1, and calculating the standing current according to the standing process time length:
Pstandby＝(SOCstrat-SOCend)*Cap/T
wherein Pstandby represents a rest current, SOCstart represents an SOC of the battery pack under a rest condition, SOCend represents an SOC of the battery pack under an end rest condition, cap represents a total capacity of the battery pack, and T represents a rest time period at this time.
TABLE 1SOC-OCV comparison Table
| SOC[％] | VcellMinimum[mV] |
| 0 | 3202 |
| 10 | 3237 |
| 20 | 3267 |
| 30 | 3286 |
| 40 | 3289 |
| 50 | 3292 |
| 60 | 3322 |
| 70 | 3326 |
| 80 | 3328 |
| 90 | 3331 |
| 100 | 3405 |
On the basis of the above embodiment, the embodiment of the present invention further provides a method for adaptively calculating a standing current of a battery system, as shown in fig. 2, including:
s1: judging whether the current system is in a static state or not, and if so, judging whether the minimum monomer voltage Vmin0 is in a specified voltage range or not; in particular, the method comprises the steps of,
s101: judging whether the sampling current is equal to 0, if so, indicating that the current system is in a static state, and if not, ending calculation;
s102: whether the minimum monomer voltage Vmin0 is within a range of 3350-3550 mV or 2800-3280 mV is judged, if yes, the next judgment is carried out, and if not, the calculation is ended.
S2: judging whether the voltage is stable or not, if the minimum monomer voltage Vmin1 is calculated stably, judging whether the sampling current is 0 or not, if the sampling current is not met at the same time, ending the calculation, and if the sampling current is 0, continuing to judge whether the voltage is stable or not;
s3: calculating the minimum monomer voltage Vmin2 after the standing process is finished; specifically, whether the standing process is finished is judged, if the charging and discharging current exists or the charging and discharging current does not exist, but the equalization mode is started, and when the under-voltage state is entered, the standing process is considered to be finished. More specifically, the principle of judging whether the standing process is ended is to judge whether the current at this time is 0, if not, the standing process is ended, if it is further judged whether the termination monitoring voltage is reached, if it is, the standing process is ended, if it is not, time accumulation is performed to judge whether the current is 0 again.
S4: and correspondingly obtaining the SOC of the battery pack under the standing condition and the SOC of the battery pack under the ending standing condition according to the minimum cell voltage Vmin1 and the minimum cell voltage Vmin2 through an SOC-OCV comparison table. In order to improve the accuracy of the estimated rest current, the following constraints are added:
judging whether the duration of the standing process is greater than a preset value, if so, judging whether the SOC under the standing condition is greater than the SOC under the condition that the battery pack is ended;
if the calculated standing current is satisfied: pstandby= (SOCstrat-SOCend) Cap/T;
judging whether the standing current meets the preset condition, and if so, enabling the calculated standing current to be effective.
If the above-mentioned limitation condition is not satisfied, it is indicated that the calculation result is invalid.
In the present embodiment, the preset value is set to 24 hours; the preset condition is that the standing current is less than 500mA.
The present invention provides a computer device comprising:
a memory for storing a computer program;
and a processor for implementing the steps of the battery system standing current adaptive calculation method when executing the computer program.
For an introduction to a computer device provided by the present invention, refer to the above method embodiment, and the disclosure is not repeated here.
The computer readable storage medium in the present invention stores a computer program which, when executed by a processor, implements the steps of a battery system stationary current adaptive calculation method as described above. The storage medium includes: a mobile storage device, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), a magnetic disk or an optical disk, or the like, which can store program codes.
For the description of the computer-readable storage medium provided by the present invention, refer to the above method embodiments, and the disclosure is not repeated here.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant points refer to the description of the method section.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (8)
1. A method for adaptively calculating a stationary current of a battery system, comprising:
s1: judging whether the current system is in a static state or not, and if so, judging whether the minimum monomer voltage Vmin0 is in a specified voltage range or not;
s2: judging whether the voltage is stable or not, and if so, calculating the minimum monomer voltage Vmin1;
s3: calculating the minimum monomer voltage Vmin2 after the standing process is finished;
s4: and obtaining the SOC of the battery pack under the standing condition and the SOC of the battery pack under the ending standing condition according to the minimum cell voltage Vmin1 and the minimum cell voltage Vmin2, and calculating the standing current according to the standing process time.
2. The self-adaptive calculation method for the standing current of the battery system according to claim 1, wherein the specific implementation process of S1 is as follows:
judging whether the sampling current is equal to 0, and if the current is equal to 0, indicating that the current system is in a static state;
whether the minimum monomer voltage Vmin0 is within a range of 3350mV to 3550mV or 2800mV to 3280mV is judged, and if so, the next judgment is performed.
3. The method for adaptively calculating the standing current of a battery system according to claim 1, wherein in S3, the standing process end judgment principle is:
if the charging and discharging current exists or the charging and discharging current does not exist, but the equalization mode is started, and when the under-voltage state is entered, the standing process is considered to be ended.
4. The method for adaptively calculating the standing current of the battery system according to claim 1, wherein the standing current calculation formula in S4 is:
Pstandby＝(SOCstrat-SOCend)*Cap/T
wherein Pstandby represents a rest current, SOCstart represents an SOC of the battery pack under a rest condition, SOCend represents an SOC of the battery pack under an end rest condition, cap represents a total capacity of the battery pack, and T represents a rest time period at this time.
5. The method for adaptively calculating a standing current of a battery system according to claim 1, further comprising, before calculating the standing current:
judging whether the duration of the standing process is greater than a preset value, if so, judging whether the SOC under the standing condition is greater than the SOC under the condition that the battery pack is ended;
if the calculated standing current is satisfied;
judging whether the standing current meets the preset condition, and if so, enabling the calculated standing current to be effective.
6. The method for adaptively calculating a standing current of a battery system according to claim 5, wherein the preset value is set to 24 hours; the preset condition is that the standing current is less than 500mA.
7. A computer device, comprising:
a memory for storing a computer program;
a processor for implementing the steps of a battery system stationary current adaptive calculation method according to any one of claims 1 to 6 when executing the computer program.
8. A computer-readable storage medium, wherein a computer program is stored on the computer-readable storage medium, which when executed by a processor, implements the steps of a method for adaptively calculating a standing current of a battery system according to any one of claims 1 to 6.
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