CN115237197B - Battery output power control method and system and computer readable storage medium - Google Patents
Battery output power control method and system and computer readable storage medium Download PDFInfo
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- CN115237197B CN115237197B CN202110448401.3A CN202110448401A CN115237197B CN 115237197 B CN115237197 B CN 115237197B CN 202110448401 A CN202110448401 A CN 202110448401A CN 115237197 B CN115237197 B CN 115237197B
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- 238000000034 method Methods 0.000 title claims abstract description 23
- 239000000178 monomer Substances 0.000 claims abstract description 8
- 238000001914 filtration Methods 0.000 claims description 92
- 101100129500 Caenorhabditis elegans max-2 gene Proteins 0.000 claims description 14
- 101100119135 Mus musculus Esrrb gene Proteins 0.000 claims description 12
- RZVAJINKPMORJF-UHFFFAOYSA-N Acetaminophen Chemical compound CC(=O)NC1=CC=C(O)C=C1 RZVAJINKPMORJF-UHFFFAOYSA-N 0.000 claims description 5
- 238000004590 computer program Methods 0.000 claims description 5
- 238000004364 calculation method Methods 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 238000005070 sampling Methods 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/66—Regulating electric power
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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- Electric Propulsion And Braking For Vehicles (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention relates to a battery output power control method and system, and a computer readable storage medium, comprising: acquiring the current voltage value of each single cell of the battery; determining a maximum value U cellMax and a minimum value U cellMin in the current voltage values of all the monomers; calculating the maximum value U cellMax to obtain dU Max; and deriving and calculating the minimum value U cellMin to obtain dU Min; and controlling the output power of the battery according to the comparison result of the dU Max and the preset threshold value and the comparison result of the dU Min and the preset threshold value. The invention respectively and effectively identifies the variation trend of the maximum voltage and the minimum voltage of the battery cell, and applies the variation trend to identify the safety characteristic of the battery and control the output power of the battery, thereby effectively preventing the overvoltage or undervoltage fault of the battery.
Description
Technical Field
The invention relates to the technical field of battery control, in particular to a battery output power control method and system and a computer readable storage medium.
Background
At present, for battery control of an electric automobile, a conventional means is to use a certain voltage threshold to perform simple control, namely, when a vehicle is running dynamically, if the voltage of a battery monomer is greater than the certain voltage threshold for a few seconds continuously, the voltage is judged to be in a safe range, and the power state is recovered to a original state; if the battery voltage is less than a certain voltage threshold, the battery is judged to be in an undervoltage state and the power of the battery is reduced. The current battery control scheme directly judges that the voltage is in a safe voltage range according to a voltage threshold value to release power, and power jump and reciprocation can be generated; in addition, the current battery control scheme limits the power according to the voltage being smaller than a certain voltage threshold value, and does not recognize the actual state of the battery essentially, so that the power of the whole vehicle is greatly reduced, and even if the power is not adjusted timely, the fault is triggered.
Disclosure of Invention
The invention aims to provide a battery output power control method and system and a computer readable storage medium, so as to control the battery output power according to the voltage variation trend of the maximum value and the minimum value of the voltage of a battery cell, and effectively prevent the occurrence of overvoltage or undervoltage faults of the battery.
To achieve the above object, a first aspect of the present invention provides a battery output power control method, including:
Acquiring the current voltage value of each single cell of the battery;
Determining a maximum value U cellMax and a minimum value U cellMin in the current voltage values of all the monomers;
Calculating the maximum value U cellMax to obtain dU Max; and deriving and calculating the minimum value U cellMin to obtain dU Min;
and controlling the output power of the battery according to the comparison result of the dU Max and the preset threshold value and the comparison result of the dU Min and the preset threshold value.
Optionally, the deriving the maximum value U cellMax to calculate the dU Max includes:
filtering the maximum U cellMax by adopting a first preset filtering mode, and deriving a filtering result to obtain dU Max1;
filtering the maximum U cellMax by adopting a second preset filtering mode, and deriving a filtering result to obtain dU Max2;
the one with the greater numerical value in dU Max1 and dU Max2 is selected as the dU Max.
Optionally, the deriving the maximum value U cellMin to calculate the dU Min includes:
filtering the maximum U cellMin by adopting a first preset filtering mode, and deriving a filtering result to obtain dU Min1;
Filtering the maximum U cellMin by adopting a second preset filtering mode, and deriving a filtering result to obtain dU Min2;
The smaller of dU Min1 and dU Min2 is selected as the dU Min.
Optionally, the first preset filtering mode is moving average filtering; the second preset filtering mode is first-order low-pass filtering.
Optionally, the controlling the battery output power according to the comparison result of the dU Max and the preset threshold and the comparison result of the dU Min and the preset threshold includes:
When |dU Max | is not less than u, controlling the output power of the battery according to dU Max;
When |dU Min | is not less than u, controlling the output power of the battery according to dU Min;
Wherein u is a preset threshold.
Optionally, the controlling the battery output power according to the dU Max includes:
Calculating battery output power P1 according to a formula P1=kp (err 1 (T) +T D*dUMax), and performing closed-loop control on the battery output power according to the calculated battery output power P1; wherein kp and T D are parameters calibrated in advance, err1 (T) is the difference between U cellMax and preset safety voltage;
the controlling the battery output power according to the dU Min includes:
Calculating battery output power P2 according to a formula P2=kp (err 2 (T) +T D*dUMin), and performing closed-loop control on the battery output power according to the calculated battery output power P2; wherein err2 (t) is the difference between U cellMin and the preset safety voltage.
A second aspect of the present invention proposes a battery output power control system comprising:
The voltage signal acquisition unit is used for acquiring the current voltage value of each single cell of the battery;
A voltage extremum determining unit for determining a maximum value U cellMax and a minimum value U cellMin among the current voltage values of all the monomers;
The voltage signal processing unit is used for deriving and calculating the maximum value U cellMax to obtain dU Max, and deriving and calculating the minimum value U cellMin to obtain dU Min; and
And the battery power control unit is used for controlling the battery output power according to the comparison result of the dU Max and the preset threshold value and the comparison result of the dU Min and the preset threshold value.
Optionally, the voltage signal processing unit includes:
The first signal processing unit is used for filtering the maximum value U cellMax by adopting a first preset filtering mode and a second preset filtering mode respectively, respectively deriving filtering results of the two filtering modes to obtain dU Max1 and dU Max2, and selecting one with larger value in dU Max1 and dU Max2 as the dU Max;
The second signal processing unit is used for filtering the maximum value U cellMin by adopting a first preset filtering mode and a second preset filtering mode respectively, respectively deriving filtering results of the two filtering modes to obtain dU Min1 and dU Min2, and selecting one with larger value in dU Min1 and dU Min2 as the dU Min;
The first preset filtering mode is moving average filtering; the second preset filtering mode is first-order low-pass filtering.
Optionally, the battery power control unit includes:
A first control unit, configured to calculate a battery output power P1 according to a formula p1=kp (err 1 (T) +t D*dUMax) when |du Max | is equal to or greater than u, and perform closed-loop control on the battery output power according to the calculated battery output power P1; wherein kp and T D are parameters calibrated in advance, err1 (T) is the difference between U cellMax and preset safety voltage;
The second control unit is used for calculating the battery output power P2 according to the formula P2=kp (err 2 (T) +T D*dUMin) when the absolute value of the dU Min is equal to or more than u, and performing closed-loop control on the battery output power according to the calculated battery output power P2; wherein err2 (t) is the difference between U cellMin and the preset safety voltage;
Wherein u is a preset threshold.
A third aspect of the present invention proposes a computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of the battery output power control method of the first aspect.
The implementation of the method and the system for controlling the output power of the battery and the computer readable storage medium has at least the following beneficial effects: the variation trends of the maximum voltage and the minimum voltage of the single battery are respectively and effectively identified, and the variation trends are applied to identifying the safety characteristics of the battery and controlling the output power of the battery, so that the overvoltage or undervoltage faults of the battery are effectively prevented, and the capacity of the battery is better exerted.
Additional features and advantages of the invention will be set forth in the description which follows.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a flowchart of a battery output power control method according to an embodiment of the invention.
Fig. 2 is a schematic diagram of a battery output power control system according to another embodiment of the invention.
Detailed Description
Various exemplary embodiments, features and aspects of the disclosure will be described in detail below with reference to the drawings. In addition, numerous specific details are set forth in the following examples in order to provide a better illustration of the invention. It will be understood by those skilled in the art that the present invention may be practiced without some of these specific details. In some instances, well known means have not been described in detail in order to not obscure the present invention.
An embodiment of the present invention proposes a battery output power control method, referring to fig. 1, the method of the embodiment of the present invention includes steps S1 to S4 as follows:
Step S1, obtaining the current voltage value of each single cell of the battery;
step S2, determining a maximum value U cellMax and a minimum value U cellMin in the current voltage values of all the monomers;
Specifically, a maximum value U cellMax and a minimum value U cellMin are selected from the plurality of cell voltage values U cell obtained in step S1;
Step S3, deriving and calculating the maximum value U cellMax to obtain dU Max; and deriving and calculating the minimum value U cellMin to obtain dU Min;
Specifically, step S3 may be to filter the maximum value U cellMax and the minimum value U cellMin respectively and then derive to eliminate noise caused by voltage sampling;
And S4, controlling the output power of the battery according to the comparison result of the dU Max and the preset threshold value and the comparison result of the dU Min and the preset threshold value.
Specifically, in step S4, whether the battery is over-voltage is determined according to the comparison result of the dU Max and the preset threshold, and in step S4, whether the battery is under-voltage is determined according to the comparison result of the dU Min and the preset threshold; based on the judgment result, the battery output power is controlled by adopting a corresponding control mode.
The method provided by the embodiment of the invention effectively identifies the variation trend of the maximum and minimum voltages of the battery cells, and is applied to controlling the power of the battery and identifying the safety characteristics of the battery, so that the under-voltage fault of the battery is effectively prevented, and the capability of the battery is better exerted within the available range.
Illustratively, deriving the maximum value U cellMax in the step S3 to calculate dU Max includes:
Filtering the maximum U cellMax by adopting a first preset filtering mode to obtain U Max1, and deriving a filtering result U Max1 to obtain dU Max1;
Filtering the maximum U cellMax by adopting a second preset filtering mode to obtain U Max2, and deriving a filtering result U Max2 to obtain dU Max2;
the one with the greater numerical value in dU Max1 and dU Max2 is selected as the dU Max.
Illustratively, deriving the maximum value U cellMin in the step S3 to calculate dU Min includes:
Filtering the maximum U cellMin by adopting a first preset filtering mode to obtain U Min1, and deriving a filtering result U Min1 to obtain dU Min1;
Filtering the maximum U cellMin by adopting a second preset filtering mode to obtain U Min2, and deriving a filtering result U Min2 to obtain dU Min2;
The one with the greater numerical value in dU Min1 and dU Min2 is selected as the dU Min.
Illustratively, the first preset filtering mode is preferably, but not limited to, moving average filtering; the second preset filtering mode is preferably but not limited to first order low pass filtering;
In this embodiment, the calculation formula of the moving average filtering is as follows:
where x is the moving average filtering result, U is the maximum or minimum voltage value of the input, dt is 0.1s, and t is 1s.
In this embodiment, the calculation formula of the first-order low-pass filtering is as follows:
x(k)＝(m*dt+x(k-1)*tau)/(dt+tau)
Where x (k) is the result of the first-order low-pass filtering, x (k-1) is the result of the last first-order low-pass filtering, m is the filter coefficient, dt=0.1 s, and tau=0.5 s.
It should be noted that dt is a time frequency, the time of the moving average is calibrated according to actual data, and the time constant of the first-order low-pass filtering is also calibrated.
Illustratively, the controlling the battery output power according to the comparison result of the dU Max and the preset threshold and the comparison result of the dU Min and the preset threshold includes:
When |dU Max | is not less than u, controlling the output power of the battery according to dU Max;
When |dU Min | is not less than u, controlling the output power of the battery according to dU Min;
In this embodiment, u is selected by referring to the direct current internal resistance and the maximum current that the copper board can bear, i.e., u=r×i Cu.
Illustratively, the controlling battery output power according to the dU Max includes:
Calculating battery output power P1 according to a formula P1=kp (err 1 (T) +T D*dUMax), and performing closed-loop control on the battery output power according to the calculated battery output power P1; wherein kp and T D are parameters calibrated in advance, and are required to be calibrated according to real vehicle or real package data); err1 (t) is the difference between U cellMax and the preset safe voltage;
the controlling the battery output power according to the dU Min includes:
Calculating battery output power P2 according to a formula P2=kp (err 2 (T) +T D*dUMin), and performing closed-loop control on the battery output power according to the calculated battery output power P2; wherein err2 (t) is the difference between U cellMin and the preset safety voltage.
The method provided by the embodiment of the invention is based on the voltage sampling precision and the filter of the existing sensor, is used for identifying the rebound characteristic of the battery, is applied to safety state identification and battery output power control, and is used for better pre-judging whether the lithium ion battery works in a safer use range or not by utilizing the voltage rebound characteristic, thereby playing an important role in power control and safety state identification of the electric automobile.
In addition, another embodiment of the present invention provides a battery output power control system, which may be used to implement the method of the battery output power control system described in the foregoing embodiment, referring to fig. 2, a system according to an embodiment of the present invention includes:
A voltage signal acquisition unit 1 for acquiring the current voltage value of each cell of the battery;
A voltage extremum determining unit 2 for determining a maximum value U cellMax and a minimum value U cellMin among the current voltage values of all the monomers;
The voltage signal processing unit 3 is configured to derive the maximum value U cellMax to obtain dU Max, and derive the minimum value U cellMin to obtain dU Min; and
And the battery power control unit 4 is used for controlling the battery output power according to the comparison result of the dU Max and the preset threshold value and the comparison result of the dU Min and the preset threshold value.
Illustratively, the voltage signal processing unit 3 comprises:
The first signal processing unit is used for filtering the maximum value U cellMax by adopting a first preset filtering mode and a second preset filtering mode respectively, respectively deriving filtering results of the two filtering modes to obtain dU Max1 and dU Max2, and selecting one with larger value in dU Max1 and dU Max2 as the dU Max;
The second signal processing unit is used for filtering the maximum value U cellMin by adopting a first preset filtering mode and a second preset filtering mode respectively, respectively deriving filtering results of the two filtering modes to obtain dU Min1 and dU Min2, and selecting one with larger value in dU Min1 and dU Min2 as the dU Min;
The first preset filtering mode is moving average filtering; the second preset filtering mode is first-order low-pass filtering.
Illustratively, the battery power control unit 4 comprises:
A first control unit, configured to calculate a battery output power P1 according to a formula p1=kp (err 1 (T) +t D*dUMax) when |du Max | is equal to or greater than u, and perform closed-loop control on the battery output power according to the calculated battery output power P1; wherein kp and T D are parameters calibrated in advance, err1 (T) is the difference between U cellMax and preset safety voltage;
The second control unit is used for calculating the battery output power P2 according to the formula P2=kp (err 2 (T) +T D*dUMin) when the absolute value of the dU Min is equal to or more than u, and performing closed-loop control on the battery output power according to the calculated battery output power P2; wherein err2 (t) is the difference between U cellMin and the preset safety voltage;
Wherein u is a preset threshold.
The system embodiments described above are merely illustrative, wherein the elements illustrated as separate elements may or may not be physically separate, and the elements shown as elements may or may not be physical elements, may be located in one place, or may be distributed over a plurality of network elements. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
It should be noted that, the system in the foregoing embodiment corresponds to the method in the foregoing embodiment, and therefore, a part of the system in the foregoing embodiment that is not described in detail may be obtained by referring to the content of the method in the foregoing embodiment, that is, the content of specific steps described in the method in the foregoing embodiment may be understood as a function that can be implemented by the system in this embodiment, which is not described herein again.
Also, the battery output power control system according to the above embodiment may be stored in a computer readable storage medium if implemented in the form of a software functional unit and sold or used as a separate product.
Furthermore, another embodiment of the present invention proposes a computer-readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of the battery output power control method of the above-described embodiment.
In particular, the computer-readable storage medium may include: any entity or device capable of carrying the computer program code, a recording medium, a U disk, a removable hard disk, a magnetic disk, an optical disk, a computer Memory, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), an electrical carrier signal, a telecommunications signal, a software distribution medium, and so forth.
The foregoing description of embodiments of the invention has been presented for purposes of illustration and description, and is not intended to be exhaustive or limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the various embodiments described. The terminology used herein was chosen in order to best explain the principles of the embodiments, the practical application, or the technical improvements in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.
Claims (7)
1. A battery output power control method, characterized by comprising:
continuously obtaining the current voltage value of each single cell of the battery;
Continuously determining a maximum value U cellMax and a minimum value U cellMin in the current voltage values of all the monomers;
Calculating the maximum value U cellMax to obtain dU Max; and deriving and calculating the minimum value U cellMin to obtain dU Min;
Controlling the output power of the battery according to the comparison result of the dU Max and the preset threshold value and the comparison result of the dU Min and the preset threshold value;
Wherein the controlling the battery output power according to the comparison result of the dU Max and the preset threshold and the comparison result of the dU Min and the preset threshold includes:
When |dU Max | is not less than u, controlling the output power of the battery according to dU Max;
When |dU Min | is not less than u, controlling the output power of the battery according to dU Min;
Wherein u is a preset threshold;
wherein said controlling the battery output power according to said dU Max comprises:
Calculating battery output power P1 according to a formula P1=kp (err 1 (T) +T D*dUMax), and performing closed-loop control on the battery output power according to the calculated battery output power P1; wherein kp and T D are parameters calibrated in advance, err1 (T) is the difference between U cellMax and preset safety voltage;
the controlling the battery output power according to the dU Min includes:
Calculating battery output power P2 according to a formula P2=kp (err 2 (t) +TD dU Min), and performing closed-loop control on the battery output power according to the calculated battery output power P2; wherein err2 (t) is the difference between U cellMin and the preset safety voltage.
2. The battery output power control method according to claim 1, wherein the deriving the maximum value U cellMax to calculate dU Max includes:
filtering the maximum U cellMax by adopting a first preset filtering mode, and deriving a filtering result to obtain dU Max1;
filtering the maximum U cellMax by adopting a second preset filtering mode, and deriving a filtering result to obtain dU Max2;
the one with the greater numerical value in dU Max1 and dU Max2 is selected as the dU Max.
3. The battery output power control method according to claim 1, wherein the deriving the maximum value U cellMin to calculate dU Min includes:
filtering the maximum U cellMin by adopting a first preset filtering mode, and deriving a filtering result to obtain dU Min1;
Filtering the maximum U cellMin by adopting a second preset filtering mode, and deriving a filtering result to obtain dU Min2;
The smaller of dU Min1 and dU Min2 is selected as the dU Min.
4. The battery output power control method according to claim 2 or 3, wherein the first preset filtering mode is moving average filtering; the second preset filtering mode is first-order low-pass filtering.
5. A battery output power control system, comprising:
The voltage signal acquisition unit is used for continuously acquiring the current voltage value of each single cell of the battery;
A voltage extremum determining unit for continuously determining a maximum value U cellMax and a minimum value U cellMin among the current voltage values of all the monomers;
The voltage signal processing unit is used for deriving and calculating the maximum value U cellMax to obtain dU Max, and deriving and calculating the minimum value U cellMin to obtain dU Min; and
The battery power control unit is used for controlling the battery output power according to the comparison result of the dU Max and a preset threshold value and the comparison result of the dU Min and the preset threshold value;
Wherein, the battery power control unit includes:
A first control unit, configured to calculate a battery output power P1 according to a formula p1=kp (err 1 (T) +t D*dUMax) when |du Max | is equal to or greater than u, and perform closed-loop control on the battery output power according to the calculated battery output power P1; wherein kp and T D are parameters calibrated in advance, err1 (T) is the difference between U cellMax and preset safety voltage;
The second control unit is used for calculating the battery output power P2 according to the formula P2=kp (err 2 (T) +T D*dUMin) when the absolute value of the dU Min is equal to or more than u, and performing closed-loop control on the battery output power according to the calculated battery output power P2; wherein err2 (t) is the difference between U cellMin and the preset safety voltage;
Wherein u is a preset threshold.
6. The battery output power control system according to claim 5, wherein the voltage signal processing unit includes:
The first signal processing unit is used for filtering the maximum value U cellMax by adopting a first preset filtering mode and a second preset filtering mode respectively, respectively deriving filtering results of the two filtering modes to obtain dU Max1 and dU Max2, and selecting one with larger value in dU Max1 and dU Max2 as the dU Max;
The second signal processing unit is configured to perform filtering on the maximum value U cellMin by using a first preset filtering mode and a second preset filtering mode, respectively, perform derivative on filtering results of the two filtering modes to obtain dU Min1 and dU Min2, and select one with a larger value in dU Min1 and dU Min2 as the dU Min.
7. A computer readable storage medium having stored thereon a computer program, characterized in that the computer program, when executed by a processor, implements the steps of the battery output power control method of any of claims 1 to 4.
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