CN117656933A - Battery charge state determining method and device, terminal equipment and power battery - Google Patents
Battery charge state determining method and device, terminal equipment and power battery Download PDFInfo
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- CN117656933A CN117656933A CN202211056247.6A CN202211056247A CN117656933A CN 117656933 A CN117656933 A CN 117656933A CN 202211056247 A CN202211056247 A CN 202211056247A CN 117656933 A CN117656933 A CN 117656933A
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- 238000000034 method Methods 0.000 title claims abstract description 99
- 230000008569 process Effects 0.000 claims abstract description 31
- 238000004590 computer program Methods 0.000 claims description 31
- 238000012937 correction Methods 0.000 claims description 26
- 238000007599 discharging Methods 0.000 description 7
- 230000006870 function Effects 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 239000000178 monomer Substances 0.000 description 6
- 230000009286 beneficial effect Effects 0.000 description 4
- 238000004891 communication Methods 0.000 description 4
- 230000004044 response Effects 0.000 description 4
- 238000001514 detection method Methods 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 238000013507 mapping Methods 0.000 description 2
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- QHGJSLXSVXVKHZ-UHFFFAOYSA-N dilithium;dioxido(dioxo)manganese Chemical compound [Li+].[Li+].[O-][Mn]([O-])(=O)=O QHGJSLXSVXVKHZ-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 229910000625 lithium cobalt oxide Inorganic materials 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 description 1
- BFZPBUKRYWOWDV-UHFFFAOYSA-N lithium;oxido(oxo)cobalt Chemical compound [Li+].[O-][Co]=O BFZPBUKRYWOWDV-UHFFFAOYSA-N 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
- 230000003068 static effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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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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Abstract
The application provides a method and a device for determining a battery state of charge, a terminal device, a power battery and a vehicle, wherein the method comprises the following steps: acquiring operation data corresponding to each time point in the operation process of the target battery; judging whether the power value of the target battery at the preset time is a peak power value or not according to each operation data; if yes, determining the target state of charge of the target battery according to the operation data and the peak power value. According to the scheme, the corresponding target state of charge is determined according to the operation data in the operation process of the target battery, namely, the target state of charge of the target battery can be determined in the operation process of the battery, so that the convenience in determining the state of charge of the battery is improved.
Description
Technical Field
The present disclosure relates to the field of battery management technologies, and in particular, to a method and an apparatus for determining a battery state of charge, a terminal device, a power battery, and a vehicle.
Background
Currently, batteries are widely used in various fields of industry. The battery comprises a battery cell and a battery management system (Battery Management System, BMS); the battery management system is commonly called a battery nurse or a battery manager, can intelligently manage and maintain each battery unit, prevents the battery from being overcharged and overdischarged, prolongs the service life of the battery, and monitors the state of the battery. The battery management system generally determines a target state of charge (SOC) of the battery by a state of charge (SOC) correction method and corrects the estimated SOC. The general SOC correction method includes static open circuit voltage (open circuit voltage, OCV) correction and full charge correction, but if the battery is not left standing or is not full charged for a long time, the correction cannot be performed, which will cause the accumulated error of the state of charge of the battery to be larger and larger.
Therefore, how to improve the convenience of determining the state of charge of the battery is a technical problem that needs to be solved by those skilled in the art.
Disclosure of Invention
It is an object of the present application to provide a method, an apparatus, a terminal device, a power battery, a vehicle, a computer readable storage medium and a computer program product for determining a state of charge of a battery more conveniently.
In a first aspect, the present application provides a method of determining a state of charge of a battery. The method comprises the following steps:
acquiring operation data corresponding to each time point in the operation process of the target battery;
judging whether the power value of the target battery at the preset moment is a peak power value or not according to each operation data;
if yes, determining the target state of charge of the target battery according to the operation data and the peak power value.
In one embodiment, the determining, according to each of the operation data, whether the power value of the target battery at the preset time is a peak power value includes:
judging whether the duration of maintaining the power of the target battery in a stable state reaches a preset duration or not according to each operation data;
if so, judging whether the voltage value of the target battery at the preset moment reaches a corresponding voltage threshold value; the preset time is the time corresponding to the time when the power of the target battery maintains the stable state and reaches the preset time;
if yes, judging the power value of the target battery at the preset time as a peak power value.
In one embodiment, the determining whether the voltage value of the target battery reaches the corresponding voltage threshold at the preset time includes:
determining a voltage threshold according to the charge and discharge state of the target battery;
and at the preset moment, acquiring a corresponding voltage value according to the charge and discharge state of the target battery, and judging whether the voltage value reaches the voltage threshold value or not.
In one embodiment, the determining the target state of charge of the target battery according to the operation data and the peak power value includes:
and inquiring a preset power meter according to the peak power value, the module highest temperature and the module lowest temperature to obtain the target state of charge of the target battery.
In one embodiment, after said determining the target state of charge of the target battery from the operating data and the peak power value, the method further comprises:
acquiring an estimated state of charge of the target battery;
and correcting the estimated state of charge by using the target state of charge when the estimated state of charge is inconsistent with the target state of charge.
In one embodiment, after said correcting said estimated state of charge with said target state of charge, said method further comprises:
generating and pushing state of charge correction information; the state of charge correction information characterizes a correction to the estimated state of charge.
In a second aspect, the present application further provides a device for determining a state of charge of a battery. The device comprises:
the acquisition module is used for acquiring operation data corresponding to each time point in the operation process of the target battery;
the judging module is used for judging whether the power value of the target battery at the preset moment is a peak power value or not according to the operation data; if yes, calling an execution module;
the execution module is used for determining the target state of charge of the target battery according to the operation data and the peak power value.
In a third aspect, the present application further provides a terminal device. The terminal device comprises a memory, a processor and a computer program stored in the memory and executable on the processor, which processor, when executing the computer program, implements the steps of the method as described above.
In a fourth aspect, the present application also provides a power cell comprising a battery management system which, when operated, performs the steps of the method as described above.
In a fifth aspect, the present application also provides a vehicle comprising a vehicle body, further comprising a controller, the controller performing the steps of the method as described above.
In a sixth aspect, the present application also provides a computer-readable storage medium. The computer readable storage medium stores a computer program which, when executed by a processor, implements the steps of the method as described above.
In a seventh aspect, the present application also provides a computer program product. The computer program product comprises a computer program which, when executed by a processor, implements the steps of the method as described above.
According to the method for determining the battery state of charge, which is provided by the embodiment of the application, operation data corresponding to each time point in the operation process of the target battery are obtained; judging whether the power value of the target battery at the preset time is a peak power value or not according to each operation data; if yes, determining the target state of charge of the target battery according to the operation data and the peak power value. According to the scheme, the corresponding target state of charge is determined according to the operation data in the operation process of the target battery, namely, the target state of charge of the target battery can be determined in the operation process of the battery, so that the convenience in determining the state of charge of the battery is improved.
It can be appreciated that the apparatus for determining a battery state of charge, the terminal device, the power battery, the vehicle, the computer readable storage medium and the computer program product provided in the embodiments of the present application have the same advantages as the method for determining a battery state of charge described above, and are not described herein again.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present application, and 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 method for determining a battery state of charge according to an embodiment of the present application;
FIG. 2 is a flowchart of another method for determining a state of charge of a battery according to an embodiment of the present disclosure;
FIG. 3 is a schematic diagram of a time axis according to an embodiment of the present disclosure;
fig. 4 is a schematic structural diagram of a device for determining a state of charge of a battery according to an embodiment of the present application;
fig. 5 is a schematic structural diagram of a terminal device according to an embodiment of the present application.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system configurations, techniques, etc. in order to provide a thorough understanding of the embodiments of the present application. It will be apparent, however, to one skilled in the art that the present application may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present application with unnecessary detail.
It should be understood that the terms "comprises" and/or "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.
It should also be understood that the term "and/or" as used in this specification and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes such combinations.
As used in this specification and the appended claims, the term "if" may be interpreted as "when..once" or "in response to a determination" or "in response to detection" depending on the context. Similarly, the phrase "if a determination" or "if a [ described condition or event ] is detected" may be interpreted in the context of meaning "upon determination" or "in response to determination" or "upon detection of a [ described condition or event ]" or "in response to detection of a [ described condition or event ]".
Reference in the specification to "one embodiment" or "some embodiments" or the like means that a particular feature, structure, or characteristic described in connection with the embodiment is included in one or more embodiments of the application. Thus, appearances of the phrases "in one embodiment," "in some embodiments," "in other embodiments," and the like in the specification are not necessarily all referring to the same embodiment, but mean "one or more but not all embodiments" unless expressly specified otherwise. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless expressly specified otherwise. "plurality" means "two or more".
The method for determining the state of charge of the battery, provided by the embodiment of the application, can be applied to a battery management system of a power battery, and the battery management system determines the target state of charge by running a corresponding computer program; the method can also be applied to a system comprising a power battery and a server, and the server determines the target state of charge by running a corresponding computer program and then sends the target state of charge to a battery management system of the power battery; the method can also be applied to a system comprising a power battery and terminal equipment, and the processor of the terminal system determines the target state of charge through running a corresponding computer program and then sends the target state of charge to a battery management system of the power battery.
Fig. 1 is a flowchart of a method for determining a battery state of charge according to an embodiment of the present application. For the sake of convenience, only the portions relevant to the present embodiment are shown, and the method provided in this embodiment includes the following steps:
s100: and acquiring operation data corresponding to each time point in the operation process of the target battery.
Wherein the operational data refers to data characterizing the operational state of the target battery; the target battery in this embodiment includes a lithium ion battery, such as a lithium iron phosphate battery, a lithium cobalt oxide battery, a lithium manganate battery, and the like, and the specific type of the target battery is not limited in this embodiment.
In this embodiment, the operation data of the target battery is obtained at each time point, and each time point may be a time point determined according to a preset period, or may be a time point specified by another manner.
Specifically, the operation data corresponding to each time point includes, but is not limited to, a power value, a voltage value, a temperature value, and the like, wherein the power value includes a charging power Pcha and a discharging power Pdch, the voltage value includes a maximum monomer voltage Vmax and a minimum monomer voltage Vmin, and the temperature value includes a module highest temperature Tmax and a module lowest temperature Tmin, and the like; wherein the maximum cell voltage Vmax or the minimum cell voltage Vmin refers to the maximum voltage or the minimum voltage among the plurality of battery cells in the target battery at the same point in time; the module maximum temperature Tmax or the module minimum temperature Tmin refers to the maximum temperature or the minimum temperature of the plurality of battery cells in the target battery at the same point of time, or the maximum temperature or the minimum temperature of the plurality of battery modules in the target battery at the same point of time, and the plurality of battery cells are included in the battery module.
In the actual operation, the operation data of the target battery can be collected in real time, and then the data corresponding to the preset duration is screened out from the collected operation data, and further the subsequent judgment operation is carried out according to the screened operation data; or collecting a corresponding number of operation data according to a preset time length, and then carrying out subsequent judgment operation according to the collected operation data; the embodiment is not limited to a specific manner of acquiring the operation data.
S200: judging whether the power value of the target battery at the preset time is a peak power value or not according to each operation data; if yes, executing S300; if not, returning to S100;
wherein the peak power value refers to a peak value of the power value of the target battery; the charge and discharge states of the target battery include a charge state and a discharge state; the peak power value includes a peak charge power value and a peak discharge power value according to the difference in the charge and discharge states of the target battery. In this embodiment, each operation data within the preset time period is compared and judged, and whether the power value of the target battery at the preset time is the peak power value is determined.
Specifically, if it is determined that the power value of the target battery at the preset time is the peak power value, it indicates that the power value at the preset time satisfies the condition that triggers the execution of the operation of determining the target state of charge, so S300 is executed; otherwise, the power value indicating the preset time does not satisfy the condition that triggers the execution of the operation of determining the target state of charge, and therefore S100 is continued: and acquiring operation data corresponding to each time point in the operation process of the target battery.
S300: and determining the target state of charge of the target battery according to the operation data and the peak power value.
It should be noted that, the preset power table provided by the battery factory generally includes a peak power value (peak charging power value and/or peak discharging power value), a continuous charging power and a continuous discharging power, and the corresponding mapping relationship can be searched from the preset power table according to the operation data and the peak power value, so as to determine the target state of charge corresponding to the operation data and the peak power value.
In actual operation, the target state of charge can be directly used as the state of charge of the target battery; the corrected state of charge may also be determined based on the target state of charge, with the corrected state of charge being the state of charge of the target battery.
According to the method for determining the battery state of charge, which is provided by the embodiment of the application, operation data corresponding to each time point in the operation process of the target battery are obtained; judging whether the power value of the target battery at the preset time is a peak power value or not according to each operation data; if yes, determining the target state of charge of the target battery according to the operation data and the peak power value. According to the scheme, the corresponding target state of charge is determined according to the operation data in the operation process of the target battery, namely, the target state of charge of the target battery can be determined in the operation process of the battery, so that the convenience in determining the state of charge of the battery is improved.
Fig. 2 is a flowchart of another method for determining a state of charge of a battery according to an embodiment of the present application. On the basis of the foregoing embodiment, the present embodiment further describes and optimizes the technical solution, and specifically in this embodiment, as shown in fig. 2, determining, according to each operation data, whether the power value of the target battery at the preset time is the peak power value includes:
s201: judging whether the duration of maintaining the power of the target battery in a stable state reaches a preset duration or not according to each operation data; if so, executing S202; if not, the process continues to step S201.
Specifically, the battery management system acquires operation data at each time point, for example, acquires operation data once every 1s, and always keeps storing operation data for a preset time period (10 s). Fig. 3 is a schematic diagram of a time axis provided in an embodiment of the present application, where the preset duration is t 0 ～t 10 ，t 1 ～t 11 Etc.
Specifically, in this embodiment, the power value in the preset time period is obtained, and whether the difference value of the power values of each adjacent time point in the preset time period is smaller than the power difference threshold value is determined, if so, the time period for maintaining the power of the target battery in the stable state reaches the preset time period. The specific value of the power difference threshold is not limited in this embodiment, and may be adjusted according to the type of the target battery. In a particular embodiment, |P t -P t+1 The I is less than or equal to 5kW. Or judging that any two time points in the preset time period correspond to each otherIf the power values are smaller than the power difference threshold, the duration of maintaining the power of the target battery in the steady state reaches the preset duration.
If the duration of maintaining the power of the target battery in the steady state reaches the preset duration, continuing to execute S202; otherwise, it indicates that the condition triggering the execution of the operation of determining the target state of charge is not currently satisfied, and the execution of step S201 is continued.
S202: judging whether the voltage value of the target battery at the preset moment reaches a corresponding voltage threshold value or not; if yes, judging the power value of the target battery at the preset time as a peak power value; if not, the process returns to S100.
Specifically, the preset time is a time corresponding to when the duration of maintaining the power of the target battery in the steady state reaches the preset duration. If the preset time period is 10s, and at t 0 ～t 10 The power values of adjacent time points are smaller than a power difference threshold, namely the power is kept in a stable state for a preset time period, and t 10 I.e., the time corresponding to the time when the power of the target battery maintains the steady state reaches the preset time.
Specifically, in conjunction with S201, it can be known that in this embodiment, S202 is entered only when the duration of maintaining the power of the target battery in the steady state reaches the preset duration: judging whether the voltage value of the target battery at the preset moment reaches a corresponding voltage threshold value or not; and when the voltage value of the target battery reaches the corresponding voltage threshold value at the preset time, judging that the power value of the target battery at the preset time is the peak power value. That is, in this embodiment, when the target battery simultaneously satisfies two conditions that the duration of maintaining the steady state of power reaches the preset duration and the voltage value at the preset time reaches the corresponding voltage threshold, the power value at the preset time is the peak power value; if any one of the conditions is not satisfied, the power value indicating the preset time is not the peak power value, so that the operation data corresponding to each time point in the operation process of the target battery needs to be continuously acquired.
Therefore, according to the method of the embodiment, whether the power value of the target battery at the preset time is the peak power value can be efficiently and conveniently determined, so that the target state of charge efficiency and convenience of determining the target battery are improved.
In a specific embodiment, determining whether the voltage value of the target battery reaches the corresponding voltage threshold at the preset time includes:
determining a voltage threshold according to the charge and discharge state of the target battery;
and at the preset moment, acquiring a voltage value of the target battery according to the charge and discharge state of the target battery, and judging whether the voltage value reaches the voltage threshold.
When the target battery is in a charging state, the corresponding voltage threshold value is an upper limit voltage value; when the target battery is in a discharging state, the corresponding voltage threshold is a lower limit voltage value. Correspondingly, when the target battery is in a charging state, the correspondingly obtained voltage value is the maximum single voltage Vmax of the target battery; when the target battery is in a discharge state, the corresponding acquired voltage value is the minimum cell voltage Vmin of the target battery.
It can be understood that in actual operation, the corresponding voltage threshold value may be determined in advance according to the charge and discharge state of the target battery, and then the voltage value corresponding to the charge and discharge state of the target battery may be obtained at a preset time; the voltage threshold value and the voltage value corresponding to the charge/discharge state of the target battery may be acquired at the same time at the preset time.
After the voltage value and the voltage threshold value are obtained, judging whether the voltage value reaches the voltage threshold value or not; if the voltage value reaches the voltage threshold, the voltage value of the target battery at the preset time reaches the corresponding voltage threshold; otherwise, the voltage value of the target battery at the preset moment does not reach the corresponding voltage threshold value. In actual operation, the voltage threshold may be a threshold range, and when the voltage value is within the threshold range, it indicates that the voltage value reaches the voltage threshold.
Therefore, according to the method of the embodiment, the voltage threshold and the voltage value of the target battery can be determined according to the charge and discharge state of the target battery, and whether the voltage value at the preset time reaches the voltage threshold determination result is determined more accurately, so that the accuracy of determining the target state of charge of the target battery can be improved.
On the basis of the above embodiment, the present embodiment further describes and optimizes a technical solution, and specifically, in this embodiment, determining, according to the operation data and the peak power value, the target state of charge of the target battery includes:
and inquiring a preset power meter according to the peak power value, the module highest temperature and the module lowest temperature to obtain the target state of charge of the target battery.
Wherein the preset power meter is a voltage-temperature mapping table. In this embodiment, the peak power value is determined to be the peak charge power value or the peak discharge power value according to the charge-discharge state of the target battery; and inquiring a preset power meter according to the peak charge power value or the peak discharge power value, the module highest temperature and the module lowest temperature to obtain the target state of charge of the target battery.
It can be understood that, since the duration of maintaining the power of the target battery in the steady state reaches the preset duration, the power value at the preset moment is the peak power value. Specifically, when the target battery is in a charged state, the preset power table is queried according to the charging power Pcha at a preset time and the module highest temperature Tmax, and the module lowest temperature Tmin, namely, the preset power table is reversely queried according to [ Pcha, tmax, tmin ], the maximum value of the charged state and the minimum value of the charged state are obtained, and the larger value of the maximum value of the charged state and the minimum value of the charged state is determined as the target charged state of the target battery. When the target battery is in a discharge state, inquiring a preset power meter according to the discharge power Pdch at a preset moment and the maximum temperature Tmax of the module and the minimum temperature Tmin of the module, namely reversely inquiring the preset power meter according to [ Pdch, tmax, tmin ] to obtain a maximum value and a minimum value of the discharge state of charge, and determining the larger value of the maximum value and the minimum value of the discharge state of charge as the target state of charge of the target battery.
Therefore, the target state of charge can be determined efficiently and conveniently.
On the basis of the above embodiment, the technical solution is further described and optimized in this embodiment, and specifically, in this embodiment, after determining the target state of charge of the target battery according to the operation data and the peak power value, the method further includes:
acquiring an estimated state of charge of a target battery;
and when the estimated state of charge is inconsistent with the target state of charge, correcting the estimated state of charge by using the target state of charge.
Wherein, the estimated state of charge refers to the state of charge of the target battery calculated using an ampere-hour integration method (current integration method or coulomb counting method). In actual operation, the estimated state of charge of the target battery is obtained, whether the estimated state of charge is consistent with the target state of charge or not is compared, if not, an error exists in the estimated state of charge, and therefore the estimated state of charge is corrected by using the target state of charge; if so, it means that the estimated state of charge is accurate, and therefore no additional operations are performed.
It should be noted that, after the estimated state of charge of the target battery is obtained, a difference between the estimated state of charge and the target state of charge may be further calculated, and when the difference is greater than a preset state threshold, the estimated state of charge is corrected by using the target state of charge, that is, the corrected state of charge is determined according to the target state of charge, and the corrected state of charge is taken as the state of charge of the target battery. For example, when the estimated state of charge is 60% and the target state of charge is 30%, the difference between the estimated state of charge and the target state of charge is greater than the preset state threshold value by 20%, so that the estimated state of charge is corrected by using the target state of charge, that is, the corrected state of charge is determined to be 35% according to the target state of charge, and the 35% state of charge is taken as the state of charge of the target battery.
Therefore, the embodiment further uses the target state of charge to correct and estimate the state of charge, so that the battery state of charge can be corrected conveniently and accurately.
In a specific embodiment, after estimating the state of charge using the target state of charge correction, the method further comprises:
generating and pushing state of charge correction information; the state of charge correction information characterizes a correction to the estimated state of charge.
Specifically, in the present embodiment, the state of charge correction information is generated after the estimated state of charge is corrected by the target state of charge, that is, after the estimated state of charge is modified. The state of charge correction information is used for prompting the current correction of the estimated state of charge, and the state of charge correction information can comprise the estimated state of charge, the target state of charge and the corrected state of charge.
After the state of charge correction information is generated, pushing the state of charge correction information to a preset prompting device, and continuously sending a corresponding signal through the prompting device so as to prompt a user to correct the estimated state of charge currently. The prompting device comprises a buzzer, an indicator light, a voice player or a display and the like, and the corresponding signals comprise continuous buzzing, flickering of the indicator light, voice information, displayed characters and the like.
Therefore, in the embodiment, after the estimated state of charge is corrected by using the target state of charge, the state of charge correction information is generated and pushed, so that the user can be conveniently and intuitively prompted to correct the estimated state of charge at present, and the use experience of the user is improved.
In order to enable those skilled in the art to better understand the technical solutions in the present application, the following details are provided for the technical solutions in the embodiments of the present application in conjunction with a practical application scenario. In the embodiment of the application, the target battery is a power battery in a new energy automobile, and the specific steps of a method for determining the state of charge of the battery are as follows:
step 1: in the operation process of the target battery, the battery management system acquires operation data of each time point every second; the operation data includes a charging power Pcha, a discharging power Pdch, a maximum cell voltage Vmax, a minimum cell voltage Vmin, a module maximum temperature Tmax, and a module minimum temperature Tmin;
step 2: storing the operation data in 10s, and updating the operation data in 10s with a period of 1 s;
step 3: whether the power of the target battery maintains the steady state for a preset time period or not (judging condition 1);
step 4: if yes, acquiring a voltage threshold corresponding to the charge and discharge states of the target battery;
step 5: at a preset time, acquiring a voltage value corresponding to the charge and discharge state of the target battery, and judging whether the voltage value reaches a voltage threshold (judging condition 2):
during charging, obtaining the maximum monomer voltage Vmax, and judging whether the maximum monomer voltage Vmax is within [ Vmaxset-0.1V, vmaxset+0.1V ];
during discharging, obtaining the minimum monomer voltage Vmin, and judging whether the minimum monomer voltage Vmin is within [ Vminset-0.1V, vminset+0.1V ]; wherein, vminset is the lower limit voltage value, and Vmaxset is the upper limit voltage value;
step 6: if the judging condition 1 and the judging condition 2 are simultaneously met, determining the target state of charge of the target battery according to the operation data and the peak power value:
during charging, according to [ PCH, tmax, tmin ] inverse checking power meter, obtaining a maximum value SOCmax and a minimum value SOCmin of the charging state, and taking a larger value as a target charging state;
during discharging, according to [ Pdch, tmax, tmin ] inverse checking power meter, obtaining a discharge state maximum value SOCmax and a discharge state minimum value SOCmin, and taking a smaller value as a target state of charge;
step 7: acquiring an estimated state of charge of a target battery;
step 8: when the difference between the estimated state of charge and the target state of charge is greater than a preset state threshold, the estimated state of charge is corrected using the target state of charge.
According to the method for determining the battery state of charge, which is provided by the embodiment of the application, operation data corresponding to each time point in the operation process of the target battery are obtained; judging whether the power value of the target battery at the preset time is a peak power value or not according to each operation data; if yes, determining the target state of charge of the target battery according to the operation data and the peak power value. According to the scheme, the corresponding target state of charge is determined according to the operation data in the operation process of the target battery, namely, the target state of charge of the target battery can be determined in the operation process of the battery, so that the convenience in determining the state of charge of the battery is improved.
It should be understood that the sequence number of each step in the foregoing embodiment does not mean that the execution sequence of each process should be determined by the function and the internal logic of each process, and should not limit the implementation process of the embodiment of the present application in any way.
Fig. 4 is a schematic structural diagram of a device for determining a state of charge of a battery according to an embodiment of the present application. As shown in fig. 4, the battery state of charge determining apparatus of this embodiment includes an acquisition module 401, a judgment module 402, and an execution module 403; wherein,
an obtaining module 401, configured to obtain operation data corresponding to each time point in the operation process of the target battery;
a judging module 402, configured to judge whether the power value of the target battery at the preset time is a peak power value according to each operation data; if yes, calling an execution module 403;
an execution module 403 is configured to determine a target state of charge of the target battery based on the operation data and the peak power value.
The device for determining the battery state of charge provided by the embodiment of the application has the same beneficial effects as the method for determining the battery state of charge.
In one embodiment, the determining module 402 includes:
the first judging sub-module is used for judging whether the duration of maintaining the power of the target battery in a stable state reaches a preset duration or not according to each operation data; if so, calling a second judging sub-module;
the second judging submodule is used for judging whether the voltage value of the target battery at the preset moment reaches a corresponding voltage threshold value or not; the preset time is the time corresponding to the time when the power of the target battery maintains the stable state and reaches the preset time; if so, judging the power value of the target battery at the preset time as the peak power value.
In one embodiment, the second judgment submodule includes:
a determining unit configured to determine a voltage threshold according to a charge-discharge state of the target battery;
and the acquisition unit is used for acquiring the voltage value of the target battery according to the charge and discharge state of the target battery at the preset moment and judging whether the voltage value reaches the voltage threshold value or not.
In one embodiment, the execution module 403 includes:
and the execution sub-module is used for inquiring a preset power meter according to the peak power value, the highest temperature of the module and the lowest temperature of the module to obtain the target state of charge of the target battery.
In one embodiment, a device for determining a state of charge of a battery further includes:
the data acquisition module is used for acquiring the estimated state of charge of the target battery;
and the correction module is used for correcting the estimated state of charge by using the target state of charge when the estimated state of charge is inconsistent with the target state of charge.
In one embodiment, a device for determining a state of charge of a battery further includes:
the prompting module is used for generating and pushing the charge state correction information; the state of charge correction information characterizes a correction to the estimated state of charge.
It should be noted that, because the content of information interaction and execution process between the above devices/units is based on the same concept as the method embodiment of the present application, specific functions and technical effects thereof may be referred to in the method embodiment section, and will not be described herein again.
It will be apparent to those skilled in the art that, for convenience and brevity of description, only the above-described division of the functional units and modules is illustrated, and in practical application, the above-described functional distribution may be performed by different functional units and modules according to needs, i.e. the internal structure of the apparatus is divided into different functional units or modules to perform all or part of the above-described functions. The functional units and modules in the embodiment may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit, where the integrated units may be implemented in a form of hardware or a form of a software functional unit. In addition, specific names of the functional units and modules are only for convenience of distinguishing from each other, and are not used for limiting the protection scope of the present application. The specific working process of the units and modules in the above system may refer to the corresponding process in the foregoing method embodiment, which is not described herein again.
Fig. 5 is a schematic structural diagram of a terminal device according to an embodiment of the present application. As shown in fig. 5, the terminal device 500 of this embodiment includes a memory 501, a processor 502, and a computer program 503 stored in the memory 503 and executable on the processor 502; the processor 502, when executing the computer program 503, implements the steps in the above-described embodiments of the method for determining the state of charge of each battery, such as S100 to S300 shown in fig. 1; or the processor 502 may perform the functions of the modules/units in the above-described apparatus embodiments when executing the computer program 503, for example, the functions of the acquisition module, the judgment module, and the execution module shown in fig. 4.
By way of example, the computer program 503 may be partitioned into one or more modules/units, which are stored in the memory 501 and executed by the processor 502 to implement the methods of the embodiments of the present application. One or more of the modules/units may be a series of computer program instruction segments capable of performing a specific function for describing the execution of the computer program 503 in the terminal device 500. For example, the computer program 503 may be divided into an acquisition module, a judgment module, and an execution module, each of which specifically functions as follows:
the acquisition module is used for acquiring operation data corresponding to each time point in the operation process of the target battery;
the judging module is used for judging whether the power value of the target battery at the preset moment is a peak power value or not according to the operation data; if yes, calling an execution module;
and the execution module is used for determining the target state of charge of the target battery according to the operation data and the peak power value.
In application, the terminal device 500 may be a computing device such as a desktop computer, a notebook computer, a palm computer, and a cloud server. Terminal device 500 may include, but is not limited to, memory 501 and processor 502. It will be appreciated by those skilled in the art that fig. 5 is merely an example of a terminal device and is not meant to be limiting, and may include more or fewer components than shown, or may combine certain components, or different components, e.g., a terminal device may also include an input-output device, a network access device, a bus, etc.; the input and output equipment can comprise a camera, an audio acquisition/play device, a display screen and the like; the network access device may include a communication module for wireless communication with an external device.
In application, the processor may be a central processing unit (Central Processing Unit, CPU), or other general purpose processor, digital signal processor (Digital Signal Processor, DSP), application specific integrated circuit (Application Specific Integrated Circuit, ASIC), off-the-shelf programmable gate array (Field-Programmable Gate Array, FPGA) or other programmable logic device, discrete gate or transistor logic device, discrete hardware components, or the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
In an application, the memory may be an internal storage unit of the terminal device, such as a hard disk or a memory of the terminal device; external storage devices of the terminal device, for example, a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card) and the like, which are provided on the terminal device; it may also comprise both an internal memory unit of the terminal device and an external memory device. The memory is used to store an operating system, application programs, boot Loader (Boot Loader), data, and other programs, etc., such as program code for a computer program, etc. The memory may also be used to temporarily store data that has been output or is to be output.
The embodiment of the application also provides a power battery, which comprises a battery management system, wherein the battery management system can realize the steps in the method embodiments when in operation.
The power battery provided by the embodiment of the application has the same beneficial effects as the method for determining the state of charge of the battery.
The embodiment of the application also provides a vehicle, which comprises a vehicle body and a controller, wherein the controller executes the steps of the method.
The vehicle provided by the embodiment of the application has the same beneficial effects as the method for determining the state of charge of the battery.
The embodiments of the present application also provide a computer readable storage medium storing a computer program, where the computer program can implement the steps in the above-mentioned method embodiments when executed by a processor.
The computer readable storage medium provided in the embodiments of the present application has the same advantages as the above-described method for determining a battery state of charge.
The present application also provides a computer program product. The computer program product comprises a computer program which, when executed by a processor, implements the steps of the various method embodiments described above.
The computer program product provided by the embodiment of the application has the same beneficial effects as the method for determining the state of charge of the battery.
All or part of the process in the method of the above embodiments may be implemented by a computer program, which may be stored in a computer readable storage medium and which, when executed by a processor, implements the steps of the method embodiments described above. Wherein the computer program comprises computer program code which may be in source code form, object code form, executable file or some intermediate form etc. The computer readable medium may include at least: any entity or device capable of carrying computer program code to a terminal device, a recording medium, a computer Memory, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), an electrical carrier signal, a telecommunication signal, and a software distribution medium. Such as a U-disk, removable hard disk, magnetic or optical disk, etc.
In the foregoing embodiments, the descriptions of the embodiments are emphasized, and in part, not described or illustrated in any particular embodiment, reference is made to the related descriptions of other embodiments.
Those of ordinary skill in the art will appreciate that the various illustrative apparatus and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other manners. For example, the embodiments of the apparatus described above are illustrative only, and the coupling or direct coupling or communication connection shown or discussed with each other may be through some interfaces, the apparatus may be indirectly coupled or in communication connection, whether in electrical, mechanical or other form.
The above embodiments are only for illustrating the technical solution of the present application, and are not limiting; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present application, and are intended to be included in the scope of the present application.
Claims (10)
1. A method of determining a state of charge of a battery, the method comprising:
acquiring operation data corresponding to each time point in the operation process of the target battery;
judging whether the power value of the target battery at the preset moment is a peak power value or not according to each operation data;
if yes, determining the target state of charge of the target battery according to the operation data and the peak power value.
2. The method of claim 1, wherein determining whether the power value of the target battery at the preset time is a peak power value according to each of the operation data comprises:
judging whether the duration of maintaining the power of the target battery in a stable state reaches a preset duration or not according to each operation data;
if so, judging whether the voltage value of the target battery at the preset moment reaches a corresponding voltage threshold value; the preset time is the time corresponding to the time when the power of the target battery maintains the stable state and reaches the preset time;
if yes, judging the power value of the target battery at the preset time as a peak power value.
3. The method according to claim 2, wherein the determining whether the voltage value of the target battery reaches the corresponding voltage threshold at the preset time includes:
determining a voltage threshold according to the charge and discharge state of the target battery;
and at the preset moment, acquiring a voltage value of the target battery according to the charge and discharge state of the target battery, and judging whether the voltage value reaches the voltage threshold.
4. The method of claim 1, wherein said determining a target state of charge of said target battery from said operational data and said peak power value comprises:
and inquiring a preset power meter according to the peak power value, the module highest temperature and the module lowest temperature to obtain the target state of charge of the target battery.
5. The method according to any one of claims 1 to 4, characterized in that after said determining a target state of charge of said target battery from said operation data and said peak power value, said method further comprises:
acquiring an estimated state of charge of the target battery;
and correcting the estimated state of charge by using the target state of charge when the estimated state of charge is inconsistent with the target state of charge.
6. The method of claim 5, wherein after said correcting said estimated state of charge with said target state of charge, said method further comprises:
generating and pushing state of charge correction information; the state of charge correction information characterizes a correction to the estimated state of charge.
7. A battery state of charge determining apparatus, the apparatus comprising:
the acquisition module is used for acquiring operation data corresponding to each time point in the operation process of the target battery;
the judging module is used for judging whether the power value of the target battery at the preset moment is a peak power value or not according to the operation data; if yes, calling an execution module;
the execution module is used for determining the target state of charge of the target battery according to the operation data and the peak power value.
8. A terminal device comprising a memory, a processor and a computer program stored in the memory and executable on the processor, characterized in that the processor implements the steps of the method according to any of claims 1 to 6 when the computer program is executed.
9. A power cell comprising a battery management system, wherein the battery management system performs the steps of the method of any one of claims 1 to 6 when in operation.
10. A vehicle comprising a vehicle body, characterized by further comprising a controller that performs the steps of the method of any one of claims 1 to 6.
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| CN202211056247.6A CN117656933A (en) | 2022-08-31 | 2022-08-31 | Battery charge state determining method and device, terminal equipment and power battery |
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| CN202211056247.6A CN117656933A (en) | 2022-08-31 | 2022-08-31 | Battery charge state determining method and device, terminal equipment and power battery |
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