CN111880106A - Battery state of charge detection method, equipment, storage medium and device - Google Patents
Battery state of charge detection method, equipment, storage medium and device Download PDFInfo
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- CN111880106A CN111880106A CN202010776026.0A CN202010776026A CN111880106A CN 111880106 A CN111880106 A CN 111880106A CN 202010776026 A CN202010776026 A CN 202010776026A CN 111880106 A CN111880106 A CN 111880106A
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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]
- G01R31/382—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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
- B60L58/12—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries responding to state of charge [SoC]
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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]
- G01R31/396—Acquisition or processing of data for testing or for monitoring individual cells or groups of cells within a battery
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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
Abstract
The invention discloses a battery state-of-charge detection method, equipment, a storage medium and a device, compared with the existing mode of directly estimating the battery state-of-charge by an ampere-hour integration method, firstly, the current, the current voltage, the current temperature and the initial state of charge of a battery to be detected are obtained, the method comprises the steps of determining a current voltage difference value of a battery to be detected according to current, current voltage, current temperature and an initial charge state, determining a current correction value according to the initial charge state and the current voltage difference value, and determining the current charge state of the battery to be detected according to the current, the current correction value and the initial charge state.
Description
Technical Field
The invention relates to the technical field of automobiles, in particular to a battery state of charge detection method, equipment, a storage medium and a device.
Background
At present, in a hybrid electric vehicle, a 48V power battery is one of core components, the reliability and the service life of the battery are important factors influencing the performance of a hybrid system, and the high-cold, high-temperature, congestion, rapid acceleration and deceleration working conditions of the vehicle have large challenges on a power battery management system, and an accurate and reliable State of charge (SOC) estimation method can maximally exert the potential of the battery, avoid battery abuse and improve the service life of the battery and the robustness of the hybrid system.
The ampere-hour integral method is the most widely applied and simple SOC estimation method at present. In the working process of the battery, the charging and discharging current of the battery is subjected to time integration operation, and then the dynamic SOC of the battery is estimated. The ampere-hour integration method has high requirements on current sampling precision, otherwise, a large accumulated error can be generated after long-time operation. There is also a method in which an open circuit voltage method and an ampere-hour integration method are combined. The SOC error accumulated by ampere-hour integration after the battery has been operated for a long time is large, and the SOC needs to be corrected by using the open-circuit voltage after the battery has been sufficiently left still. Because the lithium iron phosphate battery has a long charging and discharging platform interval, after the battery is sufficiently stood, if the voltage of a single body is within the range of the platform interval, the SOC cannot be accurately corrected. Particularly, when the lithium iron phosphate battery is applied to a hybrid vehicle, the SOC use interval of the battery of the hybrid vehicle is basically overlapped with the platform interval of the lithium iron phosphate battery, and the accumulated SOC error of the hybrid vehicle after long-time running is larger and larger, so that the actual application requirements of the vehicle cannot be met.
The above is only for the purpose of assisting understanding of the technical aspects of the present invention, and does not represent an admission that the above is prior art.
Disclosure of Invention
The invention mainly aims to provide a battery state of charge detection method, equipment, a storage medium and a device, and aims to solve the technical problem of how to accurately detect the battery state of charge.
In order to achieve the above object, the present invention provides a battery state of charge detection method, including the steps of:
acquiring the current, the current voltage, the current temperature and the initial state of charge of a battery to be detected;
determining a current voltage difference value of the battery to be detected according to the current, the current voltage, the current temperature and the initial state of charge;
determining a current correction value according to the initial state of charge and the current voltage difference value;
and determining the current state of charge of the battery to be detected according to the current, the current correction value and the initial state of charge.
Preferably, the step of determining the current voltage difference of the battery to be detected according to the current, the current voltage, the current temperature and the initial state of charge specifically includes:
determining the estimated single open-circuit voltage of the battery to be detected according to the current, the current voltage, the current temperature and the initial state of charge;
determining the actual single open-circuit voltage of the battery to be detected according to the current temperature and the initial state of charge;
and determining the current voltage difference value according to the estimated monomer open-circuit voltage and the actual monomer open-circuit voltage.
Preferably, the step of determining the actual cell open-circuit voltage of the battery to be detected according to the current temperature and the initial state of charge specifically includes:
taking the current temperature and the initial state of charge as actual key information;
and searching actual monomer open-circuit voltage corresponding to the actual key information in a preset voltage relation table, wherein the preset voltage relation table comprises the corresponding relation between the actual key information and the actual monomer open-circuit voltage.
Preferably, the step of determining a current correction value according to the initial state of charge and the current voltage difference value specifically includes:
obtaining a polarization voltage value and a current charge and discharge state of a battery to be detected;
and determining a current correction value according to the current charging and discharging state, the initial charge state, the current voltage difference value and the polarization voltage value.
Preferably, the step of determining a current correction value according to the current charge-discharge state, the initial charge state, the current voltage difference value, and the polarization voltage value specifically includes:
determining a current correction weight according to the current charge-discharge state, the initial charge state, the current voltage difference value and the polarization voltage value;
and determining a current correction value according to the current voltage difference value and the current correction weight.
Preferably, the step of determining the current state of charge of the battery to be detected according to the current, the current correction value and the initial state of charge specifically includes:
determining a pre-estimated state of charge through a preset ampere-hour integral model according to the current;
and determining the current state of charge of the battery to be detected according to the estimated state of charge, the current correction value and the initial state of charge.
Preferably, after the step of determining the current state of charge of the battery to be detected according to the current, the current correction value and the initial state of charge, the battery state of charge detection method further includes:
determining the current residual capacity of the battery to be detected according to the current state of charge, and searching an early warning strategy corresponding to the current residual capacity;
and generating early warning information according to the early warning strategy, and sending the early warning information to a target client.
In addition, to achieve the above object, the present invention further provides a battery state of charge detection apparatus, which includes a memory, a processor, and a battery state of charge detection program stored in the memory and operable on the processor, wherein the battery state of charge detection program is configured to implement the steps of the battery state of charge detection method as described above.
In addition, to achieve the above object, the present invention further provides a storage medium having a battery state of charge detection program stored thereon, wherein the battery state of charge detection program, when executed by a processor, implements the steps of the battery state of charge detection method as described above.
In addition, in order to achieve the above object, the present invention also provides a battery state of charge detection apparatus, including: the device comprises an acquisition module, a determination module and a detection module;
the acquisition module is used for acquiring the current, the current voltage, the current temperature and the initial state of charge of the battery to be detected;
the determining module is used for determining a current voltage difference value of the battery to be detected according to the current, the current voltage, the current temperature and the initial state of charge;
the determining module is further configured to determine a current correction value according to the initial state of charge and the current voltage difference value;
the detection module is used for determining the current state of charge of the battery to be detected according to the current, the current correction value and the initial state of charge.
The method comprises the steps of obtaining the current, the current voltage, the current temperature and the initial state of charge of a battery to be detected, determining the current voltage difference value of the battery to be detected according to the current, the current voltage, the current temperature and the initial state of charge, determining the current correction value according to the initial state of charge and the current voltage difference value, and determining the current state of charge of the battery to be detected according to the current, the current correction value and the initial state of charge; compared with the existing mode of directly estimating the state of charge of the battery through an ampere-hour integration method, the method and the device have the advantages that the current correction value of the battery to be detected is determined according to the current, the current voltage, the current temperature and the initial state of charge, the current state of charge of the battery to be detected is determined according to the current, the current correction value and the initial state of charge, the detection result of the state of charge of the battery is more accurate, the defect that the state of charge of the battery cannot be accurately corrected in the prior art is overcome, and therefore the state of charge of the battery can be accurately detected, and the actual.
Drawings
Fig. 1 is a schematic structural diagram of a battery state of charge detection device in a hardware operating environment according to an embodiment of the present invention;
FIG. 2 is a schematic flow chart illustrating a method for detecting the state of charge of a battery according to a first embodiment of the present invention;
FIG. 3 is a flowchart illustrating a second embodiment of a battery SOC detection method according to the present invention;
fig. 4 is a block diagram of a first embodiment of a battery state of charge detection apparatus according to the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a battery state of charge detection device in a hardware operating environment according to an embodiment of the present invention.
As shown in fig. 1, the battery state of charge detection apparatus may include: a processor 1001, such as a Central Processing Unit (CPU), a communication bus 1002, a user interface 1003, a network interface 1004, and a memory 1005. Wherein a communication bus 1002 is used to enable connective communication between these components. The user interface 1003 may include a Display screen (Display), and the optional user interface 1003 may further include a standard wired interface and a wireless interface, and the wired interface for the user interface 1003 may be a USB interface in the present invention. The network interface 1004 may optionally include a standard wired interface, a WIreless interface (e.g., a WIreless-FIdelity (WI-FI) interface). The Memory 1005 may be a Random Access Memory (RAM) Memory or a Non-volatile Memory (NVM), such as a disk Memory. The memory 1005 may alternatively be a storage device separate from the processor 1001.
Those skilled in the art will appreciate that the configuration shown in fig. 1 does not constitute a limitation of the battery state of charge detection apparatus and may include more or fewer components than shown, or some components in combination, or a different arrangement of components.
As shown in fig. 1, memory 1005, identified as one type of computer storage medium, may include an operating system, a network communication module, a user interface module, and a battery state of charge detection program.
In the battery state of charge detection apparatus shown in fig. 1, the network interface 1004 is mainly used for connecting to a background server and performing data communication with the background server; the user interface 1003 is mainly used for connecting user equipment; the battery state of charge detection device calls a battery state of charge detection program stored in the memory 1005 through the processor 1001, and executes the battery state of charge detection method provided by the embodiment of the present invention.
Based on the hardware structure, the embodiment of the battery state of charge detection method is provided.
Referring to fig. 2, fig. 2 is a schematic flow chart of a battery state of charge detection method according to a first embodiment of the present invention, and provides the battery state of charge detection method according to the first embodiment of the present invention.
Step S10: and acquiring the current, the current voltage, the current temperature and the initial state of charge of the battery to be detected.
It should be noted that the execution main body of the embodiment is the battery state of charge detection device, where the battery state of charge detection device may be an electronic device such as a vehicle-mounted computer and a server, or may also be another device that can achieve the same or similar functions.
It should be noted that the battery to be detected may be a power battery of a hybrid electric vehicle or a pure electric vehicle, in this embodiment, a 48V power battery is taken as an example for description, and this embodiment is not limited to this; the current can be the current value of the battery to be detected at the current moment; the current voltage can be the voltage value of the battery to be detected at the current moment; the current temperature can be the temperature value of the battery to be detected at the current moment; the initial state of charge may be a state of charge that was obtained the previous time the battery state of charge detection method was performed.
It should be understood that the obtaining of the current, the current voltage, and the current temperature of the battery to be detected may be collecting the current, the current voltage, and the current temperature of the battery to be detected through a Controller Area Network (CAN) bus; the obtaining of the initial state of charge of the battery to be detected may be obtaining, in a preset database, the initial state of charge stored when the battery state of charge detection method was executed last time, where the preset database may be set according to a user requirement, and this embodiment is not limited to this.
Step S20: and determining the current voltage difference value of the battery to be detected according to the current, the current voltage, the current temperature and the initial state of charge.
It should be understood that determining the current voltage difference of the battery to be detected according to the current, the current voltage, the current temperature and the initial state of charge may be determining an estimated cell open-circuit voltage of the battery to be detected according to the current, the current voltage, the current temperature and the initial state of charge, determining an actual cell open-circuit voltage of the battery to be detected according to the current temperature and the initial state of charge, and determining the current voltage difference according to the estimated cell open-circuit voltage and the actual cell open-circuit voltage.
It should be noted that the battery to be detected may be a battery formed by connecting a plurality of single batteries in series, and the single open-circuit voltage may be an open-circuit voltage value of each single battery forming the battery to be detected.
It should be understood that determining the estimated cell open-circuit voltage of the battery to be detected according to the current, the current voltage, the current temperature and the initial state of charge may be determining the estimated cell open-circuit voltage of the battery to be detected through a preset battery simulation model according to the current, the current voltage, the current temperature and the initial state of charge.
It should be noted that the preset battery simulation model may be obtained by first selecting a first-order RC model as an initial battery simulation model, then performing parameter identification through a pulse discharge experiment and a least square method, and after the parameter identification is completed, the preset battery simulation model is obtained, where the first-order RC model may be a donning weinan model, and this embodiment is not limited thereto.
It should be understood that, the determining of the actual cell open-circuit voltage of the battery to be detected according to the current temperature and the initial state of charge may be to use the current temperature and the initial state of charge as actual key information, and search an actual cell open-circuit voltage corresponding to the actual key information in a preset voltage relationship table, where the preset voltage relationship table includes a correspondence between the actual key information and the actual cell open-circuit voltage.
It should be noted that the corresponding relationship may be a data relationship table between the SOC and an Open Circuit Voltage (OCV), where the data relationship table may be preset according to a test result, and this embodiment is not limited thereto.
Step S30: and determining a current correction value according to the initial state of charge and the current voltage difference value.
It can be understood that, the determining of the current correction value according to the initial state of charge and the current voltage difference value may be obtaining a polarization voltage value and a current charge-discharge state of the battery to be detected, and determining the current correction value according to the current charge-discharge state, the initial state of charge, the current voltage difference value and the polarization voltage value.
Polarization may be a phenomenon in which an electrode is deviated from a balanced electrode potential when a current flows through the battery, and is referred to as electrode polarization. The polarization phenomenon breaks the balance of potential (voltage), and is therefore voltage polarization. The voltage value generated by the voltage polarization may be as a polarization voltage value; the current charge-discharge state may be a charge state or a non-charge state of the battery to be detected.
Step S40: and determining the current state of charge of the battery to be detected according to the current, the current correction value and the initial state of charge.
It should be understood that the determining the current state of charge of the battery to be detected according to the current, the current correction value and the initial state of charge may be determining an estimated state of charge through a preset ampere-hour integral model according to the current, and determining the current state of charge of the battery to be detected according to the estimated state of charge, the current correction value and the initial state of charge.
It should be noted that the preset ampere-hour integral model may be an ampere-hour integral method; the estimated state of charge may be a state of charge obtained by an ampere-hour integration method from a current value at the present time.
It should be appreciated that determining the estimated state of charge from the current via a predetermined ampere-hour integral model may be calculating the estimated state of charge from the current via an ampere-hour integral method.
It should be understood that, the determining the current state of charge of the battery to be detected according to the estimated state of charge, the current correction value and the initial state of charge may be adding the estimated state of charge, the current correction value and the initial state of charge to obtain the current state of charge of the battery to be detected.
In a first embodiment, a current, a current voltage, a current temperature and an initial state of charge of a battery to be detected are obtained, a current voltage difference value of the battery to be detected is determined according to the current, the current voltage, the current temperature and the initial state of charge, a current correction value is determined according to the initial state of charge and the current voltage difference value, and the current state of charge of the battery to be detected is determined according to the current, the current correction value and the initial state of charge; compared with the existing mode of directly estimating the state of charge of the battery through an ampere-hour integration method, the method has the advantages that the current correction value of the battery to be detected is determined according to the current, the current voltage, the current temperature and the initial state of charge, the current state of charge of the battery to be detected is determined according to the current, the current correction value and the initial state of charge, the detection result of the state of charge of the battery is more accurate, the defect that the state of charge of the battery cannot be accurately corrected in the prior art is overcome, and therefore the state of charge of the battery can be accurately detected, and the actual application requirements are met.
Referring to fig. 3, fig. 3 is a flowchart illustrating a second embodiment of the battery soc detection method according to the present invention, and the second embodiment of the battery soc detection method according to the present invention is proposed based on the first embodiment shown in fig. 2.
In the second embodiment, the step S20 includes:
step S201: and determining the estimated single open-circuit voltage of the battery to be detected according to the current, the current voltage, the current temperature and the initial state of charge.
It should be noted that the battery to be detected may be a battery formed by connecting a plurality of single batteries in series, and the single open-circuit voltage may be an open-circuit voltage value of each single battery forming the battery to be detected.
It should be understood that determining the estimated cell open-circuit voltage of the battery to be detected according to the current, the current voltage, the current temperature and the initial state of charge may be determining the estimated cell open-circuit voltage of the battery to be detected through a preset battery simulation model according to the current, the current voltage, the current temperature and the initial state of charge.
It should be noted that the preset battery simulation model may be obtained by first selecting a first-order RC model as an initial battery simulation model, then performing parameter identification through a pulse discharge experiment and a least square method, and after the parameter identification is completed, the preset battery simulation model is obtained, where the first-order RC model may be a donning weinan model, and this embodiment is not limited thereto.
Step S202: and determining the actual single open-circuit voltage of the battery to be detected according to the current temperature and the initial state of charge.
It should be understood that, determining the actual cell open-circuit voltage of the battery to be detected according to the current temperature and the initial state of charge may be directly searching for the actual cell open-circuit voltage corresponding to the current temperature and the initial state of charge.
Further, in consideration of practical application, if the actual single open-circuit voltage of the battery to be detected is directly determined according to the current temperature and the initial state of charge, the accuracy of a calculation result is inevitably low, and the state of charge detection result is influenced. To overcome this drawback, step S202 includes:
taking the current temperature and the initial state of charge as actual key information;
and searching actual monomer open-circuit voltage corresponding to the actual key information in a preset voltage relation table, wherein the preset voltage relation table comprises the corresponding relation between the actual key information and the actual monomer open-circuit voltage.
It should be noted that the corresponding relationship may be a data relationship table between the SOC and an Open Circuit Voltage (OCV), where the data relationship table may be preset according to a test result, and this embodiment is not limited thereto.
Step S203: and determining the current voltage difference value according to the estimated monomer open-circuit voltage and the actual monomer open-circuit voltage.
It should be appreciated that determining the current voltage difference from the predicted cell open circuit voltage and the actual cell open circuit voltage may be calculating a difference between the predicted cell open circuit voltage and the actual cell open circuit voltage and taking the difference as the current voltage difference.
In a second embodiment, an estimated single open-circuit voltage of the battery to be detected is determined according to the current, the current voltage, the current temperature and the initial state of charge, an actual single open-circuit voltage of the battery to be detected is determined according to the current temperature and the initial state of charge, and a current voltage difference value is determined according to the estimated single open-circuit voltage and the actual single open-circuit voltage; in the embodiment, the estimated monomer open-circuit voltage is determined according to the current, the current voltage, the current temperature and the initial state of charge, the actual monomer open-circuit voltage is determined according to the current temperature and the initial state of charge, and the current voltage difference value is determined according to the estimated monomer open-circuit voltage and the actual monomer open-circuit voltage, so that the estimated monomer open-circuit voltage and the actual monomer open-circuit voltage can be calculated accurately and quickly, and the difference value between the estimated monomer open-circuit voltage and the actual monomer open-circuit voltage.
In the second embodiment, the step S30 includes:
step S301: and acquiring the polarization voltage value and the current charge and discharge state of the battery to be detected.
Polarization may be a phenomenon in which an electrode is deviated from a balanced electrode potential when a current flows through the battery, and is referred to as electrode polarization. The polarization phenomenon breaks the balance of potential (voltage), and is therefore voltage polarization. The voltage value generated by the voltage polarization may be as a polarization voltage value; the current charge-discharge state may be a charge state or a non-charge state of the battery to be detected.
It CAN be understood that the obtaining of the polarization voltage value and the current charge-discharge state of the battery to be detected may be obtaining the polarization voltage value and the charge-discharge identification bit of the battery to be detected through the CAN bus, and determining the current charge-discharge state of the battery to be detected according to the charge-discharge identification bit. For example, when the charge-discharge identification bit is 0, it can be determined that the battery to be detected is in a non-charged state; when the charging and discharging identification position is 1, the battery to be detected can be determined to be in a charging state.
Step S302: and determining a current correction value according to the current charging and discharging state, the initial charge state, the current voltage difference value and the polarization voltage value.
It should be understood that determining a current correction value based on the current charge-discharge state, the initial state of charge, the current voltage difference value, and the polarization voltage value may include determining a current correction weight based on the current charge-discharge state, the initial state of charge, the current voltage difference value, and the polarization voltage value, and determining a current correction value based on the current voltage difference value and the current correction weight
Further, in consideration of practical application, if the current correction value is directly determined according to the current charge-discharge state, the initial charge state, the current voltage difference value and the polarization voltage value, the calculation result is inevitably inaccurate, and the user requirements cannot be met. To overcome this drawback, step S302 includes:
determining a current correction weight according to the current charge-discharge state, the initial charge state, the current voltage difference value and the polarization voltage value;
and determining a current correction value according to the current voltage difference value and the current correction weight.
It should be noted that the current correction weight may be a value obtained by correcting the voltage difference.
In this embodiment, the current correction weight may be determined through the following six specific implementations, but the scope of the present invention is not limited:
1. selecting a weight coefficient W1 when the battery to be detected is in a charging state, the maximum monomer charge state is more than or equal to 97, or the minimum monomer charge state is less than 20, or the initial charge state is between 20 and 30 or the initial charge state is between 67 and 80;
2. when the battery to be detected is in a charging state, the maximum cell charge state is less than 97, the minimum cell charge state is more than or equal to 20, the initial charge state is not between 20 and 30, the initial charge state is not between 67 and 80, the current voltage difference value is more than 0.1V, the polarization voltage value is less than 10mV, and the current is less than or equal to 5A, the weight coefficient W2 is selected;
3. when the battery to be detected is in a charging state, the maximum monomer charge state is less than 97, the minimum monomer charge state is more than or equal to 20, the initial charge state is not between 20 and 30, the initial charge state is not between 67 and 80, the current voltage difference value is less than or equal to 0.1V, or the polarization voltage value is more than or equal to 10mV, or the current is more than 5A, the weight coefficient W3 is selected
4. Selecting a weight coefficient W4 when the battery to be detected is in a non-charging state and the minimum single body charge state is less than 20, or the initial charge state is between 0 and 42, or the initial charge state is between 67 and 85;
5. when the battery to be detected is in a non-charging state, the minimum monomer charge state is more than or equal to 20, the initial charge state is not between 0 and 42, the initial charge state is not between 67 and 85, the current voltage difference is more than 0.1V, the polarization voltage value is less than 10mV, and the current is less than or equal to 5A, selecting a weight coefficient W2;
6. and when the battery to be detected is in a non-charging state, the minimum cell charge state is more than or equal to 20, the initial charge state is not between 0 and 42, the initial charge state is not between 67 and 85, the current voltage difference is less than or equal to 0.1V, or the polarization voltage value is more than 10mV, or the current is more than 5A, selecting a weight coefficient W3.
It should be noted that the weighting coefficients W1, W2, and W3 may be preset according to user requirements, and this embodiment is not limited thereto.
It should be understood that determining the current correction value according to the current voltage difference value and the current correction weight may be multiplying the current voltage difference value by the current correction weight to obtain the current correction value.
In a second embodiment, a current correction value is determined according to a current charge-discharge state, the initial charge state, the current voltage difference value and the polarization voltage value by obtaining the polarization voltage value and the current charge-discharge state of the battery to be detected, so that the correction value can be determined quickly and accurately.
In the second embodiment, the step S40 includes:
step S401: and determining the estimated state of charge through a preset ampere-hour integral model according to the current.
It should be noted that the preset ampere-hour integral model may be an ampere-hour integral method; the estimated state of charge may be a state of charge obtained by an ampere-hour integration method from a current value at the present time.
It should be appreciated that determining the estimated state of charge from the current via a predetermined ampere-hour integral model may be calculating the estimated state of charge from the current via an ampere-hour integral method.
Step S402: and determining the current state of charge of the battery to be detected according to the estimated state of charge, the current correction value and the initial state of charge.
It should be noted that the current state of charge may be the state of charge at the current time.
It should be understood that, the determining the current state of charge of the battery to be detected according to the estimated state of charge, the current correction value and the initial state of charge may be adding the estimated state of charge, the current correction value and the initial state of charge to obtain the current state of charge of the battery to be detected.
In a second embodiment, an estimated state of charge is determined through a preset ampere-hour integral model according to the current, and the current state of charge of the battery to be detected is determined according to the estimated state of charge, the current correction value and the initial state of charge; according to the method and the device, the estimated state of charge is obtained by performing ampere-hour integration on the current, and the current state of charge of the battery to be detected is determined according to the estimated state of charge, the current correction value and the initial state of charge, so that the accuracy of state of charge detection can be improved.
In the second embodiment, after the step S40, the method further includes:
step S50: and determining the current residual capacity of the battery to be detected according to the current state of charge, and searching an early warning strategy corresponding to the current residual capacity.
It should be noted that the early warning policy may be a reminding policy for reminding a user of the current remaining power, and the early warning policy may be at least one of a voice alarm policy, a text alarm policy, and a signal lamp alarm policy, which is not limited in this embodiment.
It should be understood that, determining the current remaining capacity of the battery to be detected according to the current state of charge may be obtaining the total battery capacity of the battery to be detected, calculating the current remaining capacity of the battery to be detected according to the current state of charge and the total battery capacity through a preset charge calculation formula,
wherein, the preset charge calculation formula is as follows:
in the formula, SOC is the current state of charge of the battery to be detected, Q is the current residual capacity of the battery to be detected, and Q ismThe total electric quantity of the battery to be detected is obtained.
It can be understood that the searching for the early warning policy corresponding to the current remaining power may be searching for the early warning policy corresponding to the current remaining power in a preset mapping table, where the preset mapping table includes a corresponding relationship between the current remaining power and the early warning policy, and the corresponding relationship may be set according to an actual demand of a user.
Step S60: and generating early warning information according to the early warning strategy, and sending the early warning information to a target client.
It should be noted that the early warning information may be pre-stored early warning information corresponding to the early warning policy, for example, when the early warning policy is that the remaining power is too low, and a voice alarm is performed, the voice information "power is too low |)! "; the target client may be a terminal configured by a user for monitoring a battery state to be detected, for example, a vehicle-mounted computer, which is not limited in this embodiment.
It should be understood that the generation of the early warning information according to the early warning policy may be searching for early warning information corresponding to the early warning policy in a preset database; the sending of the warning information to the target client may be sending to the target client through at least one of a CAN bus, an internet of things, and 5G, which is not limited in this embodiment.
In a second embodiment, the current residual capacity of the battery to be detected is determined according to the current state of charge, an early warning strategy corresponding to the current residual capacity is searched, early warning information is generated according to the early warning strategy, and the early warning information is sent to a target client; according to the embodiment, the current residual capacity is determined according to the current charge state, the early warning information is generated according to the current residual capacity and is sent to the target client, so that the electric quantity early warning information can be generated in time, and the electric quantity early warning information is pushed to the target client.
In addition, an embodiment of the present invention further provides a storage medium, where a battery state of charge detection program is stored on the storage medium, and the battery state of charge detection program, when executed by a processor, implements the steps of the battery state of charge detection method described above.
In addition, referring to fig. 4, an embodiment of the present invention further provides a battery state of charge detection apparatus, where the battery state of charge detection apparatus includes: the device comprises an acquisition module 10, a determination module 20 and a detection module 30;
the obtaining module 10 is configured to obtain a current, a current voltage, a current temperature, and an initial state of charge of the battery to be detected.
It should be noted that the execution main body of the embodiment is the battery state of charge detection device, where the battery state of charge detection device may be an electronic device such as a vehicle-mounted computer and a server, or may also be another device that can achieve the same or similar functions.
It should be noted that the battery to be detected may be a power battery of a hybrid electric vehicle or a pure electric vehicle, in this embodiment, a 48V power battery is taken as an example for description, and this embodiment is not limited to this; the current can be the current value of the battery to be detected at the current moment; the current voltage can be the voltage value of the battery to be detected at the current moment; the current temperature can be the temperature value of the battery to be detected at the current moment; the initial state of charge may be a state of charge that was obtained the previous time the battery state of charge detection method was performed.
It should be understood that the obtaining of the current, the current voltage, and the current temperature of the battery to be detected may be collecting the current, the current voltage, and the current temperature of the battery to be detected through a Controller Area Network (CAN) bus; the obtaining of the initial state of charge of the battery to be detected may be obtaining, in a preset database, the initial state of charge stored when the battery state of charge detection method was executed last time, where the preset database may be set according to a user requirement, and this embodiment is not limited to this.
The determining module 20 is configured to determine a current voltage difference of the battery to be detected according to the current, the current voltage, the current temperature, and the initial state of charge.
It should be understood that determining the current voltage difference of the battery to be detected according to the current, the current voltage, the current temperature and the initial state of charge may be determining an estimated cell open-circuit voltage of the battery to be detected according to the current, the current voltage, the current temperature and the initial state of charge, determining an actual cell open-circuit voltage of the battery to be detected according to the current temperature and the initial state of charge, and determining the current voltage difference according to the estimated cell open-circuit voltage and the actual cell open-circuit voltage.
It should be noted that the battery to be detected may be a battery formed by connecting a plurality of single batteries in series, and the single open-circuit voltage may be an open-circuit voltage value of each single battery forming the battery to be detected.
It should be understood that determining the estimated cell open-circuit voltage of the battery to be detected according to the current, the current voltage, the current temperature and the initial state of charge may be determining the estimated cell open-circuit voltage of the battery to be detected through a preset battery simulation model according to the current, the current voltage, the current temperature and the initial state of charge.
It should be noted that the preset battery simulation model may be obtained by first selecting a first-order RC model as an initial battery simulation model, then performing parameter identification through a pulse discharge experiment and a least square method, and after the parameter identification is completed, the preset battery simulation model is obtained, where the first-order RC model may be a donning weinan model, and this embodiment is not limited thereto.
It should be understood that, the determining of the actual cell open-circuit voltage of the battery to be detected according to the current temperature and the initial state of charge may be to use the current temperature and the initial state of charge as actual key information, and search an actual cell open-circuit voltage corresponding to the actual key information in a preset voltage relationship table, where the preset voltage relationship table includes a correspondence between the actual key information and the actual cell open-circuit voltage.
It should be noted that the corresponding relationship may be a data relationship table between the SOC and an Open Circuit Voltage (OCV), where the data relationship table may be preset according to a test result, and this embodiment is not limited thereto.
The determining module 20 is further configured to determine a current correction value according to the initial state of charge and the current voltage difference value.
It can be understood that, the determining of the current correction value according to the initial state of charge and the current voltage difference value may be obtaining a polarization voltage value and a current charge-discharge state of the battery to be detected, and determining the current correction value according to the current charge-discharge state, the initial state of charge, the current voltage difference value and the polarization voltage value.
Polarization may be a phenomenon in which an electrode is deviated from a balanced electrode potential when a current flows through the battery, and is referred to as electrode polarization. The polarization phenomenon breaks the balance of potential (voltage), and is therefore voltage polarization. The voltage value generated by the voltage polarization may be as a polarization voltage value; the current charge-discharge state may be a charge state or a non-charge state of the battery to be detected.
The detection module 30 is configured to determine the current state of charge of the battery to be detected according to the current, the current correction value, and the initial state of charge.
It should be understood that the determining the current state of charge of the battery to be detected according to the current, the current correction value and the initial state of charge may be determining an estimated state of charge through a preset ampere-hour integral model according to the current, and determining the current state of charge of the battery to be detected according to the estimated state of charge, the current correction value and the initial state of charge.
It should be noted that the preset ampere-hour integral model may be an ampere-hour integral method; the estimated state of charge may be a state of charge obtained by an ampere-hour integration method from a current value at the present time.
It should be appreciated that determining the estimated state of charge from the current via a predetermined ampere-hour integral model may be calculating the estimated state of charge from the current via an ampere-hour integral method.
It should be understood that, the determining the current state of charge of the battery to be detected according to the estimated state of charge, the current correction value and the initial state of charge may be adding the estimated state of charge, the current correction value and the initial state of charge to obtain the current state of charge of the battery to be detected.
In this embodiment, a current, a current voltage, a current temperature, and an initial state of charge of a battery to be detected are obtained, a current voltage difference of the battery to be detected is determined according to the current, the current voltage, the current temperature, and the initial state of charge, a current correction value is determined according to the initial state of charge and the current voltage difference, and the current state of charge of the battery to be detected is determined according to the current, the current correction value, and the initial state of charge; compared with the existing mode of directly estimating the state of charge of the battery through an ampere-hour integration method, the method has the advantages that the current correction value of the battery to be detected is determined according to the current, the current voltage, the current temperature and the initial state of charge, the current state of charge of the battery to be detected is determined according to the current, the current correction value and the initial state of charge, the detection result of the state of charge of the battery is more accurate, the defect that the state of charge of the battery cannot be accurately corrected in the prior art is overcome, and therefore the state of charge of the battery can be accurately detected, and the actual application requirements are met.
In an embodiment, the determining module 20 is further configured to determine an estimated cell open-circuit voltage of the battery to be detected according to the current, the current voltage, the current temperature, and the initial state of charge; determining the actual single open-circuit voltage of the battery to be detected according to the current temperature and the initial state of charge; determining a current voltage difference value according to the estimated monomer open-circuit voltage and the actual monomer open-circuit voltage;
in an embodiment, the determining module 20 is further configured to use the current temperature and the initial state of charge as actual key information; searching actual monomer open-circuit voltage corresponding to the actual key information in a preset voltage relation table, wherein the preset voltage relation table comprises the corresponding relation between the actual key information and the actual monomer open-circuit voltage;
in an embodiment, the determining module 20 is further configured to update the preset voltage relationship table according to the current state of charge to obtain a current state of charge relationship table;
in an embodiment, the determining module 20 is further configured to obtain a polarization voltage value and a current charge-discharge state of the battery to be detected; determining a current correction value according to the current charge-discharge state, the initial charge state, the current voltage difference value and the polarization voltage value;
in an embodiment, the determining module 20 is further configured to determine a current correction weight according to the current charge-discharge state, the initial charge state, the current voltage difference value, and the polarization voltage value; determining a current correction value according to the current voltage difference value and the current correction weight;
in an embodiment, the detection module 30 is further configured to determine an estimated state of charge according to the current through a preset ampere-hour integral model; and determining the current state of charge of the battery to be detected according to the estimated state of charge, the current correction value and the initial state of charge.
Other embodiments or specific implementation manners of the battery state of charge detection device according to the present invention may refer to the above method embodiments, and are not described herein again.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a process, method, article, or system that comprises the element.
The above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments. In the unit claims enumerating several means, several of these means may be embodied by one and the same item of hardware. The use of the words first, second, third, etc. do not denote any order, but rather the words first, second, third, etc. are to be interpreted as names.
Through the above description of the embodiments, those skilled in the art will clearly understand that the method of the above embodiments can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware, but in many cases, the former is a better implementation manner. Based on such understanding, the technical solutions of the present invention may be substantially implemented or a part contributing to the prior art may be embodied in the form of a software product, where the computer software product is stored in a storage medium (e.g., a Read Only Memory (ROM)/Random Access Memory (RAM), a magnetic disk, an optical disk), and includes several instructions for enabling a terminal device (which may be a mobile phone, a computer, a server, an air conditioner, or a network device) to execute the method according to the embodiments of the present invention.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A battery state of charge detection method, characterized in that it comprises the following steps:
acquiring the current, the current voltage, the current temperature and the initial state of charge of a battery to be detected;
determining a current voltage difference value of the battery to be detected according to the current, the current voltage, the current temperature and the initial state of charge;
determining a current correction value according to the initial state of charge and the current voltage difference value;
and determining the current state of charge of the battery to be detected according to the current, the current correction value and the initial state of charge.
2. The battery state of charge detection method of claim 1, wherein said step of determining a current voltage difference of the battery to be detected according to the current, the current voltage, the current temperature, and the initial state of charge specifically comprises:
determining the estimated single open-circuit voltage of the battery to be detected according to the current, the current voltage, the current temperature and the initial state of charge;
determining the actual single open-circuit voltage of the battery to be detected according to the current temperature and the initial state of charge;
and determining the current voltage difference value according to the estimated monomer open-circuit voltage and the actual monomer open-circuit voltage.
3. The battery state of charge detection method according to claim 2, wherein the step of determining the actual cell open-circuit voltage of the battery to be detected according to the current temperature and the initial state of charge specifically comprises:
taking the current temperature and the initial state of charge as actual key information;
and searching actual monomer open-circuit voltage corresponding to the actual key information in a preset voltage relation table, wherein the preset voltage relation table comprises the corresponding relation between the actual key information and the actual monomer open-circuit voltage.
4. The battery state of charge detection method of claim 1, wherein said step of determining a current correction value based on said initial state of charge and said current voltage difference value comprises:
obtaining a polarization voltage value and a current charge and discharge state of a battery to be detected;
and determining a current correction value according to the current charging and discharging state, the initial charge state, the current voltage difference value and the polarization voltage value.
5. The battery state of charge detection method of claim 4, wherein said step of determining a current correction value based on said current charge-discharge state, said initial state of charge, said current voltage difference value, and said polarization voltage value, comprises:
determining a current correction weight according to the current charge-discharge state, the initial charge state, the current voltage difference value and the polarization voltage value;
and determining a current correction value according to the current voltage difference value and the current correction weight.
6. The battery state-of-charge detection method according to any one of claims 1 to 5, wherein the step of determining the current state-of-charge of the battery to be detected according to the current, the current correction value and the initial state-of-charge specifically comprises:
determining a pre-estimated state of charge through a preset ampere-hour integral model according to the current;
and determining the current state of charge of the battery to be detected according to the estimated state of charge, the current correction value and the initial state of charge.
7. The battery state-of-charge detection method of any one of claims 1-5, wherein after the step of determining the current state-of-charge of the battery to be detected from the current, the current correction value, and the initial state-of-charge, the battery state-of-charge detection method further comprises:
determining the current residual capacity of the battery to be detected according to the current state of charge, and searching an early warning strategy corresponding to the current residual capacity;
and generating early warning information according to the early warning strategy, and sending the early warning information to a target client.
8. A battery state of charge detection apparatus, comprising: a memory, a processor and a battery state of charge detection program stored on the memory and executable on the processor, the battery state of charge detection program when executed by the processor implementing the steps of the battery state of charge detection method according to any one of claims 1 to 7.
9. A storage medium having stored thereon a battery state of charge detection program which, when executed by a processor, implements the steps of the battery state of charge detection method according to any one of claims 1 to 7.
10. A battery state of charge detection apparatus, comprising: the device comprises an acquisition module, a determination module and a detection module;
the acquisition module is used for acquiring the current, the current voltage, the current temperature and the initial state of charge of the battery to be detected;
the determining module is used for determining a current voltage difference value of the battery to be detected according to the current, the current voltage, the current temperature and the initial state of charge;
the determining module is further configured to determine a current correction value according to the initial state of charge and the current voltage difference value;
the detection module is used for determining the current state of charge of the battery to be detected according to the current, the current correction value and the initial state of charge.
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