CN114397587A - Method and device for estimating residual electric quantity of battery system and readable storage medium - Google Patents
Method and device for estimating residual electric quantity of battery system and readable storage medium Download PDFInfo
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- CN114397587A CN114397587A CN202210038402.5A CN202210038402A CN114397587A CN 114397587 A CN114397587 A CN 114397587A CN 202210038402 A CN202210038402 A CN 202210038402A CN 114397587 A CN114397587 A CN 114397587A
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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]
- G01R31/385—Arrangements for measuring battery or accumulator variables
- G01R31/387—Determining ampere-hour charge capacity or 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]
- G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. 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]
- G01R31/385—Arrangements for measuring battery or accumulator variables
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Abstract
The application relates to a method, a device and a readable storage medium for estimating the residual electric quantity of a battery system, relating to the technical field of the battery system and comprising the steps of obtaining the main path current sent by a first current sampling unit and calculating the initial main path electric quantity, obtaining the first branch current sent by a second current sampling unit and calculating the initial first branch electric quantity; determining initial second branch circuit electric quantity according to the initial main path electric quantity and the initial first branch circuit electric quantity, and calculating an electric quantity proportional coefficient between the main path and the second branch circuit according to the initial main path electric quantity and the initial second branch circuit electric quantity; acquiring actual second branch circuit electric quantity sent by a hardware integrator; and calibrating the initial main path electric quantity according to the actual second branch electric quantity and the electric quantity proportion coefficient to obtain the actual main path electric quantity, and calculating to obtain the residual electric quantity of the battery system according to the actual main path electric quantity and the initial electric quantity of the battery system. The method and the device can improve the estimation accuracy of the residual electric quantity of the battery system.
Description
Technical Field
The present disclosure relates to the field of battery systems, and more particularly, to a method and an apparatus for estimating remaining capacity of a battery system, and a readable storage medium.
Background
At present, the remaining capacity and energy of a battery system are generally estimated by methods such as an ampere-hour integral method, a table look-up method and a Kalman filtering method. However, in the charging and discharging process of the battery system (especially, the battery system of the lithium iron phosphate system), voltages are basically equal in a large electric quantity interval, so that a large calculation error is caused if a table look-up method or a kalman filter method is used for calculation, and when the battery system is full of electric quantity or empty of electric quantity, the battery voltage can be used for performing table look-up to correct the residual electric quantity or energy, and in an actual application scene, the battery system cannot be fully charged or discharged at many times, so that a voltage correction condition cannot be triggered.
Therefore, in most cases, the remaining capacity of the lithium iron phosphate battery system can only be estimated by using an ampere-hour integration method. However, the ampere-hour integration method is realized based on current sampling and preset calculation frequency, so that not only is an error of current sampling, but also an integration error is caused by discrete integration and sampling, and further the accuracy of an estimated residual electric quantity value is poor, and the estimated residual electric quantity value deviates from a true value; in addition, the long-term accumulated error may cause the estimated remaining capacity to deviate significantly from the true value. When the residual electric quantity value deviates from the true value, errors occur in data such as residual mileage, residual working time, charge and discharge limits and the like calculated based on the residual electric quantity value, so that a control system or application may be seriously adversely affected finally.
Disclosure of Invention
The application provides a method and a device for estimating the residual electric quantity of a battery system and a readable storage medium, which are used for solving the problem of poor accuracy of the estimation result of the residual electric quantity of the battery system in the related technology.
In a first aspect, a method for estimating remaining capacity of a battery system is provided, which includes the following steps:
acquiring main path current sent by a first current sampling unit and calculating to obtain initial main path electric quantity, and acquiring first branch current sent by a second current sampling unit and calculating to obtain initial first branch electric quantity;
determining initial second branch circuit electric quantity according to the initial main path electric quantity and the initial first branch circuit electric quantity, and calculating an electric quantity proportion coefficient between a main path and a second branch circuit according to the initial main path electric quantity and the initial second branch circuit electric quantity;
acquiring actual second branch circuit electric quantity sent by a hardware integrator, wherein the actual second branch circuit electric quantity is obtained by integrating current flowing through a second branch circuit by the hardware integrator;
calibrating the initial main path electric quantity according to the actual second branch electric quantity and the electric quantity proportion coefficient to obtain the actual main path electric quantity, and calculating to obtain the residual electric quantity of the battery system according to the actual main path electric quantity and the initial electric quantity of the battery system.
In some embodiments, the hardware integrator is a hardware integration circuit or an energy storage device for determining a capacity according to a voltage.
In some embodiments, before the step of obtaining the main path current sent from the first current sampling unit and calculating to obtain the initial main path electric quantity, the method further includes:
detecting whether a current exists on the first current sampling unit;
if the current exists, a loop between the second branch circuit and the first branch circuit is conducted, and the step of obtaining the main path current sent by the first current sampling unit and calculating to obtain the initial main path electric quantity is executed;
and if the current does not exist, disconnecting the loop between the second branch and the first branch.
In some embodiments, the first current sampling unit is a current divider or a current sensor; the second current sampling unit is a current divider or a current sensor.
In a second aspect, there is provided a battery system remaining capacity estimation apparatus including: the device comprises a processor, a first current sampling unit, a second current sampling unit and a hardware integrator; the processor is electrically connected with the first current sampling unit, the second current sampling unit and the hardware integrator respectively; the first current sampling unit and the second current sampling unit are connected in series and then are connected into a battery system;
the first current sampling unit is arranged on the main path and used for collecting the main path current of the main path;
the second current sampling unit is arranged on the first branch and used for collecting the first branch current of the first branch;
the hardware integrator is arranged on the second branch and used for integrating the current flowing through the second branch to obtain the actual electric quantity of the second branch;
the processor is configured to: acquiring main path current from the first current sampling unit and calculating to obtain initial main path electric quantity, and acquiring first branch path current from the second current sampling unit and calculating to obtain initial first branch path electric quantity; determining initial second branch circuit electric quantity according to the initial main path electric quantity and the initial first branch circuit electric quantity, and calculating an electric quantity proportion coefficient between a main path and a second branch circuit according to the initial main path electric quantity and the initial second branch circuit electric quantity; and acquiring actual second branch circuit electric quantity from the hardware integrator, calibrating the initial main path electric quantity according to the actual second branch circuit electric quantity and the electric quantity proportional coefficient to obtain actual main path electric quantity, and calculating to obtain the residual electric quantity of the battery system according to the actual main path electric quantity and the initial electric quantity of the battery system.
In some embodiments, the hardware integrator is a hardware integration circuit or an energy storage device for determining a capacity according to a voltage.
In some embodiments, the processor is further configured to:
detecting whether a current exists on the first current sampling unit;
if yes, a loop between the second branch circuit and the first branch circuit is conducted, and the step of obtaining the main path current from the first current sampling unit and calculating to obtain the initial main path electric quantity is executed;
and if the current does not exist, disconnecting the loop between the second branch and the first branch.
In some embodiments, the first current sampling unit is connected in a positive manner, and the second current sampling unit is connected in a negative manner.
In some embodiments, the first current sampling unit is a current divider or a current sensor; the second current sampling unit is a current divider or a current sensor.
In a third aspect, a computer-readable storage medium is provided, which stores a computer program that, when executed by a processor, implements the aforementioned battery system remaining capacity estimation method.
The beneficial effect that technical scheme that this application provided brought includes: the accuracy of estimating the residual capacity of the battery system can be effectively improved.
The application provides a method, a device and a readable storage medium for estimating the residual electric quantity of a battery system, which comprises the steps of obtaining the main path current sent by a first current sampling unit and calculating to obtain the initial main path electric quantity, obtaining the first branch current sent by a second current sampling unit and calculating to obtain the initial first branch electric quantity; determining initial second branch circuit electric quantity according to the initial main path electric quantity and the initial first branch circuit electric quantity, and calculating an electric quantity proportional coefficient between the main path and the second branch circuit according to the initial main path electric quantity and the initial second branch circuit electric quantity; acquiring actual second branch circuit electric quantity sent by a hardware integrator, wherein the actual second branch circuit electric quantity is obtained by integrating current flowing through a second branch circuit by the hardware integrator; and calibrating the initial main path electric quantity according to the actual second branch electric quantity and the electric quantity proportion coefficient to obtain the actual main path electric quantity, and calculating to obtain the residual electric quantity of the battery system according to the actual main path electric quantity and the initial electric quantity of the battery system. Through the method and the device, real-time current collection and electric quantity calculation can be carried out on the main path and the first branch path, real-time integration is carried out on the current on the second branch path based on the hardware integrator, real-time electric quantity on the second branch path is obtained, then the real-time electric quantity on the second branch path calibrates the initial main path electric quantity on the main path, the actual electric quantity consumed on the main path is obtained, namely the actual electric quantity consumed by the battery, the battery residual electric quantity is calculated accordingly, ADC conversion and periodic sampling are not needed, and errors generated by the ADC conversion and accumulated errors caused by the periodic sampling are avoided, so that the accuracy of residual electric quantity estimation of the battery system is effectively improved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic flowchart illustrating a method for estimating remaining power of a battery system according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of a remaining power estimation device of a battery system according to an embodiment of the present disclosure;
fig. 3 is a circuit schematic diagram of a hardware integrator according to an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The embodiment of the application provides a method and a device for estimating the residual electric quantity of a battery system and a readable storage medium, which can solve the problem of poor accuracy of the estimation result of the residual electric quantity of the battery system in the related technology.
Fig. 1 is a method for estimating remaining capacity of a battery system according to an embodiment of the present disclosure, including the following steps:
step S10: acquiring main path current sent by a first current sampling unit and calculating to obtain initial main path electric quantity, and acquiring first branch current sent by a second current sampling unit and calculating to obtain initial first branch electric quantity;
exemplarily, referring to fig. 2, in the present embodiment, the first current sampling unit and the second current sampling unit are connected in series to a first pole (i.e., a positive pole) of the battery system, and may also be connected to a negative pole of the battery system, specifically to which pole of the battery system is connected, which is determined according to actual requirements and is not limited herein; then, the current on the main path is acquired through the first current sampling unit, the processor acquires the current on the main path from the first current sampling unit, and the initial main path electric quantity C1 on the main path is calculated based on an ampere-hour integral or Ford-ampere-hour integral method; the current on the main path flows to the first branch circuit and the second branch circuit respectively after passing through the first current sampling unit, the current on the first branch circuit is collected through the second current sampling unit, and the processor obtains the current on the first branch circuit from the second current sampling unit and calculates to obtain the initial first branch circuit electric quantity C3 on the first branch circuit. It should be noted that, although only two branches (i.e., the first branch and the second branch) are shown in fig. 2, the circuit may be adjusted according to actual requirements, that is, the branch of the main path includes not only the first branch and the second branch, but also a third branch and a fourth branch, etc., and the corresponding branches such as the third branch and the fourth branch are correspondingly provided with current sampling units to collect currents on the corresponding branches.
Further, in this embodiment of the application, the first current sampling unit is a shunt or a current sensor, and the current sensor may be a hall sensor or a fluxgate sensor; the second current sampling unit is a current divider or a current sensor, and the current sensor can be a Hall sensor or a fluxgate sensor.
Exemplarily, the types of the first current sampling unit and the second current sampling unit in this embodiment may be selected according to actual requirements, for example, to reduce the cost, the current sampling unit may be set as a current divider, but at this time, a processor is required to complete the isolation operation of high voltage and low voltage, and the overall circuit is more complex; however, if the whole circuit is a simple point, the current sampling unit can be a current sensor, and the current sensor has a high-low voltage isolation function, but the cost is higher. In addition, the types of the current sampling units may be combined according to actual requirements, for example, the first combination: the first current sampling unit is a current divider, and the second current sampling unit is also a current divider; a second combination of: the first current sampling unit is a current sensor, and the second current sampling unit is a current divider; in a third combination: the first current sampling unit is a current divider, and the second current sampling unit is a current sensor; a fourth combination: the first current sampling unit is a current sensor, and the second current sampling unit is also a current sensor.
The first current sampling Unit and the second current sampling Unit may also use different processors (even some ADCs with integration function (Analog digital converters are also possible)), for example, the processors are determined according to the arrangement positions of the first current sampling Unit and the second current sampling Unit, for example, when the first current sampling Unit and the second current sampling Unit are far from the processor so that a high-voltage wire cannot be connected to the processor, the first current sampling Unit may be enabled to sample through an Analog front-end chip, and the second current sampling Unit is enabled to sample through a main MCU (Microcontroller Unit).
In addition, the first current sampling unit and the second current sampling unit can also adopt devices of different materials, different measuring ranges and different manufacturers so as to prevent common cause failure; the first current sampling unit and the second current sampling unit can be connected in opposite directions when connected, for example, the first current sampling unit is connected in a positive mode, the second current sampling unit is connected in a reverse mode, and one of the first current sampling unit and the second current sampling unit is reversed and reversed during calculation, so that the influence of temperature drift on the resistance value of the current sampling unit is eliminated, and the precision is improved.
The current unit with different types, materials and the like and the current unit with different connection modes can meet the requirement on current sampling on the basis of safely realizing the function, and the product cost is effectively reduced.
Step S20: determining initial second branch circuit electric quantity according to the initial main path electric quantity and the initial first branch circuit electric quantity, and calculating an electric quantity proportion coefficient between a main path and a second branch circuit according to the initial main path electric quantity and the initial second branch circuit electric quantity;
exemplarily, in the embodiment of the present application, the initial second branch power amount C2 on the second branch is calculated according to the initial main path power amount C1 and the initial first branch power amount C3 integrated by the processor, that is, C2 ═ C1-C3; and then, determining an electric quantity proportion coefficient k between the main path and the second branch circuit according to the initial main path electric quantity C1 and the initial second branch circuit electric quantity C2, wherein k is C1/C2, so that the initial main path electric quantity is corrected through the electric quantity proportion coefficient to obtain the actual electric quantity on the main path.
Step S30: acquiring actual second branch circuit electric quantity sent by a hardware integrator, wherein the actual second branch circuit electric quantity is obtained by integrating current flowing through a second branch circuit by the hardware integrator;
exemplarily, in the embodiment of the present application, since the hardware integrator is present on the second branch, the actual second branch power C2 'can be directly integrated by the hardware integrator, so as to correct the initial main path power by the actual second branch power C2'.
Further, in the embodiment of the present application, the hardware integrator is a hardware integration circuit or an energy storage device for determining a capacity according to a voltage.
Exemplarily, the hardware integrator in the embodiment may be a hardware integration circuit, or may be a simple energy storage device mainly composed of a capacitor, a super capacitor, a battery, and the like and capable of directly determining a capacity through a voltage, and specifically may be determined according to an actual requirement, and is not limited herein; when the hardware integrator is an energy storage device mainly composed of a capacitor, a super capacitor, a battery and the like, the circuit complexity of the hardware integrator can be effectively reduced, the hardware integrator can also be used as a standby energy storage unit to supply power to the processor, and the phenomenon that the processor is suddenly powered off to cause data loss or damage equipment, even casualties is caused is prevented, so that the safe operation of the system is ensured. Of course, when the hardware integrator is an energy storage device mainly composed of a capacitor, a super capacitor, a battery, and the like, the integration loop needs to be protected by the processor to prevent the device from being overcharged or overdischarged.
Further, in this embodiment of the application, before the step of obtaining the main path current sent from the first current sampling unit and calculating to obtain the initial main path electric quantity, the method further includes the following steps:
detecting whether a current exists on the first current sampling unit;
if the current exists, a loop between the second branch circuit and the first branch circuit is conducted, and the step of obtaining the main path current sent by the first current sampling unit and calculating to obtain the initial main path electric quantity is executed;
and if the current does not exist, disconnecting the loop between the second branch and the first branch.
Exemplarily, when the hardware integrator is an energy storage device mainly composed of a capacitor, a super capacitor, a battery, or the like, it is necessary to control a hardware integration loop through a current on the first current sampling unit, that is, when there is no current on the first current sampling unit, a loop between the second branch and the first branch is disconnected, and when there is a current on the first current sampling unit, a loop between the first branch and the second branch is connected.
Step S40: calibrating the initial main path electric quantity according to the actual second branch electric quantity and the electric quantity proportion coefficient to obtain the actual main path electric quantity, and calculating to obtain the residual electric quantity of the battery system according to the actual main path electric quantity and the initial electric quantity of the battery system.
Exemplarily, in the embodiment of the present application, the initial main path electric quantity C1 is calibrated by the actual second branch electric quantity C2 ' and the electric quantity proportionality coefficient k, so as to obtain the actual main path electric quantity C1 ' passing through the main path, that is, C1 ', k × C2 ', C1/C2 × C2 ', and C1 ' is the electric quantity consumed or obtained by the battery system, so that the battery remaining electric quantity can be accurately calculated according to the actual main path electric quantity C1 ' and the initial electric quantity of the battery system.
Therefore, the main path and the first branch can be subjected to real-time current collection and electric quantity calculation through the method, the current on the second branch is subjected to real-time integration based on the hardware integrator to obtain the real-time electric quantity on the second branch, the initial main path electric quantity on the main path is calibrated through the real-time electric quantity on the second branch to obtain the actual electric quantity actually consumed on the main path, namely the actual electric quantity consumed by the battery, the battery residual electric quantity is calculated accordingly, ADC conversion and periodic sampling are not needed, further, errors generated by the ADC conversion and accumulated errors caused by the periodic sampling are avoided, and higher integration precision is obtained, so that the accuracy of estimating the residual electric quantity of the battery system is effectively improved.
Referring to fig. 2, an embodiment of the present application further provides a device for estimating remaining capacity of a battery system, including: the device comprises a processor, a first current sampling unit, a second current sampling unit and a hardware integrator; the processor is electrically connected with the first current sampling unit, the second current sampling unit and the hardware integrator respectively; the first current sampling unit and the second current sampling unit are connected in series and then are connected into a battery system;
the first current sampling unit is arranged on the main path and used for collecting the main path current of the main path;
the second current sampling unit is arranged on the first branch and used for collecting the first branch current of the first branch;
the hardware integrator is arranged on the second branch and used for integrating the current flowing through the second branch to obtain the actual electric quantity of the second branch;
the processor is configured to: acquiring main path current from the first current sampling unit and calculating to obtain initial main path electric quantity, and acquiring first branch path current from the second current sampling unit and calculating to obtain initial first branch path electric quantity; determining initial second branch circuit electric quantity according to the initial main path electric quantity and the initial first branch circuit electric quantity, and calculating an electric quantity proportion coefficient between a main path and a second branch circuit according to the initial main path electric quantity and the initial second branch circuit electric quantity; and acquiring actual second branch circuit electric quantity from the hardware integrator, calibrating the initial main path electric quantity according to the actual second branch circuit electric quantity and the electric quantity proportional coefficient to obtain actual main path electric quantity, and calculating to obtain the residual electric quantity of the battery system according to the actual main path electric quantity and the initial electric quantity of the battery system.
Exemplarily, in the present embodiment, the first current sampling unit and the second current sampling unit are connected in series to a first pole (i.e., a positive pole) of the battery system, and a negative pole of the battery system forms a closed loop with the first branch and the second branch through an L/C (i.e., a load or a charger, etc.); then, the current on the main path is acquired through the first current sampling unit, the processor acquires the current on the main path from the first current sampling unit, and the initial main path electric quantity C1 on the main path is calculated based on an ampere-hour integral or Ford-ampere-hour integral method; the current on the main path flows to the first branch circuit and the second branch circuit respectively after passing through the first current sampling unit, the current on the first branch circuit is collected through the second current sampling unit, and the processor obtains the current on the first branch circuit from the first current sampling unit and calculates to obtain the initial first branch circuit electric quantity C3 on the first branch circuit. It should be noted that, although only two branches (i.e., the first branch and the second branch) are shown in fig. 2, the circuit may be adjusted according to actual requirements, that is, the branch of the main path includes not only the first branch and the second branch, but also a third branch and a fourth branch, etc., and the corresponding branches such as the third branch and the fourth branch are correspondingly provided with current sampling units to collect currents on the corresponding branches.
The processor calculates an initial second branch circuit electric quantity C2 on the second branch circuit according to the integrated initial main path electric quantity C1 and initial first branch circuit electric quantity C3, namely C2-C1-C3; then, determining an electric quantity proportion coefficient k between the main path and the second branch circuit according to the initial main path electric quantity C1 and the initial second branch circuit electric quantity C2, wherein k is C1/C2; because the second branch is provided with the hardware integrator, the actual electric quantity passing through the second branch, namely the actual second branch electric quantity C2', can be directly integrated through the hardware integrator; then, the initial main path electric quantity C1 is calibrated through the actual second branch electric quantity C2 ' and the electric quantity proportion coefficient k, so as to obtain the actual main path electric quantity C1 ' passing through the main path, that is, C1 ', k × C2 ', C1/C2 × C2 ', and C1 ' is the electric quantity consumed or obtained by the battery system, and further, the battery residual electric quantity can be accurately calculated according to the actual main path electric quantity C1 ' and the initial electric quantity of the battery system.
Therefore, the real-time current collection can be carried out on the main path and the first branch path through the first current sampling unit and the second current sampling unit in the method, the electric quantity calculation can be carried out through the processor, the current on the second branch path is integrated in real time based on the hardware integrator, the real-time electric quantity on the second branch path is obtained, the processor calibrates the initial main path electric quantity on the main path through the real-time electric quantity on the second branch path, the actual consumed electric quantity on the main path, namely the actual consumed electric quantity of the battery is obtained, the battery residual electric quantity is calculated accordingly, ADC conversion and periodic sampling are not needed, errors generated by ADC conversion and accumulated errors caused by periodic sampling are avoided, higher integral precision is obtained, and the estimation accuracy of the residual electric quantity of the battery system is effectively improved.
Further, in the embodiment of the present application, the hardware integrator is a hardware integration circuit or an energy storage device for determining a capacity according to a voltage.
Exemplarily, the hardware integrator in the embodiment may be a hardware integration circuit, or may be a simple energy storage device mainly composed of a capacitor, a super capacitor, a battery, and the like and capable of directly determining a capacity through a voltage, and may be specifically determined according to an actual requirement, which is not limited herein.
When the hardware integrator is an energy storage device mainly composed of a capacitor, a super capacitor, a battery and the like, the circuit composition of the hardware integrator is shown in fig. 3, wherein a ternary battery is preferably used as a core device of the hardware integrator, I in fig. 3 is an isolation circuit of the hardware integrator, G is an amplification circuit, S1 and S2 are MOS transistors, a and B are current input and output (according to different charging and discharging, a can be used as output, B can be used as input), E is a battery, and M is an interface of the hardware integrator and a processor; the interface can be a communication interface, the processor controls the S2 to be opened or closed through communication, and the M directly collects the voltage of the E and transmits the voltage to the processor through communication; the interface can also be an analog quantity interface, and the processor directly collects the voltage of the E through an analog quantity and controls the opening and the closing of the S2.
Therefore, when the battery system is discharged, current flows into the battery E from the battery A and then flows out from the battery B, and the battery E is charged (the battery E can be reversely connected, and the battery E is also discharged when the battery system is discharged); when the battery system is charged, current flows from B to E and from a, at which time the battery E is discharged (E may be reversed, and E is charged when the battery system is charged). Therefore, the capacity of the battery E can be determined by collecting the voltage of the battery E, and then the capacity is used for calculating the capacity passing through the hardware integrator.
Further, in this embodiment of the present application, the processor is further configured to:
detecting whether a current exists on the first current sampling unit;
if yes, a loop between the second branch circuit and the first branch circuit is conducted, and the step of obtaining the main path current from the first current sampling unit and calculating to obtain the initial main path electric quantity is executed;
and if the current does not exist, disconnecting the loop between the second branch and the first branch.
The first current sampling unit is connected in a positive mode, and the second current sampling unit is connected in a reverse mode.
Further, in this embodiment of the application, the connection mode of the first current sampling unit is positive connection, and the connection mode of the second current sampling unit is reverse connection.
Exemplarily, the first current sampling unit and the second current sampling unit in this embodiment may be connected in opposite directions when connected, for example, the connection mode of the first current sampling unit is positive connection, the connection mode of the second current sampling unit is reverse connection, and one of the first current sampling unit and the second current sampling unit is reversed and reversed during calculation, so as to eliminate the influence of temperature drift on the resistance value of the current sampling unit, and further improve the accuracy.
Further, in the embodiment of the present application, the first current sampling unit is a current divider or a current sensor; the second current sampling unit is a current divider or a current sensor.
It should be noted that, as will be clear to those skilled in the art, for convenience and brevity of description, the specific working processes of the above-described apparatus and units may refer to the corresponding processes in the foregoing embodiment of the method for estimating remaining power of a battery system, and are not described herein again.
The embodiment of the present application further provides a computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, all or part of the steps of the aforementioned method for estimating the remaining capacity of the battery system are implemented.
The embodiments of the present application may implement all or part of the foregoing processes, or may be implemented by a computer program to instruct related hardware, where the computer program may be stored in a computer-readable storage medium, and when the computer program is executed by a processor, the computer program may implement the steps of the foregoing methods. Wherein the computer program comprises computer program code, which may be in the form of source code, object code, an executable file or some intermediate form, etc. The computer readable medium may include: any entity or device capable of carrying computer program code, recording medium, U-disk, removable hard disk, magnetic disk, optical disk, computer memory, Read-Only memory (ROM), Random Access Memory (RAM), electrical carrier wave signals, telecommunications signals, software distribution media, and the like. It should be noted that the computer readable medium may contain other components which may be suitably increased or decreased as required by legislation and patent practice in jurisdictions, for example, in some jurisdictions, in accordance with legislation and patent practice, the computer readable medium does not include electrical carrier signals and telecommunications signals.
As will be appreciated by one skilled in the art, embodiments of the present invention may be provided as a method, system, server, or computer program product. Accordingly, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present invention may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, optical storage, and the like) having computer-usable program code embodied therein.
The present invention is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
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 description is merely exemplary of the present application and is presented to enable those skilled in the art to understand and practice the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A method for estimating a remaining capacity of a battery system, comprising:
acquiring main path current sent by a first current sampling unit and calculating to obtain initial main path electric quantity, and acquiring first branch current sent by a second current sampling unit and calculating to obtain initial first branch electric quantity;
determining initial second branch circuit electric quantity according to the initial main path electric quantity and the initial first branch circuit electric quantity, and calculating an electric quantity proportion coefficient between a main path and a second branch circuit according to the initial main path electric quantity and the initial second branch circuit electric quantity;
acquiring actual second branch circuit electric quantity sent by a hardware integrator, wherein the actual second branch circuit electric quantity is obtained by integrating current flowing through a second branch circuit by the hardware integrator;
calibrating the initial main path electric quantity according to the actual second branch electric quantity and the electric quantity proportion coefficient to obtain the actual main path electric quantity, and calculating to obtain the residual electric quantity of the battery system according to the actual main path electric quantity and the initial electric quantity of the battery system.
2. The battery system remaining capacity estimation method according to claim 1, characterized in that: the hardware integrator is a hardware integrating circuit or an energy storage device used for determining the capacity according to the voltage.
3. The method for estimating remaining capacity of a battery system according to claim 2, wherein before the step of obtaining the main path current transmitted from the first current sampling unit and calculating the initial main path capacity, further comprising:
detecting whether a current exists on the first current sampling unit;
if the current exists, a loop between the second branch circuit and the first branch circuit is conducted, and the step of obtaining the main path current sent by the first current sampling unit and calculating to obtain the initial main path electric quantity is executed;
and if the current does not exist, disconnecting the loop between the second branch and the first branch.
4. The battery system remaining capacity estimation method according to claim 1, characterized in that: the first current sampling unit is a current divider or a current sensor; the second current sampling unit is a current divider or a current sensor.
5. A battery system remaining capacity estimation device, comprising: the device comprises a processor, a first current sampling unit, a second current sampling unit and a hardware integrator; the processor is electrically connected with the first current sampling unit, the second current sampling unit and the hardware integrator respectively; the first current sampling unit and the second current sampling unit are connected in series and then are connected into a battery system;
the first current sampling unit is arranged on the main path and used for collecting the main path current of the main path;
the second current sampling unit is arranged on the first branch and used for collecting the first branch current of the first branch;
the hardware integrator is arranged on the second branch and used for integrating the current flowing through the second branch to obtain the actual electric quantity of the second branch;
the processor is configured to: acquiring main path current from the first current sampling unit and calculating to obtain initial main path electric quantity, and acquiring first branch path current from the second current sampling unit and calculating to obtain initial first branch path electric quantity; determining initial second branch circuit electric quantity according to the initial main path electric quantity and the initial first branch circuit electric quantity, and calculating an electric quantity proportion coefficient between a main path and a second branch circuit according to the initial main path electric quantity and the initial second branch circuit electric quantity; and acquiring actual second branch circuit electric quantity from the hardware integrator, calibrating the initial main path electric quantity according to the actual second branch circuit electric quantity and the electric quantity proportional coefficient to obtain actual main path electric quantity, and calculating to obtain the residual electric quantity of the battery system according to the actual main path electric quantity and the initial electric quantity of the battery system.
6. The battery system remaining capacity estimation device according to claim 5, wherein: the hardware integrator is a hardware integrating circuit or an energy storage device used for determining the capacity according to the voltage.
7. The battery system remaining capacity estimation device of claim 6, wherein the processor is further configured to:
detecting whether a current exists on the first current sampling unit;
if yes, a loop between the second branch circuit and the first branch circuit is conducted, and the step of obtaining the main path current from the first current sampling unit and calculating to obtain the initial main path electric quantity is executed;
and if the current does not exist, disconnecting the loop between the second branch and the first branch.
8. The battery system remaining capacity estimation device according to claim 5, wherein: the first current sampling unit is connected in a positive mode, and the second current sampling unit is connected in a reverse mode.
9. The battery system remaining capacity estimation device according to claim 5, wherein: the first current sampling unit is a current divider or a current sensor; the second current sampling unit is a current divider or a current sensor.
10. A computer-readable storage medium characterized by: the computer storage medium stores a computer program that, when executed by a processor, implements the battery system remaining capacity estimation method of any one of claims 1 to 4.
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| CN202210038402.5A CN114397587A (en) | 2022-01-13 | 2022-01-13 | Method and device for estimating residual electric quantity of battery system and readable storage medium |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115112948A (en) * | 2022-07-29 | 2022-09-27 | 苏州维众数据技术有限公司 | Multi-branch electric quantity calibration method and device, intelligent terminal and storage medium |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115112948A (en) * | 2022-07-29 | 2022-09-27 | 苏州维众数据技术有限公司 | Multi-branch electric quantity calibration method and device, intelligent terminal and storage medium |
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