Method, device and readable storage medium for estimating remaining power of battery system

Abstract

The present application relates to a method, device, and readable storage medium for estimating the remaining power of a battery system, and relates to the technical field of battery systems. The method includes obtaining a main path current sent from a first current sampling unit and calculating an initial main path power, obtaining a first branch current sent from a second current sampling unit and calculating an initial first branch power; determining an initial second branch power based on the initial main path power and the initial first branch power, and calculating a power proportional coefficient between the main path and the second branch based on the initial main path power and the initial second branch power; obtaining an actual second branch power sent by a hardware integrator; calibrating the initial main path power based on the actual second branch power and the power proportional coefficient to obtain the actual main path power, and calculating the remaining power of the battery system based on the actual main path power and the initial power of the battery system. The present application can improve the accuracy of estimating the remaining power of the battery system.

Description

Technical Field

[0001] The present application relates to the technical field of battery systems, and in particular to a method, device, and readable storage medium for estimating the remaining power of a battery system. Background Art

[0002] Currently, the remaining charge and energy of battery systems are generally estimated using methods such as the ampere-hour integration method, table lookup method, and Kalman filtering method. However, because the voltage of a battery system (especially a lithium iron phosphate battery system) is essentially equal over a large range of charge during the charging and discharging process, using table lookup or Kalman filtering methods will result in large calculation errors. Furthermore, the remaining charge or energy can only be corrected by using the battery voltage table lookup when the battery is fully charged or empty. In actual application scenarios, the battery system is often neither fully charged nor discharged, making it impossible to trigger the voltage correction condition.

[0003] Therefore, in most cases, the remaining capacity of lithium iron phosphate battery systems can only be estimated using the ampere-hour integration method. However, because the ampere-hour integration method is based on current sampling and a preset calculation frequency, it not only suffers from current sampling errors, but also from integration errors caused by discrete integration and sampling. This leads to poor accuracy in the estimated remaining capacity value, which deviates from the actual value. Furthermore, long-term accumulated errors can cause the estimated remaining capacity to deviate significantly from the actual value. When the remaining capacity value deviates from the actual value, data such as the remaining mileage, remaining operating time, and charge and discharge limits calculated based on the remaining capacity value will also be inaccurate, which can ultimately have a very serious adverse impact on the control system or application. Summary of the Invention

[0004] The present application provides a method, device and readable storage medium for estimating the remaining power of a battery system to solve the problem of poor accuracy of the remaining power estimation result of the battery system in the related art.

[0005] In a first aspect, a method for estimating the remaining power of a battery system is provided, comprising the following steps:

[0006] Obtaining the main path current sent from the first current sampling unit and calculating the initial main path power, obtaining the first branch current sent from the second current sampling unit and calculating the initial first branch power;

[0007] Determining an initial second branch power according to the initial main path power and the initial first branch power, and calculating a power ratio coefficient between the main path and the second branch according to the initial main path power and the initial second branch power;

[0008] Acquire an actual second branch electrical quantity sent by the hardware integrator, where the actual second branch electrical quantity is obtained by integrating the current flowing through the second branch by the hardware integrator;

[0009] The initial main path power is calibrated according to the actual second branch power and the power proportional coefficient to obtain the actual main path power, and the remaining power of the battery system is calculated according to the actual main path power and the initial power of the battery system.

[0010] In some embodiments, the hardware integrator is a hardware integration circuit or an energy storage device for determining capacity according to voltage.

[0011] In some embodiments, before the step of obtaining the main path current sent from the first current sampling unit and calculating the initial main path power, the method further includes:

[0012] detecting whether there is current on the first current sampling unit;

[0013] If so, the circuit between the second branch and the first branch is connected, and the steps of obtaining the main path current sent from the first current sampling unit and calculating the initial main path power are performed;

[0014] If not, the loop between the second branch and the first branch is disconnected.

[0015] In some embodiments, the first current sampling unit is a shunt or a current sensor; the second current sampling unit is a shunt or a current sensor.

[0016] In a second aspect, a battery system remaining capacity estimation device is provided, comprising: a processor, a first current sampling unit, a second current sampling unit, and a hardware integrator; the processor is electrically connected to 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 connected to the battery system;

[0017] Wherein, the first current sampling unit is provided on the main path and is used to collect the main path current of the main path;

[0018] The second current sampling unit is provided on the first branch and is used to collect the first branch current of the first branch;

[0019] The hardware integrator is provided on the second branch and is used to integrate the current flowing through the second branch to obtain the actual second branch electric quantity;

[0020] The processor is configured to: obtain a main path current from the first current sampling unit and calculate an initial main path charge, obtain a first branch current from the second current sampling unit and calculate an initial first branch charge; determine an initial second branch charge based on the initial main path charge and the initial first branch charge, and calculate a charge proportional coefficient between the main path and the second branch based on the initial main path charge and the initial second branch charge; obtain an actual second branch charge from the hardware integrator, calibrate the initial main path charge based on the actual second branch charge and the charge proportional coefficient to obtain an actual main path charge, and calculate a remaining charge of the battery system based on the actual main path charge and the initial charge of the battery system.

[0021] In some embodiments, the hardware integrator is a hardware integration circuit or an energy storage device for determining capacity according to voltage.

[0022] In some embodiments, the processor is further configured to:

[0023] detecting whether there is current on the first current sampling unit;

[0024] If so, the circuit between the second branch and the first branch is connected, and the steps of obtaining the main path current from the first current sampling unit and calculating the initial main path power are performed;

[0025] If not, the loop between the second branch and the first branch is disconnected.

[0026] In some embodiments, the first current sampling unit is connected in a forward connection manner, and the second current sampling unit is connected in a reverse connection manner.

[0027] In some embodiments, the first current sampling unit is a shunt or a current sensor; the second current sampling unit is a shunt or a current sensor.

[0028] In a third aspect, a computer-readable storage medium is provided, wherein the computer storage medium stores a computer program, and when the computer program is executed by a processor, the aforementioned method for estimating the remaining power of a battery system is implemented.

[0029] The beneficial effects of the technical solution provided by this application include: effectively improving the accuracy of the remaining power estimation of the battery system.

[0030] The present application provides a method, device and readable storage medium for estimating the remaining power of a battery system, including obtaining a main path current sent from a first current sampling unit and calculating an initial main path power, obtaining a first branch current sent from a second current sampling unit and calculating an initial first branch power; determining an initial second branch power based on the initial main path power and the initial first branch power, and calculating a power proportional coefficient between the main path and the second branch based on the initial main path power and the initial second branch power; obtaining an actual second branch power sent by a hardware integrator, where the actual second branch power is obtained by integrating the current flowing through the second branch by the hardware integrator; calibrating the initial main path power based on the actual second branch power and the power proportional coefficient to obtain the actual main path power, and calculating the remaining power of the battery system based on the actual main path power and the initial power of the battery system. Through the present application, real-time current acquisition and power calculation can be performed on the main path and the first branch, and the current on the second branch can be integrated in real time based on the hardware integrator to obtain the real-time power on the second branch. The initial main path power on the main path is then calibrated with the real-time power on the second branch to obtain the real power actually consumed on the main path, that is, the real power consumed by the battery, and the remaining battery power is calculated based on this. There is no need for ADC conversion and periodic sampling, thereby avoiding the error caused by ADC conversion and the cumulative error caused by periodic sampling, thereby effectively improving the accuracy of the remaining power estimation of the battery system. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0032] Figure 1 A flowchart of a method for estimating the remaining power of a battery system provided in an embodiment of the present application;

[0033] Figure 2 A schematic diagram of the structure of a battery system remaining power estimation device provided in an embodiment of the present application;

[0034] Figure 3 A circuit diagram of a hardware integrator provided in an embodiment of the present application. DETAILED DESCRIPTION

[0035] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0036] The embodiments of the present application provide a method, device, and readable storage medium for estimating the remaining power of a battery system, which can solve the problem of poor accuracy of the remaining power estimation results of the battery system in the related art.

[0037] Figure 1 A method for estimating the remaining power of a battery system provided in an embodiment of the present application includes the following steps:

[0038] Step S10: obtaining the main path current sent from the first current sampling unit and calculating the initial main path power, obtaining the first branch current sent from the second current sampling unit and calculating the initial first branch power;

[0039] For example, see Figure 2 As shown, in this embodiment, the first current sampling unit and the second current sampling unit are connected in series to the first pole (i.e., the positive pole) of the battery system. Of course, they can also be connected to the negative pole of the battery system. The specific connection to which pole of the battery system is determined according to actual needs and is not limited here; then the current on the main path is collected by the first current sampling unit, and the processor obtains the current on the main path from the first current sampling unit and calculates the initial main path power C1 on the main path based on the ampere-hour integration or Ford ampere-hour integration method; after the current on the main path passes through the first current sampling unit, it flows to the first branch and the second branch respectively. The current on the first branch is collected by the second current sampling unit, and the processor obtains the current on the first branch from the second current sampling unit and calculates the initial first branch power C3 on the first branch. It should be noted that Figure 2 Although only two branches (i.e., the first branch and the second branch) are shown, the circuit can be adjusted according to actual needs, that is, the branches of the main path include not only the first branch and the second branch, but also the third branch and the fourth branch, etc., and current sampling units are correspondingly set on the corresponding third branch and the fourth branch to collect the current on the corresponding branch.

[0040] Furthermore, in an embodiment of the present application, the first current sampling unit is a shunt or a current sensor, which may be a Hall sensor or a fluxgate sensor; the second current sampling unit is a shunt or a current sensor, which may be a Hall sensor or a fluxgate sensor.

[0041] For example, the types of the first current sampling unit and the second current sampling unit in this embodiment can be selected based on actual needs. For example, to reduce costs, the current sampling unit can be set as a shunt. However, in this case, a processor is required to complete the high and low voltage isolation, making the overall circuit more complex. To simplify the overall circuit, the current sampling unit can be set as a current sensor. The current sensor itself has the function of high and low voltage isolation, but the cost will be higher. In addition, the types of current sampling units can be combined according to actual needs. For example, in the first combination, the first current sampling unit is a shunt, and the second current sampling unit is also a shunt; in the second combination, the first current sampling unit is a current sensor, and the second current sampling unit is a shunt; in the third combination, the first current sampling unit is a shunt, and the second current sampling unit is a current sensor; in the fourth combination, the first current sampling unit is a current sensor, and the second current sampling unit is also a current sensor.

[0042] The first current sampling unit and the second current sampling unit may also use different processors (even some ADCs (Analog Digital Converters) with integration functions) to perform current integration. For example, the processors may be determined based on the locations of the first and second current sampling units. For example, when the first and second current sampling units are far away from the processor so that the high-voltage line cannot be connected to the processor, the first current sampling unit may perform sampling via an analog front-end chip, while the second current sampling unit may perform sampling via a main MCU (Microcontroller Unit).

[0043] In addition, the first current sampling unit and the second current sampling unit can also use devices of different materials, different ranges, and different manufacturers to prevent common cause failures; the first current sampling unit and the second current sampling unit can also be connected in opposite directions. For example, the first current sampling unit is connected in a forward connection and the second current sampling unit is connected in a reverse connection. During calculation, one of them is reversed to eliminate the influence of temperature drift on the resistance value of the current sampling unit, thereby improving accuracy.

[0044] By selecting the above-mentioned current units of different types and materials, as well as current units with different connection methods, the requirements for current sampling can be met on the basis of safely realizing the functions, thereby effectively reducing product costs.

[0045] Step S20: determining an initial second branch power according to the initial main path power and the initial first branch power, and calculating a power ratio coefficient between the main path and the second branch according to the initial main path power and the initial second branch power;

[0046] Exemplarily, in an embodiment of the present application, the initial second branch power C2 on the second branch is calculated based on the initial main path power C1 and the initial first branch power C3 obtained by processor integration, that is, C2 = C1-C3; and then the power proportional coefficient k between the main path and the second branch is determined based on the initial main path power C1 and the initial second branch power C2, that is, k = C1 / C2, so that the initial main path power is corrected by the power proportional coefficient to obtain the actual power on the main path.

[0047] Step S30: Acquire the actual second branch power sent by the hardware integrator, where the actual second branch power is obtained by integrating the current flowing through the second branch by the hardware integrator;

[0048] Exemplarily, in an embodiment of the present application, since there is a hardware integrator on the second branch, the real electric quantity passing through the second branch, that is, the actual second branch electric quantity C2', can be directly integrated by the hardware integrator, so that the initial main path electric quantity can be corrected by the actual second branch electric quantity C2'.

[0049] Furthermore, in an embodiment of the present application, the hardware integrator is a hardware integration circuit or an energy storage device for determining capacity according to voltage.

[0050] For example, the hardware integrator in this embodiment can be a hardware integration circuit, or it can be a simple energy storage device mainly composed of capacitors, supercapacitors, batteries, etc., which can directly determine the capacity through voltage. The specific configuration can be determined according to actual needs and is not limited here. When the hardware integrator is an energy storage device mainly composed of capacitors, supercapacitors, batteries, etc., it can not only effectively reduce the circuit complexity of the hardware integrator, but also serve as a backup energy storage unit to power the processor, preventing the processor from suddenly losing power and causing data loss or damage to the equipment, or even causing casualties, to ensure the safe operation of the system. Of course, when the hardware integrator is an energy storage device mainly composed of capacitors, supercapacitors, batteries, etc., it is necessary to protect the integration circuit through the processor to prevent the device from overcharging or over-discharging.

[0051] Furthermore, in the embodiment of the present application, before the step of obtaining the main path current sent from the first current sampling unit and calculating the initial main path power, the following steps are also included:

[0052] detecting whether there is current on the first current sampling unit;

[0053] If so, the circuit between the second branch and the first branch is connected, and the steps of obtaining the main path current sent from the first current sampling unit and calculating the initial main path power are performed;

[0054] If not, the loop between the second branch and the first branch is disconnected.

[0055] Exemplarily, when the hardware integrator is an energy storage device mainly composed of a capacitor, a supercapacitor, a battery, etc., it is necessary to control the hardware integration loop through the current on the first current sampling unit. That is, when there is no current on the first current sampling unit, the loop between the second branch and the first branch is disconnected; when there is current on the first current sampling unit, the loop between the first branch and the second branch is connected.

[0056] Step S40: calibrate the initial main path power according to the actual second branch power and the power proportional coefficient to obtain the actual main path power, and calculate the remaining power of the battery system according to the actual main path power and the initial power of the battery system.

[0057] For example, in an embodiment of the present application, the initial main path power C1 is calibrated by the actual second branch power C2' and the power proportional coefficient k to obtain the actual main path power C1' passing through the main path, that is, C1'=k×C2'=C1 / C2×C2', and C1' is the power consumed or obtained by the battery system. Then, the remaining battery power can be accurately calculated based on the actual main path power C1' and the initial power of the battery system.

[0058] It can be seen that this application can perform real-time current acquisition and power calculation on the main path and the first branch, and perform real-time integration of the current on the second branch based on the hardware integrator to obtain the real-time power on the second branch. The initial main path power on the main path is calibrated with the real-time power on the second branch to obtain the real power actually consumed on the main path, that is, the real power consumed by the battery, and the remaining battery power is calculated based on this. There is no need for ADC conversion and periodic sampling, thereby avoiding the errors caused by ADC conversion and the cumulative errors caused by periodic sampling, and obtaining higher integration accuracy, thereby effectively improving the accuracy of the remaining power estimation of the battery system.

[0059] See also Figure 2 As shown, an embodiment of the present application further provides a battery system remaining power estimation device, comprising: a processor, a first current sampling unit, a second current sampling unit, and a hardware integrator; the processor is electrically connected to 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 connected to the battery system;

[0060] Wherein, the first current sampling unit is provided on the main path and is used to collect the main path current of the main path;

[0061] The second current sampling unit is provided on the first branch and is used to collect the first branch current of the first branch;

[0062] The hardware integrator is provided on the second branch and is used to integrate the current flowing through the second branch to obtain the actual second branch electric quantity;

[0063] The processor is configured to: obtain a main path current from the first current sampling unit and calculate an initial main path charge, obtain a first branch current from the second current sampling unit and calculate an initial first branch charge; determine an initial second branch charge based on the initial main path charge and the initial first branch charge, and calculate a charge proportional coefficient between the main path and the second branch based on the initial main path charge and the initial second branch charge; obtain an actual second branch charge from the hardware integrator, calibrate the initial main path charge based on the actual second branch charge and the charge proportional coefficient to obtain an actual main path charge, and calculate a remaining charge of the battery system based on the actual main path charge and the initial charge of the battery system.

[0064] Exemplarily, in this embodiment, the first current sampling unit and the second current sampling unit are connected in series to the first pole (i.e., the positive pole) of the battery system, and the negative pole of the battery system forms a closed loop with the first branch and the second branch through the L / C (i.e., the load or charger, etc.); the current on the main path is then collected by the first current sampling unit, and the processor obtains the current on the main path from the first current sampling unit and calculates the initial main path power C1 on the main path based on the ampere-hour integration or Ford ampere-hour integration method; after passing through the first current sampling unit, the current on the main path flows to the first branch and the second branch respectively, and the current on the first branch is collected by the second current sampling unit. The processor obtains the current on the first branch from the first current sampling unit and calculates the initial first branch power C3 on the first branch. It should be noted that Figure 2 Although only two branches (i.e., the first branch and the second branch) are shown, the circuit can be adjusted according to actual needs, that is, the branches of the main path include not only the first branch and the second branch, but also the third branch and the fourth branch, etc., and current sampling units are correspondingly set on the corresponding third branch and the fourth branch to collect the current on the corresponding branch.

[0065] The processor calculates the initial second branch charge C2 on the second branch based on the initial main path charge C1 and the initial first branch charge C3 obtained by integration, that is, C2 = C1-C3; then determines the charge proportional coefficient k between the main path and the second branch based on the initial main path charge C1 and the initial second branch charge C2, that is, k = C1 / C2; since there is a hardware integrator on the second branch, the real charge passing through the second branch, that is, the actual second branch charge C2', can be directly integrated by the hardware integrator; then the initial main path charge C1 is calibrated by the actual second branch charge C2' and the charge proportional coefficient k to obtain the actual main path charge C1' passing through the main path, that is, C1' = k×C2' = C1 / C2×C2', and C1' is the charge consumed or obtained by the battery system, and then the remaining battery charge can be accurately calculated based on the actual main path charge C1' and the initial charge of the battery system.

[0066] It can be seen that the first current sampling unit and the second current sampling unit in the present application can collect real-time current from the main path and the first branch and calculate the power through the processor, and the current on the second branch is integrated in real time based on the hardware integrator to obtain the real-time power on the second branch. The processor then calibrates the initial main path power on the main path through the real-time power on the second branch to obtain the real power actually consumed on the main path, that is, the real power consumed by the battery, and calculates the remaining power of the battery based on this, without the need for ADC conversion and periodic sampling, thereby avoiding the errors caused by ADC conversion and the cumulative errors caused by periodic sampling, and obtaining higher integration accuracy, thereby effectively improving the accuracy of the remaining power estimation of the battery system.

[0067] Furthermore, in an embodiment of the present application, the hardware integrator is a hardware integration circuit or an energy storage device for determining capacity according to voltage.

[0068] Exemplarily, the hardware integrator in this embodiment can be a hardware integration circuit, or it can be a simple energy storage device mainly composed of a capacitor, a supercapacitor, or a battery, etc., whose capacity can be directly determined by voltage. The specific configuration can be determined according to actual needs and is not limited here.

[0069] When the hardware integrator is an energy storage device mainly composed of capacitors, supercapacitors or batteries, the circuit composition of the hardware integrator can be found in Figure 3 As shown, the ternary battery is preferably used as the core device of the hardware integrator. Figure 3In the figure, I is the isolation circuit of the hardware integrator, G is the amplifier circuit, S1 and S2 are MOS tubes, A and B are current input and output (depending on the charging and discharging, A can be set as output and B as input), E is the battery, and M is the interface between the hardware integrator and the processor. The interface can be a communication interface, and the processor controls M through communication to open or close S2. M directly collects the voltage of E and transmits it to the processor through communication. The interface can also be an analog interface, and the processor directly collects the voltage of E and controls the opening and closing of S2 through analog signals.

[0070] Therefore, when the battery system is discharging, current flows from A into battery E and then out of B, charging battery E. (E can also be connected in reverse; when the battery system is discharging, E also discharges.) When the battery system is charging, current flows from B into battery E and then out of A, discharging battery E. (E can also be connected in reverse; when the battery system is charging, E also charges.) This shows that by acquiring the voltage of battery E, the capacity of battery E can be determined, which can then be used to calculate the capacity of the battery through the hardware integrator.

[0071] Furthermore, in an embodiment of the present application, the processor is further configured to:

[0072] detecting whether there is current on the first current sampling unit;

[0073] If so, the circuit between the second branch and the first branch is connected, and the steps of obtaining the main path current from the first current sampling unit and calculating the initial main path power are performed;

[0074] If not, the loop between the second branch and the first branch is disconnected.

[0075] The first current sampling unit is connected in a forward connection manner, and the second current sampling unit is connected in a reverse connection manner.

[0076] Furthermore, in an embodiment of the present application, the first current sampling unit is connected in a forward connection manner, and the second current sampling unit is connected in a reverse connection manner.

[0077] For example, the first current sampling unit and the second current sampling unit in this embodiment can be connected in opposite directions. For example, the first current sampling unit is connected in a forward direction, and the second current sampling unit is connected in a reverse direction. During calculation, one of the current sampling units is inverted to eliminate the influence of temperature drift on the resistance of the current sampling unit, thereby improving accuracy.

[0078] Furthermore, in an embodiment of the present application, the first current sampling unit is a shunt or a current sensor; the second current sampling unit is a shunt or a current sensor.

[0079] It should be noted that those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the above-described devices and units can refer to the corresponding processes in the aforementioned battery system remaining power estimation method embodiment, and will not be repeated here.

[0080] An embodiment of the present application further provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, all or part of the steps of the aforementioned method for estimating the remaining power of the battery system are implemented.

[0081] The embodiments of the present application implement all or part of the aforementioned processes, and may also be completed by instructing related hardware through a computer program. The computer program may be stored in a computer-readable storage medium, and when the computer program is executed by a processor, the steps of each of the above methods may be implemented. Among them, the computer program includes computer program code, and the computer program code may be in source code form, object code form, executable file or some intermediate form. The computer-readable medium may include: any entity or device capable of carrying computer program code, recording medium, USB flash drive, mobile hard disk, magnetic disk, optical disk, computer memory, read-only memory (ROM), random access memory (RAM), electric carrier signal, telecommunication signal and software distribution medium, etc. It should be noted that the content contained in the computer-readable medium may be appropriately increased or decreased according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, computer-readable media do not include electric carrier signals and telecommunication signals.

[0082] Those skilled in the art will appreciate that embodiments of the present invention may be provided as methods, systems, servers, or computer program products. Thus, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware. Furthermore, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage and optical storage) containing computer-usable program code.

[0083] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems) and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowcharts and / or block diagrams, as well as combinations of processes and / or blocks in the flowcharts and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowcharts and / or block diagrams. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0084] It should be noted that, in this document, the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, article, or system comprising a series of elements includes not only those elements but also other elements not explicitly listed, or elements inherent to such process, method, article, or system. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or system comprising the element.

[0085] The foregoing is merely a list of specific embodiments of the present application, intended to enable those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application is not limited to the embodiments shown herein, but is intended to conform to the broadest scope consistent with the principles and novel features of the present application.

Claims

1. A method for estimating the remaining power of a battery system, characterized in that: The following steps are involved: Obtaining the main path current sent from the first current sampling unit and calculating the initial main path power, obtaining the first branch current sent from the second current sampling unit and calculating the initial first branch power; Determining an initial second branch power according to the initial main path power and the initial first branch power, and calculating a power ratio coefficient between the main path and the second branch according to the initial main path power and the initial second branch power; Obtaining an actual second branch electric quantity sent by a hardware integrator, where the actual second branch electric quantity is obtained by integrating the current flowing through the second branch by the hardware integrator, and the hardware integrator is a hardware integration circuit or an energy storage device for determining capacity according to voltage; Calibrate the initial main path power according to the actual second branch power and the power proportional coefficient to obtain the actual main path power, and calculate the remaining power of the battery system according to the actual main path power and the initial power of the battery system; Wherein, when the hardware integrator is an energy storage device for determining capacity according to voltage, before the step of obtaining the main path current sent from the first current sampling unit and calculating the initial main path power, the method further includes: detecting whether there is current on the first current sampling unit; If so, the circuit between the second branch and the first branch is connected, and the steps of obtaining the main path current sent from the first current sampling unit and calculating the initial main path power are performed; If not, the loop between the second branch and the first branch is disconnected.

2. The method for estimating remaining battery capacity of a battery system according to claim 1, wherein: The first current sampling unit is a shunt or a current sensor; the second current sampling unit is a shunt or a current sensor.

3. A battery system remaining power estimation device, characterized in that: include: A processor, a first current sampling unit, a second current sampling unit, and a hardware integrator, wherein the hardware integrator is a hardware integration circuit or an energy storage device for determining capacity according to voltage; The processor is electrically connected to 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 connected to the battery system; Wherein, the first current sampling unit is provided on the main path and is used to collect the main path current of the main path; The second current sampling unit is provided on the first branch and is used to collect the first branch current of the first branch; The hardware integrator is provided on the second branch and is used to integrate the current flowing through the second branch to obtain the actual second branch electric quantity; The processor is configured to: obtain a main path current from the first current sampling unit and calculate an initial main path power, obtain a first branch current from the second current sampling unit and calculate an initial first branch power; determine an initial second branch power based on the initial main path power and the initial first branch power, and calculate a power proportional coefficient between the main path and the second branch based on the initial main path power and the initial second branch power; obtain an actual second branch power from the hardware integrator, calibrate the initial main path power based on the actual second branch power and the power proportional coefficient to obtain an actual main path power, and calculate a remaining power of the battery system based on the actual main path power and the initial power of the battery system; When the hardware integrator is an energy storage device for determining capacity based on voltage, the processor is further configured to: detect whether current exists on the first current sampling unit; if so, connect the loop between the second branch and the first branch, and execute the steps of obtaining the main path current from the first current sampling unit and calculating the initial main path power; if not, disconnect the loop between the second branch and the first branch.

4. The battery system remaining capacity estimation device according to claim 3, wherein: The first current sampling unit is connected in a forward connection manner, and the second current sampling unit is connected in a reverse connection manner.

5. The battery system remaining capacity estimation device according to claim 3, wherein: The first current sampling unit is a shunt or a current sensor; the second current sampling unit is a shunt or a current sensor.

6. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the method for estimating the remaining power of a battery system according to claim 1 or 2 is implemented.

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