Method, system, device and medium for offset correction of battery discharge curve

Abstract

The application relates to a method, system, device and medium for offset correction of a battery discharge curve, wherein the method comprises the following steps: obtaining a calibration battery discharge curve relationship, the calibration battery discharge curve relationship representing the relationship among a calibration discharge voltage, a calibration discharge current and a calibration battery state of charge; obtaining an aging battery offset voltage according to the battery state of charge at each moment; constructing a discharge curve offset correction model based on the calibration battery discharge curve relationship and the aging battery offset voltage; obtaining parameters of the discharge curve offset correction model, and obtaining a discharge curve offset correction result according to the battery state of charge at each moment based on the parameters. The method solves the problems of high cost and long time consumption of offset correction of the battery discharge curve in the related art, improves the efficiency of offset correction of the battery discharge curve and reduces the offset correction cost.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to methods, systems, devices, and media for correcting the offset of battery discharge curves. Background Technology

[0002] Storage batteries are widely used in industrial fields. These applications often require pre-obtaining discharge curve test data at different discharge rates to track and calculate the battery's state of charge and health. However, as batteries age, the experimentally measured calibration curve data deviates, rendering the experimental calibration data invalid.

[0003] At this point, the existing method is to re-perform the discharge calibration experiment for batteries whose calibration curve data has drifted. However, this method is costly and time-consuming because it requires interfering with the normal operation of the system. Summary of the Invention

[0004] This application provides a method, system, device, and medium for correcting the offset of a battery discharge curve, so as to at least solve the problems of high cost and long time consumption in the related art for correcting the offset of a battery discharge curve.

[0005] In a first aspect, embodiments of this application provide a method for correcting the offset of a battery discharge curve, the method comprising:

[0006] Obtain the discharge curve relationship of the calibration battery, which characterizes the relationship between the calibration discharge voltage, calibration discharge current and calibration battery state of charge;

[0007] The offset voltage of the aged battery is obtained based on the state of charge of the aged battery at each time point.

[0008] Based on the relationship between the calibrated battery discharge curve and the offset voltage of the aged battery, a discharge curve offset correction model is constructed.

[0009] Obtain the parameters of the discharge curve offset correction model, and based on the parameters, obtain the discharge curve offset correction result according to the state of charge of the aged battery at each time point.

[0010] In one embodiment, a discharge curve offset correction model is constructed based on the calibrated battery discharge curve relationship and the aging battery offset voltage, including:

[0011] A discharge curve offset correction model is constructed by combining the relationship between the calibrated battery discharge curve and the offset voltage of the aged battery.

[0012] In one embodiment, a discharge curve offset correction model is constructed by combining the calibrated battery discharge curve relationship with the aging battery offset voltage, including:

[0013] The relationship between the calibration battery discharge curve and V unaged =f(I,SOC) and the offset voltage of the aged battery Combined, a discharge curve offset correction model is constructed. Where SOC0, a, and b are the parameters of the discharge curve offset correction model to be performed, SOC0 is the preset initial state of charge of the aged battery, and ΔT k-1,k The sampling interval is denoted by I, where I is the discharge current of the aging battery and C is the capacity of the aging battery.

[0014] In one embodiment, before obtaining the aging battery offset voltage based on the aging battery state of charge at each time point, the method further includes:

[0015] Acquire aging battery data, wherein the aging battery data includes aging battery discharge voltage, aging battery discharge current and sampling intervals at various times, wherein the sampling intervals at various times are used to collect the aging battery discharge voltage and aging battery discharge current at preset time intervals; the preset initial state of charge of the aging battery is the target parameter.

[0016] Based on the initial state of charge (SOC) of the aged battery, the sampling interval at each time point, the discharge current of the aged battery, and the capacity of the aged battery, the SOC of the aged battery at each time point is obtained. Where SOC0 is the preset initial state of charge of the aged battery, ΔT k-1,k The sampling interval is denoted by I, where I is the discharge current of the aging battery and C is the capacity of the aging battery.

[0017] In one embodiment, obtaining the aging battery offset voltage based on the state of charge of the aging battery at each time point includes:

[0018] Based on the state of charge of the aging battery at each time point Obtain the offset voltage of the aged battery Where i>0, SOC0, a, and b are the parameters of the discharge curve offset correction model to be performed, SOC0 is the preset initial state of charge of the aged battery, and ΔT k-1,k The sampling interval is denoted by I, where I is the discharge current of the aging battery and C is the capacity of the aging battery.

[0019] In one embodiment, the method of obtaining the parameters of the discharge curve offset correction model includes:

[0020] Based on the state of charge and aging battery data at each time point, the parameters of the discharge curve offset correction model are obtained according to the discharge curve offset correction model.

[0021] In one embodiment, based on the parameters and according to the state of charge of the aged battery at each time point, the discharge curve offset correction result is obtained, including:

[0022] Based on the parameter SOC0, according to the state of charge of the aged battery at each time point Where SOC0 is the preset initial state of charge of the aged battery, ΔT k-1,k is the sampling interval at each time point, I is the discharge current of the aged battery, and C is the discharge curve offset correction result obtained from the aged battery capacity.

[0023] Secondly, embodiments of this application provide a system for correcting the offset of a battery discharge curve. The system includes a module for acquiring the relationship between calibrated battery discharge curves, a module for acquiring the offset voltage of an aged battery, a module for constructing a discharge curve offset correction model, and a module for acquiring the discharge curve offset correction result, wherein:

[0024] The module for obtaining the discharge curve relationship of the calibration battery is used to obtain the discharge curve relationship of the calibration battery, wherein the discharge curve relationship of the calibration battery represents the relationship between the calibration discharge voltage, the calibration discharge current and the state of charge of the calibration battery.

[0025] The module for obtaining the offset voltage of the aged battery is used to obtain the offset voltage of the aged battery based on the state of charge of the aged battery at each time.

[0026] A discharge curve offset correction model module is constructed based on the discharge curve relationship of the calibrated battery and the offset voltage of the aged battery.

[0027] The module for obtaining discharge curve offset correction results is used to obtain the parameters of the discharge curve offset correction model, and based on the parameters, obtain the discharge curve offset correction results according to the state of charge of the aged battery at each time.

[0028] Thirdly, embodiments of this application provide a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements a method for offset correction of a battery discharge curve as described in the first aspect above.

[0029] Fourthly, embodiments of this application provide a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements a method for offset correction of a battery discharge curve as described in the first aspect above.

[0030] The method, system, device, and medium for offset correction of battery discharge curves provided in this application have at least the following technical effects.

[0031] By obtaining the discharge curve relationship of the calibrated battery, which characterizes the relationship between the calibrated discharge voltage, calibrated discharge current, and calibrated battery state of charge, and obtaining the aging battery offset voltage based on the aging battery state of charge at each time point, a discharge curve offset correction model is constructed based on the calibrated battery discharge curve relationship and the aging battery offset voltage. The parameters of the discharge curve offset correction model are obtained, and based on the parameters and the aging battery state of charge at each time point, the discharge curve offset correction result is obtained. This application constructs a discharge curve offset correction model using the calibrated battery discharge curve relationship and the aging battery offset voltage, and then obtains the discharge curve offset correction result based on the model. This solves the problems of high cost and long time consumption in related technologies for battery discharge curve offset correction, improving the efficiency of battery discharge curve offset correction and reducing the cost of offset correction.

[0032] Details of one or more embodiments of this application are set forth in the following drawings and description to make other features, objects and advantages of this application more readily apparent. Attached Figure Description

[0033] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0034] Figure 1 This is a flowchart for correcting the offset of a battery discharge curve;

[0035] Figure 2 This is a structural block diagram illustrating a system for correcting the offset of a battery discharge curve according to an exemplary embodiment;

[0036] Figure 3 This is a structural block diagram of an electronic device according to an exemplary embodiment. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of this application clearer, the application is described and illustrated below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application. All other embodiments obtained by those skilled in the art based on the embodiments provided in this application without inventive effort are within the scope of protection of this application.

[0038] Obviously, the accompanying drawings described below are merely some examples or embodiments of this application. Those skilled in the art can apply this application to other similar scenarios based on these drawings without any inventive effort. Furthermore, it is understood that although the efforts made in this development process may be complex and lengthy, for those skilled in the art related to the content disclosed in this application, any changes to design, manufacturing, or production based on the technical content disclosed in this application are merely conventional technical means and should not be construed as insufficient disclosure of the content of this application.

[0039] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application may be combined with other embodiments without conflict.

[0040] Unless otherwise defined, the technical or scientific terms used in this application shall have the ordinary meaning understood by one of ordinary skill in the art to which this application pertains. The terms “a,” “an,” “an,” “the,” and similar words used in this application do not indicate quantity limitation and may indicate singular or plural. The terms “comprising,” “including,” “having,” and any variations thereof used in this application are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or device that includes a series of steps or modules (units) is not limited to the listed steps or units, but may also include steps or units not listed, or may include other steps or units inherent to these processes, methods, products, or devices. The terms “connected,” “linked,” “coupled,” and similar words used in this application are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. “Multiple” used in this application refers to two or more. “And / or” describes the relationship between related objects, indicating that three relationships may exist; for example, “A and / or B” can represent: A alone, A and B simultaneously, and B alone. The character " / " generally indicates that the preceding and following objects are in an "or" relationship. The terms "first," "second," and "third" used in this application are merely to distinguish similar objects and do not represent a specific ordering of the objects.

[0041] Firstly, embodiments of this application provide a method for correcting the offset of a battery discharge curve. Figure 1 This is a flowchart for correcting the offset of a battery discharge curve, such as... Figure 1As shown, a method for correcting the offset of a battery discharge curve includes:

[0042] Step S101: Obtain the discharge curve relationship of the calibration battery. The discharge curve relationship of the calibration battery represents the relationship between the calibration discharge voltage, calibration discharge current and calibration battery state of charge.

[0043] Step S102: Obtain the aging battery offset voltage based on the state of charge of the aging battery at each time point.

[0044] Step S103: Based on the relationship between the calibrated battery discharge curve and the offset voltage of the aged battery, construct a discharge curve offset correction model.

[0045] Step S104: Obtain the parameters of the discharge curve offset correction model. Based on the parameters and the state of charge of the aged battery at each time point, obtain the discharge curve offset correction result.

[0046] In summary, the battery discharge curve offset correction method provided in this application obtains the relationship between the calibrated battery discharge curve and the calibrated discharge current, which characterizes the relationship between the calibrated discharge voltage, calibrated discharge current, and calibrated battery state of charge. Based on the state of charge of the aged battery at each time point, the aging battery offset voltage is obtained. A discharge curve offset correction model is constructed based on the calibrated battery discharge curve relationship and the aging battery offset voltage. The parameters of the discharge curve offset correction model are obtained, and based on the parameters and the state of charge of the aged battery at each time point, the discharge curve offset correction result is obtained. This application constructs a discharge curve offset correction model by calibrating the battery discharge curve relationship and the aging battery offset voltage, and then obtains the discharge curve offset correction result based on the model. This solves the problems of high cost and long time consumption in related technologies for battery discharge curve offset correction, improving the efficiency of battery discharge curve offset correction and reducing the cost of offset correction.

[0047] In one embodiment, step S101 involves obtaining the discharge curve relationship of the calibration battery. The discharge curve relationship of the calibration battery characterizes the relationship between the calibration discharge voltage, calibration discharge current, and calibration battery state of charge. Specifically, this includes:

[0048] Optionally, the relationship between the discharge voltage V, discharge current I, and battery state of charge (SOC) is calibrated through a discharge experiment to obtain the discharge curve relationship of the calibrated battery, denoted as: V unaged = f(I, SOC). It is worth noting that the calibrated battery discharge curve relationship is for unaged batteries. By calibrating the battery discharge curve relationship, a standard battery discharge curve relationship can be obtained, which can be used to calibrate the offset voltage of subsequently aged batteries.

[0049] In one embodiment, before obtaining the aging battery offset voltage based on the aging battery state of charge at each time point in step S102, the battery discharge curve offset correction method further includes:

[0050] Acquire aging battery data, wherein the aging battery data includes aging battery discharge voltage, aging battery discharge current and sampling intervals at various times, wherein the sampling intervals at various times are used to collect the aging battery discharge voltage and aging battery discharge current at preset time intervals; the preset initial state of charge of the aging battery is the target parameter.

[0051] Based on the initial state of charge (SOC) of the aged battery, the sampling interval at each time point, the discharge current of the aged battery, and the capacity of the aged battery, the SOC of the aged battery at each time point is obtained. Where SOC0 is the preset initial state of charge of the aged battery, ΔT k-1,k The sampling interval is denoted by I, where I is the discharge current of the aging battery and C is the capacity of the aging battery.

[0052] Optionally, aging battery data is collected by the BMS system. This aging battery data includes aging discharge voltages V0, V1, V2, V3, ... V. i (i represents each time point), aging battery discharge current I0, I1, I2, I3, ... I i (i represents each time point) and the sampling interval ΔT at each time point i-1,i (Time interval from time i-1 to time i), sampling interval ΔT at each time point i-1,i The timeframe can be determined based on the actual time. The initial state of charge (SOC0) of the aged battery is preset as the target parameter. The sampling intervals at each time point are used to collect the discharge voltage and discharge current of the aged battery at preset time intervals. The aged battery data collected by the BMS system provides the data foundation for constructing the state of charge of the aged battery at each time point.

[0053] Based on the initial state of charge (SOC0) of the aged battery and the sampling interval ΔT at each time point i-1,i The state of charge (SOC) of the aged battery is obtained by measuring the discharge current I and capacity C at different times. This is achieved by setting the initial SOC of the aged battery as an unknown parameter (SOC0) and using the ampere-hour integration method to derive the SOC expression for each discharge moment. The subscript i indicates the i-th sampling time. The state of charge of the aged battery provides the basis for obtaining the offset voltage of the aged battery.

[0054] In one embodiment, step S102 involves obtaining the aging battery offset voltage based on the state of charge of the aging battery at each time point.

[0055] Optionally, considering the impact of aging on battery voltage, under the same battery state of charge (SOC), aging will cause the battery voltage to deviate. This aging offset voltage is then considered, and the SOC is denoted as... i It is a true linear function, that is, based on the state of charge (SOC) of the aged battery at each time step. i Obtain the offset voltage of the aged battery Where i>0, SOC0, a, and b are the model parameters to be solved. The aging battery offset voltage is the discharge voltage offset of the aging battery at each discharge moment. By obtaining the aging battery offset voltage, the relationship between the aging battery offset voltage and the calibrated battery discharge curve can be combined to obtain the corrected offset discharge curve.

[0056] In one embodiment, step S103, constructing a discharge curve offset correction model based on the calibrated battery discharge curve relationship and the aging battery offset voltage, includes:

[0057] A discharge curve offset correction model is constructed by combining the calibrated battery discharge curve relationship with the aging battery offset voltage.

[0058] Optionally, by calibrating the battery discharge curve relationship V unaged =f(I,SOC) and the offset voltage of the aging battery Combined, a discharge curve offset correction model is constructed. Where SOC0, a, and b are the model parameters to be solved. Based on the relationship between the calibrated battery discharge curve and the offset voltage of the aged battery, a discharge curve offset correction model is constructed, which can quickly obtain the offset discharge curve after correction.

[0059] In one embodiment, step S104 involves obtaining the parameters of the discharge curve offset correction model, and based on the parameters, obtaining the discharge curve offset correction result according to the state of charge of the aged battery at each time.

[0060] Optionally, by obtaining each sampling point in the aging data and substituting it into the discharge curve offset correction model, the following can be obtained:

[0061]

[0062] Substitute into SOC i The above equation can be expressed as:

[0063] V i =g(I i ,SOC0,a,b),i=0,1,2,3,...,n

[0064] Where g(SOC0,a,b) is a linear or nonlinear function of SOC0,a,b, the parameters to be solved can be obtained by using linear or nonlinear least squares methods.

[0065] In one embodiment, the discharge curve offset correction result is obtained based on parameters and the state of charge of the aged battery at each time point.

[0066] Optionally, based on the parameter SOC0, according to the state of charge of the aged battery at each time point. Obtain the discharge curve offset correction result (I) i V i SOC i ).

[0067] In summary, the battery discharge curve offset correction method provided in this application obtains the relationship between the calibrated battery discharge curve and the calibrated discharge current, which characterizes the relationship between the calibrated discharge voltage, calibrated discharge current, and calibrated battery state of charge. Based on the state of charge of the aged battery at each time point, the aging battery offset voltage is obtained. A discharge curve offset correction model is constructed based on the calibrated battery discharge curve relationship and the aging battery offset voltage. The parameters of the discharge curve offset correction model are obtained, and based on the parameters and the state of charge of the aged battery at each time point, the discharge curve offset correction result is obtained. This application constructs a discharge curve offset correction model by calibrating the battery discharge curve relationship and the aging battery offset voltage, and then obtains the discharge curve offset correction result based on the model. This solves the problems of high cost and long time consumption in related technologies for battery discharge curve offset correction, improving the efficiency of battery discharge curve offset correction and reducing the cost of offset correction.

[0068] Secondly, embodiments of this application provide a system for correcting the offset of a battery discharge curve. Figure 2 This is a block diagram illustrating a system for correcting the offset of a battery discharge curve according to an exemplary embodiment. Figure 2 As shown, the system includes a module for obtaining the discharge curve relationship of the calibrated battery, a module for obtaining the offset voltage of the aged battery, a module for constructing a discharge curve offset correction model, and a module for obtaining the discharge curve offset correction result, wherein:

[0069] The module for obtaining the discharge curve relationship of the calibration battery is used to obtain the discharge curve relationship of the calibration battery. The discharge curve relationship of the calibration battery represents the relationship between the calibration discharge voltage, the calibration discharge current and the state of charge of the calibration battery.

[0070] The module for obtaining the offset voltage of the aged battery is used to obtain the offset voltage of the aged battery based on the state of charge of the aged battery at each time.

[0071] A discharge curve offset correction model module is constructed, which is based on the relationship between the discharge curves of the calibrated battery and the offset voltage of the aged battery.

[0072] The module for obtaining discharge curve offset correction results is used to obtain the parameters of the discharge curve offset correction model. Based on the parameters, the discharge curve offset correction results are obtained according to the state of charge of the aged battery at each time.

[0073] In summary, this application provides a system for correcting the offset of a battery discharge curve. It comprises a module for acquiring the calibrated battery discharge curve relationship, a module for acquiring the offset voltage of an aged battery, a module for constructing a discharge curve offset correction model, and a module for obtaining the discharge curve offset correction result. By calibrating the battery discharge curve relationship and the offset voltage of the aged battery, a discharge curve offset correction model is constructed, and the discharge curve offset correction result is obtained based on the model. This solves the problems of high cost and long time consumption in related technologies for battery discharge curve offset correction, improving the efficiency of battery discharge curve offset correction and reducing the cost.

[0074] It should be noted that the battery discharge curve offset correction system provided in this embodiment is used to implement the above-described embodiments, and details already described will not be repeated. As used above, terms such as "module," "unit," and "subunit" can refer to a combination of software and / or hardware that performs a predetermined function. Although the apparatus described in the above embodiments is preferably implemented in software, hardware implementation, or a combination of software and hardware, is also possible and contemplated.

[0075] Thirdly, embodiments of this application provide an electronic device, Figure 3 This is a block diagram illustrating an electronic device according to an exemplary embodiment. (e.g.) Figure 3 As shown, the electronic device may include a processor 31 and a memory 32 storing computer program instructions.

[0076] Specifically, the processor 31 may include a central processing unit (CPU), an application specific integrated circuit (ASIC), or one or more integrated circuits that can be configured to implement the embodiments of this application.

[0077] The memory 32 may include a mass storage device for data or instructions. For example, and not limitingly, the memory 32 may include a hard disk drive (HDD), a floppy disk drive, a solid-state drive (SSD), flash memory, an optical disk drive, a magneto-optical disk drive, magnetic tape, or a Universal Serial Bus (USB) drive, or a combination of two or more of these. Where appropriate, the memory 32 may include removable or non-removable (or fixed) media. Where appropriate, the memory 32 may be internal or external to a data processing device. In a particular embodiment, the memory 32 is non-volatile memory. In a particular embodiment, the memory 32 includes read-only memory (ROM) and random access memory (RAM). Where appropriate, the ROM may be a mask-programmed ROM, a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable programmable read-only memory (EEPROM), an electrically alterable read-only memory (EAROM), or flash memory, or a combination of two or more of these. Where appropriate, the RAM can be Static Random-Access Memory (SRAM) or Dynamic Random-Access Memory (DRAM). DRAM can be Fast Page Mode Dynamic Random-Access Memory (FPMDRAM), Extended Data Out Dynamic Random-Access Memory (EDODRAM), Synchronous Dynamic Random-Access Memory (SDRAM), etc.

[0078] The memory 32 can be used to store or cache various data files that need to be processed and / or used for communication, as well as possible computer program instructions executed by the processor 31.

[0079] The processor 31 reads and executes the computer program instructions stored in the memory 32 to implement any of the battery discharge curve offset correction methods in the above embodiments.

[0080] In one embodiment, a device for correcting the offset of a battery discharge curve may further include a communication interface 33 and a bus 30. Wherein, as Figure 3 As shown, the processor 31, memory 32, and communication interface 33 are connected through bus 30 and complete communication with each other.

[0081] The communication interface 33 is used to enable communication between the various modules, devices, units, and / or equipment in the embodiments of this application. The communication port 33 can also enable data communication with other components such as external devices, image / data acquisition devices, databases, external storage, and image / data processing workstations.

[0082] Bus 30 includes hardware, software, or both, that couples together components of a device for correcting the offset of a battery discharge curve. Bus 30 includes, but is not limited to, at least one of the following: data bus, address bus, control bus, expansion bus, and local bus. For example, and not as a limitation, bus 30 may include an Accelerated Graphics Port (AGP) or other graphics bus, an Extended Industry Standard Architecture (EISA) bus, a Front Side Bus (FSB), a HyperTransport (HT) interconnect, an Industry Standard Architecture (ISA) bus, an InfiniBand interconnect, a Low Pin Count (LPC) bus, a memory bus, a Micro Channel Architecture (MCA) bus, a Peripheral Component Interconnect (PCI) bus, a PCI-Express (PCI-X) bus, a Serial Advanced Technology Attachment (SATA) bus, a Video Electronics Standards Association Local Bus (VLB) bus, or other suitable buses, or a combination of two or more of these. Where appropriate, bus 30 may include one or more buses. Although specific buses are described and illustrated in the embodiments of this application, this application considers any suitable bus or interconnection.

[0083] Fourthly, embodiments of this application provide a computer-readable storage medium having a program stored thereon, which, when executed by a processor, implements a method for correcting the offset of a battery discharge curve provided in the first aspect.

[0084] The readable storage medium may be more specifically adopted, including but not limited to: portable disk, hard disk, random access memory, read-only memory, erasable programmable read-only memory, optical storage device, magnetic storage device, or any suitable combination thereof.

[0085] In a possible implementation, the present invention can also be implemented as a program product comprising program code that, when the program product is run on a terminal device, causes the terminal device to perform steps implementing a method for offset correction of a battery discharge curve provided in the first aspect.

[0086] The program code for executing the present invention can be written in any combination of one or more programming languages. The program code can be executed entirely on the user device, partially on the user device, as a standalone software package, partially on the user device and partially on a remote device, or entirely on a remote device.

[0087] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0088] The above embodiments merely illustrate several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A method for correcting the offset of a battery discharge curve, characterized in that, The method includes: Obtain the discharge curve relationship of the calibration battery, which characterizes the relationship between the calibration discharge voltage, calibration discharge current and calibration battery state of charge; The offset voltage of the aged battery is obtained based on the state of charge of the aged battery at each time point. Based on the relationship between the calibrated battery discharge curve and the offset voltage of the aged battery, a discharge curve offset correction model is constructed. Obtain the parameters of the discharge curve offset correction model, and based on the parameters, obtain the discharge curve offset correction result according to the state of charge of the aged battery at each time point.

2. The method according to claim 1, characterized in that, Based on the discharge curve relationship of the calibrated battery and the offset voltage of the aged battery, a discharge curve offset correction model is constructed, including: A discharge curve offset correction model is constructed by combining the relationship between the calibrated battery discharge curve and the offset voltage of the aged battery.

3. The method according to claim 2, characterized in that, By combining the discharge curve relationship of the calibrated battery with the offset voltage of the aged battery, a discharge curve offset correction model is constructed, including: The relationship between the calibration battery discharge curve and V unaged =f(I,SOC) and the offset voltage of the aged battery Combined, a discharge curve offset correction model is constructed. Where SOC0, a, and b are the parameters of the discharge curve offset correction model to be performed, SOC0 is the preset initial state of charge of the aged battery, and ΔT k-1,k The sampling interval is denoted by I, where I is the discharge current of the aging battery and C is the capacity of the aging battery.

4. The method according to claim 1, characterized in that, Before obtaining the aging battery offset voltage based on the aging battery state of charge at each time point, the method further includes: Acquire aging battery data, wherein the aging battery data includes aging battery discharge voltage, aging battery discharge current and sampling intervals at various times, wherein the sampling intervals at various times are used to collect the aging battery discharge voltage and aging battery discharge current at preset time intervals; the preset initial state of charge of the aging battery is the target parameter. Based on the initial state of charge (SOC) of the aged battery, the sampling interval at each time point, the discharge current of the aged battery, and the capacity of the aged battery, the SOC of the aged battery at each time point is obtained. Where SOC0 is the preset initial state of charge of the aged battery, ΔT k-1,k The sampling interval is denoted by I, where I is the discharge current of the aging battery and C is the capacity of the aging battery.

5. The method according to claim 4, characterized in that, Based on the state-of-charge expression of the aged battery at each time point, the offset voltage expression of the aged battery is obtained, including: Based on the state of charge of the aging battery at each time point Obtain the offset voltage of the aged battery Where i>0, SOC0, a, and b are the parameters of the discharge curve offset correction model to be performed, SOC0 is the preset initial state of charge of the aged battery, and ΔT k-1,k The sampling interval is denoted by I, where I is the discharge current of the aging battery and C is the capacity of the aging battery.

6. The method according to claim 1, characterized in that, Obtaining the parameters of the discharge curve offset correction model includes: Based on the state of charge and aging battery data at each time point, the parameters of the discharge curve offset correction model are obtained according to the discharge curve offset correction model.

7. The method according to claim 1, characterized in that, Based on the parameters, and according to the state of charge of the aged battery at each time point, the discharge curve offset correction result is obtained, including: Based on the parameter SOC0, according to the state of charge of the aged battery at each time point Where SOC0 is the preset initial state of charge of the aged battery, ΔT k-1,k is the sampling interval at each time point, I is the discharge current of the aged battery, and C is the discharge curve offset correction result obtained from the aged battery capacity.

8. A method system for correcting the offset of a battery discharge curve, characterized in that, The system includes a module for acquiring the discharge curve relationship of a calibrated battery, a module for acquiring the offset voltage of an aged battery, a module for constructing a discharge curve offset correction model, and a module for acquiring the discharge curve offset correction result, wherein: The module for obtaining the discharge curve relationship of the calibration battery is used to obtain the discharge curve relationship of the calibration battery, wherein the discharge curve relationship of the calibration battery represents the relationship between the calibration discharge voltage, the calibration discharge current and the state of charge of the calibration battery; The module for obtaining the offset voltage of the aged battery is used to obtain the offset voltage of the aged battery based on the state of charge of the aged battery at each time. A discharge curve offset correction model module is constructed based on the discharge curve relationship of the calibrated battery and the offset voltage of the aged battery. The module for obtaining discharge curve offset correction results is used to obtain the parameters of the discharge curve offset correction model, and based on the parameters, obtain the discharge curve offset correction results according to the state of charge of the aged battery at each time.

9. An electronic device, characterized in that, The device includes a memory and a processor, a computer program stored in the memory and executable on the processor, wherein the processor, when executing the computer program, implements a method for offset correction of a battery discharge curve as described in any one of claims 1 to 7.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the program is executed by the processor, it implements a method for offset correction of the battery discharge curve as described in any one of claims 1 to 7.

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