Battery cycle aging estimation method and device, electronic equipment and storage medium

Abstract

The invention relates to a battery cycle aging estimation method and device, electronic equipment and a storage medium, and belongs to the technical field of battery management.The battery cycle aging estimation method comprises the steps that the battery cycle aging is estimated based on the capacity, the charging current, the discharging current, the discharging depth and the temperature of a target battery at the current moment; determining the cyclic aging rate of the target battery at the current moment; and determining the SOH of the target battery at the next moment based on the cyclic aging rate, the SOH and the target capacity attenuation value of the target battery at the current moment, the target capacity attenuation value being the capacity attenuation value of the target battery from the current moment to the next moment. According to the method, the influence of various factors is considered during battery cycle aging estimation, and the accuracy of battery cycle aging estimation is improved.

Description

Technical Field

[0001] The present invention relates to the field of battery management technology, and in particular to a method, device, electronic equipment and storage medium for estimating battery cycle aging. Background Art

[0002] Battery State of Health (SOH) is generally used to indicate the degree of battery aging. Usually, SOH estimation is based on the prediction model of calendar aging and cycle aging to predict calendar aging and cycle aging, and then predict the overall SOH value of the battery pack. Battery SOH estimation is a very important part of the battery management system, and cycle aging estimation is a very important part of SOH estimation.

[0003] A large number of studies have shown that cycle aging is not only affected by factors such as temperature, state of charge (SOC), depth of discharge, and current, but it is also difficult to completely separate the static time in battery cycle aging due to the limitations of the test itself, resulting in large errors in the estimation model of cycle aging.

[0004] Therefore, how to reduce the error in the battery cycle aging estimation process and improve the accuracy of battery cycle aging estimation has become a technical problem that needs to be solved urgently. Summary of the invention

[0005] In view of this, it is necessary to provide a battery cycle aging estimation method, device, electronic device and storage medium to solve the problem of insufficient estimation accuracy caused by errors in the existing battery cycle aging estimation process.

[0006] In order to solve the above problems, the present invention provides a method for estimating battery cycle aging, comprising: Determine the cycle aging rate of the target battery at the current moment based on the capacity, charging current, discharging current, discharge depth and temperature of the target battery at the current moment; The SOH of the target battery at the next moment is determined based on the cycle aging rate, SOH and target capacity decay value of the target battery at the current moment, where the target capacity decay value is the capacity decay value of the target battery from the current moment to the next moment.

[0007] In a possible implementation, determining the cycle aging rate of the target battery at the current moment based on the capacity, charging current, discharging current, discharge depth and temperature of the target battery at the current moment includes: Determine the cycle aging current coefficient of the target battery at the current moment based on the charging current and discharging current of the target battery at the current moment; Determine the cycle aging discharge depth coefficient of the target battery at the current moment based on the discharge depth of the target battery at the current moment; Determine the cycle aging temperature coefficient of the target battery at the current moment based on the temperature of the target battery at the current moment; The cycle aging rate of the target battery at the current moment is determined based on the cycle aging current coefficient, the cycle aging discharge depth coefficient, the cycle aging temperature coefficient and the capacity of the target battery at the current moment.

[0008] In a possible implementation, determining the cycle aging rate of the target battery at the current moment based on the cycle aging current coefficient, the cycle aging discharge depth coefficient, the cycle aging temperature coefficient, and the capacity of the target battery at the current moment includes: Determine the cycle aging correction value of the target battery at the current moment based on the cycle aging current coefficient, cycle aging discharge depth coefficient and cycle aging temperature coefficient of the target battery at the current moment, and the cycle aging initial value, wherein the cycle aging initial value is obtained after a cycle aging test is performed on a sample battery of the same model as the target battery when the charging current, the discharging current, the discharge depth and the temperature are all 0; Based on the cycle aging correction value, capacity and cycle aging coefficient of the target battery at the current moment, the cycle aging rate of the target battery at the current moment is determined.

[0009] In a possible implementation, determining the cycle aging correction value of the target battery at the current moment based on the cycle aging current coefficient, the cycle aging discharge depth coefficient, the cycle aging temperature coefficient, and the cycle aging initial value of the target battery at the current moment includes: The cycle aging correction value of the target battery at the current moment is determined based on the following formula:

[0010] in, Indicates the cycle aging correction value of the target battery at the current moment, Indicates the initial value of cycle aging, Indicates the cycle aging current coefficient of the target battery at the current moment, Indicates the cycle aging discharge depth coefficient of the target battery at the current moment, Indicates the cycle aging temperature coefficient of the target battery at the current moment.

[0011] In a possible implementation, determining the cycle aging rate of the target battery at the current moment based on the cycle aging correction value, capacity, and cycle aging coefficient of the target battery at the current moment includes: The cycle aging rate of the target battery at the current moment is determined based on the following formula:

[0012] in, Indicates the cycle aging rate of the target battery at the current moment, represents the cycle aging coefficient, Indicates the cycle aging correction value of the target battery at the current moment, Indicates the capacity of the target battery at the current moment.

[0013] In a possible implementation, the cycle aging current coefficient, cycle aging discharge depth coefficient, and cycle aging temperature coefficient of the target battery at the current moment are determined based on the following formulas:

[0014]

[0015]

[0016] in, Indicates the cycle aging current coefficient of the target battery at the current moment, Indicates the cycle aging discharge depth coefficient of the target battery at the current moment, Indicates the cycle aging temperature coefficient of the target battery at the current moment, represents the current constant, Indicates the charging current value of the target battery at the current moment. Indicates the discharge current value of the target battery at the current moment, represents the discharge depth constant, Indicates the state of charge at which the target battery starts discharging. Indicates the state of charge of the target battery at the end of discharge. represents the temperature constant, Indicates the current temperature of the target battery.

[0017] In a possible implementation, determining the SOH of the target battery at the next moment based on the cycle aging rate, SOH and target capacity decay value of the target battery at the current moment includes: The SOH of the target battery at the next moment is determined based on the following formula:

[0018] in, Indicates the SOH of the target battery at the next moment, Indicates the SOH of the target battery at the current moment, Indicates the cycle aging rate of the target battery at the current moment, represents the target capacity decay value, Indicates the current moment, Indicates the next moment.

[0019] The present invention also provides a battery cycle aging estimation device, comprising: A first determination module, configured to determine a cycle aging rate of a target battery at a current moment based on the capacity, charging current, discharging current, discharge depth and temperature of the target battery at a current moment; The second determination module is used to determine the SOH of the target battery at the next moment based on the cycle aging rate, SOH and target capacity decay value of the target battery at the current moment, where the target capacity decay value is the capacity decay value of the target battery from the current moment to the next moment.

[0020] The present invention also provides an electronic device, including a memory and a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the program, the battery cycle aging estimation method as described above is implemented.

[0021] The present invention also provides a computer-readable storage medium having a computer program stored thereon, and when the computer program is executed by a processor, the battery cycle aging estimation method as described above is implemented.

[0022] The beneficial effects of the present invention are as follows: the battery cycle aging estimation method, device, electronic device and storage medium provided by the present invention first determine the cycle aging rate of the target battery relative to the capacity change by combining a variety of factors that affect the cycle aging rate, thereby ensuring the accuracy of the cycle aging estimation, and then estimate the SOH of the target battery at the next moment by the cycle aging rate, SOH and target capacity decay value of the target battery at the current moment. During the estimation process, the SOH at the next moment needs to be estimated based on the SOH at the current moment, that is, the continuity of the SOH estimation is guaranteed, thereby further improving the accuracy of the battery cycle aging estimation. The present invention takes into account the influence of various factors when estimating the battery cycle aging, thereby improving the accuracy of the battery cycle aging estimation. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A schematic diagram of a flow chart of an embodiment of a method for estimating battery cycle aging provided by the present invention; Figure 2 A schematic diagram of a flow chart of an embodiment of a data analysis process provided by the present invention; Figure 3 A schematic diagram of a flow chart of an embodiment of a process for determining a cyclic aging rate provided by the present invention; Figure 4 A schematic diagram of a process flow of an embodiment of a cyclic aging four-dimensional table construction process provided by the present invention; Figure 5 A schematic diagram of the structure of an embodiment of a battery cycle aging estimation device provided by the present invention; Figure 6A schematic structural diagram of an electronic device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0024] The preferred embodiments of the present invention are described in detail below in conjunction with the accompanying drawings, wherein the accompanying drawings constitute a part of this application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not used to limit the scope of the present invention.

[0025] In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0026] In the description of the present invention, reference to an "embodiment" means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present invention. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive of other embodiments. It is explicitly and implicitly understood by those skilled in the art that the described embodiments may be combined with other embodiments.

[0027] Battery SOH is generally used to indicate the degree of battery aging. Usually, SOH estimation is based on the prediction model of calendar aging and cycle aging to predict calendar aging and cycle aging, and then predict the overall SOH value of the battery pack. Battery SOH estimation is a very important part of the battery management system, and cycle aging estimation is a very important part of SOH estimation.

[0028] A large number of studies have shown that cycle aging is not only affected by factors such as temperature, state of charge (SOC), depth of discharge, and current, but it is also difficult to completely separate the static time in battery cycle aging due to the limitations of the test itself, resulting in large errors in the estimation model of cycle aging.

[0029] In order to solve the above problems, the present invention provides a method for estimating battery cycle aging.

[0030] The specific embodiments are described in detail below: A specific embodiment of the present invention discloses a method for estimating battery cycle aging, combining Figure 1 Come and see, Figure 1 The flowchart of an embodiment of a method for estimating battery cycle aging provided by the present invention includes step S101 and step S102, wherein: In step S101, based on the capacity, charging current, discharging current, discharge depth and temperature of the target battery at the current moment, the cycle aging rate of the target battery at the current moment is determined; In step S102, the SOH of the target battery at the next moment is determined based on the cycle aging rate, SOH and target capacity decay value of the target battery at the current moment, where the target capacity decay value is the capacity decay value of the target battery from the current moment to the next moment.

[0031] During implementation, the capacity, charging current, discharging current, discharge depth and temperature of the target battery at the current moment can be obtained first. The capacity and temperature of the target battery can be obtained through the sensors set on the battery, and the charging current, discharging current and discharge depth of the target battery can be obtained according to the battery cycle plan. Then, the cycle aging rate of the target battery at the current moment can be further determined based on the capacity, charging current, discharging current, discharge depth and temperature of the target battery at the current moment. The cycle aging rate of the target battery at the current moment is the cycle aging rate relative to the battery capacity (i.e. Ah).

[0032] Then, the SOH of the target battery at the current moment and the capacity decay value of the target battery from the current moment to the next moment can be obtained. The capacity decay value of the target battery from the current moment to the next moment can be calculated according to the current battery cycle plan. Finally, according to the cycle aging rate, SOH and target capacity decay value of the target battery at the current moment, the SOH of the target battery at the next moment is determined to estimate the cycle aging of the target battery.

[0033] The battery cycle aging estimation method provided by the present invention can be applied to the cycle aging estimation of lithium batteries, and can also be applied to the cycle aging estimation of other types of batteries, and the present invention does not make specific limitations on this.

[0034] Compared with the prior art, the battery cycle aging estimation method provided in this embodiment first combines a variety of factors that affect the cycle aging rate to determine the cycle aging rate of the target battery relative to the capacity change, thereby ensuring the accuracy of the cycle aging estimation, and then estimates the SOH of the target battery at the next moment through the cycle aging rate, SOH and target capacity decay value of the target battery at the current moment. During the estimation process, it is necessary to estimate the SOH at the next moment based on the SOH at the current moment, that is, to ensure the continuity of the SOH estimation, thereby further improving the accuracy of the battery cycle aging estimation. The present invention takes into account the influence of various factors when estimating the battery cycle aging, thereby improving the accuracy of the battery cycle aging estimation.

[0035] Exemplarily, determining the cycle aging rate of the target battery at the current moment based on the capacity, charging current, discharging current, discharge depth and temperature of the target battery at the current moment includes: Determine the cycle aging current coefficient of the target battery at the current moment based on the charging current and discharging current of the target battery at the current moment; Determine the cycle aging discharge depth coefficient of the target battery at the current moment based on the discharge depth of the target battery at the current moment; Determine the cycle aging temperature coefficient of the target battery at the current moment based on the temperature of the target battery at the current moment; The cycle aging rate of the target battery at the current moment is determined based on the cycle aging current coefficient, the cycle aging discharge depth coefficient, the cycle aging temperature coefficient and the capacity of the target battery at the current moment.

[0036] Specifically, when determining the cycle aging rate of the target battery at the current moment according to the capacity, charging current, discharging current, discharge depth and temperature of the target battery at the current moment, the cycle aging current coefficient of the target battery at the current moment can be determined first according to the charging current and discharging current of the target battery at the current moment; and the cycle aging discharge depth coefficient of the target battery at the current moment can be determined according to the discharge depth of the target battery at the current moment; and at the same time, the cycle aging temperature coefficient of the target battery at the current moment can be determined according to the temperature of the target battery at the current moment.

[0037] Then, the cycle aging rate of the target battery at the current moment can be determined according to the cycle aging current coefficient, cycle aging discharge depth coefficient, cycle aging temperature coefficient and capacity of the target battery at the current moment.

[0038] Exemplarily, determining the cycle aging rate of the target battery at the current moment based on the cycle aging current coefficient, cycle aging discharge depth coefficient, cycle aging temperature coefficient and capacity of the target battery at the current moment includes: Determine the cycle aging correction value of the target battery at the current moment based on the cycle aging current coefficient, cycle aging discharge depth coefficient and cycle aging temperature coefficient of the target battery at the current moment, and the cycle aging initial value, wherein the cycle aging initial value is obtained after a cycle aging test is performed on a sample battery of the same model as the target battery when the charging current, the discharging current, the discharge depth and the temperature are all 0; Based on the cycle aging correction value, capacity and cycle aging coefficient of the target battery at the current moment, the cycle aging rate of the target battery at the current moment is determined.

[0039] Specifically, when determining the cycle aging rate of the target battery at the current moment based on the cycle aging current coefficient, cycle aging discharge depth coefficient, cycle aging temperature coefficient and capacity of the target battery at the current moment, the cycle aging initial value can be determined first. The cycle aging initial value can be obtained by performing a cycle aging test on a sample battery of the same model as the target battery when the charging current, discharge current, discharge depth and temperature are all 0.

[0040] Then, the cycle aging correction value of the target battery at the current moment is determined according to the cycle aging current coefficient, cycle aging discharge depth coefficient, cycle aging temperature coefficient, and cycle aging initial value of the target battery at the current moment. Finally, the cycle aging rate of the target battery at the current moment is determined according to the cycle aging correction value, capacity, and cycle aging coefficient of the target battery at the current moment. The cycle aging coefficient can be a preset coefficient (for example, it can be set to 0.0001).

[0041] Exemplarily, determining the cycle aging correction value of the target battery at the current moment based on the cycle aging current coefficient, the cycle aging discharge depth coefficient and the cycle aging temperature coefficient, and the cycle aging initial value of the target battery at the current moment includes: The cycle aging correction value of the target battery at the current moment is determined based on the following formula:

[0042] in, Indicates the cycle aging correction value of the target battery at the current moment, Indicates the initial value of cycle aging, Indicates the cycle aging current coefficient of the target battery at the current moment, Indicates the cycle aging discharge depth coefficient of the target battery at the current moment, Indicates the cycle aging temperature coefficient of the target battery at the current moment.

[0043] Specifically, the cycle aging correction value of the target battery at the current moment can be determined according to the above formula.

[0044] Exemplarily, determining the cycle aging rate of the target battery at the current moment based on the cycle aging correction value, capacity, and cycle aging coefficient of the target battery at the current moment includes: The cycle aging rate of the target battery at the current moment is determined based on the following formula:

[0045] in, Indicates the cycle aging rate of the target battery at the current moment, represents the cycle aging coefficient, Indicates the cycle aging correction value of the target battery at the current moment, Indicates the capacity of the target battery at the current moment.

[0046] Specifically, the cycle aging rate of the target battery at the current moment can be determined according to the above formula.

[0047] Exemplarily, the cycle aging current coefficient, cycle aging discharge depth coefficient, and cycle aging temperature coefficient of the target battery at the current moment are determined based on the following formulas:

[0048]

[0049]

[0050] in, Indicates the cycle aging current coefficient of the target battery at the current moment, Indicates the cycle aging discharge depth coefficient of the target battery at the current moment, Indicates the cycle aging temperature coefficient of the target battery at the current moment, represents the current constant, Indicates the charging current value of the target battery at the current moment. Indicates the discharge current value of the target battery at the current moment, represents the discharge depth constant, Indicates the state of charge at which the target battery starts discharging. Indicates the state of charge of the target battery at the end of discharge. represents the temperature constant, Indicates the current temperature of the target battery.

[0051] Specifically, the cycle aging current coefficient, cycle aging discharge depth coefficient and cycle aging temperature coefficient of the target battery at the current moment can be determined according to the above formula.

[0052] Exemplarily, the determining the SOH of the target battery at the next moment based on the cycle aging rate, SOH and target capacity decay value of the target battery at the current moment includes: The SOH of the target battery at the next moment is determined based on the following formula:

[0053] in, Indicates the SOH of the target battery at the next moment, Indicates the SOH of the target battery at the current moment, Indicates the cycle aging rate of the target battery at the current moment, represents the target capacity attenuation value, Indicates the current moment, Indicates the next moment.

[0054] Specifically, the SOH of the target battery at the next moment can be determined according to the above formula.

[0055] The following is a specific application scenario to better illustrate the technical solution of the present invention: First, you need to obtain test data and test the cycle aging of a 12V low-voltage lithium battery. Perform cycle charge and discharge tests on the battery pack at different temperatures. The temperatures are set to -25℃, -10℃, 0℃, 25℃, 40℃, and 60℃, and the charge and discharge currents are set to 11A, 20A, 22A, 33A, 45A, 66A, and 70A, respectively. For example, the cycle aging test at 60℃ is at 60℃ with an initial SOC of 95%. Discharge at 22A until the SOC reaches 81%, and then charge at 70A until the SOC reaches 95%. Cycle charge and discharge are performed in this way, and the total SOH value after 100, 200, 300...2000, and 8000 cycles, as well as the temperature, test time, and capacity of the battery pack during charge and discharge are recorded. In order to analyze the impact of different discharge depths on cycle aging, in another set of tests, the SOC can be set to an initial SOC of 95%, then stopped at 45%, and the charging cycle can be started, with the charging and discharging currents set to be consistent.

[0056] Through the above test method, the corresponding SOH values ​​at -25℃, -10℃, 0℃, 25℃, 40℃, 60℃, charge and discharge currents of 11A, 20A, 22A, 33A, 45A, 66A, 70A, discharge depths of 0.5 and 0.14, and cycle times of 100-8000 times can be obtained, as well as the corresponding time spent and the Ah value of charge and discharge.

[0057] Combination Figure 2 Come and see, Figure 2 The present invention provides a flow chart of an embodiment of the data analysis process. Through data analysis, it can be known that the relationship between ln (Calendar_SOH) and ln (t) is linear, and the relationship between ln (SOH) and ln (t) is also linear, that is, ln (Cycle_SOH) is also linear with ln (t), that is, the relationship between Cycle_SOH and time t is a curve that is fast at first and then slow.

[0058] Combination Figure 3 Come and see, Figure 3 This is a flow chart of an embodiment of the cycle aging rate determination process provided by the present invention. Through this process, the aging rate of pure cycle aging in each Ah can be calculated, and then the aging value of pure cycle aging at the corresponding Ah number can be calculated. The ampere-hour is used as the value for quantitative evaluation, and the reason for not using time is that it is difficult to completely distinguish the specific time of the pure cycle test in the test, while the ampere-hour data is accurate. The above calculation method can also be implemented by fitting.

[0059] Combination Figure 4 Come and see, Figure 4A flow chart of an embodiment of the process of constructing a four-dimensional table of cycle aging provided by the present invention is provided. A model is constructed according to the formula of battery cycle aging, and the cycle aging rate under corresponding test parameters is calculated and a four-dimensional table is constructed (i.e., the aging rate per ampere-hour of cycle aging under specific SOH, temperature, charge and discharge current, and discharge depth). The four-dimensional table is then corrected according to the test data to improve the accuracy of the estimation.

[0060] The estimation process of the present invention is simple and fast, and the predicted total SOH value can be used to predict the SOH value at the next moment, which can effectively improve the accuracy of battery cycle aging estimation.

[0061] The embodiment of the present invention also provides a battery cycle aging estimation device, combined with Figure 5 Come and see, Figure 5 This is a schematic diagram of the structure of an embodiment of a battery cycle aging estimation device provided by the present invention. The battery cycle aging estimation device 500 includes: A first determination module 501 is used to determine the cycle aging rate of the target battery at the current moment based on the capacity, charging current, discharging current, discharge depth and temperature of the target battery at the current moment; The second determination module 502 is used to determine the SOH of the target battery at the next moment based on the cycle aging rate, SOH and target capacity decay value of the target battery at the current moment, where the target capacity decay value is the capacity decay value of the target battery from the current moment to the next moment.

[0062] The specific implementation of each module of the battery cycle aging estimation device can refer to the description of the above-mentioned battery cycle aging estimation method, and has similar beneficial effects, which will not be repeated here.

[0063] It should be noted that the battery cycle aging estimation device can be provided in an existing battery monitoring device or as an independent device, and the present invention does not make any specific limitation to this.

[0064] The embodiment of the present invention further provides an electronic device, Figure 6 Come and see, Figure 6 This is a structural diagram of an embodiment of an electronic device provided by the present invention. The electronic device 600 includes a processor 601, a memory 602, and a computer program stored in the memory 602 and executable on the processor 601. When the processor 601 executes the program, the battery cycle aging estimation method as described above is implemented.

[0065] As a preferred embodiment, the electronic device 600 further includes a display 603 for displaying the battery cycle aging estimation method as described above executed by the processor 601 .

[0066] Exemplarily, the computer program may be divided into one or more modules / units, one or more modules / units are stored in the memory 602, and executed by the processor 601 to complete the present invention. One or more modules / units may be a series of computer program instruction segments that can complete specific functions, and the instruction segments are used to describe the execution process of the computer program in the electronic device 600. For example, the computer program may be divided into the first determination module 501 and the second determination module 502 in the above embodiment, and the specific functions of each module are as described above, and are not repeated here one by one.

[0067] The electronic device 600 may be a desktop computer, a notebook, a PDA or a smart phone with an adjustable camera module.

[0068] Among them, the processor 601 may be an integrated circuit chip with signal processing capabilities. The above-mentioned processor 601 may be a general-purpose processor, including a central processing unit (CPU), a network processor (NP), etc.; it may also be a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field-programmable gate array (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components. The disclosed methods, steps and logic block diagrams in the embodiments of the present invention can be implemented or executed. The general-purpose processor may be a microprocessor or the processor may also be any conventional processor, etc.

[0069] The memory 602 may be, but is not limited to, a random access memory (RAM), a read only memory (ROM), a programmable read-only memory (PROM), an erasable programmable read-only memory (EPROM), an electrically erasable read-only memory (EEPROM), etc. The memory 602 is used to store programs, and the processor 601 executes the program after receiving an execution instruction. The process definition method disclosed in any of the above embodiments of the present invention can be applied to the processor 601, or implemented by the processor 601.

[0070] The display 603 may be an LCD display screen or an LED display screen, for example, a display screen on a mobile phone.

[0071] Understandably, Figure 6 The structure shown is only a schematic diagram of a structure of the electronic device 600. The electronic device 600 may also include Figure 6 More or fewer components as shown. Figure 6 Each component shown in the figure can be implemented by hardware, software or a combination thereof.

[0072] The electronic device provided according to the above embodiment of the present invention can be implemented with reference to the specific description of the battery cycle aging estimation method as described above according to the present invention, and has similar beneficial effects as the battery cycle aging estimation method as described above, which will not be repeated here.

[0073] An embodiment of the present invention further provides a computer-readable storage medium on which a computer program is stored. When the program is executed by a processor, the battery cycle aging estimation method as described above is implemented.

[0074] Generally speaking, the computer instructions for implementing the method of the present invention can be carried by any combination of one or more computer-readable storage media. Non-transitory computer-readable storage media can include any computer-readable media except for the signal itself that is temporarily propagating.

[0075] Computer-readable storage media may be, for example, but not limited to, electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems, apparatuses, or devices, or any combination thereof. More specific examples of computer-readable storage media (a non-exhaustive list) include: an electrical connection having one or more conductors, a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), optical fiber, a portable compact disk read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination thereof. In this document, a computer-readable storage medium may be any tangible medium that contains or stores a program that may be used by or in conjunction with an instruction execution system, apparatus, or device.

[0076] Computer program codes for performing the operations of the present invention may be written in one or more programming languages ​​or a combination thereof, including object-oriented programming languages, such as Java, Smalltalk, C++, and conventional procedural programming languages, such as "C" or similar programming languages, in particular, Python suitable for neural network computing and platform frameworks based on TensorFlow, PyTorch, etc. may be used. The program code may be executed entirely on the user's computer, partially on the user's computer, as an independent software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer via any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (e.g., via the Internet using an Internet service provider).

[0077] Those skilled in the art will appreciate that all or part of the processes of the above-mentioned embodiments can be implemented by instructing related hardware through a computer program, and the program can be stored in a computer-readable storage medium, wherein the computer-readable storage medium is a disk, an optical disk, a read-only storage memory, or a random access memory, etc.

[0078] The present invention discloses a method, device, electronic device and storage medium for estimating battery cycle aging. Firstly, a plurality of factors influencing the cycle aging rate are combined to determine the cycle aging rate of a target battery relative to capacity change, thereby ensuring the accuracy of the cycle aging estimation. Then, the SOH of the target battery at the next moment is estimated by the cycle aging rate, SOH and target capacity attenuation value of the target battery at the current moment. During the estimation process, the SOH at the next moment needs to be estimated based on the SOH at the current moment, that is, the continuity of the SOH estimation is ensured, thereby further improving the accuracy of the battery cycle aging estimation. The present invention takes into account the influence of various factors when estimating the battery cycle aging, thereby improving the accuracy of the battery cycle aging estimation.

[0079] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A method for estimating battery cycle aging, characterized in that: include: Determine the cycle aging rate of the target battery at the current moment based on the capacity, charging current, discharging current, discharge depth and temperature of the target battery at the current moment; The SOH of the target battery at the next moment is determined based on the cycle aging rate, SOH and target capacity decay value of the target battery at the current moment, where the target capacity decay value is the capacity decay value of the target battery from the current moment to the next moment.

2. The method for estimating battery cycle aging according to claim 1, characterized in that: The determining of the cycle aging rate of the target battery at the current moment based on the capacity, charging current, discharging current, discharge depth and temperature of the target battery at the current moment includes: Determine the cycle aging current coefficient of the target battery at the current moment based on the charging current and discharging current of the target battery at the current moment; Determine the cycle aging discharge depth coefficient of the target battery at the current moment based on the discharge depth of the target battery at the current moment; Determine the cycle aging temperature coefficient of the target battery at the current moment based on the temperature of the target battery at the current moment; The cycle aging rate of the target battery at the current moment is determined based on the cycle aging current coefficient, the cycle aging discharge depth coefficient, the cycle aging temperature coefficient and the capacity of the target battery at the current moment.

3. The method for estimating battery cycle aging according to claim 2, characterized in that: The determining the cycle aging rate of the target battery at the current moment based on the cycle aging current coefficient, cycle aging discharge depth coefficient, cycle aging temperature coefficient and capacity of the target battery at the current moment includes: Determine the cycle aging correction value of the target battery at the current moment based on the cycle aging current coefficient, cycle aging discharge depth coefficient and cycle aging temperature coefficient of the target battery at the current moment, and the cycle aging initial value, wherein the cycle aging initial value is obtained after a cycle aging test is performed on a sample battery of the same model as the target battery when the charging current, the discharging current, the discharge depth and the temperature are all 0; Based on the cycle aging correction value, capacity and cycle aging coefficient of the target battery at the current moment, the cycle aging rate of the target battery at the current moment is determined.

4. The method for estimating battery cycle aging according to claim 3, characterized in that: The step of determining the cycle aging correction value of the target battery at the current moment based on the cycle aging current coefficient, the cycle aging discharge depth coefficient, the cycle aging temperature coefficient, and the cycle aging initial value of the target battery at the current moment includes: The cycle aging correction value of the target battery at the current moment is determined based on the following formula: in, Indicates the cycle aging correction value of the target battery at the current moment, Indicates the initial value of cycle aging, Indicates the cycle aging current coefficient of the target battery at the current moment, Indicates the cycle aging discharge depth coefficient of the target battery at the current moment, Indicates the cycle aging temperature coefficient of the target battery at the current moment.

5. The method for estimating battery cycle aging according to claim 3, characterized in that: The step of determining the cycle aging rate of the target battery at the current moment based on the cycle aging correction value, capacity and cycle aging coefficient of the target battery at the current moment includes: The cycle aging rate of the target battery at the current moment is determined based on the following formula: in, Indicates the cycle aging rate of the target battery at the current moment, represents the cycle aging coefficient, Indicates the cycle aging correction value of the target battery at the current moment, Indicates the capacity of the target battery at the current moment.

6. The method for estimating battery cycle aging according to claim 2, characterized in that: The cycle aging current coefficient, cycle aging discharge depth coefficient and cycle aging temperature coefficient of the target battery at the current moment are determined based on the following formulas: in, Indicates the cycle aging current coefficient of the target battery at the current moment, Indicates the cycle aging discharge depth coefficient of the target battery at the current moment, Indicates the cycle aging temperature coefficient of the target battery at the current moment, represents the current constant, Indicates the charging current value of the target battery at the current moment. Indicates the discharge current value of the target battery at the current moment, represents the discharge depth constant, Indicates the state of charge at which the target battery starts discharging. Indicates the state of charge of the target battery at the end of discharge. represents the temperature constant, Indicates the current temperature of the target battery.

7. The method for estimating battery cycle aging according to any one of claims 1 to 6, characterized in that: The determining the SOH of the target battery at the next moment based on the cycle aging rate, SOH and target capacity attenuation value of the target battery at the current moment includes: The SOH of the target battery at the next moment is determined based on the following formula: in, Indicates the SOH of the target battery at the next moment, Indicates the SOH of the target battery at the current moment, Indicates the cycle aging rate of the target battery at the current moment, represents the target capacity attenuation value, Indicates the current moment, Indicates the next moment.

8. A battery cycle aging estimation device, characterized in that: include: A first determination module, configured to determine a cycle aging rate of a target battery at a current moment based on the capacity, charging current, discharging current, discharge depth and temperature of the target battery at a current moment; The second determination module is used to determine the SOH of the target battery at the next moment based on the cycle aging rate, SOH and target capacity decay value of the target battery at the current moment, where the target capacity decay value is the capacity decay value of the target battery from the current moment to the next moment.

9. An electronic device, characterized in that: The invention comprises a memory and a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the program, the method for estimating battery cycle aging according to any one of claims 1 to 7 is implemented.

10. A computer-readable storage medium, characterized in that: A computer program is stored thereon, and when the computer program is executed by a processor, the method for estimating battery cycle aging according to any one of claims 1 to 7 is implemented.

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