Method and device for calculating charging time of power battery by alternating current, medium and electronic equipment

Abstract

The application discloses a power battery alternating current charging time calculation method and device, medium and electronic equipment, and belongs to the technical field of batteries. The power battery alternating current charging time calculation method comprises the following steps: acquiring an alternating current charging voltage change curve of a battery cell in a power battery; determining the charging power of the power battery according to the power of a high-voltage accessory and a low-voltage accessory assembly in a vehicle provided with the power battery; determining the relationship between the charging current and the charging time of the power battery according to the alternating current charging voltage change curve of the battery cell and the charging power; and determining the alternating current charging time of the power battery according to the target SOC change amount of the power battery and the relationship between the charging current and the charging time. The embodiment of the application can realize quantitative measurement of the alternating current charging time of the power battery in the whole available SOC range.

Description

Technical Field

[0001] This invention relates to the field of battery technology, and in particular to a method, apparatus, medium, and electronic device for calculating the AC charging time of a power battery. Background Technology

[0002] To address global warming and energy shortages, new energy vehicles are gradually replacing traditional gasoline-powered vehicles. Among them, pure electric vehicles, primarily powered by lithium-ion batteries, have become the mainstream in the automotive industry due to their advantages such as low pollution and high energy efficiency. However, due to the inherent limitations of lithium-ion batteries, the amount of electricity that can be charged for power and the time required to charge cannot be increased or decreased indefinitely, causing range anxiety and refueling anxiety for pure electric vehicle users, thus limiting the development of pure electric vehicles. The charging time of the power battery directly affects the user experience and convenience; therefore, charging time is a crucial indicator in charging management technology. However, existing charging time calculation methods typically rely on fitted curves obtained from numerous charging experiments to calculate the remaining charging time of the power battery. This makes it difficult to quantitatively calculate charging time in the early stages of development, when experimental data is lacking, and it also fails to adequately measure and analyze the charging time of the power battery across its entire usable state of charge (SOC). Summary of the Invention

[0003] This invention provides a method, apparatus, medium, and electronic device for calculating the AC charging time of a power battery, so as to achieve quantitative measurement of the AC charging time of a power battery throughout its usable SOC range.

[0004] In a first aspect, embodiments of the present invention provide a method for calculating the AC charging time of a power battery, including:

[0005] Obtain the AC charging voltage variation curve of the cells in the power battery;

[0006] The charging power of the power battery is determined based on the power of the high-voltage and low-voltage accessory assemblies in the vehicle in which the power battery is installed.

[0007] The relationship between the charging current and charging time of the power battery is determined based on the AC charging voltage variation curve of the battery cell and the charging power.

[0008] The AC charging time of the power battery is determined based on the target SOC change of the power battery and the relationship between the charging current and the charging time.

[0009] Optionally, the high-voltage accessory includes an AC charger and an energy conversion and distribution unit;

[0010] The step of determining the charging power of the power battery based on the power of the high-voltage and low-voltage accessory assemblies in the vehicle equipped with the power battery includes:

[0011] The charging power is obtained by subtracting the power consumption from the output power of the AC charger; wherein the power consumption is the sum of the power consumed by the energy conversion and distribution unit and the power consumed by the low-voltage accessory.

[0012] Optionally, determining the relationship between the charging current and time of the power battery based on the AC charging voltage variation curve of the battery cell and the charging power includes:

[0013] Based on the AC charging voltage variation curve of the battery cell and the series-parallel connection structure of each battery cell in the power battery, the relationship between the charging voltage and charging time of the power battery is determined.

[0014] Based on the relationship between the charging voltage and charging time of the power battery, and the charging power, the relationship between the charging current and time of the power battery is determined.

[0015] Optionally, determining the relationship between the charging current and time of the power battery based on the AC charging voltage variation curve of the battery cell and the charging power includes:

[0016] The AC charging voltage variation curve of the battery cell is fitted to obtain a first relationship characterizing the relationship between the charging voltage and the charging time of the battery cell;

[0017] A second relationship characterizing the relationship between the charging voltage and charging time of the power battery is determined based on the first relationship and the structural coefficient of the power battery; wherein, the structural coefficient is determined based on the series and parallel connection structure of each cell in the power battery;

[0018] A third relationship is determined based on the second relationship and the charging power to characterize the relationship between the charging current and the charging time of the power battery.

[0019] Optionally, the AC charging voltage variation curve of the battery cell is linearly fitted, and the first relationship is a first-order polynomial.

[0020] Optionally, the AC charging time of the power battery is determined based on the target SOC change of the power battery and the relationship between the charging current and the charging time, including:

[0021] The target charging capacity of the power battery is determined based on the target SOC change.

[0022] Integrate the third relation over time to obtain the target charging capacity. The lower limit of integration is 0, and the upper limit of integration is calculated as the AC charging time of the power battery.

[0023] Optionally, the target charging capacity is the product of the target SOC change and the rated capacity of the power battery.

[0024] Secondly, embodiments of the present invention also provide a power battery AC charging time calculation device, comprising:

[0025] The voltage curve acquisition module is used to acquire the AC charging voltage variation curve of the cells in the power battery.

[0026] A charging power determination module is used to determine the charging power of the power battery based on the power of the high-voltage accessory and low-voltage accessory assembly in the vehicle in which the power battery is installed.

[0027] The current-time relationship determination module is used to determine the relationship between the charging current and the charging time of the power battery based on the AC charging voltage change curve of the battery cell and the charging power.

[0028] The charging time calculation module is used to determine the AC charging time of the power battery based on the target SOC change of the power battery and the relationship between the charging current and the charging time.

[0029] Thirdly, embodiments of the present invention also provide an electronic device, comprising:

[0030] At least one processor; and a memory communicatively connected to said at least one processor;

[0031] The memory stores a computer program that can be executed by the at least one processor, and the computer program is executed by the at least one processor to enable the at least one processor to execute the power battery AC charging time calculation method provided in any embodiment of the present invention.

[0032] Fourthly, embodiments of the present invention also provide a computer-readable storage medium storing computer instructions, which are used to cause a processor to execute the power battery AC charging time calculation method provided in any embodiment of the present invention.

[0033] The AC charging time calculation method for power batteries provided in this invention requires obtaining the AC charging voltage change curve of the battery cell, as well as the power of the high-voltage and low-voltage accessories. It involves fewer device parameters, all of which can be obtained from device datasheets or empirical parameters, eliminating the need for fitting based on numerous charging test results. Therefore, it significantly reduces the number of charging tests, saves testing resources, improves work efficiency, and enables rapid charging time calculation. It is particularly suitable for quantitative calculation of charging time in the early stages of product development when experimental data is lacking. Furthermore, the target SOC change can be arbitrarily set according to actual needs, enhancing the flexibility and applicability of the calculation method to achieve quantitative measurement of the AC charging time of the power battery throughout its usable SOC range.

[0034] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0036] Figure 1 This is a flowchart illustrating a method for calculating the AC charging time of a power battery according to an embodiment of the present invention.

[0037] Figure 2 This is a schematic diagram of a process for obtaining the relationship between charging current and charging time according to an embodiment of the present invention;

[0038] Figure 3 This is a schematic diagram of the structure of a power battery AC charging time calculation device provided in an embodiment of the present invention;

[0039] Figure 4 This is a schematic diagram of the structure of an electronic device provided in an embodiment of the present invention. Detailed Implementation

[0040] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0041] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion.

[0042] This invention provides a method for calculating the AC charging time of a power battery. It is applicable to the early stages of automotive product development when few experimental parameters are available. Using rated or empirical parameters of various functional components in the vehicle, the method quantitatively analyzes the AC charging time of the power battery under any SOC variation, serving as a reference indicator for evaluating product positioning. This method can be executed by a power battery AC charging time calculation device, which can be implemented in hardware and / or software and can be configured in an electronic device. Figure 1 This is a flowchart illustrating a method for calculating the AC charging time of a power battery according to an embodiment of the present invention. Figure 1 As shown, the method includes:

[0043] S110. Obtain the AC charging voltage variation curve of the cells in the power battery.

[0044] A power battery is composed of multiple cells (or individual cells) connected in series and parallel. The AC charging voltage variation curve of a cell is a characteristic curve of the cell, used to reflect the charging and discharging characteristics of the cell, such as the relationship between the cell's charging voltage and charging time. This can be obtained by consulting existing materials such as the cell's datasheet. It can be assumed that the AC charging voltage variation curves of multiple cells in the same power battery are consistent.

[0045] S120. Determine the charging power of the power battery based on the power of the high-voltage and low-voltage accessory assemblies in the vehicle equipped with the power battery.

[0046] High-voltage accessories include, for example, AC chargers (such as on-board chargers, OBCs, or AC / DC rectifiers) and energy conversion and distribution units (such as DC / DC converters). Low-voltage accessories include, for example, low-voltage electrical loads such as ignition systems and lighting systems. The electrical energy supplied by the external AC charging station is converted to DC by the AC charger, and then stepped down by the energy conversion and distribution unit before being used to charge the power battery. A portion of the stepped-down electrical energy is also used to power the various low-voltage accessories.

[0047] Therefore, the charging power can be calculated by subtracting the power consumption from the output power of the AC charger; where the power consumption is the sum of the power consumed by the energy conversion and distribution unit and the power consumed by the low-voltage accessories. These power values ​​can be obtained, for example, by consulting the datasheet of each device model, or determined based on empirical parameters from previous applications of that device model.

[0048] S130. Determine the relationship between the charging current and charging time of the power battery based on the AC charging voltage variation curve and charging power of the battery cell.

[0049] For example, in this step, the relationship between the overall charging voltage and charging time of the power battery can be determined first based on the AC charging voltage variation curve of a single cell, and then the charging power can be divided by the relationship between the overall charging voltage and charging time of the power battery to obtain the relationship between the charging current and charging time of the power battery.

[0050] S140. Determine the AC charging time of the power battery based on the target SOC change of the power battery and the relationship between charging current and charging time.

[0051] The target SOC change can be arbitrarily set according to actual needs. This calculation method is applicable to the calculation of charging time under any SOC change, offering strong flexibility and applicability. Specifically, in this step, the capacity to be charged into the power battery can be determined based on the target SOC change; then, based on the capacity to be charged and the relationship between charging current and charging time, the AC charging time is determined.

[0052] In the early stages of product development, the corresponding AC charging time can be calculated by setting multiple target SOC changes. By setting multiple target SOC changes to cover the entire charging process as much as possible, the advancement of the charging time within the entire available SOC range of the power battery can be effectively measured, thereby better evaluating the user experience brought by pure electric vehicle products.

[0053] The AC charging time calculation method for power batteries provided in this invention requires obtaining the AC charging voltage change curve of the battery cell, as well as the power of the high-voltage and low-voltage accessories. It involves fewer device parameters, all of which can be obtained from device datasheets or empirical parameters, eliminating the need for fitting based on numerous charging test results. Therefore, it significantly reduces the number of charging tests, saves testing resources, improves work efficiency, and enables rapid charging time calculation. It is particularly suitable for quantitative calculation of charging time in the early stages of product development when experimental data is lacking. Furthermore, the target SOC change can be arbitrarily set according to actual needs, enhancing the flexibility and applicability of the calculation method to achieve quantitative measurement of the AC charging time of the power battery throughout its usable SOC range.

[0054] Based on the above embodiments, optionally, the AC charging time calculation method for power batteries can realize autonomous unsupervised calculation of AC charging time through simulation models or programs. Before the calculation, the AC charging voltage change curve of the battery cell and the power of the high-voltage and low-voltage accessories and other necessary parameters can be input. There is no need to measure or obtain the vehicle's operating parameters in real time, and the calculation process is simple and easy.

[0055] Based on the above-described embodiments, optionally, the method for calculating the AC charging time of a power battery can also be used to reverse-engineer the selection of equipment in a vehicle. Specifically, for pure electric vehicles, longer charging times may limit the flexibility and range of user travel, while shorter charging times can improve user satisfaction and promote the popularization and acceptance of pure electric vehicles. Current researchers are dedicated to improving charging speed to meet users' demands for fast and efficient charging. Therefore, a corresponding upper limit for the allowable charging time can be set for each target SOC change. This is equivalent to knowing the target SOC change and the AC charging time. Thus, the influencing factors of AC charging time can be identified based on this method, and the models and parameters of the battery cells, high-voltage accessories, or low-voltage accessories that can meet the charging time requirement can be reverse-engineered. For example, by changing at least one parameter among the battery cell charging voltage curve, battery capacity, battery arrangement, power of each high-voltage accessory, and power of each low-voltage accessory, the method can be used to calculate the AC charging time corresponding to the target SOC change. By comparing whether the calculated AC charging time is lower than the upper limit for the allowable charging time, it can be determined whether the parameters used in this calculation meet the design requirements. By repeating the above parameter adjustment and calculation process, a more reasonable selection of high and low voltage accessories can be made, thereby improving the charging effect.

[0056] Figure 2 This is a schematic flowchart illustrating the process of obtaining the relationship between charging current and charging time according to an embodiment of the present invention. (See also...) Figure 2 Based on the above embodiments, optionally, S130 specifically includes:

[0057] S21. Based on the AC charging voltage variation curve of the battery cell and the series and parallel connection structure of each battery cell in the power battery, determine the relationship between the charging voltage and charging time of the power battery.

[0058] Specifically, this step may include:

[0059] 1) Fit the AC charging voltage variation curve of the battery cell to obtain the first relationship that characterizes the relationship between the charging voltage and the charging time of the battery cell.

[0060] Curve fitting can be performed using any existing fitting method, as long as the formula relating the cell's charging voltage to its charging time can be obtained. For example, to simplify calculations, a linear fit can be applied to the AC charging voltage variation curve of the cell, making the first relationship a first-order polynomial. Specifically, the first relationship could be: U(t) = k*t + b, where U represents the cell's charging voltage; t represents the charging time (e.g., AC charging time), in hours; and k and b are coefficients obtained from the fitting.

[0061] 2) Determine the second relationship that characterizes the relationship between the charging voltage and the charging time of the power battery based on the first relationship and the structural coefficient of the power battery.

[0062] The structural coefficient is determined based on the series and parallel connection structure of the cells in the power battery. The second relationship can specifically be: U1(t) = n*U(t), where U1 represents the charging voltage of the power battery, and n is the structural coefficient, which can be, for example, the number of cells connected in series (i.e., the number of cells connected in series) in the power battery.

[0063] S22. Based on the relationship between the charging voltage and charging time of the power battery, and the charging power, determine the relationship between the charging current and time of the power battery.

[0064] Specifically, in this step, a third relationship characterizing the relationship between the charging current and charging time of the power battery can be determined based on the second relationship and the charging power. Specifically, the charging current can be obtained using the ratio of power to voltage. The third relationship is as follows: I(t)=(P OBC -P DCDC ) / (n*U(t)), where I represents the charging current of the power battery, P OBC This indicates the output power of the AC charger, in units such as W; P DCDC This indicates the power consumed, such as the power of the energy conversion and distribution unit and the low-voltage accessory assembly, in units such as W.

[0065] In this embodiment, the relationship between the charging current and time of the power battery was obtained through S21-S22, that is, the third relationship was obtained.

[0066] Optionally, based on the above embodiments, S140 may specifically include:

[0067] 1) Determine the target charging capacity of the power battery based on the target SOC change.

[0068] The target charging capacity can be the product of the target SOC change and the rated capacity of the power battery. The target SOC change can be, for example, the difference between the target upper limit SOC and the target lower limit SOC.

[0069] 2) Integrate the third relation over time. The result of the integration is the target charging capacity. The lower limit of the integration is 0. Calculate the upper limit of the integration as the AC charging time of the power battery.

[0070] The formula used in this step is as follows: Where C represents the target filling capacity, in units such as Ah.

[0071] The above AC charging calculation method can be implemented using a computer program. By solving the upper limit of the integral through a specific function, the AC charging time corresponding to the target charging capacity of the pure electric vehicle can be obtained.

[0072] In summary, this invention addresses the problem of limited experimental data and difficulty in estimating AC charging time during the early stages of product development by proposing a method for calculating the AC charging time of pure electric vehicles. The method primarily utilizes the AC charging voltage variation curve of a single battery cell and the charging power of the power battery to obtain the charging current. Employing the concept of ampere-hour integration, the calculated charging current is integrated over time, with the integration result representing the target charging capacity. Specifically, given the integration result, the integrand, and the lower limit of integration (which is 0), the upper limit of integration is calculated, thereby obtaining the AC charging time of the pure electric vehicle within a preset battery SOC range. This allows for the rapid calculation of charging time within a preset SOC range, providing an initial target for product development and serving as a reference indicator for product positioning. Furthermore, the calculation error is small, and the AC charging calculation can be implemented autonomously and unsupervised through simulation models or programs, making it highly applicable.

[0073] This invention also provides a power battery AC charging time calculation device, used to execute the power battery AC charging time calculation method provided in any embodiment of this invention, and has corresponding beneficial effects. Figure 3 This is a schematic diagram of the structure of a power battery AC charging time calculation device provided in an embodiment of the present invention. Figure 3 As shown, the device includes: a voltage curve acquisition module 310, a charging power determination module 320, a current-time relationship determination module 330, and a charging time calculation module 340.

[0074] The voltage curve acquisition module 310 is used to acquire the AC charging voltage variation curve of the cells in the power battery. The charging power determination module 320 is used to determine the charging power of the power battery based on the power of the high-voltage and low-voltage accessory assemblies in the vehicle equipped with the power battery. The current-time relationship determination module 330 is used to determine the relationship between the charging current and charging time of the power battery based on the AC charging voltage variation curve of the cells and the charging power. The charging time calculation module 340 is used to determine the AC charging time of the power battery based on the target SOC change of the power battery and the relationship between the charging current and the charging time.

[0075] Based on the above embodiments, optionally, the high-voltage accessory includes an AC charger and an energy conversion and distribution unit. Specifically, the charging power determination module 320 can use the output power of the AC charger minus the power consumed as the charging power; wherein the power consumed is the sum of the power consumed by the energy conversion and distribution unit and the power consumed by the low-voltage accessory.

[0076] Based on the above embodiments, optionally, the current-time relationship determination module 330 may include: a first determination unit and a second determination unit. The first determination unit is used to determine the relationship between the charging voltage and charging time of the power battery based on the AC charging voltage variation curve of the battery cell and the series-parallel connection structure of each battery cell in the power battery; specifically, it can be used to: fit the AC charging voltage variation curve of the battery cell to obtain a first relationship characterizing the relationship between the charging voltage and charging time of the battery cell; and determine a second relationship characterizing the relationship between the charging voltage and charging time of the power battery based on the first relationship and the structural coefficient of the power battery; wherein, the structural coefficient is determined based on the series-parallel connection structure of each battery cell in the power battery. The second determination unit is used to determine the relationship between the charging current and time of the power battery based on the relationship between the charging voltage and charging time of the power battery and the charging power; specifically, it can be used to determine a third relationship characterizing the relationship between the charging current and charging time of the power battery based on the second relationship and the charging power.

[0077] Based on the above embodiments, optionally, the first determining unit can perform linear fitting on the AC charging voltage change curve of the battery cell, so that the first relationship is expressed as a first-order polynomial.

[0078] Based on the above embodiments, optionally, the charging time calculation module 340 includes a first calculation unit and a second calculation unit. The first calculation unit is used to determine the target charging capacity of the power battery based on the target SOC change; specifically, the product of the target SOC change and the rated capacity of the power battery can be used as the target charging capacity. The second calculation unit is used to integrate the third relation over time, the integration result is the target charging capacity, the lower limit of integration is 0, and the upper limit of integration is calculated as the AC charging time of the power battery.

[0079] This invention also provides an electronic device, including: at least one processor; and a memory communicatively connected to the at least one processor. The memory stores a computer program executable by the at least one processor. The computer program is executed by the at least one processor to enable the at least one processor to execute the power battery AC charging time calculation method provided in any embodiment of this invention, thus achieving the corresponding beneficial effects. Figure 4 This is a schematic diagram of the structure of an electronic device provided in an embodiment of the present invention. See also... Figure 4Electronic device 10 is intended to represent various forms of digital computers, such as laptop computers, desktop computers, workstations, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. Electronic device 10 may also represent various forms of mobile devices, such as personal digital processors, cellular phones, smartphones, wearable devices (e.g., helmets, glasses, watches, etc.), and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely illustrative and are not intended to limit the implementation of the invention described and / or claimed herein.

[0080] like Figure 4 As shown, the electronic device 10 includes at least one processor 11 and a memory, such as a read-only memory (ROM) 12 or a random access memory (RAM) 13, communicatively connected to the at least one processor 11. The memory stores computer programs executable by the at least one processor. The processor 11 can perform various appropriate actions and processes based on the computer program stored in the ROM 12 or loaded from storage unit 18 into the RAM 13. The RAM 13 may also store various programs and data required for the operation of the electronic device 10. The processor 11, ROM 12, and RAM 13 are interconnected via a bus 14. An input / output (I / O) interface 15 is also connected to the bus 14.

[0081] Multiple components in electronic device 10 are connected to I / O interface 15, including: input unit 16, such as keyboard, mouse, etc.; output unit 17, such as various types of displays, speakers, etc.; storage unit 18, such as disk, optical disk, etc.; and communication unit 19, such as network card, modem, wireless transceiver, etc. Communication unit 19 allows electronic device 10 to exchange information / data with other devices through computer networks such as the Internet and / or various telecommunications networks.

[0082] Processor 11 can be a variety of general-purpose and / or special-purpose processing components with processing and computing capabilities. Some examples of processor 11 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various special-purpose artificial intelligence (AI) computing chips, various processors running machine learning model algorithms, a digital signal processor (DSP), and any suitable processor, controller, microcontroller, etc. Processor 11 performs the various methods and processes described above, such as the method for calculating the AC charging time of a power battery.

[0083] In some embodiments, the method for calculating the AC charging time of a power battery can be implemented as a computer program tangibly contained in a computer-readable storage medium, such as storage unit 18. In some embodiments, part or all of the computer program can be loaded and / or installed on the electronic device 10 via ROM 12 and / or communication unit 19. When the computer program is loaded into RAM 13 and executed by processor 11, one or more steps of the power battery AC charging time calculation method described above can be performed. Alternatively, in other embodiments, processor 11 can be configured to execute the power battery AC charging time calculation method by any other suitable means (e.g., by means of firmware).

[0084] Various embodiments of the systems and techniques described above herein can be implemented in digital electronic circuit systems, integrated circuit systems, field-programmable gate arrays (FPGAs), application-specific integrated circuits (ASICs), application-specific standard products (ASSPs), systems-on-a-chip (SoCs), payload-programmable logic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof. These various embodiments may include implementations in one or more computer programs that can be executed and / or interpreted on a programmable system including at least one programmable processor, which may be a dedicated or general-purpose programmable processor, capable of receiving data and instructions from a storage system, at least one input device, and at least one output device, and transmitting data and instructions to the storage system, the at least one input device, and the at least one output device.

[0085] Computer programs used to implement the methods of the present invention may be written in any combination of one or more programming languages. These computer programs may be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device, such that when executed by the processor, the computer programs cause the functions / operations specified in the flowcharts and / or block diagrams to be performed. The computer programs may be executed entirely on a machine, partially on a machine, or as a standalone software package, partially on a machine and partially on a remote machine, or entirely on a remote machine or server.

[0086] In the context of this invention, a computer-readable storage medium can be a tangible medium that may contain or store a computer program for use by or in conjunction with an instruction execution system, apparatus, or device. A computer-readable storage medium may include, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, apparatus, or devices, or any suitable combination thereof. Alternatively, a computer-readable storage medium may be a machine-readable signal medium. More specific examples of machine-readable storage media include electrical connections based on one or more wires, portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fibers, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof.

[0087] To provide interaction with a user, the systems and techniques described herein can be implemented on an electronic device having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to the user; and a keyboard and pointing device (e.g., a mouse or trackball) through which the user provides input to the electronic device. Other types of devices can also be used to provide interaction with the user; for example, feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user can be received in any form (including sound input, voice input, or tactile input).

[0088] The systems and technologies described herein can be implemented in computing systems that include backend components (e.g., as data servers), or computing systems that include middleware components (e.g., application servers), or computing systems that include frontend components (e.g., user computers with graphical user interfaces or web browsers through which users can interact with implementations of the systems and technologies described herein), or any combination of such backend, middleware, or frontend components. The components of the system can be interconnected via digital data communication of any form or medium (e.g., communication networks). Examples of communication networks include local area networks (LANs), wide area networks (WANs), blockchain networks, and the Internet.

[0089] A computing system can include clients and servers. Clients and servers are generally located far apart and typically interact through communication networks. The client-server relationship is created by computer programs running on the respective computers and having a client-server relationship with each other. The server can be a cloud server, also known as a cloud computing server or cloud host, which is a hosting product within the cloud computing service system to address the shortcomings of traditional physical hosts and VPS services, such as high management difficulty and weak business scalability.

[0090] It should be understood that the various forms of processes shown above can be used, with steps reordered, added, or deleted. For example, the steps described in this invention can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this invention can be achieved, and this is not limited herein.

[0091] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A method for calculating the AC charging time of a power battery, characterized in that, include: Obtain the AC charging voltage variation curve of the cells in the power battery; The charging power of the power battery is determined based on the power of the high-voltage and low-voltage accessory assemblies in the vehicle in which the power battery is installed. The relationship between the charging current and charging time of the power battery is determined based on the AC charging voltage variation curve of the battery cell and the charging power. The AC charging time of the power battery is determined based on the target SOC change of the power battery and the relationship between the charging current and the charging time. The relationship between the charging current and time of the power battery is determined based on the AC charging voltage variation curve of the battery cell and the charging power, including: The AC charging voltage variation curve of the battery cell is fitted to obtain a first relationship that characterizes the relationship between the charging voltage and the charging time of the battery cell. A second relationship characterizing the relationship between the charging voltage and charging time of the power battery is determined based on the first relationship and the structural coefficient of the power battery; wherein, the structural coefficient is determined based on the series and parallel connection structure of each cell in the power battery; A third relationship is determined based on the second relationship and the charging power to characterize the relationship between the charging current and the charging time of the power battery. Based on the target SOC change of the power battery and the relationship between the charging current and the charging time, the AC charging time of the power battery is determined, including: The target charging capacity of the power battery is determined based on the target SOC change. Integrate the third relation over time to obtain the target charging capacity. The lower limit of integration is 0, and the upper limit of integration is calculated as the AC charging time of the power battery.

2. The method for calculating the AC charging time of a power battery according to claim 1, characterized in that, The high-voltage accessory includes an AC charger and an energy conversion and distribution unit; The step of determining the charging power of the power battery based on the power of the high-voltage and low-voltage accessory assemblies in the vehicle equipped with the power battery includes: The charging power is obtained by subtracting the power consumption from the output power of the AC charger; wherein the power consumption is the sum of the power consumed by the energy conversion and distribution unit and the power consumed by the low-voltage accessory.

3. The method for calculating the AC charging time of a power battery according to claim 1, characterized in that, The AC charging voltage variation curve of the battery cell is linearly fitted, and the first relationship is a first-order polynomial.

4. The method for calculating the AC charging time of a power battery according to claim 1, characterized in that, The target charging capacity is the product of the target SOC change and the rated capacity of the power battery.

5. A power battery AC charging time calculation device, characterized in that, include: The voltage curve acquisition module is used to acquire the AC charging voltage variation curve of the cells in the power battery. A charging power determination module is used to determine the charging power of the power battery based on the power of the high-voltage accessory and low-voltage accessory assembly in the vehicle in which the power battery is installed. A current-time relationship determination module is used to determine the relationship between the charging current and charging time of the power battery based on the AC charging voltage variation curve of the battery cell and the charging power; determining the relationship between the charging current and time of the power battery based on the AC charging voltage variation curve of the battery cell and the charging power includes: fitting the AC charging voltage variation curve of the battery cell to obtain a first relationship characterizing the relationship between the charging voltage and charging time of the battery cell; determining a second relationship characterizing the relationship between the charging voltage and charging time of the power battery based on the first relationship and the structural coefficient of the power battery; wherein the structural coefficient is determined based on the series and parallel structure of each battery cell in the power battery; and determining a third relationship characterizing the relationship between the charging current and charging time of the power battery based on the second relationship and the charging power. The charging time calculation module is used to determine the AC charging time of the power battery based on the target SOC change of the power battery and the relationship between the charging current and the charging time. Determining the AC charging time of the power battery based on the target SOC change and the relationship between the charging current and the charging time includes: determining the target charging capacity of the power battery based on the target SOC change; integrating the third relationship over time, with the integration result being the target charging capacity, the lower limit of integration being 0, and calculating the upper limit of integration as the AC charging time of the power battery.

6. An electronic device, characterized in that, The electronic device includes: At least one processor; and a memory communicatively connected to said at least one processor; The memory stores a computer program that can be executed by the at least one processor, and the computer program is executed by the at least one processor to enable the at least one processor to execute the power battery AC charging time calculation method according to any one of claims 1-4.

7. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer instructions that are used to cause a processor to execute the method for calculating the AC charging time of a power battery as described in any one of claims 1-4.

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