Electric vehicle low temperature charging compensation time determination method, system, device and medium

Abstract

This invention discloses a method, system, device, and medium for determining the low-temperature charging compensation time of electric vehicles. The method includes: acquiring a first charging current pulse spectrum and a second charging current pulse spectrum, wherein the first charging current pulse spectrum is the pulse spectrum of the charging current at a first preset temperature, and the second charging current pulse spectrum is the pulse spectrum of the charging current at a second preset temperature, and the first preset temperature is lower than the second preset temperature; determining the current crossover point of the first and second charging current pulse spectra; determining the target state of charge based on the current crossover point; determining a first charging time and a second charging time based on the target state of charge; and determining the compensation time based on the first and second charging times. This invention solves the technical problem of being unable to estimate the charging time of a vehicle-level power battery under low-temperature conditions.

Description

Technical Field

[0001] This invention belongs to the field of power battery technology, and specifically relates to a method, system, device and medium for determining the low-temperature charging compensation time of electric vehicles. Background Technology

[0002] With increasing global attention to environmental and energy issues, pure electric vehicles (EVs), as an environmentally friendly and efficient mode of transportation, have gradually gained widespread attention and recognition. However, due to limitations in battery characteristics, charging EVs in low-temperature environments presents significant challenges, posing new obstacles to their practicality and reliability. In low-temperature environments, the battery's internal resistance increases, the charging rate slows down, and the charging time lengthens. Therefore, charging in low-temperature environments requires controlling the charging rate to protect the battery and extend its lifespan. Because of the increased charging time for power batteries in low-temperature environments, the duration of low-temperature charging at the vehicle level has become a crucial parameter for evaluating the low-temperature charging capability of pure electric vehicles.

[0003] In existing technologies, the estimation of charging time for pure electric vehicles is mainly based on normal temperature environments, and it is mostly an estimation of the remaining charging time. It cannot estimate the charging time of the whole vehicle-level power battery under low temperature conditions. Summary of the Invention

[0004] This invention provides a method, system, device, and medium for determining the low-temperature charging compensation time of electric vehicles, so as to at least solve the technical problem of being unable to estimate the charging time of the whole vehicle-level power battery under low-temperature conditions.

[0005] According to a first aspect of the present invention, a method for determining the low-temperature charging compensation time of an electric vehicle is provided, comprising: acquiring a first charging current pulse spectrum and a second charging current pulse spectrum, wherein the first charging current pulse spectrum is a pulse spectrum of the charging current at a first preset temperature, the second charging current pulse spectrum is a pulse spectrum of the charging current at a second preset temperature, and the first preset temperature is lower than the second preset temperature; determining the current crossover point of the first charging current pulse spectrum and the second charging current pulse spectrum; determining a target state of charge based on the current crossover point; determining a first charging time and a second charging time based on the target state of charge, wherein the first charging time is the time required for the power battery to charge to the target state of charge at the first preset temperature, and the second charging time is the time required for the power battery to charge to the target state of charge at the second preset temperature; and determining a compensation time based on the first charging time and the second charging time.

[0006] Optionally, determining the target state of charge based on the current crossover point includes: determining the crossover time point in the second charging current pulse spectrum based on the current crossover point; and determining the state of charge corresponding to the crossover time point as the target state of charge.

[0007] Optionally, determining the first charging time and the second charging time based on the target state of charge includes: determining the first charging time based on the target state of charge, using a first charging current pulse spectrum and a preset calculation model; and determining the second charging time based on the target state of charge, using a second charging current pulse spectrum and a preset calculation model.

[0008] Optionally, the preset calculation model includes a first calculation formula, a second calculation formula, a third calculation formula, and a fourth calculation formula; determining the first charging time based on the target state of charge, using the first charging current pulse spectrum and the preset calculation model, includes: determining multiple first charging currents based on the first charging current pulse spectrum and the target state of charge, wherein the current values ​​of the multiple first charging currents are different; determining multiple first charging voltages based on the first charging current pulse spectrum and the multiple first charging currents, wherein the voltage values ​​of the multiple first charging voltages are different, and the multiple first charging voltages correspond one-to-one with the multiple first charging currents; and determining multiple first charging powers based on the multiple first charging currents, the multiple first charging voltages, and the first calculation formula, wherein... Multiple first charging powers correspond one-to-one with multiple first charging currents; based on the pulse spectrum of the first charging current, multiple first state-of-charge changes are determined, wherein each of the multiple state-of-charge changes corresponds one-to-one with the multiple first charging currents; based on the multiple first state-of-charge changes, the second calculation formula, and the preset rated capacity of the power battery, multiple first charged quantities are determined, wherein each of the multiple first state-of-charge changes corresponds one-to-one with the multiple first charged quantities; based on the multiple first charging powers and the multiple first charged quantities, multiple first sub-charging times are determined using the third calculation formula, wherein each of the multiple first charging powers corresponds one-to-one with the multiple first sub-charging times; based on the multiple first sub-charging times and the fourth calculation formula, the first charging time is determined.

[0009] Optionally, determining the second charging time based on the target state of charge, using the second charging current pulse spectrum and a preset calculation model, includes: determining multiple second charging currents based on the second charging current pulse spectrum and the target state of charge, wherein the current values ​​of the multiple second charging currents are different; determining multiple second charging voltages based on the second charging current pulse spectrum and the multiple second charging currents, wherein the voltage values ​​of the multiple second charging voltages are different, and the multiple second charging voltages correspond one-to-one with the multiple second charging currents; and determining multiple second charging powers based on the multiple second charging currents, the multiple second charging voltages, and a first calculation formula, wherein the multiple second charging powers correspond one-to-one with the multiple second charging currents. One-to-one correspondence; based on the second charging current pulse spectrum, determine multiple second state-of-charge changes, wherein each of the multiple state-of-charge changes corresponds one-to-one with a multiple second charging current; based on the multiple second state-of-charge changes, the second calculation formula, and the preset rated capacity of the power battery, determine multiple second charging capacities, wherein each of the multiple second state-of-charge changes corresponds one-to-one with a multiple second charging capacities; based on the multiple second charging powers and the multiple second charging capacities, use the third calculation formula to determine multiple second sub-charging times, wherein each of the multiple second charging powers and the multiple second sub-charging times corresponds one-to-one; based on the multiple second sub-charging times and the fourth calculation formula, determine the second charging time.

[0010] Optionally, determining the compensation time based on the first charging time and the second charging time includes: determining the difference between the first charging time and the second charging time as the compensation time.

[0011] Optionally, the first preset temperature is -10 degrees Celsius, and the second preset temperature is 25 degrees Celsius.

[0012] According to a second aspect of the present invention, a system for determining the low-temperature charging compensation time of an electric vehicle is also provided, comprising: an acquisition module for acquiring a first charging current pulse spectrum and a second charging current pulse spectrum, wherein the first charging current pulse spectrum is a pulse spectrum of the charging current at a first preset temperature, the second charging current pulse spectrum is a pulse spectrum of the charging current at a second preset temperature, and the first preset temperature is lower than the second preset temperature; a first determination module for determining a current crossover point between the first charging current pulse spectrum and the second charging current pulse spectrum; a second determination module for determining a target state of charge based on the current crossover point; a third determination module for determining a first charging time and a second charging time based on the target state of charge, wherein the first charging time is the time required for the power battery to charge to the target state of charge at the first preset temperature, and the second charging time is the time required for the power battery to charge to the target state of charge at the second preset temperature; and a fourth determination module for determining a compensation time based on the first charging time and the second charging time.

[0013] Optionally, the second determining module is further configured to: determine the crossover time point in the second charging current pulse spectrum based on the current crossover point; and determine the state of charge corresponding to the crossover time point as the target state of charge.

[0014] Optionally, the third determining module is also used to: determine a first charging time based on the first charging current pulse spectrum and a preset calculation model according to the target state of charge; and determine a second charging time based on the second charging current pulse spectrum and a preset calculation model according to the target state of charge.

[0015] Optionally, the preset calculation model includes a first calculation formula, a second calculation formula, a third calculation formula, and a fourth calculation formula; the third determining module is further configured to: determine multiple first charging currents based on the first charging current pulse spectrum and the target state of charge, wherein the current values ​​of the multiple first charging currents are different; determine multiple first charging voltages based on the first charging current pulse spectrum and the multiple first charging currents, wherein the voltage values ​​of the multiple first charging voltages are different, and the multiple first charging voltages correspond one-to-one with the multiple first charging currents; and determine multiple first charging powers based on the multiple first charging currents, the multiple first charging voltages, and the first calculation formula, wherein the multiple first charging powers correspond one-to-one with the multiple first charging currents. The electrical currents are matched one-to-one; based on the first charging current pulse spectrum, multiple first state-of-charge changes are determined, wherein each of the multiple state-of-charge changes corresponds one-to-one with a multiple first charging current; based on the multiple first state-of-charge changes, the second calculation formula, and the preset rated capacity of the power battery, multiple first charged quantities are determined, wherein each of the multiple first state-of-charge changes corresponds one-to-one with a multiple first charged quantities; based on the multiple first charging powers and the multiple first charged quantities, multiple first sub-charging times are determined using the third calculation formula, wherein each of the multiple first charging powers and the multiple first sub-charging times corresponds one-to-one; based on the multiple first sub-charging times and the fourth calculation formula, the first charging time is determined.

[0016] Optionally, the third determining module is further configured to: determine multiple second charging currents based on the second charging current pulse spectrum and the target state of charge, wherein the current values ​​of the multiple second charging currents are different; determine multiple second charging voltages based on the second charging current pulse spectrum and the multiple second charging currents, wherein the voltage values ​​of the multiple second charging voltages are different, and the multiple second charging voltages correspond one-to-one with the multiple second charging currents; determine multiple second charging powers based on the multiple second charging currents, the multiple second charging voltages, and the first calculation formula, wherein the multiple second charging powers correspond one-to-one with the multiple second charging currents; and determine multiple second charging powers based on the second charging current pulse spectrum. The diagram shows the determination of multiple second state-of-charge (SOC) changes, each corresponding to a second charging current. Based on these SOC changes, a second calculation formula, and a preset rated battery capacity, multiple second charge input quantities are determined, again corresponding to the SOC changes. Based on the multiple second charging powers and the second charge input quantities, a third calculation formula is used to determine multiple second sub-charging times, again corresponding to the second charging powers. Finally, based on the multiple sub-charging times and a fourth calculation formula, a second charging time is determined.

[0017] Optionally, the fourth determining module is also used to: determine the difference between the first charging time and the second charging time as a compensation time.

[0018] According to a third aspect of the present invention, an electronic device is also provided, including a memory and a processor, wherein the memory stores a computer program and the processor is configured to run the computer program to perform the method for determining the low-temperature charging compensation time of an electric vehicle as described in any of the embodiments of the first aspect above.

[0019] According to a fourth aspect of the present invention, a non-volatile storage medium is also provided, wherein a computer program is stored in the non-volatile storage medium, and the computer program is configured to execute the method for determining the low-temperature charging compensation time of an electric vehicle as described in any embodiment of the first aspect when running on a computer or processor.

[0020] In this embodiment of the invention, a first charging current pulse spectrum and a second charging current pulse spectrum are obtained, wherein the first charging current pulse spectrum is the pulse spectrum of the charging current at a first preset temperature, and the second charging current pulse spectrum is the pulse spectrum of the charging current at a second preset temperature, and the first preset temperature is lower than the second preset temperature; the current crossover point of the first charging current pulse spectrum and the second charging current pulse spectrum is determined; based on the current crossover point, a target state of charge is determined; based on the target state of charge, a first charging time and a second charging time are determined, wherein the first charging time is the time required for the power battery to charge to the target state of charge at the first preset temperature, and the second charging time is the time required for the power battery to charge to the target state of charge at the second preset temperature; a compensation time is determined based on the first charging time and the second charging time. This application determines the charging time at two different temperatures—low temperature and normal temperature—by analyzing the charging current pulse spectrum at different temperatures. Then, based on the charging time at different temperatures, a compensation time is determined. This compensation time represents the difference between the charging time at low temperature and the charging time at normal temperature. Based on the known charging time of the power battery at normal temperature, this compensation time can be used to estimate the charging time of the vehicle-level power battery at low temperature, thereby solving the technical problem of not being able to estimate the charging time of the vehicle-level power battery at low temperature. Attached Figure Description

[0021] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, illustrate exemplary embodiments of the invention and, together with their description, serve to explain the invention and do not constitute an undue limitation thereof. In the drawings:

[0022] Figure 1 This is a flowchart of a method for determining the low-temperature charging compensation time of an electric vehicle according to one embodiment of the present invention;

[0023] Figure 2 This is a structural block diagram of a system for determining the low-temperature charging compensation time of an electric vehicle according to one embodiment of the present invention. Detailed Implementation

[0024] 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.

[0025] 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 terms can be used interchangeably where appropriate so that 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 a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0026] According to an embodiment of the present invention, an embodiment of a method for determining the low-temperature charging compensation time of an electric vehicle is provided. It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system containing at least a set of computer-executable instructions. Furthermore, although a logical order is shown in the flowchart, in some cases, the steps shown or described may be executed in a different order than that shown here.

[0027] This method embodiment can also be executed in an electronic device including a memory and a processor, a similar control device, or in the cloud. Taking an electronic device as an example, the electronic device may include one or more processors and a memory for storing data. Optionally, the electronic device may also include a communication device for communication functions and a display device. Those skilled in the art will understand that the above structural description is merely illustrative and does not limit the structure of the electronic device. For example, the electronic device may include more or fewer components than described above, or have a different configuration than described above.

[0028] A processor may include one or more processing units. For example, a processor may include a central processing unit (CPU), a graphics processing unit (GPU), a digital signal processing (DSP) chip, a microcontroller unit (MCU), a field-programmable gate array (FPGA), a neural network processing unit (NPU), a tensor processing unit (TPU), or an artificial intelligence (AI) processor. Different processing units may be independent components or integrated into one or more processors. In some instances, electronic devices may also include one or more processors.

[0029] The memory can be used to store computer programs, such as the computer program corresponding to the method for determining the low-temperature charging compensation time of electric vehicles in this embodiment of the invention. The processor implements the aforementioned method for determining the low-temperature charging compensation time of electric vehicles by running the computer program stored in the memory. The memory may include high-speed random access memory and non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some instances, the memory may further include memory remotely located relative to the processor, and these remote memories can be connected to electronic devices via a network. Examples of such networks include, but are not limited to, the Internet, corporate intranets, local area networks, mobile communication networks, and combinations thereof.

[0030] The communication device is used to receive or send data via a network. Specific examples of the network mentioned above may include a wireless network provided by the mobile terminal's communication provider. In one example, the communication device includes a network interface controller (NIC), which can connect to other network devices via a base station to communicate with the Internet. In another example, the communication device may be a radio frequency (RF) module, used for wireless communication with the Internet. In some embodiments of this solution, the communication device is used to connect to mobile devices such as mobile phones and tablets, enabling the mobile device to send commands to the electronic device.

[0031] The display device can be a touchscreen liquid crystal display (LCD) or a touch display (also referred to as a "touchscreen" or "touch display screen"). The LCD allows a user to interact with the user interface of the electronic device. In some embodiments, the electronic device has a graphical user interface (GUI), which allows the user to interact with the GUI by touching a touch-sensitive surface with fingers and / or gestures. Executable instructions for performing these human-computer interaction functions are configured / stored in one or more processor-executable computer program products or readable storage media.

[0032] Figure 1 This is a flowchart of a method for determining the low-temperature charging compensation time of an electric vehicle according to one embodiment of the present invention, as follows: Figure 1 As shown, the method includes the following steps:

[0033] Step S101: Obtain the first charging current pulse spectrum and the second charging current pulse spectrum.

[0034] The first charging current pulse spectrum is the pulse spectrum of the charging current at the first preset temperature, and the second charging current is the pulse spectrum of the charging current at the second preset temperature. The first preset temperature is lower than the second preset temperature.

[0035] It is understandable that the charging current pulse spectrum of the same power battery will be different at different temperatures during the charging process.

[0036] It should be noted that the first and second charging current pulse spectra were obtained under experimental conditions.

[0037] Step S102: Determine the current crossover point of the first charging current pulse spectrum and the second charging current pulse spectrum.

[0038] Specifically, the current crossover point indicates that the charging capacity of the power battery at the first preset temperature has reached the charging level of the power battery at the second preset temperature.

[0039] It should be noted that the current crossover point only indicates that the charging current is the same at the first preset temperature and the second preset temperature; the corresponding time points are not the same. At the first preset temperature, it takes longer to reach the same charging current as at the second preset temperature.

[0040] Step S103: Determine the target state of charge based on the current crossover point.

[0041] Specifically, after obtaining the current crossover point, the current corresponding to the current crossover point is found in the second charging current pulse spectrum, and then the state of charge of the power battery at the time node corresponding to the current is determined, and the state of charge is taken as the target state of charge.

[0042] Step S104: Determine the first charging time and the second charging time based on the target state of charge.

[0043] The first charging time is the time required for the power battery to be charged to the target state of charge at the first preset temperature, and the second charging time is the time required for the power battery to be charged to the target state of charge at the second preset temperature.

[0044] Specifically, after obtaining the target state of charge, the first charging time and the second charging time can be determined according to the preset calculation model.

[0045] Step S105: Determine the compensation time based on the first charging time and the second charging time.

[0046] For example, in some embodiments of the present invention, the compensation time is the difference between the first charging time and the second charging time.

[0047] In this embodiment of the invention, a first charging current pulse spectrum and a second charging current pulse spectrum are obtained, wherein the first charging current pulse spectrum is the pulse spectrum of the charging current at a first preset temperature, and the second charging current pulse spectrum is the pulse spectrum of the charging current at a second preset temperature, and the first preset temperature is lower than the second preset temperature; the current crossover point of the first charging current pulse spectrum and the second charging current pulse spectrum is determined; based on the current crossover point, a target state of charge is determined; based on the target state of charge, a first charging time and a second charging time are determined, wherein the first charging time is the time required for the power battery to charge to the target state of charge at the first preset temperature, and the second charging time is the time required for the power battery to charge to the target state of charge at the second preset temperature; a compensation time is determined based on the first charging time and the second charging time. This application determines the charging time at two different temperatures—low temperature and normal temperature—by analyzing the charging current pulse spectrum at different temperatures. Then, based on the charging time at different temperatures, a compensation time is determined. This compensation time represents the difference between the charging time at low temperature and the charging time at normal temperature. Based on the known charging time of the power battery at normal temperature, this compensation time can be used to estimate the charging time of the vehicle-level power battery at low temperature, thereby solving the technical problem of not being able to estimate the charging time of the vehicle-level power battery at low temperature.

[0048] Optionally, determining the target state of charge based on the current crossover point includes: determining the crossover time point in the second charging current pulse spectrum based on the current crossover point; and determining the state of charge corresponding to the crossover time point as the target state of charge.

[0049] It should be noted that the crossover time point represents the time node in the second charging current pulse spectrum corresponding to the current crossover point.

[0050] Optionally, in step S103, determining the first charging time and the second charging time based on the target state of charge may include the following steps:

[0051] Step S1031: Determine the first charging time based on the target state of charge, the first charging current pulse spectrum, and the preset calculation model.

[0052] Step S1032: Determine the second charging time based on the target state of charge, the second charging current pulse spectrum, and the preset calculation model.

[0053] Specifically, when determining the first charging time and the second charging time based on the target state of charge, it is necessary to determine the first charging time based on the first charging current pulse spectrum and the second charging time based on the second charging current pulse spectrum, respectively. Both the determination of the first charging time and the determination of the second charging time utilize preset calculation models.

[0054] Optionally, the preset calculation model includes a first calculation formula, a second calculation formula, a third calculation formula, and a fourth calculation formula; in step S1031, determining the first charging time based on the target state of charge, using the first charging current pulse spectrum and the preset calculation model, may include the following steps:

[0055] Step S1031a: Based on the first charging current pulse spectrum and the target state of charge, determine multiple first charging currents, wherein the current values ​​of the multiple first charging currents are different.

[0056] Specifically, in the first charging current pulse spectrum, there are multiple charging stages before the battery reaches the target state of charge. Each charging stage corresponds to a different first charging current. Therefore, based on the first charging current pulse spectrum and the target state of charge, multiple first charging currents can be determined, and their corresponding values ​​are different.

[0057] Step S1031b: Based on the first charging current pulse spectrum and multiple first charging currents, determine multiple first charging voltages, wherein the voltage values ​​of the multiple first charging voltages are different, and the multiple first charging voltages correspond one-to-one with the multiple first charging currents.

[0058] Specifically, in the first charging current pulse spectrum, each different first charging current corresponds to a first charging voltage.

[0059] Step S1031c: Determine multiple first charging powers based on multiple first charging currents, multiple first charging voltages, and a first calculation formula, wherein the multiple first charging powers correspond one-to-one with the multiple first charging currents.

[0060] Specifically, the first calculation formula is:

[0061] P i =I i ·U i / 1000

[0062] Where i = 1, ..., n, n represents the number of different stable charging current stages identified based on the first charging current pulse spectrum; P i I represents the first charging power corresponding to the i-th stage, in kilowatts; i U represents the first charging current corresponding to the i-th stage, in amperes; i This represents the first charging voltage corresponding to the i-th stage, in volts.

[0063] Step S1031d: Based on the first charging current pulse spectrum, determine multiple first state of charge changes, wherein each of the multiple state of charge changes corresponds one-to-one with a multiple first charging current.

[0064] Specifically, the state of charge changes in different first charging current stages, so each first charging current corresponds to a first state of charge change.

[0065] Step S1031e: Based on multiple first state of charge changes, a second calculation formula, and a preset rated power battery capacity, multiple first charging capacities are determined, wherein the multiple first state of charge changes correspond one-to-one with the multiple first charging capacities.

[0066] Specifically, the second calculation formula is:

[0067] q i =Q·ΔSOC

[0068] Where, q i ΔSOC represents the first charge input corresponding to the i-th stage, in kilowatt-hours; Q represents the preset rated battery capacity, in kilowatt-hours; ΔSOC represents the range of battery state of charge change corresponding to the i-th stage.

[0069] Step S1031f: Based on multiple first charging powers and multiple first charging quantities, multiple first sub-charging times are determined using a third calculation formula, wherein the multiple first charging powers and multiple first sub-charging times correspond one-to-one.

[0070] Specifically, the third calculation formula is:

[0071]

[0072] Among them, t iThis represents the first sub-charging time corresponding to the i-th stage, in hours.

[0073] Step S1031g: Determine the first charging time based on multiple first sub-charging times and the fourth calculation formula.

[0074] Specifically, the fourth calculation formula is an accumulation formula, which accumulates the first sub-charging time corresponding to the first stage to the i-th stage, and the result is the first charging time.

[0075] Optionally, determining the second charging time based on the second charging current pulse spectrum and a preset calculation model according to the target state of charge in step S1032 may include the following steps:

[0076] Step S1032a: Based on the second charging current pulse spectrum and the target state of charge, determine multiple second charging currents, wherein the current values ​​of the multiple second charging currents are different.

[0077] Step S1032b: Based on the second charging current pulse spectrum and multiple second charging currents, determine multiple second charging voltages, wherein the voltage values ​​of the multiple second charging voltages are different, and the multiple second charging voltages correspond one-to-one with the multiple second charging currents.

[0078] Step S1032c: Determine multiple second charging powers based on multiple second charging currents, multiple second charging voltages, and a first calculation formula, wherein each of the multiple second charging powers corresponds one-to-one with the multiple second charging currents.

[0079] Step S1032d: Based on the second charging current pulse spectrum, determine multiple second state of charge changes, wherein each of the multiple state of charge changes corresponds one-to-one with a multiple second charging current.

[0080] Step S1032e: Based on multiple second state-of-charge changes, a second calculation formula, and a preset rated power battery capacity, multiple second charging capacities are determined, wherein the multiple second state-of-charge changes correspond one-to-one with the multiple second charging capacities.

[0081] Step S1032f: Based on multiple second charging powers and multiple second charging quantities, multiple second sub-charging times are determined using a third calculation formula, wherein the multiple second charging powers and multiple second sub-charging times correspond one-to-one.

[0082] Step S1032g: Determine the second charging time based on multiple second sub-charging times and the fourth calculation formula.

[0083] Specifically, the details of determining the second charging time are the same as those in steps S1031a to S1031g. The calculation of the second charging time can be completed by adaptively adjusting the value of the parameters, which will not be elaborated on here.

[0084] Optionally, the first preset temperature is -10 degrees Celsius, and the second preset temperature is 25 degrees Celsius.

[0085] Understandably, the first preset temperature can also be a temperature lower than -10 degrees Celsius, and the second preset temperature can be any other value close to 25 degrees Celsius.

[0086] Through the above description of the embodiments, those skilled in the art can clearly understand that the methods according to the above embodiments can be implemented by means of software plus necessary general-purpose hardware platforms. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, can be embodied in the form of a software product. This computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) and includes several instructions to cause a terminal device (which may be a mobile phone, computer, server, or network device, etc.) to execute the methods described in the various embodiments of the present invention.

[0087] This embodiment also provides a system for determining the low-temperature charging compensation time of electric vehicles. This system is used to implement the above embodiments and preferred embodiments, and details already described will not be repeated. As used below, the term "module" refers to a combination of software and / or hardware that can perform a predetermined function. Although the apparatus described in the following embodiments is preferably implemented in software, hardware implementation, or a combination of software and hardware, is also possible and contemplated.

[0088] Figure 2 This is a structural block diagram of an electric vehicle low-temperature charging compensation time determination system 200 according to one embodiment of the present invention, as shown below. Figure 2 As shown, an example is an electric vehicle low-temperature charging compensation time determination system 200, which includes: an acquisition module 201 for acquiring a first charging current pulse spectrum and a second charging current pulse spectrum, wherein the first charging current pulse spectrum is the pulse spectrum of the charging current at a first preset temperature, and the second charging current pulse spectrum is the pulse spectrum of the charging current at a second preset temperature, and the first preset temperature is lower than the second preset temperature; a first determination module 202 for determining the current crossover point of the first charging current pulse spectrum and the second charging current pulse spectrum; a second determination module 203 for determining the target state of charge based on the current crossover point; a third determination module 204 for determining a first charging time and a second charging time based on the target state of charge, wherein the first charging time is the time required for the power battery to charge to the target state of charge at the first preset temperature, and the second charging time is the time required for the power battery to charge to the target state of charge at the second preset temperature; and a fourth determination module 205 for determining the compensation time based on the first charging time and the second charging time.

[0089] Optionally, the second determining module 203 is further configured to: determine the crossover time point in the second charging current pulse spectrum based on the current crossover point; and determine the state of charge corresponding to the crossover time point as the target state of charge.

[0090] Optionally, the third determining module 204 is further configured to: determine a first charging time based on the first charging current pulse spectrum and a preset calculation model according to the target state of charge; and determine a second charging time based on the second charging current pulse spectrum and a preset calculation model according to the target state of charge.

[0091] Optionally, the preset calculation model includes a first calculation formula, a second calculation formula, a third calculation formula, and a fourth calculation formula; the third determining module 204 is further configured to: determine multiple first charging currents based on the first charging current pulse spectrum and the target state of charge, wherein the current values ​​of the multiple first charging currents are different; determine multiple first charging voltages based on the first charging current pulse spectrum and the multiple first charging currents, wherein the voltage values ​​of the multiple first charging voltages are different, and the multiple first charging voltages correspond one-to-one with the multiple first charging currents; determine multiple first charging powers based on the multiple first charging currents, the multiple first charging voltages, and the first calculation formula, wherein the multiple first charging powers correspond one-to-one with the multiple first charging currents. Each charging current corresponds to a specific charge current. Based on the first charging current pulse spectrum, multiple first state-of-charge (SOC) changes are determined, each SOC change corresponding to a specific first charging current. Based on the multiple SOC changes, the second calculation formula, and the preset rated power battery capacity, multiple first charge inputs are determined, each SOC change corresponding to a specific first charge input. Based on the multiple first charging powers and the multiple first charge inputs, multiple first sub-charging times are determined using the third calculation formula, each first charging power corresponding to a specific first sub-charging time. Based on the multiple first sub-charging times and the fourth calculation formula, the first charging time is determined.

[0092] Optionally, the third determining module 204 is further configured to: determine multiple second charging currents based on the second charging current pulse spectrum and the target state of charge, wherein the current values ​​of the multiple second charging currents are different; determine multiple second charging voltages based on the second charging current pulse spectrum and the multiple second charging currents, wherein the voltage values ​​of the multiple second charging voltages are different, and the multiple second charging voltages correspond one-to-one with the multiple second charging currents; determine multiple second charging powers based on the multiple second charging currents, the multiple second charging voltages, and the first calculation formula, wherein the multiple second charging powers correspond one-to-one with the multiple second charging currents; and determine multiple second charging powers based on the second charging currents. The pulse spectrum is used to determine multiple second state-of-charge (SOC) changes, each corresponding to a second charging current. Based on these SOC changes, a second calculation formula, and a preset rated battery capacity, multiple second charge inputs are determined, again corresponding to the SOC changes. Based on the second charging power and the second charge inputs, a third calculation formula is used to determine multiple second sub-charging times, again corresponding to the second charging power. Finally, based on the sub-charging times and a fourth calculation formula, the second charging time is determined.

[0093] Optionally, the fourth determining module 205 is also used to: determine the difference between the first charging time and the second charging time as a compensation time.

[0094] Embodiments of the present invention also provide an electronic device, including a memory and a processor, wherein the memory stores a computer program and the processor is configured to run the computer program to execute the method for determining the low-temperature charging compensation time of an electric vehicle as described in any of the above embodiments.

[0095] Optionally, in this embodiment, the processor in the above-described electronic device may be configured to run a computer program to perform the following steps:

[0096] Step S101: Obtain the first charging current pulse spectrum and the second charging current pulse spectrum.

[0097] Step S102: Determine the current crossover point of the first charging current pulse spectrum and the second charging current pulse spectrum.

[0098] Step S103: Determine the target state of charge based on the current crossover point.

[0099] Step S104: Determine the first charging time and the second charging time based on the target state of charge.

[0100] Step S105: Determine the compensation time based on the first charging time and the second charging time.

[0101] Optionally, specific examples in this embodiment can refer to the examples described in the above embodiments and optional implementations, and will not be repeated here.

[0102] Embodiments of the present invention also provide a non-volatile storage medium storing a computer program, wherein the computer program is configured to execute the method for determining the low-temperature charging compensation time of electric vehicles as described in any of the above embodiments when running on a computer or processor.

[0103] Optionally, in this embodiment, the computer program described above may be configured to store a computer program for performing the following steps:

[0104] Step S101: Obtain the first charging current pulse spectrum and the second charging current pulse spectrum.

[0105] Step S102: Determine the current crossover point of the first charging current pulse spectrum and the second charging current pulse spectrum.

[0106] Step S103: Determine the target state of charge based on the current crossover point.

[0107] Step S104: Determine the first charging time and the second charging time based on the target state of charge.

[0108] Step S105: Determine the compensation time based on the first charging time and the second charging time.

[0109] Optionally, specific examples in this embodiment can refer to the examples described in the above embodiments and optional implementations, and will not be repeated here.

[0110] In the above embodiments of the present invention, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0111] In the embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. The device embodiments described above are merely illustrative; for example, the division of modules can be a logical functional division, and in actual implementation, there may be other division methods. For instance, multiple modules or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the displayed or discussed mutual couplings, direct couplings, or communication connections may be through interfaces, or indirect couplings or communication connections between modules, and may be electrical or other forms.

[0112] The modules described as separate components may or may not be physically separate. The components shown as modules may or may not be physical modules; that is, they may be located in one place or distributed across multiple modules. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs.

[0113] Furthermore, the functional modules in the various embodiments of the present invention can be integrated into one processing module, or each module can exist physically separately, or two or more modules can be integrated into one module. The integrated modules described above can be implemented in hardware or as software functional modules.

[0114] If the integrated module is implemented as a software functional module and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, read-only memory (ROM), random access memory (RAM), portable hard drives, magnetic disks, or optical disks.

[0115] The above description is only a preferred embodiment of the present invention. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present invention, and these improvements and modifications should also be considered within the scope of protection of the present invention.

Claims

1. A method for determining the low-temperature charging compensation time of an electric vehicle, characterized in that, include: Obtain a first charging current pulse spectrum and a second charging current pulse spectrum, wherein the first charging current pulse spectrum is a pulse spectrum of the charging current at a first preset temperature, and the second charging current pulse spectrum is a pulse spectrum of the charging current at a second preset temperature, wherein the first preset temperature is lower than the second preset temperature; Determine the current crossover point between the first charging current pulse spectrum and the second charging current pulse spectrum, wherein the current crossover point indicates that the charging current is the same at the first preset temperature and at the second preset temperature, but the corresponding time points are not the same; Determine the current corresponding to the current crossover point in the second charging current pulse spectrum, and then determine the time node corresponding to the current crossover point as the crossover time point; The state of charge corresponding to the crossover time point is determined as the target state of charge. Based on the first charging current pulse spectrum and the target state of charge, a plurality of first charging currents are determined, wherein the number of first charging currents is the number of different stable charging current stages identified from the first charging current pulse spectrum before the power battery's state of charge reaches the target state of charge, and the current values ​​of the plurality of first charging currents are different; based on the first charging current pulse spectrum and the plurality of first charging currents, a plurality of first charging voltages are determined, wherein the voltage values ​​of the plurality of first charging voltages are different, and the plurality of first charging voltages correspond one-to-one with the plurality of first charging currents; based on the plurality of first charging currents, the plurality of first charging voltages, and a first calculation formula, a plurality of first charging powers are determined, wherein the plurality of first charging powers correspond one-to-one with the plurality of first charging currents; based on the... A first charging current pulse spectrum is used to determine multiple first state-of-charge (SOC) changes, each corresponding to a first charging current. Based on these SOC changes, a second calculation formula, and a preset rated battery capacity, multiple first charge inputs are determined, each corresponding to a first charge input. Based on the multiple first charging powers and the multiple first charge inputs, a third calculation formula is used to determine multiple first sub-charging times, each corresponding to a first sub-charging time. Based on the multiple first sub-charging times and a fourth calculation formula, a first charging time is determined, where the first charging time is the time required for the battery to charge to the target SOC at a first preset temperature. Based on the target state of charge, a second charging time is determined, wherein the second charging time is the time required for the power battery to be charged to the target state of charge at a second preset temperature; The compensation time is determined based on the first charging time and the second charging time.

2. The method for determining the low-temperature charging compensation time for electric vehicles according to claim 1, characterized in that, Determining the first charging time and the second charging time based on the target state of charge includes: The second charging time is determined based on the target state of charge, the second charging current pulse spectrum, and a preset calculation model.

3. The method for determining the low-temperature charging compensation time for electric vehicles according to claim 2, characterized in that, The step of determining the second charging time based on the target state of charge, the second charging current pulse spectrum, and the preset calculation model includes: Based on the second charging current pulse spectrum and the target state of charge, a plurality of second charging currents are determined, wherein the current values ​​of the plurality of second charging currents are different; Based on the second charging current pulse spectrum and the plurality of second charging currents, a plurality of second charging voltages are determined, wherein the voltage values ​​of the plurality of second charging voltages are different, and the plurality of second charging voltages correspond one-to-one with the plurality of second charging currents; Based on the plurality of second charging currents, the plurality of second charging voltages, and the first calculation formula, a plurality of second charging powers are determined, wherein the plurality of second charging powers correspond one-to-one with the plurality of second charging currents; Based on the second charging current pulse spectrum, a plurality of second state of charge changes are determined, wherein the plurality of state of charge changes correspond one-to-one with the plurality of second charging currents; Based on the plurality of second state-of-charge changes, the second calculation formula, and the preset rated power battery capacity, a plurality of second charging capacities are determined, wherein the plurality of second state-of-charge changes correspond one-to-one with the plurality of second charging capacities; Based on the plurality of second charging powers and the plurality of second charging quantities, a plurality of second sub-charging times are determined using a third calculation formula, wherein the plurality of second charging powers and the plurality of second sub-charging times correspond one-to-one; The second charging time is determined based on the plurality of second sub-charging times and the fourth calculation formula.

4. The method for determining the low-temperature charging compensation time for electric vehicles according to claim 1, characterized in that, The step of determining the compensation time based on the first charging time and the second charging time includes: The difference between the first charging time and the second charging time is determined as the compensation time.

5. The method for determining the low-temperature charging compensation time for electric vehicles according to claim 1, characterized in that, The first preset temperature is -10 degrees Celsius, and the second preset temperature is 25 degrees Celsius.

6. A system for determining the low-temperature charging compensation time of electric vehicles, characterized in that, include: The acquisition module is used to acquire a first charging current pulse spectrum and a second charging current pulse spectrum, wherein the first charging current pulse spectrum is a pulse spectrum of the charging current at a first preset temperature, and the second charging current pulse spectrum is a pulse spectrum of the charging current at a second preset temperature, wherein the first preset temperature is lower than the second preset temperature. The first determining module is used to determine the current crossover point of the first charging current pulse spectrum and the second charging current pulse spectrum, wherein the current crossover point indicates that the charging current is the same at the first preset temperature and at the second preset temperature, but the corresponding time points are not the same. The second determining module is used to determine the current corresponding to the current crossover point in the second charging current pulse spectrum, and then determine the time node corresponding to the current crossover point as the crossover time point; and determine the state of charge corresponding to the crossover time point as the target state of charge. The third determining module is configured to: determine multiple first charging currents based on the first charging current pulse spectrum and the target state of charge, wherein the number of first charging currents is the number of different stable charging current stages identified from the first charging current pulse spectrum before the power battery's state of charge reaches the target state of charge, and the current values ​​of the multiple first charging currents are different; determine multiple first charging voltages based on the first charging current pulse spectrum and the multiple first charging currents, wherein the voltage values ​​of the multiple first charging voltages are different, and the multiple first charging voltages correspond one-to-one with the multiple first charging currents; and determine multiple first charging powers based on the multiple first charging currents, the multiple first charging voltages, and a first calculation formula, wherein the multiple first charging powers correspond one-to-one with the multiple first charging currents. Based on the first charging current pulse spectrum, multiple first state-of-charge (SOC) changes are determined, wherein each SOC change corresponds one-to-one with the multiple first charging currents; based on the multiple first SOC changes, a second calculation formula, and a preset rated power battery capacity, multiple first charge inputs are determined, wherein each first SOC change corresponds one-to-one with the multiple first charge inputs; based on the multiple first charging powers and the multiple first charge inputs, multiple first sub-charging times are determined using a third calculation formula, wherein each first charging power corresponds one-to-one with the multiple first sub-charging times; based on the multiple first sub-charging times and a fourth calculation formula, a first charging time is determined, wherein the first charging time is the time required for the power battery to charge to the target SOC at a first preset temperature; The second determining module is further configured to determine a second charging time based on the target state of charge, wherein the second charging time is the time required for the power battery to be charged to the target state of charge at a second preset temperature; The fourth determining module is used to determine the compensation time based on the first charging time and the second charging time.

7. An electronic device comprising a memory and a processor, characterized in that, The memory stores a computer program, and the processor is configured to run the computer program to perform the method for determining the low-temperature charging compensation time of an electric vehicle as described in any one of claims 1 to 5.

8. A non-volatile storage medium, characterized in that, The non-volatile storage medium stores a computer program, wherein the computer program is configured to execute the method for determining the low-temperature charging compensation time of an electric vehicle as described in any one of claims 1 to 5 when running on a computer or processor.

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