Electric vehicle charging method, device, vehicle and storage medium

Abstract

The present application relates to the field of vehicle technology, and in particular to a charging method, device, vehicle and storage medium for electric vehicles, wherein the method comprises: detecting the current state of charge of the electric vehicle and the actual temperature of the environment in which it is located; when it is detected that the current state of charge is greater than a preset threshold value and the actual temperature is less than a preset temperature, calculating the current polarization voltage of the electric vehicle based on the current state of charge and the actual temperature; controlling the sum of the current static voltage and the current polarization voltage of the electric vehicle within the upper limit voltage range, generating a charging current matrix corresponding to the current state of charge and the actual temperature of the environment in which it is located, so as to charge the electric vehicle based on the charging current matrix. In this way, the problems of SOC jump and excessive attenuation of false mileage can be avoided, and heating can be performed while charging, without the need for charging after heating, thereby reducing the charging time and improving the user experience.

Description

Technical Field

[0001] The present application relates to the field of vehicle technology, and in particular to a charging method, device, vehicle and storage medium for an electric vehicle. Background Art

[0002] In cold areas, SOC (state of charge) jumps are prone to occur during low-temperature charging. The reason is that when charging at high SOC, due to the characteristics of the battery, a large polarization is generated at the beginning of low-temperature charging. As the charging progresses, the cell depolarizes and the temperature rises, which rapidly reduces the polarization and allows for continued charging. In general, in order to ensure the consistency of charge and discharge voltages, the battery system will be used in the available voltage window and will not be charged to the cell's limit charging window. Therefore, the cell can be charged at high SOC and low temperature, but the system has a SOC jump. The polarization voltage is too large at the beginning of low-temperature and high-SOC charging. At this time, the cell temperature rise is small, and the charging voltage easily reaches the upper limit voltage of the battery. At this time, the battery is not charged, but the battery SOC status shows 100%, and the SOC and mileage jump occur. At the same time, because the SOC state is artificially high, the user's mileage decays rapidly when driving, which affects the user's experience of using new energy vehicles and is not conducive to the development of new energy vehicles.

[0003] In the related art, the battery cells are generally heated to a certain temperature before charging. By heating the battery cells, polarization can be reduced, preventing direct charging to the voltage upper limit, thus eliminating SOC and mileage jumps.

[0004] However, this method is found to heat but not charge in the early stage of charging during fast charging or slow charging, resulting in no change in the SOC display, no increase in charging mileage, and increased charging time, resulting in a poor charging experience for users, which needs to be solved urgently.

[0005] Application Contents

[0006] The present application provides a charging method, device, vehicle and storage medium for an electric vehicle, which can avoid the problems of SOC jump and rapid attenuation of false mileage. At the same time, charging and heating can be performed simultaneously without heating before charging, thereby reducing charging time and improving user experience.

[0007] A first aspect of the present application provides a method for charging an electric vehicle, comprising the following steps:

[0008] Detect the current state of charge of the electric vehicle and the actual temperature of the environment;

[0009] When it is detected that the current state of charge is greater than a preset threshold and the actual temperature is less than a preset temperature, calculating a current polarization voltage of the electric vehicle based on the current state of charge and the actual temperature; and

[0010] The sum of the current static voltage of the electric vehicle and the current polarization voltage is controlled within an upper voltage range, and a charging current matrix corresponding to the current state of charge and the actual temperature of the environment is generated, so as to charge the electric vehicle based on the charging current matrix.

[0011] Optionally, controlling the sum of the current static voltage and the current polarization voltage of the electric vehicle within an upper voltage range and generating a charging current matrix corresponding to the current state of charge and the actual temperature of the environment includes:

[0012] If the sum of the current static voltage of the electric vehicle and the current polarization voltage is greater than the upper limit voltage, the charging current is reduced according to a preset reduction strategy and the current polarization voltage is recalculated; otherwise, the charging current matrix is ​​generated.

[0013] Optionally, the calculating the current polarization voltage of the electric vehicle based on the current state of charge and the actual temperature includes:

[0014] Calculate the current static voltage and current polarization internal resistance of the electric vehicle based on the current state of charge and the actual temperature;

[0015] The current polarization voltage is calculated based on the current polarization internal resistance and charging matrix current data.

[0016] Optionally, it also includes:

[0017] The charging current matrix is ​​input into the battery system of the electric vehicle for verification to determine whether the low temperature charging condition is met, and after the low temperature charging condition is met, the charging current matrix is ​​used to charge the electric vehicle. The second aspect of the present application provides a charging device for an electric vehicle, comprising:

[0018] A detection module, used to detect the current state of charge of the electric vehicle and the actual temperature of the environment in which it is located;

[0019] a calculation module, configured to calculate a current polarization voltage of the electric vehicle based on the current state of charge and the actual temperature when it is detected that the current state of charge is greater than a preset threshold and the actual temperature is less than a preset temperature; and

[0020] A charging module is used to control the sum of the current static voltage of the electric vehicle and the current polarization voltage within an upper limit voltage range, generate a charging current matrix corresponding to the current state of charge and the actual temperature of the environment, so as to charge the electric vehicle based on the charging current matrix.

[0021] Optionally, the charging module is specifically used to:

[0022] If the sum of the current static voltage of the electric vehicle and the current polarization voltage is greater than the upper limit voltage, the charging current is reduced according to a preset reduction strategy and the current polarization voltage is recalculated; otherwise, the charging current matrix is ​​generated.

[0023] Optionally, the calculation module is specifically used to:

[0024] Calculate the current static voltage and current polarization internal resistance of the electric vehicle based on the current state of charge and the actual temperature;

[0025] The current polarization voltage is calculated based on the current polarization internal resistance and charging matrix current data.

[0026] Optionally, it also includes:

[0027] A control module is used to input the charging current matrix into the battery system of the electric vehicle for verification, determine whether the low-temperature charging condition is met, and use the charging current matrix to charge the electric vehicle after the low-temperature charging condition is met.

[0028] A third aspect of the present application provides a vehicle, comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the electric vehicle charging method as described in the above embodiment.

[0029] A fourth aspect of the present application provides a computer-readable storage medium, wherein the computer-readable storage medium stores computer instructions, and the computer instructions are used to enable the computer to execute the electric vehicle charging method as described in the above embodiment.

[0030] Therefore, when it is detected that the current state of charge is greater than the preset threshold and the actual temperature is less than the preset temperature, the current polarization voltage of the electric vehicle can be calculated based on the current state of charge and the actual temperature, and the sum of the current static voltage and the current polarization voltage of the electric vehicle can be controlled within the upper limit voltage range, and a charging current matrix corresponding to the current state of charge and the actual temperature of the environment can be generated to charge the electric vehicle based on the charging current matrix. In this way, the problems of SOC jump and excessive attenuation of mileage can be avoided, and heating can be performed while charging, without heating and charging, thereby reducing charging time and improving user experience.

[0031] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0033] Figure 1 A flowchart of a charging method for an electric vehicle provided according to an embodiment of the present application;

[0034] Figure 2 is an exemplary diagram of a charging device for an electric vehicle according to an embodiment of the present application;

[0035] Figure 3 is a block diagram of an example of a charging device for an electric vehicle according to an embodiment of the present application;

[0036] Figure 4 1 is a block diagram of an electronic device according to an embodiment of the present application. DETAILED DESCRIPTION

[0037] Embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0038] The following describes the charging method, device, vehicle and storage medium of the electric vehicle of the embodiment of the present application with reference to the accompanying drawings. In response to the problems of SOC jump and false high mileage attenuation too fast mentioned in the above background technology center, the present application provides a charging method for an electric vehicle, in which when it is detected that the current state of charge is greater than a preset threshold and the actual temperature is less than a preset temperature, the current polarization voltage of the electric vehicle can be calculated based on the current state of charge and the actual temperature, and the sum of the current static voltage and the current polarization voltage of the electric vehicle is controlled within the upper limit voltage range, and a charging current matrix corresponding to the current state of charge and the actual temperature of the environment is generated, so as to charge the electric vehicle based on the charging current matrix. In this way, the problems of SOC jump and false high mileage attenuation too fast are avoided, and heating can be performed while charging, without the need for charging after heating, thereby reducing the charging time and improving the user experience.

[0039] Specifically, Figure 1 A schematic flow chart of a method for charging an electric vehicle provided in an embodiment of the present application.

[0040] like Figure 1 As shown, the charging method of the electric vehicle includes the following steps:

[0041] In step S101 , the current state of charge of the electric vehicle and the actual temperature of the surrounding environment are detected.

[0042] The state of charge is the percentage of the remaining capacity of the battery after discharge to the full charge capacity.

[0043] It should be understood that the embodiments of the present application can detect the current state of charge of the electric vehicle through the battery management system, and detect the actual temperature of the environment in which the electric vehicle is located through the temperature sensor. It should be noted that the above-mentioned methods of detecting the current state of charge of the electric vehicle and the actual temperature of the environment in which the electric vehicle is located are only exemplary and are not intended to limit the present invention. Those skilled in the art can select different detection methods according to actual conditions, and no specific limitation is made here.

[0044] In step S102 , when it is detected that the current state of charge is greater than a preset threshold and the actual temperature is less than a preset temperature, the current polarization voltage of the electric vehicle is calculated based on the current state of charge and the actual temperature.

[0045] Among them, the preset threshold can be a threshold set in advance by the user, a threshold obtained through a limited number of experiments, or a threshold obtained through a limited number of computer simulations; the preset temperature can be a temperature set in advance by the user, a temperature obtained through a limited number of experiments, or a temperature obtained through a limited number of computer simulations, and no specific limitation is made here.

[0046] For example, the preset threshold may be 80% and the preset temperature may be -10°C. If it is detected that the current state of charge is greater than 80% and the actual temperature is less than -10°C, the embodiment of the present application may calculate the current polarization voltage of the electric vehicle based on the current state of charge and the actual temperature.

[0047] As a possible implementation method, in some embodiments, the current polarization voltage of the electric vehicle is calculated based on the current state of charge and the actual temperature, including: calculating the current static voltage and the current polarization internal resistance of the electric vehicle based on the current state of charge and the actual temperature; calculating the current polarization voltage based on the current polarization internal resistance and the charging matrix current data.

[0048] Specifically, the current polarization internal resistance can be calculated by the following formula:

[0049] R = (V2-V1) / 3C;

[0050] Where V1 is the static voltage, V2 is the charging terminal voltage, and 3C is the current. The polarization voltage can be calculated using the following formula:

[0051] V = I * R;

[0052] Among them, R is the current polarization internal resistance, and I is the charging matrix current data.

[0053] In step S103, the sum of the current static voltage and the current polarization voltage of the electric vehicle is controlled within the upper voltage range, and a charging current matrix corresponding to the current state of charge and the actual temperature of the environment is generated to charge the electric vehicle based on the charging current matrix.

[0054] Optionally, in some embodiments, the sum of the current static voltage and the current polarization voltage of the electric vehicle is controlled within an upper limit voltage range, and a charging current matrix corresponding to the current state of charge and the actual temperature of the environment is generated, including: if the sum of the current static voltage and the current polarization voltage of the electric vehicle is greater than the upper limit voltage, the charging current is reduced according to a preset reduction strategy, and the current polarization voltage is recalculated, otherwise a charging current matrix is ​​generated.

[0055] Among them, the upper limit voltage can be a voltage pre-set by the user, a voltage obtained through a limited number of experiments, or a voltage obtained through a limited number of computer simulations, and no specific limitation is made here; the charging current matrix is ​​a matrix formed by the charging currents of battery cells at different temperatures and different SOC states, which is the boundary that the battery cells can be safely used.

[0056] Preferably, in some embodiments, the upper voltage limit may be 4.2V.

[0057] Specifically, if the sum of the current static voltage and the current polarization voltage of the electric vehicle is greater than the upper limit voltage, for example 4.2V, the embodiment of the present application can determine the charging current matrix of different temperatures and different SOCs by reducing the charging current of the current SOC and recalculating the current polarization voltage until the sum of the static voltage and the current polarization voltage does not exceed the upper limit voltage.

[0058] Optionally, in some embodiments, the method of the embodiments of the present application further includes: inputting the charging current matrix into the battery system of the electric vehicle for verification to determine whether the low-temperature charging conditions are met, and after the low-temperature charging conditions are met, using the charging current matrix to charge the electric vehicle.

[0059] That is to say, the embodiment of the present application can output the charging current matrix to the battery system of the electric vehicle for high SOC and low temperature charging verification, and use the charging current matrix to charge the electric vehicle after the verification is successful.

[0060] In order to enable those skilled in the art to further understand the charging method of the electric vehicle according to the embodiment of the present application, it is described in detail below in conjunction with specific embodiments.

[0061] like Figure 2 As shown, the charging method of the electric vehicle comprises the following steps:

[0062] S201, detecting the current state of charge of the electric vehicle and the actual temperature of the environment.

[0063] S202, when it is detected that the current state of charge is greater than a preset threshold and the actual temperature is less than a preset temperature, the current static voltage and the current polarization internal resistance of the electric vehicle are calculated based on the current state of charge and the actual temperature; the current polarization voltage is calculated based on the current polarization internal resistance and the charging matrix current data.

[0064] S203, determining whether the sum of the current static voltage and the current polarization voltage is greater than the upper limit voltage, if so, executing step S204, otherwise, executing step S205.

[0065] S204, reducing the charging current and jumping to step S202.

[0066] S205, generating a charging current matrix corresponding to the current state of charge and the actual temperature of the environment, and inputting the charging current matrix into the battery system of the electric vehicle for verification to determine whether the low-temperature charging conditions are met, and after the low-temperature charging conditions are met, using the charging current matrix to charge the electric vehicle.

[0067] The following is a detailed description of the charging method for an electric vehicle using a specific embodiment, which mainly includes the following steps:

[0068] (1) At room temperature of 25℃±2℃, perform standard charge and discharge on the battery cell three times, and record the average value Q of the three discharge capacities;

[0069] (2) At room temperature of 25°C ± 2°C, with Q as the total capacity of the cell, discharge at a current of 0.33C to 95% SOC;

[0070] (3) Adjust the test temperature to -10°C, place the battery cell at rest (the temperature difference between the battery and the environment is less than 2°C), and record the current static voltage V1;

[0071] (4) Charge the battery cell at 3C for 15S, record the terminal voltage V2, and calculate the current polarization internal resistance R (R = (V2-V1) / 3C);

[0072] (5) Repeat steps (2) to (4) to adjust the SOC state to 90%, 85%, and 80% respectively;

[0073] (6) Repeat (2) to (5) and adjust the temperature to -15°C, -20°C, and -25°C respectively, and calculate the current polarization internal resistance at different temperatures and different SOCs. The calculation results can be shown in Table 1.

[0074] (7) According to the current polarization internal resistance (R) of the battery cell at different SOCs and the charging matrix current data (I), the current polarization voltage (V=I*R) is calculated. The calculation results can be shown in Table 1.

[0075] Table 1

[0076]

[0077] (8) By calculating the sum of the static voltage and the current polarization voltage, the calculation result can be shown in Table 2, and the calculated voltage value exceeds the upper limit of the battery cell charging voltage of 4.2V.

[0078] Table 2

[0079]

[0080] It can be seen from Table 2 that when charging at high SOC and low temperature according to the cell fast charging matrix current, when charging in the SOC range of more than 90% at -25℃ and -20℃, the cell voltage exceeds 4.2V, resulting in failure to charge, and charging in the SOC range of more than 95% at -15℃ fails.

[0081] (9) If the upper limit voltage is exceeded, the charging current of the current SOC is reduced until the sum of the static voltage and the polarization voltage does not exceed the upper limit voltage, thereby determining the charging current matrix of different temperatures and different SOCs, as shown in Table 3. Table 3 shows that after calculating the upper limit voltage and polarization internal resistance of the battery cell, the charging current is reduced by high SOC to ensure that high SOC and low temperature charging will not exceed the charging upper limit voltage.

[0082] Table 3

[0083]

[0084] (10) At room temperature, perform standard charge and discharge on the battery system three times to activate the battery system; (11) Adjust the test temperature to -10°C, let the battery system stand for a long time (the temperature difference between the battery and the environment is less than 2°C), perform charge and discharge tests at the current temperature, and record the discharge capacity; (12) According to the system discharge capacity, adjust the SOC state to 95%, and let it stand for 6 hours at the current temperature;

[0085] (13) Charging according to the current determined in step (9) to verify whether the charging voltage exceeds the upper limit of the cell voltage, causing SOC jump;

[0086] (14) Repeat (12) to (13) and adjust the SOC state to 90%, 85%, and 80% respectively;

[0087] Repeat (11) to (14) and adjust the temperature to -15°C, -20°C, and -25°C respectively, and test whether the system charging voltage will exceed the upper limit voltage after the charging current is optimized. The test results can be shown in Table 4. Table 4 is the battery system test verification obtained after the high SOC and low temperature charging current of the battery cell is adjusted according to the current polarization internal resistance and static voltage.

[0088] Table 4

[0089]

[0090] According to the charging method of electric vehicles proposed in the embodiment of the present application, when it is detected that the current state of charge is greater than the preset threshold and the actual temperature is less than the preset temperature, the current polarization voltage of the electric vehicle can be calculated based on the current state of charge and the actual temperature, and the sum of the current static voltage and the current polarization voltage of the electric vehicle can be controlled within the upper limit voltage range, and a charging current matrix corresponding to the current state of charge and the actual temperature of the environment is generated, so as to charge the electric vehicle based on the charging current matrix. In this way, the problems of SOC jump and excessive attenuation of mileage can be avoided, and heating can be performed while charging, without heating and charging, thereby reducing charging time and improving user experience.

[0091] Next, the charging device for an electric vehicle according to an embodiment of the present application will be described with reference to the accompanying drawings.

[0092] Figure 3 It is a block diagram of a charging device for an electric vehicle according to an embodiment of the present application.

[0093] like Figure 3 As shown, the charging device 10 of the electric vehicle includes: a detection module 100 , a calculation module 200 and a charging module 300 .

[0094] The detection module 100 is used to detect the current state of charge of the electric vehicle and the actual temperature of the environment;

[0095] The calculation module 200 is used to calculate the current polarization voltage of the electric vehicle based on the current state of charge and the actual temperature when it is detected that the current state of charge is greater than a preset threshold and the actual temperature is less than a preset temperature; and

[0096] The charging module 300 is used to control the sum of the current static voltage and the current polarization voltage of the electric vehicle within the upper voltage range, generate a charging current matrix corresponding to the current state of charge and the actual temperature of the environment, and charge the electric vehicle based on the charging current matrix.

[0097] Optionally, in some embodiments, the charging module 300 is specifically used for:

[0098] If the sum of the current static voltage and the current polarization voltage of the electric vehicle is greater than the upper limit voltage, the charging current is reduced according to the preset reduction strategy and the current polarization voltage is recalculated, otherwise a charging current matrix is ​​generated.

[0099] Optionally, in some embodiments, the calculation module 200 is specifically used for:

[0100] Calculate the current static voltage and current polarization internal resistance of the electric vehicle based on the current state of charge and the actual temperature;

[0101] The current polarization voltage is calculated based on the current polarization internal resistance and charging matrix current data.

[0102] Optionally, in some embodiments, the above-mentioned electric vehicle charging device 10 further includes:

[0103] The control module is used to input the charging current matrix into the battery system of the electric vehicle for verification, determine whether the low-temperature charging conditions are met, and use the charging current matrix to charge the electric vehicle after the low-temperature charging conditions are met.

[0104] It should be noted that the above explanation of the embodiment of the charging method for an electric vehicle is also applicable to the charging device for an electric vehicle in this embodiment, and will not be repeated here.

[0105] According to the charging device of the electric vehicle proposed in the embodiment of the present application, when it is detected that the current state of charge is greater than the preset threshold value and the actual temperature is less than the preset temperature, the current polarization voltage of the electric vehicle can be calculated based on the current state of charge and the actual temperature, and the sum of the current static voltage and the current polarization voltage of the electric vehicle can be controlled within the upper limit voltage range, and a charging current matrix corresponding to the current state of charge and the actual temperature of the environment is generated, so as to charge the electric vehicle based on the charging current matrix. In this way, the problems of SOC jump and excessive attenuation of mileage can be avoided, and heating can be performed while charging, without heating and charging, thereby reducing the charging time and improving the user experience.

[0106] Figure 4 A schematic diagram of the structure of a vehicle provided in an embodiment of the present application. The vehicle may include:

[0107] Memory 401 , processor 402 , and a computer program stored in the memory 401 and executable on the processor 402 .

[0108] When the processor 402 executes the program, the electric vehicle charging method provided in the above embodiment is implemented.

[0109] Furthermore, the vehicle also includes:

[0110] The communication interface 403 is used for communication between the memory 401 and the processor 402 .

[0111] The memory 401 is used to store computer programs that can be executed on the processor 402 .

[0112] The memory 401 may include a high-speed RAM memory, and may also include a non-volatile memory (non-volatile memory), such as at least one disk memory.

[0113] If the memory 401, the processor 402 and the communication interface 403 are implemented independently, the communication interface 403, the memory 401 and the processor 402 can be connected to each other through a bus and communicate with each other. The bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component (PCI) bus or an Extended Industry Standard Architecture (EISA) bus. The bus can be divided into an address bus, a data bus, a control bus, etc. For ease of representation, Figure 4 Only one thick line is used in the diagram, but this does not mean that there is only one bus or only one type of bus.

[0114] Optionally, in a specific implementation, if the memory 401, the processor 402 and the communication interface 403 are integrated on a chip, the memory 401, the processor 402 and the communication interface 403 can communicate with each other through an internal interface.

[0115] The processor 402 may be a central processing unit (CPU), or an application specific integrated circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of the present application.

[0116] This embodiment also provides a computer-readable storage medium on which a computer program is stored. When the program is executed by a processor, the above-mentioned method for charging an electric vehicle is implemented.

[0117] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or N embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0118] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, "N" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0119] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, fragment or portion of code comprising one or more executable instructions for implementing the steps of a custom logical function or process, and the scope of the preferred embodiments of the present application includes alternative implementations in which functions may not be performed in the order shown or discussed, including performing functions in a substantially simultaneous manner or in reverse order depending on the functions involved, which should be understood by technicians in the technical field to which the embodiments of the present application belong.

[0120] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as an ordered list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by an instruction execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch instructions from an instruction execution system, device or apparatus and execute instructions), or in combination with these instruction execution systems, devices or apparatuses. For the purpose of this specification, "computer-readable medium" can be any device that can contain, store, communicate, propagate or transmit a program for use by an instruction execution system, device or apparatus, or in combination with these instruction execution systems, devices or apparatuses. More specific examples of computer-readable media (a non-exhaustive list) include the following: an electrical connection with one or N wirings (electronic devices), a portable computer disk box (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), a fiber optic device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium may even be paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium and then editing, interpreting or processing in other suitable ways if necessary, and then stored in a computer memory.

[0121] It should be understood that the various parts of the present application can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiment, the N steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0122] A person skilled in the art may understand that all or part of the steps in the method for implementing the above-mentioned embodiment may be completed by instructing related hardware through a program, and the program may be stored in a computer-readable storage medium, which, when executed, includes one or a combination of the steps of the method embodiment.

[0123] In addition, each functional unit in each embodiment of the present application may be integrated into a processing module, or each unit may exist physically separately, or two or more units may be integrated into one module. The above-mentioned integrated module may be implemented in the form of hardware or in the form of a software functional module. If the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it may also be stored in a computer-readable storage medium.

[0124] The storage medium mentioned above may be a read-only memory, a magnetic disk or an optical disk, etc. Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the present application. A person of ordinary skill in the art may change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. A method for charging an electric vehicle, characterized in that: The following steps are involved: Detect the current state of charge of the electric vehicle and the actual temperature of the environment; When it is detected that the current state of charge is greater than a preset threshold value and the actual temperature is less than a preset temperature, calculating a current polarization voltage of the electric vehicle based on the current state of charge and the actual temperature; as well as Controlling the sum of the current static voltage of the electric vehicle and the current polarization voltage within an upper voltage range, generating a charging current matrix corresponding to the current state of charge and the actual temperature of the environment, so as to charge the electric vehicle based on the charging current matrix; Among them, the calculation of the current polarization voltage of the electric vehicle based on the current state of charge and the actual temperature includes: calculating the current static voltage and current polarization internal resistance of the electric vehicle based on the current state of charge and the actual temperature; calculating the current polarization voltage according to the current polarization internal resistance and charging matrix current data.

2. The method according to claim 1, characterized in that The method of controlling the sum of the current static voltage and the current polarization voltage of the electric vehicle within an upper voltage range and generating a charging current matrix corresponding to the current state of charge and the actual temperature of the environment includes: If the sum of the current static voltage of the electric vehicle and the current polarization voltage is greater than the upper limit voltage, the charging current is reduced according to a preset reduction strategy and the current polarization voltage is recalculated; otherwise, the charging current matrix is ​​generated.

3. The method according to claim 1, characterized in that Also includes: The charging current matrix is ​​input into the battery system of the electric vehicle for verification to determine whether a low-temperature charging condition is met, and after the low-temperature charging condition is met, the charging current matrix is ​​used to charge the electric vehicle.

4. A charging device for an electric vehicle, characterized in that: include: A detection module, used to detect the current state of charge of the electric vehicle and the actual temperature of the environment in which it is located; A calculation module, configured to calculate a current polarization voltage of the electric vehicle based on the current state of charge and the actual temperature when it is detected that the current state of charge is greater than a preset threshold and the actual temperature is less than a preset temperature; as well as A charging module, used to control the sum of the current static voltage of the electric vehicle and the current polarization voltage within an upper voltage range, generate a charging current matrix corresponding to the current state of charge and the actual temperature of the environment, so as to charge the electric vehicle based on the charging current matrix; The calculation module is specifically used to: calculate the current static voltage and current polarization internal resistance of the electric vehicle based on the current state of charge and the actual temperature; and calculate the current polarization voltage according to the current polarization internal resistance and charging matrix current data.

5. The device according to claim 4, characterized in that The charging module is specifically used for: If the sum of the current static voltage of the electric vehicle and the current polarization voltage is greater than the upper limit voltage, the charging current is reduced according to a preset reduction strategy and the current polarization voltage is recalculated; otherwise, the charging current matrix is ​​generated.

6. The device according to claim 4, characterized in that Also includes: A control module is used to input the charging current matrix into the battery system of the electric vehicle for verification, determine whether the low-temperature charging condition is met, and use the charging current matrix to charge the electric vehicle after the low-temperature charging condition is met.

7. A vehicle, characterized in that: include: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the charging device for an electric vehicle as described in any one of claims 1 to 4.

8. A computer-readable storage medium having a computer program stored thereon, characterized in that: The program is executed by a processor to implement the charging device for an electric vehicle as described in any one of claims 1 to 4.

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