A charging current control method and system, electronic device, and storage medium

Abstract

The application provides a charging current control method, system, electronic equipment and storage medium. The method comprises the following steps: obtaining a charging demand current value of a vehicle end based on a sum of a maximum allowed charging current value of a vehicle-mounted battery and a high-voltage accessory consumption current; calculating a charging current value based on the charging demand current value, a maximum allowed charging current value of a pile end and a national standard fast charging current limiting value; obtaining a corresponding charging current coefficient based on a real-time acquired charging port temperature value; obtaining an actual charging current value according to the charging current value and the charging current coefficient, and charging the vehicle-mounted battery based on the actual charging current value. The application calculates the charging demand current value of the vehicle end, then calculates the charging current value of the pile end, calculates the charging coefficient according to the temperature value of the charging port, and charges the vehicle-mounted battery according to the charging current value and the charging current coefficient, thereby reducing the current fault caused by the response mismatch between the vehicle end and the pile end due to the charging current adjustment, improving the charging efficiency and reducing the charging time.

Description

Technical Field

[0001] This invention relates to the field of electric vehicle charging technology, and more specifically, to a charging current control method, system, electronic device, and storage medium. Background Technology

[0002] Battery Management System (BMS), commonly known as a battery nanny or battery manager, is primarily designed for the intelligent management and maintenance of individual battery cells. It prevents overcharging and over-discharging, extends battery life, and monitors battery status. A BMS unit includes the BMS management system, control module, display module, wireless communication module, electrical equipment, battery packs for powering the electrical equipment, and data acquisition modules for collecting battery information from the battery packs.

[0003] With the increasing popularity of electric vehicles (EVs), their charging performance is receiving more and more attention. EV charging typically employs a constant current mode, where the charging station outputs current based on the charging request current sent by the Battery Management System (BMS). The magnitude of the charging request current is primarily determined by the characteristics of the lithium-ion battery and the vehicle's overall capacity; that is, the initial charging request current based on battery characteristics serves as the target charging current. Under certain operating conditions (such as low temperature or high SoC), the initial charging request current is usually relatively small to protect the lithium-ion battery, resulting in the charging speed failing to meet expectations. Therefore, how to further improve the charging speed of EVs is an urgent problem to be solved. Summary of the Invention

[0004] This invention addresses the technical problems existing in the prior art by providing a charging current control method, system, electronic device, and storage medium to solve the problem of how to further improve the charging speed of electric vehicles.

[0005] According to a first aspect of the present invention, a charging current control method is provided, comprising:

[0006] The charging current demand at the vehicle end is obtained by summing the maximum allowable charging current of the vehicle battery and the current consumed by the high-voltage accessories.

[0007] Based on the sum of the charging demand current value and the maximum allowable charging current value at the charging pile, the sum is then multiplied by the national standard fast charging current limit value to find the maximum value, and this maximum value is set as the charging current value.

[0008] Based on the real-time acquired charging port temperature value, the corresponding charging current coefficient is obtained.

[0009] The actual charging current value is obtained based on the charging current value and the charging current coefficient, and the vehicle battery is charged based on the actual charging current value.

[0010] Based on the above technical solution, the present invention can also be improved as follows.

[0011] Preferably, the step of obtaining the vehicle-side charging current demand value based on the sum of the maximum allowable charging current value of the vehicle battery and the current consumed by the high-voltage accessories includes:

[0012] Based on the current state of charge, current temperature value, and battery charging MAP table in the BMS battery system, the maximum allowable charging current value of the vehicle battery is obtained.

[0013] The current consumed by the high-voltage accessory is calculated based on the AC power, DC-DC power and current voltage of the vehicle battery. Then, based on this and the maximum operating charging current value, the charging current demand value at the vehicle end is calculated.

[0014] Preferably, the step of obtaining the corresponding charging current coefficient based on the real-time acquired charging port temperature value includes:

[0015] Real-time acquisition of charging port temperature;

[0016] When the temperature of the charging port is less than 105°C, the charging current coefficient is set to 1.

[0017] When the temperature of the charging port is greater than or equal to 105°C and less than 110°C, the charging current coefficient is set to 0.8.

[0018] When the temperature of the charging port is greater than or equal to 110°C and less than 120°C, the charging current coefficient is set to 0.5.

[0019] When the temperature of the charging port is greater than or equal to 120°C, the charging current coefficient is set to 0, and the charging current is 0.

[0020] Preferably, the charging current control method further includes:

[0021] At the end of charging, the actual charging current value is set to 0.

[0022] Preferably, after the step of obtaining the actual charging current value based on the charging current value and the charging current coefficient, and charging the vehicle battery based on the actual charging current value, the method further includes:

[0023] The state of charge of the vehicle battery is acquired in real time, and the charging current adjustment rate of the vehicle battery is set based on the state of charge.

[0024] Preferably, the step of setting the charging current regulation rate of the vehicle battery based on the state of charge includes:

[0025] When the state of charge is less than 10% or greater than 90%, the charging current regulation rate of the vehicle battery is set to 10A / s;

[0026] When the state of charge is greater than or equal to 10% or less than or equal to 90%, the charging current regulation rate of the vehicle battery is set to 20A / s.

[0027] Preferably, after the step of obtaining the actual charging current value based on the charging current value and the charging current coefficient, and charging the vehicle battery based on the actual charging current value, the method further includes:

[0028] When the maximum output voltage at the charging pile is less than the maximum voltage of the vehicle battery and the vehicle's charge status is greater than 95%, the output current at the charging pile is acquired in real time. When the output current is less than 5A and the duration is greater than 2 minutes, the charging ends.

[0029] According to a second aspect of the present invention, a charging current control system is provided, comprising:

[0030] The demand calculation module is used to obtain the charging demand current value of the vehicle based on the sum of the maximum allowable charging current value of the vehicle battery and the current consumed by the high voltage accessories.

[0031] The output calculation module is used to calculate the minimum value of the minimum charging current demand value and the maximum allowable charging current value at the charging pile end, and then to calculate the minimum value of the minimum value of the minimum value of the minimum value of the national standard fast charging current limit of 250A, and set the minimum value of the minimum value as the charging current value.

[0032] The coefficient acquisition module is used to obtain the corresponding charging current coefficient based on the real-time acquired charging port temperature value.

[0033] The charging control module is used to obtain the actual charging current value based on the charging current value and the charging current coefficient, and to charge the vehicle battery based on the actual charging current value.

[0034] According to a third aspect of the present invention, an electronic device is provided, including a memory and a processor, wherein the processor is configured to implement the steps of any of the charging current control methods described in the first aspect when executing a computer management program stored in the memory.

[0035] According to a fourth aspect of the present invention, a computer-readable storage medium is provided, on which a computer management class program is stored, wherein when executed by a processor, the computer management class program implements the steps of any of the charging current control methods of the first aspect described above.

[0036] This invention provides a charging current control method, system, electronic device, and storage medium. The method includes: obtaining the vehicle-side charging current demand value based on the sum of the maximum allowable charging current value of the vehicle battery and the current consumed by the high-voltage accessories; calculating the charging current value based on the charging current demand value, the maximum allowable charging current value of the charging pile, and the national standard fast charging current limit value; obtaining the corresponding charging current coefficient based on the real-time acquired charging port temperature value; and charging the vehicle battery according to the charging current value and the charging current coefficient. This invention calculates the vehicle-side charging current demand value by using the vehicle battery's charging current demand value, AC power, DC-DC power, and the current voltage of the vehicle battery, then calculates the charging current value of the charging pile, calculates the charging coefficient based on the charging port temperature value, and charges the vehicle battery according to the charging current value and the charging current coefficient. This effectively reduces current faults caused by mismatch between the vehicle-side and charging pile response due to charging current regulation, greatly improves charging efficiency, reduces charging time, and provides over-temperature protection based on the charging port temperature, reducing the occurrence of accidents caused by temperature during charging. Attached Figure Description

[0037] Figure 1 A flowchart of a charging current control method provided by the present invention;

[0038] Figure 2 A schematic diagram of a charging current control system provided by the present invention;

[0039] Figure 3 A schematic diagram of the hardware structure of a possible electronic device provided by the present invention;

[0040] Figure 4 This is a schematic diagram of the hardware structure of a possible computer-readable storage medium provided by the present invention. Detailed Implementation

[0041] The specific embodiments of the present invention will be described in further detail below with reference to the accompanying drawings and examples. The following examples are for illustrative purposes only and are not intended to limit the scope of the invention.

[0042] Figure 1 A flowchart of a charging current control method provided by the present invention is shown below. Figure 1 As shown, the method includes:

[0043] Step S100: Based on the sum of the maximum allowable charging current value of the vehicle battery and the current consumed by the high voltage accessory, obtain the charging current value required by the vehicle.

[0044] It should be noted that the executing entity of the method in this embodiment can be a computer terminal device with data processing, network communication, and program execution functions, such as a computer or a vehicle-mounted computer; it can also be a server device with the same or similar functions, or a cloud server with similar functions. This embodiment does not impose any restrictions on this. For ease of understanding, this embodiment and the following embodiments will be described using a vehicle-mounted computer as an example.

[0045] It is understandable that the current consumed by the aforementioned high-voltage accessories could be the current consumed by high-voltage accessories such as air conditioners.

[0046] Furthermore, the steps for calculating the charging current demand at the vehicle end may also include:

[0047] Step S101: Based on the current state of charge of the vehicle battery, the current temperature value, and the battery charging MAP table in the BMS battery system, obtain the maximum allowable charging current value of the vehicle battery.

[0048] It is understandable that the maximum allowable charging current value of the vehicle battery mentioned above can be obtained from the battery charging MAP table in the BMS battery management system. Under different states of charge (SOC) and temperature conditions in the battery charging MAP table, the vehicle battery has different maximum operating charging current values.

[0049] Step S102: Calculate the current consumed by the high-voltage accessory based on the AC power, DC-DC power and current voltage of the vehicle battery, and then calculate the charging current demand value of the vehicle based on the current consumption and the maximum operating charging current value.

[0050] Specifically, the formula for calculating the charging current demand at the vehicle end is as follows:

[0051] I_0 = Maximum allowable charging current of battery + [(AC power + DC-DC power) / Current battery voltage];

[0052] The maximum allowable charging current of the battery is obtained by the BMS (Battery Management System) based on the battery charging MAP table. Different charging current values ​​correspond to different SOC (State of Charge) and temperature conditions.

[0053] In this embodiment, the charging current demand of the vehicle is calculated by comprehensively considering the charging capacity of the vehicle battery, the power consumption (AC power) of high-voltage accessories such as air conditioning, and the DC-DC power. This allows for the improvement of battery charging efficiency by combining the maximum charging capacity of the vehicle battery. Furthermore, since the information of the vehicle battery can be dynamically acquired, the charging current demand can be adjusted under different states of charge and temperature conditions, thereby ensuring that the vehicle battery is always in a highly efficient charging state. This reduces the charging time of the vehicle battery and improves the driver's driving experience.

[0054] Step S200: Based on the sum of the charging demand current value and the maximum allowable charging current value at the charging pile, the summation result is compared with the national standard fast charging current limit value to find the maximum value, and the maximum value is set as the charging current value;

[0055] It is understandable that the maximum allowable charging current value at the pile end can be obtained by obtaining the maximum allowable charging current value at the pile end based on the signal CML_MaxOutput_Current sent by the pile end. Since the GB 27930 standard specifies that this current is negative, the absolute value needs to be taken.

[0056] In practical implementation, it is necessary to consider both the vehicle-side charging capacity and the charging pile's output capacity. It is also necessary to take into account the current-carrying capacity of the cables and charging bases in the national standard fast charging, thus requiring the charging current to be limited to below 250A. Therefore, the maximum allowable charging current can be calculated comprehensively.

[0057] I_1=Min[Min(I_0, |CML_MaxOutput_Current|), 250A].

[0058] Step S300: Based on the real-time acquired charging port temperature value, obtain its corresponding charging current coefficient f;

[0059] In practice, since overheating of the charging port can cause overheating problems, the charging current coefficient needs to be dynamically adjusted according to the temperature of the charging port during the charging process to reduce the occurrence of overheating problems. Common overheating problems mainly include situations such as vehicle fire and spontaneous combustion.

[0060] Furthermore, considering the issue of overheating at the charging port during charging, derating charging is implemented, and strategies for calculating the charging current coefficient include:

[0061] a. When the charging port temperature is <105℃, the charging current coefficient is 1;

[0062] b. When the charging port temperature is between 105 and 110°C, the charging current coefficient is 0.8;

[0063] c. When the charging port temperature is between 110 and 120 degrees Celsius, the charging current coefficient is 0.5.

[0064] d. When the charging port temperature is >= 120℃, the machine will shut down due to over-temperature, the charging current coefficient will be 0, and the charging current will be 0.

[0065] In summary, the actual charging current request can be obtained as: I_2=f*I_1.

[0066] In this embodiment, by acquiring the temperature value of the charging port in real time and using the temperature value as the adjustment basis, the charging current coefficient is dynamically adjusted according to the preset system adjustment strategy, thereby realizing derated charging of the vehicle battery. This greatly reduces the probability of vehicle spontaneous combustion caused by excessive charging current leading to excessive charging port temperature, and reduces charging stoppage caused by current mismatch. It significantly improves the charging safety of the vehicle battery, enhances charging efficiency, and improves charging stability.

[0067] Step S400: Obtain the actual charging current value based on the charging current value and the charging current coefficient, and charge the vehicle battery based on the actual charging current value.

[0068] In practice, during the initial charging stage, the vehicle battery can be charged according to the above charging current value and the above charging current coefficient. As the state of charge of the vehicle battery and the temperature of the charging port change, the charging current coefficient will be adjusted in real time. In order to reduce the overcurrent fault caused by sudden changes in charging current, the rate of change of current also needs to be adjusted, thereby optimizing the entire charging process of the vehicle battery, thereby improving efficiency and charging safety.

[0069] Understandably, given the deficiencies in the background technology, this invention proposes a charging current control method. The method includes: obtaining the vehicle's charging current demand value based on the sum of the maximum allowable charging current value of the vehicle battery and the current consumed by the high-voltage accessories; calculating the charging current value based on the charging current demand value, the maximum allowable charging current value of the charging pile, and the national standard fast charging current limit value; obtaining the corresponding charging current coefficient based on the real-time acquired charging port temperature value; and charging the vehicle battery according to the charging current value and the charging current coefficient. This invention calculates the vehicle's charging current demand value using the vehicle battery's charging current demand value, AC power, DC-DC power, and the current voltage of the vehicle battery, then calculates the charging current value of the charging pile, calculates the charging coefficient based on the charging port temperature value, and charges the vehicle battery according to the charging current value and the charging current coefficient. This effectively reduces current faults caused by mismatch between the vehicle and charging pile responses due to charging current regulation, greatly improves charging efficiency, reduces charging time, and provides over-temperature protection based on the charging port temperature, reducing the occurrence of accidents caused by temperature during charging.

[0070] In one possible embodiment, after the step of obtaining the actual charging current value based on the charging current value and the charging current coefficient, and charging the vehicle battery based on the actual charging current value, the method further includes:

[0071] Step S500: Obtain the state of charge of the vehicle battery in real time, and set the charging current adjustment rate of the vehicle battery based on the state of charge.

[0072] In practical implementation, after calculating the real-time charging current of the vehicle, the current regulation rate needs to be considered. This is because the allowable charging current varies at different states of charge (SOCs) and changes in a stepped manner; additionally, the demand current changes caused by sudden switching on and off of the air conditioning during charging must be taken into account. Therefore, it is necessary to consider system instability caused by sudden current changes, leading to faults such as overcurrent, and to adjust the current change rate accordingly. Since the battery charging capacity varies under different SOC conditions—for example, the allowable charging capacity is lower at lower and higher SOCs, and higher at intermediate SOCs—the allowable charging current must also be considered for different SOC ranges.

[0073] Furthermore, the aforementioned current regulation speed adjustment strategy also includes:

[0074] When the state of charge is less than 10% or greater than 90%, the charging current regulation rate of the vehicle battery is set to 10A / s; when the state of charge is greater than or equal to 10% or less than or equal to 90%, the charging current regulation rate of the vehicle battery is set to 20A / s.

[0075] Furthermore, since different batteries will have different charging current MAPs, the above-mentioned current adjustment rate can also be calibrated according to the actual charging of the vehicle.

[0076] Furthermore, since GB 18487 stipulates that the output current at the charging station must decrease at a rate of at least 100A / s at the end of charging, the current requested by the vehicle must decrease rapidly at the end of charging. Therefore, at the end of charging (including the end of normal charging and charging stoppage due to fault), the vehicle will set the requested current to 0.

[0077] In this embodiment, the allowable charging current varies at different states of charge (SOC) of the battery, and this variation is stepped. Furthermore, the demand current changes caused by sudden switching on and off of the air conditioning during charging must be considered. Therefore, system instability due to sudden current changes leading to overcurrent and other faults needs to be addressed, necessitating adjustment of the current change rate. By real-time monitoring of the vehicle battery's state of charge, the charging current adjustment rate can be set, effectively reducing the probability of current faults caused by vehicle-to-charger mismatch due to charging current adjustment.

[0078] In one possible embodiment, after the step of obtaining the actual charging current value based on the charging current value and the charging current coefficient, and charging the vehicle battery based on the actual charging current value, the method further includes:

[0079] Step S600: When the maximum output voltage at the charging pile is less than the maximum voltage of the vehicle battery and the vehicle's charge status is greater than 95%, the output current at the charging pile is acquired in real time. When the output current is less than 5A and the duration is greater than 2 minutes, the charging is terminated.

[0080] In practical implementation, for batteries with high-voltage platforms, when using charging stations, the maximum output voltage at the charging station may be lower than the battery's full-charge voltage. For example, if the battery's maximum voltage is 760V, when using a 750V charging station, as charging progresses and the voltage approaches 750V, the charging station will enter a constant-voltage float charging state, maintaining a small current output until it reaches 750V and stops. To avoid excessively long charging times at the end, the vehicle needs to implement timeout handling. A possible strategy is: if SOC > 95%, and the charging station's output current |CCS_OutputCurrent| < 5A for 2 minutes, then the vehicle actively terminates charging. The current threshold can be calibrated based on actual charging data.

[0081] In this embodiment, by acquiring the state of charge of the vehicle battery and the output current of the charging pile in real time, and actively ending the charging when the state of charge is greater than a set threshold and the output current of the charging pile is continuously low, the probability of float charging at the end of the high-voltage platform battery charging problem is reduced, thereby reducing the probability of the vehicle battery charging time being too long at the end of the charging process.

[0082] In one possible application scenario, during fast charging of electric vehicles, to further optimize charging time, improve charging safety, and enhance charging stability, the vehicle-side current demand can be calculated first. This involves considering the battery's allowable charging capacity, the power consumption of high-voltage accessories such as air conditioning, DC-DC power, and the current battery voltage to determine the vehicle-side charging current requirement. Then, the maximum allowable charging current value at the charging station is obtained based on the signal transmitted from the charging station. Furthermore, considering both the vehicle-side charging capacity and the charging station's output capacity, and taking into account the current-carrying capacity of cables and charging sockets in national standard fast charging, the charging current is limited to below 250A. This comprehensive calculation yields the maximum allowable charging current. It also needs to consider the issue of overheating at the charging port during the charging process and adjust the charging current coefficient in real time. Additionally, the current regulation rate is adjusted according to different states of charge (SOC) ranges to reduce system instability and overcurrent caused by sudden changes in current demand due to switching on or off high-power appliances like air conditioning during charging. Finally, at the end of the charging process, charging is terminated when the vehicle battery's SOC reaches a preset threshold.

[0083] In this application scenario, during charging, when the charging port temperature is below 105℃, the charging current coefficient is set to 1. As charging progresses, the charging port temperature gradually increases. When the charging port temperature is between 105℃ and 110℃, the charging current coefficient is set to 0.8; when the charging port temperature rises to between 110℃ and 120℃, the charging current coefficient is set to 0.5; when the charging port temperature is greater than or equal to 120℃, due to the potential risk of overheating, an over-temperature shutdown is initiated, and the charging current coefficient and charging current are both reduced to 0. This achieves the goal of dynamically controlling the charging current based on the charging port temperature.

[0084] In this application scenario, this embodiment calculates the vehicle-side charging current demand value based on the vehicle battery's charging current demand value, AC power, DC-DC power, and the vehicle battery's current voltage. Then, it calculates the charging current value at the charging pile end and calculates the charging coefficient based on the charging port temperature. The vehicle battery is then charged based on the charging current value and the charging current coefficient, thereby effectively reducing current faults caused by mismatch between the vehicle-side and charging pile-side responses due to charging current adjustment. This significantly improves charging efficiency, reduces charging time, and provides over-temperature protection based on the charging port temperature, reducing the occurrence of accidents caused by temperature during charging.

[0085] Please see Figure 2 , Figure 2 This is a schematic diagram of a charging current control system provided in an embodiment of the present invention, as shown below. Figure 2 As shown, a charging current control system includes a demand calculation module 100, an output calculation module 200, a coefficient acquisition module 300, and a charging control module 400, wherein:

[0086] The demand calculation module 100 is used to obtain the charging demand current value of the vehicle end based on the sum of the maximum allowable charging current value of the vehicle battery and the current consumed by the high voltage accessory; the output calculation module 200 is used to calculate the minimum value of the charging demand current value and the minimum value of the maximum allowable charging current value of the charging pile end, and then calculate the minimum value of the minimum value of the minimum value of the minimum value of the fast charging pile end and the national standard fast charging current limit value of 250A, and set the minimum value of the minimum value as the charging current value; the coefficient acquisition module 300 is used to obtain the corresponding charging current coefficient based on the real-time acquired charging port temperature value; the charging control module 400 is used to obtain the actual charging current value according to the charging current value and the charging current coefficient, and charge the vehicle battery based on the actual charging current value.

[0087] It is understood that the charging current control system provided by the present invention corresponds to the charging current control method provided in the foregoing embodiments. The relevant technical features of the charging current control system can be referred to the relevant technical features of the charging current control method, and will not be repeated here.

[0088] Please see Figure 3 , Figure 3 This is a schematic diagram illustrating an embodiment of the electronic device provided in this invention. For example... Figure 3 As shown, this embodiment of the invention provides an electronic device, including a memory 1310, a processor 1320, and a computer program 1311 stored in the memory 1310 and executable on the processor 1320. When the processor 1320 executes the computer program 1311, it performs the following steps:

[0089] The charging current demand at the vehicle end is obtained by summing the maximum allowable charging current of the vehicle battery and the current consumed by the high-voltage accessories. The minimum value of the charging current demand and the maximum allowable charging current at the charging pile is then calculated by subtracting the minimum value from the national standard fast charging current limit of 250A, and this minimum value is set as the charging current value. The corresponding charging current coefficient is obtained based on the real-time acquired charging port temperature. The vehicle battery is then charged according to the aforementioned charging current value and the aforementioned charging current coefficient.

[0090] Please see Figure 4 , Figure 4 This is a schematic diagram illustrating an embodiment of a computer-readable storage medium provided by the present invention. (See diagram below.) Figure 4 As shown, this embodiment provides a computer-readable storage medium 1400, on which a computer program 1411 is stored. When the computer program 1411 is executed by a processor, it performs the following steps:

[0091] The charging current demand at the vehicle end is obtained by summing the maximum allowable charging current of the vehicle battery and the current consumed by the high-voltage accessories. The minimum value of the charging current demand and the maximum allowable charging current at the charging pile is then calculated by subtracting the minimum value from the national standard fast charging current limit of 250A, and this minimum value is set as the charging current value. The corresponding charging current coefficient is obtained based on the real-time acquired charging port temperature. The vehicle battery is then charged according to the aforementioned charging current value and the aforementioned charging current coefficient.

[0092] This invention provides a charging current control method, system, electronic device, and storage medium. The method includes: obtaining the charging demand current value at the vehicle end based on the sum of the maximum allowable charging current value of the vehicle battery and the current consumed by the high-voltage accessories; calculating the minimum value between the minimum value of the charging demand current value and the minimum value of the maximum allowable charging current value at the charging pile end, and then calculating the minimum value of the minimum value of the minimum value of the minimum value of the national standard fast charging current limit of 250A, and setting the minimum value of the minimum value as the charging current value; obtaining the corresponding charging current coefficient based on the real-time acquired charging port temperature value; and charging the vehicle battery according to the above charging current value and the above charging current coefficient. This invention calculates the vehicle-side charging current demand based on the vehicle battery's charging current requirement, AC power, DC-DC power, and the current voltage of the vehicle battery. It then calculates the charging current at the charging station and calculates the charging coefficient based on the charging port temperature. The vehicle battery is then charged according to the charging current value and the charging current coefficient. This effectively reduces current faults caused by mismatch between the vehicle-side and charging station responses due to charging current adjustment, greatly improving charging efficiency and reducing charging time. Furthermore, it provides over-temperature protection based on the charging port temperature, reducing the occurrence of accidents caused by temperature during charging.

[0093] It should be noted that the descriptions of each embodiment in the above embodiments have different focuses. For parts that are not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0094] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0095] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded computer, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0096] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0097] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0098] Although preferred embodiments of the invention have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including both the preferred embodiments and all changes and modifications falling within the scope of the invention.

[0099] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A charging current control method, characterized in that, The method includes: obtaining the charging current demand value at the vehicle end based on the sum of the maximum allowable charging current value of the vehicle battery and the current consumed by the high voltage accessory; The step of obtaining the charging demand current value of the vehicle based on the sum of the maximum allowable charging current value of the vehicle battery and the current consumed by the high voltage accessory includes: obtaining the maximum allowable charging current value of the vehicle battery based on the current state of charge of the vehicle battery, the current temperature value and the battery charging MAP table in the BMS battery system. The current consumed by the high-voltage accessory is calculated based on the AC power, DC-DC power and current voltage of the vehicle battery. Then, based on this and the maximum allowable charging current value, the charging current demand value at the vehicle end is calculated. Based on the minimum value of the charging demand current value and the maximum allowable charging current value at the charging pile, the minimum value is then calculated by subtracting the minimum value from the national standard fast charging current limit value of 250A, and the minimum value is set as the charging current value. Based on the real-time acquired charging port temperature value, the corresponding charging current coefficient is obtained. The actual charging current value is obtained based on the charging current value and the charging current coefficient, and the vehicle battery is charged based on the actual charging current value; the state of charge of the vehicle battery is acquired in real time, and the charging current regulation rate of the vehicle battery is set based on the state of charge; when the state of charge is less than 10% or greater than 90%, the charging current regulation rate of the vehicle battery is set to 10A / s. When the state of charge is greater than or equal to 10% or less than or equal to 90%, the charging current regulation rate of the vehicle battery is set to 20A / s.

2. The charging current control method according to claim 1, characterized in that, The step of obtaining the corresponding charging current coefficient based on the real-time acquired charging port temperature value includes: acquiring the charging port temperature value in real time. When the temperature of the charging port is less than 105°C, the charging current coefficient is set to 1. When the temperature of the charging port is greater than or equal to 105°C and less than 110°C, the charging current coefficient is set to 0.

8. When the temperature of the charging port is greater than or equal to 110°C and less than 120°C, the charging current coefficient is set to 0.

5. When the temperature of the charging port is greater than or equal to 120°C, the charging current coefficient is set to 0, and the charging current value is 0.

3. The charging current control method according to claim 1, characterized in that, Also includes: At the end of charging, the actual charging current value is set to 0.

4. The charging current control method according to claim 1, characterized in that, After the step of obtaining the actual charging current value based on the charging current value and the charging current coefficient, and charging the vehicle battery based on the actual charging current value, the method further includes: the maximum output voltage at the charging pile terminal is less than the maximum voltage of the vehicle battery, and the state of charge is greater than... When the charge reaches 95%, the output current at the end of the pile is acquired in real time. When the output current is less than 5A and the duration is greater than 2 minutes, the charging is stopped.

5. A charging current control system applying the charging current control method as described in any one of claims 1-4, characterized in that, include The demand calculation module is used to obtain the charging demand current value of the vehicle based on the sum of the maximum allowable charging current value of the vehicle battery and the current consumed by the high voltage accessories. The output calculation module is used to calculate the minimum value of the minimum charging current demand value and the maximum allowable charging current value at the charging pile end, and then to calculate the minimum value of the minimum value of the minimum value of the minimum value of the national standard fast charging current limit of 250A, and set the minimum value of the minimum value as the charging current value. The coefficient acquisition module is used to obtain the corresponding charging current coefficient based on the real-time acquired charging port temperature value. The charging control module is used to obtain the actual charging current value based on the charging current value and the charging current coefficient, and to charge the vehicle battery based on the actual charging current value.

6. An electronic device, characterized in that, It includes a memory and a processor, wherein the processor is used to implement the steps of the charging current control method as described in any one of claims 1-4 when executing a computer management program stored in the memory.

7. A computer-readable storage medium, characterized in that, It stores a computer management program, which, when executed by a processor, implements the steps of the charging current control method as described in any one of claims 1-4.

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