Charging current control method, battery management system and electric vehicle

Abstract

The invention discloses a charging current control method, a battery management system and an electric vehicle, and relates to the technical field of electric vehicles, the method comprises the following steps: when a first charging request current of a first charging port is less than a first current threshold, controlling the first charging request current to increase; wherein the first current threshold value is the minimum value of the maximum allowable current of the first charging port and the maximum allowable current of the first charging pile corresponding to the first charging port; and when the first charging request current is greater than the first current threshold, controlling the first charging request current to be reduced. Whether the current applied by the first charging port reaches the allowable limit value or not is judged in real time, and the current is flexibly subjected to lifting adjustment, so that the actually applied current is always kept within the safe bearing range of the battery and the charging pile, the problem that in the prior art, a current fixed distribution mode easily causes current over-limit is solved, and the service life of the battery is prolonged. And the reliability and the efficiency of the charging process are obviously improved.

Description

Technical Field

[0001] The present application relates to the technical field of electric vehicles, and in particular to a charging current control method, a battery management system and an electric vehicle. Background Art

[0002] Currently, the charging method for electric vehicles with multiple charging ports on the market generally uses a simple dual-charging solution that divides the current equally. This lacks comprehensive consideration of the battery's allowable charging current, the actual output capacity of the charging pile, and the vehicle's wiring harness and charging socket's carrying capacity. This can easily lead to charging failures such as overcurrent and overpower, resulting in low charging efficiency and poor safety, affecting the user experience. Therefore, a multi-pile, multi-charging current control solution is urgently needed that can integrate these multiple factors and dynamically adjust the charging request current.

[0003] The above information disclosed in this Background section is included only for enhancement of understanding of the background of the disclosure and therefore it may contain information that does not form the relevant art that is currently known to a person of ordinary skill in the art. Summary of the Invention

[0004] The present application provides a charging current control method, a battery management system and an electric vehicle to solve the problems of low charging efficiency and easy overcurrent risk in the existing charging method of fixed current distribution.

[0005] This application adopts the following technical solutions:

[0006] In a first aspect, the present application provides a charging current control method, comprising:

[0007] When the first charging request current of the first charging port is less than a first current threshold, controlling the first charging request current to increase; wherein the first current threshold is the minimum value between the maximum allowable current of the first charging port and the maximum allowable current of the first charging pile corresponding to the first charging port;

[0008] When the first charge request current is greater than the first current threshold, the first charge request current is controlled to decrease.

[0009] This application monitors the relationship between the first charging request current and the first current threshold in real time, and dynamically adjusts the first charging request current so that the charging current is always within the allowable range of the battery, charging pile and related components, avoiding the overcurrent risk caused by the fixed distribution current in the traditional charging method, and effectively improving the charging efficiency and safety.

[0010] In conjunction with the first aspect, in an optional implementation, controlling the first charging request current to increase includes:

[0011] Obtaining a difference between a first charging request current and a first current threshold, and determining a first adjustment amount based on the difference and a first preset proportional value; wherein the first preset proportional value is a positive number less than 1;

[0012] The first charging request current is increased according to the first adjustment amount.

[0013] This application multiplies the difference between the first charging request current and the corresponding current limit by a proportional coefficient less than 1 to determine the current adjustment range and gradually increase the charging request current. This can avoid overshoot during the current adjustment process, make the charging current change more stable and accurate, and improve the safety and stability of the charging process.

[0014] In conjunction with the first aspect, in an optional implementation, controlling the first charging request current to decrease includes:

[0015] Obtaining a difference between a first charging request current and a first current threshold, and determining a second adjustment amount based on the difference;

[0016] The first charge request current is reduced according to the second adjustment amount.

[0017] This application compares the first charging request current with the corresponding current threshold and determines the reduction range based on the difference between the two, thereby reducing the charging request current level in real time. This adjustment method allows for timely and effective reduction of excessive current, preventing the current from exceeding the safe range.

[0018] In conjunction with the first aspect, in an optional implementation, the method further includes:

[0019] When a power limit signal for the first charging port is received, the first current threshold is reduced according to a preset coefficient; wherein the preset coefficient is a value between 0 and 1.

[0020] This application can quickly respond to external power limitation requirements and adjust the output current of the charging port in a timely manner when receiving a power limitation signal for the first charging port, thereby effectively avoiding the risk of power overlimit.

[0021] In combination with the first aspect, in an optional implementation, the preset coefficient is 1 / n, where n is the number of charging ports currently charging simultaneously.

[0022] This application can achieve balanced current distribution among multiple charging ports by setting the preset coefficient to the inverse of the number of charging ports currently charging simultaneously (i.e. 1 / n), ensuring that current resources are reasonably and evenly distributed among each charging port, thereby improving the safety, stability and fairness of the charging process.

[0023] In conjunction with the first aspect, in an optional implementation, the method further includes:

[0024] When a power limit signal for the first charging port is received, obtaining a battery allowed charging current, and determining a difference between the battery allowed charging current and the first charging request current as a first adjustment value;

[0025] Determine the minimum value among the allowable charging current of the battery, the maximum allowable current of the second charging port, and the maximum allowable current of the second charging pile corresponding to the second charging port as the second adjustment value;

[0026] The smaller of the first adjustment value and the second adjustment value is determined as a target value, and the second charge request current is controlled to reach the target value.

[0027] This application determines a suitable target value and controls the charging request current of the second charging port to reach the target value by comprehensively considering the difference between the battery's allowed charging current and the charging request current, as well as the allowed current limits of other charging ports and charging piles when receiving a power limit signal for the first charging port. This achieves dynamic coordinated allocation among multiple charging ports, can respond to power limit requirements in a timely manner, make full use of charging resources, effectively avoid the risk of charging current exceeding the limit, and improve the safety and stability of the simultaneous charging process of multiple charging ports.

[0028] In combination with the first aspect, in an optional implementation, controlling the second charging request current to reach a target value includes:

[0029] Determining a third adjustment amount based on the target value and a second preset ratio value; wherein the second preset ratio value is a positive number less than 1;

[0030] The second charging request current is adjusted according to the third adjustment amount to reach the target value.

[0031] The present application introduces a second preset ratio value less than 1, determines a third adjustment amount based on the target value and the second preset ratio value, and uses the determined third adjustment amount to adjust the second charging request current so that the second charging request current smoothly reaches the target value, avoiding drastic fluctuations in the charging current, and improving the stability and smoothness of the current adjustment during the charging process, thereby effectively protecting the battery and charging equipment, and improving the safety of the charging process and user experience.

[0032] In conjunction with the first aspect, in an optional implementation, the method further includes:

[0033] Obtain the battery's allowable charging current, the maximum allowable current of the first charging port, the maximum allowable current of the second charging port, the maximum allowable current of the first charging pile corresponding to the first charging port, and the maximum allowable current of the second charging pile corresponding to the second charging port;

[0034] Set initial values ​​of the first charging request current and the second charging request current, and meet the following requirements: the initial value of the first charging request current does not exceed the first current threshold, the initial value of the second charging request current does not exceed the second current threshold, and the sum of the initial value of the first charging request current and the initial value of the second charging request current does not exceed the allowable charging current of the battery.

[0035] This application comprehensively considers the battery's allowable charging current, the maximum allowable current of multiple charging ports and the corresponding charging piles at the beginning of charging, and reasonably sets the initial values ​​of the first charging request current and the second charging request current to ensure that the initial charging request current of each charging port is within a safe range while meeting the restrictions of the charging equipment and battery, effectively avoiding the risk of current exceeding the limit in the initial charging stage, ensuring that the charging process is carried out safely and stably, and improving the reliability and operational efficiency of charging management.

[0036] In a second aspect, the present application further provides a battery management system. The battery management system includes a memory and a processor, wherein the memory is used to store a computer program or instruction, and when the computer program or instruction is executed by the processor, the method of the first aspect or any possible implementation of the first aspect is implemented.

[0037] In a third aspect, the present application provides an electric vehicle. The electric vehicle includes the battery management system described in the second aspect and a vehicle controller, the vehicle controller being communicatively connected to the battery management system and configured to receive a first instruction corresponding to a first charging request current and / or a second instruction corresponding to a second charging request current output by the battery management system, and to control the vehicle charging process according to the first instruction and / or the second instruction.

[0038] The beneficial effects of the second and third aspects above can be referred to the first aspect or any possible implementation of the first aspect, and will not be described in detail here. Based on the implementations provided in the above aspects, this application can also be further combined to provide more implementations.

[0039] Other advantages, objectives and features of the present application will be reflected in part through the following description, and in part will be understood by those skilled in the art through study and practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] In order to more clearly illustrate the technical solutions in the embodiments of the present application or related technologies, the following briefly introduces the drawings required for use in the embodiments or related technical descriptions. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0041] Figure 1 This is one of the flow charts of the charging current control method provided in the embodiment of the present application;

[0042] Figure 2 This is the second flow chart of the charging current control method provided in the embodiment of the present application;

[0043] Figure 3 This is the third flow chart of the charging current control method provided in the embodiment of the present application;

[0044] Figure 4 This is a schematic diagram of the structure of the battery management system provided in an embodiment of the present application;

[0045] Figure 5 It is a structural schematic diagram of an electric vehicle provided in an embodiment of the present application. DETAILED DESCRIPTION

[0046] It should be noted that, in this application, words such as "exemplary" or "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described in this application as "exemplary" or "for example" should not be construed as being preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "for example" is intended to present the relevant concepts in a concrete manner.

[0047] The term "and / or" as used in this application includes any and all combinations of one or more related listed items. Terms containing ordinal numbers such as "first" and "second" used in this application can be used to describe various constituent elements, but these constituent elements are not limited by these terms. The purpose of using these terms is only to distinguish one constituent element from other constituent elements and cannot be understood as indicating or implying relative importance. For example, without departing from the scope of the rights of this application, the first constituent element can be named as the second constituent element, and similarly, the second constituent element can also be named as the first constituent element.

[0048] Before introducing the embodiments of the present application, the background technology involved in the present application is first introduced.

[0049] Currently, the charging process for electric vehicles generally fails to fully consider factors such as the allowable charging current of the power battery, the actual output capacity of the charging pile, and the load capacity of the vehicle wiring harness and charging socket. Traditional charging current control methods typically use a simple current equalization method, which can easily lead to charging failures such as overcurrent and overpower, reducing charging efficiency and affecting charging safety, making it difficult to meet the growing demand for intelligent charging. Therefore, there is an urgent need to develop an intelligent charging current control method that can dynamically and comprehensively consider multiple charging factors in real time and accurately adjust the charging current to improve charging efficiency and safety, and enhance the user charging experience.

[0050] In summary, the charging current control methods in related technologies have the problem of difficulty in precisely adjusting the allowable charging current of the power battery, the output capacity of the charging pile, and the load capacity of the components. The following describes the technical solution of this application in detail through multiple embodiments. It should be noted that these embodiments can be implemented in a variety of different forms and should not be construed as being limited to the embodiments described herein.

[0051] refer to Figure 1 , Figure 1 It is one of the flow charts of the charging current control method provided in the embodiment of the present application. It should be noted that this specification provides the method operation steps as described in the embodiment or flowchart, but more or fewer operation steps may be included based on conventional or non-creative labor. The order of steps listed in the embodiment is only one way of executing the order of many steps and does not represent the only execution order. In practice, when the method program is executed, it can be executed in sequence or in parallel according to the method shown in the embodiment or the accompanying drawings (for example, a parallel processor or a multi-threaded processing environment). The method can be executed by a battery management system (BMS) or by a charging controller of a power battery or other control device with corresponding functions. The embodiment of the present application is not limited to this. In the following embodiment, the charging current control method is executed by a battery management system (BMS) as an example for illustrative explanation.

[0052] It should be noted that when a vehicle supports simultaneous charging using two charging ports connected to two charging piles (i.e., "dual-pile charging"), each charging pile and the vehicle usually need to communicate via the CAN bus to achieve functions such as information exchange during the charging process, negotiation of charging requests, and status monitoring. Therefore, to achieve dual-pile charging, the vehicle or battery management system (BMS) needs to be configured with two independent charging CAN communication channels, with each CAN bus communicating with a charging pile respectively. The same applies to multiple piles (three or more).

[0053] For example, assume that the vehicle has two independent charging ports, charging port 1 and charging port 2, and the vehicle can be connected to two charging piles at the same time for charging.

[0054] The first charging interface (charging port 1) communicates with the first charging pile through a CAN bus (denoted as CAN1) to exchange charging-related information (such as charging request current, charging status, fault information, etc.); the second charging interface (charging port 2) communicates with the second charging pile through another independent CAN bus (denoted as CAN2) to also exchange charging-related information.

[0055] In this way, through the two independent CAN communication channels provided by the vehicle / BMS, the vehicle can effectively communicate with the two charging piles at the same time, ensuring the smooth, safe and reliable charging process of the two piles.

[0056] like Figure 1 As shown, the charging current control method includes at least the following steps:

[0057] S101: When a first charging request current of a first charging port is less than a first current threshold, control the first charging request current to increase; wherein the first current threshold is the minimum value between a maximum allowable current of the first charging port and a maximum allowable current of a first charging pile corresponding to the first charging port.

[0058] It should be noted that the first charging request current is recorded as IA, the maximum allowable current of the first charging port is recorded as Imax1, and the maximum allowable current of the first charging pile is recorded as CML-A.

[0059] S103: When the first charging request current is greater than the first current threshold, control the first charging request current to decrease.

[0060] Specifically, there is a predetermined "first current threshold," which is the smaller of the "maximum allowable current the charging port can withstand" and the "maximum allowable current the charging pile can provide." This is done to ensure that the charging current does not exceed the maximum value that either the charging port or the charging pile can safely withstand. During the actual charging process, the relationship between the current requested charging current (called the "first charging request current IA") and the threshold (the first current threshold) is monitored in real time:

[0061] When the actual requested charging current is relatively small (ie, less than the first current threshold), it indicates that there is still room for improvement and the current can be further increased. In this case, the system controls the first charging request current IA to gradually increase, thereby improving charging efficiency.

[0062] When the actual requested charging current exceeds the safety threshold (i.e., greater than the first current threshold), it indicates a potential risk and the current needs to be reduced. At this time, the system controls the first charging request current IA to gradually decrease to ensure the safety of the charging process.

[0063] When the actual requested charging current is consistent with the safety threshold (i.e., equal to the first current threshold), it means that the current charging request current has reached the optimal safety state set by the system. At this time, there is no need to adjust the current to maintain the stability and safety of the charging process.

[0064] Through the above steps, the system monitors and adjusts the charging current in real time to ensure that the charging process is carried out efficiently within a safe range.

[0065] In some embodiments, when the current charging request current needs to be increased, the current is not increased directly to the threshold at one time. Instead, the difference between the current charging request current and the threshold is first calculated, and then a pre-set proportional number (for example, 0.4) with a value less than 1 is multiplied by the difference to obtain an appropriate increase value (i.e., an adjustment amount), and then the current charging request current is gradually increased according to the adjustment amount.

[0066] For example, if the target current (i.e., the current threshold) is 200A and the current requested charging current is 100A, the difference is 200A - 100A = 100A. During the first adjustment, if the ratio is set to 0.5, the adjustment is 100A × 0.5 = 50A, increasing the requested charging current from 100A to 150A. During the second adjustment, the difference is 200A - 150A = 50A, and the adjustment is 50A × 0.5 = 25A, increasing the requested charging current from 150A to 175A. This approach avoids sudden and sharp increases in current, making current adjustment smoother and ensuring a safer charging process.

[0067] In some embodiments, when the current charging request current needs to be reduced, the difference between the current charging request current and the current threshold can be calculated first, and then the difference can be used as the reduction value (i.e., the adjustment amount), and then the current charging request current can be gradually reduced according to the adjustment amount.

[0068] For example, if the current charging request current is 80A and the current threshold is 60A, the difference is 80A-60A=20A. The adjustment amount is directly taken as the difference of 20A. After this adjustment, the current can be reduced from 80A to 60A at one time, reaching the required current threshold in a timely and safe manner.

[0069] Through the above-mentioned method, it can be ensured that the charging request current is more stable and safe during the reduction process, avoiding the risk caused by excessive current during the charging process.

[0070] In some embodiments, reference Figure 2 , Figure 2 This is the second flow chart of the charging current control method provided in the embodiment of the present application. Figure 2 As shown, the method further includes:

[0071] S201: When a power limit signal for a first charging port is received, a first current threshold is reduced according to a preset coefficient.

[0072] Specifically, when the system receives a power limit signal for the first charging port (for example, due to battery overheating, excessive system load, or the charging device's own limitations), the system will actively adjust the first current threshold by multiplying the original threshold by a pre-set coefficient (this coefficient is between 0 and 1, such as 0.8).

[0073] For example, if the initial current threshold is 100 A and a power limit signal is received with a preset coefficient of 0.8, the threshold will be adjusted to 100 A × 0.8 = 80 A. This lowers the target charge current, keeping the charging current within a safe and controllable range, avoiding the risk of excessive power and ensuring a safe and stable charging process.

[0074] In addition, when a power battery failure or a charging pile failure occurs, the charging current control method provided in this application can be used to quickly adjust the current to a safe threshold. For example, when a charging pile fails, the charging request current corresponding to the charging pile can be quickly reduced to zero.

[0075] In some embodiments, the preset coefficient is 1 / n, where n is the number of charging ports currently charging simultaneously.

[0076] Specifically, when there are multiple charging ports charging simultaneously in the system, in order to ensure the overall power limit requirements of the system, the power limit signal for a certain charging port will cause the system to adjust the current threshold of the charging port according to the number of charging ports currently charging simultaneously. The preset coefficient used for the adjustment is set to 1 / n (n represents the number of charging ports currently charging simultaneously).

[0077] For example, if two charging ports are charging simultaneously in the system (n=2), and the original current threshold of the first charging port is 100A, then after receiving the power limit signal, the current threshold of the first charging port will be reduced to 1 / 2 of the original current threshold, that is, 100A×(1 / 2)=50A. If there are four charging ports charging simultaneously (n=4), and the original current threshold is 100A, then after receiving the power limit signal, the current threshold of the first charging port will be adjusted to 100A×(1 / 4)=25A.

[0078] In this way, the system can dynamically adjust the current threshold of each charging port according to the current actual number of charging devices, ensuring that the overall power is controlled within a safe range, thereby effectively preventing the charging system from overloading and improving the safety and stability of the charging process.

[0079] In some embodiments, the method further comprises:

[0080] S203: When a power limit signal for the first charging port is received, obtain the battery allowed charging current, and determine the difference between the battery allowed charging current and the first charging request current as a first adjustment value.

[0081] S205: Determine a minimum value among the allowable charging current of the battery, the maximum allowable current of the second charging port, and the maximum allowable current of the second charging pile corresponding to the second charging port as a second adjustment value.

[0082] S207: Determine the smaller one of the first adjustment value and the second adjustment value as the target value, and control the second charging request current to reach the target value.

[0083] It should be noted that the second charging request current is recorded as IB, the maximum allowable current of the second charging port is recorded as Imax2, the maximum allowable current of the second charging pile is recorded as CML-B, and the battery allowable charging current is recorded as I.

[0084] Specifically, when the system receives a power limit signal for a certain charging port (such as the first charging port), in order to achieve overall power optimization and safety assurance, the system will dynamically adjust the charging request current of other charging ports (such as the second charging port).

[0085] Exemplarily, a "first adjustment value" is first determined, that is, the battery allowable charging current I (the maximum safe charging current acceptable under the current state of the battery) is obtained, and the battery allowable charging current I is compared with the first charging request current IA, and the difference between the two is calculated as the first adjustment value (for example, if the battery allowable charging current I is 100A and the first charging request current IA is 80A, then the first adjustment value is 20A, indicating that the current needs to be increased by 20A);

[0086] Next, determine the "second adjustment value." This involves obtaining the battery's allowable charging current I, the second charging port's maximum allowable current (a safety upper limit defined by the charging system, line, or equipment), and the charging pile's maximum allowable current corresponding to the second charging port (the charging pile's maximum output capacity). The minimum of these three values ​​is used as the second adjustment value. (For example, if the battery's allowable charging current I is 80A, the second charging port's maximum allowable current is 90A, and the second charging pile's maximum allowable current is 85A, then the second adjustment value is 80A.)

[0087] Then, the first adjustment value is compared with the second adjustment value, and the smaller value is taken as the final target value (for example, if the first adjustment value is 20A and the second adjustment value is 80A, then the target value is 20A, indicating that the current needs to be increased by 20A);

[0088] Finally, according to the determined target value, the charging request current of the second charging port is dynamically adjusted to achieve safe control and optimization of the overall system power.

[0089] It can be seen from this that this embodiment accurately determines the charging current value of other charging ports (such as the second charging port) by simultaneously considering the battery safety limitations, charging port equipment capabilities, charging pile capabilities and current charging request conditions. Therefore, when any charging port is subject to power limitations, it effectively coordinates the power distribution of multiple charging ports to ensure safe and stable operation of the system.

[0090] In some embodiments, the process of controlling the second charging request current IB to reach the target value includes:

[0091] Determining a third adjustment amount based on the target value and a second preset ratio value; wherein the second preset ratio value is a positive number less than 1;

[0092] The second charging request current IB is adjusted according to the third adjustment amount to reach the target value.

[0093] For example, if the current second requested charging current IB has not yet reached the target value, the difference between the current second requested charging current IB and the target value can be calculated. This difference is then multiplied by a second predetermined ratio (the predetermined ratio being a positive number less than 1, such as 0.5 or 0.8) to determine a relatively small adjustment amount (i.e., the third adjustment amount). The second requested charging current IB is then gradually adjusted based on this small adjustment amount to avoid excessive current adjustments.

[0094] For example, assuming the target value is 10A, the current current is 0A, and the second preset ratio is set to 0.5, then during the first adjustment, the current difference is 10A, and the third adjustment amount is 10A × 0.5 = 5A. After this adjustment, the current increases from 0A to 5A. During the second adjustment, the current difference becomes 5A, and the third adjustment amount is 5A × 0.5 = 2.5A. This time, the current increases from 5A to 7.5A. In this way, the current is adjusted successively with gradually decreasing step values, so that the current gradually approaches and ultimately accurately reaches the target value, thereby ensuring a smoother, more accurate, and safer charging current control process.

[0095] In some embodiments, reference Figure 3 , Figure 3 This is the third flow chart of the charging current control method provided in the embodiment of the present application. Figure 3 As shown, the method further includes:

[0096] S301: Obtain the battery's allowable charging current, the maximum allowable current of the first charging port, the maximum allowable current of the second charging port, the maximum allowable current of the first charging pile corresponding to the first charging port, and the maximum allowable current of the second charging pile corresponding to the second charging port;

[0097] S303: Set initial values ​​of the first charging request current and the second charging request current, and satisfy: the initial value of the first charging request current does not exceed the first current threshold, the initial value of the second charging request current does not exceed the second current threshold, and the sum of the initial value of the first charging request current and the initial value of the second charging request current does not exceed the battery allowable charging current.

[0098] Specifically, before charging, it is first necessary to determine the charging current allowed by the current battery; at the same time, obtain the maximum current allowed by the first charging port and the second charging port respectively, as well as the maximum current allowed by the charging piles connected to the two charging ports respectively.

[0099] On this basis, the initial values ​​of the first charging request current IA and the second charging request current IB are set respectively. When setting, multiple conditions must be met at the same time: on the one hand, the initial value of the first charging request current IA cannot exceed the first current threshold (for example, the smaller value of the current allowed by the first charging port and the first charging pile, that is, 80A); on the other hand, the initial value of the second charging request current IB cannot exceed the second current threshold (for example, the smaller value of the current allowed by the second charging port and the second charging pile, that is, 60A); furthermore, the sum of the initial values ​​of the two request currents must not exceed the maximum charging current allowed by the battery itself (for example, 120A).

[0100] For example, assuming that the maximum charging current allowed by the battery is 120A, the maximum charging current of the first charging port is 80A, the maximum charging current of the second charging port is 70A, the maximum current provided by the first charging pile is 100A, and the maximum current provided by the second charging pile is 60A, the initial value of the first charging request current IA can be set to 70A, and the initial value of the second charging request current IB can be set to 50A. In this way, the sum of the two (a total of 120A) just does not exceed the maximum charging current limit allowed by the battery, which not only ensures charging safety but also efficiently utilizes existing charging resources.

[0101] Based on the same technical concept, the present application also provides a battery management system, referring to Figure 4 , Figure 4 This is a schematic diagram of the structure of the battery management system provided in the embodiment of the present application. Figure 4 As shown, the device includes a memory 401 and a processor 402. The memory 401 is used to store computer instructions. When the processor 402 executes the computer instructions, the method steps in any method embodiment are implemented.

[0102] The memory 401 includes at least one type of computer-readable storage medium, including flash memory, random access memory (RAM), static random access memory (SRAM), read-only memory (ROM), etc. In some embodiments, the computer-readable storage medium can be a non-volatile memory within the battery management system, such as flash memory and ROM, for storing firmware program code; in other embodiments, the computer-readable storage medium can also include volatile memory, such as RAM or SRAM, for temporarily storing data or instructions during operation. In this embodiment, the computer-readable storage medium is generally used to store program code installed in the battery management system, parameter information, and various types of data generated during operation.

[0103] In some embodiments, the processor 402 can be a central processing unit (CPU), a controller, a microcontroller (MCU), a microprocessor, or other integrated circuit chip. The processor 402 is generally used to control the overall operation of the battery management system, such as performing control and processing operations related to data exchange or communication with other device entities. In this embodiment, the processor 402 is used to execute program code stored in the memory 401 or process data.

[0104] Based on the same technical concept, the present application also provides an electric vehicle, referring to Figure 5 , Figure 5 This is a schematic diagram of the structure of the electric vehicle provided in the embodiment of the present application. Figure 5 As shown, the electric vehicle includes a battery management system 501 (BMS) and a vehicle control unit (VCU) 502. The VCU and BMS 501 are connected in a communication relationship, enabling data and command transmission between them. The BMS 501 is responsible for calculating the appropriate first charging current request (e.g., requesting a 60A charging current through the vehicle's first charging port) and second charging current request (e.g., requesting a 40A charging current through the vehicle's second charging port) based on factors such as battery status and charging equipment. These current requests are then output to the VCU 502 in the form of instructions. After receiving these instructions from the BMS 501, the VCU 502 controls the actual charging process based on these instructions. For example, the VCU 502 might control the relay on the first charging port to close, allowing a charging current of 60A, based on the first instruction. Simultaneously, the VCU might control the charging equipment on the second charging port to initiate charging, achieving a charging current of 40A, based on the second instruction. In this way, the VCU 502 precisely controls the charging current based on the instructions output by the BMS 501, ensuring the safety and effectiveness of vehicle charging.

[0105] It should be noted that the order of description of the embodiments of the present application does not limit the priority order of the embodiments.

[0106] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by those skilled in the art to which this application belongs. The terms used in this application and in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0107] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of this application, ordinary technicians in this field can also make many forms without departing from the purpose of this application and the scope of protection of the claims. All equivalent transformations made by using the contents of the description and drawings of this application under the inventive concept of this application, or direct / indirect application in other related technical fields are included in the scope of patent protection of this application.

Claims

1. A charging current control method, characterized in that: include: When a first charging request current of the first charging port is less than a first current threshold, controlling the first charging request current to increase; wherein the first current threshold is the minimum value between the maximum allowable current of the first charging port and the maximum allowable current of the first charging pile corresponding to the first charging port; When the first charge request current is greater than the first current threshold, the first charge request current is controlled to decrease.

2. The method according to claim 1, characterized in that The controlling the first charging request current to increase includes: Obtaining a difference between the first charging request current and a first current threshold, and determining a first adjustment amount based on the difference and a first preset ratio value; wherein the first preset ratio value is a positive number less than 1; The first charging request current is increased according to the first adjustment amount.

3. The method according to claim 1, characterized in that The controlling the first charging request current to decrease includes: obtaining a difference between the first charging request current and the first current threshold, and determining a second adjustment amount based on the difference; The first charge request current is reduced according to the second adjustment amount.

4. The method according to any one of claims 1 to 3, characterized in that The method further comprises: When a power limit signal for the first charging port is received, the first current threshold is reduced according to a preset coefficient; wherein the preset coefficient is a value between 0 and 1.

5. The method according to claim 4, characterized in that The preset coefficient is 1 / n, where n is the number of charging ports currently charging simultaneously.

6. The method according to any one of claims 1 to 5, characterized in that The method further comprises: When a power limit signal for the first charging port is received, obtaining a battery allowed charging current, and determining a difference between the battery allowed charging current and the first charging request current as a first adjustment value; Determine the minimum value among the allowable charging current of the battery, the maximum allowable current of the second charging port, and the maximum allowable current of the second charging pile corresponding to the second charging port as the second adjustment value; The smaller one of the first adjustment value and the second adjustment value is determined as a target value, and the second charge request current is controlled to reach the target value.

7. The method according to claim 6, characterized in that The controlling the second charging request current to reach the target value includes: Determining a third adjustment amount based on the target value and a second preset ratio value; wherein the second preset ratio value is a positive number less than 1; The second charging request current is adjusted according to the third adjustment amount to reach the target value.

8. The method according to any one of claims 1 to 7, characterized in that The method further comprises: Obtaining the allowable charging current of the battery, the maximum allowable current of the first charging port, the maximum allowable current of the second charging port, the maximum allowable current of the first charging pile corresponding to the first charging port, and the maximum allowable current of the second charging pile corresponding to the second charging port; Set initial values ​​of the first charging request current and the second charging request current, and satisfy: the initial value of the first charging request current does not exceed a first current threshold, the initial value of the second charging request current does not exceed a second current threshold, and the sum of the initial value of the first charging request current and the initial value of the second charging request current does not exceed the allowable charging current of the battery.

9. A battery management system, characterized in that: The method comprises a memory and a processor, wherein the memory is used to store computer programs or instructions; when the computer program or instructions are executed by the processor, the method according to any one of claims 1 to 8 is implemented.

10. An electric vehicle, characterized in that: It includes the battery management system according to claim 9 and a vehicle controller, the vehicle controller is communicatively connected to the battery management system, and is used to receive a first instruction corresponding to the first charging request current and / or a second instruction corresponding to the second charging request current output by the battery management system, and control the vehicle charging process according to the first instruction and / or the second instruction.

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