Charging control method and device, battery management system and vehicle

Abstract

The embodiment of the present application relates to the battery technical field, disclose a kind of charging control method, device, battery management system and vehicle, the method comprises: when the battery of vehicle satisfies charging demand current adjustment condition, the adjustment rate of charging demand current is determined according to the state parameter of the battery and first mapping relationship, the first mapping relationship is used to show the corresponding relationship between the state parameter of the battery and the adjustment rate of charging demand current;The charging demand current of the battery is adjusted based on the adjustment rate until the battery satisfies charging demand current adjustment stop condition.The technical scheme of the application can solve the problem that the adjustment rate of charging demand current is difficult to adapt to the actual tolerance requirement of power battery under different conditions in the prior art.

Description

Technical Field

[0001] This invention relates to the field of battery technology, specifically to a charging control method, device, battery management system, and vehicle. Background Technology

[0002] As the core energy carrier of electric vehicles, the charging safety of the power battery directly determines the vehicle's performance, reliability, and the safety of users' lives and property. However, in actual charging scenarios, two key factors affect the charging process: first, the charging control strategies of different brands of charging piles vary significantly, and the output current adjustment logic is inconsistent; second, the charging needs of users change in various environments such as low temperature, high temperature, and emergency charging, causing the actual charging current output by the charging pile to often exceed the requested charging current issued by the Battery Management System (BMS), meaning that varying degrees of overcurrent will occur during the charging process of the power battery.

[0003] The dangers of overcurrent during charging are significant. It can cause irreversible damage to the battery cells, accelerate battery degradation and shorten their lifespan. It can also trigger battery thermal runaway, leading to major safety accidents such as fires and explosions, directly threatening the lives and property of users.

[0004] While related technologies can achieve overcurrent detection and protection triggering, the rate at which the charging current demand is adjusted after an overcurrent occurs is mostly a fixed value, without being linked to the real-time state of the battery, making it difficult to adapt to the actual charging needs of the power battery under different conditions. Furthermore, the rate at which the charging current demand is increased after the overcurrent is resolved is mostly fixed, without being linked to the battery's core state parameters, and is disconnected from the battery's tolerance and charging potential under different conditions. Summary of the Invention

[0005] In view of the shortcomings of the prior art, the purpose of this application is to provide a charging control method, device, battery management system and vehicle, which aims to solve the problem that the charging demand current adjustment rate is difficult to adapt to the actual tolerance requirements of power batteries under different conditions in the prior art.

[0006] In a first aspect, embodiments of this application provide a charging control method, comprising: when the battery of a vehicle meets the charging demand current adjustment conditions, determining the adjustment rate of the charging demand current based on the state parameters of the battery and a first mapping relationship, wherein the first mapping relationship is used to characterize the correspondence between the state parameters of the battery and the adjustment rate of the charging demand current; adjusting the charging demand current of the battery based on the adjustment rate until the battery meets the charging demand current adjustment stop condition.

[0007] In the above technical solution, the adjustment rate of the charging demand current is determined based on the battery state parameters and the first mapping relationship, and the adjustment rate is strongly bound to the real-time state of the battery. The first mapping relationship can pre-set differentiated adjustment rates of the charging demand current based on the charging tolerance characteristics of the battery under different state parameters, which solves the adaptability defects of fixed adjustment rates and ensures that overcurrent control under different states conforms to the actual charging needs of the battery.

[0008] In one possible embodiment, the charging demand current adjustment condition includes an input current greater than or equal to an overcurrent fault threshold, and a duration greater than or equal to a first preset duration, wherein the input current is the current flowing into the battery; the overcurrent fault threshold is determined based on the battery's operating parameters at the current moment and a second mapping relationship, the second mapping relationship being used to characterize the correspondence between the battery's operating parameters and the overcurrent fault threshold, wherein the battery's operating parameters include battery SOC and battery temperature; the charging demand current adjustment stop condition includes an input current less than a charging demand current reduction stop determination threshold, and a duration greater than or equal to a second preset duration. SOC is the abbreviation for State Of Charge, which means remaining battery capacity.

[0009] In the above technical solution, the charging current demand adjustment condition is a downward adjustment condition, which is determined by both the input current and the duration to filter out instantaneous over-threshold interference. Downward adjustment is only triggered when the overcurrent state is stable and continuous, avoiding charging interruptions or efficiency losses caused by false triggering. Simultaneously, by reasonably setting the first preset duration, it ensures that the overcurrent response is not delayed, balancing anti-interference capability and response timeliness. Furthermore, by binding the overcurrent fault threshold to the battery's SOC and temperature, the adaptability defects of fixed overcurrent fault thresholds are solved, ensuring that the overcurrent fault threshold adheres to the battery's maximum safety tolerance boundary under any condition, neither wasting tolerance potential nor exceeding the safety upper limit.

[0010] In one possible embodiment, the first mapping relationship is: In the formula, To reduce the rate, For input current, The overcurrent fault threshold, The first preset value is determined based on the state parameters of the battery and a third mapping relationship, wherein the third mapping relationship is used to characterize the correspondence between the state parameters of the battery and the first preset value.

[0011] In the above technical solution, the first preset value Binded to the battery's state parameters, when the first preset value Down-adjustment rate when state parameters change dynamically It also adapts to the battery status.

[0012] In one possible embodiment, the threshold for determining the cessation of charging demand current reduction is a first difference between an overcurrent fault threshold and a second preset value. The second preset value is determined based on the battery's state parameters and a fourth mapping relationship, which characterizes the correspondence between the battery's state parameters and the second preset value.

[0013] In the above technical solution, the threshold for stopping the reduction of charging demand current is strongly bound to the battery's state parameters. The threshold for stopping the reduction is dynamically determined based on the real-time state of the battery, avoiding the adaptability defects of fixed thresholds. This ensures that each action to stop the reduction is in line with the battery's current tolerance and charging demand, neither wasting the charging potential of the strong tolerance state nor exceeding the safety boundary of the weak tolerance state.

[0014] In one possible embodiment, the charging demand current adjustment condition includes an input current less than the charging demand current increase determination threshold and a duration greater than or equal to a third preset duration; the charging demand current adjustment stop condition includes an input current greater than or equal to the charging demand current increase determination threshold and a duration greater than or equal to a fourth preset duration.

[0015] In the above technical solution, the charging demand current adjustment condition is an upward adjustment condition, which is determined by both input current and duration. This effectively filters out instantaneous fluctuation interference, reduces the number of adjustments, protects the battery from frequent impacts, and ensures continuous and controllable charging process.

[0016] In one possible embodiment, determining the charging demand current increase threshold includes: determining the battery output current based on the vehicle's power consumption and the battery voltage; determining a second difference between the battery's charging demand current and output current; determining a third difference between the second difference and a third preset value; and using the third difference as the charging demand current increase threshold. The third preset value is determined based on the battery's state parameters and a fifth mapping relationship, wherein the fifth mapping relationship characterizes the correspondence between the battery's state parameters and the third preset value.

[0017] In the above technical solution, when determining the threshold for adjusting the charging demand current, the current consumption of the on-board devices is quantified by output current, and a safety redundancy is reserved by a third preset value to avoid current fluctuations exceeding the upper limit, ensuring that the adjustment action matches the actual power consumption of the vehicle. Furthermore, by binding the conditions for adjusting and stopping the charging demand current to the battery's state parameters, the adjustment and stopping of the charging demand current are matched with the real-time state of the battery.

[0018] In one possible embodiment, the battery's state parameters include the battery's current input current, state of charge (SOC), and temperature at the current moment.

[0019] Secondly, embodiments of this application provide a charging control device deployed in a vehicle, including a memory and a processor. The memory is used to store a computer program, and the processor is used to call the computer program to execute the above-described charging control method.

[0020] Thirdly, embodiments of this application provide a battery management system deployed in a vehicle and configured to perform the charging control method described above.

[0021] Fourthly, embodiments of this application provide a vehicle that includes the aforementioned charging control device or the aforementioned battery management system.

[0022] Therefore, the above-mentioned technical features of this application have the following beneficial effects: When the charging control method provided by this application determines that the vehicle battery meets the charging demand current reduction condition, it determines the reduction rate of the charging demand current based on the state parameters of the battery and the first mapping relationship, and adjusts the charging demand current of the battery based on the reduction rate. By strongly binding the reduction rate with the real-time state of the battery, the adaptability defect of the fixed reduction rate is solved, and the overcurrent control under different states is in line with the actual charging needs of the battery. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of this application or the background art, the accompanying drawings used in the embodiments of this application will be described below.

[0024] Figure 1 This is a schematic diagram of the structure of a charging control system disclosed in an embodiment of this application;

[0025] Figure 2 This is a schematic flowchart of a charging control method disclosed in an embodiment of this application;

[0026] Figure 3 This is a block diagram of a charging control device disclosed in an embodiment of this application.

[0027] Explanation of reference numerals in the attached figures:

[0028] 10-Charging control system, 100-Vehicle, 110-Battery, 120-Battery management system, 130-Charging control device, 131-Memory, 132-Processor, 200-Charging power supply. Detailed Implementation

[0029] The embodiments of this application will be described in further detail below with reference to the accompanying drawings and examples. The detailed description of the following embodiments and the accompanying drawings are used to illustrate the principles of this application by way of example, but should not be used to limit the scope of this application, that is, this application is not limited to the described embodiments.

[0030] In the description of this application, it should be noted that, unless otherwise stated, the terms "first," "second," etc., are used for descriptive purposes only and have no sequential or technical meaning, nor should they be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated.

[0031] Figure 1 A schematic diagram of the structure of a charging system disclosed in an embodiment of this application is shown.

[0032] like Figure 1 As shown, the charging control system 10 includes a vehicle 100 and a charging power supply 200, used to dynamically adapt the charging demand current adjustment rate to battery state parameters. Optionally, the vehicle can be, but is not limited to, a pure electric vehicle (PEV / BEV), a hybrid electric vehicle (HEV), a range-extended electric vehicle (REEV), a plug-in hybrid electric vehicle (PHEV), or a new energy vehicle.

[0033] Optionally, the vehicle 100 includes a battery 110, a battery management system 120, and a charging control device 130. Regarding the type of battery, the battery 110 can be any type, including but not limited to: lithium-ion batteries, lithium metal batteries, lithium-sulfur batteries, lead-acid batteries, nickel-metal hydride batteries, or lithium-air batteries, etc. Regarding the scale of the battery, the battery 100 in this embodiment can be a cell, a battery module, or a battery pack, wherein a battery module or battery pack can be formed by multiple batteries connected in series and parallel. In this embodiment, the specific type and scale of the battery 110 are not specifically limited.

[0034] The charging control device 130 is connected to the battery management system 120, and the battery management system 120 is connected to the battery 110. The connection can be wired or wireless, and this application embodiment does not limit the connection.

[0035] like Figure 3As shown, the charging control device 130 includes a memory 131 and a processor 132. The memory 131 is used to store computer programs, and the processor 132 is used to call the computer programs to execute the charging control method.

[0036] It should be noted that in the above-mentioned charging control system 10, the battery 110, the battery management system 120 and the charging control device 130 are deployed in the vehicle 100, and the charging power supply 200 is connected to the battery 110 of the vehicle 100 through the charging cable to charge the battery 110.

[0037] In addition, the charging control device 130 can be integrated into the battery management system 120 or set independently from the battery management system 120. In order to describe the interaction between the devices, this application embodiment takes the charging control device 130 and the battery management system 120 being set independently as an example to illustrate the charging control method provided in this application embodiment.

[0038] Specifically, the charging power supply 200 is a device for replenishing the electrical energy of the battery 110 in the vehicle 100. In this embodiment, the charging power supply 200 can be a fast-charging station, a charging station supporting vehicle-to-grid (V2G) mode, etc.

[0039] Optionally, the charging power supply 200 can be connected to the battery 110 via a wire and to the battery management system 120 via a communication line. The communication line is used to enable information exchange between the charging power supply 200 and the battery management system 120.

[0040] As an example, the communication line includes, but is not limited to, a Controller Area Network (CAN) communication bus or a daisy chain communication bus.

[0041] Optionally, in addition to communicating with the battery management system 120 via a communication line, the charging power supply 200 can also communicate with the battery management system 120 via a wireless network. This embodiment does not specifically limit the communication type between the charging power supply 200 and the battery management system 120.

[0042] To address battery overcurrent issues during charging, some existing technologies have developed overcurrent protection schemes, but these still have significant limitations: The rate at which the charging current demand decreases after an overcurrent occurs is often a fixed value, unrelated to the battery's real-time status, such as current state of charge (SOC) and temperature. When the battery is in a state with strong overcurrent tolerance, such as low SOC or normal temperature, the fixed decrease rate may be too slow to quickly contain the overcurrent risk, leading to persistent overcurrent effects. Conversely, when the battery is in a state with weak tolerance, such as high SOC or low temperature, the fixed decrease rate may be too fast, easily causing a sharp drop in charging efficiency or even impact damage to the battery, making it difficult to adapt to the actual tolerance requirements of power batteries under different conditions. Similarly, when the charging current demand is increased after the overcurrent is resolved, a fixed rate is often used, unrelated to core battery state parameters, and disconnected from the battery's tolerance and charging potential under different conditions.

[0043] Therefore, to address the aforementioned problem—the difficulty in adjusting the charging current demand rate to match the actual tolerance requirements of the power battery under different conditions—this application provides a charging control method.

[0044] Figure 2 This is a flowchart illustrating a charging control method disclosed in an embodiment of this application. In one embodiment, the charging control method can be applied to, for example... Figure 1 The charging control device 130 in the charging control system 10 shown. Hereinafter, the charging control method described above will be explained using an embodiment of this application as an example of the charging control method being applied to the charging control device 130.

[0045] like Figure 2 As shown in the figure, this application provides a charging control method, which includes: when the battery of a vehicle meets the charging demand current adjustment conditions, determining the adjustment rate of the charging demand current based on the state parameters of the battery and a first mapping relationship, wherein the first mapping relationship is used to characterize the correspondence between the state parameters of the battery and the adjustment rate of the charging demand current; adjusting the charging demand current of the battery based on the adjustment rate until the battery meets the charging demand current adjustment stop condition.

[0046] Specifically, when the vehicle's battery meets the corresponding charging current adjustment conditions, the adjustment rate of the charging current is first determined based on the battery's state parameters and a first mapping relationship. This first mapping relationship characterizes the correspondence between the battery's state parameters and the charging current adjustment rate. In other words, the adjustment rate is strongly bound to the battery's real-time state, solving the adaptability defects of fixed adjustment rates and ensuring that overcurrent control under different states conforms to the battery's actual charging needs. It should be noted that the first mapping relationship is pre-set by the charging control system's maintenance personnel in the charging control device based on the battery's charging tolerance characteristics under different state parameters, allowing for differentiated charging current adjustment rates.

[0047] Then, the charging control device adjusts the charging demand current of the battery based on the adjustment parameters, and sends the adjusted charging demand current to the charging power supply that charges the battery. The charging power supply adjusts its output current according to the adjusted charging demand current, so that the input current flowing to the battery decreases or increases, until the battery meets the charging demand current adjustment stop condition.

[0048] In one embodiment, the charging demand current adjustment condition includes an input current greater than or equal to an overcurrent fault threshold, and a duration greater than or equal to a first preset duration, wherein the input current is the current flowing into the battery; the overcurrent fault threshold is determined based on the battery's operating parameters at the current moment and a second mapping relationship, the second mapping relationship being used to characterize the correspondence between the battery's operating parameters and the overcurrent fault threshold, wherein the battery's operating parameters include battery SOC and battery temperature; the charging demand current adjustment stop condition includes an input current less than a charging demand current reduction stop judgment threshold, and a duration greater than or equal to a second preset duration. SOC is the abbreviation for State Of Charge, which means remaining battery capacity.

[0049] Specifically, the charging control device obtains the current flowing into the battery, i.e. the input current, as well as the battery's current SOC, temperature, and a second mapping relationship pre-set in the charging control device, through the battery management system.

[0050] Furthermore, the charging control device determines the relationship between the input current and the overcurrent fault threshold. When the input current is greater than or equal to the overcurrent fault threshold, timing begins, and after the timing duration exceeds a first preset duration, the adjustment rate of the charging demand current is determined based on the battery's state parameters and a first mapping relationship. This dual determination of input current and duration filters out instantaneous over-threshold interference, triggering a rate reduction only when the overcurrent state is stable and continuous, avoiding charging interruptions or efficiency losses caused by false triggering. Simultaneously, by reasonably setting the first preset duration, it ensures that the overcurrent response is not delayed, balancing anti-interference capability and timely response.

[0051] The key limitation of existing overcurrent protection schemes is that the rate of reduction is fixed, which makes it difficult to adapt to changes in battery state. For example, when the battery is in a low SOC (≤30%) and normal temperature (0℃~35℃) state, its overcurrent tolerance is strong, and a fixed rate of reduction may be too slow, resulting in residual overcurrent risk. When the battery is in a high SOC (>80%) and low temperature (<0℃) state, its tolerance is weak, and a fixed rate of reduction may be too fast, which can easily cause battery impact damage.

[0052] This embodiment determines the adjustment rate based on battery state parameters and a first mapping relationship. For example, the battery state parameters include the current flowing into the battery after exceeding the overcurrent fault threshold for a first preset time, as well as the battery's current state of charge (SOC) and temperature at the current moment. By strongly binding the adjustment rate to the battery's real-time state, the first mapping relationship can be pre-set with differentiated rates based on the battery's tolerance characteristics at different SOCs and temperatures (e.g., a faster rate corresponds to low SOC at room temperature, and a slower rate corresponds to high SOC at low temperature), thus solving the adaptability defects of a fixed adjustment rate.

[0053] Furthermore, while overcurrent fault thresholds in related technologies are mostly fixed values, the overcurrent tolerance of batteries varies significantly under different states of charge (SOC) and temperatures. When the battery is at low SOC and normal temperature, the cell activity is normal, the remaining capacity is sufficient, and the overcurrent tolerance is strong. If the overcurrent fault threshold is set too low, overcurrent protection will be triggered prematurely, limiting charging power and causing a significant decrease in charging efficiency. When the battery is at high SOC, low temperature, or high temperature, the cell activity decreases (low temperature) or the thermal risk increases (high temperature), and the electrode lithium insertion / extraction capability weakens (high SOC), significantly reducing the overcurrent tolerance. If the overcurrent fault threshold is set too high, the current exceeding the threshold will be large and last for a long time during overcurrent, exacerbating battery damage and even triggering thermal runaway.

[0054] The overcurrent fault threshold described in this embodiment is determined based on the battery's current SOC, temperature, and a second mapping relationship, which strongly binds the threshold to the battery's real-time state. The second mapping relationship can be pre-calibrated based on a large amount of battery test data, including the maximum safe overcurrent current under different SOC-temperature combinations. This addresses the adaptability shortcomings of fixed overcurrent thresholds, ensuring that the overcurrent fault threshold adheres to the battery's maximum safe tolerance boundary under any condition, neither wasting tolerance potential nor exceeding the safety limit.

[0055] For example, both the first preset duration and the second preset duration are set to 2 seconds.

[0056] In one embodiment, the first mapping relationship is In the formula, To reduce the rate, For input current, The overcurrent fault threshold, The first preset value is determined based on the state parameters of the battery and a third mapping relationship, wherein the third mapping relationship is used to characterize the correspondence between the state parameters of the battery and the first preset value.

[0057] In this embodiment, the first preset value Binded to the battery's state parameters, when the first preset value Down-adjustment rate when state parameters change dynamically It also adapts to the battery status.

[0058] Furthermore, the rate of reduction Also related to the current amplitude Relatedly, when the overcurrent amplitude is large, even the first preset value Fixed, reduced rate It will also automatically increase, which can quickly reduce the charging current demand; if state parameters are superimposed, such as the first preset value is determined in a high-temperature state. It becomes smaller, and thus the rate decreases. It will increase further, and its response efficiency is significantly better than the existing fixed rate reduction scheme.

[0059] Furthermore, the first preset value The dynamics avoid over-regulation. For example, when the overcurrent amplitude is small, if the battery is in a high SOC and low temperature state, the first preset value is determined. Larger, correspondingly, lowering the rate The current required for charging will be reduced slowly, thus eliminating the risk of overcurrent and preventing a sudden drop in charging efficiency due to excessively fast charging speed.

[0060] In one embodiment, the threshold for stopping the reduction of charging demand current is a first difference between an overcurrent fault threshold and a second preset value. The second preset value is determined based on the battery's state parameters and a fourth mapping relationship, which characterizes the correspondence between the battery's state parameters and the second preset value.

[0061] In this embodiment, the threshold for stopping the reduction of charging demand current is the first difference between the overcurrent fault threshold and the second preset value. The second preset value is determined based on battery state parameters and a third mapping relationship. This achieves dynamic adaptation of the threshold for stopping the reduction of charging demand current, avoiding the adaptability defects of a fixed threshold. It ensures that each action to stop the reduction matches the battery's current tolerance and charging demand, neither wasting the charging potential of a strong tolerance state nor exceeding the safety boundary of a weak tolerance state. The fourth mapping relationship can be preset based on battery characteristics.

[0062] In one embodiment, the charging demand current adjustment condition includes an input current less than a charging demand current increase determination threshold, and the duration of such increase is greater than or equal to a third preset duration; the charging demand current adjustment stop condition includes an input current greater than or equal to a charging demand current increase determination threshold, and the duration of such increase is greater than or equal to a fourth preset duration.

[0063] Specifically, the charging control device obtains the current flowing into the battery (i.e., the input current) and the charging demand current adjustment threshold through the battery management system, and determines the relationship between the input current and the charging demand current adjustment threshold. If the input current is less than the charging demand current adjustment threshold, timing begins, and after the timing duration exceeds a third preset duration, the charging demand current adjustment rate is determined based on the battery's state parameters and a first mapping relationship.

[0064] In this embodiment, the input current and duration are used for dual determination to filter out instantaneous over-threshold interference. The adjustment is only triggered when the overcurrent state is stable and continuous, avoiding charging interruption or efficiency loss caused by false triggering. At the same time, by reasonably setting the first preset duration, the overcurrent response is ensured to be not delayed, balancing anti-interference and response timeliness.

[0065] For example, the third preset duration and the fourth preset duration are set to 2 seconds.

[0066] In one embodiment, determining the charging demand current increase threshold includes: determining the battery output current based on the vehicle's power consumption and the battery voltage; determining a second difference between the battery's charging demand current and output current; determining a third difference between the second difference and a third preset value; and using the third difference as the charging demand current increase threshold. The third preset value is determined based on the battery's state parameters and a fifth mapping relationship, wherein the fifth mapping relationship characterizes the correspondence between the battery's state parameters and the third preset value.

[0067] Specifically, the calculation formula for the threshold for determining the increase in charging demand current is as follows: , In the formula, The threshold for determining when to increase the charging current requirement is set. The charging current demand at the current moment. For output current, This refers to the vehicle's power consumption. This refers to the battery voltage. This is the third preset value.

[0068] In this embodiment, when determining the threshold for adjusting the charging demand current, the current consumption of the on-board devices is quantified by outputting the current, and a safety redundancy is reserved using a third preset value to avoid current fluctuations exceeding the upper limit, ensuring that the adjustment action matches the actual power consumption of the vehicle. Furthermore, by binding the conditions for adjusting and stopping the charging demand current to the battery's state parameters, the adjustment and stopping of the charging demand current are matched to the real-time state of the battery.

[0069] In one embodiment, the state parameters of the battery include the battery's input current, state of charge (SOC), and temperature at the current moment.

[0070] The current input current of the battery is used as the basis for overcurrent judgment. By detecting in real time whether the input current has reached the overcurrent fault threshold, it is a direct signal to trigger the down-adjustment action. In addition, during the process of adjusting the charging demand current down or up, it is judged in real time whether the input current drops or rises to the target range to avoid blind adjustment.

[0071] Battery SOC reflects the remaining battery capacity and directly determines the overcurrent tolerance. At low SOC, there is sufficient space for lithium insertion / extraction in the electrodes, resulting in strong tolerance; at high SOC, there is insufficient space, resulting in weak tolerance.

[0072] When the battery temperature is at room temperature (0℃~35℃), the battery activity is normal and it has strong resistance to overcurrent and current fluctuations. When the temperature is low (<0℃), the battery activity decreases and lithium deposition is easily caused by a sudden increase in current. When the temperature is high (>35℃), the thermal risk increases and strict current control is required to avoid thermal runaway.

[0073] The above are merely specific embodiments of this application, but the scope of protection of this application is not limited thereto. Any changes or substitutions within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A charging control method, characterized in that, include: When the vehicle's battery meets the charging demand current adjustment conditions, the adjustment rate of the charging demand current is determined based on the battery's state parameters and a first mapping relationship. The first mapping relationship is used to characterize the correspondence between the battery's state parameters and the adjustment rate of the charging demand current. The charging current demand of the battery is adjusted based on the adjustment rate until the battery meets the charging current demand adjustment stop condition. The charging demand current adjustment conditions include an input current greater than or equal to an overcurrent fault threshold and a duration greater than or equal to a first preset duration, wherein the input current is the current flowing into the battery; The overcurrent fault threshold is determined based on the battery's operating parameters at the current moment and a second mapping relationship. The second mapping relationship is used to characterize the correspondence between the battery's operating parameters and the overcurrent fault threshold. The battery's operating parameters include the battery's SOC and battery temperature. The charging demand current adjustment stop condition includes the input current being less than the charging demand current reduction stop judgment threshold, and the duration being greater than or equal to the second preset duration. The first mapping relationship is a =( I in - I oc ) / k In the formula, a To reduce the rate, I in For input current, I oc The overcurrent fault threshold, k The first preset value is determined based on the state parameters of the battery and a third mapping relationship, wherein the third mapping relationship is used to characterize the correspondence between the state parameters of the battery and the first preset value. The threshold for stopping the reduction of charging demand current is the first difference between the overcurrent fault threshold and the second preset value. The second preset value is determined based on the battery's state parameters and the fourth mapping relationship. The fourth mapping relationship is used to characterize the correspondence between the battery's state parameters and the second preset value.

2. The charging control method according to claim 1, characterized in that: The charging demand current adjustment conditions include that the input current is less than the charging demand current adjustment threshold and the duration is greater than or equal to the third preset duration. The conditions for stopping the adjustment of the charging demand current include that the input current is greater than or equal to the threshold for determining the increase of the charging demand current, and the duration is greater than or equal to the fourth preset duration.

3. The charging control method according to claim 2, characterized in that: The determination of the charging demand current increase threshold includes: determining the output current of the battery based on the power consumption of the vehicle and the voltage of the battery; A second difference between the battery's charging demand current and output current is determined, and a third difference between the second difference and a third preset value is determined. The third difference is used as the threshold for determining the increase of the charging demand current. The third preset value is determined based on the battery's state parameters and the fifth mapping relationship, which is used to characterize the correspondence between the battery's state parameters and the third preset value.

4. The charging control method according to any one of claims 1 to 3, characterized in that: The battery's state parameters include the battery's input current, state of charge (SOC), and temperature at the current moment.

5. A charging control device, characterized in that: Deployed in a vehicle, the system includes a memory and a processor, the memory for storing a computer program and the processor for invoking the computer program to execute the charging control method as described in any one of claims 1 to 4.

6. A battery management system, characterized in that: Deployed in a vehicle, it is configured to perform the charging control method as described in any one of claims 1 to 4.

7. A vehicle, characterized in that, This includes the charging control device as described in claim 5, or the battery management system as described in claim 6.

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