Method, system and equipment for determining residual charging time under slow charging working condition and medium

Abstract

The invention belongs to the technical field of new energy automobiles, and particularly relates to a method, a system, equipment and a medium for determining residual charging time under a slow charging working condition, and the method comprises the following steps: monitoring a charging current in real time, processing an unexpected current working condition and an OBC capability change working condition, and accurately calculating and updating a maximum effective charging current. And correcting the maximum effective charging current by using the correction coefficient, and iteratively calculating the residual charging time in combination with the current SOC and the battery monomer temperature. According to the invention, the problem of charging remaining time estimation error caused by insufficient OBC output capability or Pack voltage rise is effectively solved, and the accuracy of charging time estimation and the user experience are improved. And meanwhile, the service life of the battery pack and the BMS is prolonged, and the method has positive significance on development of a new energy automobile charging technology.

Description

Technical Field

[0001] The present invention belongs to the technical field of new energy vehicles, and specifically relates to a method, system, device and medium for determining the remaining charging time under slow charging conditions. Background Art

[0002] In the field of new energy vehicles, the management and optimization of the slow charging process is crucial. Existing slow charging technologies usually rely on the output capacity of the on-board charger (OBC) and the monitoring of the charging process by the battery management system (BMS). During the charging process, the OBC outputs at a constant power, and as the battery pack voltage (Pack total voltage) increases, the output current gradually decreases. In order to estimate the remaining charging time, the system calculates based on the initial charging current and battery status. At the same time, the system also monitors the charging current in real time and performs average value filtering to identify unexpected current conditions, and updates the maximum effective charging current and the maximum output capacity of the OBC when necessary.

[0003] However, the existing technology has significant defects in processing the remaining charging time estimation. On the one hand, when the OBC output capacity is insufficient or there is a high-voltage load (such as vehicle load fluctuations), the system may not be able to accurately obtain the effective charging current, resulting in a large error in the remaining charging time estimation. On the other hand, due to the increase in the Pack voltage during the charging process, the OBC output current gradually decreases. If the current at the initial charging moment continues to be used to estimate the remaining time, the estimated time will be too short, affecting the user experience. In addition, the existing technology also has deficiencies in handling unexpected current conditions and OBC capacity change conditions, and may not be able to update the effective charging current in a timely and accurate manner, further exacerbating the error in the remaining charging time estimation. Summary of the invention

[0004] The purpose of the present invention is to provide a method, system, device and medium for determining the remaining charging time under slow charging conditions, so as to solve the problem of large error in estimating the remaining charging time due to the inability to accurately obtain and process the effective charging current during the slow charging process of new energy vehicles.

[0005] The present invention achieves the above-mentioned purpose through the following technical solutions: In a first aspect, the present invention provides a method for determining the remaining charging time under slow charging conditions, the method comprising: Monitor the charging current of the vehicle in slow charging conditions in real time, update the real-time maximum output current issued by the OBC to the initial maximum output current and record it; Determine the effective charging current based on the current consumption of the vehicle thermal management system acquired in real time; The calculated effective charging current is compared with the actual charging current. When the first judgment condition or the second judgment condition is met, the update flag is set, and the maximum effective charging current is updated according to the external load, the real-time maximum output current and the real-time charging current issued by the OBC; when the first judgment condition is met, the vehicle enters the unexpected current condition and outputs the maximum effective charging current under the condition; when the second judgment condition is met, the vehicle enters the OBC capacity change condition and outputs the maximum effective charging current under the condition; When the vehicle detects the update flag, the remaining charging time is recalculated using the corrected maximum effective charging current, the vehicle's current SOC, and the highest and lowest temperatures of the battery cells as initial conditions, and the displayed value is updated.

[0006] Furthermore, the real-time monitoring of the charging current of the vehicle under the slow charging condition is specifically: obtaining the real-time charging current of the vehicle, and performing average value filtering on the real-time charging current to obtain a filtered current value.

[0007] Furthermore, determining the effective charging current according to the current consumption of the vehicle thermal management system acquired in real time includes: Determine the current consumption of the thermal management system based on the real-time thermal management status of the BMS , when in heating state, calculated according to the resistance of the heating film ; When in cooling state, calculate according to the average power of the thermal management system during cooling ;in, Corresponding to the total pressure of the battery system, is the resistance of the heating film, PwrCoolSysAvrg The average working power when the thermal management system is working for cooling; Effective charging current ; in, is the maximum effective charging current, The allowable charging current is obtained by BMS based on the real-time battery cell temperature and SOC table. Current consumption for thermal management system, This is the current consumed by DCDC.

[0008] Furthermore, before the unexpected current condition is triggered, the real-time charging current With effective charging current When the first judgment condition is met, the vehicle enters the unexpected current operating condition, and the first judgment condition is specifically: (1) ; (2) Condition (1) is met continuously for more than 60 seconds; Under the unexpected current condition, update the maximum effective charging current , update the maximum output current recorded by BMS , set the update flag , clear the flag after 500ms.

[0009] Furthermore, when the real-time maximum output current emitted by the OBC satisfies the second judgment condition, the vehicle enters the OBC capacity change condition, and the second judgment condition is specifically: (1) or ; (2) ; (3) Conditions (1) and (2) are met continuously for more than 30 seconds; Under the OBC capability change condition, update the maximum effective charging current , set the update flag , clear the flag after 500ms; in The BMS allows charging current corresponding to the BMS lookup table based on the real-time SOC and the cell temperature of 25°C.

[0010] Furthermore, the method further includes: triggering the unexpected current condition multiple times when the maximum effective charging current meets the following conditions: ; This condition is met for more than 60 seconds; And multiple unexpected current recovery is possible when the maximum effective charging current meets the following conditions: ; This condition is met for more than 60 seconds.

[0011] Furthermore, the corrected maximum effective charging current is specifically: The correction coefficient P1 is obtained by looking up the linear difference table of the vehicle's current SOC data; Based on the current iteration The linear difference table is used to obtain the correction coefficient of the current maximum effective charging current ; Then the maximum effective charging current corrected in the iteration It is the maximum effective charging current corresponding to the current SOC data of the vehicle.

[0012] In a second aspect, the present invention proposes a system for determining the remaining charging time under slow charging conditions, which is applied to execute any of the above methods for determining the remaining charging time under slow charging conditions, and the system comprises: The current detection module is used to monitor the charging current of the vehicle in slow charging conditions in real time, and update the real-time maximum output current issued by the OBC to the initial maximum effective charging current; An effective current determination module, used to determine an effective charging current according to a current consumption of a vehicle thermal management system acquired in real time; A determination and updating module is used to compare and determine the calculated effective charging current with the actual charging current. When the first determination condition or the second determination condition is met, the update flag is set, and the maximum effective charging current is updated according to the external load, the real-time maximum output current, and the real-time charging current issued by the OBC; when the first determination condition is met, the vehicle enters an unexpected current condition and outputs the maximum effective charging current under the condition; when the second determination condition is met, the vehicle enters an OBC capacity change condition and outputs the maximum effective charging current under the condition; The calculation module calculates the remaining charging time and updates the displayed value based on the corrected maximum effective charging current, the current SOC of the vehicle and the highest and lowest temperatures of the battery cells as initial conditions when the vehicle detects the update flag.

[0013] In a third aspect, the present invention provides an electronic device, comprising: A processor; a memory for storing instructions executable by the processor; The processor is configured to execute the instructions to implement the method for determining the remaining charging time as described in any one of the above items.

[0014] In a fourth aspect, the present invention proposes a computer-readable storage medium. When the instructions in the computer-readable storage medium are executed by a processor of an electronic device, the electronic device can execute the method for determining the remaining charging time as described in any one of the above items.

[0015] The beneficial effects of the present invention are: The invention proposes a method for calculating the effective charging current of slow charging, which can more accurately determine the maximum effective charging current of new energy vehicles under slow charging conditions. This improvement optimizes the management of the charging process, especially when there are unexpected current conditions or changes in OBC output capacity, the maximum effective charging current can be updated in real time, thereby significantly improving the accuracy of the remaining charging time estimation.

[0016] The present invention also further improves the accuracy of the maximum effective charging current by introducing correction coefficient tables and iterative calculation methods, ensuring reliable estimation of the remaining charging time under different SOC and thermal management modes. This not only improves the user experience and reduces the inconvenience caused by charging time errors, but also helps to extend the service life of the battery pack and BMS system, and has a positive role in promoting the development of charging technology in the new energy vehicle industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1A flow chart of a method for determining the remaining charging time under slow charging conditions provided in an embodiment of the present application; Figure 2 A schematic diagram of another flow chart of a method for determining the remaining charging time under slow charging conditions provided in an embodiment of the present application; Figure 3 A software architecture diagram of the remaining charging time in the method for determining the remaining charging time under slow charging conditions provided in an embodiment of the present application. DETAILED DESCRIPTION

[0018] The present application is further described in detail below in conjunction with the accompanying drawings. It is necessary to point out here that the following specific implementation methods are only used to further illustrate the present application and cannot be understood as limiting the scope of protection of the present application. Technical personnel in this field can make some non-essential improvements and adjustments to the present application based on the above application content.

[0019] Example 1

[0020] like Figure 1-3 As shown, this embodiment proposes a method for determining the remaining charging time under slow charging conditions, the method comprising: real-time monitoring of the charging current of the vehicle under slow charging conditions, obtaining the real-time charging current of the vehicle, and filtering the real-time charging current by an average value within 30 seconds to obtain a filtered current value; when initially entering the charging state, The real-time maximum output current issued is updated to the initial maximum effective charging current , and record the initial OBC maximum output current ; Determine the effective charging current based on the vehicle thermal management system consumption current obtained in real time ; The calculated effective charging current Compare with the actual charging current, and when the first judgment condition or the second judgment condition is met, the update flag is set, and the maximum effective charging current is updated according to the external load, the real-time maximum output current sent by the OBC, and the real-time charging current. ; When the first judgment condition is met, the vehicle enters an unexpected current condition and outputs the maximum effective charging current under this condition. When the second judgment condition is met, the vehicle enters an OBC capacity change condition and outputs the maximum effective charging current under this condition. When the vehicle detects the update flag, the remaining charging time is recalculated with the corrected maximum effective charging current, the vehicle's current SOC and the highest and lowest temperatures of the battery cells as initial conditions, and the displayed value is updated.

[0021] The above scheme includes real-time monitoring and initial settings: First, the charging current of the vehicle under slow charging conditions is monitored in real time through the on-board sensor, and The real-time maximum output current of the on-board charger is set as the initial maximum output current. This step ensures that the system can obtain key data during the charging process in real time. It also includes the determination of the effective charging current: Then, based on the current consumption of the vehicle thermal management system obtained in real time, this part of the consumption is deducted from the initial maximum charging current. , and obtain the effective charging current.

[0022] This step takes into account the additional load that may exist in the vehicle during the actual charging process, thereby improving the accuracy of the charging current calculation. DCDC converts the high voltage electricity of the battery system into 12V lead-acid electricity for the entire vehicle to replenish the low-voltage lead-acid battery. The power supply for various electronic and electrical equipment such as the ECU central control in the entire vehicle is 12V lead-acid electricity.

[0023] Further preferably, determining the effective charging current according to the vehicle thermal management system consumption current acquired in real time includes: determining the thermal management system consumption current according to the BMS real-time thermal management state , when in heating state, calculated according to the resistance of the heating film ; When in cooling state, calculate according to the average power of the thermal management system during cooling ;in, Corresponding to the total pressure of the battery system, Res is the resistance of the heating film, and PwrCoolSysAvrg is the average working power of the thermal management system when it is working in cooling mode. When the heating film is used for heating, the heating film is similar to a pure resistor, and the current when the heating film is working is the ratio of the two. The current consumed when the thermal management is working in cooling mode is calculated as average power / working voltage. Effective charging current ;in is the maximum effective charging current, The allowable charging current is obtained by BMS based on the real-time battery cell temperature and SOC table. Current consumption for thermal management system, This is the current consumed by DCDC.

[0024] Further preferably, before the unexpected current condition is triggered, the real-time charging current With effective charging current When the first judgment condition is met, the vehicle enters an unexpected current condition. The first judgment condition is specifically: (1) ; (2) Condition (1) is met continuously for more than 60 seconds; Update the maximum effective charging current under unexpected current conditions , update the maximum output current recorded by BMS , set the update flag , clear the flag after 500ms.

[0025] Understandably, is the maximum effective charging current when no unexpected current condition is triggered , it is considered that the maximum output current of OBC is equal to the maximum effective charging current. When the abnormal working condition is triggered, the maximum effective charging current Updated based on external load, real-time maximum output current and real-time charging current from OBC.

[0026] When the real-time maximum output current of the OBC meets the second judgment condition, the vehicle enters the OBC capacity change condition. The second judgment condition is specifically: (1) or ; (2) ; (3) Conditions (1) and (2) are met continuously for more than 30 seconds; Update the maximum effective charging current when the OBC capability changes , set the update flag , clear the flag after 500ms; in The BMS allows charging current corresponding to the BMS lookup table based on the real-time SOC and the cell temperature of 25°C.

[0027] It can be understood that the above scheme includes the setting and updating of the discrimination conditions: the present invention sets two discrimination conditions, namely the first discrimination condition (entering the vehicle unexpected current operating condition) and the second discrimination condition (entering the vehicle OBC capability change operating condition).

[0028] When the real-time charging current With effective charging current When any of the judgment conditions is met, the system will set the update flag and update the maximum effective charging current. This step enables the system to adapt to various changes in the charging process in real time and ensure the accuracy of the remaining charging time estimation.

[0029] In specific implementation, the realization of the discrimination conditions includes: the first discrimination condition can be realized by monitoring the switch status and current consumption of the vehicle thermal management system, air conditioner and other loads; the second discrimination condition can be realized by monitoring the changes in the output power, voltage and current of the OBC and other parameters. When these parameters reach the preset threshold, the discrimination condition can be triggered.

[0030] Further preferably, the method further includes: triggering the unexpected current condition multiple times when the maximum effective charging current meets the following conditions: ; This condition is met for more than 60 seconds; And multiple unexpected current recovery is possible when the maximum effective charging current meets the following conditions: ; This condition is met for more than 60 seconds.

[0031] The re-entry of the unexpected current condition in the above scheme includes: When the real-time charging current With effective charging current When the difference continues to meet certain conditions for more than 60 seconds, the system will enter the unexpected current condition again. The system will detect this condition in real time. Once it is met, it will immediately update the maximum effective charging current and record the new value of the real-time maximum output current issued by the OBC. At the same time, the system sets the update flag and clears the flag after 500 milliseconds to prepare for the next trigger or recovery.

[0032] Recovery from unexpected current conditions includes: When the real-time charging current With effective charging current When the difference no longer meets the above trigger conditions and continues to fail to meet the conditions for more than 60 seconds, the system will trigger the recovery of the unexpected current condition.

[0033] During the recovery process, the system will also update the maximum effective charging current and record the new value of the real-time maximum output current issued by the OBC.

[0034] The process of setting and clearing the update flag is the same as that of triggering an unexpected current condition.

[0035] It is understandable that, in this embodiment, through the re-triggering and recovery mechanism of unexpected current conditions, the system can adjust the maximum effective charging current in real time to adapt to various changes in the charging process, thereby improving the accuracy and stability of charging. This mechanism also helps to avoid the problem of error in estimating the remaining charging time due to insufficient OBC output capacity or increased Pack voltage, further improving the user experience. In addition, by updating parameters such as the real-time maximum output current and maximum effective charging current issued by the OBC in real time, the system can better protect the battery pack and BMS system and extend its service life.

[0036] During slow charging, OBC outputs constant power. When the SOC is low at the beginning of charging, the charging current is high when the pack voltage is low. As the SOC increases, the charging current gradually decreases. In order to obtain accurate effective charging current, the output of unexpected current conditions and OBC capacity change conditions is corrected.

[0037] The maximum effective charging current correction factor table is calculated. The correction factor under different SOC is obtained based on the ratio of the measured SOC=0 to full charge data and the rated voltage of the battery pack, as shown in Table 1.

[0038] Table 1. Relationship between SOC change and slow charge current correction factor ; Further preferably, the corrected effective charging current is specifically: The correction coefficient P1 is obtained by looking up the linear difference table of the vehicle's current SOC data; Based on the current iteration The linear difference table is used to obtain the correction factor of the current maximum effective charging current ; Then the maximum effective charging current corrected in the iteration is , It is the maximum effective charging current corresponding to the current SOC data of the vehicle.

[0039] In the above scheme, the calculation and update of the remaining charging time include: when the vehicle detects the update flag, the system will use the corrected maximum effective charging current, the vehicle's current SOC (State of Charge) and the highest and lowest temperatures of the battery cells as initial conditions, calculate the remaining charging time through a preset algorithm, and update the displayed value. This step ensures that users can obtain accurate information on the remaining charging time in real time.

[0040] In specific implementation, the remaining charging time calculation algorithm can be designed based on factors such as the charging characteristics of the battery, the relationship between SOC and charging current, and the effect of temperature on charging rate. A relatively accurate remaining charging time estimation value can be obtained through iterative calculation or table lookup.

[0041] For example, based on the above scheme, the specific actual vehicle working condition data is shown in Table 2. The following examples are deleted from the actual vehicle working conditions to facilitate understanding of the strategy content of the above scheme. It should be noted that all examples are defaulted to: (The thermal management system of the vehicle is not turned on, and the DCDC load consumption current is 0.2A). The rated capacity of the battery system is 120Ah, and the charging starting SOC is 0%.

[0042] Table 2. Actual vehicle operating conditions data ; ; Explanation of the meaning of variables in Table 2: Time : Charging time, starting from the moment charging begins; iOBCMaxCurr : Real-time maximum output current from OBC; Actual effective charging current; : Maximum effective charging current (software internal variable, before triggering unexpected current conditions iOBCMaxCurr Equal, triggering unexpected current conditions and updating according to the strategy); iOBCMaxCurr_L: The recorded real-time maximum output current from the OBC (updated each time an unexpected current condition is triggered or the OBC output capacity changes).

[0043] In actual applications, when the above-mentioned strategy is not implemented, the remaining charging time is calculated using 20A as the maximum effective charging current estimated time, which is approximately 120 / 20=6h; after the implementation of this strategy, the remaining charging time is calculated using 16A as the maximum effective charging current estimated time, which is approximately 120 / 16=7.5h, reducing the error by 1.5h; when the charging current is smaller, the error will be greater (for example, a 3.3kw charging pile and a 1.5kw on-board charging).

[0044] According to Table 2 above, it can be seen that this strategy can accurately identify the effective charging current changes in the actual charging process, and update the maximum effective charging current by judging the changes in the effective charging current. iPileCurr The ultimate goal is to obtain the accurate maximum effective charging current and then update the remaining charging time to avoid various unexpected working conditions affecting the accuracy of the remaining charging time estimation, thereby improving the user experience.

[0045] Based on the same inventive concept, this embodiment further proposes a system for determining the remaining charging time under slow charging conditions, which is applied to execute the method for determining the remaining charging time under slow charging conditions as described above, and the system includes: The current detection module is used to monitor the charging current of the vehicle in slow charging conditions in real time, and update the real-time maximum output current issued by the OBC to the initial maximum effective charging current; An effective current determination module, used to determine an effective charging current according to a current consumption of a vehicle thermal management system acquired in real time; The judgment and update module is used to compare and judge the calculated effective charging current with the actual charging current. When the first judgment condition or the second judgment condition is met, the update flag is set, and the maximum effective charging current is updated according to the external load, the real-time maximum output current and the real-time charging current issued by the OBC; when the first judgment condition is met, the vehicle enters the unexpected current working condition and outputs the maximum effective charging current under the working condition; when the second judgment condition is met, the vehicle enters the OBC capacity change working condition and outputs the maximum effective charging current under the working condition; The calculation module calculates the remaining charging time and updates the displayed value based on the corrected maximum effective charging current, the current SOC of the vehicle, and the highest and lowest temperatures of the battery cells as initial conditions when the vehicle detects the update flag.

[0046] It should be noted here that each module in the above-mentioned determination system corresponds to each step in implementing the above-mentioned determination method, and the instances and application scenarios implemented by multiple modules and corresponding steps are the same, but are not limited to the contents disclosed in the above-mentioned embodiment 1.

[0047] This embodiment further provides an electronic device, including: a processor; a memory for storing instructions executable by the processor; The processor is configured to execute instructions to implement the method for determining the remaining charging time as described above.

[0048] This embodiment further proposes a computer-readable storage medium. When instructions in the computer-readable storage medium are executed by a processor of an electronic device, the electronic device can execute the method for determining the remaining charging time as described above.

[0049] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0050] In addition, each functional module in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0051] The above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit it. Although the present application has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments can still be modified, or some of the technical features can be replaced by equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A method for determining the remaining charging time under slow charging conditions, characterized in that: The method comprises: Monitor the charging current of the vehicle under slow charging conditions in real time, update the real-time maximum output current issued by the OBC to the initial maximum effective charging current, and record the initial OBC maximum output current; Determine the effective charging current based on the current consumption of the vehicle thermal management system acquired in real time; The calculated effective charging current is compared with the actual charging current. When the first judgment condition or the second judgment condition is met, the update flag is set, and the maximum effective charging current is updated according to the external load, the real-time maximum output current and the real-time charging current issued by the OBC; when the first judgment condition is met, the vehicle enters the unexpected current condition and outputs the maximum effective charging current under the condition; when the second judgment condition is met, the vehicle enters the OBC capacity change condition and outputs the maximum effective charging current under the condition; When the vehicle detects the update flag, the remaining charging time is recalculated using the corrected maximum effective charging current, the vehicle's current SOC, and the highest and lowest temperatures of the battery cells as initial conditions, and the displayed value is updated.

2. The method for determining the remaining charging time under slow charging conditions according to claim 1, characterized in that: The real-time monitoring of the charging current of the vehicle under the slow charging condition specifically includes: obtaining the real-time charging current of the vehicle, and performing average value filtering on the real-time charging current to obtain a filtered current value.

3. The method for determining the remaining charging time under slow charging conditions according to claim 1, characterized in that: The determining of the effective charging current according to the current consumption of the vehicle thermal management system acquired in real time includes: Determine the current consumption of the thermal management system based on the real-time thermal management status of the BMS , when in heating state, calculated according to the resistance of the heating film ; When in cooling state, calculate according to the average power of the thermal management system during cooling ;in, Corresponding to the total pressure of the battery system, Res is the resistance of the heating film, PwrCoolSysAvrg The average working power when the thermal management system is working for cooling; Effective charging current ; in, is the maximum effective charging current, The allowable charging current is obtained by BMS based on the real-time battery cell temperature and SOC table. Current consumption for thermal management system, This is the current consumed by DCDC.

4. The method for determining the remaining charging time under slow charging conditions according to claim 3, characterized in that: Before the unexpected current condition is triggered, the real-time charging current With effective charging current When the first judgment condition is met, the vehicle enters the unexpected current operating condition, and the first judgment condition is specifically: （1） ； (2) Condition (1) is met continuously for more than 60 seconds; Under the unexpected current condition, update the maximum effective charging current , update the maximum output current recorded by BMS , set the update flag , clear the flag after 500ms.

5. The method for determining the remaining charging time under slow charging conditions according to claim 3, characterized in that: When the real-time maximum output current emitted by the OBC satisfies the second judgment condition, the vehicle enters the OBC capability change condition, and the second judgment condition is specifically: (1) or ; （2） ； (3) Conditions (1) and (2) are met continuously for more than 30 seconds; Under the OBC capability change condition, update the maximum effective charging current , set the update flag , clear the flag after 500ms; in The BMS allows charging current corresponding to the BMS lookup table based on the real-time SOC and the cell temperature of 25°C.

6. The method for determining the remaining charging time under slow charging conditions according to claim 4, characterized in that: The method further includes: triggering the unexpected current operating condition multiple times when the maximum effective charging current meets the following conditions: or ; This condition is met for more than 60 seconds; And multiple unexpected current recovery is possible when the maximum effective charging current meets the following conditions: ; This condition is met for more than 60 seconds.

7. The method for determining the remaining charging time under slow charging conditions according to claim 3, characterized in that: The corrected maximum effective charging current is specifically: The correction coefficient P1 is obtained by looking up the linear difference table of the vehicle's current SOC data; Based on the current iteration The linear difference table is used to obtain the correction coefficient of the current maximum effective charging current ; Then the maximum effective charging current corrected in the iteration It is the maximum effective charging current corresponding to the current SOC data of the vehicle.

8. A system for determining the remaining charging time under slow charging conditions, applied to execute the method for determining the remaining charging time under slow charging conditions according to any one of claims 1 to 7, characterized in that: The system comprises: The current detection module is used to monitor the charging current of the vehicle in slow charging conditions in real time, and update the real-time maximum output current issued by the OBC to the initial maximum effective charging current; An effective current determination module, used to determine an effective charging current according to a current consumption of a vehicle thermal management system acquired in real time; A determination and updating module is used to compare and determine the calculated effective charging current with the actual charging current. When the first determination condition or the second determination condition is met, the update flag is set, and the maximum effective charging current is updated according to the external load, the real-time maximum output current, and the real-time charging current issued by the OBC; when the first determination condition is met, the vehicle enters an unexpected current condition and outputs the maximum effective charging current under the condition; when the second determination condition is met, the vehicle enters an OBC capacity change condition and outputs the maximum effective charging current under the condition; The calculation module calculates the remaining charging time and updates the displayed value based on the corrected maximum effective charging current, the current SOC of the vehicle and the highest and lowest temperatures of the battery cells as initial conditions when the vehicle detects the update flag.

9. An electronic device, characterized in that: include: processor; a memory for storing instructions executable by the processor; The processor is configured to execute the instructions to implement the method for determining the remaining charging time according to any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that: When the instructions in the computer-readable storage medium are executed by a processor of an electronic device, the electronic device is enabled to execute the method for determining the remaining charging time as claimed in any one of claims 1 to 7.

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