A method, system, device and medium for determining the remaining charging time under slow charging conditions

Abstract

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. The method accurately calculates and updates the maximum effective charging current by monitoring the charging current in real time and processing unexpected current conditions and OBC capacity change conditions. The maximum effective charging current is corrected using a correction factor, and the remaining charging time is iteratively calculated in combination with the current SOC and the battery cell temperature. The present invention effectively solves the problem of estimation errors in the remaining charging time caused by insufficient OBC output capacity or increased Pack voltage, improves the accuracy of charging time estimation and the user experience. At the same time, the present invention also extends the service life of the battery pack and the BMS system, which has positive significance for the development of new energy vehicle charging technology.

Description

Technical Field

[0001] The present invention belongs to the technical field of new energy vehicles, and particularly 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 are 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. As the battery pack voltage (total Pack voltage) increases, the output current gradually decreases. To estimate the remaining charging time, the system calculates based on the initial charging current and the battery state. 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 update the maximum effective charging current and the maximum output capacity of the OBC when necessary.

[0003] However, the existing technologies have significant defects in dealing with the estimation of the remaining charging time. On the one hand, when the output capacity of the OBC is insufficient or there are high-voltage loads (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 estimation of the remaining charging time. On the other hand, due to the increase in the Pack voltage during the charging process, the output current of the OBC gradually decreases. If the current at the initial charging moment is still used to estimate the remaining time, the estimated time will be too small, affecting the user experience. In addition, the existing technologies also have deficiencies in dealing with 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 estimation of the remaining charging time. Summary of the Invention

[0004] The object 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 errors in the estimation of the remaining charging time caused by 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 object through the following technical solutions:

[0006] In the first aspect, the present invention proposes a method for determining the remaining charging time under slow charging conditions, the method includes;

[0007] Real-time monitor the charging current of the vehicle under slow charging conditions, update the real-time maximum output current issued by the OBC to the initial maximum output current and record it;

[0008] Determine the effective charging current according to the current consumed by the vehicle thermal management system obtained in real time;

[0009] Compare the calculated effective charging current with the actual charging current. When the first discrimination condition or the second discrimination condition is met, set the update flag bit, and update the maximum effective charging current according to the external load, the real-time maximum output current and the real-time charging current sent by the OBC; when the first discrimination condition is met, the vehicle enters the unexpected current working condition and outputs the maximum effective charging current under this working condition. When the second discrimination condition is met, the vehicle enters the OBC capacity change working condition and outputs the maximum effective charging current under this working condition;

[0010] When the vehicle detects the update flag bit, recalculate the remaining charging time with the corrected maximum effective charging current, the current SOC of the vehicle, and the highest and lowest temperatures of the battery cells as the initial conditions, and update the display value.

[0011] Further, the real-time monitoring of the charging current of the vehicle under the slow charging condition is specifically: obtain the real-time charging current of the vehicle, and perform average value filtering processing on the real-time charging current to obtain the filtered current value.

[0012] Further, the determination of the effective charging current according to the current consumed by the vehicle thermal management system obtained in real time includes:

[0013] Determine the current consumed by the thermal management system according to the real-time thermal management state of the BMS iTsmCurr , when in the heating state, calculate according to the resistance value of the heating film ; when in the cooling state, calculate according to the average power of the thermal management system during refrigeration ; where uPackVolt corresponds to the total voltage of the battery system, Res is the resistance value of the heating film, PwrCoolSysAvrg is the average working power of the thermal management system during refrigeration;

[0014] When in the cooling state, calculate according to the average power of the thermal management system during refrigeration ; where uPackVolt corresponds to the total voltage of the battery system, Res is the resistance value of the heating film, PwrCoolSysAvrg is the average working power of the thermal management system during refrigeration;

[0015] Effective charging current ;

[0016] where is the maximum effective charging current, is the allowable charging current obtained by the BMS by looking up the table according to the real-time cell temperature and SOC, is the current consumed by the thermal management system, iDcDcCurr is the current consumed by the DCDC.

[0017] Further, before the unexpected current condition is triggered, the real-time charging current and the effective charging current meet the first discrimination condition, and the vehicle enters the unexpected current condition. The first discrimination condition is specifically:

[0018] (1) > 3A or >[[]] ;

[0019] (2) Condition (1) is continuously satisfied for more than 60 seconds;

[0020] Under the unexpected current condition, update the maximum effective charging current , update the maximum output current recorded by the BMS , set the update flag bit , and clear the flag bit after 500 ms.

[0021] Further, when the real-time maximum output current issued by the OBC meets the second discrimination condition, the vehicle enters the OBC capacity change condition. The second discrimination condition is specifically:

[0022] (1) or ;

[0023] (2) ;

[0024] (3) Conditions (1) and (2) are continuously satisfied for more than 30 s;

[0025] Under the OBC capacity change condition, update the maximum effective charging current , set the update flag bit , and clear the flag bit after 500 ms;

[0026] Where is the BMS allowed charging current corresponding to the real-time SOC and the monomer temperature of 25 °C according to the BMS look-up table.

[0027] Further, the method further includes: when the maximum effective charging current meets the following conditions, the unexpected current condition can be triggered multiple times: > or > ;

[0028] This condition is continuously satisfied for more than 60 s;

[0029] And when the maximum effective charging current meets the following conditions, the unexpected current can be restored multiple times: > A or > ; This condition is continuously satisfied for more than 60 s.

[0030] Further, the corrected maximum effective charging current is specifically:

[0031] The correction coefficient P1 is obtained by linearly interpolating and looking up a table based on the current SOC data of the vehicle;

[0032] According to the current iteration The correction coefficient of the current maximum effective charging current is obtained by linearly interpolating and looking up a table ; Then, the corrected maximum effective charging current in the iteration = *P1 / is the maximum effective charging current corresponding to the current SOC data of the vehicle.

[0033] In a second aspect, the present invention provides a system for determining the remaining charging time under a slow charging condition, which is applied to the method for determining the remaining charging time under a slow charging condition described in any one of the above, and the system includes:

[0034] A current detection module, configured to monitor the charging current of the vehicle in real time under a slow charging condition, and update the real-time maximum output current sent by the OBC to the initial maximum effective charging current;

[0035] An effective current determination module, configured to determine the effective charging current according to the current consumed by the vehicle thermal management system obtained in real time;

[0036] A discrimination and update module, configured to compare and judge the calculated effective charging current with the actual charging current. When the first discrimination condition or the second discrimination condition is satisfied, the update flag bit 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 discrimination condition is satisfied, the vehicle enters an unexpected current condition and outputs the maximum effective charging current under this condition, and when the second discrimination condition is satisfied, the vehicle enters an OBC capacity change condition and outputs the maximum effective charging current under this condition;

[0037] A calculation module, when the vehicle detects the update flag bit, calculates the remaining charging time with 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, and updates the display value.

[0038] In a third aspect, the present invention provides an electronic device, including:

[0039] A processor; a memory for storing instructions executable by the processor;

[0040] Wherein, 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.

[0041] In a fourth aspect, the present invention provides 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.

[0042] The beneficial effects of the present invention are as follows:

[0043] 1. A method for calculating the effective charging current of slow charging proposed by the present invention enables new energy vehicles to more accurately determine the maximum effective charging current under slow charging conditions. This improvement optimizes the management of the charging process. Especially in the presence of unexpected current conditions or changes in the output capacity of the OBC, the maximum effective charging current can be updated in real time, thus significantly improving the accuracy of the estimated remaining charging time.

[0044] 2. The present invention also further improves the accuracy of the maximum effective charging current by introducing methods such as a correction coefficient table and iterative calculation, 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 the BMS system, and has a positive promoting effect on the development of charging technology in the new energy vehicle industry. Description of the Drawings

[0045] Figure 1 It is a schematic flowchart of a method for determining the remaining charging time under slow charging conditions provided by an embodiment of the present application;

[0046] Figure 2 It is another schematic flowchart of a method for determining the remaining charging time under slow charging conditions provided by an embodiment of the present application;

[0047] Figure 3 It is a software architecture diagram of the remaining charging time in the method for determining the remaining charging time under slow charging conditions provided by an embodiment of the present application. Detailed Embodiments

[0048] The following further describes the present application in detail with reference to the drawings. It is necessary to point out here that the following specific embodiments are only used to further illustrate the present application and should not be construed as limiting the protection scope of the present application. Those skilled in the art can make some non-essential improvements and adjustments to the present application according to the above application content.

[0049] Embodiment 1

[0050] As Figures 1 - 3 shown, this embodiment proposes a method for determining the remaining charging time under slow charging conditions. The method includes: real-time monitoring of the charging current of the vehicle under slow charging conditions, obtaining the real-time charging current of the vehicle, and performing an average value filtering process on the real-time charging current within 30 seconds to obtain the filtered current value; when initially entering the charging state, update the real-time maximum output current issued by the OBC (On-Board Charger) to the initial maximum effective charging current ( ), and record the initial OBC maximum output current ( = ); determine the effective charging current according to the current consumed by the vehicle thermal management system obtained in real time ; compare the calculated effective charging current with the actual charging current. When the first discrimination condition or the second discrimination condition is met, set the update flag bit, and update the maximum effective charging current according to the external load, the real-time maximum output current issued by the OBC, and the real-time charging current ; when the first discrimination condition is met, the vehicle enters the unexpected current condition and outputs the maximum effective charging current under this condition. When the second discrimination condition is met, the vehicle enters the OBC capacity change condition and outputs the maximum effective charging current under this condition; when the vehicle detects the update flag bit, recalculate the remaining charging time with the corrected maximum effective charging current, the current SOC of the vehicle, and the highest and lowest temperatures of the battery cells as the initial conditions, and update the display value.

[0051] In the above solution, it includes real-time monitoring and initial setting: First, the charging current of the vehicle under slow charging conditions is real-time monitored through in-vehicle sensors, and the real-time maximum output current of the OBC (On-Board Charger) is set as the initial maximum output current. This step ensures that the system can obtain the key data during the charging process in real time. It also includes the determination of the effective charging current: Then, according to the current consumed by the vehicle thermal management system obtained in real time, subtract this part of the consumption (the current consumed by the thermal management system iTsmCurr and the DCDC consumed current iDcDcCurr ) from the initial maximum charging current to obtain the effective charging current. This step takes into account the possible additional loads during the actual charging process of the vehicle, thereby improving the accuracy of the charging current calculation. The DCDC converts the high-voltage electricity of the battery system into 12V lead-acid electricity for the whole vehicle to supplement the low-voltage lead-acid battery. The power supply for various electronic and electrical devices such as the ECU in the whole vehicle is 12V lead-acid electricity.

[0052] Further preferably, determining the effective charging current according to the current consumed by the vehicle thermal management system obtained in real time includes: determining the current iTsmCurr consumed by the thermal management system according to the real-time thermal management status of the BMS. When in the heating state, calculating according to the resistance value of the heating film ; when in the cooling state, calculating according to the average power of the thermal management system during refrigeration ; where uPackVolt corresponds to the total voltage of the battery system, Res is the resistance value of the heating film, and PwrCoolSysAvrg is the average working power of the thermal management system during refrigeration; when heating with the heating film, the heating film is similar to a pure resistor, and the current when the heating film works is the ratio of the two; calculating the current consumed during the refrigeration operation of the thermal management is the average power / working voltage. The effective charging current ; where is the maximum effective charging current, is the allowable charging current obtained by the BMS by looking up the table according to the real-time cell temperature and SOC, is the current consumed by the thermal management system, and iDcDcCurr is the current consumed by DCDC.

[0053] Further preferably, before the unexpected current condition is triggered, the real-time charging current and the effective charging current satisfy the first discrimination condition, and the vehicle enters the unexpected current condition. The first discrimination condition is specifically:

[0054] (1) > 3A (ampere) or > ;

[0055] (2) Condition (1) is continuously satisfied for more than 60 seconds;

[0056] Under the unexpected current condition, update the maximum effective charging current , update the maximum output current recorded by the BMS, set the update flag bit , and clear the flag bit after 500 ms.

[0057] It can be understood that iPileCurr is the maximum effective charging current. Before the unexpected current condition is triggered iPileCurr = iOBCMaxCurr , it is considered that the maximum output current of the OBC is equal to the maximum effective charging current. After the abnormal condition is triggered, the maximum effective charging current iPileCurr is updated according to the external load, the real-time maximum output current issued by the OBC, and the real-time charging current.

[0058] When the real-time maximum output current sent by the OBC meets the second discrimination condition, the vehicle enters the OBC capacity change working condition. The specific second discrimination condition is as follows:

[0059] (1) or ;

[0060] (2) ;

[0061] (3) Conditions (1) and (2) are continuously satisfied for more than 30 s;

[0062] Under the OBC capacity change working condition, update the maximum effective charging current , set the update flag bit , and clear the flag bit after 500 ms;

[0063] where is the BMS allowed charging current corresponding to the real-time SOC and the single-cell temperature of 25 °C looked up in the table by the BMS.

[0064] It can be understood that the above scheme includes the setting and update of the discrimination conditions: The present invention sets two discrimination conditions, namely the first discrimination condition (entering the vehicle unexpected current working condition) and the second discrimination condition (entering the vehicle OBC capacity change working condition). When the real-time charging current and the effective charging current meet any one of the discrimination conditions, the system will set the update flag bit 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 ensures the accuracy of the estimated remaining charging time.

[0065] Specifically in implementation, the realization of the discrimination conditions includes: The first discrimination condition can be realized by monitoring the switching states and current consumption of loads such as the vehicle thermal management system and the air conditioner; the second discrimination condition can be realized by monitoring the changes in parameters such as the output power, voltage, and current of the OBC. When these parameters reach the preset thresholds, the discrimination conditions can be triggered.

[0066] Further preferably, the method further includes: When the maximum effective charging current meets the following conditions, the unexpected current working condition can be triggered multiple times: > A or > ; This condition is continuously satisfied for more than 60 s;

[0067] And when the maximum effective charging current meets the following conditions, the unexpected current can be restored multiple times: > or > ; This condition continues to be satisfied for more than 60 s.

[0068] The re - entry of the unexpected current condition in the above - mentioned solution includes:

[0069] When the real - time charging current Iact and the effective charging current The difference between them continues to satisfy a certain condition for more than 60 seconds, the system will re - enter the unexpected current condition. The system will detect this condition in real - time. Once it is satisfied, 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 bit and clears the flag bit after 500 milliseconds to prepare for the next trigger or recovery.

[0070] The recovery of the unexpected current condition includes:

[0071] When the real - time charging current Iact and the effective charging current The difference no longer satisfies the above - mentioned trigger condition and continues to not satisfy it for more than 60 seconds, the system will trigger the recovery of the unexpected current condition.

[0072] 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.

[0073] The process of setting and clearing the update flag bit is the same as that of the trigger of the unexpected current condition.

[0074] It can be understood that through the re - trigger and recovery mechanism of the unexpected current condition in this embodiment, the system can adjust the maximum effective charging current in real - time to adapt to various changes during the charging process, thereby improving the accuracy and stability of charging. This mechanism also helps to avoid the problem of estimation error of the remaining charging time caused by 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 the maximum effective charging current issued by the OBC in real - time, the system can better protect the battery pack and the BMS system and extend their service life.

[0075] During slow charging, the OBC outputs at a constant power. When the SOC is low at the initial moment of charging and the pack voltage is low, the charging current is large. As the SOC increases, the charging current gradually decreases. To obtain an accurate effective charging current, the output of the unexpected current condition and the OBC capacity change condition are corrected.

[0076] Calculate the correction coefficient table of the maximum effective charging current. The correction coefficients at different SOCs are obtained according to the ratio of the measured data from SOC = 0 to full charge to the rated voltage of the battery pack, as shown in Table 1.

[0077] Table 1. Relationship between SOC change and slow charging current correction factor

[0078] ;

[0079] Further preferably, the specific effective charging current after correction is:

[0080] The correction factor P1 is obtained by linearly interpolating and looking up the table according to the current SOC data of the vehicle;

[0081] According to the current iteration The correction factor of the current maximum effective charging current is obtained by linearly interpolating and looking up the table ; Then the maximum effective charging current after correction in the iteration = *P1 / is the maximum effective charging current corresponding to the current SOC data of the vehicle.

[0082] In the above solution, the calculation and update of the remaining charging time include: when the vehicle detects the update flag bit, the system will use the corrected maximum effective charging current, the current SOC (State of Charge, remaining battery charge) of the vehicle, and the highest and lowest temperatures of the battery cells as initial conditions, and calculate the remaining charging time through a preset algorithm and update the display value. This step ensures that the user can obtain accurate remaining charging time information in real time.

[0083] Specifically, when implemented, 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 influence of temperature on the charging rate. Exemplarily, based on the above solution, the specific in-vehicle working condition data is shown in Table 2. The following examples are composed of deleted in-vehicle working conditions for the purpose of facilitating the understanding of the strategy content of the above solution. It should be noted that all examples default to: iTsmCurr = 0A, = 120A, iDcDcCurr = 0.2A (the whole vehicle does not turn on the thermal management system, and the DCDC load consumption current is 0.2A), the rated capacity of the battery system is 120Ah, and the initial SOC for charging is 0%.

[0084] By means of iterative calculation or look-up table method, etc., a relatively accurate estimated value of the remaining charging time can be obtained.

[0085] Table 2. In-vehicle working condition data

[0086] ;

[0087] ;

[0088] ;

[0089] Description of the meanings of variables in Table 2:

[0090] Time

[0091] : Charging time, which is counted from the moment when charging starts.

[0092] iOBCMaxCurr : The real-time maximum output current issued by the OBC

[0093] I act : Actual effective charging current

[0094] iPileCurr : Maximum effective charging current (an internal variable of the software, which is equal to iOBCMaxCurr before the non-expected current condition is triggered, and is updated according to the strategy after the non-expected current condition is triggered);

[0095] iOBCMaxCurr_L: The real-time maximum output current issued by the recorded OBC (updated each time the non-expected current condition is triggered or the OBC output capability changes).

[0096] In actual application, when the above-mentioned scheme strategy is not implemented, 20A is used as the maximum effective charging current to estimate the remaining charging time, which is about 120 / 20 = 6h; after implementing this strategy, 16A is used as the maximum effective charging current to estimate the remaining charging time, which is about 120 / 16 = 7.5h, reducing the error by 1.5h; when the charging current is smaller, the error will be greater (for example, for a 3.3kw charging pile and a 1.5kw on-board charger).

[0097] As can be seen from Table 2 above, this strategy can accurately identify the change in the effective charging current during the actual charging process. By judging the change in the effective charging current, the maximum effective charging current is updated iPileCurr The ultimate goal is to update the remaining charging time after obtaining the accurate maximum effective charging current, avoiding the influence of various non-expected conditions on the estimation accuracy of the remaining charging time, thereby improving the user experience.

[0098] Based on the same inventive concept, this embodiment also 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. The system includes:

[0099] A current detection module, which is used to monitor the charging current of the vehicle in real time under slow charging conditions and update the real-time maximum output current issued by the OBC to the initial maximum effective charging current;

[0100] An effective current determination module, configured to determine an effective charging current according to the current consumed by the vehicle thermal management system obtained in real time;

[0101] A discrimination and update module, configured to compare and judge the calculated effective charging current with the actual charging current. When the first discrimination condition or the second discrimination condition is satisfied, the update flag bit 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 discrimination condition is satisfied, the vehicle enters an unexpected current condition and outputs the maximum effective charging current under this condition, and when the second discrimination condition is satisfied, the vehicle enters an OBC capacity change condition and outputs the maximum effective charging current under this condition;

[0102] A calculation module, when the vehicle detects the update flag bit, calculates the remaining charging time with the corrected maximum effective charging current, the current SOC of the vehicle, and the highest and lowest temperatures of the battery cells as the initial conditions, and updates the display value.

[0103] It should be noted here that each module in the above determination system corresponds to each step in implementing the above determination method. The examples and application scenarios implemented by multiple modules and the corresponding steps are the same, but are not limited to the content disclosed in the above Embodiment 1.

[0104] This embodiment also provides an electronic device, including:

[0105] A processor; a memory for storing instructions executable by the processor;

[0106] Wherein, the processor is configured to execute instructions to implement the method for determining the remaining charging time as described above.

[0107] This embodiment also provides a computer-readable storage medium. When the instructions in the computer-readable storage medium are executed by the processor of the electronic device, the electronic device can execute the method for determining the remaining charging time as described above.

[0108] Those of ordinary skill in the art can realize that the units and algorithm steps of each example described in combination with the embodiments disclosed herein can be implemented by electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are executed in a hardware or software manner depends on the specific application and design constraints of the technical solution. Professional technicians can use different methods for each specific application to implement the described functions, but such implementation should not be considered to exceed the scope of this application.

[0109] In addition, each functional module in various embodiments of the present application may be integrated in one processing unit, or each unit may exist physically alone, or two or more units may be integrated in one unit.

[0110] 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 foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and 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; The effective charging current is determined based on the vehicle thermal management system consumption current obtained in real time, including: 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, The current consumed by DCDC; 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; 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 ; 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 ; in The BMS allows charging current to be read from the table according to the real-time SOC and the cell temperature of 25°C; 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; 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 is , It is the maximum effective charging current corresponding to the current SOC data of the vehicle.

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: 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 operating power when the thermal management system is working for cooling.

4. The method for determining the remaining charging time under slow charging conditions according to claim 3, characterized in that: Under the unexpected current condition and the OBC capability change condition, the update flag is set , clear the flag after 500ms.

5. 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: ； The 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.

6. 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 5, 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.

7. 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 as described in any one of claims 1 to 5.

8. 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 5.

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