Method, device and battery management system for determining remaining charging time of electric vehicle

Abstract

The present application provides a method, an apparatus and a battery management system for determining the remaining charging time of an electric vehicle. The method includes: obtaining the state of charge, the battery temperature of a power battery and the maximum charging current of a charging pile; setting the current moment as a first moment, the state of charge as a first state of charge, and the battery temperature as a first battery temperature; determining the charging current of the power battery based on the first state of charge, the first battery temperature and the maximum charging current; determining a second battery temperature and a second state of charge based on the charging current and the first battery temperature; adding the cumulative time with a time step. If the second state of charge is not 100%, setting a second moment as the first moment, the second battery temperature as the first battery temperature and the second state of charge as the first state of charge, and returning to execute the operation of determining the charging current; otherwise, determining the cumulative time as the remaining charging time of the power battery. The present application can more accurately determine the remaining charging time of the electric vehicle.

Description

Technical Field

[0001] The present application relates to the technical field of new energy vehicles, and particularly to a method, a device and a battery management system for determining the remaining charging time of an electric vehicle. Background Art

[0002] The estimation of the remaining charging time of an electric vehicle refers to estimating the remaining charging time of the power battery of the electric vehicle.

[0003] Currently, the method for estimating the remaining charging time of an electric vehicle is to divide the remaining charging capacity of the power battery by the current charging current. However, the charging current of the power battery is related to factors such as the battery temperature, and during the charging process of the power battery, factors such as the battery temperature will also change continuously, resulting in unstable charging current, and even sudden large increases or decreases in the charging current may occur. Therefore, it is difficult to accurately determine the remaining charging time of the electric vehicle based on the current remaining charging time estimation method. Summary of the Invention

[0004] In view of this, the present application provides a method, a device and a battery management system for determining the remaining charging time of an electric vehicle, so as to more accurately determine the remaining charging time of the electric vehicle.

[0005] To achieve the above object, the present application provides a method for determining the remaining charging time of an electric vehicle, including:

[0006] Obtaining the charging influence parameter values of the power battery of the electric vehicle at the current moment, where the charging influence parameter values at least include: the current state of charge of the power battery, the current battery temperature of the power battery, and the maximum charging current of the charging pile;

[0007] Setting the current moment as the first moment, the current state of charge of the power battery as the first state of charge at the first moment, and the current battery temperature of the power battery as the first battery temperature at the first moment;

[0008] Determining the charging current of the power battery based on the first state of charge, the first battery temperature, and the maximum charging current of the charging pile;

[0009] Determining the second battery temperature and the second state of charge of the power battery at the second moment based on the charging current and the first battery temperature, where the second moment is the moment reached by delaying the set time step backward from the first moment;

[0010] Adding the set cumulative time to the time step, where the initial value of the cumulative time is 0;

[0011] If the second state of charge is not 100%, set the second moment as the updated first moment, set the second battery temperature as the first battery temperature of the power battery at the updated first moment, set the second state of charge as the first state of charge at the updated first moment, and return to perform the operation of determining the charging current of the power battery;

[0012] If the second state of charge is 100%, determine the cumulative time as the remaining charging time of the power battery.

[0013] In a possible implementation manner, the determining the charging current of the power battery based on the first state of charge, the first battery temperature, and the maximum charging current of the charging pile includes:

[0014] Determine the standard charging current of the power battery based on the first state of charge and the first battery temperature;

[0015] Determine the smaller value between the standard charging current and the maximum charging current of the charging pile as the charging current of the power battery.

[0016] In another possible implementation manner, the determining the second battery temperature and the second state of charge of the power battery at the second moment based on the charging current and the first battery temperature includes:

[0017] Determine the self-generated heat temperature during charging of the power battery within a set time step based on the charging current;

[0018] Determine the second battery temperature of the power battery at the second moment based on the first battery temperature and the self-generated heat temperature during charging;

[0019] Determine the second state of charge of the power battery at the second moment by using the ampere-hour integration method based on the charging current and the first battery temperature.

[0020] In another possible implementation manner, before determining the self-generated heat temperature during charging of the power battery within a set time step, it further includes:

[0021] Determine the internal resistance of the power battery based on the first state of charge and the first battery temperature;

[0022] Determining the self-generated heat temperature during charging of the power battery within a set time step based on the charging current includes:

[0023] Determine the module mass and specific heat capacity of the power battery;

[0024] Calculate the charging self-generated heat temperature of the power battery within a set time step based on the charging current, battery internal resistance, module mass, and specific heat capacity.

[0025] In another possible implementation, the charging influence parameter value further includes: the ambient temperature of the environment where the power battery is located;

[0026] Before determining the second battery temperature of the power battery at the second moment, it further includes:

[0027] Based on the ambient temperature of the environment where the power battery is located and the first battery temperature, determine the heat exchange temperature transferred by the power battery to the environment where the power battery is located within the time step;

[0028] The determining the second battery temperature of the power battery at the second moment based on the first battery temperature and the charging self-generated heat temperature includes:

[0029] Based on the first battery temperature, the charging self-generated heat temperature, and the heat exchange temperature, determine the second battery temperature of the power battery at the second moment.

[0030] In another possible implementation, before determining the second battery temperature of the power battery at the second moment, it further includes:

[0031] Determine the heating temperature generated by the power battery within the time step due to the heating of the heating module in the electric vehicle;

[0032] The determining the second battery temperature of the power battery at the second moment based on the first battery temperature, the charging self-generated heat temperature, and the heat exchange temperature includes:

[0033] Determine the sum of the first battery temperature, the charging self-generated heat temperature, the heat exchange temperature, and the heating temperature as the second battery temperature of the power battery at the second moment.

[0034] In another aspect, the present application provides a method for determining the remaining charging time of an electric vehicle, including:

[0035] Obtain the charging influence parameter values of the power battery of the electric vehicle at the current moment, where the charging influence parameter values include: the current state of charge of the power battery, the current battery temperature of the power battery, and the maximum charging current of the charging pile;

[0036] Based on the configured charging time correspondence table, query the target remaining charging time corresponding to the current state of charge, the current battery temperature, and the maximum charging current of the charging pile, and determine the target remaining charging time as the remaining charging time of the power battery;

[0037] Among them, the charging time corresponding table stores the remaining charging times corresponding to multiple groups of candidate charging influence parameter values. Among them, each group of candidate charging influence parameter values includes: the candidate state of charge of the power battery, the candidate battery temperature of the power battery, and the candidate maximum charging current of the charging pile, and at least one of the candidate state of charge, candidate battery temperature, and candidate maximum charging current is different in different groups of candidate charging influence parameter values;

[0038] Among them, the remaining charging time corresponding to each group of candidate charging influence parameter values is determined by the following method:

[0039] Set the moment when the candidate charging influence parameter values are obtained as the first moment, the candidate state of charge as the first state of charge at the first moment, and the candidate battery temperature of the power battery as the first battery temperature at the first moment;

[0040] Based on the first state of charge, the first battery temperature, and the candidate maximum charging current of the charging pile, determine the charging current of the power battery;

[0041] Based on the charging current and the first battery temperature, determine the second battery temperature and the second state of charge of the power battery at the second moment. The second moment is the moment reached after delaying a set time step backward from the first moment;

[0042] Add the set cumulative time to the time step. The initial value of the cumulative time is 0;

[0043] If the second state of charge is not 100%, set the second moment as the updated first moment, set the second battery temperature as the first battery temperature of the power battery at the updated first moment, set the second state of charge as the second state of charge at the updated first moment, and return to execute the operation of determining the charging current of the power battery;

[0044] If the second state of charge is 100%, determine the cumulative time as the remaining charging time of the power battery, and obtain the remaining charging time corresponding to the candidate charging influence parameter.

[0045] On the other hand, the present application provides a device for determining the remaining charging time of an electric vehicle, including:

[0046] A parameter acquisition unit for acquiring the charging influence parameter values of the power battery of the electric vehicle at the current moment. The charging influence parameter values at least include: the current state of charge of the power battery, the current battery temperature of the power battery, and the maximum charging current of the charging pile;

[0047] An information setting unit for setting the current moment as the first moment, the current state of charge of the power battery as the first state of charge at the first moment, and the current battery temperature of the power battery as the first battery temperature at the first moment;

[0048] A current determination unit for determining the charging current of the power battery based on the first state of charge, the first battery temperature, and the maximum charging current of the charging pile;

[0049] A state prediction unit for determining the second battery temperature and the second state of charge of the power battery at the second moment based on the charging current and the first battery temperature, where the second moment is the moment reached after delaying the first moment by a set time step;

[0050] A time accumulation unit for adding the set accumulation time to the time step, where the initial value of the accumulation time is 0;

[0051] A loop update unit for, if the second state of charge is not 100%, setting the second moment as the updated first moment, setting the second battery temperature as the first battery temperature of the power battery at the updated first moment, setting the second state of charge as the first state of charge at the updated first moment, and returning to execute the operation of determining the charging current of the power battery;

[0052] A time determination unit for, if the second state of charge is 100%, determining the accumulation time as the remaining charging time of the power battery.

[0053] In another aspect, the present application also provides a device for determining the remaining charging time of an electric vehicle, including:

[0054] A parameter acquisition unit for acquiring the charging influence parameter values of the power battery of the electric vehicle at the current moment, where the charging influence parameter values include: the current state of charge of the power battery, the current battery temperature of the power battery, and the maximum charging current of the charging pile;

[0055] A remaining time query unit for querying the target remaining charging time corresponding to the current state of charge, the current battery temperature, and the maximum charging current of the charging pile based on the configured charging time correspondence table, and determining the target remaining charging time as the remaining charging time of the power battery;

[0056] Among them, the charging time correspondence table stores the remaining charging times corresponding to multiple sets of candidate charging influence parameter values. Among them, each set of candidate charging influence parameter values includes: the candidate state of charge of the power battery, the candidate battery temperature of the power battery, and the candidate maximum charging current of the charging pile, and at least one of the candidate state of charge, candidate battery temperature, and candidate maximum charging current is different in different sets of candidate charging influence parameter values;

[0057] Among them, the remaining charging time corresponding to each set of candidate charging influence parameter values is determined by the following method:

[0058] Set the moment when the candidate charging influence parameter values are obtained as the first moment, the candidate state of charge as the first state of charge at the first moment, and the candidate battery temperature of the power battery as the first battery temperature at the first moment;

[0059] Based on the first state of charge, the first battery temperature, and the candidate maximum charging current of the charging pile, determine the charging current of the power battery;

[0060] Based on the charging current and the first battery temperature, determine the second battery temperature and the second state of charge of the power battery at the second moment. The second moment is the moment reached after delaying a set time step backward from the first moment;

[0061] Add the set cumulative time to the time step. The initial value of the cumulative time is 0;

[0062] If the second state of charge is not 100%, set the second moment as the updated first moment, set the second battery temperature as the first battery temperature of the power battery at the updated first moment, set the second state of charge as the second state of charge at the updated first moment, and return to execute the operation of determining the charging current of the power battery;

[0063] If the second state of charge is 100%, determine the cumulative time as the remaining charging time of the power battery to obtain the remaining charging time corresponding to the candidate charging influence parameter.

[0064] On the other hand, the present application provides a battery management system, including:

[0065] A controller and a memory;

[0066] The controller is used to execute the method for determining the remaining charging time of the electric vehicle as described in any one of the above;

[0067] The memory is used to store the program required for the controller to execute the operation.

[0068] As can be seen from the above, the present application determines the charging current of the power battery of an electric vehicle based on the state of charge and battery temperature of the power battery and the maximum charging current of the charging pile, fully considering the influence of the state of charge of the power battery, battery temperature, and the maximum charging current that the charging pile can provide on the charging current of the power battery, making the determined charging current of the power battery more accurate.

[0069] Moreover, when the present application needs to determine the remaining charging time of the power battery at a certain moment, it combines the charging current and battery temperature of the power battery at that moment, continuously iterates to determine the battery temperature and state of charge at subsequent different moments, and accumulates the time required for the power battery to charge to different states of charge during the iteration process. Finally, the remaining charging time required for the state of charge of the power battery to reach 100% is obtained through iteration. Since the mutual influence among the battery temperature, state of charge, and charging current at different moments after the current moment is fully considered during the iteration process, the determined remaining charging time is more accurate. BRIEF DESCRIPTION OF THE DRAWINGS

[0070] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only the embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained according to the provided drawings without creative efforts.

[0071] Figure 1 FIG. shows a schematic flowchart of a method for determining the remaining charging time of an electric vehicle provided by an embodiment of the present application;

[0072] Figure 2 FIG. shows another schematic flowchart of a method for determining the remaining charging time of an electric vehicle provided by an embodiment of the present application;

[0073] Figure 3 FIG. shows a schematic flowchart of another method for determining the remaining charging time of an electric vehicle provided by an embodiment of the present application;

[0074] Figure 4 FIG. shows a schematic flowchart of determining the remaining charging time corresponding to each group of candidate charging influence parameter values in this embodiment;

[0075] Figure 5 FIG. shows a schematic structural diagram of a device for determining the remaining charging time of an electric vehicle provided by an embodiment of the present application;

[0076] Figure 6 FIG. shows a schematic structural diagram of another device for determining the remaining charging time of an electric vehicle provided by an embodiment of the present application;

[0077] Figure 7 It shows a schematic diagram of the composition structure of a battery management system provided by an embodiment of the present application. Specific implementation manners

[0078] The solution of the present application can be applied to any electric vehicle equipped with a power battery to more accurately determine the remaining charging time of the power battery of the electric vehicle. Among them, the specific form of the electric vehicle in the present application is not limited. For example, the electric vehicle can be a so-called new energy vehicle using a power battery, or it can be in the form of an electric train, etc.

[0079] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0080] As Figure 1 shown, it shows a method for determining the remaining charging time of an electric vehicle in the present application. The method of this embodiment can be applied to the battery management system (Battery Management System, BMS) of the electric vehicle to calculate the remaining charging time of the power battery at each moment in real time during the charging process of the power battery of the electric vehicle.

[0081] The method of this embodiment can also be applied to an electronic device outside the electric vehicle to determine the remaining charging time of the power battery at a certain moment in combination with the charging influence parameters of the power battery of the electric vehicle, and feed the determined remaining charging time back to the electric vehicle, or generate a configuration table for querying the remaining charging time, etc. The present application does not limit this.

[0082] The method of this embodiment may include:

[0083] S101, obtain the parameter value of the charging influence parameter of the power battery of the electric vehicle at the current moment.

[0084] Among them, the parameter value of the charging influence parameter refers to the parameter values of various parameters that affect the charging time of the power battery.

[0085] In the present application, considering the state of charge and battery temperature of the power battery, as well as the maximum charging current of the charging pile charging the power battery, all of which will affect the charging time of the power battery. Therefore, the parameter value of the charging influence parameter at least includes: the current state of charge of the power battery, the current battery temperature of the power battery, and the maximum charging current of the charging pile.

[0086] Among them, the state of charge is the value of the state of charge (SOC) of the power battery. The state of charge refers to the available state of the remaining charge in the power battery, which is used to reflect the remaining capacity of the battery. Numerically, it is defined as the ratio of the remaining capacity to the battery capacity. The state of charge of the power battery can be calculated by the BMS in the electric vehicle, and this application does not limit the specific method for determining the state of charge.

[0087] Similarly, the battery temperature is the value of the battery temperature, and the maximum charging current of the charging pile is also the value of the maximum charging current of the charging pile.

[0088] Among them, the battery temperature can be obtained by the BMS through a temperature sensor, and the maximum charging current of the charging pile can be sent by the charging pile to the BMS when the power battery is connected to the charging pile.

[0089] Of course, if the solution of this application is applied to an electronic device, and the electronic device can obtain the above charging influence parameter values and other subsequent relevant parameters through the BMS, this will not be elaborated here.

[0090] It can be understood that in this application, only for the convenience of distinction, this application refers to the state of charge of the power battery at the current moment as the current state of charge, and refers to the battery temperature of the power battery at the current moment as the current battery temperature.

[0091] S102, set the current moment as the first moment, the current state of charge of the power battery as the first state of charge at the first moment, and the current battery temperature of the power battery as the first battery temperature at the first moment.

[0092] In this application, in order to determine the remaining charging time of the power battery at the current moment, the current moment is used as the starting moment for subsequent iteration. Therefore, the setting operation of this step is performed.

[0093] In this application, the first moment is not a fixed moment, but only the earlier one of two adjacent moments with a set time step difference in the iteration process.

[0094] S103, based on the first state of charge, the first battery temperature, and the maximum charging current of the charging pile, determine the charging current of the power battery.

[0095] It can be understood that since the charging current of the power battery is not only affected by the state of charge and the battery temperature of the power battery, but also limited by the maximum charging current that the charging pile can provide, therefore, this application combines these three factors to more accurately predict the charging current of the power battery at the first moment.

[0096] Among them, there are various possibilities for determining the charging current of the power battery based on these three factors, and the present application does not limit this. For ease of understanding, one possible case is taken as an example to illustrate:

[0097] In one possible case, the standard charging current of the power battery can be determined based on the first state of charge and the first battery temperature. Then, the smaller value between the standard charging current and the maximum charging current of the charging pile is determined as the charging current of the power battery.

[0098] Among them, the standard charging current refers to the charging current that the power battery can reach due to the influence of the state of charge and the battery temperature when the battery parameters of the power battery are fixed.

[0099] For example, based on the first state of charge and the first battery temperature, the configured battery performance configuration table can be queried to determine the standard charging current of the power battery. Among them, the battery performance configuration table includes the standard charging currents corresponding to different states of charge and battery temperatures. The standard charging currents corresponding to different states of charge and battery temperatures in the battery performance configuration table are obtained through experimental tests or provided by the battery manufacturer, and this is not limited herein.

[0100] S104. Based on the charging current and the first battery temperature, determine the second battery temperature and the second state of charge of the power battery at the second moment.

[0101] Among them, the second moment is the moment reached by delaying a set time step backward from the first moment. It can be understood that as subsequent iterations continue, the specific value of the second moment will also change continuously with the change of the specific value of the first moment.

[0102] The time step can be set as needed. For example, the time step can be 1 second, etc., and the present application does not limit this.

[0103] It can be understood that since the charging current will affect the change of the battery temperature, therefore, when the charging current and the battery temperature at the first moment are known, based on the influence of the charging current on the battery temperature, the battery temperature of the power battery at the first moment can be estimated.

[0104] For the convenience of distinction in the present application, the battery temperature of the power battery at the first moment is referred to as the first battery temperature, and the battery temperature of the power battery at the second moment is referred to as the second battery temperature.

[0105] In a possible implementation, the present application can determine the charging self-heating temperature of the power battery within a set time step in combination with the charging current. The charging self-heating temperature refers to the temperature change value generated by the power battery within the time step due to charging. Accordingly, based on the first battery temperature and the charging self-heating temperature, the second battery temperature of the power battery at the second moment can be determined.

[0106] For example, the sum of the first battery temperature and the charging self-heating temperature is determined as the second battery temperature of the power battery at the second moment.

[0107] Among them, determining the charging self-heating temperature according to the charging current can be to estimate the charging self-heating temperature in combination with the influence of the battery temperature during the charging process of the power battery, and there can be various possible specific implementations.

[0108] In an alternative manner, considering that the self-heating temperature of the power battery during charging is also related to the battery internal resistance, etc., therefore, in the present application, the battery internal resistance of the power battery can also be determined based on the first state of charge and the first battery temperature. For example, by querying a pre-configured battery performance configuration table, the battery internal resistance corresponding to the first battery temperature and the first state of charge is obtained. The battery performance configuration table can include the battery internal resistance and the standard battery current corresponding to the first battery temperature and the first state of charge. For the acquisition of the data in the battery performance configuration table, reference can be made to the relevant introduction in the previous embodiments. Of course, the battery internal resistance of the power battery can also be determined by other means, and there is no limitation thereto.

[0109] Furthermore, the present application can also determine the module mass and specific heat capacity of the power battery. Among them, the module mass is the weight of the power battery, and the specific heat capacity is the heat required for the temperature of the power battery per unit weight to increase by 1K. The module mass and specific heat capacity can be pre-configured. On this basis, the present application can calculate the charging self-heating temperature of the power battery within a set time step based on the charging current, battery internal resistance, module mass and specific heat capacity. For example, by combining these parameter values and using a set physical formula to calculate the charging self-heating temperature, which will not be elaborated here and will be described in combination with a case later.

[0110] Among them, there can also be various possible ways to determine the state of charge of the power battery at the second moment based on the charging current and the first battery temperature. For example, in a possible case, based on the charging current and the first battery temperature, the ampere-hour integration method is used to determine the second state of charge of the power battery at the second moment.

[0111] S105, add the set cumulative time to the time step.

[0112] Among them, the initial value of the cumulative time is 0.

[0113] For example, assume that the above step S104 is executed for the first time. Then the cumulative time is still the initial value, which is 0. After adding the time step to the cumulative time, the cumulative time becomes the time step. On this basis, when the step S105 is executed again, the time step needs to be added to the most recently determined cumulative time. Therefore, each time the above step S104 is iteratively executed, the cumulative time will increase by a time step, so that the cumulative duration gradually increases through continuous iteration.

[0114] It can be understood that since the state of charge of the power battery in this application reflects the remaining capacity of the battery, and this application estimates the state of charge of the power battery at each moment after the current moment through continuous iteration. Therefore, for the state of charge estimated at a certain moment, it is necessary to determine the charging time of the battery that needs to be accumulated to reach this state of charge. It can be seen that this cumulative time reflects the charging time required for the power battery to charge to the second state of charge after the current moment in step S101.

[0115] S106, if the second state of charge is not 100%, set the second moment as the updated first moment, set the second battery temperature as the first battery temperature of the power battery at the updated first moment, set the second state of charge as the first state of charge at the updated first moment, and return to execute the operation of determining the charging current of the power battery in step S103.

[0116] S107, if the second state of charge is 100%, determine the cumulative time as the remaining charging time of the power battery.

[0117] Among them, when the value of the second state of charge is 100%, it means that the ratio of the remaining capacity of the battery to the battery capacity is 1, that is, the power battery is fully charged.

[0118] Since the cumulative time corresponding to the second state of charge is actually the charging time required for the power battery to charge to the second state of charge after the current moment, when the second state of charge is 100%, the cumulative time is the remaining charging time required from the current moment until the power battery is fully charged.

[0119] This application determines the charging current of the power battery according to the state of charge and battery temperature of the power battery of the electric vehicle and the maximum charging current of the charging pile, fully considering the influence of the state of charge of the power battery, battery temperature and the maximum charging current that the charging pile can provide on the charging current of the power battery, so that the determined charging current of the power battery is more accurate.

[0120] Moreover, when the present application needs to determine the remaining charging time of the power battery at a certain moment, it will combine the charging current and the battery temperature of the power battery at this moment, continuously iterate to determine the battery temperature and state of charge at subsequent different moments, and accumulate the time required for the power battery to charge to different states of charge during the iteration process. Finally, the remaining charging time required for the state of charge of the power battery to reach 100% is obtained through iteration. Since the mutual influence among the battery temperature, state of charge, and charging current at different moments after the current moment is fully considered during the iteration process, the determined remaining charging time is more accurate, and the situation where the remaining charging time determined at adjacent moments has a jump due to the mutation of the charging current at a single moment can also be reduced.

[0121] It can be understood that in practical applications, the second battery temperature of the power battery at the second moment is not only related to the charging current of the power battery at the first moment, but also related to the ambient temperature of the environment where the power battery is located. Therefore, the charging influence parameter value in the present application can also include: the ambient temperature of the environment where the power battery is located.

[0122] On this basis, the present application can also determine the heat exchange temperature transferred by the power battery to the environment where the power battery is located within a time step based on the ambient temperature of the environment where the power battery is located and the first battery temperature. Correspondingly, the second battery temperature of the power battery at the second moment can be determined by combining the first battery temperature, the charging current of the power battery, and the heat exchange temperature.

[0123] For example, on the premise of determining the self-generated heat temperature during charging based on the charging current, the second battery temperature of the power battery at the second moment can be determined based on the first battery temperature, the self-generated heat temperature during charging, and the heat exchange temperature. For example, after adding the first battery temperature to the self-generated heat temperature during charging and the heat exchange temperature, it is determined as the second battery temperature of the power battery at the second moment.

[0124] In any of the above embodiments, if there is heating in the heating module of the electric vehicle, then the second battery temperature of the power battery at the second moment is not only related to the charging current of the power battery at the first moment, but also related to the temperature rise of the power battery caused by the heating module. On this basis, the present application can also determine the heating temperature generated by the heating module of the electric vehicle in the power battery within this time step. Correspondingly, the second battery temperature can be determined based on the first battery temperature, the charging current, and the heating temperature.

[0125] For example, the first temperature can be determined as the second battery temperature of the power battery at the second moment by adding the self-generated heat temperature during charging, the heat exchange temperature, and the heating temperature determined previously.

[0126] For the sake of easy understanding, the following takes a situation as an example to illustrate, such asFigure 2 , which shows a schematic flowchart of a method for determining the remaining charging time of an electric vehicle in an embodiment of the present application. The method of this embodiment may include:

[0127] S201, obtaining the charging influence parameter values of the power battery of the electric vehicle at the current moment.

[0128] The charging influence parameter values include: the current state of charge of the power battery, the current battery temperature of the power battery, the ambient temperature of the environment where the power battery is located, and the maximum charging current of the charging pile.

[0129] S202, setting the current moment as the first moment, setting the current state of charge of the power battery as the first state of charge at the first moment, and setting the current battery temperature of the power battery as the first battery temperature at the first moment.

[0130] S203, querying the configured battery performance configuration table based on the first state of charge and the first battery temperature of the power battery, and determining the standard charging current and the internal resistance of the battery of the power battery.

[0131] Among them, the battery performance configuration table includes the standard charging currents corresponding to different states of charge and battery temperatures.

[0132] S204, determining the smaller value between the available charging current and the maximum charging current of the charging pile as the charging current of the power battery.

[0133] S205, determining the module mass and specific heat capacity of the power battery.

[0134] S206, determining the self-generated heat temperature during charging of the power battery within a set time step based on the charging current, internal resistance, module mass, and specific heat capacity of the power battery.

[0135] For example, the self-generated heat temperature ΔT1 during charging of the power battery within a set time step can be calculated by the following formula (1):

[0136]

[0137] Among them, I is the charging current of the power battery, R is the internal resistance of the battery, C is the specific heat capacity of the power battery; m is the module mass of the power battery.

[0138] S207, determining the heat exchange temperature transferred from the power battery to the environment where the power battery is located within this time step based on the ambient temperature of the environment where the power battery is located and the first battery temperature of the power battery.

[0139] For example, the heat exchange temperature ΔT2 transferred from the power battery to the environment where the power battery is located within this time step can be calculated by the following formula (2):

[0140] ΔT2 = (T e - T') × A (Formula 2);

[0141] where, T e is the ambient temperature; T' is the first battery temperature at the first moment; A is the set heat exchange coefficient of the ambient temperature.

[0142] S208. Based on the first battery temperature of the power battery, determine whether the heating module in the electric vehicle is in the heating mode. If so, execute step S209; if not, set the heating temperature of the battery heating module to 0 and execute step S210.

[0143] For example, if the first battery temperature is less than the set value, the heating module is in the heating mode; otherwise, the heating module is not in the heating mode.

[0144] Among them, the heating module can be a positive temperature coefficient (PTC) heating element in the electric vehicle, and there is no restriction on this.

[0145] S209. Determine the heating temperature generated by the power battery during this time step due to the heating of the battery heating model, and execute step 210.

[0146] For example, the heating temperature can be a preset empirical value ΔT3.

[0147] S210. Based on the first battery temperature of the power battery, the self-heat generation temperature during charging, the heat exchange temperature, and the heating temperature, determine the second battery temperature of the power battery at the second moment.

[0148] The second moment is the moment reached after delaying a set time step from the first moment.

[0149] For example, the second battery temperature T can be calculated by the following formula three:

[0150] T = T' + ΔT1 + ΔT2 + ΔT3 (Formula 3);

[0151] where, ΔT3 is the heating temperature.

[0152] S211. Based on the first state of charge and the charging current of the power battery, use the ampere-hour integration method to determine the second state of charge of the power battery at the second moment.

[0153] For example, the second state of charge SOC can be calculated by the following formula four:

[0154]

[0155] Wherein, SOC' is the first state of charge at the first moment, C is the specific heat capacity of the power battery, and I is the charging current of the power battery.

[0156] S212. Add the time step to the cumulative time.

[0157] Wherein, the initial value of the cumulative time is 0.

[0158] S213. Detect whether the second state of charge of the power battery is 100%. If it is, determine the cumulative time as the remaining charging time of the power battery, and end. If not, set the second moment as the updated first moment, set the second state of charge at the second moment as the first state of charge at the updated first moment, set the second temperature value as the first temperature value at the updated first moment, and return to execute step S203.

[0159] On the other hand, the present application also provides another method for determining the remaining charging time of an electric vehicle. As Figure 3 shown, it shows a schematic flow chart of another method for determining the remaining charging time of an electric vehicle in the present application. The method of this embodiment can be applied to the battery management system BMS of an electric vehicle. The method of this embodiment may include:

[0160] S301: Obtain the charging influence parameter values of the power battery of the electric vehicle at the current moment.

[0161] The charging influence parameter values include: the current state of charge of the power battery, the current battery temperature of the power battery, and the maximum charging current of the charging pile.

[0162] For the specific meanings of the charging influence parameter values, reference can be made to the relevant introductions in the previous embodiments, which will not be elaborated here.

[0163] S302. Based on the configured charging time correspondence table, query the target remaining charging time corresponding to the current state of charge, the current battery temperature, and the maximum charging current of the charging pile, and determine the target remaining charging time as the remaining charging time of the power battery.

[0164] Wherein, the charging time correspondence table stores the remaining charging times corresponding to multiple groups of candidate charging influence parameter values. Each group of candidate charging influence parameter values includes: the candidate state of charge of the power battery, the candidate battery temperature of the power battery, and the candidate maximum charging current of the charging pile, and at least one of the candidate state of charge, the candidate battery temperature, and the candidate maximum charging current is different in different groups of candidate charging influence parameter values.

[0165] It can be understood that, merely for the convenience of distinction, in this application, each possible state of charge of the power battery in the charging time correspondence table is referred to as a candidate state of charge, each possible battery temperature of the power battery is referred to as a candidate battery temperature, and the maximum charging current that the charging pile may correspond to is referred to as a candidate maximum charging current.

[0166] It can be understood that the remaining charging time corresponding to each set of candidate charging influence parameter values in the charging time correspondence table can all be determined by the method of the previous Figures 1 to 2 related embodiments. For the convenience of understanding, reference can be made to Figure 4 , which shows a schematic flowchart of a process for determining the remaining charging time corresponding to each set of candidate charging influence parameter values in this application. The process of this embodiment may include:

[0167] S401, set the moment when the candidate charging influence parameter value is obtained as the first moment, the candidate state of charge in the candidate charging influence parameter value as the first state of charge at the first moment, and the candidate battery temperature of the power battery as the first battery temperature at the first moment.

[0168] S402, based on the first state of charge, the first battery temperature, and the candidate maximum charging current of the charging pile, determine the charging current of the power battery.

[0169] Among them, this step is the same as the step of determining the charging current of the power battery based on the first state of charge, the first battery temperature, and the maximum charging current of the charging pile before. Reference can be made to the previous introduction, and only need to replace the maximum charging current of the previous charging pile with the candidate maximum charging current of the charging pile here. The specific implementation process is the same and will not be elaborated here.

[0170] S403, based on the charging current and the first battery temperature, determine the second battery temperature and the second state of charge of the power battery at the second moment.

[0171] Among them, the second moment is the moment reached by delaying a set time step backward from the first moment.

[0172] S404, add the set cumulative time to the time step.

[0173] Among them, the initial value of the cumulative time is 0.

[0174] S405, if the second state of charge is not 100%, set the second moment as the updated first moment, set the second battery temperature as the first battery temperature of the power battery at the updated first moment, set the second state of charge as the second state of charge at the updated first moment, and return to execute the operation of determining the charging current of the power battery in step S402.

[0175] S406. If the second state of charge is 100%, determine the cumulative time as the remaining charging time of the power battery, and obtain the remaining charging time corresponding to the candidate charging influence parameter.

[0176] It can be understood that the above steps S403 to S406 can be the same as the implementation of the relevant steps in the previous embodiments. For specific details, please refer to the relevant introduction in the previous embodiments and will not be elaborated here.

[0177] It can be understood that by continuously selecting different sets of candidate charging influence parameter values and executing Figure 4 the process, the remaining charging times corresponding to multiple different sets of candidate charging influence parameter values can be obtained, and thus a charging time correspondence table can be constructed.

[0178] It can be understood that from the effect description of the previous embodiments, the embodiments of the present application can more accurately determine the remaining charging time corresponding to different candidate charging parameter influence values. On this basis, after the BMS obtains the charging influence parameter value of the power battery at the current moment, it can more quickly and accurately determine the current remaining charging time of the power battery by querying the charging time correspondence table.

[0179] Corresponding to a method for determining the remaining charging time of an electric vehicle in the present application, the present application also provides a device for determining the remaining charging time of an electric vehicle.

[0180] As Figure 5 shown, it shows a device for determining the remaining charging time of an electric vehicle in the present application, including:

[0181] A parameter acquisition unit 501, configured to acquire the charging influence parameter value of the power battery of the electric vehicle at the current moment, where the charging influence parameter value at least includes: the current state of charge of the power battery, the current battery temperature of the power battery, and the maximum charging current of the charging pile;

[0182] An information setting unit 502, configured to set the current moment as the first moment, the current state of charge of the power battery as the first state of charge at the first moment, and the current battery temperature of the power battery as the first battery temperature at the first moment;

[0183] A current determination unit 503, configured to determine the charging current of the power battery based on the first state of charge, the first battery temperature, and the maximum charging current of the charging pile;

[0184] A state prediction unit 504, configured to determine the second battery temperature and the second state of charge of the power battery at the second moment based on the charging current and the first battery temperature, where the second moment is the moment reached by delaying the set time step backward from the first moment;

[0185] A time accumulation unit 505 for adding a set accumulation time to the time step, the initial value of the accumulation time being 0;

[0186] A loop update unit 506 for, if the second state of charge is not 100%, setting the second moment as the updated first moment, setting the second battery temperature as the first battery temperature of the power battery at the updated first moment, setting the second state of charge as the first state of charge at the updated first moment, and returning to execute the operation of determining the charging current of the power battery;

[0187] A time determination unit 507 for, if the second state of charge is 100%, determining the accumulation time as the remaining charging time of the power battery.

[0188] In a possible case, the current determination unit includes:

[0189] A first current determination unit for determining a standard charging current of the power battery based on the first state of charge and the first battery temperature;

[0190] A second current determination unit for determining the smaller value between the standard charging current and the maximum charging current of the charging pile as the charging current of the power battery.

[0191] In yet another possible implementation, the state speculation unit may include:

[0192] A self-heat generation determination unit for determining a self-heat generation temperature during charging of the power battery within a set time step based on the charging current;

[0193] A temperature speculation unit for determining a second battery temperature of the power battery at the second moment based on the first battery temperature and the self-heat generation temperature during charging;

[0194] A state-of-charge speculation unit for determining a second state of charge of the power battery at the second moment by using the ampere-hour integration method based on the charging current and the first battery temperature.

[0195] In yet another possible implementation, the device may further include:

[0196] An internal resistance determination unit for determining a battery internal resistance of the power battery based on the first state of charge and the first battery temperature before the self-heat generation determination unit determines the self-heat generation temperature during charging of the power battery within a set time step;

[0197] The self-heat generation determination unit includes:

[0198] An attribute determination unit for determining the module mass and specific heat capacity of the power battery.

[0199] A self-heat generation calculation unit for calculating the self-heat generation temperature of the power battery during a set time step based on the charging current, battery internal resistance, module mass, and specific heat capacity.

[0200] In yet another possible implementation, the charging influence parameter values obtained by the parameter acquisition unit further include: the ambient temperature of the environment where the power battery is located.

[0201] The device may further include: a heat exchange determination unit for determining the heat exchange temperature transferred from the power battery to the environment where the power battery is located during the time step based on the ambient temperature of the environment where the power battery is located and the first battery temperature before the temperature prediction unit determines the second battery temperature of the power battery at the second moment.

[0202] The temperature prediction unit is specifically configured to determine the second battery temperature of the power battery at the second moment based on the first battery temperature, the charging self-heat generation temperature, and the heat exchange temperature.

[0203] In an alternative manner, the device may further include:

[0204] A heating determination unit for determining the heating temperature generated by the heating module in the electric vehicle in the power battery during the time step before the temperature prediction unit determines the second battery temperature of the power battery at the second moment.

[0205] The temperature prediction unit is specifically configured to determine the sum of the first battery temperature, the charging self-heat generation temperature, the heat exchange temperature, and the heating temperature as the second battery temperature of the power battery at the second moment.

[0206] On the other hand, corresponding to yet another method for determining the remaining charging time of an electric vehicle in this application, this application further provides yet another device for determining the remaining charging time of an electric vehicle.

[0207] As Figure 6 shown, it shows yet another schematic structural diagram of a device for determining the remaining charging time of an electric vehicle in this application. The device in this embodiment may include:

[0208] A parameter acquisition unit 601 for acquiring the charging influence parameter values of the power battery of the electric vehicle at the current moment. The charging influence parameter values include: the current state of charge of the power battery, the current battery temperature of the power battery, and the maximum charging current of the charging pile.

[0209] A remaining time query unit 602, configured to query a target remaining charging time corresponding to the current state of charge, the current battery temperature, and the maximum charging current of the charging pile based on a configured charging time correspondence table, and determine the target remaining charging time as the remaining charging time of the power battery;

[0210] Wherein, the charging time correspondence table stores remaining charging times respectively corresponding to multiple groups of candidate charging influence parameter values. Each group of candidate charging influence parameter values includes: a candidate state of charge of the power battery, a candidate battery temperature of the power battery, and a candidate maximum charging current of the charging pile, and at least one of the candidate state of charge, candidate battery temperature, and candidate maximum charging current is different in different groups of candidate charging influence parameter values;

[0211] Wherein, the remaining charging time corresponding to each group of candidate charging influence parameter values is determined by the following method:

[0212] Set the moment when the candidate charging influence parameter values are obtained as the first moment, the candidate state of charge as the first state of charge at the first moment, and the candidate battery temperature of the power battery as the first battery temperature at the first moment;

[0213] Based on the first state of charge, the first battery temperature, and the candidate maximum charging current of the charging pile, determine the charging current of the power battery;

[0214] Based on the charging current and the first battery temperature, determine the second battery temperature and the second state of charge of the power battery at a second moment, where the second moment is the moment reached after delaying a set time step backward from the first moment;

[0215] Add the set cumulative time to the time step, where the initial value of the cumulative time is 0;

[0216] If the second state of charge is not 100%, set the second moment as the updated first moment, set the second battery temperature as the first battery temperature of the power battery at the updated first moment, set the second state of charge as the second state of charge at the updated first moment, and return to execute the operation of determining the charging current of the power battery;

[0217] If the second state of charge is 100%, determine the cumulative time as the remaining charging time of the power battery, and obtain the remaining charging time corresponding to the candidate charging influence parameter.

[0218] On the other hand, the present application further provides a battery management system, as Figure 7As shown, it shows a schematic diagram of a composition structure of a battery management system according to the present application. The battery management system of this embodiment at least includes a controller 701 and a memory 702.

[0219] Among them, the controller 701 is used to execute the method for determining the remaining charging time of an electric vehicle as described in the above embodiment;

[0220] The memory 702 is used to store the programs required for the controller to perform operations.

[0221] Of course, the battery management system may further include sensor components such as a temperature sensor for sensing the battery temperature and an ambient temperature sensor for sensing the ambient temperature, or other components, etc., which are not limited thereto.

[0222] It should be noted that each embodiment in this specification is described in a progressive manner. The key point of each embodiment is to illustrate the differences from other embodiments. The same or similar parts among the embodiments can be referred to each other. At the same time, the features described in each embodiment of this specification can be replaced or combined with each other, enabling those skilled in the art to implement or use the present application. For device-type embodiments, since they are basically similar to the method embodiments, the description is relatively simple, and the relevant parts can refer to the partial description of the method embodiments.

[0223] Finally, it should also be noted that in this text, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including one..." does not exclude the existence of another identical element in the process, method, article or device including the element.

[0224] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments shown herein, but will be accorded the widest scope consistent with the principles and novel features disclosed herein.

[0225] The above are only the preferred embodiments of the present application. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present application, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present application.

Claims

1. A method for determining the remaining charging time of an electric vehicle, characterized in that, Including: Obtaining a charging influence parameter value of a power battery of an electric vehicle at the current moment, where the charging influence parameter value at least includes: the current state of charge of the power battery, the current battery temperature of the power battery, and the maximum charging current of a charging pile; Setting the current moment as the first moment, the current state of charge of the power battery as the first state of charge at the first moment, and the current battery temperature of the power battery as the first battery temperature at the first moment; Determining the charging current of the power battery based on the first state of charge, the first battery temperature, and the maximum charging current of the charging pile; Determining the second battery temperature and the second state of charge of the power battery at a second moment based on the charging current and the first battery temperature, where the second moment is the moment reached after delaying a set time step backward from the first moment; Adding the set time step to the set cumulative time, where the initial value of the cumulative time is 0; If the second state of charge is not 100%, setting the second moment as the updated first moment, setting the second battery temperature as the first battery temperature of the power battery at the updated first moment, setting the second state of charge as the first state of charge at the updated first moment, and returning to execute the operation of determining the charging current of the power battery; If the second state of charge is 100%, determining the cumulative time as the remaining charging time of the power battery.

2. The method according to claim 1, characterized in that, The determining the charging current of the power battery based on the first state of charge, the first battery temperature, and the maximum charging current of the charging pile includes: Determining the standard charging current of the power battery based on the first state of charge and the first battery temperature; Determining the smaller value between the standard charging current and the maximum charging current of the charging pile as the charging current of the power battery.

3. The method according to claim 1, characterized in that, The determining the second battery temperature and the second state of charge of the power battery at the second moment based on the charging current and the first battery temperature includes: Determining the self-heating temperature generated during charging of the power battery within the set time step based on the charging current; Determining the second battery temperature of the power battery at the second moment based on the first battery temperature and the self-heating temperature generated during charging; Determining the second state of charge of the power battery at the second moment by using the ampere-hour integration method based on the charging current and the first battery temperature.

4. The method according to claim 3, characterized in that, Before the determining the self-heating temperature generated during charging of the power battery within the set time step, it further includes: Determining the internal resistance of the power battery based on the first state of charge and the first battery temperature; Determining the self-heating temperature generated during charging of the power battery within the set time step based on the charging current includes: Determining the module mass and specific heat capacity of the power battery; Calculating the self-heating temperature generated during charging of the power battery within the set time step based on the charging current, the internal resistance, the module mass, and the specific heat capacity.

5. The method according to claim 3, characterized in that, The charging influence parameter value further includes: the ambient temperature of the environment where the power battery is located; Before determining the second battery temperature of the power battery at the second moment, the following steps are further included: Based on the ambient temperature of the environment where the power battery is located and the first battery temperature, determine the heat exchange temperature transferred by the power battery to the environment where the power battery is located within the time step; The step of determining the second battery temperature of the power battery at the second moment based on the first battery temperature and the heat generated by charging itself includes: Based on the first battery temperature, the heat generated by charging itself, and the heat exchange temperature, determine the second battery temperature of the power battery at the second moment.

6. The method according to claim 5, characterized in that, Before determining the second battery temperature of the power battery at the second moment, the following steps are further included: Determine the heating temperature generated by the power battery within the time step due to the heating of the heating module in the electric vehicle; The step of determining the second battery temperature of the power battery at the second moment based on the first battery temperature, the heat generated by charging itself, and the heat exchange temperature includes: Determine the sum of the first battery temperature, the heat generated by charging itself, the heat exchange temperature, and the heating temperature as the second battery temperature of the power battery at the second moment.

7. A method for determining the remaining charging time of an electric vehicle, characterized in that, It includes: Obtain the charging influence parameter values of the power battery of the electric vehicle at the current moment, where the charging influence parameter values include: the current state of charge of the power battery, the current battery temperature of the power battery, and the maximum charging current of the charging pile; Based on the configured charging time correspondence table, query the target remaining charging time corresponding to the current state of charge, the current battery temperature, and the maximum charging current of the charging pile, and determine the target remaining charging time as the remaining charging time of the power battery; Among them, the charging time correspondence table stores the remaining charging time corresponding to each of multiple groups of candidate charging influence parameter values. Among them, each group of candidate charging influence parameter values includes: the candidate state of charge of the power battery, the candidate battery temperature of the power battery, and the candidate maximum charging current of the charging pile, and at least one of the candidate state of charge, the candidate battery temperature, and the candidate maximum charging current is different in different groups of candidate charging influence parameter values; Among them, the remaining charging time corresponding to each group of candidate charging influence parameter values is determined by the following method: Set the moment when the candidate charging influence parameter values are obtained as the first moment, the candidate state of charge as the first state of charge at the first moment, and the candidate battery temperature of the power battery as the first battery temperature at the first moment; Based on the first state of charge, the first battery temperature, and the candidate maximum charging current of the charging pile, determine the charging current of the power battery; Based on the charging current and the first battery temperature, determine the second battery temperature and the second state of charge of the power battery at the second moment, where the second moment is the moment reached after delaying a set time step from the first moment; Add the set cumulative time to the time step, where the initial value of the cumulative time is 0; If the second state of charge is not 100%, set the second moment as the updated first moment, set the second battery temperature as the first battery temperature of the power battery at the updated first moment, set the second state of charge as the second state of charge at the updated first moment, and return to perform the operation of determining the charging current of the power battery; If the second state of charge is 100%, determine the cumulative time as the remaining charging time of the power battery, and obtain the remaining charging time corresponding to the candidate charging influence parameter.

8. A device for determining the remaining charging time of an electric vehicle, characterized in that, Comprising: A parameter acquisition unit for acquiring the value of the charging influence parameter of the power battery of an electric vehicle at the current moment, where the value of the charging influence parameter at least includes: the current state of charge of the power battery, the current battery temperature of the power battery, and the maximum charging current of the charging pile; An information setting unit for setting the current moment as the first moment, the current state of charge of the power battery as the first state of charge at the first moment, and the current battery temperature of the power battery as the first battery temperature at the first moment; A current determination unit for determining the charging current of the power battery based on the first state of charge, the first battery temperature, and the maximum charging current of the charging pile; A state prediction unit for determining the second battery temperature and the second state of charge of the power battery at the second moment based on the charging current and the first battery temperature, where the second moment is the moment reached by delaying a set time step backward from the first moment; A time accumulation unit for adding the set time step to the set cumulative time, where the initial value of the cumulative time is 0; A loop update unit for, if the second state of charge is not 100%, setting the second moment as the updated first moment, setting the second battery temperature as the first battery temperature of the power battery at the updated first moment, setting the second state of charge as the first state of charge at the updated first moment, and returning to perform the operation of determining the charging current of the power battery; A time determination unit for, if the second state of charge is 100%, determining the cumulative time as the remaining charging time of the power battery.

9. A device for determining the remaining charging time of an electric vehicle, characterized in that, Comprising: A parameter acquisition unit for acquiring the value of the charging influence parameter of the power battery of an electric vehicle at the current moment, where the value of the charging influence parameter includes: the current state of charge of the power battery, the current battery temperature of the power battery, and the maximum charging current of the charging pile; A remaining time query unit for querying the target remaining charging time corresponding to the current state of charge, the current battery temperature, and the maximum charging current of the charging pile based on the configured charging time correspondence table, and determining the target remaining charging time as the remaining charging time of the power battery; Among them, the charging time correspondence table stores the remaining charging times corresponding to multiple sets of candidate charging influence parameter values. Each set of candidate charging influence parameter values includes: the candidate state of charge of the power battery, the candidate battery temperature of the power battery, and the candidate maximum charging current of the charging pile, and at least one of the candidate state of charge, candidate battery temperature, and candidate maximum charging current is different in different sets of candidate charging influence parameter values; Among them, the remaining charging time corresponding to each set of candidate charging influence parameter values is determined by the following method: Set the moment when the candidate charging influence parameter values are obtained as the first moment, the candidate state of charge as the first state of charge at the first moment, and the candidate battery temperature of the power battery as the first battery temperature at the first moment; Based on the first state of charge, the first battery temperature, and the candidate maximum charging current of the charging pile, determine the charging current of the power battery; Based on the charging current and the first battery temperature, determine the second battery temperature and the second state of charge of the power battery at the second moment. The second moment is the moment reached by delaying a set time step backward from the first moment; Add the set cumulative time to the time step. The initial value of the cumulative time is 0; If the second state of charge is not 100%, set the second moment as the updated first moment, set the second battery temperature as the first battery temperature of the power battery at the updated first moment, set the second state of charge as the second state of charge at the updated first moment, and return to execute the operation of determining the charging current of the power battery; If the second state of charge is 100%, determine the cumulative time as the remaining charging time of the power battery to obtain the remaining charging time corresponding to the candidate charging influence parameter.

10. A battery management system, characterized in that, It includes: A controller and a memory; The controller is used to execute the method for determining the remaining charging time of the electric vehicle according to any one of claims 1 to 6 or claim 7 above; The memory is used to store the program required for the controller to execute operations.

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