A method, device and automobile for determining a remaining charging time of a battery

Abstract

The application provides a battery remaining charging time determination method, device and automobile, and solves the technical problem of inaccurate remaining charging time estimation of an existing high-voltage platform vehicle when charging at a low-voltage charging pile. The method comprises: in the case of identifying that the charging pile is a low-voltage charging pile, determining the current output capacity of a fast charging voltage boosting module according to the output capacity change of the fast charging voltage boosting module; determining the equivalent charging capacity after voltage boosting according to the current output capacity of the fast charging voltage boosting module and the output capacity of the charging pile; and determining the battery remaining charging time according to the equivalent charging capacity after voltage boosting. The scheme of the application makes the remaining charging time estimation of the high-voltage platform vehicle when charging at the low-voltage charging pile more reasonable and accurate.

Description

Technical Field

[0001] This application relates to the field of automotive technology, and in particular to a method, apparatus, and vehicle for determining the remaining charging time of a battery. Background Technology

[0002] 800V high-voltage platform power batteries for pure electric vehicles are increasingly used in various models due to their advantages such as low current, high efficiency, and fast charging speed. However, there are still many low-voltage platform charging stations on the market, which raises the issue of voltage compatibility. Currently, many low-voltage 500V platform charging stations on the market generally use fast-charging boost modules to increase the voltage and decrease the current to charge the high-voltage power batteries.

[0003] For users, the remaining charging time of new energy vehicles is a crucial parameter, allowing them to plan their trips accordingly. Currently, most new energy vehicles on the market estimate their remaining charging time based on the charging station's capacity. This method is relatively accurate for high-voltage platform models charging at high-voltage charging stations, but inaccurate for low-voltage charging stations. Some new energy vehicles estimate the remaining charging time based on the actual current. However, due to factors such as the unstable output of fast-charging boost modules, the actual charging current fluctuates continuously, causing the remaining charging time to jump around, making it impossible for users to obtain an accurate remaining charging time. Summary of the Invention

[0004] The technical objective of this application is to provide a method, apparatus, and vehicle for determining the remaining charging time of a battery, in order to solve the technical problem that the remaining charging time of existing high-voltage platform vehicles is not accurately estimated when charging at low-voltage charging piles.

[0005] To address the aforementioned technical problems, embodiments of this application provide, including:

[0006] When the charging pile is identified as a low-voltage charging pile, the current output capacity of the fast charging boost module is determined based on the changes in the output capacity of the fast charging boost module.

[0007] Based on the current output capability of the fast charging boost module and the output capability of the charging pile, determine the equivalent charging capability after boosting;

[0008] The remaining charging time of the battery is determined based on the equivalent charging capacity after the voltage boost.

[0009] Optionally, determining the current output capability of the fast charging boost module based on changes in its output capability includes:

[0010] The initial output capability of the fast charging boost module is obtained as the current output capability;

[0011] Monitor the output capability changes of the fast charging boost module in real time or periodically;

[0012] Whenever the change in the output capability of the fast charging boost module meets the predetermined reset conditions, the output capability of the latest fast charging boost module will be reset to the current output capability.

[0013] Optionally, resetting the output capability of the fast-charging boost module to the current output capability whenever the change in the output capability of the fast-charging boost module meets a predetermined reset condition includes:

[0014] Whenever the output capability of the fast charging boost module changes by a percentage exceeding a first predetermined percentage and the change time exceeds a first predetermined time, the output capability of the latest fast charging boost module is reset to the current output capability.

[0015] Optionally, determining the equivalent charging capacity after boosting based on the current output capacity of the fast charging boost module and the output capacity of the charging pile includes:

[0016] Obtain the minimum value between the current output capability of the fast charging boost module and the output capability of the charging pile, and determine the minimum value as the limited output capability after boosting;

[0017] Based on the limited output capability after boosting, the equivalent charging capability after boosting is determined.

[0018] Optionally, determining the equivalent charging capability after boosting based on the limited output capability after boosting includes:

[0019] Obtain the ratio of the boosted output limit to the battery's rated voltage, and determine the ratio as the boosted equivalent charging capacity.

[0020] Optionally, the output capability includes maximum output power.

[0021] Optionally, determining the remaining battery charging time based on the boosted equivalent charging capacity includes:

[0022] Based on the equivalent charging capacity after voltage boost, determine the average temperature rise rate during battery heating and the average charging current of the battery in each charging stage.

[0023] The remaining charging time of the battery is determined based on the average temperature rise rate during battery heating and the average charging current of the battery in each charging stage.

[0024] Optionally, the method further includes:

[0025] Obtain the charging capability of the charging station, including its highest output voltage;

[0026] Based on the highest output voltage of the charging pile, the charging pile can be identified as a high-voltage charging pile or a low-voltage charging pile.

[0027] Optionally, the method further includes:

[0028] When the charging pile is identified as a high-voltage charging pile, the average temperature rise rate during battery heating and the average charging current of the battery in each charging stage are determined based on the charging capacity of the charging pile.

[0029] The remaining charging time of the battery is determined based on the average temperature rise rate during battery heating and the average charging current of the battery in each charging stage.

[0030] Optionally, determining the remaining charging time of the battery based on the average temperature rise rate during battery heating and the average charging current of the battery in each charging stage includes:

[0031] Obtain the battery heating cutoff temperature threshold and the initial minimum battery temperature;

[0032] Obtain the battery state of charge (SOC) for each charging stage and the initial battery SOC for each charging stage.

[0033] The remaining charging time of the battery is determined based on the battery heating cutoff temperature threshold, the initial minimum battery temperature, the average temperature rise rate during battery heating, the state of charge (SOC) of the battery in each charging stage, the initial SOC of the battery in each charging stage, and the average charging current of the battery in each charging stage.

[0034] This application also provides a device for determining the remaining charging time of a battery, comprising:

[0035] The first determining module is used to determine the current output capability of the fast charging boost module based on the change in the output capability of the fast charging boost module when the charging pile is identified as a low-voltage charging pile.

[0036] The second determining module is used to determine the equivalent charging capacity after voltage boosting based on the current output capacity of the fast charging boost module and the output capacity of the charging pile.

[0037] The third determining module is used to determine the remaining charging time of the battery based on the equivalent charging capacity after the voltage boost.

[0038] This application also provides a vehicle, including the battery remaining charging time determination device as described above.

[0039] Compared with the prior art, the method for determining the remaining charging time of a battery provided in this application has at least the following beneficial effects:

[0040] The method for determining the remaining charging time of a battery provided in this application reasonably determines the current output capacity of the fast-charging boost module based on the changes in the output capacity of the fast-charging boost module during low-voltage charging. This avoids frequent jumps and identifies the equivalent charging capacity of the fast-charging boost module. The remaining charging time is calculated using the equivalent charging capacity. Compared with directly estimating the charging pile's output capacity, this method is more in line with the actual situation, making the final determined remaining charging time more reasonable and accurate. It solves the problem of inaccurate estimation of the remaining charging time of low-voltage charging piles for high-voltage platform vehicles and achieves compatibility of remaining charging time estimation for high-voltage platform vehicles with both high-voltage charging piles and commonly available low-voltage charging piles. Attached Figure Description

[0041] Figure 1 A flowchart illustrating the method for determining the remaining charging time of a battery provided in an embodiment of this application;

[0042] Figure 2 Another flowchart illustrating the method for determining the remaining charging time of a battery provided in an embodiment of this application;

[0043] Figure 3 A schematic diagram of the structure of the battery remaining charging time determination device provided in the embodiments of this application. Detailed Implementation

[0044] To make the technical problems, technical solutions, and advantages of this application clearer, a detailed description will be provided below in conjunction with the accompanying drawings and specific embodiments. In the following description, specific details such as particular configurations and components are provided merely to aid in a comprehensive understanding of the embodiments of this application. Therefore, those skilled in the art should understand that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of this application. Furthermore, for clarity and brevity, descriptions of known functions and structures have been omitted.

[0045] It should be understood that the phrase "one embodiment" or "an embodiment" throughout the specification means that a specific feature, structure, or characteristic related to the embodiment is included in at least one embodiment of this application. Therefore, "in one embodiment" or "in an embodiment" appearing throughout the specification does not necessarily refer to the same embodiment. Furthermore, these specific features, structures, or characteristics can be combined in any suitable manner in one or more embodiments.

[0046] In the various embodiments of this application, it should be understood that the sequence number of each process described below does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0047] It should be understood that the term "and / or" in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0048] In the embodiments provided in this application, it should be understood that "B corresponding to A" means that B is associated with A, and B can be determined based on A. However, it should also be understood that determining B based on A does not mean determining B solely based on A; B can also be determined based on A and / or other information.

[0049] See Figure 1 As shown, a preferred embodiment of this application provides a method for determining the remaining charging time of a battery, including:

[0050] Step 11: If the charging pile is identified as a low-voltage charging pile, determine the current output capacity of the fast charging boost module based on the changes in the output capacity of the fast charging boost module.

[0051] Here, the high-voltage platform vehicle is equipped with a fast-charging boost module. When a low-voltage charging pile is detected, the output capacity of the fast-charging boost module may fluctuate due to faults or charging pile limitations. The controller (or other functional units can be used as the execution subject) can comprehensively balance the changes in the output capacity of the fast-charging boost module, taking into account whether the remaining charging time fluctuates frequently or not due to the fluctuations in the output capacity of the fast-charging boost module, and reasonably determine the current output capacity of the fast-charging boost module used to calculate the remaining charging time.

[0052] Optionally, a high-voltage charging pile refers to a charging pile with a charging voltage greater than or equal to a preset voltage, while a low-voltage charging pile refers to a charging pile with a charging voltage less than a preset voltage.

[0053] Step 12: Determine the equivalent charging capacity after boosting based on the current output capacity of the fast charging boost module and the output capacity of the charging pile.

[0054] Here, compared to directly using the charging pile's output capacity to estimate the remaining charging time, this step takes into account both the current output capacity of the fast charging boost module and the output capacity of the charging pile, determining that the equivalent charging capacity after boosting is more in line with the actual situation, making the estimation of the remaining charging time more reasonable and accurate.

[0055] Step 13: Determine the remaining charging time of the battery based on the equivalent charging capacity after the boost.

[0056] Here, the remaining charging time determined by using the equivalent charging capacity after voltage boost is more reasonable and accurate, and can avoid frequent jumps, thus improving the user experience.

[0057] While high-voltage platform vehicles are becoming increasingly common, many low-voltage platform charging stations still exist on the market. When charging at low-voltage charging stations, directly estimating the remaining charging time using the station's capacity leads to significant errors. The battery remaining charging time determination method provided in this application addresses this issue. During low-voltage charging, the method rationally determines the current output capacity of the fast-charging boost module based on its output capacity changes, avoiding frequent fluctuations. It then identifies the equivalent charging capacity of the fast-charging boost module and calculates the remaining charging time using this equivalent capacity. This method is more realistic than directly estimating using the charging station's output capacity, resulting in a more reasonable and accurate final remaining charging time. It solves the problem of inaccurate remaining charging time estimation for high-voltage platform vehicles using low-voltage charging stations, achieving compatibility between high-voltage charging stations and commonly available low-voltage charging stations.

[0058] In some embodiments of this application, step 11 may optionally include:

[0059] Step 111: Obtain the initial output capability of the fast charging boost module as the current output capability.

[0060] Here, the output capability of the fast-charging boost module can be obtained via the vehicle's CAN (Controller Area Network) through the controller (or other functional units). Since fast-charging boost modules generally provide constant power output, their output capability typically refers to their maximum output power, a relatively stable value that can fluctuate due to faults or charging station limitations. In this step, obtaining the initial output capability of the fast-charging boost module includes obtaining its maximum output power in the initial state.

[0061] Although not explicitly stated in this application, those skilled in the art should understand that, in addition to the maximum output power of the fast charging boost module, other reasonable parameters can also be used to determine the output capability of the fast charging boost module.

[0062] Step 112: Monitor the changes in the output capability of the fast charging boost module in real time or periodically.

[0063] Step 113: Whenever the change in the output capability of the fast charging boost module meets the predetermined reset conditions, the latest output capability of the fast charging boost module is reset to the current output capability.

[0064] Here, the output capability (including the maximum output power) of the fast-charging boost module can be monitored in real time or periodically. When a fault or charging station limitation causes a significant change in the output capability of the fast-charging boost module, and the change meets predetermined reset conditions, the output capability (including the maximum output power) of the fast-charging boost module will be reset. The predetermined reset conditions can comprehensively consider whether the remaining charging time frequently changes or remains unchanged due to changes in the output capability (including the maximum output power) of the fast-charging boost module. The current output capability of the fast-charging boost module can be cached in an appropriate location for easy retrieval.

[0065] Specifically, as an optional implementation, step 113 above includes:

[0066] Step 1131: Whenever the output capability change ratio of the fast charging boost module exceeds the first predetermined ratio and the change time exceeds the first predetermined time, the latest output capability of the fast charging boost module is reset to the current output capability.

[0067] Here, a predetermined reset condition is met only when the change in the output capability (including the maximum output power) of the fast-charging boost module exceeds a first predetermined ratio K1 and the duration exceeds a first predetermined time T1. The current output capability (including the maximum output power) of the fast-charging boost module is then reset, thereby controlling the reset process and preventing frequent jumps. The values ​​of K1 and T1 are determined by comprehensively balancing the scenarios where the remaining charging time frequently jumps or does not jump due to changes in the output capability (including the maximum output power) of the fast-charging boost module.

[0068] During the charging process, the remaining charging time can be recalculated each time the current output capacity of the fast charging boost module is reset, or the remaining charging time can be calculated in real time or periodically without considering the reset of the current output capacity of the fast charging boost module. The remaining charging time can be sent to the charging pile, vehicle instrument panel, central control unit, and user terminals (such as mobile phones, smartwatches, etc.) for display in real time or periodically until charging is completed.

[0069] In some embodiments of this application, step 12 may optionally include:

[0070] Step 121: Obtain the minimum value between the current output capability of the fast charging boost module and the output capability of the charging pile, and determine the minimum value as the limited output capability after boosting.

[0071] Here, after the controller (or other functional unit) determines that there is a fast charging boost demand, the actual input current of the power battery is the output current of the fast charging boost module. The fast charging boost module can be regarded as part of the charging pile. The charging capacity limitation is divided into the charging pile output capacity limitation and the fast charging boost module output capacity limitation. The formula for calculating the limited output capacity after boosting is as follows:

[0072] The limited output capacity after boosting = min(output capacity of charging pile, output capacity of fast charging boost module) (1).

[0073] Among them, the current output capability of the fast charging boost module may include the maximum output power of the fast charging boost module currently cached, the output capability of the charging pile may include the maximum output power of the charging pile, and the limited output capability after boosting may include the maximum output power after boosting (also known as the maximum charging power after boosting) calculated using formula (1).

[0074] The output capacity of the charging pile, i.e., its maximum output power, can be calculated using the following formula:

[0075] The maximum output power of the charging pile = the maximum output voltage of the charging pile * the maximum output current of the charging pile (2).

[0076] The charging pile's maximum output voltage and maximum output current are both contained in the charging pile's charging capacity message, and can be obtained when the controller (or other functional unit) initiates charging communication with the charging pile.

[0077] Although not explicitly stated in this application, those skilled in the art should understand that, in addition to the maximum output power of the charging pile and the maximum output power after voltage boosting, other reasonable parameters can also be used for the output capacity of the charging pile and the limited output capacity after voltage boosting.

[0078] Step 122: Determine the equivalent charging capacity after boosting based on the limited output capacity after boosting.

[0079] Here, when the high-voltage charging pile is charging, the remaining charging time is calculated based on the charging pile's capacity; when the low-voltage charging pile is charging, this application uses the limited output capacity after voltage boosting (including the maximum charging power after voltage boosting) to determine the equivalent charging capacity after voltage boosting, and determines the remaining charging time based on the equivalent charging capacity, which is more in line with the actual situation and the calculated remaining charging time is more accurate.

[0080] Specifically, as an optional implementation, step 122 above includes:

[0081] Step 1221: Obtain the ratio of the limited output capability after boosting to the rated voltage of the battery, and determine the ratio as the equivalent charging capability after boosting.

[0082] Here, the formula for calculating the equivalent charging capacity after voltage boost is as follows:

[0083] Equivalent charging capacity after boosting = Limited output capacity after boosting / Rated battery voltage (3).

[0084] Among them, the rated voltage of the battery refers to the nominal voltage of the power battery, which represents the characteristic parameters of batteries made of different materials.

[0085] In some embodiments of this application, step 13 may optionally include:

[0086] Step 131: Based on the equivalent charging capacity after voltage boost, determine the average temperature rise rate during battery heating and the average charging current of the battery in each charging stage;

[0087] Step 132: Determine the remaining charging time of the battery based on the average temperature rise rate during battery heating and the average charging current of the battery in each charging stage.

[0088] At this point, after obtaining the equivalent charging capacity after boosting, the controller (or other functional unit) estimates and confirms VTavg and Iavg based on the equivalent charging capacity. VTavg = the average temperature rise rate when the battery is heated, and Iavg = the average charging current of the battery in each charging stage. Based on this, the remaining charging time of the battery is calculated.

[0089] In some embodiments of this application, optionally, it also includes:

[0090] Step 1001: Obtain the charging capability of the charging pile, including the highest output voltage of the charging pile.

[0091] Here, when charging is started, the vehicle and the charging station communicate via CAN. The vehicle can obtain the charging station's charging capabilities, such as CML (Charger Maximum Lab), which includes the charging station's highest output voltage.

[0092] Step 1002: Identify whether the charging pile is a high-voltage charging pile or a low-voltage charging pile based on the highest output voltage of the charging pile.

[0093] Here, the highest output voltage of the charging pile can be used to identify whether it is a high-voltage or low-voltage charging pile. For example, when the controller (or other functional unit) identifies that the highest output voltage of the charging pile is ≥700V (which can be calibrated according to the highest charging voltage parameter of the vehicle's power battery), it determines that the charging pile is a high-voltage charging pile; when the highest output voltage of the charging pile is <700V (which can be calibrated according to the highest charging voltage parameter of the vehicle's power battery), it determines that the charging pile is a low-voltage charging pile. After identifying the low-voltage charging pile, the controller (or other functional unit) needs to send a fast charging boost request.

[0094] In some embodiments of this application, optionally, it also includes:

[0095] Step 1003: If the charging pile is identified as a high-voltage charging pile, determine the average temperature rise rate during battery heating and the average charging current of the battery in each charging stage based on the charging capacity of the charging pile.

[0096] Step 1004: Determine the remaining charging time of the battery based on the average temperature rise rate during battery heating and the average charging current of the battery in each charging stage.

[0097] At this point, after obtaining the charging capacity of the high-voltage charging pile (such as CML), the controller (or other functional unit) estimates and confirms VTavg and Iavg based on the charging capacity of the charging pile. VTavg = the average temperature rise rate when the battery is heated, and Iavg = the average charging current of the battery in each charging stage. Based on this, the remaining charging time of the battery is calculated.

[0098] Regardless of whether it is charging at a high-voltage charging station or a low-voltage charging station, once Vtavg and Iavg are determined, the remaining charging time can be estimated by combining parameters such as the current remaining power battery SOC and power battery temperature.

[0099] That is, step 132 or step 1004 above may include:

[0100] Step 15: Obtain the battery heating cutoff temperature threshold and the initial minimum battery temperature.

[0101] Step 16: Obtain the battery state of charge (SOC) for each charging stage and the initial battery state of charge (SOC) for each charging stage.

[0102] Step 17: Determine the remaining charging time of the battery based on the battery heating cutoff temperature threshold, the initial minimum battery temperature, the average temperature rise rate during battery heating, the battery state of charge (SOC) of each charging stage, the initial SOC of each charging stage, and the average charging current of each charging stage.

[0103] At this point, the remaining battery charging time can be calculated using the following formula:

[0104] t=(Ts-T0) / VTavg+∑(SOC(i+1)-SOCi)*C / Iavg(4).

[0105] Where Ts = battery heating cutoff temperature threshold; T0 = initial minimum battery temperature; VTavg = average temperature rise rate during battery heating; SOC(i+1) = battery SOC for each charging stage; SOCi = initial battery SOC for each charging stage; C = maximum usable battery capacity; Iavg = average charging current for each charging stage. VTavg and Iavg are affected by the actual charging current of the battery and vary depending on the charging pile's capacity, requiring calibration based on actual conditions.

[0106] The following is a specific application example illustrating this application:

[0107] like Figure 2 As shown, the method for determining the remaining charging time of a battery according to an embodiment of this application includes:

[0108] S21: Start charging.

[0109] S22: Obtain the charging capability of the charging station, such as CML, which includes the highest output voltage of the charging station.

[0110] S23: Determine whether the charging pile is a low-voltage charging pile. If yes, proceed to S24; otherwise, proceed to S28.

[0111] S24: Obtain the current output capability of the fast charging boost module. For details, please refer to the section on step 11 above. It will not be repeated here.

[0112] S25: Determine the equivalent charging capacity after boosting based on the current output capacity of the fast charging boost module and the output capacity of the charging pile. For details, please refer to the section on step 12 above, which will not be repeated here.

[0113] S26: Determine the remaining charging time of the battery based on the equivalent charging capacity after boosting. For details, please refer to the section on step 13 above. It will not be repeated here.

[0114] S27: Determine if charging is complete. If yes, proceed to S210; otherwise, return to S24.

[0115] S28: Determine the remaining charging time of the battery based on the charging capacity of the charging station. For details, please refer to the section on steps 1003-1004 above. It will not be repeated here.

[0116] S29: Determine whether charging is complete. If yes, proceed to S210; otherwise, return to S28.

[0117] S210: Charging complete.

[0118] The method for determining the remaining charging time of a battery provided in this application, when using a low-voltage charging pile for boost charging, reasonably determines the current output capacity of the fast-charging boost module based on the changes in its output capacity, avoiding frequent jumps, and identifies the equivalent charging capacity of the fast-charging boost module accordingly. The remaining charging time is then calculated using the equivalent charging capacity. Compared to directly estimating using the output capacity of the charging pile, this method is more in line with the actual situation, making the final determined remaining charging time more reasonable and accurate. This solves the problem of inaccurate estimation of the remaining charging time of low-voltage charging piles for high-voltage platform vehicles, and achieves compatibility of remaining charging time estimation for high-voltage platform vehicles with both high-voltage charging piles and commonly available low-voltage charging piles.

[0119] See Figure 3 As shown in the figure, this application embodiment also provides a battery remaining charging time determination device 300, including:

[0120] The first determining module 301 is used to determine the current output capability of the fast charging boost module based on the change in the output capability of the fast charging boost module when the charging pile is identified as a low-voltage charging pile.

[0121] The second determining module 302 is used to determine the equivalent charging capacity after boosting based on the current output capacity of the fast charging boost module and the output capacity of the charging pile.

[0122] The third determining module 303 is used to determine the remaining charging time of the battery based on the equivalent charging capacity after the boost.

[0123] The battery remaining charging time determination device 300 provided in this application embodiment, when charging at a low-voltage charging pile, reasonably determines the current output capacity of the fast charging boost module based on the changes in the output capacity of the fast charging boost module, avoiding frequent jumps, and identifies the equivalent charging capacity of the fast charging boost module accordingly. It calculates the remaining charging time using the equivalent charging capacity, which is more in line with the actual situation than directly estimating using the output capacity of the charging pile. This makes the final determined remaining charging time more reasonable and accurate, solves the problem of inaccurate estimation of the remaining charging time of low-voltage charging piles for high-voltage platform vehicles, and realizes that the estimation of the remaining charging time of high-voltage platform vehicles is compatible with both high-voltage charging piles and commonly used low-voltage charging piles on the market.

[0124] Optionally, the first determining module 301 includes:

[0125] The first acquisition submodule is used to acquire the initial output capability of the fast charging boost module as the current output capability;

[0126] The monitoring submodule is used to monitor the changes in the output capability of the fast-charging boost module in real time or periodically.

[0127] The reset submodule is used to reset the output capability of the fast charging boost module to the current output capability whenever the change in the output capability of the fast charging boost module meets the predetermined reset conditions.

[0128] Optionally, the reset submodule includes:

[0129] The reset unit is used to reset the output capability of the latest fast charging boost module to the current output capability whenever the change ratio of the output capability of the fast charging boost module exceeds a first predetermined ratio and the change time exceeds a first predetermined time.

[0130] Optionally, the second determining module 302 includes:

[0131] The first determining submodule is used to obtain the minimum value between the current output capability of the fast charging boost module and the output capability of the charging pile, and to determine the minimum value as the limited output capability after boosting;

[0132] The second determining submodule is used to determine the equivalent charging capacity after boosting based on the limited output capacity after boosting.

[0133] Optionally, the second determining submodule includes:

[0134] The first determining unit is used to obtain the ratio of the limited output capability after boosting to the rated voltage of the battery, and to determine the ratio as the equivalent charging capability after boosting.

[0135] Optional, output capability includes maximum output power.

[0136] Optionally, the third determining module 303 includes:

[0137] The third determining submodule is used to determine the average temperature rise rate during battery heating and the average charging current of the battery in each charging stage based on the equivalent charging capacity after the boost.

[0138] The fourth determining submodule is used to determine the remaining charging time of the battery based on the average temperature rise rate during battery heating and the average charging current of the battery in each charging stage.

[0139] Optionally, the device further includes:

[0140] The first acquisition module is used to acquire the charging capability of the charging pile, including the highest output voltage of the charging pile;

[0141] The identification module is used to identify whether the charging pile is a high-voltage charging pile or a low-voltage charging pile based on the highest output voltage of the charging pile.

[0142] Optionally, the device further includes:

[0143] The fourth determining module is used to determine the average temperature rise rate during battery heating and the average charging current of the battery in each charging stage, based on the charging capacity of the charging pile, when the charging pile is identified as a high-voltage charging pile.

[0144] The fifth determining module is used to determine the remaining charging time of the battery based on the average temperature rise rate during battery heating and the average charging current of the battery in each charging stage.

[0145] Optionally, the fourth or fifth determining submodule is specifically used for:

[0146] Obtain the battery heating cutoff temperature threshold and the initial minimum battery temperature; obtain the battery state of charge (SOC) for each charging stage and the initial SOC for each charging stage; determine the remaining charging time of the battery based on the battery heating cutoff temperature threshold, the initial minimum battery temperature, the average temperature rise rate during battery heating, the battery SOC for each charging stage, the initial SOC for each charging stage, and the average charging current of the battery for each charging stage.

[0147] The battery remaining charging time determination device 300 provided in this application embodiment, when charging at a low-voltage charging pile, reasonably determines the current output capacity of the fast charging boost module based on the changes in the output capacity of the fast charging boost module, avoiding frequent jumps, and identifies the equivalent charging capacity of the fast charging boost module accordingly. It calculates the remaining charging time using the equivalent charging capacity, which is more in line with the actual situation than directly estimating using the output capacity of the charging pile. This makes the final determined remaining charging time more reasonable and accurate, solves the problem of inaccurate estimation of the remaining charging time of low-voltage charging piles for high-voltage platform vehicles, and realizes that the estimation of the remaining charging time of high-voltage platform vehicles is compatible with both high-voltage charging piles and commonly used low-voltage charging piles on the market.

[0148] It should be noted that the embodiment of the battery remaining charging time determination device in this application is a device corresponding to the embodiment of the battery remaining charging time determination method described above. All implementation means in the above method embodiment are applicable to the embodiment of this device and can achieve the same technical effect.

[0149] This application also provides a vehicle, including the battery remaining charging time determination device as described above.

[0150] It should be noted that all the implementation methods in the above-described embodiments of the battery remaining charging time determination device are applicable to the embodiments of this vehicle and can achieve the same technical effect.

[0151] Furthermore, reference numerals and / or letters may be repeated in different examples within this application. Such repetition is for the purpose of simplification and clarity and does not in itself indicate a relationship between the various embodiments and / or settings discussed.

[0152] It should also be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion.

[0153] The above description is the preferred embodiment of this application. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principles described in this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. A method for determining the remaining charging time of a battery, characterized in that, include: When the charging pile is identified as a low-voltage charging pile, the current output capacity of the fast charging boost module is determined based on the changes in the output capacity of the fast charging boost module. Based on the current output capability of the fast charging boost module and the output capability of the charging pile, determine the equivalent charging capability after boosting; The remaining charging time of the battery is determined based on the equivalent charging capacity after the voltage boost. The step of determining the current output capability of the fast charging boost module based on changes in its output capability includes: The initial output capability of the fast charging boost module is obtained as the current output capability; Monitor the output capability changes of the fast charging boost module in real time or periodically; Whenever the output capability of the fast charging boost module changes by a percentage exceeding a first predetermined percentage and the change time exceeds a first predetermined time, the output capability of the latest fast charging boost module is reset to the current output capability. The step of determining the equivalent charging capacity after boosting based on the current output capacity of the fast charging boost module and the output capacity of the charging pile includes: Obtain the minimum value between the current output capability of the fast charging boost module and the output capability of the charging pile, and determine the minimum value as the limited output capability after boosting; Obtain the ratio of the boosted output limit to the battery rated voltage, and determine the ratio as the boosted equivalent charging capacity; The output capability includes the maximum output power.

2. The method for determining the remaining charging time of a battery according to claim 1, characterized in that, Determining the remaining battery charging time based on the equivalent charging capacity after voltage boosting includes: Based on the equivalent charging capacity after voltage boost, determine the average temperature rise rate during battery heating and the average charging current of the battery in each charging stage. The remaining charging time of the battery is determined based on the average temperature rise rate during battery heating and the average charging current of the battery in each charging stage.

3. The method for determining the remaining charging time of a battery according to claim 1, characterized in that, The method further includes: Obtain the charging capability of the charging station, including its highest output voltage; Based on the highest output voltage of the charging pile, the charging pile can be identified as a high-voltage charging pile or a low-voltage charging pile.

4. The method for determining the remaining charging time of a battery according to claim 1, characterized in that, The method further includes: When the charging pile is identified as a high-voltage charging pile, the average temperature rise rate during battery heating and the average charging current of the battery in each charging stage are determined based on the charging capacity of the charging pile. The remaining charging time of the battery is determined based on the average temperature rise rate during battery heating and the average charging current of the battery in each charging stage.

5. The method for determining the remaining charging time of a battery according to claim 2 or 4, characterized in that, The step of determining the remaining charging time of the battery based on the average temperature rise rate during battery heating and the average charging current of the battery in each charging stage includes: Obtain the battery heating cutoff temperature threshold and the initial minimum battery temperature; Obtain the battery state of charge (SOC) for each charging stage and the initial battery SOC for each charging stage. The remaining charging time of the battery is determined based on the battery heating cutoff temperature threshold, the initial minimum battery temperature, the average temperature rise rate during battery heating, the state of charge (SOC) of the battery in each charging stage, the initial SOC of the battery in each charging stage, and the average charging current of the battery in each charging stage.

6. A device for determining the remaining charging time of a battery, characterized in that, include: The first determining module is used to determine the current output capability of the fast charging boost module based on the change in the output capability of the fast charging boost module when the charging pile is identified as a low-voltage charging pile. The second determining module is used to determine the equivalent charging capacity after voltage boosting based on the current output capacity of the fast charging boost module and the output capacity of the charging pile. The third determining module is used to determine the remaining charging time of the battery based on the equivalent charging capacity after the boost. Wherein, the first determining module is used for: The initial output capability of the fast charging boost module is obtained as the current output capability; Monitor the output capability changes of the fast charging boost module in real time or periodically; Whenever the output capability of the fast charging boost module changes by a percentage exceeding a first predetermined percentage and the change time exceeds a first predetermined time, the output capability of the latest fast charging boost module is reset to the current output capability. The second determining module is used for: Obtain the minimum value between the current output capability of the fast charging boost module and the output capability of the charging pile, and determine the minimum value as the limited output capability after boosting; Obtain the ratio of the boosted output limit to the battery rated voltage, and determine the ratio as the boosted equivalent charging capacity; The output capability includes the maximum output power.

7. A car, characterized in that, Includes the device for determining the remaining charging time of a battery as described in claim 6.

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