Power battery state management method and device, medium and vehicle

Abstract

The embodiment of the invention provides a power battery state management method and device, a medium and a vehicle, and relates to the technical field of battery management. The method comprises the steps that when a vehicle is powered off, the battery state of the vehicle at the off-line moment is obtained; and sending the battery state at the off-line moment to an off-line monitoring system, so that the off-line monitoring system performs state monitoring based on the battery state at the off-line moment and a preset battery self-discharge model. According to the embodiment of the invention, the battery state at the off-line moment when the vehicle is powered off is acquired and sent to the off-line monitoring system, so that the off-line monitoring system performs off-line monitoring on the battery state based on the battery self-discharge model, and dual monitoring reminding on the battery state can be realized in combination with a battery on-line monitoring function of a battery management system; and the reliability of static over-discharge risk monitoring of the power battery is effectively improved.

Description

Technical Field

[0001] This application relates to the field of battery management technology, and more specifically, to a method, device, medium, and vehicle for managing the state of a power battery. Background Technology

[0002] When new energy vehicles are not used for extended periods, there is a risk of over-discharge in the power battery, meaning the battery continues to discharge even when its voltage is below the specified value. Therefore, to prevent over-discharge, a monitoring system is needed to monitor and manage the vehicle's battery during periods of inactivity.

[0003] Currently, traditional solutions mainly use a battery management system (BMS) to monitor the battery status. By monitoring the state of charge (SOC) or voltage of the power battery in real time, an alarm is triggered when the voltage falls below a set threshold.

[0004] However, traditional solutions require the battery management system's online monitoring function to be continuously activated. This online monitoring function itself consumes a significant amount of battery power. Furthermore, when the online monitoring function malfunctions or the battery power is insufficient to maintain the online monitoring function, the vehicle will be unable to monitor and alert for the risk of over-discharge of the power battery. Therefore, the reliability of static over-discharge monitoring of the battery is not high. Summary of the Invention

[0005] The purpose of this application is to provide a power battery state management method, device, medium, and vehicle to improve the reliability of power battery static over-discharge risk monitoring.

[0006] In a first aspect, embodiments of this application provide a power battery state management method, including: When the vehicle is powered off, obtain the vehicle's offline battery status; The battery status at the offline time is sent to the offline monitoring system so that the offline monitoring system can perform status monitoring based on the battery status at the offline time and a preset battery self-discharge model.

[0007] In this embodiment, the battery status at the offline moment when the vehicle is powered off is obtained and sent to the offline monitoring system, so that the offline monitoring system can monitor the battery status offline based on the battery self-discharge model. This enables the battery management system to combine the battery online monitoring function to achieve dual monitoring and reminder of battery status, effectively improving the reliability of monitoring the static over-discharge risk of the power battery.

[0008] In some embodiments, the power battery state management method further includes: When the vehicle is powered off, acquire and record the offline parking time and the current first total mileage of the current drive; Based on the offline parking time, the BMS enters sleep mode according to a preset first sleep cycle; wherein, the BMS sleep mode enables battery fault monitoring and undervoltage inspection functions, and disables other battery management functions. The undervoltage inspection function includes: Obtain the real-time voltage of the power battery; When the real-time voltage is lower than the preset discharge cutoff voltage, a low-voltage flag is sent to the remote alert system so that the remote alert system can issue a low-voltage reminder message.

[0009] In this embodiment, a BMS-based periodic sleep mechanism is used to reduce the power consumption of battery status monitoring when the vehicle is stationary, thereby further improving the reliability of power battery static over-discharge risk monitoring.

[0010] In some embodiments, the power battery state management method further includes: After sending a low battery warning to the remote alert system, the system enters a deep sleep mode for the battery management system (BMS); wherein, the deep sleep mode of the BMS retains only the battery thermal runaway fault warning function.

[0011] In this embodiment of the application, by further disabling unnecessary monitoring functions of the BMS after detecting battery undervoltage, the power consumption of battery monitoring can be further reduced.

[0012] In some embodiments, the power battery state management method further includes: After the BMS sleep mode is automatically woken up based on the preset first sleep cycle, the current second total driving mileage and the current second time are obtained; If the second total mileage is equal to the first total mileage, the parking duration is determined based on the difference between the second time and the offline parking time. If the current parking duration does not exceed the preset second sleep cycle, then the system will re-enter the BMS sleep mode; wherein the second sleep cycle is longer than the first sleep cycle. If the parking duration exceeds the preset second sleep cycle, a long-term inactivity flag is sent to the remote alert system so that the remote alert system can issue a timely vehicle usage reminder.

[0013] In this embodiment, a vehicle use reminder is triggered when the parking duration is detected to exceed a preset second sleep cycle, which further improves the reliability of vehicle static over-parking monitoring.

[0014] In some embodiments, the power battery state management method further includes: If the second total mileage is not equal to the first total mileage, the previously recorded first total mileage is updated to the second total mileage, the previously recorded offline parking time is updated to the second time, and the system re-enters BMS sleep mode.

[0015] In this embodiment of the application, when vehicle use is detected during a single sleep cycle, the recorded mileage and parking time are updated, further improving the reliability of vehicle static over-discharge monitoring.

[0016] In some embodiments, the power battery state management method further includes: If the current parking duration exceeds the preset second sleep cycle, obtain the static battery voltage; Determine the self-discharge loss of electricity corresponding to the duration of this parking session; The current state of charge of the power battery is calibrated based on the static battery voltage and the self-discharge loss, to obtain the calibrated battery state of charge. Status monitoring is performed based on the calibrated state of battery charge.

[0017] In this embodiment of the application, when it is detected that the parking time exceeds the preset second dormancy period, the current state of charge is calibrated by the static battery voltage and the self-discharge loss, and the state of charge is monitored based on the calibrated battery state of charge, which further improves the reliability of vehicle static over-discharge monitoring.

[0018] In some embodiments, the state monitoring based on the calibrated battery state of charge includes: If the calibrated state of charge of the battery is lower than a preset first state threshold, determine whether the vehicle is connected to the charging pile and whether the charging pile supports cardless charging. If it is determined that the vehicle is connected to a charging pile and the charging pile supports cardless charging, control the power battery to charge to the preset target level and adjust the temperature of the power battery to reach the preset temperature range. If it is determined that the vehicle is not connected to a charging station or the charging station does not support cardless charging, the vehicle is requested to enter power saving mode; wherein, the power saving mode disables preset functions that consume power battery power when the vehicle is stationary.

[0019] In this embodiment, when the battery level is low, the vehicle is automatically charged or put into power-saving mode, which further improves the reliability of the power battery against static over-discharge risk.

[0020] In some embodiments, the power battery state management method further includes: If the calibrated state of charge of the battery is lower than a preset second state threshold, a low battery indicator is sent to the remote alert system so that the remote alert system issues a charging reminder message; wherein the second state threshold is less than the first state threshold; After sending a low battery warning to the remote alert system, the system enters the BMS low power mode; wherein, the BMS low power mode retains only the battery fault monitoring function.

[0021] In this embodiment, when the battery power is detected to be too low, a charging reminder is triggered and the system further enters the BMS low power mode, thereby further improving the reliability of the power battery against static over-discharge risk.

[0022] In some embodiments, the offline monitoring system is configured to: The current state of charge of the power battery is determined based on the offline battery state and the preset battery self-discharge model. If the current state of charge is lower than a preset third state threshold, the current battery over-discharge risk level is determined to be low risk. If the current state of charge is lower than a preset fourth state threshold, the current battery over-discharge risk level is determined to be medium risk; wherein the fourth state threshold is less than the third state threshold. If the current state of charge is lower than the fourth state threshold and the vehicle is offline for a longer period than a preset time threshold, the current battery over-discharge risk level is determined to be high risk. Determine the response strategy corresponding to the current battery over-discharge risk level, and issue a battery over-discharge warning message based on the determined response strategy.

[0023] In this embodiment of the application, by setting different offline monitoring conditions and triggering different reminder strategies when the corresponding conditions are met, the reliability of the static over-discharge risk of the power battery is further improved.

[0024] Secondly, embodiments of this application provide a power battery state management device, comprising: The status acquisition module is used to acquire the battery status of the vehicle at offline times when the vehicle is powered off. The status monitoring module is used to send the battery status at the offline time to the offline monitoring system, so that the offline monitoring system can perform status monitoring based on the battery status at the offline time and a preset battery self-discharge model.

[0025] Thirdly, embodiments of this application provide an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor, when executing the program, can implement the method described in any embodiment of the first aspect.

[0026] Fourthly, embodiments of this application provide a computer-readable storage medium storing a computer program, which, when executed by a processor, can implement the method described in any embodiment of the first aspect.

[0027] Fifthly, embodiments of this application provide a vehicle including a controller, the controller being configured to execute any of the described power battery state management methods. Attached Figure Description

[0028] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments of this application will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0029] Figure 1 A flowchart illustrating a power battery state management method provided in an embodiment of this application; Figure 2 This is a system architecture diagram of the power battery state management system provided in the embodiments of this application; Figure 3 A flowchart illustrating the timed inspection of static over-discharge protection provided in this application embodiment; Figure 4 This is a flowchart illustrating the undervoltage inspection function provided in the embodiments of this application; Figure 5 This is a schematic diagram of the static over-discharge protection process for a cloud platform provided in an embodiment of this application. Figure 6 This is a schematic diagram of the structure of a power battery state management device provided in an embodiment of this application; Figure 7 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application. Detailed Implementation

[0030] The technical solutions in the embodiments of this application will now be described with reference to the accompanying drawings.

[0031] It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures. Furthermore, in the description of this application, terms such as "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0032] It should be noted that even when a new energy vehicle is parked, its battery will still discharge slowly. This discharge rate is further increased when passive monitoring functions such as Sentry Mode are activated.

[0033] When a power battery continues to discharge even when its voltage is below the specified value, which is known as over-discharge, it will cause irreversible damage to the battery and affect its lifespan.

[0034] To protect new energy vehicles from static over-discharge, existing solutions monitor battery level in real time and automatically activate the range extender / engine to replenish the battery when the level drops to a threshold. However, in enclosed spaces or unattended scenarios, automatic activation of the range extender / engine may pose safety risks, and the emitted fumes could cause environmental pollution or human poisoning. Some solutions use cameras to assist in assessing environmental conditions, but if the vehicle is parked for extended periods and covered by a car cover, the cameras may not be able to capture environmental conditions, and abruptly activating the range extender / engine would still present the same problems. Furthermore, for pure electric vehicles lacking a range extender / engine, the above solutions cannot address the over-discharge issue of the battery.

[0035] In addition, when the vehicle's battery level drops to a certain point, the BMS power supply will be cut off. At this time, the power battery will lose its monitoring function and will no longer be able to perform the power battery over-discharge monitoring and reminder functions, which is not very reliable.

[0036] To address the problems existing in the prior art, this application provides a power battery state management method. By combining online monitoring by the BMS and offline monitoring by a remote system, dual monitoring of the static over-discharge phenomenon of the power battery is achieved, effectively improving the reliability of power battery monitoring.

[0037] like Figure 1 As shown in the figure, this application provides a power battery state management method, which may include the following steps: S1. Obtain the battery status of the vehicle at the offline time when the vehicle is powered off.

[0038] The solution in this application embodiment can be executed by the vehicle's Battery Management System (BMS).

[0039] For example, when the vehicle is parked and powered off, the BMS can obtain the current state of the power battery (the battery state at the offline time), that is, the state of charge of the power battery when the vehicle is parked and powered off.

[0040] S2. Send the battery status at the offline time to the offline monitoring system so that the offline monitoring system can perform status monitoring based on the battery status at the offline time and the preset battery self-discharge model.

[0041] like Figure 2 As shown, an offline monitoring system can be deployed on a server or cloud platform. After obtaining the vehicle's offline battery status, the BMS can send the vehicle's offline battery status to the offline monitoring system.

[0042] For example, after receiving the battery status at the offline time, the offline monitoring system can immediately start offline monitoring based on a preset battery self-discharge model.

[0043] For example, the battery self-discharge model can be represented by the following formula:

[0044] in, Indicates the lost state of charge during the monitoring period; Indicates temperature T The self-discharge rate constant increases with temperature. k The higher the value, the faster the self-discharge. Indicates the time elapsed during the monitoring process (e.g., hours or days).

[0045] For example, the cloud platform can establish a battery self-discharge model by statistically analyzing the big data of the power battery of the vehicle (or multiple vehicles of the same model) and combining it with the offline test data of the power battery. Based on this, according to the battery status at offline times, the battery self-discharge model can be used to simulate the degree of battery self-discharge. When it is predicted that the state of charge of the power battery will drop to a set value, a corresponding reminder function will be triggered.

[0046] For example, a remote alert system can be used to send reminder messages to users via SMS, mobile app, or customer service hotline so that users can take timely measures to address the risk of over-discharge of the vehicle's power battery.

[0047] It should be noted that by combining the offline battery monitoring function described above with the online battery monitoring function of the vehicle's battery management system, dual monitoring and alerts for the power battery are achieved, effectively improving the reliability of monitoring for static over-discharge risks of the power battery.

[0048] In some embodiments, the power battery state management method further includes: When the vehicle is powered off, acquire and record the offline parking time and the current first total mileage of the current drive; Based on the offline parking time, the BMS enters the sleep mode according to the preset first sleep cycle; in the BMS sleep mode, the battery fault monitoring function and the undervoltage inspection function are enabled, and the other battery management functions are disabled. The undervoltage inspection function includes: Obtain the real-time voltage of the power battery; When the real-time voltage is lower than the preset discharge cutoff voltage, a low-voltage flag is sent to the remote alert system so that the remote alert system can issue a low-voltage reminder message.

[0049] like Figure 3 As shown, it should be noted that when the vehicle is powered off, the BMS can obtain the cycle parking time (offline parking time, denoted as t0) and the current total mileage (first total mileage, denoted as M0) of this driving cycle, and can store the offline parking time t0 and the first total mileage M0 in non-volatile memory (NVM).

[0050] Then, the BMS enters BMS hibernation mode, with the hibernation period starting from the offline parking time and continuing until the preset first hibernation cycle (e.g., 7 days) is reached. After the first hibernation cycle, the BMS will automatically wake up and re-acquire the state of charge of the power battery. Simultaneously, it will actively wake up the vehicle via CAN network management and upload battery data to the offline monitoring system on the cloud platform via the TBOX. The offline monitoring system will perform self-discharge prediction based on the latest received battery state of charge to achieve offline monitoring functionality.

[0051] It should be noted that during BMS sleep mode, the sleep timer will be interrupted if the user starts the vehicle or connects to an external charger, and will restart when the vehicle is powered off again.

[0052] For example, the BMS hibernation mode can be configured to retain only the battery fault monitoring function and the undervoltage inspection function, while turning off the other battery management functions.

[0053] like Figure 4 As shown, the steps of the undervoltage inspection function are as follows: 1. In BMS sleep mode, continuously monitor the power battery voltage (obtain the real-time voltage of the power battery). 2. When the real-time voltage is lower than the preset discharge cutoff voltage, the BMS will automatically wake up, calibrate the state of charge of the power battery to 0, wake up the vehicle, and send a battery low voltage flag to the remote reminder system through the CAN bus network. The remote reminder system will remind the user through mobile APP / SMS, etc. (for example, the reminder message is "Power battery power is 0, please charge immediately").

[0054] Based on this, the power consumption of battery status monitoring when the vehicle is stationary is reduced by using a BMS-based periodic sleep mechanism, which further improves the reliability of power battery static over-discharge risk monitoring.

[0055] In some embodiments, the power battery state management method further includes: After sending a low battery warning to the remote alert system, the system enters deep sleep mode of the BMS; in this deep sleep mode, only the battery thermal runaway fault warning function is retained.

[0056] For example, when the undervoltage inspection function detects that the real-time voltage is lower than the preset discharge cutoff voltage, and after sending a battery undervoltage flag to the remote alert system, the BMS switches to BMS deep sleep mode.

[0057] For example, in BMS deep sleep mode, the BMS will only retain the battery thermal runaway fault warning function. After entering BMS deep sleep mode, the BMS releases the vehicle network, and the entire vehicle enters hibernation.

[0058] It's understandable that "vehicle entering sleep mode" refers to a low-power mode during vehicle parking. In this mode, the vehicle will disable some functions that users deem unimportant (this can be configured as needed, such as disabling sentry mode). When the vehicle enters sleep mode, it not only reduces the vehicle's static current but also improves the vehicle's energy efficiency.

[0059] It should be noted that whether the BMS enters sleep mode and whether the vehicle enters sleep mode are controlled independently. That is to say, when the vehicle is in sleep mode, the BMS is not necessarily in sleep mode, and the BMS's self-wake-up from sleep mode may not wake up the vehicle. In addition, when the user actively uses the vehicle, both the vehicle and the BMS will exit sleep mode simultaneously and switch to normal vehicle operation.

[0060] Based on this, by entering the BMS deep sleep mode after detecting low battery voltage, unnecessary monitoring functions of the BMS can be turned off, thereby further saving the power consumption of battery monitoring.

[0061] In some embodiments, the power battery state management method further includes: After the BMS sleep mode is automatically woken up based on the preset first sleep cycle, the current second total driving mileage and the current second moment are obtained; If the second total mileage is equal to the first total mileage, the parking duration is determined based on the difference between the second time point and the offline parking time point; If the parking duration does not exceed the preset second sleep cycle, the system will re-enter BMS sleep mode; the second sleep cycle is longer than the first sleep cycle. If the parking time exceeds the preset second sleep cycle, a long-term inactivity flag will be sent to the remote alert system so that the remote alert system can issue a timely vehicle access reminder.

[0062] It should be noted that after the BMS self-wakes up after the first sleep cycle (e.g., 7 days), it can actively wake up the whole vehicle through the CAN network management and receive the current total mileage (second total mileage, set as M1) and TBOX real-time time (the current second moment, set as t1) from the whole vehicle CAN network.

[0063] For example, if it is determined that the second total mileage is equal to the first total mileage, i.e., M1=M0, then the parking duration (the current parking duration) is further determined, which is the duration from the last recorded parking time to the current time (t1-t0).

[0064] If the current parking duration is less than or equal to the preset second sleep cycle (the second sleep cycle is greater than the first sleep cycle, for example, set to 14 days), for example, t1-t0≤14 days, then it is determined that there is no risk of static over-discharge of the power battery, the BMS releases the CAN network request, and the whole vehicle enters sleep mode (and re-enters BMS sleep mode at the same time).

[0065] If the parking time exceeds the preset second dormancy period, for example, t1-t0>14 days, the user needs to be reminded to use the vehicle in time through the remote reminder system (for example, by sending a text message "The vehicle has not been used for a long time, please start it as soon as possible").

[0066] Based on this, by triggering a vehicle use reminder message when the parking time exceeds the preset second sleep cycle, the reliability of vehicle static over-release monitoring is further improved.

[0067] In some embodiments, the power battery state management method further includes: If the second total mileage is not equal to the first total mileage, the previously recorded first total mileage will be updated to the second total mileage, the previously recorded offline parking time will be updated to the second time, and the system will re-enter BMS sleep mode.

[0068] It should be noted that if the second total mileage is not equal to the first total mileage, i.e. M1≠M0, it means that the vehicle has been started and driven since the last time it was parked and before the current BMS self-wake-up (the user has used the vehicle at least once). Therefore, it is believed that there is no risk of static over-discharge of the power battery.

[0069] In this way, the previously recorded first total mileage can be updated to the second total mileage (that is, the value of M1 is assigned to M0), and the previously recorded offline parking time can be updated to the second time (that is, time t1 is assigned to t0), which is also stored in NVM; then BMS releases the CAN network request, and the whole vehicle enters sleep mode (and re-enters BMS sleep mode).

[0070] Based on this, when vehicle usage is detected during a single sleep cycle, the recorded mileage and parking time are updated, further improving the reliability of vehicle static over-discharge monitoring.

[0071] In some embodiments, the power battery state management method further includes: If the parking duration exceeds the preset second sleep cycle, obtain the static battery voltage; Determine the self-discharge loss corresponding to the duration of this parking session; The current state of charge of the power battery is calibrated based on the static battery voltage and the amount of self-discharge loss, and the calibrated state of charge of the battery is obtained. Status monitoring is performed based on the calibrated state of battery charge.

[0072] It should be noted that if the parking time exceeds the preset second hibernation period, for example, t1-t0>14 days, in addition to reminding the user to use the vehicle in time through the remote reminder system, the battery state of charge can be further calibrated and the status of the battery can be monitored based on the calibrated battery status.

[0073] For example, the calibration of the battery state of charge can include two parts: First, the state of charge of the power battery can be calibrated by the static battery voltage. Specifically, by obtaining the static battery voltage, it can be converted into the battery state of charge according to a preset mapping relationship. Second, based on the calibration of the battery state of charge by the static battery voltage, if it is a lithium iron phosphate battery and it is in the discharge plateau region, in order to avoid incorrect correction of the static voltage, the calibrated battery state of charge can be obtained by deducting the battery self-discharge loss caused by the long-term parking of the vehicle (self-discharge loss of electricity, such as the monthly average self-discharge rate * number of parking days / 30).

[0074] Based on this, when the parking time exceeds the preset second sleep cycle, the current state of charge is calibrated by the static battery voltage and the amount of self-discharge loss, and the state of charge is monitored based on the calibrated battery state of charge, which further improves the reliability of vehicle static over-discharge monitoring.

[0075] In some embodiments, state monitoring is performed based on the calibrated battery state of charge, including: If the calibrated state of charge of the battery is lower than a preset first state threshold, determine whether the vehicle is connected to the charging pile and whether the charging pile supports cardless charging. If it is determined that the vehicle is connected to a charging pile and the charging pile supports cardless charging, control the power battery to charge to the preset target level and adjust the temperature of the power battery to reach the preset temperature range. If it is determined that the vehicle is not connected to a charging station or the charging station does not support cardless charging, the vehicle is requested to enter power saving mode; wherein, power saving mode disables preset functions that consume power battery power when the vehicle is stationary.

[0076] It should be noted that after obtaining the calibrated state of charge of the battery, further monitoring and judgment can be made based on this.

[0077] For example, when the calibrated state of charge of the battery is not lower than a preset first state threshold (e.g., 30%), it is considered that there is no risk of static over-discharge of the power battery, the BMS releases the CAN network request, and the whole vehicle enters sleep mode.

[0078] When the calibrated battery state of charge is lower than the preset first state threshold (e.g., 30%), it is further determined whether the vehicle is connected to the charging pile and whether the charging pile supports cardless charging.

[0079] For example, if the charging gun is connected and the charging pile supports cardless charging, the vehicle will be controlled to charge, and the state of charge (SOC) and battery temperature will be automatically adjusted to the range most conducive to the safe storage of the battery (based on pre-calibrated experimental settings). For example, the target SOC may be set to 80%, and the battery temperature may be adjusted to [20°C, 25°C] during charging. When the preset target charge level is reached, the BMS will actively stop charging, release the CAN network request, and the vehicle will enter sleep mode. It should be noted that after charging is complete, the battery temperature can be adjusted to the optimal temperature range before entering the vehicle sleep mode.

[0080] For example, if the charging station does not support cardless charging or is not connected to a charging gun, the BMS requests the vehicle to enter power-saving mode. In power-saving mode, preset functions that consume power battery power when the vehicle is stationary will be disabled. These preset functions may include, but are not limited to, intelligent charging (automatic charging function), sentry mode, battery constant temperature protection, remote air conditioning, etc. The specific types of functions to be disabled can be set according to actual needs.

[0081] Based on this, when the battery level is detected to be low, the vehicle can be automatically charged or put into power-saving mode, which further improves the reliability of the power battery's ability to withstand static over-discharge.

[0082] In some embodiments, the power battery state management method further includes: If the calibrated state of charge of the battery is lower than a preset second state threshold, a low battery indicator is sent to the remote alert system so that the remote alert system can issue a charging reminder; wherein the second state threshold is less than the first state threshold. After sending a low battery warning to the remote alert system, the system enters BMS low power mode; in BMS low power mode, only the battery fault monitoring function is retained.

[0083] It should be noted that if the calibrated battery state of charge is lower than the preset first state threshold, and it is determined that the charging pile does not support cardless charging or is not connected to the charging gun, in addition to requesting the vehicle to enter power saving mode, it is also necessary to continuously monitor the battery status.

[0084] For example, when it is further detected that the calibrated battery state of charge is lower than a preset second state threshold (the second state threshold is less than the first state threshold, for example, set to 10%), a low battery indicator can be sent to the remote alert system via the CAN bus network. The remote alert system can then send charging reminder information to the user via a mobile app / SMS (for example, prompting "The power battery is low, please charge it as soon as possible").

[0085] In addition to reminding users to charge as soon as possible, the BMS can also disable the undervoltage inspection function, enter the BMS low power mode (only retaining the battery fault monitoring function), and then the BMS releases the CAN bus network request, and the whole vehicle enters sleep mode.

[0086] In addition, after the vehicle enters power saving mode, if the calibrated battery state of charge is not lower than the preset second state threshold (i.e., state of charge ≥ 10%), the BMS releases the CAN bus network request and the vehicle enters sleep mode.

[0087] Based on this, when the battery level is detected to be too low, a charging reminder is triggered and the system further enters the BMS low power mode, thereby further improving the reliability of the power battery's static over-discharge risk.

[0088] In some embodiments, the offline monitoring system is configured as follows: The current state of charge of the power battery is determined based on the offline battery status and a preset battery self-discharge model. If the current state of charge is lower than the preset third state threshold, the current battery over-discharge risk level is determined to be low risk. If the current state of charge is lower than the preset fourth state threshold, the current battery over-discharge risk level is determined to be medium risk; where the fourth state threshold is less than the third state threshold. If the current state of charge is below the fourth state threshold and the vehicle is offline for a longer period than the preset time threshold, the current battery over-discharge risk level is determined to be high risk. Determine the response strategy corresponding to the current battery over-discharge risk level, and issue a battery over-discharge warning message based on the determined response strategy.

[0089] It should be noted that the offline monitoring system can be deployed on a cloud platform associated with the vehicle. When the vehicle is powered off, the BMS can upload the battery power (battery status at offline time) to the cloud platform via the CAN bus and TBOX. The offline monitoring system in the cloud platform simulates self-discharge according to the battery status at offline time and a preset battery self-discharge model, and monitors the battery status (current state of charge) after self-discharge in real time.

[0090] like Figure 5 As shown, for example, when the current state of charge (state of charge when the vehicle is offline - state of charge lost due to self-discharge) is not lower than a preset third state threshold (e.g., set to 3%), it is considered risk-free; when the current state of charge is lower than the preset third state threshold, it is considered low risk; when the current state of charge is lower than the preset fourth state threshold (the fourth state threshold is less than the third state threshold, e.g., 0%), it is considered medium risk; when the current state of charge is lower than the preset fourth state threshold, and the vehicle offline time (obtained by timing based on the vehicle offline time, where the vehicle offline time can be uploaded to the cloud platform along with the offline battery status, or the cloud platform can determine the vehicle offline time by receiving the offline battery status) is greater than a preset time threshold (set according to requirements, e.g., 6 months), it is considered high risk.

[0091] It should be noted that corresponding response strategies can be configured for different battery over-discharge risk levels. For example, when the risk is determined to be low, the user can be reminded to charge the battery as soon as possible through a remote prompting system; when the risk is determined to be medium or high, the vehicle's static over-discharge risk information can be pushed to the customer service center to remind customer service to conduct a customer follow-up visit on the vehicle. After obtaining the user's authorization, the customer service can provide valet charging services, manual on-site inspection, or towing to the user center for processing.

[0092] Based on this, by setting different offline monitoring conditions and triggering different reminder strategies when the corresponding conditions are met, the reliability of the static over-discharge risk of the power battery is further improved.

[0093] Please refer to Figure 6 , Figure 6 A block diagram illustrating the composition of a power battery state management device provided in some embodiments of this application is shown. It should be understood that this power battery state management device is similar to the one described above. Figure 1 Corresponding to the method embodiments, it is able to execute each step involved in the above method embodiments. The specific functions of the power battery state management device can be found in the description above. To avoid repetition, detailed descriptions are appropriately omitted here.

[0094] Figure 6The power battery state management device includes at least one software function module that can be stored in a memory or embedded in the power battery state management device in the form of software or firmware. The power battery state management device includes: The status acquisition module 610 is used to acquire the battery status of the vehicle at the offline time when the vehicle is powered off. The status monitoring module 620 is used to send the battery status at the offline time to the offline monitoring system so that the offline monitoring system can perform status monitoring based on the battery status at the offline time and the preset battery self-discharge model.

[0095] It is understood that the above-described device embodiments correspond to the method embodiments of the present invention. The power battery state management device provided by the embodiments of the present invention can implement the power battery state management method provided by any one of the method embodiments of the present invention.

[0096] Those skilled in the art will understand that, for the sake of convenience and brevity, the specific working process of the device described above can be referred to the corresponding process in the aforementioned method, and will not be elaborated further here.

[0097] like Figure 7 As shown, some embodiments of this application provide an electronic device 700, which includes a memory 710, a processor 720, and a computer program stored in the memory 710 and executable on the processor 720. When the processor 720 reads the program from the memory 710 via a bus 730 and executes the program, it can implement any of the methods included in the above-described power battery state management method.

[0098] Processor 720 can process digital signals and can include various computing architectures. For example, it can be a complex instruction set computer architecture, a reduced instruction set computer architecture, or an architecture that implements multiple instruction set combinations. In some examples, processor 720 can be a microprocessor.

[0099] The memory 710 can be used to store instructions executed by the processor 720 or data related to the execution of instructions. These instructions and / or data may include code for implementing some or all of the functions of one or more modules described in the embodiments of this application. The processor 720 of this disclosure embodiment can be used to execute the instructions in the memory 710 to implement the methods shown above. The memory 710 includes dynamic random access memory, static random access memory, flash memory, optical memory, or other memories well known to those skilled in the art.

[0100] Some embodiments of this application also provide a computer-readable storage medium storing a computer program that, when executed by a processor, describes the method described in the method embodiments.

[0101] Some embodiments of this application also provide a computer program product that, when run on a computer, causes the computer to perform the methods described in the method embodiments.

[0102] It should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For apparatus embodiments, since they are basically similar to method embodiments, the description is relatively simple; relevant parts can be referred to the descriptions in the method embodiments.

[0103] It should be understood, in the several embodiments provided in this application, that the disclosed apparatus and methods can also be implemented in other ways. The apparatus embodiments described above are merely illustrative; for example, the flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods, and computer program products according to various embodiments of this application. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions marked in the blocks may occur in a different order than those marked in the drawings. For example, two consecutive blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in a block diagram and / or flowchart, and combinations of blocks in block diagrams and / or flowcharts, can be implemented using a dedicated hardware-based system that performs the specified function or action, or using a combination of dedicated hardware and computer instructions.

[0104] In addition, the functional modules in the various embodiments of this application can be integrated together to form an independent part, or each module can exist independently, or two or more modules can be integrated to form an independent part.

[0105] If the aforementioned functions are implemented as software functional modules and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0106] The above description is merely an embodiment of this application and is not intended to limit the scope of protection of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of protection of this application. It should be noted that similar reference numerals and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0107] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

[0108] It should 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, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

Claims

1. A method for managing the state of a power battery, characterized in that, include: When the vehicle is powered off, obtain the vehicle's offline battery status; The battery status at the offline time is sent to the offline monitoring system so that the offline monitoring system can perform status monitoring based on the battery status at the offline time and a preset battery self-discharge model.

2. The power battery state management method according to claim 1, characterized in that, Also includes: When the vehicle is powered off, acquire and record the offline parking time and the current first total mileage of the current drive; Based on the offline parking time, the BMS enters sleep mode according to a preset first sleep cycle; wherein, the BMS sleep mode enables battery fault monitoring and undervoltage inspection functions, and disables other battery management functions. The undervoltage inspection function includes: Obtain the real-time voltage of the power battery; When the real-time voltage is lower than the preset discharge cutoff voltage, a low-voltage flag is sent to the remote alert system so that the remote alert system can issue a low-voltage reminder message.

3. The power battery state management method according to claim 2, characterized in that, Also includes: After sending a low battery warning to the remote alert system, the system enters a deep sleep mode for the battery management system (BMS); wherein, the deep sleep mode of the BMS retains only the battery thermal runaway fault warning function.

4. The power battery state management method according to claim 2, characterized in that, Also includes: After the BMS sleep mode is automatically woken up based on the preset first sleep cycle, the current second total driving mileage and the current second time are obtained; If the second total mileage is equal to the first total mileage, the parking duration is determined based on the difference between the second time and the offline parking time. If the current parking duration does not exceed the preset second sleep cycle, then the system will re-enter the BMS sleep mode; wherein the second sleep cycle is longer than the first sleep cycle. If the parking duration exceeds the preset second sleep cycle, a long-term inactivity flag is sent to the remote alert system so that the remote alert system can issue a timely vehicle usage reminder.

5. The power battery state management method according to claim 4, characterized in that, Also includes: If the second total mileage is not equal to the first total mileage, the previously recorded first total mileage is updated to the second total mileage, the previously recorded offline parking time is updated to the second time, and the system re-enters BMS sleep mode.

6. The power battery state management method according to claim 4, characterized in that, Also includes: If the current parking duration exceeds the preset second sleep cycle, obtain the static battery voltage; Determine the self-discharge loss of electricity corresponding to the duration of this parking session; The current state of charge of the power battery is calibrated based on the static battery voltage and the self-discharge loss, to obtain the calibrated battery state of charge. Status monitoring is performed based on the calibrated state of battery charge.

7. The power battery state management method according to claim 6, characterized in that, The state monitoring based on the calibrated battery state of charge includes: If the calibrated state of charge of the battery is lower than a preset first state threshold, determine whether the vehicle is connected to the charging pile and whether the charging pile supports cardless charging. If it is determined that the vehicle is connected to a charging pile and the charging pile supports cardless charging, control the power battery to charge to the preset target level and adjust the temperature of the power battery to reach the preset temperature range. If it is determined that the vehicle is not connected to a charging station or the charging station does not support cardless charging, the vehicle is requested to enter power saving mode; wherein, the power saving mode disables preset functions that consume power battery power when the vehicle is stationary.

8. The power battery state management method according to claim 7, characterized in that, Also includes: If the calibrated state of charge of the battery is lower than a preset second state threshold, a low battery indicator is sent to the remote alert system so that the remote alert system issues a charging reminder message; wherein the second state threshold is less than the first state threshold; After sending a low battery warning to the remote alert system, the system enters the BMS low power mode; wherein, the BMS low power mode retains only the battery fault monitoring function.

9. The power battery state management method according to any one of claims 1 to 8, characterized in that, The offline monitoring system is configured as follows: The current state of charge of the power battery is determined based on the offline battery state and the preset battery self-discharge model. If the current state of charge is lower than a preset third state threshold, the current battery over-discharge risk level is determined to be low risk. If the current state of charge is lower than a preset fourth state threshold, the current battery over-discharge risk level is determined to be medium risk; wherein the fourth state threshold is less than the third state threshold. If the current state of charge is lower than the fourth state threshold and the vehicle is offline for a longer period than a preset time threshold, the current battery over-discharge risk level is determined to be high risk. Determine the response strategy corresponding to the current battery over-discharge risk level, and issue a battery over-discharge warning message based on the determined response strategy.

10. An electronic device, characterized in that, The device includes a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor, when executing the program, can implement the power battery state management method according to any one of claims 1-9.

11. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program, which, when executed by a processor, performs the power battery state management method as described in any one of claims 1-9.

12. A vehicle, characterized in that, It includes a controller for performing the power battery state management method as described in any one of claims 1-9.

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