Battery charging control method, device and vehicle

Abstract

The application discloses a battery power compensation control method and device and a vehicle. The method comprises the following steps: obtaining a state of charge of a battery in a sleep state; determining a power compensation state of the battery according to a size relationship between the state of charge and first and second preset states of charge; wherein the first preset state of charge is greater than the second preset state of charge; and performing power compensation according to a preset power compensation strategy when the power compensation state of the battery is a planned power compensation state. The scheme can avoid the problem of frequent triggering of high-voltage power compensation based on a single threshold, reduce the number of awakenings of a high-voltage system of the vehicle, reduce the static power consumption of the vehicle, and improve the service life of high-voltage components and the operation reliability of the vehicle.

Description

Technical Field

[0001] This invention relates to the field of vehicle technology, and in particular to a battery charging control method, device, and vehicle. Background Technology

[0002] Existing pure electric vehicles or hybrid vehicles are typically equipped with a high-voltage power battery and a separate low-voltage battery. The low-voltage battery is responsible for supplying power to the low-voltage electrical equipment inside the vehicle. However, when parked for extended periods or during prolonged low-voltage electrical operations, the low-voltage battery will continuously discharge, posing a risk of depletion. Once the low-voltage battery is depleted, it can lead to serious problems such as the vehicle failing to start, the high-voltage system failing to power, and intelligent functions malfunctioning.

[0003] Current common power replenishment solutions are prone to power loss when left idle for a long time. There are potential risks of frequent wake-up leading to wear and tear on high-voltage components, or power loss due to untimely power replenishment.

[0004] Therefore, there is an urgent need for an intelligent, adaptive, and low-power low-voltage battery charging system and method to ensure the low-voltage battery power while optimizing the high-voltage system's operating mode, thereby improving the vehicle's energy utilization efficiency and component reliability. Summary of the Invention

[0005] This invention provides a battery charging control method, device, and vehicle to solve the problem of battery depletion due to prolonged vehicle idling, frequent activation of the vehicle's high-voltage system, and impact on the service life of high-voltage components and the overall reliability of vehicle operation.

[0006] According to one aspect of the present invention, a method for controlling the charging of a storage battery is provided, comprising: Obtain the state of charge of the battery in its dormant state; The charging state of the battery is determined based on the relationship between the state of charge and the first preset state of charge and the second preset state of charge; wherein the first preset state of charge is greater than the second preset state of charge. When the battery is in a planned charging state, charging is performed according to a preset planned charging strategy.

[0007] Optionally, the power replenishment status includes one of the following: normal monitoring status, planned power replenishment status, and immediate power replenishment status; Determining the battery's charging state based on the relationship between the state of charge and a first preset state of charge and a second preset state of charge includes: When the state of charge is greater than or equal to the first preset state of charge, the battery is determined to be in a normal monitoring state. When the state of charge is greater than or equal to the second preset state of charge and less than the first preset state of charge, the battery is determined to be in a planned charging state. When the state of charge is less than the second preset state of charge, the battery is determined to be in an immediate recharging state.

[0008] Optionally, when the battery is in a planned charging state, charging is performed according to a preset planned charging strategy, including: The target charging time period is determined based on the current time information and ambient temperature parameters corresponding to the battery. During the target charging period, the battery is charged via a high-voltage power battery.

[0009] Optionally, based on the current time information and ambient temperature parameters corresponding to the battery, a target charging time period is determined, including: When the current time information is at a preset time threshold, the target power replenishment period is delayed until after the preset time threshold.

[0010] Optionally, before obtaining the state of charge of the battery in its dormant state, the method further includes: The real-time voltage data, real-time temperature data, and state of charge change rate of the battery in dormant state are obtained based on the monitoring frequency. The monitoring status of the battery is determined based on the real-time voltage data, real-time temperature data, and the relationship between the rate of change of state of charge and the preset data threshold.

[0011] Optionally, the monitoring status of the battery is determined based on the real-time voltage data, real-time temperature data, and the relationship between the rate of change of state of charge and a preset data threshold, including: When at least one of the real-time voltage data, the real-time temperature data, and the rate of change of state of charge meets a preset abnormal condition, the battery is determined to be in an abnormal monitoring state. When the real-time voltage data, the real-time temperature data, and the rate of change of state of charge do not meet the preset abnormal conditions, the battery is determined to be in the normal monitoring state. The monitoring frequency in the normal monitoring state is less than the monitoring frequency in the abnormal monitoring state.

[0012] Optionally, when at least one of the real-time voltage data, the real-time temperature data, and the rate of change of state of charge meets a preset abnormal condition, the battery is determined to be in an abnormal monitoring state, including: When the real-time voltage data is lower than the first voltage threshold, it is determined that the battery is in an abnormal monitoring state; And / or, When the real-time temperature data is lower than the first temperature threshold, it is determined that the battery is in the abnormal monitoring state; And / or, If the rate of change of state of charge is higher than a first rate of change threshold, the battery is determined to be in the abnormal monitoring state.

[0013] Optionally, after the battery is in a planned charging state, charging is performed according to a preset planned charging strategy; or, after the battery is in an immediate charging state, charging is performed, the method further includes: The battery is recharged when it reaches a third preset state of charge; wherein the third preset state of charge is greater than the first preset state of charge. After the battery is recharged, the system controls the battery to return to the normal monitoring state.

[0014] According to a second aspect of the present invention, a battery charging control device is also provided, comprising: The acquisition module is used to acquire the state of charge of the battery in its dormant state. The judgment module is used to determine the charging state of the battery based on the relationship between the state of charge and a first preset state of charge and a second preset state of charge; wherein the first preset state of charge is greater than the second preset state of charge. The battery replenishment control module is used to replenish the battery according to a preset planned replenishment strategy when the battery is in a planned replenishment state.

[0015] According to a third aspect of the present invention, a vehicle is also provided, comprising: a battery charging control device as described in the second aspect of the present invention and a high-voltage power battery system; the high-voltage power battery system is connected to the battery via a DC-DC converter; the high-voltage power battery system is used to charge the battery via the DC-DC converter according to the charging control device.

[0016] The technical solution provided by this invention obtains the state of charge (SOC) of the battery in its dormant state and determines the corresponding charging state of the battery based on the relationship between the SOC and a first preset SOC and a second preset SOC, thereby dividing the battery state into different charging stages. When the battery is in a planned charging state, the charging operation is delayed according to a preset planned charging strategy, rather than immediately activating the high-voltage system to charge after detecting a decrease in battery power. Therefore, the problem of frequently triggering high-voltage charging based on a single threshold can be avoided, reducing the number of times the vehicle's high-voltage system is woken up, reducing the static power consumption of the entire vehicle, and improving the service life of high-voltage components and the overall reliability of vehicle operation.

[0017] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 A schematic flowchart of a battery charging control method provided in an embodiment of the present invention; Figure 2 A schematic flowchart illustrating another battery charging control method provided in an embodiment of the present invention; Figure 3 A schematic flowchart illustrating another battery charging control method provided in an embodiment of the present invention; Figure 4 A schematic flowchart illustrating another battery charging control method provided in an embodiment of the present invention; Figure 5 A schematic flowchart illustrating another battery charging control method provided in an embodiment of the present invention; Figure 6 A schematic flowchart illustrating another battery charging control method provided in an embodiment of the present invention; Figure 7 A schematic flowchart illustrating another battery charging control method provided in an embodiment of the present invention; Figure 8 A schematic flowchart illustrating another battery charging control method provided in an embodiment of the present invention; Figure 9 A schematic diagram of a battery charging control device provided in an embodiment of the present invention; Figure 10 This is a schematic diagram of the structure of a vehicle battery intelligent charging system provided in an embodiment of the present invention. Detailed Implementation

[0020] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0021] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0022] As mentioned in the background issue, existing pure electric vehicles or hybrid vehicles typically rely on a single voltage threshold for power replenishment, which can easily lead to power depletion when the vehicle is idle for extended periods. Alternatively, a fixed voltage threshold can be used for wake-up power replenishment, but this can result in frequent wake-ups of the vehicle's high-voltage system, increasing static power consumption and causing the high-voltage system to operate more frequently. This reduces the lifespan of the vehicle's high-voltage components and the overall reliability of the vehicle.

[0023] To address the aforementioned technical problems, embodiments of the present invention provide a battery charging control method. Figure 1 This is a schematic flowchart illustrating a battery charging control method provided in an embodiment of the present invention. Figure 1 As shown, the battery charging control method includes: S110. Obtain the state of charge of the battery in its dormant state.

[0024] Specifically, the battery can be a low-voltage vehicle battery, such as a 12V or 24V battery. After the vehicle is turned off and enters a sleep state, the vehicle's controller can periodically wake up the low-power monitoring unit to obtain the current state of charge (SBC) of the battery. SBC can be understood as the percentage of the battery's rated capacity that is currently available, used to indicate the battery's remaining charge.

[0025] S120. Determine the battery charging state based on the relationship between the state of charge and the first preset state of charge and the second preset state of charge.

[0026] Specifically, the first preset state of charge (SOC) and the second preset SOC can be preset according to parameters such as vehicle type and user habits. The first preset SOC is greater than the second preset SOC. The first preset SOC represents the safe charge threshold of the battery; that is, when the battery's SOC is greater than the first preset SOC, it will not affect the normal use of the vehicle. The second preset SOC represents the low charge threshold of the battery; that is, when the battery's SOC is less than the second preset SOC, if it is not replenished quickly, it will affect the normal use of the vehicle. By setting the first and second preset SOCs, the battery is divided into different charging states, which avoids the problem of frequent charging triggers due to a single judgment criterion, thereby reducing the number of high-voltage system wake-ups, improving the service life of high-voltage components, and enhancing the overall vehicle reliability.

[0027] S130. When the battery is in the planned charging state, charge it according to the preset planned charging strategy.

[0028] Specifically, by comparing the battery's state of charge (SOC) with a first and a second preset SOC, the battery's charging status can be categorized into three states: routine monitoring, planned charging, and immediate charging. The planned charging state can be understood as a condition where the battery's charge is low but not currently affecting normal use. The preset planned charging strategy means that in the planned charging state, the high-voltage system is not immediately activated; instead, a delay is waited before the high-voltage system is activated to control the high-voltage power battery to charge the battery. For example, if the battery is determined to be in the planned charging state at 22:05, the preset planned charging strategy plans to charge the battery two hours later. That is, at 0:05, the vehicle begins charging the battery. The delay time can be set and adjusted according to vehicle operating conditions and environmental parameters. In the planned charging state, using a delayed charging method reduces the frequency of high-voltage system wake-ups, thereby reducing overall vehicle static power consumption and improving the lifespan of high-voltage components and overall vehicle reliability.

[0029] The technical solution provided by this invention obtains the state of charge (SOC) of the battery in its dormant state and determines the corresponding charging state of the battery based on the relationship between the SOC and a first preset SOC and a second preset SOC, thereby dividing the battery state into different charging stages. When the battery is in a planned charging state, the charging operation is delayed according to a preset planned charging strategy, rather than immediately activating the high-voltage system to charge after detecting a decrease in battery power. Therefore, the problem of frequently triggering high-voltage charging based on a single threshold can be avoided, reducing the number of times the vehicle's high-voltage system is woken up, reducing the static power consumption of the entire vehicle, and improving the service life of high-voltage components and the overall reliability of vehicle operation.

[0030] Figure 2 This is a schematic flowchart illustrating another battery charging control method provided in an embodiment of the present invention. Based on the above embodiments, see... Figure 2 Optionally, the method includes: S210: Obtain the state of charge of the battery in its dormant state.

[0031] S220. When the state of charge is greater than or equal to the first preset state of charge, determine that the battery is in a normal monitoring state.

[0032] Specifically, when the battery's state of charge (SOC) is greater than or equal to a first preset SOC, it indicates that the battery's current remaining charge is within the normal operating range and can meet the vehicle's static power needs during sleep periods. Therefore, there is no need to activate the high-voltage system for recharging. At this time, the vehicle can periodically check the battery's status according to a preset monitoring frequency, thereby reducing energy consumption during vehicle sleep periods.

[0033] S230. When the state of charge is greater than or equal to the second preset state of charge and less than the first preset state of charge, the battery is determined to be in a planned charging state.

[0034] Specifically, when the battery's state of charge (SOC) is detected to have dropped below the first preset SOC but remains above or equal to the second preset SOC, it indicates a risk of further depletion of the battery's remaining charge, but this does not affect the vehicle's normal operation, and the battery has not yet reached a point where immediate recharging is required. In this case, the battery can be designated as a planned recharging state, and a delay time can be calculated according to a preset planned recharging strategy. Recharging will then be performed after the delay. This avoids frequent recharging triggers due to small fluctuations in battery charge or short-term load changes, thereby reducing the number of times the vehicle's high-voltage system is woken up, lowering the vehicle's static power consumption, and improving the lifespan of high-voltage components and the overall reliability of the vehicle.

[0035] S240. When the state of charge is less than the second preset state of charge, determine that the battery is in an immediate recharging state.

[0036] Specifically, when the battery's state of charge (SOC) is lower than the second preset SOC, it indicates that the remaining battery charge poses a risk to the normal operation of the vehicle's low-voltage system. In this case, the vehicle can immediately activate the high-voltage system and replenish the battery via the high-voltage power battery to ensure the normal operation of the vehicle's low-voltage electrical equipment and the reliability of the vehicle's overall functions.

[0037] S250. When the battery is in the planned charging state, charging is performed according to the preset planned charging strategy.

[0038] Figure 3 This is a schematic flowchart illustrating another battery charging control method provided in an embodiment of the present invention. Based on the above embodiments, see... Figure 3 Optionally, the method includes: S310: Obtain the state of charge of the battery in its dormant state.

[0039] S320. Determine the battery charging state based on the relationship between the state of charge and the first preset state of charge and the second preset state of charge.

[0040] S330: Determine the target charging time period based on the current time information and ambient temperature parameters corresponding to the battery.

[0041] Specifically, the current time information can be understood as the moment within a monitoring cycle when the battery is first determined to be in a planned charging state. The ambient temperature parameter can be understood as the real-time temperature of the vehicle's environment or the temperature over a future period. The target charging time period can be understood as the future time for battery charging calculated based on a preset planned charging strategy. The vehicle controller can determine the suitable target charging time period for performing the charging operation based on the current time information and ambient temperature parameters. For example, in low-temperature environments at night, the planned charging delay time can be appropriately shortened to reduce the risk of rapid battery capacity degradation caused by low temperatures, thus completing the charging before the user's high-frequency usage period and ensuring vehicle starting reliability. In high-temperature environments during the day, the planned charging delay time can be appropriately extended to avoid frequent activation of the high-voltage system for charging under high-temperature conditions, thereby reducing battery heat load and vehicle static power consumption, and reducing the number of high-voltage system operations. It should be noted that if a target charging time period is determined in the planned charging state, but the user starts the vehicle before the target charging time period arrives, a prompt can be issued to remind the user that the battery charge is low and that a charging plan is in place for the battery in the future.

[0042] S340. During the target charging period, the battery is charged by the high-voltage power battery.

[0043] Specifically, upon entering the target charging period, the vehicle can control the high-voltage relay to close and convert the electrical energy from the high-voltage power battery into the target low-voltage electrical energy via a DC-DC converter to charge the battery. During the charging process, the charging power can be dynamically adjusted based on the battery's current state of charge and other charging parameters, thereby improving charging efficiency and reducing the risk of battery aging.

[0044] Figure 4 This is a schematic flowchart illustrating another battery charging control method provided in an embodiment of the present invention. Based on the above embodiments, see... Figure 4 Optionally, the method includes: S410: Obtain the state of charge of the battery in its dormant state.

[0045] S420. Determine the battery charging state based on the relationship between the state of charge and the first preset state of charge and the second preset state of charge.

[0046] S430. When the current time information is at a preset time threshold, the target power replenishment time period is delayed until after the preset time threshold.

[0047] Specifically, the preset time threshold can be understood as the user's high-frequency vehicle usage period, the vehicle's high-load operation period, or the peak grid load period. The preset time threshold can be adaptively set according to parameters such as user needs. When the current time information is detected to be within the preset time threshold, the target power replenishment period needs to be delayed until after the preset time threshold. This avoids frequent activation of the high-voltage system when the vehicle may be used or the system load is high, thereby reducing overall vehicle power consumption and improving the user experience. For example, during peak grid load periods, the planned power replenishment delay time can be appropriately extended, waiting until the off-peak electricity period to perform the power replenishment operation.

[0048] S440. During the target charging period, the battery is charged by the high-voltage power battery.

[0049] Figure 5 This is a schematic flowchart illustrating another battery charging control method provided in an embodiment of the present invention. Based on the above embodiments, see... Figure 5 Optionally, the method includes: S510: Obtain real-time voltage data, real-time temperature data, and state of charge change rate of the battery in dormant state according to the monitoring frequency.

[0050] Specifically, the monitoring frequency can be dynamically adjusted based on the battery's health status and environmental parameters. Real-time voltage data reflects the battery's current remaining charge; real-time temperature data reflects the battery's current operating environment; and the state of charge rate reflects the rate of charge decay. By comprehensively acquiring these parameters, the accuracy of battery status monitoring can be improved.

[0051] S520: Determine the monitoring status of the battery based on real-time voltage data, real-time temperature data, and the relationship between the rate of change of state of charge and preset data thresholds.

[0052] Specifically, when at least one of the real-time voltage data, real-time temperature data, or rate of change of state of charge exceeds a corresponding preset data threshold, it can be determined that the battery has the risk of abnormal power consumption, low-temperature degradation, or abnormal discharge. Therefore, the battery can be switched to an abnormal monitoring state. Otherwise, it can be determined that the battery is in a normal monitoring state. By distinguishing between different monitoring states, the monitoring frequency can be dynamically adjusted. When the battery has an abnormal risk, the monitoring frequency is increased to detect the abnormal state of the battery in time and execute the charging control in advance; when the battery is in a normal state, the monitoring frequency is reduced, thereby reducing the number of times the vehicle controller is woken up.

[0053] It should be noted that if the battery is in a planned charging state but has not yet reached the target charging time period, and the monitored state of charge (SOC) of the battery is lower than the second preset SOC, the battery can be re-determined to be in an immediate charging state, and the high-voltage system can be activated in advance to immediately charge the battery. This setting can prevent the battery charge from further decreasing during the waiting period to reach the target charging time period, which would affect the normal operation of the vehicle's low-voltage electrical equipment, thereby improving the vehicle's power supply safety and overall vehicle operational reliability.

[0054] S530: Obtain the state of charge of the battery in its dormant state.

[0055] S540. Determine the battery charging state based on the relationship between the state of charge and the first preset state of charge and the second preset state of charge.

[0056] S550: When the battery is in the planned charging state, charging is performed according to the preset planned charging strategy.

[0057] Figure 6 This is a schematic flowchart illustrating another battery charging control method provided in an embodiment of the present invention. Based on the above embodiments, see... Figure 6 Optionally, the method includes: S610: Obtain real-time voltage data, real-time temperature data, and state of charge change rate of the battery in dormant state according to the monitoring frequency.

[0058] S620. When at least one of the real-time voltage data, real-time temperature data, and state of charge change rate meets a preset abnormal condition, the battery is determined to be in an abnormal monitoring state.

[0059] Specifically, the monitoring frequency under normal monitoring conditions is lower than that under abnormal monitoring conditions. Preset abnormal conditions may include at least one of the following: abnormal drop in battery voltage, excessively low ambient temperature, or rapid decay of state of charge. When at least one of these abnormal conditions is detected, the monitoring frequency of the battery status can be increased to promptly identify battery abnormalities.

[0060] It should be noted that the battery monitoring status and charging status can be independent parameters. The monitoring status indicates the frequency and intensity of battery status data detection, while the charging status indicates the current charging strategy. Therefore, the monitoring status does not directly determine the charging status, nor does the charging status directly determine the monitoring status. For example, when the battery is in a normal monitoring state, if the detected state of charge (SOC) is lower than a first preset SOC, the battery can still be in a planned charging state or an immediate charging state. Conversely, when the battery is in an abnormal monitoring state, even if the monitoring frequency is increased, the battery can still be determined to be in a planned charging state or an immediate charging state based on its current SOC. By separating the monitoring status and charging status, dynamic monitoring of abnormal battery states can be achieved while independently executing corresponding charging strategies, thereby improving the flexibility of battery status management and the reliability of vehicle control.

[0061] S630: When the real-time voltage data, real-time temperature data, and state of charge change rate do not meet the preset abnormal conditions, the battery is determined to be in normal monitoring state.

[0062] Specifically, if no abnormal conditions are detected, the battery can be determined to be in a normal monitoring state. This can be understood as the battery being in a normal monitoring state when real-time voltage data, real-time temperature data, and the rate of change of state of charge are all within normal ranges. In this case, the vehicle can perform battery status checks at a lower monitoring frequency, thereby reducing the number of times the vehicle controller is woken up during sleep periods and the vehicle's static power consumption.

[0063] S640: Obtain the state of charge of the battery in its dormant state.

[0064] S650. Determine the battery charging state based on the relationship between the state of charge and the first preset state of charge and the second preset state of charge.

[0065] S660: When the battery is in the planned charging state, charge it according to the preset planned charging strategy.

[0066] Figure 7 This is a schematic flowchart illustrating another battery charging control method provided in an embodiment of the present invention. Based on the above embodiments, see... Figure 7 Optionally, the method includes: S710: Acquire real-time voltage data, real-time temperature data, and state of charge change rate of the battery in dormant state according to the monitoring frequency.

[0067] S720. When the real-time voltage data is lower than the first voltage threshold, determine that the battery is in an abnormal monitoring state; and / or, when the real-time temperature data is lower than the first temperature threshold, determine that the battery is in an abnormal monitoring state; and / or, when the state-of-charge rate of change is higher than the first rate of change threshold, determine that the battery is in an abnormal monitoring state.

[0068] Specifically, the first voltage threshold can represent the threshold for judging abnormal battery power loss; the first temperature threshold can represent the battery low-temperature risk threshold; and the first rate of change threshold can represent the battery abnormal discharge rate threshold. When the real-time voltage data is lower than the first voltage threshold, it indicates that the battery may be at risk of power loss; when the real-time temperature data is lower than the first temperature threshold, it indicates that the low-temperature environment may lead to a decrease in the battery's discharge capacity; and when the rate of change of state of charge is higher than the first rate of change threshold, it indicates that the vehicle may be experiencing abnormal static power consumption. Therefore, when any one of the three—real-time voltage data, real-time temperature data, and rate of change of state of charge—exceeds the threshold, the battery can be identified as being in an abnormal monitoring state, and the monitoring frequency of the battery can be increased.

[0069] S730: When the real-time voltage data, real-time temperature data, and state of charge change rate do not meet the preset abnormal conditions, the battery is determined to be in normal monitoring state.

[0070] S740: Obtain the state of charge of the battery in its dormant state.

[0071] S750. Determine the battery charging state based on the relationship between the state of charge and the first preset state of charge and the second preset state of charge.

[0072] S760: When the battery is in the planned charging state, charging is performed according to the preset planned charging strategy.

[0073] Figure 8 This is a schematic flowchart illustrating another battery charging control method provided in an embodiment of the present invention. Based on the above embodiments, see... Figure 8 Optionally, the method includes: S810: Obtain the state of charge of the battery in its dormant state.

[0074] S820. When the state of charge is greater than or equal to the first preset state of charge, determine that the battery is in a normal monitoring state.

[0075] S830. When the state of charge is greater than or equal to the second preset state of charge and less than the first preset state of charge, the battery is determined to be in a planned charging state.

[0076] S840. When the state of charge is less than the second preset state of charge, determine that the battery is in an immediate recharging state.

[0077] S850: When the battery is being recharged and under normal monitoring conditions, the battery is monitored at a preset monitoring frequency.

[0078] S860: When the battery is in the planned charging state, charging is performed according to the preset planned charging strategy.

[0079] S870, perform recharging when the battery is in an immediate recharging state.

[0080] S880: Recharge the battery when the battery reaches the third preset state of charge.

[0081] Specifically, the third preset state of charge (SOC) is greater than the first preset SOC. Alternatively, recharging is completed when the real-time battery voltage exceeds a second voltage threshold. The second voltage threshold is greater than the first voltage threshold. In other words, after recharging, the battery's SOC not only returns to a safe charge range but also retains a certain amount of charge margin. This reduces the probability that the battery will rapidly re-enter the planned or immediate recharging state due to continuous discharge during subsequent resting periods, thereby reducing the number of times the high-voltage system is repeatedly woken up and improving the power supply reliability during vehicle hibernation.

[0082] S890: After the battery is recharged, control the battery to return to the normal monitoring state.

[0083] Specifically, after the battery has been recharged, the high-voltage system can be disconnected, and the battery can be restored to its normal monitoring state. After being restored to the normal monitoring state, the vehicle can continue to monitor the battery status at a lower monitoring frequency, thereby reducing the static power consumption during the vehicle's dormancy period and reducing the number of high-voltage system operations.

[0084] Figure 9 This is a schematic diagram of a battery charging control device provided in an embodiment of the present invention. Figure 9As shown, the battery charging control device includes: an acquisition module 100, a judgment module 200, and a charging control module 300. The acquisition module 100 acquires the state of charge (SOC) of the battery in its dormant state. The judgment module 200 determines the battery's charging state based on the relationship between the SOC and a first preset SOC and a second preset SOC. The charging control module 300 performs charging according to a preset planned charging strategy when the battery's charging state is a planned charging state.

[0085] Specifically, the acquisition module 100 can be an intelligent battery sensor, which can be located at the negative terminal of the battery. The intelligent battery sensor communicates with the vehicle controller via a CAN bus to acquire data such as the battery's current state of charge, real-time voltage, real-time temperature, and rate of change of state of charge when the vehicle is in sleep mode, thus providing a data basis for subsequent charging status determination. The vehicle controller can connect to the high-voltage battery management system, DC-DC converter, and high-voltage distribution box via the CAN bus. The input of the DC-DC converter is connected to the 400V high-voltage power battery, and the output is connected to the 12V low-voltage electrical network and the positive terminal of the battery. The opening and closing of the high-voltage circuit is controlled by commands sent by the vehicle controller, and the high-voltage distribution box executes the closing and opening of the high-voltage main relay.

[0086] The judgment module 200 can be a microprocessor unit or a single-chip microcomputer with logic operation capabilities. It is used to determine the corresponding charging state of the battery based on the relationship between the state of charge and the first preset state of charge and the second preset state of charge. When the state of charge is greater than or equal to the first preset state of charge, it can be determined that the battery is in a normal monitoring state; when the state of charge is less than the first preset state of charge but greater than or equal to the second preset state of charge, it can be determined that the battery is in a planned charging state; when the state of charge is less than the second preset state of charge, it can be determined that the battery is in an immediate charging state.

[0087] The charging control module 300 can be a vehicle controller or other control unit with charging control function, used to control the high-voltage power battery to charge the battery when the battery is in a planned charging state or an immediate charging state.

[0088] The following is a specific embodiment illustrating the operation of the system, but it is not intended to limit the invention. After the vehicle is locked and put into sleep mode, the battery enters a normal monitoring state. The intelligent battery sensor wakes up every 60 minutes and measures the voltage. If the measured voltage is below 12.2V, i.e., the real-time voltage data is below the first voltage threshold, the vehicle controller determines that there is a possibility of low battery and enters an abnormal monitoring state. The intelligent battery sensor switches to monitoring every 10 minutes. When the vehicle controller recognizes that the current state of charge is 40%, the vehicle controller compares the state of charge with the first preset state of charge of 50% and the second preset state of charge of 30%. Since 40% is between 30% and 50%, the high-voltage battery management system generates a "planned charging request" with the current timestamp (2:00 AM). According to the preset strategy (e.g., to avoid charging noise at night, charging is delayed until after 6:00 AM), the high-voltage system does not perform charging temporarily, but continues high-frequency monitoring. Upon reaching 6:00 AM, the vehicle controller sends an "immediate power replenishment request," instructing the high-voltage battery management system to close the main negative relay in the high-voltage distribution box. This, in turn, causes the high-voltage distribution box to close the high-voltage main relay of the DC-DC converter, waking it up and starting the converter to charge the battery in a 14.2V constant voltage, current-limited mode. When the vehicle controller detects that the battery voltage reaches 13.8V (the second voltage threshold) or the high-voltage battery management system estimates that the state of charge (SOC) reaches 90% (the third preset SOC), charging the battery stops. The high-voltage system is then powered down, and the relevant controllers return to normal monitoring status, with the monitoring cycle resuming every 60 minutes.

[0089] Figure 10 This is a schematic diagram of a vehicle battery intelligent charging system provided in an embodiment of the present invention. Figure 10 As shown, the vehicle includes a battery charging control device and a high-voltage power battery system provided in this embodiment of the invention. The high-voltage power battery system is connected to the battery via a DC-DC converter; the high-voltage power battery system is used to charge the battery via the DC-DC converter according to the charging control device.

[0090] In this diagram, the red line represents the positive terminal, connecting the positive terminal of the high-voltage power battery to the positive terminal of the storage battery. The blue line represents the negative terminal, connecting the negative terminal of the high-voltage power battery to the negative terminal of the storage battery. Specifically, the high-voltage power battery and battery distribution box are connected to the high-voltage distribution box via high-voltage lines. The high-voltage distribution box is connected to the DC-DC converter via high-voltage lines. The DC-DC converter is connected to the storage battery via low-voltage lines. The intelligent battery sensor is connected to the storage battery via low-voltage lines. The vehicle controller communicates with the high-voltage battery management system, the high-voltage distribution box, the DC-DC converter, and the intelligent battery sensor via communication lines. The high-voltage battery management system communicates with the high-voltage power battery and battery distribution box via communication lines.

[0091] It should be understood that the various forms of processes shown above can be used, with steps reordered, added, or deleted. For example, the steps described in this invention can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this invention can be achieved, and this is not limited herein.

[0092] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A method of controlling recharging of a battery, characterized by, include: Obtain the state of charge of the battery in its dormant state; The charging state of the battery is determined based on the relationship between the state of charge and the first preset state of charge and the second preset state of charge; wherein the first preset state of charge is greater than the second preset state of charge. When the battery is in a planned charging state, charging is performed according to a preset planned charging strategy.

2. The power feeding control method of a storage battery according to claim 1, characterized by, The power replenishment status includes one of the following: normal monitoring status, planned power replenishment status, and immediate power replenishment status; Determining the battery's charging state based on the relationship between the state of charge and a first preset state of charge and a second preset state of charge includes: When the state of charge is greater than or equal to the first preset state of charge, the battery is determined to be in a normal monitoring state. When the state of charge is greater than or equal to the second preset state of charge and less than the first preset state of charge, the battery is determined to be in a planned charging state. When the state of charge is less than the second preset state of charge, the battery is determined to be in an immediate recharging state.

3. The power feeding control method of a storage battery according to claim 1, characterized by, When the battery is in a planned charging state, charging is performed according to a preset planned charging strategy, including: The target charging time period is determined based on the current time information and ambient temperature parameters corresponding to the battery. During the target charging period, the battery is charged via a high-voltage power battery.

4. The power feeding control method of a storage battery according to claim 2, characterized by Based on the current time information and ambient temperature parameters corresponding to the battery, the target charging time period is determined, including: When the current time information is at a preset time threshold, the target power replenishment period is delayed until after the preset time threshold.

5. The method of claim 2, wherein the method further comprises: Before obtaining the state of charge of the battery in its dormant state, the following steps are also included: The real-time voltage data, real-time temperature data, and state of charge change rate of the battery in dormant state are obtained based on the monitoring frequency. The monitoring status of the battery is determined based on the real-time voltage data, real-time temperature data, and the relationship between the rate of change of state of charge and the preset data threshold.

6. The power feeding control method of a storage battery according to claim 5, characterized by Based on the real-time voltage data, real-time temperature data, and the relationship between the rate of change of state of charge and a preset data threshold, the monitoring status of the battery is determined, including: When at least one of the real-time voltage data, the real-time temperature data, and the rate of change of state of charge meets a preset abnormal condition, the battery is determined to be in the abnormal monitoring state. When the real-time voltage data, the real-time temperature data, and the rate of change of state of charge do not meet the preset abnormal conditions, the battery is determined to be in the normal monitoring state. The monitoring frequency in the normal monitoring state is less than the monitoring frequency in the abnormal monitoring state.

7. The power feeding control method of a storage battery according to claim 6, characterized by When at least one of the real-time voltage data, the real-time temperature data, and the rate of change of state of charge meets a preset abnormal condition, the battery is determined to be in an abnormal monitoring state, including: When the real-time voltage data is lower than the first voltage threshold, it is determined that the battery is in an abnormal monitoring state; And / or, When the real-time temperature data is lower than the first temperature threshold, it is determined that the battery is in the abnormal monitoring state; And / or, If the rate of change of state of charge is higher than a first rate of change threshold, the battery is determined to be in the abnormal monitoring state.

8. The power feeding control method of a storage battery according to claim 2, characterized by, When the battery is in a planned charging state, charging is performed according to a preset planned charging strategy; or, after charging is performed when the battery is in an immediate charging state, the method further includes: The battery is recharged when it reaches a third preset state of charge; wherein the third preset state of charge is greater than the first preset state of charge. After the battery is recharged, the system controls the battery to return to the normal monitoring state.

9. A charge control device for a storage battery, characterized by comprising: include: The acquisition module is used to acquire the state of charge of the battery in its dormant state. The judgment module is used to determine the charging state of the battery based on the relationship between the state of charge and a first preset state of charge and a second preset state of charge; wherein the first preset state of charge is greater than the second preset state of charge. The battery replenishment control module is used to replenish the battery according to a preset planned replenishment strategy when the battery is in a planned replenishment state.

10. A vehicle characterized by comprising: include: The battery charging control device and high-voltage power battery system according to claim 9; the high-voltage power battery system is connected to the battery through a DC-DC converter; the high-voltage power battery system is used to charge the battery through the DC-DC converter according to the charging control device.

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