Low-voltage battery charging method and vehicle

Abstract

The application relates to a low-voltage battery power supplementing method and a vehicle. The method comprises the following steps: a control component generates a power supplement request signal based on preset conditions, and transmits the power supplement request signal to a high-voltage battery; the preset conditions comprise at least one of the following: receiving a wake-up request signal of the low-voltage battery, receiving an online upgrading end signal, and low-voltage battery state information meeting a first charging condition; the high-voltage battery acquires high-voltage battery state information in response to the power supplement request signal, and charges the low-voltage battery based on the high-voltage battery state information and a second charging condition. The control component generates the power supplement request signal when any of the preset conditions is met by setting multiple preset conditions, so that the intelligent degree of low-voltage battery power supplementing is improved, and the low-voltage battery can be timely supplemented in special scenes.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of new energy vehicles, in particular to a low-voltage battery charging method and a vehicle. BACKGROUND

[0002] With the popularity of pure electric vehicles and hybrid electric vehicles, the degree of electrification of vehicles is continuously improved, thereby providing users with a more comfortable and convenient use experience. Pure electric vehicles and hybrid electric vehicles usually include a high-voltage battery and a low-voltage battery, wherein the high-voltage battery is the main power source of the vehicle, used to directly drive the motor to provide power, thereby determining the core indicators of the vehicle such as the cruising range and acceleration performance. The low-voltage battery supplies power to the low-voltage electrical system of the vehicle, such as lights, air conditioning, instrument panels, starting systems, etc., and is responsible for waking up the high-voltage battery and ensuring the basic functions of the vehicle.

[0003] The low-voltage battery is usually a 12V lithium battery, which is the core component of the low-voltage power supply system of the vehicle and plays an important role in vehicle starting and vehicle-mounted electronic device power supply. However, when the vehicle is parked for a long time or in a low-load running state, the 12V lithium battery may run out of power, which will cause the vehicle to fail to start normally or the vehicle-mounted electronic devices to fail to work normally. In the current related technology, the 12V lithium battery is charged, and the high-voltage battery is usually used to charge the 12V lithium battery at a preset time interval. This charging method has the problems of low intelligence and inability to charge in time for special scenarios. SUMMARY

[0004] Therefore, it is necessary to provide a low-voltage battery charging method and a vehicle to solve the above technical problems.

[0005] In a first aspect, the present application provides a low-voltage battery charging method applied to a low-voltage battery charging system, wherein the low-voltage battery charging system includes a low-voltage battery, a high-voltage battery, and a control component; the low-voltage battery and the high-voltage battery are connected with the control component; the low-voltage battery is connected with the high-voltage battery; the method includes: the control component generates a charging request signal based on a preset condition and transmits the charging request signal to the high-voltage battery; the preset condition includes at least one of receiving a wake-up request signal of the low-voltage battery, receiving an online upgrade end signal, and low-voltage battery state information meeting a first charging condition; the high-voltage battery responds to the charging request signal, acquires high-voltage battery state information, and charges the low-voltage battery based on the high-voltage battery state information and a second charging condition.

[0006] In one of the embodiments, the control component generating the power supplement request signal based on the preset condition comprises: the control component obtaining a power supply mode of the vehicle; if the power supply mode is a first power supply mode, the control component waking up the low-voltage battery through a first wake-up strategy and obtaining the low-voltage battery state information; if the power supply mode is a second power supply mode, the control component waking up the low-voltage battery through a second wake-up strategy and obtaining the low-voltage battery state information; if the low-voltage battery state information meets a first charging condition, the control component generating the power supplement request signal.

[0007] In one of the embodiments, if the low-voltage battery state information meets the first charging condition, the control component generating the power supplement request signal comprises: the low-voltage battery state information comprising a low-voltage battery voltage, a low-voltage battery temperature and a low-voltage battery remaining capacity; the first charging condition comprising a voltage condition, a temperature condition and a remaining capacity condition; if the low-voltage battery remaining capacity meets the remaining capacity condition and the low-voltage battery temperature meets the temperature condition, the control component generating the power supplement request signal; if the low-voltage battery voltage meets the voltage condition and the low-voltage battery temperature meets the temperature condition, the control component generating the power supplement request signal.

[0008] In one of the embodiments, the low-voltage battery voltage meeting the voltage condition comprises: the low-voltage battery state information further comprising a low-voltage battery current; the control component obtaining a voltage threshold mapping relationship; the voltage threshold mapping relationship comprising a mapping relationship among a battery temperature, a battery current and a voltage threshold; the control component determining a current voltage threshold according to the low-voltage battery current, the low-voltage battery temperature and the voltage threshold mapping relationship; if the low-voltage battery voltage is less than the current voltage threshold, the low-voltage battery voltage meeting the voltage condition.

[0009] In one of the embodiments, the control component generating the power supplement request signal based on the preset condition comprises: the low-voltage battery obtaining a low-voltage battery voltage, a low-voltage battery current, a low-voltage battery temperature, a low-voltage battery remaining capacity and a voltage threshold mapping relationship in real time; the low-voltage battery determining a current voltage threshold according to the low-voltage battery current, the low-voltage battery temperature and the voltage threshold mapping relationship; if the low-voltage battery voltage is less than the current voltage threshold or the low-voltage battery remaining capacity is less than a first remaining capacity threshold, the low-voltage battery generating a wake-up request signal and sending the wake-up request signal to the control component; the control component receiving the wake-up request signal and generating the power supplement request signal.

[0010] In one of the embodiments, the control component generates the power compensation request signal based on a preset condition, which includes: the control component acquires an online upgrade end signal; the online upgrade end signal includes: a low-voltage battery-powered online upgrade end signal and a high-voltage battery-powered online upgrade end signal; if the online upgrade end signal is the low-voltage battery-powered online upgrade end signal, the control component generates the power compensation request signal.

[0011] In one of the embodiments, the high-voltage battery acquires high-voltage battery state information in response to the power compensation request signal, and charges the low-voltage battery based on the high-voltage battery state information and a second charging condition, which includes: the high-voltage battery acquires high-voltage battery state information in response to the power compensation request signal; the high-voltage battery state information includes: fault state information, cabin cover state information, and high-voltage battery remaining power; if the high-voltage battery state information meets the second charging condition, the high-voltage battery charges the low-voltage battery; the second charging condition includes: the fault state information is no fault, the cabin cover state information is closed, and the high-voltage battery remaining power is greater than or equal to a second remaining power threshold.

[0012] In one of the embodiments, the method further includes: if the fault state information is fault, or the cabin cover state information is not closed, or the high-voltage battery remaining power is less than the second remaining power threshold, the high-voltage battery generates a power compensation disallowed signal and transmits the power compensation disallowed signal to the control component; the control component controls the power supply mode of the vehicle to enter the hibernation mode in response to the power compensation disallowed signal.

[0013] In one of the embodiments, the method further includes: the control component counts the number of consecutive times of receiving the power compensation disallowed signal; if the number of consecutive times of receiving the power compensation disallowed signal is greater than or equal to a preset number threshold, the control component stops executing the low-voltage battery power compensation method.

[0014] In one of the embodiments, the method further includes: during the process of charging the low-voltage battery by the high-voltage battery, the control component acquires the charging time, the low-voltage battery remaining power, the low-voltage battery temperature, and the power supply mode of the vehicle in real time; if the charging time is greater than a preset charging time threshold, or the low-voltage battery remaining power is greater than or equal to a third remaining power threshold, or the low-voltage battery temperature is less than or equal to a preset temperature threshold, or the power supply mode of the vehicle is a third power supply mode, the control component controls the high-voltage battery to stop charging the low-voltage battery and controls the power supply mode of the vehicle to enter the hibernation mode.

[0015] In a second aspect, the application provides a vehicle, which comprises a low-voltage battery charging system, the low-voltage battery charging system comprising a low-voltage battery, a high-voltage battery and a control component; the low-voltage battery and the high-voltage battery are connected with the control component respectively; the low-voltage battery is connected with the high-voltage battery; the vehicle is used to implement the low-voltage battery charging method in any of the above first aspects.

[0016] The low-voltage battery charging method is applied to a low-voltage battery charging system, which comprises a low-voltage battery, a high-voltage battery and a control component. The low-voltage battery and the high-voltage battery are connected with the control component respectively, and the low-voltage battery is connected with the high-voltage battery. The low-voltage battery charging method comprises: the control component generates a charging request signal based on a preset condition and transmits the charging request signal to the high-voltage battery. The preset condition comprises at least one of receiving a wake-up request signal of the low-voltage battery, receiving an online upgrade end signal and the low-voltage battery state information meeting a first charging condition. The high-voltage battery acquires high-voltage battery state information in response to the charging request signal and charges the low-voltage battery based on the high-voltage battery state information and a second charging condition. The control component sets multiple preset conditions, and generates the charging request signal when any of the preset conditions is met, thereby improving the intelligent degree of low-voltage battery charging and enabling timely low-voltage battery charging in special scenarios. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a flowchart of the low-voltage battery charging method in an embodiment;

[0018] Figure 2 It is a structural block diagram of the low-voltage battery charging system in an embodiment;

[0019] Figure 3 It is a flowchart of the charging request signal generation method in an embodiment;

[0020] Figure 4 It is a flowchart of the charging request signal generation method in another embodiment;

[0021] Figure 5 It is a flowchart of the charging request signal generation method in another embodiment;

[0022] Figure 6 It is a flowchart of the method for charging the low-voltage battery in an embodiment;

[0023] Figure 7 It is a flowchart of the low-voltage battery charging method based on the intelligent charging function in an embodiment;

[0024] Figure 8 It is a logic diagram of the intelligent charging function in an embodiment. DETAILED DESCRIPTION

[0025] In order to make the purposes, technical solutions and advantages of the present application clearer, further detailed description will be made to the present application in combination with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application, and are not used to limit the present application.

[0026] With the popularity of pure electric vehicles and hybrid electric vehicles, the degree of electrification of vehicles is continuously improved, thereby providing users with more comfortable and convenient use experience. Pure electric vehicles and hybrid electric vehicles usually include high-voltage batteries and low-voltage batteries, wherein the high-voltage batteries are the main power source of the vehicle, used to directly drive the motor to provide power, thereby determining the core indicators such as the cruising range and acceleration performance of the vehicle. The low-voltage battery supplies power to the low-voltage electrical system of the vehicle, such as lights, air conditioning, instrument panel, starting system, etc., and is responsible for waking up the high-voltage battery and guaranteeing the basic functions of the vehicle.

[0027] The low-voltage battery is usually a 12V lithium battery, which is the core component of the low-voltage power supply system of the vehicle and plays an important role in vehicle starting and vehicle-mounted electronic equipment power supply. However, when the vehicle is parked for a long time or in a low-load running state, the 12V lithium battery may run out of power, which will cause the vehicle to fail to start normally or the vehicle-mounted electronic equipment to fail to work normally.

[0028] The related art currently relies on a simple timing strategy to start the power compensation function when compensating the low-voltage battery, which has low automation and intelligence. And when the vehicle is parked for a long time or in a low-power state, the power compensation function is still frequently started, causing the body controller and other related modules to be in a working state for a long time, thereby increasing energy consumption. And when the power compensation function is started, the body controller and all other related hardware are awakened at the same time, further increasing energy consumption.

[0029] Based on the above, the embodiments of the present application provide a low-voltage battery power compensation method, which improves the automation and intelligence of low-voltage battery power compensation, and reduces energy consumption in the intelligent power compensation process.

[0030] In one embodiment, as shown in Figure 1 a low-voltage battery power compensation method is provided, including the following steps:

[0031] The low-voltage battery power compensation method is applied to a low-voltage battery power compensation system, as shown in Figure 2As shown, the low-voltage battery power compensation system comprises a low-voltage battery, a high-voltage battery, and a control assembly; the low-voltage battery and the high-voltage battery are connected with the control assembly respectively; the low-voltage battery is connected with the high-voltage battery. The low-voltage battery comprises a low-voltage battery cell and a low-voltage battery management system; the low-voltage battery cell is used to supply power for low-voltage electrical equipment in the vehicle; the low-voltage battery management system is used to intelligently manage and maintain each low-voltage battery cell and monitor the state of the low-voltage battery cell, that is, detect low-voltage battery state information. The high-voltage battery comprises a high-voltage battery cell and a high-voltage battery management system; the high-voltage battery cell is used to drive the vehicle motor to provide power; the high-voltage battery management system is used to intelligently manage and maintain each high-voltage battery cell and monitor the state of the high-voltage battery cell, that is, detect high-voltage battery state information. The control assembly can be any controller with data operation processing function arranged in the vehicle, for example, can be a body controller. The control assembly is used to coordinate the communication between the low-voltage battery and the high-voltage battery, the state monitoring, and the execution of the power compensation logic. The connection between the low-voltage battery and the high-voltage battery can make the high-voltage battery charge the low-voltage battery under the condition of meeting the condition.

[0032] In step 101, the control assembly generates a power compensation request signal based on a preset condition and transmits the power compensation request signal to the high-voltage battery.

[0033] The preset condition can be a condition that can trigger the control assembly to generate a power compensation request signal. Specifically, the preset condition includes at least one of receiving a wake-up request signal of the low-voltage battery, receiving an online upgrade end signal, and low-voltage battery state information meeting a first charging condition.

[0034] For receiving the wake-up request signal of the low-voltage battery, the low-voltage battery can detect the low-voltage battery state information in real time, which can include low-voltage battery voltage, low-voltage battery current, low-voltage battery temperature, and low-voltage battery remaining capacity. The low-voltage battery determines whether it needs to be charged according to the low-voltage battery state information, and if it needs to be charged, it generates a wake-up request signal and transmits the wake-up request signal to the control assembly. The control assembly can generate a power compensation request signal after receiving the wake-up request signal.

[0035] For receiving the online upgrade end signal, during the use process after the vehicle is purchased, the vehicle manufacturer usually releases an upgrade update package for the vehicle software system, at this time, the vehicle performs online upgrade on the software system of the vehicle through the OTA technology. And sends an online upgrade end signal to the control assembly after the online upgrade is completed. Since the OTA upgrade consumes a large amount of power, the control assembly generates a power compensation request signal immediately after receiving the online upgrade end signal.

[0036] In response to the low-voltage battery state information meeting the first charging condition, the control component acquires the low-voltage battery state information of the low-voltage battery at a preset time interval. After acquiring the low-voltage battery state information, the control component generates a power supplement request signal when the low-voltage battery state information meets the first charging condition. The first charging condition can include a remaining power condition, a temperature condition, and a voltage condition. When at least one of the low-voltage battery voltage, the low-voltage battery temperature, and the low-voltage battery remaining power in the low-voltage battery state information meets at least one of the voltage condition, the temperature condition, and the remaining power condition, the control component generates the power supplement request signal.

[0037] After generating the power supplement request signal, the control component transmits the power supplement request signal to the high-voltage battery. The power supplement request signal is used to inform the high-voltage battery that the low-voltage battery needs to be charged at this time and meets the charging condition.

[0038] In step 102, the high-voltage battery acquires high-voltage battery state information in response to the power supplement request signal and charges the low-voltage battery based on the high-voltage battery state information and the second charging condition.

[0039] After receiving the power supplement request signal, the high-voltage battery acquires high-voltage battery state information. The high-voltage battery state information includes parameters such as high-voltage battery voltage, high-voltage battery remaining power, high-voltage battery temperature, high-voltage battery health status, and high-voltage battery fault status. The second charging condition can include a remaining power condition, a fault status condition, and a voltage condition. When the high-voltage battery state information meets the second charging condition, it indicates that the state of the high-voltage battery at this time can support charging of the low-voltage battery. Then the high-voltage battery charges the low-voltage battery. During the charging of the low-voltage battery, the states of the high-voltage battery and the low-voltage battery can be monitored in real time to ensure the safety and stability of the charging process, thereby ensuring that the high-voltage battery provides stable power supplement support for the low-voltage battery without affecting its own performance.

[0040] The embodiment provides a low-voltage battery power supplement method. The control component can automatically generate a power supplement request signal according to actual needs by setting multiple preset conditions, thereby improving the intelligent degree of low-voltage battery power supplement and enabling timely low-voltage battery power supplement for special scenarios to avoid the limitations of the fixed time interval power supplement method in related technologies. For special scenarios such as long-term parking and low-load operation of a vehicle, the power supplement demand of the low-voltage battery can be quickly responded to, and the normal operation of the basic functions of the vehicle is ensured. By monitoring the high-voltage battery state information and combining the second charging condition, it is ensured that the charging of the low-voltage battery will not cause damage to the high-voltage battery. By supplementing the power of the low-voltage battery in a timely manner, the problem of the vehicle being unable to start or the electronic equipment being unable to work normally due to insufficient power of the low-voltage battery is avoided, and the user's experience is improved.

[0041] In one embodiment, the control component generates the power compensation request signal when the low-voltage battery state information meets the first charging condition. Figure 3 As shown in the figure, a power compensation request signal generation method is provided, comprising the following steps:

[0042] Step 301: The control component obtains the power mode of the vehicle.

[0043] The power mode Usage Mode of the vehicle includes five modes, specifically: abandoned mode Abandoned, inactive mode Inactive, convenience mode Convenience, abnormal mode Active, and driving mode Driving. When the vehicle is in the abandoned mode Abandoned, all power-consuming devices of the vehicle are in a dormant state; when the vehicle is in the inactive mode Inactive, only part of the low-energy-consumption functions of the vehicle are in an activated state; when the vehicle is in the convenience mode Convenience, the comfort functions such as lights, sound, and air conditioning are in an activated state; when the vehicle is being towed by a tow truck or is in after-sales maintenance, it is in the abnormal mode Active, which requires meeting a preset condition; when the vehicle is in the driving mode Driving, the power system is activated, and the full functions of the vehicle are in an activated state. When the power mode is the convenience mode Convenience, the abnormal mode Active, and the driving mode Driving, the vehicle is powered by the high-voltage battery; when the power mode is the abandoned mode Abandoned and the inactive mode Inactive, it is powered by the low-voltage battery. Since only in the abandoned mode Abandoned and the inactive mode Inactive does the low-voltage battery consume power, the control component only needs to periodically obtain the low-voltage battery state information in the abandoned mode Abandoned and the inactive mode Inactive.

[0044] Step 302: If the power mode is the first power mode, the control component wakes up the low-voltage battery through the first wake-up strategy and obtains the low-voltage battery state information.

[0045] The first power mode is the abandoned mode Abandoned. When the power mode is the abandoned mode, the first wake-up strategy corresponding to the abandoned mode is obtained, wherein the first wake-up strategy includes: waking up the low-voltage battery once every hour for the first 3 hours after the power mode enters the abandoned mode, and then waking up the low-voltage battery once every 2 hours. After obtaining the first wake-up strategy, the control component wakes up the low-voltage battery through the LIN bus according to the first wake-up strategy, and obtains the low-voltage battery state information corresponding to the low-voltage battery after waking up the low-voltage battery. The low-voltage battery state information includes parameters such as low-voltage battery voltage, low-voltage battery current, low-voltage battery temperature, and low-voltage battery remaining capacity.

[0046] In step 303, if the power mode is the second power mode, the control component wakes up the low-voltage battery through the second wake-up strategy and acquires low-voltage battery state information.

[0047] The second power mode is an inactive mode. When the power mode is the inactive mode, a second wake-up strategy corresponding to the inactive mode is acquired, wherein the second wake-up strategy comprises waking up the low-voltage battery at a preset time interval. The preset time interval is not limited in the embodiment, and an example of the preset time interval can be 5 minutes. After the second wake-up strategy is acquired, the control component wakes up the low-voltage battery through the LIN bus according to the second wake-up strategy, and acquires low-voltage battery state information corresponding to the low-voltage battery after waking up the low-voltage battery. The low-voltage battery state information comprises parameters such as low-voltage battery voltage, low-voltage battery current, low-voltage battery temperature, and low-voltage battery remaining capacity.

[0048] In step 304, if the low-voltage battery state information meets the first charging condition, the control component generates a power supplement request signal.

[0049] After acquiring the low-voltage battery state information, the control component needs to determine whether the low-voltage battery state information meets the first charging condition. When the first charging condition is met, it means that the low-voltage battery needs to be charged and meets the charging condition, and then the control component generates a power supplement request signal.

[0050] The embodiment sets different wake-up strategies for different power modes of the vehicle, which can adapt to the needs of the vehicle under different working conditions, improve the user experience and the reliability of the vehicle. The wake-up strategy only needs to wake up the local network, that is, only needs to wake up the low-voltage battery, which reduces the energy consumption of the power supplement detection. Through the intelligent interaction between the control component and the low-voltage battery, real-time monitoring and intelligent power supplement control of the low-voltage battery state are realized.

[0051] In one of the embodiments, determining whether the low-voltage battery state information meets the first charging condition comprises the following steps:

[0052] The low-voltage battery state information comprises low-voltage battery voltage, low-voltage battery current, low-voltage battery temperature, and low-voltage battery remaining capacity. The low-voltage battery voltage is the output voltage value of the low-voltage battery, and the low-voltage battery voltage can be used to determine whether the low-voltage battery is in an under-voltage state. The low-voltage battery current is the output current value of the low-voltage battery. The low-voltage battery temperature is the environmental temperature of the low-voltage battery. The low-voltage battery remaining capacity is the percentage of the current remaining capacity of the low-voltage battery to the total capacity of the battery. If the low-voltage battery remaining capacity is too low, the low-voltage battery may need to be charged in time.

[0053] The first charging condition includes a voltage condition, a temperature condition, and a remaining power condition. The voltage condition can be a threshold range that the low-voltage battery voltage needs to meet, used to determine whether the low-voltage battery is in an under-voltage state, thereby determining whether power needs to be supplemented. The temperature condition can be a safety range that the low-voltage battery temperature needs to meet, ensuring that the low-voltage battery is charged within a safe temperature range, avoiding performance degradation or damage due to overheating or overcooling. The remaining power condition can be a threshold range that the low-voltage battery remaining power needs to meet, used to determine whether the low-voltage battery needs to be supplemented. If the low-voltage battery remaining power is too low, it may need to be charged in time.

[0054] Step 1, if the low-voltage battery remaining power meets the remaining power condition, and the low-voltage battery temperature meets the temperature condition, the control component generates a power supplement request signal.

[0055] When the low-voltage battery remaining power meets the remaining power condition and the low-voltage battery temperature meets the temperature condition, the control component generates a power supplement request signal. For example, a temperature threshold and a remaining power threshold can be set; when the low-voltage battery remaining power is less than or equal to the remaining power threshold and the low-voltage battery temperature is greater than the temperature threshold, the power supplement request signal is generated. The temperature threshold and the remaining power threshold are not specifically limited in the embodiment, and for example, the remaining power threshold can be 65%, and the temperature threshold can be -35°C.

[0056] Step 2, if the low-voltage battery voltage meets the voltage condition, and the low-voltage battery temperature meets the temperature condition, the control component generates a power supplement request signal.

[0057] When the low-voltage battery voltage meets the voltage condition and the low-voltage battery temperature meets the temperature condition, the control component generates a power supplement request signal. For example, a voltage threshold and a temperature threshold can be set; when the low-voltage battery voltage is less than the voltage threshold and the low-voltage battery temperature is greater than the temperature threshold, the power supplement request signal is generated. The voltage threshold and the temperature threshold are not specifically limited in the embodiment, and for example, the temperature threshold can be -35°C.

[0058] Since the environment where the low-voltage battery is located is different, the voltage threshold in the voltage condition will also change. For example, the lower the low-voltage battery temperature is, the greater the low-voltage battery current is, and the lower the low-voltage battery voltage is. Therefore, the voltage threshold needs to be adjusted in real time according to the change of the low-voltage battery temperature and the low-voltage battery current, so as to more accurately determine the power compensation condition of the low-voltage battery. Specifically, the control component obtains a voltage threshold mapping relationship; the voltage threshold mapping relationship includes a mapping relationship between the battery temperature, the battery current and the voltage threshold. The mapping relationship can be a function curve of the battery current and the voltage threshold at different battery temperatures, for example, it can include a function curve of the battery current and the voltage threshold at-20℃, a function curve of the battery current and the voltage threshold at-10℃, and a function curve of the battery current and the voltage threshold at 25℃. Only the multiple battery temperatures in the mapping relationship need to cover the temperature range that the low-voltage battery can actually reach. Specifically, the test data of the same type of low-voltage battery can be obtained in advance, and the test data includes the battery temperature, the battery current and the voltage threshold, and the specific data is as follows:

[0059] -20℃ -10℃ 0℃ 10℃ 25℃ 40℃ 60℃ 0.625A 12.5V 12.7V 12.9V 13V 13V 13V 13V 1.25A 12.1V 12.4V 12.85V 13V 13V 13V 13V 12.5A 11.4V 11.9V 12.55V 12.8V 12.9V 12.9V 12.9V 20A 11V 11.7V 12.4V 12.75V 12.85V 12.85V 12.85V 37.5A 10.7V 11.5V 12.3V 12.7V 12.8V 12.8V 12.8V

[0060] In the above table, the first row is the battery temperature, the first column is the battery current, and the middle data is the voltage threshold corresponding to the battery temperature and the battery current. The mapping relationship is obtained by function fitting of the data in the above table. For example, the function curve of the battery current and the voltage threshold at-20℃, -10℃, 0℃, 10℃, 25℃, 40℃ and 60℃ is obtained by fitting. It can be understood that the above only takes 7 temperature function curves as an example, and more function curves corresponding to battery temperatures can be included in actual use. After obtaining the voltage threshold mapping relationship, the control component determines the current voltage threshold according to the low-voltage battery current, the low-voltage battery temperature and the voltage threshold mapping relationship. Specifically, the control component first finds the target function curve of the battery current and the voltage threshold at the corresponding battery temperature through the low-voltage battery temperature, and then determines the current voltage threshold through the low-voltage battery current and the target function curve. If the low-voltage battery voltage is less than the current voltage threshold, the low-voltage battery voltage meets the voltage condition.

[0061] This embodiment significantly improves the accuracy and safety of the low-voltage battery charging method by judging the first charging condition. The first charging condition considers not only the low-voltage battery voltage and remaining charge but also temperature, enabling a more comprehensive assessment of the battery's state. This multi-dimensional judgment avoids erroneous operations caused by a single condition triggering charging. Furthermore, the introduction of temperature conditions ensures that the charging function only operates within the low-voltage battery's safe operating temperature range, preventing battery damage due to overheating or overcooling. By dynamically adjusting the voltage threshold based on the low-voltage battery temperature and current, it adapts to the needs of different operating scenarios, avoiding misjudgments or missed judgments that might occur with a fixed voltage threshold.

[0062] In one embodiment, when the control component receives a wake-up request signal from the low-voltage battery, the control component generates a recharge request signal. Figure 4 As shown, a method for generating a power replenishment request signal is provided, including the following steps:

[0063] Step 401: The low-voltage battery acquires in real time the low-voltage battery voltage, low-voltage battery current, low-voltage battery temperature, low-voltage battery remaining power, and voltage threshold mapping relationship.

[0064] The low-voltage battery monitors its own status in real time. If it needs recharging, it can actively wake up the control component. The low-voltage battery acquires its voltage, current, temperature, remaining charge, and voltage threshold mapping in real time. The voltage threshold mapping is the same as described in the previous embodiment and will not be repeated here.

[0065] Step 402: The low-voltage battery determines the current voltage threshold based on the mapping relationship between the low-voltage battery current, the low-voltage battery temperature, and the voltage threshold.

[0066] The method for determining the current voltage threshold in this step is the same as that for determining the voltage threshold in the above embodiments. For a detailed explanation, please refer to the above embodiments, which will not be repeated here.

[0067] Step 403: If the low-voltage battery voltage is less than the current voltage threshold or the remaining power of the low-voltage battery is less than the first remaining power threshold, the low-voltage battery generates a wake-up request signal and sends the wake-up request signal to the control component.

[0068] The low-voltage battery generates a wake-up request signal and sends the wake-up request signal to the control component if the low-voltage battery voltage is less than the current voltage threshold after the low-voltage battery determines the current voltage threshold. The low-voltage battery generates a wake-up request signal and sends the wake-up request signal to the control component if the low-voltage battery remaining power is less than a first remaining power threshold. The first remaining power threshold needs to be set according to actual use requirements, and the embodiment is not limited, for example, the first remaining power threshold can be 65%.

[0069] In step 404, the control component receives the wake-up request signal and generates a power compensation request signal.

[0070] The low-voltage battery wakes up the control component through the wake-up request signal when it determines that it needs power compensation. The control component receives the wake-up request signal and directly generates a power compensation request signal. That is, there is no need to judge the first charging condition at this time.

[0071] The embodiment can dynamically adjust the voltage threshold by the low-voltage battery autonomously detecting state information such as low-voltage battery voltage, low-voltage battery current, low-voltage battery temperature, and low-voltage battery remaining power, and combining the voltage threshold mapping relationship. By setting two conditions of voltage and remaining power, the wake-up request signal can be generated in time when the low-voltage battery is under-voltage or power shortage, so as to ensure that the high-voltage battery can respond to the power compensation demand of the low-voltage battery in time. By combining the periodic wake-up of the low-voltage battery by the control component and the active wake-up of the control component by the low-voltage battery, intelligent power compensation can be started according to actual needs, and the response speed and reliability of power compensation are improved.

[0072] In one of the embodiments, when the control component receives the online upgrade end signal, the control component generates a power compensation request signal. As shown in Figure 5 A power compensation request signal generation method is provided, including the following steps:

[0073] In step 501, the control component obtains an online upgrade end signal.

[0074] Online upgrade, also known as OTA upgrade, when the vehicle completes online upgrade, the online upgrade system sends an online upgrade end signal to the control component. The online upgrade end signal is used to inform the control component that the online upgrade has been completed. The online upgrade end signal includes: a low-voltage battery powered online upgrade end signal and a high-voltage battery powered online upgrade end signal. Specifically, the low-voltage battery powered online upgrade end signal is used to indicate that this online upgrade is powered by the low-voltage battery; the high-voltage battery powered online upgrade end signal is used to indicate that this online upgrade is powered by the high-voltage battery.

[0075] In step 502, if the online upgrade end signal is a low-voltage battery powered online upgrade end signal, the control component generates a power compensation request signal.

[0076] After obtaining the online upgrade end signal, the control component first determines whether the online upgrade end signal is a low-voltage battery-powered online upgrade end signal. If it is a low-voltage battery-powered online upgrade end signal, the control component generates a power compensation request signal. If it is a high-voltage battery-powered online upgrade end signal, since the power of the low-voltage battery is not used during the OTA upgrade, the low-voltage battery does not need to be compensated. It can be understood that the online upgrade end signal is only used to indicate the end of online upgrade, that is, both online upgrade success and online upgrade failure will generate an online upgrade end signal. Therefore, whether the online upgrade is successful or the online upgrade fails, as long as the low-voltage battery is powered during the online upgrade, the control component generates a power compensation request signal.

[0077] The embodiment generates a power compensation request signal immediately after the online upgrade is completed, so as to ensure that the low-voltage battery can quickly recover the power after completing the power supply task, and avoid affecting the subsequent vehicle functions due to insufficient power.

[0078] In the related art, only the low-voltage battery state is used for power compensation detection, without considering special discharge scenarios. For example, the low-voltage battery is used for OTA upgrade. Since the low-voltage battery consumes a large amount of battery power during the OTA upgrade, and the remaining power of the low-voltage battery is not accurately detected during the OTA upgrade, the low-voltage battery needs to be compensated immediately after the OTA upgrade, so as to avoid performance loss of the low-voltage battery due to deep discharge.

[0079] In one embodiment, the control component monitors the power mode of the vehicle in real time. When the power mode is switched from any other power mode to the inactive mode, the control component wakes up the low-voltage battery and obtains the low-voltage battery state information. After obtaining the low-voltage battery state information, if the low-voltage battery state information meets the first charging condition, the control component generates a power compensation request signal.

[0080] In one embodiment, after the high-voltage battery receives the power compensation request signal, the high-voltage battery obtains high-voltage battery state information in response to the signal, and determines whether the high-voltage battery state information meets the second charging condition. If it meets, it means that the high-voltage battery meets the charging condition, and then the low-voltage battery is charged. Figure 6 As shown in the figure, a method for charging the low-voltage battery is provided, which specifically includes the following steps:

[0081] Step 601, the high-voltage battery obtains high-voltage battery state information in response to the power compensation request signal.

[0082] The high-voltage battery state information can be the current state and related parameters of the high-voltage battery, used to evaluate whether the high-voltage battery has the condition to charge the low-voltage battery. The high-voltage battery state information includes fault state information, cabin cover state information, and high-voltage battery remaining capacity. The fault state information indicates whether the high-voltage battery has a hardware or software fault, such as overheating, overvoltage, or short circuit. If there is a fault, the fault state information is fault; if there is no fault, the fault state information is no fault. The cabin cover state information indicates the opening and closing state of the vehicle cabin cover, which is usually detected by a sensor and fed back to the control component. If the cabin cover is in the closed state, the cabin cover state information is closed; if the cabin cover is in the open state, the cabin cover state information is not closed. The high-voltage battery remaining capacity indicates the percentage of the current remaining capacity of the high-voltage battery to the total capacity of the high-voltage battery.

[0083] In step 602, if the high-voltage battery state information meets the second charging condition, the high-voltage battery charges the low-voltage battery.

[0084] The second charging condition includes that the fault state information is no fault, the cabin cover state information is closed, and the high-voltage battery remaining capacity is greater than or equal to a second remaining capacity threshold. That is, after obtaining the high-voltage battery state information, if the fault state information is no fault, the cabin cover state information is closed, and the high-voltage battery remaining capacity is greater than or equal to the second remaining capacity threshold, it means that the high-voltage battery has the condition to charge the low-voltage battery at this time, and the high-voltage battery charges the low-voltage battery. The second remaining capacity threshold can be set according to actual use requirements, and the embodiment is not limited specifically.

[0085] The embodiment realizes precise control of the high-voltage battery charging behavior by judging whether the high-voltage battery state information meets the charging condition. By monitoring the fault state information and the cabin cover state information of the high-voltage battery, the safety hazards caused by the high-voltage battery fault or the opening of the cabin cover are avoided. By setting the second remaining capacity threshold, it is ensured that the high-voltage battery charges the low-voltage battery only when it has enough capacity, avoiding affecting the high-voltage battery itself.

[0086] In one of the embodiments, if the fault state information is fault, or the cabin cover state information is not closed, or the high-voltage battery remaining capacity is less than the second remaining capacity threshold, the high-voltage battery generates a no-recharge signal and transmits the no-recharge signal to the control component; the control component controls the power mode of the vehicle to enter the sleep mode in response to the no-recharge signal.

[0087] If the high-voltage battery state information meets at least one of the following conditions: the fault state information is fault, the cabin cover state information is not closed, or the remaining power of the high-voltage battery is less than the second remaining power threshold, it indicates that the high-voltage battery does not have the condition to charge the low-voltage battery at this time, the high-voltage battery generates a non-recharge signal, and transmits the non-recharge signal to the control component. After receiving the non-recharge signal, the control component controls the power mode Usage Mode of the vehicle to enter the abandoned mode. After sending the non-recharge signal to the control component, the high-voltage battery waits for the next recharge request signal sent by the control component, continues to acquire the high-voltage battery state information and detects.

[0088] In the case that the high-voltage battery does not meet the charging condition, the power mode of the vehicle is controlled to enter the abandoned mode. When the low-voltage battery is insufficient and the high-voltage battery cannot be used for charging, the vehicle is controlled to enter the abandoned mode, thereby reducing unnecessary energy consumption.

[0089] In one embodiment, the control component counts the number of consecutive non-recharge signals received; if the number of consecutive non-recharge signals received is greater than or equal to a preset number threshold, the control component stops executing the low-voltage battery recharge method.

[0090] After receiving the non-recharge signal, the control component counts the number of consecutive non-recharge signals received. When the number is greater than or equal to a preset number threshold, the control component stops executing the low-voltage battery recharge method. The preset number threshold can be set according to actual use requirements, and the embodiment is not limited. For example, the preset number threshold can be 3 times. The control component stops executing the low-voltage battery recharge method, that is, the control component no longer wakes up the low-voltage battery to acquire the low-voltage battery state information, and no longer generates a recharge request signal. When the control component detects that the vehicle is restarted or the DCDC of the high-voltage battery works for more than a preset time, the control component starts to execute the low-voltage battery recharge method again.

[0091] In this embodiment, when the high-voltage battery meets the charging condition for consecutive multiple times, the recharge function is prohibited, thereby avoiding unnecessary power consumption.

[0092] In one embodiment, during the process of charging the low-voltage battery by the high-voltage battery, the states of the low-voltage battery, the high-voltage battery, and the charging time need to be detected in real time to determine whether the charging needs to be stopped. Specifically, the following steps are included:

[0093] Step 1, during the process of charging the low-voltage battery by the high-voltage battery, the control component acquires the charging time, the remaining power of the low-voltage battery, the temperature of the low-voltage battery, and the power mode of the vehicle in real time.

[0094] During the charging process, the control component needs to obtain the charging time, the remaining power of the low-voltage battery, the temperature of the low-voltage battery, and the power mode of the vehicle in real time. The charging time can be the duration of charging the low-voltage battery by the high-voltage battery, which can be timed by a timer at the beginning of charging, so as to be obtained when needed. If the charging time is greater than a preset charging time threshold, it means that the charging of the low-voltage battery has been completed.

[0095] In step 2, if the charging time is greater than a preset charging time threshold, or the remaining power of the low-voltage battery is greater than or equal to a third remaining power threshold, or the temperature of the low-voltage battery is less than or equal to a preset temperature threshold, or the power mode of the vehicle is a third power mode, the control component controls the high-voltage battery to stop charging the low-voltage battery, and controls the power mode of the vehicle to enter the sleep mode.

[0096] After obtaining the above information, if the charging time is greater than a preset charging time threshold, the control component controls the high-voltage battery to stop charging the low-voltage battery, and controls the power mode of the vehicle to enter the sleep mode. The preset charging time threshold can be set according to actual use requirements, which is not limited in the embodiment. For example, the preset charging time threshold can be 1 hour. If the remaining power of the low-voltage battery is greater than or equal to a third remaining power threshold, the control component controls the high-voltage battery to stop charging the low-voltage battery, and controls the power mode of the vehicle to enter the sleep mode. The third remaining power threshold can be set according to actual use requirements, which is not limited in the embodiment. For example, the third remaining power threshold can be 100%. If the temperature of the low-voltage battery is less than or equal to a preset temperature threshold, the control component controls the high-voltage battery to stop charging the low-voltage battery, and controls the power mode of the vehicle to enter the sleep mode. The preset temperature threshold can be set according to actual use requirements, which is not limited in the embodiment. For example, the preset temperature threshold can be -35℃. If the power mode of the vehicle is switched from other modes to a third power mode, the control component controls the high-voltage battery to stop charging the low-voltage battery. The third power mode is the driving mode.

[0097] It can be understood that during the charging process of the high-voltage battery to the low-voltage battery, the high-voltage battery obtains the high-voltage battery state information in real time. If the high-voltage battery state information does not meet the second charging condition, the high-voltage battery stops charging the low-voltage battery, and controls the power mode of the vehicle to enter the sleep mode.

[0098] In one of the embodiments, if the control component generates a power supply request signal based on the wake-up request signal of the low-voltage battery or the online upgrade end signal, and charges the low-voltage battery through the high-voltage battery, the low-voltage battery remaining power does not need to be judged, and only the charging time needs to reach 30 minutes.

[0099] In one specific embodiment, the intelligent power compensation function provided by the present embodiment refers to a function that when the 12V lithium battery, i.e. the low-voltage battery, of the vehicle in the parked state has a low battery level or voltage, the high-voltage battery is requested to activate the DC-DC to charge the 12V lithium battery. The function is realized by the body controller, i.e. the control component, receiving the SOC, temperature, current and voltage of the 12V lithium battery through LIN communication to determine whether to send a power compensation request signal to the high-voltage battery. When the normal power compensation ends or the power compensation condition of the high-voltage battery is not met, the body controller controls the vehicle to enter the hibernation state. The intelligent power compensation function is a standard function of plug-in hybrid electric vehicles (PHEV) and electric vehicles (EV), and the vehicle models that cancel the one-key start switch have already realized the design of high-voltage on the vehicle door. Therefore, when the vehicle is in the convenience mode, the active mode and the driving mode, it is powered by the high-voltage battery. Therefore, the intelligent power compensation function only monitors the low-voltage battery state information of the 12V lithium battery in the hibernation mode and the inactive mode. Moreover, the low-voltage battery state information of the intelligent power compensation of the present embodiment is cyclically detected, and the local network is woken up, i.e. only the body controller and the 12V lithium battery are woken up each time the low-voltage battery state information of the 12V lithium battery is detected, and the current during the wake-up period is only in the order of milliamperes, which greatly reduces the power consumption.

[0100] As Figure 7As shown, a low-voltage battery power compensation method based on intelligent power compensation function is provided, which realizes real-time monitoring and intelligent power compensation control of the 12V lithium battery through intelligent interaction between the vehicle body controller and the 12V lithium battery. The vehicle body controller periodically wakes up through the LIN bus and receives the low-voltage battery state information of the 12V lithium battery based on the timing wake-up mode. The low-voltage battery state information includes SOC, voltage, current, temperature, etc. The vehicle body controller determines whether the low-voltage battery meets the power compensation condition according to the received low-voltage battery state information, that is, whether the intelligent power compensation function needs to be started. If the low-voltage battery meets the power compensation condition, that is, the intelligent power compensation function needs to be started, the vehicle body controller sends a power compensation request signal to the high-voltage battery. If the low-voltage battery does not meet the power compensation condition, the vehicle sleeps and waits to enter the next cycle. After receiving the power compensation request signal, the high-voltage battery needs to determine whether the high-voltage battery meets the power compensation condition. If the high-voltage battery meets the power compensation condition, the high-voltage battery activates the DC-DC to compensate the 12V lithium battery. If the high-voltage battery does not meet the power compensation condition, the high-voltage battery returns a power compensation NOK signal to the vehicle body controller. The vehicle body controller receives the power compensation NOK signal. If the power compensation NOK signal is received less than 3 times in succession, the vehicle sleeps and waits to enter the next cycle. If the power compensation NOK signal is received more than or equal to 3 times in succession, the power compensation function is disabled, and when the vehicle is restarted or the DC-DC works for more than 5 seconds, the power compensation function is enabled, and the vehicle sleeps and waits to enter the next cycle. During the process of charging the low-voltage battery with the high-voltage battery, the low-voltage battery state information of the 12V lithium battery and the high-voltage battery state information of the high-voltage battery are continuously monitored. When the 12V lithium battery is fully charged, or the charging time reaches the preset charging time threshold, or the low-voltage battery state information does not meet the power compensation condition, or the high-voltage battery state information does not meet the power compensation condition, the charging is stopped and the vehicle enters the sleep mode.

[0101] In one embodiment, the 12V lithium battery can detect its remaining power or voltage. When the remaining power is lower than the threshold or the voltage is lower than the threshold, the vehicle body controller is actively woken up to start the intelligent power compensation function.

[0102] In one embodiment, after the OTA installation using the low-voltage battery power is completed, the vehicle body controller is woken up to start the intelligent power compensation function. After the OTA powered by the low-voltage battery is completed, the remaining power and voltage of the 12V lithium battery do not need to be judged, and the vehicle body controller immediately sends a power compensation request signal.

[0103] As Figure 8As shown, a smart power compensation function logic diagram is provided. The body controller obtains the state information of the 12V lithium battery through a smart power compensation detection cycle. Among them, the smart power compensation detection cycle includes: 1. When the power mode Usage Mode of the vehicle is in the abandoned mode, the body controller detects the power compensation condition once every hour in the first 3 hours, and then detects the power compensation condition once every 2 hours. 2. When the power mode Usage Mode of the vehicle is in the inactive mode, the body controller detects the power compensation condition once every 5 minutes. 3. When the power mode Usage Mode of the vehicle is in the abandoned mode, the 12V lithium battery detects its remaining power or voltage, and if the remaining power is too low or the voltage is too low, the 12V lithium battery wakes up the body controller to send a power compensation request. 4. When the power mode of the vehicle is switched to the inactive mode from other modes, the power compensation condition is detected once. 5. The low-voltage battery power is used for OTA writing, and the smart power compensation is activated immediately after the OTA is completed. The body controller receives the state information of the 12V lithium battery and judges whether the low-voltage battery meets the charging condition. Among them, the low-voltage battery meets the charging condition includes: 1. The 12V lithium battery SOC of the vehicle is less than or equal to 65%, and the 12V lithium battery temperature is greater than -35℃. 2. The voltage of the lithium battery is lower than the voltage threshold, and the 12V lithium battery temperature is greater than -35℃. If one of the above two conditions is met, it is considered that the low-voltage battery meets the charging condition. Among them, the voltage threshold is determined by the voltage threshold mapping relationship. When the low-voltage battery meets the charging condition, the body controller sends a power compensation request signal to the high-voltage battery. The high-voltage battery responds to the power compensation request signal and judges whether the high-voltage battery meets the charging condition. Among them, the high-voltage battery meets the charging condition includes: 1. The high-voltage system is fault-free. 2. The cabin cover is closed. 3. The high-voltage battery SOC is greater than a preset threshold. If the above three conditions are met, it is considered that the high-voltage battery meets the charging condition. The high-voltage battery meets the charging condition to activate the DC-DC to compensate the 12V lithium battery. During the charging process of the low-voltage battery by the high-voltage battery, the smart power compensation function exit condition is judged in real time. Among them, the smart power compensation function exit condition includes: 1. The 12V lithium battery SOC is greater than or equal to 100%. 2. The power compensation time exceeds 1 hour. 3. The 12V lithium battery temperature is less than or equal to -35℃. 4. The vehicle mode is switched to driving. 5. The high-voltage battery does not meet the charging condition. If one of the above five conditions is met, it is considered that the smart power compensation function exit condition is met, and the high-voltage battery stops compensating the low-voltage battery. According to the power compensation activated by the low-voltage battery initiative or the OTA condition, the exit condition is not judged by the SOC, and the compensation is exited according to the compensation time exceeding 30 minutes.

[0104] The low-voltage battery power supply method based on the intelligent power supply function has high intelligence and high reliability, optimizes the energy management strategy while improving the reliability of the low-voltage power supply system of the vehicle, and has wide application prospects and market value. The real-time monitoring and intelligent power supply control of the battery state are realized through the intelligent interaction between the body controller and the 12V lithium battery. The combination of periodic wake-up and active wake-up improves the response speed and reliability. The energy management strategy is optimized under the premise of ensuring the safety of the battery, prolonging the service life of the battery and reducing the energy consumption. And it can adapt to the needs of the vehicle under different working conditions, improve the user experience and the reliability of the vehicle.

[0105] It should be understood that, although each step in the flowchart involved in each embodiment as described above is displayed in sequence according to the arrow, these steps are not necessarily executed in sequence according to the arrow. Unless otherwise specified herein, the execution of these steps is not strictly limited in sequence, and these steps can be executed in other sequences. Moreover, at least part of the steps in the flowchart involved in each embodiment as described above can include multiple steps or stages, which are not necessarily executed at the same time, but can be executed at different times, and the execution sequence of these steps or stages is not necessarily sequential, but can be executed alternately or alternately with at least part of other steps or steps or stages in other steps.

[0106] In one of the embodiments, a vehicle is provided, which comprises a low-voltage battery power supply system, the low-voltage battery power supply system comprising a low-voltage battery, a high-voltage battery and a control assembly; the low-voltage battery and the high-voltage battery are connected with the control assembly; the low-voltage battery is connected with the high-voltage battery; the vehicle is used to implement the low-voltage battery power supply method in any of the above embodiments. Based on the same inventive concept, the embodiments of the present application also provide a vehicle for implementing the above-mentioned low-voltage battery power supply method. The vehicle provides a solution to the implementation scheme similar to the implementation scheme described in the above method, and the vehicle is used to implement any of the above low-voltage battery power supply methods. For specific low-voltage battery power supply methods, refer to the description of the above embodiments, which will not be repeated here.

[0107] Those skilled in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a non-volatile computer readable storage medium, and when the computer program is executed, the processes of the above-mentioned embodiments of the methods can be included. Any reference to memory, database or other medium used in the embodiments provided in the present application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (Read-Only Memory, ROM), magnetic tape, floppy disk, flash memory, optical storage, high-density embedded non-volatile memory, resistive memory (ReRAM), magnetoresistive random access memory (Magnetoresistive Random Access Memory, MRAM), ferroelectric memory (Ferroelectric Random Access Memory, FRAM), phase change memory (Phase Change Memory, PCM), graphene memory, etc. Volatile memory can include random access memory (Random Access Memory, RAM) or external cache memory, etc. As an illustration but not limitation, RAM can be in various forms, such as static random access memory (Static Random Access Memory, SRAM) or dynamic random access memory (Dynamic Random Access Memory, DRAM), etc. The database involved in the embodiments provided in the present application can include at least one of a relational database and a non-relational database. The non-relational database can include a distributed database based on a block chain, etc., without being limited thereto. The processor involved in the embodiments provided in the present application can be a general-purpose processor, a central processing unit, a graphics processing unit, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, etc., without being limited thereto.

[0108] Any combination of the technical features of the above embodiments can be made. In order to make the description simple, all possible combinations of the technical features in the above embodiments are not described, however, as long as the combination of the technical features does not exist contradictory, it should be considered as the scope of the present application.

[0109] The above embodiments only express several implementation manners of the present application, and the description is more specific and detailed, but it should not be understood as a limitation on the scope of the patent of the present application. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which are within the scope of protection of the present application. Therefore, the protection scope of the present application should be subject to the appended claims.

Claims

1. A low-voltage battery recharging method, characterized by, The application is applied to a low-voltage battery power supply system, which comprises a low-voltage battery, a high-voltage battery and a control component; The low-voltage battery and the high-voltage battery are connected with the control component respectively; The low-voltage battery is connected with the high-voltage battery; the method comprises: The control component generates a power supply request signal based on a preset condition and transmits the power supply request signal to the high-voltage battery; the preset condition comprises at least one of the following: receiving a wake-up request signal of the low-voltage battery, receiving an online upgrade end signal and low-voltage battery state information meeting a first charging condition; the first charging condition comprises a voltage condition, a temperature condition and a remaining power condition; The high-voltage battery responds to the power supply request signal, acquires high-voltage battery state information and charges the low-voltage battery based on the high-voltage battery state information and a second charging condition; the second charging condition comprises that fault state information is no fault, cabin cover state information is closed and the high-voltage battery remaining power is greater than or equal to a second remaining power threshold value; The control component generates a power supply request signal based on a preset condition, which comprises that the low-voltage battery acquires low-voltage battery voltage, low-voltage battery current, low-voltage battery temperature, low-voltage battery remaining power and voltage threshold mapping relationship in real time; the low-voltage battery determines a current voltage threshold value according to the low-voltage battery current, low-voltage battery temperature and voltage threshold mapping relationship; if the low-voltage battery voltage is less than the current voltage threshold value or the low-voltage battery remaining power is less than a first remaining power threshold value, the low-voltage battery generates a wake-up request signal and sends the wake-up request signal to the control component; the control component receives the wake-up request signal and generates a power supply request signal; the voltage threshold mapping relationship comprises a mapping relationship among battery temperature, battery current and voltage threshold value; Or the control component generates a power supply request signal based on a preset condition, which comprises that the control component acquires an online upgrade end signal; the online upgrade end signal comprises an online upgrade end signal powered by the low-voltage battery and an online upgrade end signal powered by the high-voltage battery; if the online upgrade end signal is the online upgrade end signal powered by the low-voltage battery, the control component generates a power supply request signal.

2. The method of claim 1, wherein, The control component generates a power supply request signal based on a preset condition, which comprises: The control component acquires a power supply mode of a vehicle; If the power supply mode is a first power supply mode, the control component wakes up the low-voltage battery through a first wake-up strategy and acquires low-voltage battery state information; If the power supply mode is a second power supply mode, the control component wakes up the low-voltage battery through a second wake-up strategy and acquires low-voltage battery state information; If the low-voltage battery state information meets a first charging condition, the control component generates the power supply request signal.

3. The method of claim 2, wherein, If the low-voltage battery state information meets a first charging condition, the control component generates the power supply request signal, which comprises that the low-voltage battery state information comprises low-voltage battery voltage, low-voltage battery temperature and low-voltage battery remaining power; The control component generates the power supplement request signal if the low-voltage battery remaining power meets the remaining power condition and the low-voltage battery temperature meets the temperature condition. The control component generates the power supplement request signal if the low-voltage battery voltage meets the voltage condition and the low-voltage battery temperature meets the temperature condition.

4. The method of claim 3, wherein, The low-voltage battery voltage meeting the voltage condition comprises that the low-voltage battery state information further comprises a low-voltage battery current. The control component acquires a voltage threshold mapping relationship. The control component determines a current voltage threshold according to the low-voltage battery current, the low-voltage battery temperature, and the voltage threshold mapping relationship. The low-voltage battery voltage meets the voltage condition if the low-voltage battery voltage is less than the current voltage threshold.

5. The method of claim 1, wherein, The high-voltage battery, in response to the power supplement request signal, acquires high-voltage battery state information and charges the low-voltage battery based on the high-voltage battery state information and a second charging condition, comprising: The high-voltage battery, in response to the power supplement request signal, acquires high-voltage battery state information; the high-voltage battery state information comprises fault state information, cabin cover state information, and high-voltage battery remaining power. The high-voltage battery charges the low-voltage battery if the high-voltage battery state information meets the second charging condition.

6. The method of claim 5, wherein, The method further comprises: The high-voltage battery generates a power supplement disallowed signal and transmits the power supplement disallowed signal to the control component if the fault state information is fault, or the cabin cover state information is not closed, or the high-voltage battery remaining power is less than a second remaining power threshold; The control component controls the power supply mode of the vehicle to enter a hibernation mode in response to the power supplement disallowed signal.

7. The method of claim 6, wherein, The method further comprises: The control component counts the number of times of continuously receiving the power supplement disallowed signal; The control component stops executing the low-voltage battery power supplement method if the number of times of continuously receiving the power supplement disallowed signal is greater than or equal to a preset number threshold.

8. The method of claim 1, wherein, The method further comprises: The control component acquires a charging time, a low-voltage battery remaining power, a low-voltage battery temperature, and a power supply mode of the vehicle in real time during the charging of the low-voltage battery by the high-voltage battery; The control component controls the high-voltage battery to stop charging the low-voltage battery and controls the power supply mode of the vehicle to enter a hibernation mode if the charging time is greater than a preset charging time threshold, or the low-voltage battery remaining power is greater than or equal to a third remaining power threshold, or the low-voltage battery temperature is less than or equal to a preset temperature threshold, or the power supply mode of the vehicle is a third power supply mode.

9. A vehicle characterized by comprising: The vehicle comprises a low-voltage battery power supplement system, the low-voltage battery power supplement system comprising a low-voltage battery, a high-voltage battery, and a control component; the low-voltage battery and the high-voltage battery are connected with the control component; the low-voltage battery is connected with the high-voltage battery; and the vehicle is configured to implement the low-voltage battery power supplement method of any one of claims 1-8.

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