Method for performing supplementary charging on low-voltage storage battery of vehicle, and related device

Abstract

The present invention relates to the technical field of electric vehicle charging. Provided are a method for performing supplementary charging on a low-voltage storage battery of a vehicle, and a related device. The method comprises: after a vehicle is powered off, detecting whether a CAN of the vehicle is in a sleep state; when the CAN network is not in the sleep state, determining whether the vehicle meets a low-voltage supplementary charging trigger condition, wherein the low-voltage supplementary charging trigger condition comprises the voltage of a storage battery of the vehicle being less than a preset voltage and the number of instances of supplementary charging in a single power-off cycle not exceeding a preset number of instances; when the CAN is in the sleep state, acquiring a sleep time, so as to wake up the sleeping CAN when the sleep time satisfies a wake-up time; and when the vehicle meets the low-voltage supplementary charging trigger condition or the CAN in the sleep state is woken up, sending a low-voltage supplementary charging request, so as to perform supplementary charging on the vehicle.

Description

Vehicle low-voltage battery charging method and related device

[0001] Cross-reference to related applications

[0002] Embodiments of the present application are based on and claim priority from Chinese Patent Application No. 202410713077.7, filed on June 4, 2024, the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0003] The present application relates to the field of electric vehicle charging technology, and more particularly, to a vehicle low-voltage battery charging method, a vehicle low-voltage battery charging device, an electronic device, and a storage medium. BACKGROUND

[0004] After a vehicle is parked for a long time, the voltage of the low-voltage battery may decrease due to the consumption of the dark current of the vehicle, thereby causing the risk that the vehicle cannot be started normally.

[0005] To solve the above problem, the prior art sends a control vehicle start / power-on instruction to a vehicle-mounted communication box through a communication method such as a mobile phone APP when the conditions are met, interacts with the vehicle end using the vehicle-mounted communication box, controls the vehicle to request the high voltage to be OFF, charges the low-voltage battery through the power battery, and prolongs the time for starting the vehicle after the vehicle is parked for a long time.

[0006] However, the above technical solution needs to be triggered by the user actively, and there is uncertainty such as forgetting. Moreover, the precondition for the solution to be executed is that the vehicle has not run out of power, and the vehicle can also be started / power-on remotely. Once the vehicle has run out of power, the solution will not take effect.

[0007] Therefore, there is an urgent need for a new technical solution to solve the above technical problems. SUMMARY

[0008] In the prior art, a control vehicle start / power-on instruction is sent to a vehicle-mounted communication box through a communication method such as a mobile phone APP after the vehicle is parked for a long time, the vehicle-mounted communication box is used to interact with the vehicle end, the vehicle is controlled to request the high voltage to be OFF, the low-voltage battery is charged through the power battery, and the time for starting the vehicle after the vehicle is parked for a long time is prolonged. However, the above technical solution needs to be triggered by the user actively, and there is uncertainty such as forgetting. Moreover, the precondition for the solution to be executed is that the vehicle has not run out of power, and the vehicle can also be started / power-on remotely. Once the vehicle has run out of power, the solution will not take effect. The present application provides a vehicle low-voltage battery charging method, which automatically detects the voltage of the vehicle battery through the vehicle-mounted T-BOX without the need for the user to trigger it actively, thereby triggering the low-voltage charging, effectively solving the problem of battery running out of power after the vehicle is parked for a long time, reducing the risk that the user cannot use the vehicle, and improving the user's experience of using the vehicle.

[0009] A series of simplified concepts are introduced in the summary section, which will be further described in detail in the specific embodiment section. The summary section of the present application does not mean to attempt to define the key features and essential technical features of the claimed technical solutions, nor to attempt to determine the protection scope of the claimed technical solutions.

[0010] In a first aspect, the present application provides a vehicle low-voltage battery power supply method, comprising:

[0011] After the vehicle is powered off, it is detected whether the CAN network of the vehicle is in a sleep state;

[0012] When the CAN network is not in the sleep state, it is judged whether the vehicle satisfies a low-voltage power supply triggering condition, wherein the low-voltage power supply triggering condition includes that the battery voltage of the vehicle is less than a preset voltage and the number of power supply times in a single power-off cycle does not exceed a preset number;

[0013] When the CAN network is in the sleep state, a sleep time is obtained to wake up the sleeping CAN network when the sleep time satisfies a wake-up time;

[0014] When the vehicle satisfies the low-voltage power supply triggering condition or the sleeping CAN network is woken up, a low-voltage power supply request is sent to supply power to the vehicle.

[0015] In a second aspect, a vehicle low-voltage battery power supply device is also provided, comprising:

[0016] The detection module is configured to detect, after the vehicle is powered off, whether the CAN network of the vehicle is in a sleep state;

[0017] The judgment module is configured to, when the CAN network is not in the sleep state, judge whether the vehicle satisfies a low-voltage power supply triggering condition, wherein the low-voltage power supply triggering condition includes that the battery voltage of the vehicle is less than a preset voltage and the number of power supply times in a single power-off cycle does not exceed a preset number;

[0018] The acquisition module is configured to, when the CAN network is in the sleep state, obtain a sleep time to wake up the sleeping CAN network when the sleep time satisfies a wake-up time;

[0019] The power supply module is configured to, when the vehicle satisfies the low-voltage power supply triggering condition or the sleeping CAN network is woken up, send a low-voltage power supply request to supply power to the vehicle.

[0020] In a third aspect, an electronic device is also provided, comprising a processor and a memory, wherein the memory stores computer program instructions, and the computer program instructions are used to execute the vehicle low-voltage battery power supply method as described above when executed by the processor.

[0021] The fourth aspect also provides a storage medium, in which program instructions are stored, and the program instructions are used for executing the vehicle low-voltage battery power compensation method when running.

[0022] According to the technical solution, after the vehicle is powered off, it is detected whether the CAN network of the vehicle is in a sleep state; when the CAN network is not in the sleep state, it is judged whether the vehicle satisfies a low-voltage power compensation triggering condition, wherein the low-voltage power compensation triggering condition includes that the battery voltage of the vehicle is less than a preset voltage and the number of power compensation in a single power-off cycle does not exceed a preset number; when the CAN network is in the sleep state, a sleep time is obtained to wake up the sleeping CAN network when the sleep time satisfies a wake-up time; when the vehicle satisfies the low-voltage power compensation triggering condition or the sleeping CAN network is woken up, a low-voltage power compensation request is sent to compensate the vehicle. Thus, the voltage method and the time method can be used to automatically detect and judge the power of the vehicle battery through the vehicle T-BOX without active triggering of the user, so as to trigger the low-voltage power compensation, effectively solve the problem of battery power loss after long-term parking of the vehicle, reduce the risk that the user cannot use the vehicle, and improve the user experience of using the vehicle.

[0023] The vehicle low-voltage battery power compensation method, other advantages, objects and features of the present application will be embodied in part by the following description, and will be understood by those skilled in the art through research and practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0024] The accompanying drawings, which are incorporated into and form part of the specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the application.

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the accompanying drawings needed to be used in the embodiments or prior art description will be briefly introduced as follows. Obviously, those skilled in the art can obtain other drawings from these drawings without any creative effort.

[0026] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of exemplary embodiments. The accompanying drawings are included to provide a description of exemplary embodiments and are not meant to limit the present application. Moreover, the same reference numerals in the drawings indicate the same elements. In the drawings:

[0027] FIG. 1 shows a schematic flowchart of a vehicle low-voltage battery power compensation method according to an embodiment of the present application;

[0028] FIG. 2 shows a schematic flowchart of a vehicle low-voltage battery power compensation method according to another embodiment of the present application; and

[0029] Fig. 3 shows a schematic block diagram of a vehicle low-voltage battery charging device according to an embodiment of the application; and

[0030] Fig. 4 shows a schematic block diagram of an electronic device according to an embodiment of the application. Embodiments of the application

[0031] In order to more clearly understand the above-mentioned purposes, features and advantages of the present application, the schemes of the present application will be further described below. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0032] The terms "first", "second", "third", "fourth" and the like in the description and claims of the present application and in the above drawings (if any) are used to distinguish similar objects, and do not necessarily indicate a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments described herein can be implemented in other than the order illustrated or described herein. In addition, the terms "comprise" and "have" and any variations thereof, are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device that includes a list of steps or units does not necessarily limit to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to such processes, methods, products or devices. The technical solutions of the embodiments of the present application will be described clearly and completely below in conjunction with the drawings of the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all the embodiments.

[0033] In the following description, many specific details are set forth in order to provide a thorough understanding of the present application, but the present application can also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only a part of the embodiments of the present application, not all the embodiments.

[0034] In order to solve the above technical problems, according to a first aspect of the present application, a vehicle low-voltage battery charging method is provided. Fig. 1 shows a schematic flow chart of a vehicle low-voltage battery charging method 100 according to an embodiment of the present application. As shown in Fig. 1, the method 100 can include the following steps:

[0035] Step S110, after the vehicle is powered off, detecting whether the CAN network of the vehicle is in a sleep state.

[0036] Fig. 2 shows a schematic flow chart of vehicle low-voltage battery charging according to another embodiment of the present application. As shown in Fig. 2, the vehicle is considered to be powered off when the vehicle is switched from the ON gear to the OFF gear. At this time, the T-BOX is ready to enter the CAN sleep state, and preferably, a timer is started at this time. When the timer reaches the counted time, for example, 20 minutes, the T-BOX starts to determine whether the CAN network enters the sleep state.

[0037] Step S120, when the CAN network is not in the sleep state, determining whether the vehicle satisfies the low-voltage charging trigger condition, wherein the low-voltage charging trigger condition includes that the battery voltage of the vehicle is less than a preset voltage and the number of charging times in a single power-off cycle does not exceed a preset number.

[0038] If the CAN network is not in the sleep state, it is determined at this time whether the battery voltage of the vehicle is less than a preset voltage, for example, 12.6V, and whether the number of charging times in a single power-off cycle does not exceed a preset number, for example, 7 times.

[0039] Step S130, when the CAN network is in the sleep state, obtaining the sleep time to wake up the sleeping CAN network when the sleep time satisfies the wake-up time.

[0040] If the CAN network has been in the sleep state, the sleep time is obtained. Specifically, the T-BOX determines whether the vehicle has been in the sleep state for 5 days. If the vehicle has been in the sleep state for 5 days, it is considered that the sleep time satisfies the wake-up time, and at this time, the T-BOX wakes up the sleeping CAN network. The 5 days are only exemplary and do not mean a limitation on the wake-up time. In actual applications, the wake-up time can be reasonably set according to specific needs. If the vehicle has not been in the sleep state for 5 days, the T-BOX determines whether the CAN network has been woken up during this period. If the CAN network has been woken up, the timer is reset to zero and a new timing operation is started. If the CAN network has not been woken up, it is determined again whether the vehicle has been in the sleep state for 5 days.

[0041] Step S140, when the vehicle satisfies the low-voltage charging trigger condition or the sleeping CAN network is woken up, sending a low-voltage charging request to charge the vehicle.

[0042] If it is determined that the vehicle satisfies the low-voltage charging trigger condition through the above low-voltage charging trigger condition, or the sleeping CAN network is woken up, the T-BOX sends a low-voltage charging request CAN signal. At this time, the PDCU controls the OFF high voltage on the vehicle to charge the battery of the vehicle.

[0043] According to the technical solution, after the vehicle is powered off, it is detected whether the CAN network of the vehicle is in a sleep state; when the CAN network is not in the sleep state, it is judged whether the vehicle satisfies a low-voltage power compensation triggering condition, wherein the low-voltage power compensation triggering condition includes that the battery voltage of the vehicle is less than a preset voltage and the number of power compensation times in a single power-off cycle does not exceed a preset number; when the CAN network is in the sleep state, a sleep time is obtained to wake up the sleeping CAN network when the sleep time satisfies a wake-up time; when the vehicle satisfies the low-voltage power compensation triggering condition or the CAN network in the sleep state is woken up, a low-voltage power compensation request is sent to compensate the vehicle. Thus, based on the voltage method and the time method, without active triggering by the user, the vehicle battery power is automatically detected and judged by the vehicle-mounted T-BOX, so as to trigger low-voltage power compensation, effectively solve the problem of battery power loss after long-term parking of the vehicle, reduce the risk that the user cannot use the vehicle, and improve the user's vehicle experience.

[0044] Optionally, the step S140 of sending the low-voltage power compensation request to compensate the vehicle can include:

[0045] The step S141 includes: when the duration of the low-voltage power compensation request exceeds a preset time threshold, determining whether the current is in a power compensation state.

[0046] For example, the low-voltage power compensation request can be continuously sent, and when the duration of the low-voltage power compensation request exceeds a preset time threshold, for example, 12 seconds, it is determined whether the power compensation state of the PDCU is in the power compensation state, specifically, the T-BOX can be used to determine whether the power compensation state of the PDCU is switched to the power compensation state "1:12V charging".

[0047] The step S142 includes: if the power compensation state is in the power compensation state, starting to perform a first timing operation and continuously monitoring the power compensation state during the execution of the first timing operation.

[0048] If it has been switched to "1:12V charging", the T-BOX starts to perform the first timing operation, specifically, the time counted by the first timing operation can be preset to 60 minutes, and the timing mode is countdown, and during the 60-minute countdown, the T-BOX continuously judges the CAN signal value of the 12V power compensation state of the PDCU to realize continuous monitoring of the power compensation state.

[0049] The step S143 includes: if the power compensation state is not in the power compensation state, determining that the low-voltage power compensation request response fails.

[0050] If it has not been switched to "1:12V charging", it can be determined that the current is not in the power compensation state, at this time, the "low-voltage power compensation failure counter" of the T-BOX is incremented by 1, and it is determined that the low-voltage power compensation request response fails.

[0051] Step S144, based on the power compensation state and the number of times of low-voltage power compensation request response failure, determine whether to end the low-voltage power compensation process.

[0052] According to the foregoing, it can be determined whether the current is in the process of power compensation according to whether the CAN signal "12V charging" is equal to 1, and the number of times of low-voltage power compensation request response failure can also be determined. For example, when the number of times of low-voltage power compensation request response failure exceeds a preset number of times, for example, 3 times, the low-voltage power compensation process can be ended, otherwise, it can return to the CAN network wake-up step to start a new round of low-voltage power compensation operation.

[0053] Optionally, the power compensation state is continuously monitored during the execution of the first timing operation, including:

[0054] The power compensation state signal is obtained to determine the signal of the power compensation in progress state and the signal of the power compensation completion state as the power compensation success signal, and determine the signal of the no power compensation power input state and the signal of the power compensation error as the power compensation failure signal.

[0055] For example, when the CAN value = "0: no 12V charging", it can be determined that the current is in the no power compensation power input state, when the CAN value = "3: 12V charging error", it can be determined that the current is in the power compensation error state, and the signals of the above two states are both power compensation failure signals, at this time, the "low-voltage power compensation failure counter" of the T-BOX is incremented by 1. When the CAN value = "2: 12V charging finish", it can be determined that the current is in the power compensation completion state, and when the CAN value = "1: 12V charging", it can be determined that the current is in the power compensation in progress state, and the signals of the above two states are both power compensation success signals, at this time, the "low-voltage power compensation success counter" of the T-BOX is incremented by 1.

[0056] When the number of times of power compensation failure exceeds a preset power compensation failure number threshold, for example, 3 times, the low-voltage power compensation process can be ended. When the number of times of power compensation failure does not exceed the preset power compensation failure number threshold, a new low-voltage power compensation request is sent to start a new round of power compensation. Specifically, it can return to the CAN network wake-up step to start a new round of low-voltage power compensation operation.

[0057] Optionally, the method can further include: during a single power-off, each time the power compensation success number is increased, the CAN network is controlled to sleep.

[0058] For example, each time the low-voltage power compensation is successful, the T-BOX can set the low-voltage power compensation request to 0, stop sending messages, and control the CAN network to enter a sleep state. After sleeping for a period of time, for example, 10 minutes, the CAN network can be awakened again.

[0059] Optionally, after the T-BOX is ready to enter the sleep state, the CAN network is continuously detected whether it is in the sleep state. In combination with the foregoing description, the CAN network in the sleep state is woken up when the CAN network is in the sleep state and continuously sleeps for 5 days, and then a new low-voltage power compensation request is sent, and the next round of low-voltage power compensation process is restarted.

[0060] Optionally, the method can further include: during a single power-off, each time the power compensation success count is increased, the power compensation failure signal is cleared.

[0061] Illustratively, after each low-voltage power compensation success, the T-BOX can clear the low-voltage power compensation failure counter to clear the power compensation failure signal.

[0062] In this way, it can be avoided that although the low-voltage power compensation is successful, the power compensation failure count reaches the preset failure count threshold, causing the low-voltage power compensation process to end prematurely, affecting the power compensation amount of the battery and affecting the subsequent normal use of the vehicle by the user.

[0063] Optionally, the method can further include: after the vehicle is powered on, the power compensation success signal and the power compensation failure signal are cleared.

[0064] Illustratively, after each power-on of the vehicle, the low-voltage power compensation success counter and the low-voltage power compensation failure counter can be cleared to zero to clear the power compensation failure signal and the power compensation success signal, avoiding the influence of the power compensation success signal and the power compensation failure signal in the last low-voltage power compensation process on the current low-voltage power compensation process, causing power compensation failure or errors, etc. during the current execution of the low-voltage power compensation process after the vehicle is powered off again.

[0065] Optionally, before determining whether the vehicle meets the low-voltage power compensation triggering condition, the method can further include:

[0066] After obtaining the battery voltage of the vehicle, the battery voltage is filtered.

[0067] Any existing or future filtering operation can be used to filter the battery voltage to filter out invalid or interfering parts.

[0068] Based on the filtered voltage, the average voltage in a continuous preset time period is obtained.

[0069] After filtering the battery voltage, the average voltage in a continuous preset time period, for example, 10 seconds, is obtained. When the average voltage in 10 seconds is less than the preset voltage, it is determined that the battery voltage at this time is less than the preset voltage.

[0070] Therefore, a more accurate battery voltage can be obtained, and the average voltage of the continuous preset time period can be used to avoid the situation that the acquired battery voltage has low voltage accuracy due to external interference or detection errors, so as to reduce the contingency of voltage error and improve the reliability of low-voltage power compensation.

[0071] According to a second aspect of the present application, a vehicle low-voltage battery compensation device is further provided. FIG. 3 shows a schematic block diagram of a vehicle low-voltage battery compensation device 300 according to an embodiment of the present application. As shown in FIG. 3, the device 300 can include a detection module 310, a judgment module 320, an acquisition module 330, and a compensation module 340.

[0072] The detection module 310 is configured to detect whether the CAN network of the vehicle is in a sleep state after the vehicle is powered off.

[0073] The judgment module 320 is configured to judge whether the vehicle satisfies a low-voltage compensation triggering condition when the CAN network is not in the sleep state, wherein the low-voltage compensation triggering condition includes that the battery voltage of the vehicle is less than a preset voltage and the number of compensation times in a single power-off cycle does not exceed a preset number.

[0074] The acquisition module 330 is configured to acquire a sleep time when the CAN network is in the sleep state, and wake up the sleeping CAN network when the sleep time satisfies a wake-up time.

[0075] The compensation module 340 is configured to send a low-voltage compensation request to compensate the vehicle when the vehicle satisfies the low-voltage compensation triggering condition or the sleeping CAN network is woken up.

[0076] According to a third aspect of the present application, an electronic device is further provided. FIG. 4 shows a schematic block diagram of an electronic device 400 according to an embodiment of the present application. As shown in FIG. 4, the electronic device 400 can include a processor 410 and a memory 420. The memory 420 stores computer program instructions, which are run by the processor 410 to execute the vehicle low-voltage battery compensation method as described above.

[0077] According to a fourth aspect of the present application, a storage medium is further provided, which stores program instructions. The program instructions are run to execute the vehicle low-voltage battery compensation method as described above. The storage medium can include, for example, a storage component of a tablet computer, a hard disk of a computer, a read-only memory (ROM), an erasable programmable read-only memory (EPROM), a portable compact disc read-only memory (CD-ROM), a USB memory, or any combination of the above storage media. The computer-readable storage medium can be any combination of one or more computer-readable storage media.

[0078] The specific details and advantages of the vehicle low-voltage storage battery charging device, the electronic device and the storage medium can be understood by those skilled in the art by reading the above description of the vehicle low-voltage storage battery charging method. For brevity, they will not be repeated here.

[0079] In several embodiments provided in the present application, it should be understood that the disclosed apparatus and / or device can be implemented in other ways. For example, the apparatus embodiments described above are only schematic. The division of units is only a logical function division. Actual implementation can have another division manner. For example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the units shown or discussed can be indirect coupling or communication connection through some interface, device or unit, which can be electrical, mechanical or other form.

[0080] The units described as separate components can or can not be physically separate, and the components shown as units can or can not be physical units, i.e. they can be located in one place or distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the embodiment.

[0081] In addition, the functional units in each embodiment of the present application can be integrated in one processing unit, or each unit can exist physically, or two or more units can be integrated in one unit. The integrated unit can be realized in the form of hardware or in the form of software functional unit.

[0082] If the integrated unit is realized in the form of software functional unit and sold or used as an independent product, it can be stored in a computer readable storage medium. Based on this understanding, the technical solutions of the present application essentially or the part of the prior art that makes a contribution or the whole or part of the technical solutions can be embodied in the form of software product, which is stored in a storage medium and includes a plurality of instructions for making a computer device (which can be a personal computer, a server or a network device, etc.) execute all or part of the steps of the embodiments of the present application. The storage medium mentioned above includes U disk, mobile hard disk, read-only memory (ROM), random access memory (RAM), magnetic disk or optical disk and various program code storage media.

[0083] The above, the above examples are only used to illustrate the technical solutions of the application, and are not limited thereto; although the application is described in detail with reference to the foregoing examples, those of ordinary skill in the art should understand that the technical solutions recorded in the foregoing examples can still be modified, or some technical features therein can be replaced by equivalents; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the application.

Claims

1. A method for low-voltage battery charging of a vehicle, applied to an electronic device of the vehicle, comprising: detecting whether a CAN network of the vehicle is in a sleep state after the vehicle is powered off; judging whether the vehicle meets a low-voltage charging trigger condition when the CAN network is not in the sleep state, wherein the low-voltage charging trigger condition comprises that a battery voltage of the vehicle is less than a preset voltage and a number of charging times in a single power-off cycle does not exceed a preset number; acquiring a sleep time when the CAN network is in the sleep state, so as to wake up the sleeping CAN network when the sleep time meets a wake-up time; sending a low-voltage charging request to charge the vehicle when the vehicle meets the low-voltage charging trigger condition or the sleeping CAN network is woken up.

2. The vehicle low-voltage storage battery power-up method as recited in claim 1, wherein, The sending of the low-voltage charging request to charge the vehicle comprises: determining whether a current state is a charging state when a duration of the sending of the low-voltage charging request exceeds a preset time threshold; starting a first timing operation if the current state is the charging state, and continuously monitoring a charging state during the first timing operation; determining that the low-voltage charging request response fails if the current state is not the charging state; judging whether to end the low-voltage charging process based on the charging state and a number of times of the low-voltage charging request response failure.

3. The method of claim 2, wherein, The continuously monitoring of the charging state during the first timing operation comprises: acquiring a charging state signal to determine a charging success signal as a signal of the charging state and a signal of a charging completion state, and determine a charging failure signal as a signal of a state without charging power input and a signal of a charging error; The method further comprises: determining a number of times of charging failure and / or a number of times of charging success based on the charging success signal, the charging failure signal and a signal of the state not being the charging state after the first timing operation ends; ending the low-voltage charging process when the number of times of charging failure exceeds a preset number of times of charging failure threshold; sending a new low-voltage charging request to start a new round of charging when the number of times of charging failure does not exceed the preset number of times of charging failure threshold.

4. The method of claim 3, wherein, The method further comprises: controlling the CAN network to sleep when the number of times of charging success is increased once during a single power-off; continuously detecting whether the CAN network is in the sleep state to restart a next round of low-voltage charging process when the CAN network is in the sleep state and the sleep time meets the wake-up time.

5. The method of claim 3, wherein, The method further comprises: clearing the charging failure signal when the number of times of charging success is increased once during a single power-off.

6. The method of claim 3, wherein, The method further comprises: clearing the charging success signal and the charging failure signal after the vehicle is powered on.

7. The method of claim 1, wherein, Before the judging of whether the vehicle meets the low-voltage charging trigger condition, the method further comprises: filtering the battery voltage after acquiring the battery voltage of the vehicle; acquiring an average voltage in a continuous preset time period based on the filtered voltage. The method further comprises: When the average voltage is less than the preset voltage, it is determined that the battery voltage is less than the preset voltage.

8. A vehicle low-voltage battery charging device, comprising: a detection module configured to detect whether a CAN network of the vehicle is in a sleep state after the vehicle is powered off; a judgment module configured to judge whether the vehicle meets a low-voltage charging trigger condition when the CAN network is not in the sleep state, wherein the low-voltage charging trigger condition comprises that a battery voltage of the vehicle is less than a preset voltage and a number of charging times in a single power-off cycle is not more than a preset number; an acquisition module configured to acquire a sleep time when the CAN network is in the sleep state, and wake up the sleeping CAN network when the sleep time meets a wake-up time; a charging module configured to send a low-voltage charging request to charge the vehicle when the vehicle meets the low-voltage charging trigger condition or the sleeping CAN network is woken up.

9. An electronic device comprising a processor and a memory, wherein, The memory stores computer program instructions, and the computer program instructions are run by the processor to execute the vehicle low-voltage battery charging method of any one of claims 1 to 7.

10. A storage medium, which stores program instructions, and the program instructions are run to execute the vehicle low-voltage battery charging method of any one of claims 1 to 7.

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