Vehicle low-voltage storage battery charging method and related device

Abstract

The application provides a vehicle low-voltage storage battery power compensation method and related equipment, and relates to the technical field of electric vehicle charging. The method comprises the following steps: 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 trigger condition, wherein the low-voltage power compensation trigger condition comprises that the voltage of the storage battery 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, the 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 trigger condition or the sleeping CAN network is woken up, a low-voltage power compensation request is sent to compensate the vehicle. Thus, without the active triggering of the user, the power of the vehicle storage battery is automatically detected and judged by the T-BOX to trigger the low-voltage power compensation, thereby reducing the risk that the user cannot use the vehicle and improving the user's vehicle experience.

Description

Technical Field

[0001] This invention relates to the field of electric vehicle charging technology, and more specifically, to a method for replenishing a vehicle's low-voltage battery, a device for replenishing a vehicle's low-voltage battery, an electronic device, and a storage medium. Background Technology

[0002] After a vehicle has been sitting idle for a long time, the low-voltage battery may become depleted due to the loss of dark current throughout the vehicle, which may cause the vehicle to fail to start.

[0003] To address the aforementioned issues, existing technologies, when certain conditions are met, send vehicle start / power-on commands to the vehicle communication box via a mobile app or other communication method. The vehicle communication box then interacts with the vehicle to request the vehicle to switch off the high voltage, allowing the power battery to charge the low-voltage battery, thereby extending the time before the vehicle can be restarted after being idle.

[0004] However, the above technical solution requires the user to actively trigger it, which is subject to uncertainty such as forgetting. Furthermore, the solution can only be implemented if the vehicle is not out of power and can be remotely started / powered on. Once the vehicle is out of power, the solution will not work.

[0005] Therefore, a new technical solution is urgently needed to solve the above-mentioned technical problems. Summary of the Invention

[0006] In existing technologies, after a vehicle has been parked for an extended period, a start / power-on command is sent to the vehicle's communication box via a mobile app or other communication method. The communication box then interacts with the vehicle to request the high-voltage battery to be switched off, allowing the low-voltage battery to be charged via the mains battery, thus extending the time before the vehicle can be restarted. However, this method requires active user intervention, which is subject to uncertainty such as forgetting to activate the battery. Furthermore, this method only works if the vehicle is not completely discharged and can be remotely started / powered on; if the vehicle is already discharged, the method will not be effective. This invention proposes a method for replenishing the low-voltage battery of a vehicle. Using voltage and time methods, this method eliminates the need for active user intervention. The vehicle's T-BOX automatically detects the battery level and triggers low-voltage replenishment, effectively solving the problem of battery discharge after long-term parking, reducing the risk of users being unable to use their vehicles, and improving the user experience.

[0007] The summary section introduces a series of simplified concepts, which will be further explained in detail in the detailed description section. The summary section of this invention is not intended to limit the key features and essential technical features of the claimed technical solution, nor is it intended to determine the scope of protection of the claimed technical solution.

[0008] In a first aspect, the present invention proposes a method for replenishing a low-voltage battery in a vehicle, comprising:

[0009] After the vehicle is powered off, check whether the vehicle's CAN network is in a sleep state;

[0010] When the CAN network is not in a dormant state, determine whether the vehicle meets the low-voltage power replenishment trigger conditions. The low-voltage power replenishment trigger conditions include the vehicle's battery voltage being less than a preset voltage and the number of power replenishment cycles in a single power-down cycle not exceeding a preset number.

[0011] When the CAN network is in a sleep state, the sleep time is obtained so that the sleep CAN network can be woken up when the sleep time meets the wake-up time.

[0012] When the vehicle meets the low-voltage power replenishment triggering conditions or the CAN network in a dormant state is woken up, a low-voltage power replenishment request is sent to replenish the vehicle's power.

[0013] Optionally, a low-voltage charging request is sent to charge the vehicle, including:

[0014] If the duration of sending a low-voltage power replenishment request exceeds a preset time threshold, determine whether the current power replenishment state is in progress.

[0015] If the device is in the process of charging, the first timing operation will begin, and the charging status will be continuously monitored during the execution of the first timing operation.

[0016] If the system is not currently in a power replenishment state, the low-voltage power replenishment request has failed to respond.

[0017] Based on the power replenishment status and the number of failed low-voltage power replenishment request responses, determine whether to terminate the low-voltage power replenishment process.

[0018] Optionally, during the execution of the first timing operation, the power replenishment status is continuously monitored, including:

[0019] Acquire the power replenishment status signal, and determine the signal of power replenishment in progress and the signal of power replenishment completion as the power replenishment success signal, and determine the signal of no power replenishment input and the signal of power replenishment error as the power replenishment failure signal;

[0020] The method also includes:

[0021] After the first timing operation ends, the number of failed power replenishment and / or the number of successful power replenishment are determined based on the power replenishment success signal, the power replenishment failure signal, and the signal that the power replenishment is not in progress.

[0022] The low-voltage power replenishment process ends when the number of power replenishment failures exceeds the preset power replenishment failure threshold.

[0023] If the number of power replenishment failures does not exceed the preset power replenishment failure threshold, a new low-voltage power replenishment request is sent to start a new round of power replenishment.

[0024] Optionally, the method further includes:

[0025] During a single power-down period, the CAN network is put into sleep mode each time a successful power-up is achieved.

[0026] The system continuously monitors whether the CAN network is in a sleep state. If the CAN network is in a sleep state and the sleep time meets the wake-up time, the sleep CAN network is woken up and the next round of low-voltage power replenishment process is restarted.

[0027] Optionally, the method further includes:

[0028] During a single power-down period, the power-up failure signal is cleared each time a power-up is successfully completed.

[0029] Optionally, the method further includes:

[0030] After the vehicle is powered on, clear the power-on success signal and the power-on failure signal.

[0031] Optionally, before determining whether the vehicle meets the low-voltage power replenishment triggering conditions, the method further includes:

[0032] After obtaining the vehicle's battery voltage, the battery voltage is filtered.

[0033] Based on the filtered voltage, the average voltage over a continuous preset time period is obtained;

[0034] The method also includes:

[0035] When the average voltage is less than the preset voltage, the battery voltage is determined to be less than the preset voltage.

[0036] Secondly, a low-voltage battery charging device for vehicles is also proposed, comprising:

[0037] The detection module is used to detect whether the vehicle's CAN network is in a sleep state after the vehicle is powered off.

[0038] The judgment module is used to determine whether the vehicle meets the low-voltage power replenishment trigger conditions when the CAN network is not in a sleep state. The low-voltage power replenishment trigger conditions include the vehicle's battery voltage being less than a preset voltage and the number of power replenishment cycles in a single power-down cycle not exceeding a preset number.

[0039] The acquisition module is used to acquire the sleep time when the CAN network is in a sleep state, so as to wake up the sleep CAN network when the sleep time meets the wake-up time.

[0040] The power replenishment module is used to send a low-voltage power replenishment request to replenish the vehicle's power when the vehicle meets the low-voltage power replenishment triggering conditions or when the CAN network in a dormant state is woken up.

[0041] Thirdly, an electronic device is also proposed, including a processor and a memory, wherein the memory stores computer program instructions, which are executed by the processor to perform the vehicle low-voltage battery charging method described above.

[0042] Fourthly, a storage medium is also proposed, on which program instructions are stored. When the program instructions are run, they are used to execute the vehicle low-voltage battery charging method described above.

[0043] According to the above technical solution, after the vehicle is powered off, it is detected whether the vehicle's CAN network is in a dormant state. If the CAN network is not in a dormant state, it is determined whether the vehicle meets the low-voltage power replenishment triggering conditions. These conditions include the vehicle's battery voltage being lower than a preset voltage and the number of power replenishment cycles during a single power-off not exceeding a preset number. If the CAN network is in a dormant state, the dormant time is acquired to wake up the dormant CAN network when the dormant time meets the wake-up time. When the vehicle meets the low-voltage power replenishment triggering conditions or the dormant CAN network is woken up, a low-voltage power replenishment request is sent to replenish the vehicle's power. Therefore, based on voltage and time methods, without user intervention, the vehicle's battery charge can be automatically detected and determined by the onboard T-BOX to trigger low-voltage power replenishment. This effectively solves the problem of battery depletion after long-term vehicle parking, reduces the risk of users being unable to use the vehicle, and improves the user experience.

[0044] The method for charging a low-voltage battery in a vehicle according to the present invention, and other advantages, objectives and features of the present invention will be apparent in part from the following description, and in part from the understanding of those skilled in the art through study and practice of the present invention. Attached Figure Description

[0045] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0046] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0047] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of exemplary embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0048] Figure 1 A schematic flowchart of a method for replenishing a vehicle's low-voltage battery according to an embodiment of the present invention is shown;

[0049] Figure 2 A schematic flowchart illustrating the charging of a vehicle low-voltage battery according to another embodiment of the present invention is shown; and

[0050] Figure 3 A schematic block diagram of a vehicle low-voltage battery charging device according to an embodiment of the present invention is shown; and

[0051] Figure 4 A schematic block diagram of an electronic device according to an embodiment of the present invention is shown. Detailed Implementation

[0052] To better understand the above-mentioned objectives, features, and advantages of this application, the solution of this application will be further described below. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0053] The terms "first," "second," "third," "fourth," etc. (if present) in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus. The technical solutions of the embodiments of this application will now be clearly and completely described in conjunction with the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them.

[0054] Many specific details are set forth in the following description in order to provide a full understanding of this application, but this application may also be implemented in other ways different from those described herein; obviously, the embodiments in the specification are only some embodiments of this application, and not all embodiments.

[0055] To address the aforementioned technical problems, a method for replenishing low-voltage batteries in vehicles is proposed according to the first aspect of this application. Figure 1 A schematic flowchart of a vehicle low-voltage battery charging method 100 according to an embodiment of the present invention is shown. Figure 1 As shown, method 100 may include the following steps:

[0056] Step S110: After the vehicle is powered off, check whether the vehicle's CAN network is in a sleep state.

[0057] Figure 2 A schematic flowchart illustrating the charging of a vehicle low-voltage battery according to another embodiment of the present invention is shown, such as... Figure 2 As shown, switching the vehicle from ON to OFF indicates that the vehicle is powered off. At this time, the vehicle communication box (T-BOX) prepares to enter CAN sleep mode. Preferably, a timer is started at this time. When the timer reaches the set time, such as 20 minutes, the T-BOX starts to determine whether the CAN network has entered sleep mode.

[0058] Step S120: When the CAN network is not in a dormant state, determine whether the vehicle meets the low-voltage power replenishment trigger conditions. The low-voltage power replenishment trigger conditions include that the vehicle's battery voltage is less than a preset voltage and the number of power replenishment cycles in a single power-down cycle does not exceed a preset number.

[0059] If the CAN network is not in sleep mode, it checks whether the vehicle's battery voltage is lower than a preset voltage, such as 12.6V, and whether the number of times a single power-down cycle can be replenished does not exceed a preset number, such as 7 times.

[0060] Step S130: When the CAN network is in a sleep state, obtain the sleep time so as to wake up the sleep CAN network when the sleep time meets the wake-up time.

[0061] If the CAN network is in sleep mode, the sleep time is obtained. Specifically, the T-BOX determines whether the vehicle has been in sleep mode for 5 consecutive days. If it has been in sleep mode for 5 consecutive days, the sleep time is considered to meet the wake-up time. In this case, the T-BOX wakes up the sleep CAN network. Note that 5 days is merely an example and does not imply a limitation on the wake-up time. In practical applications, the wake-up time can be rationally set according to specific needs. If the vehicle has not been in sleep mode for 5 consecutive days, the T-BOX determines whether the CAN network has been woken up during this period. If it has been woken up, the timer operation is returned to the above steps. Specifically, the timer is reset to zero, and a new timer operation is started. If the vehicle has not been woken up, the determination of whether the vehicle has been in sleep mode for 5 consecutive days is repeated.

[0062] Step S140: When the vehicle meets the low-voltage power replenishment triggering conditions or the CAN network in a dormant state is woken up, a low-voltage power replenishment request is sent to replenish the vehicle's power.

[0063] If the vehicle meets the low-voltage power replenishment triggering conditions after the above low-voltage power replenishment triggering conditions are determined, or if the CAN network in a dormant state is awakened, the T-BOX sends a low-voltage power replenishment request CAN signal. At this time, the new energy power domain controller (PDCU) controls the OFF high voltage on the vehicle to replenish the vehicle's battery.

[0064] According to the above technical solution, after the vehicle is powered off, it is detected whether the vehicle's CAN network is in a dormant state. If the CAN network is not in a dormant state, it is determined whether the vehicle meets the low-voltage power replenishment triggering conditions. These conditions include the vehicle's battery voltage being lower than a preset voltage and the number of power replenishment cycles during a single power-off not exceeding a preset number. If the CAN network is in a dormant state, the dormant time is acquired to wake up the dormant CAN network when the dormant time meets the wake-up time. When the vehicle meets the low-voltage power replenishment triggering conditions or the dormant CAN network is woken up, a low-voltage power replenishment request is sent to replenish the vehicle's power. Therefore, based on voltage and time methods, without user intervention, the vehicle's battery charge can be automatically detected and determined by the onboard T-BOX to trigger low-voltage power replenishment. This effectively solves the problem of battery depletion after long-term vehicle parking, reduces the risk of users being unable to use the vehicle, and improves the user experience.

[0065] Optionally, step S140, sending a low-voltage charging request to charge the vehicle, may include:

[0066] Step S141: When the duration of sending the low-voltage power replenishment request exceeds a preset time threshold, determine whether the current state is in the power replenishment state.

[0067] For example, a low-voltage charging request can be continuously sent. When the duration of the low-voltage charging request exceeds a preset time threshold, such as 12 seconds, it can be determined whether the PDCU is in the charging state. Specifically, the T-BOX can be used to determine whether the PDCU's charging state has switched to the charging state "1:12V charging".

[0068] Step S142: If the device is in the power replenishment state, start the first timing operation and continuously monitor the power replenishment state during the execution of the first timing operation.

[0069] If the device has been switched to "1:12V charging", the T-BOX will start the first timing operation. Specifically, the timing operation can be preset to 60 minutes, and the timing mode is countdown. During the 60-minute countdown, the T-BOX will continuously judge the CAN signal value of the PDCU's 12V charging status to achieve continuous monitoring of the charging status.

[0070] Step S143: If the system is not in a power replenishment state, determine that the low-voltage power replenishment request response has failed.

[0071] If you are not switched to "1:12V charging", it can be determined that you are not currently in the charging state. At this time, the "low voltage charging failure counter" of T-BOX will increment by 1, indicating that the low voltage charging request response has failed.

[0072] Step S144: Based on the power replenishment status and the number of failed low-voltage power replenishment request responses, determine whether to end the low-voltage power replenishment process.

[0073] As mentioned above, the current state of power replenishment can be determined by whether the CAN signal "12V charging" is equal to 1. At the same time, the number of low-voltage power replenishment request response failures can also be determined. For example, when the number of low-voltage power replenishment request response failures exceeds a preset number, such as 3 times, the low-voltage power replenishment process can be terminated. Otherwise, the process can return to the CAN network wake-up step and restart a new round of low-voltage power replenishment operation.

[0074] Optionally, during the execution of the first timing operation, the power replenishment status is continuously monitored, including:

[0075] Acquire the power replenishment status signal, and determine the signal of power replenishment in progress and power replenishment completed as power replenishment success signal, and determine the signal of no power replenishment input and power replenishment error as power replenishment failure signal.

[0076] For example, when the CAN value = "0: no 12V charging", it can be determined that there is currently no charging power input. When the CAN value = "3: 12V charging error", it can be determined that there is currently a charging error. Both of these status signals are charging failure signals, and the T-BOX's "low-voltage charging failure counter" increments by 1. When the CAN value = "2: 12V charging finish", it can be determined that the charging is complete. When the CAN value = "1: 12V charging", it can be determined that the charging is in progress. Both of these status signals are charging success signals, and the T-BOX's "low-voltage charging success counter" increments by 1.

[0077] The low-voltage power replenishment process can be terminated if the number of power replenishment failures exceeds a preset threshold, such as three times. If the number of power replenishment failures does not exceed the preset threshold, a new low-voltage power replenishment request is sent to begin a new round of power replenishment. Specifically, the process can return to the CAN network wake-up step to restart a new round of low-voltage power replenishment.

[0078] Optionally, the method may also include controlling the CAN network to hibernate each time a successful power-up occurs during a single power-down.

[0079] For example, upon each successful low-voltage power replenishment, the T-BOX can set the low-voltage power replenishment request to 0, stop sending messages, and control the CAN network to enter a sleep state. After waiting for, for example, 10 minutes after entering sleep mode, the CAN network can be woken up again.

[0080] Optionally, after the T-BOX is about to enter sleep mode, it continuously monitors whether the CAN network is in sleep mode. As mentioned above, if the CAN network is in sleep mode and has been in sleep mode for 5 days, it will wake up the sleep CAN network and then send a new low-voltage power replenishment request to restart the next round of low-voltage power replenishment process.

[0081] Optionally, the method may further include: clearing the power failure signal each time a power-up success is achieved during a single power-down period.

[0082] For example, after each successful low-voltage power replenishment, the T-BOX can reset the low-voltage power replenishment failure counter to clear the power replenishment failure signal.

[0083] This can prevent the low-voltage charging process from ending prematurely when the number of charging failures reaches a preset failure threshold, even if the low-voltage charging is successful, thus affecting the battery's charging capacity and subsequent normal vehicle use.

[0084] Optionally, the method may also include: clearing the power-on success signal and the power-on failure signal after the vehicle is powered on.

[0085] For example, after each power-on of the vehicle, both the low-voltage power-up success counter and the low-voltage power-up failure counter can be cleared to eliminate the power-up failure signal and the power-up success signal. This prevents the power-up failure or error from being caused by the power-up success signal and the power-up failure signal from the previous low-voltage power-up process during the current low-voltage power-up process after the vehicle is powered off again.

[0086] Optionally, before determining whether the vehicle meets the low-voltage power replenishment triggering conditions, the method may further include:

[0087] After obtaining the vehicle's battery voltage, the battery voltage is filtered.

[0088] Battery voltage can be filtered using any existing or future filtering operation to remove invalid or interfering components.

[0089] Based on the filtered voltage, the average voltage over a continuous preset time period is obtained.

[0090] After filtering the battery voltage, the average voltage over a continuous preset time period, such as 10 seconds, is obtained. If the average voltage over 10 seconds is lower than the preset voltage, it is determined that the battery voltage at that time is lower than the preset voltage.

[0091] Therefore, a more accurate battery voltage can be obtained. Utilizing the average voltage over a continuous preset time period can prevent the low-voltage charging process from being affected by external interference or detection errors, thus reducing the randomness of voltage acquisition errors and improving the reliability of low-voltage charging.

[0092] According to a second aspect of the invention, a low-voltage battery charging device for vehicles is also provided. Figure 3 A schematic block diagram of a vehicle low-voltage battery charging device 300 according to an embodiment of the present invention is shown. Figure 3 As shown, the device 300 may include: a detection module 310, a judgment module 320, an acquisition module 330, and a power replenishment module 340.

[0093] The detection module 310 is used to detect whether the vehicle's CAN network is in a sleep state after the vehicle is powered off.

[0094] The judgment module 320 is used to determine whether the vehicle meets the low-voltage power replenishment trigger conditions when the CAN network is not in a sleep state. The low-voltage power replenishment trigger conditions include the vehicle's battery voltage being less than a preset voltage and the number of power replenishment cycles in a single power-down cycle not exceeding a preset number.

[0095] The acquisition module 330 is used to acquire the sleep time when the CAN network is in a sleep state, so as to wake up the sleep CAN network when the sleep time meets the wake-up time.

[0096] The power replenishment module 340 is used to send a low-voltage power replenishment request to replenish the vehicle when the vehicle meets the low-voltage power replenishment triggering conditions or when the CAN network in a dormant state is woken up.

[0097] According to a third aspect of the present invention, an electronic device is also provided. Figure 4 A schematic block diagram of an electronic device 400 according to an embodiment of the present invention is shown. Figure 4As shown, the electronic device 400 may include a processor 410 and a memory 420. The memory 420 stores computer program instructions, which, when executed by the processor 410, are used to perform the vehicle low-voltage battery charging method described above.

[0098] According to a fourth aspect of the present invention, a storage medium is also provided, on which program instructions are stored, which, when executed, are used to perform the vehicle low-voltage battery charging method described above. The storage medium may, for example, include 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 may be any combination of one or more computer-readable storage media.

[0099] Those skilled in the art can understand the specific details and beneficial effects of the vehicle low-voltage battery charging device, electronic equipment, and storage medium by reading the above description of the relevant methods for charging vehicle low-voltage batteries, and will not be repeated here for the sake of brevity.

[0100] In the several embodiments provided in this 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 merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be through some interfaces; the indirect coupling or communication connection between apparatuses or units may be electrical, mechanical, or other forms.

[0101] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0102] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0103] If the integrated unit is implemented as a 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 solution of this application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods of the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0104] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit it. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions 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 this application.

Claims

1. A method for replenishing a vehicle's low-voltage battery, characterized in that, include: After the vehicle is powered off, it is detected whether the vehicle's CAN network is in a sleep state; When the CAN network is not in the sleep state, it is determined whether the vehicle meets the low-voltage power replenishment trigger condition, wherein the low-voltage power replenishment trigger condition includes the vehicle's battery voltage being less than a preset voltage and the number of power replenishment cycles in a single power-down cycle not exceeding a preset number; When the CAN network is in the sleep state, the sleep time is acquired so as to wake up the sleep CAN network when the sleep time meets the wake-up time. When the vehicle meets the low-voltage power replenishment triggering condition or the dormant CAN network is woken up, a low-voltage power replenishment request is sent to replenish the vehicle's power. Sending a low-voltage power replenishment request to replenish the vehicle includes: determining whether the vehicle is currently in a power replenishment state when the duration of sending the low-voltage power replenishment request exceeds a preset time threshold; if the vehicle is in a power replenishment state, starting a first timing operation and acquiring a power replenishment status signal, identifying the power replenishment status signal and the power replenishment completion status signal as power replenishment success signals, and identifying the no power supply input status signal and the power replenishment error signal as power replenishment failure signals; if the vehicle is not in a power replenishment state, determining that the low-voltage power replenishment request response has failed; and determining whether to terminate the low-voltage power replenishment process based on the power replenishment status and the number of low-voltage power replenishment request response failures. After the first timing operation ends, the number of power replenishment failures and / or the number of power replenishment successes are determined based on the power replenishment success signal, the power replenishment failure signal, and the signal that the power replenishment is not in progress. When the number of power replenishment failures exceeds a preset power replenishment failure threshold, the low-voltage power replenishment process is terminated. When the number of power replenishment failures does not exceed the preset power replenishment failure threshold, a new low-voltage power replenishment request is sent to start a new round of power replenishment; During a single power-down period, the CAN network is controlled to go into sleep mode each time the number of successful power-up events increases; The system continuously monitors whether the CAN network is in the sleep state, and wakes up the sleep CAN network when the sleep time meets the wake-up time, and then restarts the next round of low-voltage power replenishment process.

2. The method for replenishing a vehicle's low-voltage battery as described in claim 1, characterized in that, The method further includes: During a single power-down period, the power-up failure signal is cleared each time the number of successful power-up attempts increases.

3. The method for replenishing a vehicle's low-voltage battery as described in claim 1, characterized in that, The method further includes: After the vehicle is powered on, the power-on success signal and the power-on failure signal are cleared.

4. The method for replenishing a vehicle's low-voltage battery as described in claim 1, characterized in that, Before determining whether the vehicle meets the low-voltage power replenishment triggering condition, the method further includes: After obtaining the battery voltage of the vehicle, the battery voltage is filtered. Based on the filtered voltage, the average voltage over a continuous preset time period is obtained; The method further includes: When the average voltage is less than the preset voltage, it is determined that the battery voltage is less than the preset voltage.

5. A low-voltage battery charging device for vehicles, characterized in that, include: The detection module is used to detect whether the vehicle's CAN network is in a sleep state after the vehicle is powered off. The judgment module is used to determine whether the vehicle meets the low-voltage power replenishment triggering conditions when the CAN network is not in the sleep state. The low-voltage power replenishment triggering conditions include the vehicle's battery voltage being less than a preset voltage and the number of power replenishment cycles in a single power-down cycle not exceeding a preset number. The acquisition module is used to acquire the sleep time when the CAN network is in the sleep state, so as to wake up the sleep CAN network when the sleep time meets the wake-up time. The power replenishment module is used to send a low-voltage power replenishment request to replenish the vehicle when the vehicle meets the low-voltage power replenishment triggering condition or when the CAN network in the dormant state is woken up. The power replenishment module is further configured to determine whether it is currently in a power replenishment state when the duration of sending the low-voltage power replenishment request exceeds a preset time threshold; if it is in the power replenishment state, it starts executing a first timing operation and acquires a power replenishment status signal, so as to determine the signal of the power replenishment state and the signal of the power replenishment completion state as a power replenishment success signal, and the signal of no power replenishment power input state and the signal of power replenishment error as a power replenishment failure signal; if it is not in the power replenishment state, it determines that the low-voltage power replenishment request response has failed; based on the power replenishment status and the number of low-voltage power replenishment request response failures, it determines whether to end the low-voltage power replenishment process; after the first timing operation ends, based on the power replenishment success... The system uses a power signal, a power-up failure signal, and a signal indicating that it is not in a power-up state to determine the number of power-up failures and / or the number of power-up successes. When the number of power-up failures exceeds a preset power-up failure threshold, the low-voltage power-up process ends. When the number of power-up failures does not exceed the preset power-up failure threshold, a new low-voltage power-up request is sent to start a new round of power-up. During a single power-down period, the CAN network is controlled to go into sleep mode each time the number of successful power-up increases. The system continuously monitors whether the CAN network is in sleep mode, and wakes up the sleep CAN network when the sleep time meets the wake-up time requirement to restart the next round of low-voltage power-up.

6. An electronic device, characterized in that, It includes a processor and a memory, wherein the memory stores computer program instructions, which, when executed by the processor, are used to perform the vehicle low-voltage battery charging method as described in any one of claims 1 to 4.

7. A storage medium storing program instructions that, when executed, perform the vehicle low-voltage battery charging method as described in any one of claims 1 to 4.

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