Methods, apparatus and storage media for battery charging

Abstract

This application discloses a method, apparatus, and storage medium for battery charging, belonging to the field of vehicle control technology. The method includes: in response to the vehicle's high-voltage power-on state, acquiring a first detection result, the first detection result indicating whether the vehicle's low-voltage lithium battery is in a charging state; in response to the first detection result indicating that the vehicle's low-voltage lithium battery is in a charging state, monitoring the state of charge (SOC) of the low-voltage lithium battery, the SOC indicating the remaining percentage of charge in the low-voltage lithium battery; and controlling the charging voltage of the low-voltage lithium battery based on the SOC. This provides a direct understanding of the charging process of the low-voltage lithium battery, and by controlling the charging voltage according to the SOC, it enables corresponding charge and discharge control of the lithium battery at different charging stages, preventing the lithium battery from remaining in a saturated state for extended periods, thereby ensuring the safety of lithium battery use and extending its lifespan.

Description

Technical Field

[0001] This application relates to the field of vehicle control technology, and in particular to a method, apparatus and storage medium for battery charging. Background Technology

[0002] Low-voltage lithium batteries are the preferred low-voltage power source for vehicles, and their safety and long lifespan must be guaranteed. If a lithium battery is kept in a fully charged state for an extended period, i.e., continuing to charge after it has been fully charged, it can damage the internal hardware, leading to battery malfunctions, reduced lifespan, and compromised vehicle safety. Therefore, controlling the lithium battery charging process to prevent it from remaining in a fully charged state for extended periods is crucial for ensuring battery safety and extending its lifespan. Summary of the Invention

[0003] This application provides a method, apparatus, and storage medium for charging a battery, which can be used to prevent lithium batteries from being in a fully charged state for extended periods, ensuring the safety of lithium battery use and extending the lifespan of the lithium battery. The technical solution is as follows:

[0004] On one hand, embodiments of this application provide a method for charging a battery, the method comprising:

[0005] In response to the high-voltage power-on state of the vehicle, a first detection result is obtained, which is used to indicate whether the low-voltage lithium battery of the vehicle is in a charging state.

[0006] In response to the first detection result indicating that the low-voltage lithium battery of the vehicle is in the charging state, the state of charge of the low-voltage lithium battery is monitored, the state of charge indicating the remaining percentage of the low-voltage lithium battery;

[0007] The charging voltage of the low-voltage lithium battery is controlled based on its state of charge.

[0008] On the other hand, a battery charging device is provided, the device comprising:

[0009] The acquisition module is used to acquire a first detection result in response to the high voltage power-on state of the vehicle. The first detection result is used to indicate whether the low voltage lithium battery of the vehicle is in a charging state.

[0010] A monitoring module is configured to monitor the state of charge of the low-voltage lithium battery in response to the first detection result indicating that the low-voltage lithium battery of the vehicle is in the charging state, the state of charge indicating the remaining percentage of the low-voltage lithium battery;

[0011] A control module is used to control the charging voltage of the low-voltage lithium battery based on the state of charge of the low-voltage lithium battery.

[0012] On the other hand, a non-transitory computer-readable storage medium is also provided, wherein at least one computer program is stored in the computer-readable storage medium, the at least one computer program being loaded and executed by a processor to enable a computer to implement any of the battery charging methods described above.

[0013] On the other hand, a computer program product is also provided, the computer program product including computer instructions, which, when executed by a processor, implement the steps of any of the battery charging methods described above.

[0014] The technical solution provided in this application brings at least the following beneficial effects:

[0015] This application monitors the state of charge (SOC) of the low-voltage lithium battery when the vehicle is under high-voltage power and the low-voltage lithium battery is charging, obtaining the remaining percentage of charge to intuitively understand the charging progress. Then, based on the SOC, the charging voltage of the low-voltage lithium battery is controlled, enabling corresponding charge and discharge control at different charging stages. This prevents the lithium battery from remaining in a saturated state for extended periods, ensuring battery safety and extending its lifespan. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of an implementation environment provided in an embodiment of this application;

[0018] Figure 2 This is a flowchart of a battery charging method provided in an embodiment of this application;

[0019] Figure 3 This is a logic diagram of battery charging provided in an embodiment of this application;

[0020] Figure 4 This is a schematic diagram of the structure of a battery charging device provided in an embodiment of this application. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0022] This application provides a method for charging a battery. Please refer to [link / reference]. Figure 1 The diagram illustrates the implementation environment of the method provided in this application embodiment. This implementation environment may include: a low-voltage lithium battery 11, an LBMS (Low-voltage Battery Management System) 12, a ZCU (Zone Control Unit) 13, a VCU (Vehicle Control Unit) 14, a DCDC (Direct Current to Direct Current Converter) 15, an OBC (On-board Charger) 16, and an ECU (Electronic Control Unit) 17.

[0023] Optionally, VCU14 obtains the vehicle's power-on status from the vehicle's OBC16. In response to the vehicle's high-voltage power-on status, VCU14 obtains a first detection result, which is used to indicate whether the vehicle's low-voltage lithium battery 11 is in a charging state.

[0024] In one possible implementation, in response to a first detection result indicating that the vehicle's low-voltage lithium battery 11 is in a charging state, the VCU 14 monitors the SOC of the low-voltage lithium battery 11 via the ZCU 13. The ZCU 13 collects the SOC of the low-voltage lithium battery 11 from the LBMS 12 at a preset frequency. The VCU 14 controls the charging voltage of the low-voltage lithium battery 11 based on its SOC. The low-voltage lithium battery 11, LBMS 12, ZCU 13, VCU 14, DC-DC converter 15, OBC 16, and ECU 17 establish a communication connection via a wired or wireless network.

[0025] Based on the above Figure 1 The implementation environment shown in this application embodiment provides a battery charging method, such as... Figure 2 As shown, taking the application of this method to VCU as an example, the method includes steps 201-203.

[0026] In step 201, in response to the high-voltage power-on state of the vehicle, the VCU acquires a first detection result, which is used to indicate whether the low-voltage lithium battery of the vehicle is in a charging state.

[0027] For example, the VCU can obtain the vehicle's high-voltage power-on state from the vehicle's OBC, which includes high-voltage power-on and high-voltage power-off states. In response to the high-voltage power-on state, the VCU obtains a first detection result, which indicates whether the vehicle's low-voltage lithium battery is in a charging state. In one possible implementation, obtaining the first detection result includes the VCU obtaining the charging state of the vehicle's low-voltage lithium battery from the vehicle's ECU via a bus. For example, if the vehicle is in a high-voltage power-off state, it is necessary to first control the vehicle's high-voltage power-on state to wake up the various components of the vehicle in order to detect the charging state of the vehicle's low-voltage lithium battery.

[0028] In one possible implementation, in response to the vehicle's low-voltage lithium battery being in a charging state, a first detection result indicates that the vehicle's low-voltage lithium battery is in a charging state; in response to the vehicle's low-voltage lithium battery not being in a charging state, the first detection result indicates that the vehicle's low-voltage lithium battery is not in a charging state. Optionally, the VCU can obtain the charging state of the low-voltage lithium battery from the ECU via a CAN (Controller Area Network) bus.

[0029] In step 202, in response to the first detection result indicating that the vehicle's low-voltage lithium battery is in a charging state, the VCU monitors the state of charge of the low-voltage lithium battery, which indicates the remaining percentage of charge in the low-voltage lithium battery.

[0030] Optionally, if the first detection result indicates that the low-voltage lithium battery of the vehicle is in a state of charging, the VCU monitors the state of charge of the low-voltage lithium battery, wherein the state of charge indicates the remaining percentage of the low-voltage lithium battery, i.e., the battery's SOC (State of Charge).

[0031] In one possible implementation, the VCU monitors the state of charge (SOC) of the low-voltage lithium battery, including: the VCU monitors the SOC of the low-voltage lithium battery via the ZCU. Exemplarily, the LBMS acquires the SOC of the low-voltage lithium battery, and the ZCU obtains the SOC of the low-voltage lithium battery from the LBMS via a CAN bus at a preset frequency. Optionally, the preset frequency can be set based on experience or experimentation.

[0032] By monitoring the state of charge (SOC) of the low-voltage lithium battery, we can understand the charging process of the low-voltage lithium battery, which makes it easier to control the charging voltage of the low-voltage lithium battery according to its SOC. This allows us to control the charging and discharging of the lithium battery at different stages of the charging process.

[0033] In step 203, the VCU controls the charging voltage of the low-voltage lithium battery based on the state of charge of the low-voltage lithium battery.

[0034] For example, after obtaining the state of charge of the low-voltage lithium battery, the VCU controls the charging voltage of the low-voltage lithium battery based on the state of charge of the low-voltage lithium battery, including: in response to the remaining charge percentage of the low-voltage lithium battery being 100%, the low-voltage lithium battery is discharged when connected to a DC-DC converter, wherein the voltage of the DC-DC converter connected to the low-voltage lithium battery is maintained at a first preset voltage.

[0035] In one possible implementation, when the ZCU monitors that the SOC of the low-voltage lithium battery is 100%, and the DC-DC converter is connected, the VCU controls the low-voltage lithium battery to discharge via the LBMS, so that the voltage of the DC-DC converter connected to the low-voltage lithium battery is maintained at a first preset voltage. This includes: setting the target discharge voltage of the DC-DC converter to the first preset voltage via the LBMS; and when the DC-DC converter receives the instruction from the LBMS to set the target discharge voltage of the DC-DC converter to the first preset voltage, the DC-DC converter compares the voltage of the low-voltage lithium battery at this time with the first preset voltage.

[0036] Optionally, if the voltage of the low-voltage lithium battery is higher than the first preset voltage, the DC-DC converter controls the low-voltage lithium battery to discharge to the vehicle's load, so that the voltage of the low-voltage lithium battery is maintained at the first preset voltage; if the voltage of the low-voltage lithium battery is lower than the first preset voltage, the DC-DC converter charges the low-voltage lithium battery, so that the voltage of the low-voltage lithium battery is maintained at the first preset voltage. For example, the first preset voltage can be set empirically, for example, it can be set to 13.8 volts.

[0037] In one possible implementation, if the DCDC controls the low-voltage lithium battery to discharge to the vehicle's load, and the SOC of the low-voltage lithium battery does not decrease because the vehicle's load has no power demand, the DCDC is controlled to stop charging the low-voltage lithium battery until the SOC of the low-voltage lithium battery is less than the difference between a preset target percentage and a hysteresis width percentage, then the DCDC is controlled to charge the low-voltage lithium battery again, wherein the voltage of the DCDC connected to the low-voltage lithium battery is maintained at a second preset voltage.

[0038] For example, during the discharge process of the low-voltage lithium battery, in response to the difference between the remaining charge percentage of the low-voltage lithium battery and the hysteresis width percentage being less than a preset target percentage, the low-voltage lithium battery is controlled to stop discharging; the low-voltage lithium battery is charged by a DC-DC converter, wherein the voltage of the DC-DC converter connected to the low-voltage lithium battery is maintained at a second preset voltage, which is greater than a first preset voltage.

[0039] In one possible implementation, the preset target percentage and hysteresis width percentage can be set based on experience or experimentation. For example, the preset target percentage can be set to 92% and the hysteresis width percentage can be set to 2%. Therefore, the difference between the preset target percentage and the hysteresis width percentage is 90%.

[0040] By setting a hysteresis width, the charging voltage and charging / discharging state are prevented from changing even with small fluctuations in the remaining charge percentage of the low-voltage lithium battery, thus ensuring the normal charging of the low-voltage lithium battery.

[0041] Optionally, if the remaining charge percentage of the low-voltage lithium battery is less than 90%, the discharge operation of the DC-DC converter on the low-voltage lithium battery is stopped. Furthermore, the LBMS performs closed-loop voltage control on the DC-DC converter's discharge voltage, setting the target discharge voltage of the DC-DC converter to a second preset voltage.

[0042] In one possible implementation, when the DC-DC converter receives an instruction from the LBMS to set the target discharge voltage of the DC-DC converter to a second preset voltage, the DC-DC converter charges the low-voltage lithium battery, and the voltage between the DC-DC converter and the low-voltage lithium battery is maintained at the second preset voltage, thereby maintaining the voltage of the low-voltage lithium battery at the second preset voltage. Optionally, the second preset voltage can be set empirically, and it is necessary to ensure that the second preset voltage is greater than the first preset voltage.

[0043] For example, during the charging process of a low-voltage lithium battery, in response to the remaining capacity percentage of the low-voltage lithium battery being greater than or equal to the difference between a preset target percentage and a hysteresis width percentage, and less than 100%, the low-voltage lithium battery is charged via a DC-DC converter, wherein the voltage of the DC-DC converter connected to the low-voltage lithium battery is less than or equal to a first preset voltage. In one possible implementation, when the preset target percentage is set to 92% and the hysteresis width percentage is set to 2%, the difference between the preset target percentage and the hysteresis width percentage is 90%, and the sum of the preset target percentage and the hysteresis width percentage is 94%.

[0044] Optionally, when the remaining charge percentage of the low-voltage lithium battery increases to greater than or equal to 90% and less than 100%, the low-voltage lithium battery is charged via DC-DC converter, including: in response to the remaining charge percentage of the low-voltage lithium battery being greater than or equal to the difference between a preset target percentage and a hysteresis width percentage and less than the sum of a preset target percentage and a hysteresis width percentage, i.e., the SOC of the low-voltage lithium battery being greater than 90% and less than 94%, the low-voltage lithium battery is charged via DC-DC converter, wherein the voltage of the DC-DC converter connected to the low-voltage lithium battery is maintained at a third preset voltage, the third preset voltage being less than or equal to a first preset voltage.

[0045] In one possible implementation, in response to the low-voltage lithium battery having a remaining charge percentage greater than or equal to a preset target percentage plus a hysteresis width percentage and less than 100%, i.e., the low-voltage lithium battery having a SOC greater than 94% and less than 100%, the low-voltage lithium battery is charged via a DC-DC converter, wherein the voltage of the DC-DC converter connected to the low-voltage lithium battery is maintained at a fourth preset voltage, which is less than a third preset voltage.

[0046] Optionally, when the VCU monitors the remaining charge percentage of the low-voltage lithium battery from the LBMS via the ZCU, it sets the target discharge voltage of the DC-DC converter to a third preset voltage via the LBMS.

[0047] For example, when the DC-DC converter receives an instruction from the LBMS to set the target discharge voltage of the DC-DC converter to a third preset voltage, the DC-DC converter charges the low-voltage lithium battery, and the voltage of the DC-DC converter connected to the low-voltage lithium battery is maintained at the third preset voltage, thereby maintaining the voltage of the low-voltage lithium battery at the third preset voltage. Optionally, the third preset voltage can be set empirically, and it needs to satisfy that the third preset voltage is less than or equal to the first preset voltage.

[0048] In one possible implementation, when the VCU monitors the remaining charge percentage of the low-voltage lithium battery from the LBMS via the ZCU, it is greater than or equal to 94% and less than 100%, and the target discharge voltage of the DC-DC converter is set to a fourth preset voltage via the LBMS.

[0049] Optionally, when the DC-DC receives an instruction from the LBMS to set the target discharge voltage of the DC-DC to a fourth preset voltage, the DC-DC charges the low-voltage lithium battery, and the voltage connected to the low-voltage lithium battery by the DC-DC is maintained at the fourth preset voltage, thereby maintaining the voltage of the low-voltage lithium battery at the fourth preset voltage. Optionally, the fourth preset voltage can be set empirically, and it needs to satisfy that the fourth preset voltage is less than the third preset voltage.

[0050] When the remaining charge percentage of the low-voltage lithium battery is greater than or equal to 90% and less than 94%, the low-voltage lithium battery is charged via a DC-DC converter, maintaining the voltage connected to the DC-DC converter at a third preset voltage. When the remaining charge percentage of the low-voltage lithium battery is greater than or equal to 94% and less than 100%, the low-voltage lithium battery is charged via a DC-DC converter, maintaining the voltage connected to the DC-DC converter at a fourth preset voltage. Because the fourth preset voltage is lower than the third preset voltage, the charging voltage is reduced as the remaining charge percentage of the low-voltage lithium battery increases, preventing the low-voltage lithium battery from reaching full charge too quickly, which could affect the safety and lifespan of the lithium battery.

[0051] This application embodiment monitors the state of charge (SOC) of the low-voltage lithium battery while it is charging, obtaining the remaining percentage of charge to intuitively understand the charging progress. The charging voltage of the low-voltage lithium battery is then controlled based on its SOC, enabling corresponding charge and discharge control at different stages of the charging process. This prevents the lithium battery from remaining in a saturated state for extended periods, ensuring battery safety and extending its lifespan.

[0052] Combining the above methods and processes, with Figure 3 The following is an example of a battery charging logic diagram provided in an embodiment of this application. The execution entity can be the VCU. Step 301: The vehicle is in a high-voltage power-on state, and the low-voltage lithium battery is in a charging state. Step 302: The LBMS collects the SOC of the low-voltage lithium battery. Step 303: The ZCU obtains the SOC of the low-voltage lithium battery from the LBMS. Step 304: Determine if the SOC is 100%. If the SOC is 100%, proceed to step 306; if the SOC is not 100%, proceed to step 305. Step 305: Determine if the SOC is ≥94%. Step 306: The voltage of the DC-DC converter is maintained at a first preset voltage.

[0053] After step 305, if SOC ≥ 94%, proceed to step 306; if SOC < 94%, proceed to step 307. Step 307: Determine if SOC ≥ 90%. If SOC ≥ 90%, proceed to step 306; if SOC < 90%, proceed to step 308. Step 308: The voltage of the DC-DC converter is maintained at a second preset voltage. The second preset voltage is greater than the first preset voltage.

[0054] See Figure 4 This application provides a battery charging device, which includes:

[0055] The acquisition module 401 is used to acquire a first detection result in response to the high voltage power-on state of the vehicle. The first detection result is used to indicate whether the low voltage lithium battery of the vehicle is in a charging state.

[0056] The monitoring module 402 is used to monitor the state of charge of the low-voltage lithium battery in response to a first detection result indicating that the low-voltage lithium battery of the vehicle is in a charging state, and the state of charge indicates the remaining percentage of the low-voltage lithium battery.

[0057] Control module 403 is used to control the charging voltage of low-voltage lithium battery based on the state of charge of low-voltage lithium battery.

[0058] In one possible implementation, the control module 403 is configured to discharge the low-voltage lithium battery in response to a remaining charge percentage of 100% when connected to a DC-DC converter, wherein the voltage of the DC-DC converter connected to the low-voltage lithium battery is maintained at a first preset voltage.

[0059] In one possible implementation, the control module 403 is further configured to control the low-voltage lithium battery to stop discharging in response to the difference between the remaining charge percentage of the low-voltage lithium battery and a preset target percentage minus the hysteresis width percentage; and to charge the low-voltage lithium battery via a DC-DC converter, wherein the voltage of the DC-DC converter connected to the low-voltage lithium battery is maintained at a second preset voltage, which is greater than a first preset voltage.

[0060] In one possible implementation, the control module 403 is further configured to charge the low-voltage lithium battery via a DC-DC converter in response to the difference between a preset target percentage and a hysteresis width percentage, which is greater than or equal to 100% and less than 100%, wherein the voltage of the DC-DC converter connected to the low-voltage lithium battery is less than or equal to a first preset voltage.

[0061] In one possible implementation, control module 403 is configured to charge the low-voltage lithium battery via a DC-DC converter in response to the condition that the remaining charge percentage of the low-voltage lithium battery is greater than or equal to the difference between a preset target percentage and a hysteresis width percentage, and is less than the sum of the preset target percentage and the hysteresis width percentage, wherein the voltage of the DC-DC converter connected to the low-voltage lithium battery is maintained at a third preset voltage, the third preset voltage being less than or equal to a first preset voltage; and to charge the low-voltage lithium battery via a DC-DC converter in response to the condition that the remaining charge percentage of the low-voltage lithium battery is greater than or equal to the sum of the preset target percentage and the hysteresis width percentage, and is less than 100%, wherein the voltage of the DC-DC converter connected to the low-voltage lithium battery is maintained at a fourth preset voltage, the fourth preset voltage being less than the third preset voltage.

[0062] This device monitors the state of charge (SOC) of a vehicle's low-voltage lithium battery while it is charging, obtaining the remaining percentage of charge to provide a clear understanding of the charging progress. Based on the SOC, it controls the charging voltage of the low-voltage lithium battery, enabling corresponding charge and discharge control at different stages of the charging process. This prevents the battery from remaining in a saturated state for extended periods, ensuring battery safety and extending its lifespan.

[0063] It should be noted that the apparatus provided in the above embodiments is only illustrated by the division of the above functional modules. In practical applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above. In addition, the apparatus and method embodiments provided in the above embodiments belong to the same concept, and their specific implementation process can be found in the method embodiments, which will not be repeated here.

[0064] In an exemplary embodiment, a computer-readable storage medium is also provided, which stores at least one computer program that is loaded and executed by a processor of a computer device to enable the computer to implement any of the above-described battery charging methods.

[0065] In one possible implementation, the aforementioned computer-readable storage medium may be a read-only memory (ROM), a random access memory (RAM), a compact disc read-only memory (CD-ROM), magnetic tape, floppy disk, and optical data storage device, etc.

[0066] In an exemplary embodiment, a computer program product or computer program is also provided, the computer program product or computer program including computer instructions stored in a computer-readable storage medium. A processor of a computer device reads the computer instructions from the computer-readable storage medium, and executes the computer instructions, causing the computer device to perform any of the above-described battery charging methods.

[0067] It should be noted that all information (including but not limited to user device information, user personal information, etc.), data (including but not limited to data used for analysis, stored data, displayed data, etc.), and signals involved in this application are authorized by the user or fully authorized by all parties, and the collection, use, and processing of related data must comply with the relevant laws, regulations, and standards of the relevant countries and regions. For example, the state of charge, state of charge, charging voltage, and discharging voltage of the low-voltage lithium battery involved in this application were obtained with full authorization.

[0068] It should be understood that "multiple" as used in this article refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. The character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0069] It should be noted that the terms "first," "second," etc. (if applicable) in the specification and claims 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 of this application described herein can be implemented in orders other than those illustrated or described herein. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0070] The above description is merely an exemplary embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the principles of this application should be included within the protection scope of this application.

Claims

1. A method for charging a battery, characterized in that, The method includes: In response to the high-voltage power-on state of the vehicle, a first detection result is obtained, which is used to indicate whether the low-voltage lithium battery of the vehicle is in a charging state. In response to the first detection result indicating that the low-voltage lithium battery of the vehicle is in the charging state, the state of charge of the low-voltage lithium battery is monitored, the state of charge indicating the remaining percentage of the low-voltage lithium battery; The charging voltage of the low-voltage lithium battery is controlled based on its state of charge. The method of controlling the charging voltage of the low-voltage lithium battery based on its state of charge includes: In response to the low-voltage lithium battery having a remaining charge percentage of 100%, the low-voltage lithium battery discharges when connected to a DC-DC converter, wherein the voltage of the DC-DC converter connected to the low-voltage lithium battery is maintained at a first preset voltage. After the low-voltage lithium battery is discharged, it also includes: In response to the fact that the remaining charge percentage of the low-voltage lithium battery is less than the difference between a preset target percentage and the hysteresis width percentage, the low-voltage lithium battery is controlled to stop discharging. The low-voltage lithium battery is charged by the DC-DC converter, wherein the voltage of the DC-DC converter connected to the low-voltage lithium battery is maintained at a second preset voltage, which is greater than the first preset voltage.

2. The method according to claim 1, characterized in that, After charging the low-voltage lithium battery via the DC-DC converter, the process further includes: In response to the condition that the remaining charge percentage of the low-voltage lithium battery is greater than or equal to the difference between the preset target percentage and the hysteresis width percentage and is less than 100%, the low-voltage lithium battery is charged via the DC-DC converter, wherein the voltage of the DC-DC converter connected to the low-voltage lithium battery is less than or equal to the first preset voltage.

3. The method according to claim 2, characterized in that, The charging of the low-voltage lithium battery via the DC-DC converter, wherein the voltage of the DC-DC converter connected to the low-voltage lithium battery is less than or equal to the first preset voltage, includes: In response to the fact that the remaining charge percentage of the low-voltage lithium battery is greater than or equal to the difference between the preset target percentage and the hysteresis width percentage and is less than the sum of the preset target percentage and the hysteresis width percentage, the low-voltage lithium battery is charged through the DC-DC converter, wherein the voltage of the DC-DC converter connected to the low-voltage lithium battery is maintained at a third preset voltage, the third preset voltage being less than or equal to the first preset voltage. In response to the fact that the remaining charge percentage of the low-voltage lithium battery is greater than or equal to the sum of the preset target percentage and the hysteresis width percentage and is less than 100%, the low-voltage lithium battery is charged by the DC-DC converter, wherein the voltage of the DC-DC converter connected to the low-voltage lithium battery is maintained at a fourth preset voltage, which is less than the third preset voltage.

4. A battery charging device, characterized in that, The device includes: The acquisition module is used to acquire a first detection result in response to the high voltage power-on state of the vehicle. The first detection result is used to indicate whether the low voltage lithium battery of the vehicle is in a charging state. A monitoring module is configured to monitor the state of charge of the low-voltage lithium battery in response to the first detection result indicating that the low-voltage lithium battery of the vehicle is in the charging state, the state of charge indicating the remaining percentage of the low-voltage lithium battery; The control module is used to control the charging voltage of the low-voltage lithium battery based on its state of charge. The control module is configured to control the low-voltage lithium battery to discharge when the remaining charge percentage of the low-voltage lithium battery is 100% and it is connected to a DC-DC converter, wherein the voltage of the DC-DC converter connected to the low-voltage lithium battery is maintained at a first preset voltage. The control module is further configured to control the low-voltage lithium battery to stop discharging in response to the difference between the remaining charge percentage of the low-voltage lithium battery and the hysteresis width percentage, which is less than a preset target percentage; and to charge the low-voltage lithium battery through the DC-DC converter, wherein the voltage of the DC-DC converter connected to the low-voltage lithium battery is maintained at a second preset voltage, which is greater than the first preset voltage.

5. A computer program product comprising computer instructions that, when executed by a processor, implement the steps of the battery charging method as described in any one of claims 1 to 3.

6. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores at least one computer program, which is loaded and executed by a processor to enable the computer to implement the battery charging method as described in any one of claims 1 to 3.

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