Low-voltage lithium battery power compensation method and device, electronic equipment and vehicle

Abstract

The application provides a low-voltage lithium battery power compensation method and device, electronic equipment and vehicle, and belongs to the technical field of new energy vehicles. The method comprises the following steps: requesting the vehicle high voltage to charge the low-voltage lithium battery when the SOC of the low-voltage lithium battery is greater than a first preset SOC threshold and less than or equal to a second preset SOC threshold; the first preset SOC threshold is greater than 0; requesting the vehicle high voltage to charge the low-voltage lithium battery when the duration of the voltage power compensation working condition of the low-voltage lithium battery meets a first preset time length; the voltage power compensation working condition comprises that the low-voltage lithium battery has a discharge current, the discharge current is less than or equal to a preset current threshold, and the minimum single cell voltage of the low-voltage lithium battery is less than or equal to the compensation voltage corresponding to the discharge current in the preset compensation voltage MAP. The application can solve the technical problem that the low-voltage lithium battery of the new energy vehicle has a lag in triggering the power compensation action.

Description

Technical Field

[0001] This invention relates to the field of new energy vehicle technology, specifically to a low-voltage lithium battery charging method, device, electronic equipment, and vehicle. Background Technology

[0002] 12V low-voltage lithium batteries are widely used in new energy passenger vehicles, and their power supply reliability is a crucial foundation for the safe operation of the entire vehicle. Therefore, the low-voltage battery pack charging control function has extremely high engineering value. In emergency situations, sufficient remaining battery power is a prerequisite for the normal operation of the vehicle's safety protection mechanism. Currently, the industry-standard solution uses the SOC (State of Charge) threshold as the condition for determining the charging request. However, due to the influence of algorithms and operating conditions, the SOC estimation error for 12V low-voltage lithium batteries can typically reach 5%. Generally speaking, the accuracy of this SOC estimation is highly related to whether full charge correction, dynamic correction, and static OCV (Open Circuit Voltage) correction are triggered. Under normal circumstances, without triggering corrections, the error will gradually increase due to usage conditions. Control logic that only uses a single SOC threshold to trigger the charging request will be affected by estimation errors, resulting in a delay in the charging action triggering. Therefore, low-voltage lithium batteries in new energy vehicles suffer from a problem of delayed charging action triggering. Summary of the Invention

[0003] In view of this, it is necessary to provide a low-voltage lithium battery charging method, device, electronic device and vehicle to solve the technical problem of delayed charging action triggering in low-voltage lithium batteries of new energy vehicles.

[0004] To address the aforementioned problems, in a first aspect, the present invention provides a method for replenishing low-voltage lithium batteries, comprising: If the SOC of the low-voltage lithium battery is greater than a first preset SOC threshold and less than or equal to a second preset SOC threshold, the vehicle high voltage is requested to charge the low-voltage lithium battery; the first preset SOC threshold is greater than 0. When the duration of the low-voltage lithium battery meeting the voltage replenishment condition reaches a first preset duration, the vehicle high voltage is requested to charge the low-voltage lithium battery; the voltage replenishment condition includes: the low-voltage lithium battery has a discharge current, and the discharge current is less than or equal to a preset current threshold, and the minimum single cell voltage of the low-voltage lithium battery is less than or equal to the replenishment voltage corresponding to the discharge current in the preset replenishment voltage MAP.

[0005] In one possible implementation, the low-voltage lithium battery charging method also includes: When the SOC of the low-voltage lithium battery is greater than or equal to 0 and less than or equal to the first preset SOC threshold, the low-voltage lithium battery is subjected to power-locking control.

[0006] In one possible implementation, when the SOC of the low-voltage lithium battery is greater than a first preset SOC threshold and less than or equal to a second preset SOC threshold, a request is made for the vehicle's high voltage to charge the low-voltage lithium battery, including: When the SOC of the low-voltage lithium battery is greater than the first preset SOC threshold and less than or equal to the third preset SOC threshold, the vehicle high voltage is continuously requested to charge the low-voltage lithium battery; the third preset SOC threshold is less than the second preset SOC threshold. If the low-voltage lithium battery satisfies the condition that its SOC is greater than the third preset SOC threshold and less than or equal to the second preset SOC threshold for a period of time that reaches the second preset duration, the vehicle's high voltage is requested to charge the low-voltage lithium battery within the target time.

[0007] In one possible implementation, the low-voltage lithium battery charging method also includes: Based on the cell voltage values ​​of the low-voltage lithium battery under different SOH conditions, different temperatures, and different discharge currents, a replenishment voltage MAP is generated.

[0008] In one possible implementation, the different temperatures include, in order: -25℃, -10℃, 0℃, 10℃, 25℃, 40℃, and 60℃.

[0009] In one possible implementation, different SOH values ​​are included: 100%, 80%, and 70%.

[0010] In one possible implementation, different discharge currents are included: 1A, 5A, 10A, 20A, 50A, and 100A.

[0011] Secondly, the present invention also provides a low-voltage lithium battery charging device, comprising: The first charging module is used to request the vehicle's high voltage to charge the low-voltage lithium battery when the SOC of the low-voltage lithium battery is greater than a first preset SOC threshold and less than or equal to a second preset SOC threshold; the first preset SOC threshold is greater than 0. The second charging module is used to request the vehicle's high voltage to charge the low-voltage lithium battery when the duration of the low-voltage lithium battery meeting the voltage charging condition reaches a first preset duration. The voltage charging condition includes: the low-voltage lithium battery has a discharge current, and the discharge current is less than or equal to a preset current threshold, and the minimum single cell voltage of the low-voltage lithium battery is less than or equal to the charging voltage corresponding to the discharge current in the preset charging voltage MAP.

[0012] Thirdly, the present invention also provides an electronic device, including a memory and a processor, wherein, The memory is used to store programs; The processor, coupled to the memory, is used to execute the program stored in the memory to implement the steps of the low-voltage lithium battery charging method as described in any of the preceding claims.

[0013] Fourthly, the present invention also provides a vehicle comprising: the aforementioned electronic device.

[0014] The beneficial effects of the above implementation are as follows: The low-voltage lithium battery charging method, device, electronic device, and vehicle provided by the present invention, when the SOC of the low-voltage lithium battery is greater than a first preset SOC threshold and less than or equal to a second preset SOC threshold, request the vehicle's high voltage to charge the low-voltage lithium battery; the first preset SOC threshold is greater than 0; when the duration of the low-voltage lithium battery meeting the voltage charging condition reaches a first preset duration, request the vehicle's high voltage to charge the low-voltage lithium battery; the voltage charging condition includes: the low-voltage lithium battery has a discharge current, and the discharge current is less than or equal to a preset current threshold, and the minimum single-cell voltage of the low-voltage lithium battery is less than or equal to the charging voltage corresponding to the discharge current in the preset charging voltage MAP.

[0015] This invention employs two methods to determine whether low-voltage lithium batteries need to be recharged via the vehicle's high voltage. The first method combines the low-voltage lithium battery's State of Charge (SOC), and the second method combines the low-voltage lithium battery's discharge current and the MAP (Mount Value of Recharge) for recharge. This invention combines these two methods. When the first method results in an SOC detection error leading to recharge anomalies, the second method, which combines the discharge current and MAP, can be triggered. In this case, SOC detection is unnecessary, avoiding recharge lag caused by SOC detection errors or abnormal voltage readings. This solves the technical problem of delayed recharge triggering in low-voltage lithium batteries of new energy vehicles, significantly improving the completeness, accuracy, and reliability of the vehicle's battery recharge request strategy. Attached Figure Description

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

[0017] Figure 1 A flowchart of an embodiment of the low-voltage lithium battery charging method provided by the present invention; Figure 2 A schematic block diagram of an embodiment of the low-voltage lithium battery charging device provided by the present invention; Figure 3 A flowchart illustrating another embodiment of the low-voltage lithium battery charging method provided by the present invention; Figure 4 A schematic diagram of an embodiment of the electronic device provided by the present invention. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0019] In the description of the embodiments of this application, unless otherwise stated, "a plurality of" means two or more.

[0020] In this embodiment of the invention, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, apparatus, product or device that includes a series of steps or modules is not necessarily limited to those steps or modules that are explicitly listed, but may include other steps or modules that are not explicitly listed or that are inherent to such process, method, product or device.

[0021] The naming or numbering of steps in the embodiments of the present invention does not mean that the steps in the method flow must be executed in the time / logical order indicated by the naming or numbering. The execution order of the named or numbered process steps can be changed according to the technical purpose to be achieved, as long as the same or similar technical effect can be achieved.

[0022] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the invention. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0023] This invention provides a method, apparatus, electronic device, and vehicle for replenishing low-voltage lithium batteries, which will be described below.

[0024] This invention provides a method for replenishing low-voltage lithium batteries, which can be implemented by executing an application program in the battery management system (BMS) of a new energy vehicle; such as Figure 1 As shown, the method includes: S101. When the SOC of the low-voltage lithium battery is greater than the first preset SOC threshold and less than or equal to the second preset SOC threshold, the vehicle high voltage is requested to charge the low-voltage lithium battery; the first preset SOC threshold is greater than 0.

[0025] Understandably, the first preset SOC threshold could be 20%, and the second preset SOC threshold could be 60%. The high voltage in new energy vehicles is the core architecture for vehicle power transmission and energy management, and current mainstream platforms cover a voltage range of 300-900V.

[0026] S102. When the duration of the low-voltage lithium battery meeting the voltage replenishment condition reaches a first preset duration, the vehicle high voltage is requested to charge the low-voltage lithium battery. The voltage replenishment condition includes: the low-voltage lithium battery has a discharge current, and the discharge current is less than or equal to a preset current threshold, and the minimum single cell voltage of the low-voltage lithium battery is less than or equal to the replenishment voltage corresponding to the discharge current in the preset replenishment voltage MAP.

[0027] Understandably, the first preset duration can be between 18s and 23s, for example, 20s. The preset current threshold can be between 95A and 105A, with 100A optional. The preset replenishment voltage MAP includes the replenishment voltage corresponding to different temperatures and different discharge currents.

[0028] In the voltage-based power replenishment control logic of small battery packs, for the working condition where the battery pack is discharging and the discharge current is ≤ preset current threshold, and the minimum single cell voltage is ≤ power replenishment voltage MAP threshold, a first preset duration of continuous judgment duration needs to be set. This setting is mainly to avoid voltage detection errors caused by cell polarization effect.

[0029] In some embodiments, the low-voltage lithium battery charging method further includes: When the SOC of the low-voltage lithium battery is greater than or equal to 0 and less than or equal to the first preset SOC threshold, the low-voltage lithium battery is subjected to power-locking control.

[0030] It is understood that when the SOC of the low-voltage lithium battery is greater than or equal to 0 and less than or equal to the first preset SOC threshold, for example, 0≤SOC≤20%, the charging and discharging MOS transistor will be immediately disconnected to stop the charging and discharging of the low-voltage lithium battery and perform power locking to protect the battery pack.

[0031] In some embodiments, when the SOC of the low-voltage lithium battery is greater than a first preset SOC threshold and less than or equal to a second preset SOC threshold, requesting the vehicle's high voltage to charge the low-voltage lithium battery includes: When the SOC of the low-voltage lithium battery is greater than the first preset SOC threshold and less than or equal to the third preset SOC threshold, the vehicle high voltage is continuously requested to charge the low-voltage lithium battery; the third preset SOC threshold is less than the second preset SOC threshold. If the low-voltage lithium battery satisfies the condition that its SOC is greater than the third preset SOC threshold and less than or equal to the second preset SOC threshold for a period of time that reaches the second preset duration, the vehicle's high voltage is requested to charge the low-voltage lithium battery within the target time.

[0032] Understandably, the third preset SOC threshold can be 22%, the first preset SOC threshold can be 20%, and the second preset SOC threshold can be 60%. The second preset duration can be between 3 and 8 seconds, with 5 seconds being an option.

[0033] If the low-voltage lithium battery satisfies the condition that its SOC is greater than the third preset SOC threshold and less than or equal to the second preset SOC threshold for a period of time that reaches the second preset duration, the vehicle's high voltage can be immediately requested to charge the low-voltage lithium battery.

[0034] In some embodiments, the low-voltage lithium battery charging method further includes: Based on the cell voltage values ​​of the low-voltage lithium battery under different SOH conditions, different temperatures, and different discharge currents, a replenishment voltage MAP is generated.

[0035] It is understandable that the compensation voltage MAP can be understood as, for each SOH, using temperature and discharge current as two coordinate axes in different directions, determining the compensation voltage for the corresponding coordinate.

[0036] In some embodiments, the different temperatures include, in sequence: -25°C, -10°C, 0°C, 10°C, 25°C, 40°C, and 60°C.

[0037] Different SOH values, including 100%, 80%, and 70%.

[0038] Different discharge currents are available, including: 1A, 5A, 10A, 20A, 50A and 100A.

[0039] It is understandable that the compensation voltage MAP is only a data example under the condition of SOH=100%. Different lithium battery cells need to be retested, and finally, at least 3 MAPs under different SOH conditions need to be obtained to synthesize a three-dimensional compensation voltage MAP. The testing method is as follows: 1. Test temperature sequence: -25℃, -10℃, 0℃, 10℃, 25℃, 40℃, 60℃; 2. After fully charging different battery cells with SOH values ​​of 100%, 80%, and 70% at room temperature, place them in an incubator for 20 minutes to soak. 3. Discharge the battery cells at 1A, 5A, 10A, 20A, 50A, and 100A respectively, stopping when the SOC reaches 0%; 4. Record the cell voltage values ​​at 60% SOC under different temperatures and discharge currents.

[0040] like Figure 2 As shown, the present invention also provides a low-voltage lithium battery charging device 200, comprising: The first charging module 201 is used to request the vehicle's high voltage to charge the low-voltage lithium battery when the SOC of the low-voltage lithium battery is greater than a first preset SOC threshold and less than or equal to a second preset SOC threshold; the first preset SOC threshold is greater than 0. The second charging module 202 is used to request the vehicle's high voltage to charge the low-voltage lithium battery when the duration of the low-voltage lithium battery meeting the voltage charging condition reaches a first preset duration; the voltage charging condition includes: the low-voltage lithium battery has a discharge current, and the discharge current is less than or equal to a preset current threshold, and the minimum single cell voltage of the low-voltage lithium battery is less than or equal to the charging voltage corresponding to the discharge current in the preset charging voltage MAP.

[0041] The present invention also provides an electronic device, including a memory and a processor, wherein, The memory is used to store programs; The processor, coupled to the memory, is used to execute the program stored in the memory to implement the steps of the low-voltage lithium battery charging method as described in any of the preceding claims.

[0042] Understandably, electronic devices can be battery management systems (BMS).

[0043] The present invention also provides a vehicle comprising: the above-described electronic equipment.

[0044] In summary, existing technologies generally suffer from numerous drawbacks, including difficulty in obtaining voltage threshold parameters, deviations in voltage detection values, potential for charging delays due to SOC detection anomalies, lack of adaptation to temperature operating conditions, and insufficient refinement of control logic. The technical solution proposed in this invention, however, features a simpler overall logic and greater practicality. It effectively avoids the technical shortcomings of existing charging strategies, resolving industry issues such as inaccurate voltage detection, difficulty in obtaining key parameters, and abnormal or delayed charging triggering. This significantly improves the completeness, accuracy, and reliability of vehicle battery charging request strategies.

[0045] The strategy diagram for requesting recharging of low-voltage 12V or 48V lithium batteries is as follows: Figure 3 As shown, it includes: 1) It can determine whether the small battery pack is being charged using "SOC charging method" or "voltage charging method" in any scenario.

[0046] 2) In the "SOC Charging Mode," the BMS exhibits different behaviors depending on the SOC range. For example, if 0 ≤ SOC ≤ 20%, it will immediately disconnect the charging / discharging MOSFETs to lock the battery pack and protect it. If 20% ≤ SOC ≤ 22%, it will continuously send SOCchar requests to charge the battery, requesting the vehicle's high voltage to charge the smaller battery. If 22% SOC ≤ 60%, it will immediately send a SOCchar request to charge the battery after 5 seconds of continuous detection, requesting the vehicle's high voltage to charge the smaller battery. If SOC ≥ 60%, it will not actively request charging.

[0047] 3) In the “Voltage Recharge Mode”, if the small battery pack is still discharging and the voltage is less than or equal to 100A, and the smallest single cell is less than or equal to the MAP value of the charge voltage, and this continues for 20 seconds, then a Voltchar request for charge is sent.

[0048] 4) If the prerequisites for any “voltage compensation method” cannot be met, then only the “SOC compensation method” will be used for compensation.

[0049] The MAP (Magnitude Mapping Value) for the supplementary voltage can be found in Table 1. Table 1: Compensation Voltage MAP

[0050] The above MAP of the replenishment voltage is only an example data point under the condition of SOH=100%. Different lithium battery cells need to be retested to obtain data. Finally, at least three MAPs under different SOH conditions need to be obtained, and a three-dimensional MAP of the replenishment voltage needs to be synthesized. The testing method is as follows: 1. Test temperature sequence: -25℃, -10℃, 0℃, 10℃, 25℃, 40℃, 60℃; 2. After fully charging different battery cells with SOH values ​​of 100%, 80%, and 70% at room temperature, place them in an incubator for 20 minutes to soak. 3. Discharge the battery cells at 1A, 5A, 10A, 20A, 50A, and 100A respectively, stopping when the SOC reaches 0%; 4. Record the cell voltage values ​​at 60% SOC under different temperatures and discharge currents.

[0051] Technical Explanation: 1. Due to the inherent characteristics of battery cells, voltage characteristics shift during cell aging. After SOH (State of Harm) decay, the capacity of the same cell decreases, and its corresponding operating voltage also drops. Therefore, the battery replenishment voltage MAP cannot only adapt to the operating conditions of brand-new cells with 100% SOH; it must also fully consider the operating conditions of aged cells after SOH decay. Big data analysis has verified that the impact of cell SOH aging on voltage parameters exhibits a linear change (satisfying the linear equation y=ax+b). Based on this linear correlation, without the need for extensive cell sampling and testing data, the baseline replenishment voltage MAP value can be directly used, combined with this linear relationship, for dynamic correction, quickly adapting to the replenishment voltage requirements of cells with different aging levels.

[0052] 2. In the voltage-based charging control logic for small battery packs, for conditions where the battery pack is discharging and the discharge current is ≤100A, while the minimum single-cell voltage is ≤ the charging voltage MAP threshold, a continuous judgment duration of 20s needs to be set. This setting is mainly to avoid voltage detection errors caused by cell polarization. Cell polarization significantly affects the terminal voltage value. Even if the temperature, SOC, and SOH states of two cells are exactly the same, differences in the initial operating conditions will lead to significant deviations in the terminal voltage at the same moment. For example, suppose two cells, A and B, are both in a 20A discharge state at t=0. Cell A experiences a 100A high-current discharge condition in the 30s before t=0, while cell B is in a static state during the corresponding period. The detected voltages of the two at t=0 will have a large difference. Actual measurement data shows that the cell polarization effect gradually dissipates with the extension of the static time, and the polarization effect is basically negligible after 13s. To reserve sufficient safety redundancy, completely eliminate polarization interference, and ensure voltage determination accuracy, this solution sets the continuous determination time for this operating condition to 20 seconds to ensure accurate power-up trigger determination and avoid false triggering.

[0053] 3. Industry cell engineers often raise concerns: the 20%–80% SOC range is a stable voltage plateau, within which the cell voltage remains relatively stable. This solution selects the voltage value corresponding to 60% SOC in the middle of this plateau as the MAP threshold for the supplementary charging voltage. Will errors in the accuracy of individual cell voltage acquisition lead to false charging, such as mistakenly triggering a VoltChar charging request during the 80% SOC high-charge stage? The conclusion is that, generally, individual cell acquisition accuracy is limited by the chip used. Most current low-voltage lithium-ion battery BMSs can achieve an individual cell acquisition accuracy of 3mV, with an error of up to 1mV in most cases. Assuming an individual cell acquisition accuracy of 3mV and that the SOC estimation is completely inaccurate, relying solely on the MAP voltage value to determine whether to request charging, considering different discharge currents and temperature ranges, might at most trigger a VoltChar charging request when the actual SOC is 64.8%. Therefore, the impact of excessively high actual SOC due to individual cell acquisition errors when requesting charging is relatively small, generally remaining within 5%.

[0054] In summary, this charging solution avoids the problem of untimely charging caused by the inability to correct the SOC and the continuous accumulation of estimation errors due to limited charging conditions. It effectively protects the battery cells, maintains sufficient power in small batteries, and improves the user's driving experience.

[0055] The low-voltage lithium battery charging device provided in the above embodiments can realize the technical solutions described in the embodiments of the low-voltage lithium battery charging method. The specific implementation principles of each module or unit can be found in the corresponding content in the embodiments of the low-voltage lithium battery charging method, which will not be repeated here.

[0056] like Figure 4 As shown, the present invention also provides an electronic device 400. The electronic device 400 includes a processor 401, a memory 402, and a display 403. Figure 4 Only some components of the electronic device 400 are shown, but it should be understood that it is not required to implement all the components shown, and more or fewer components may be implemented instead.

[0057] In some embodiments, memory 402 may be an internal storage unit of electronic device 400, such as a hard disk or memory of electronic device 400. In other embodiments, memory 402 may also be an external storage device of electronic device 400, such as a plug-in hard disk, smart media card (SMC), secure digital (SD) card, flash card, etc. equipped on electronic device 400.

[0058] Furthermore, the memory 402 may include both internal storage units of the electronic device 400 and external storage devices. The memory 402 is used to store application software and various types of data installed on the electronic device 400.

[0059] In some embodiments, processor 401 may be a central processing unit (CPU), microprocessor, or other data processing chip, used to run program code stored in memory 402 or process data, such as the low-voltage lithium battery charging method of the present invention.

[0060] In some embodiments, display 403 may be an LED display, a liquid crystal display, a touch-sensitive liquid crystal display, or an OLED (Organic Light-Emitting Diode) touchscreen. Display 403 is used to display information from electronic device 400 and to display a visual user interface. Components 401-403 of electronic device 400 communicate with each other via a system bus.

[0061] In some embodiments of the present invention, when the processor 401 executes the low-voltage lithium battery charging program in the memory 402, the following steps can be implemented: If the SOC of the low-voltage lithium battery is greater than a first preset SOC threshold and less than or equal to a second preset SOC threshold, the vehicle high voltage is requested to charge the low-voltage lithium battery; the first preset SOC threshold is greater than 0. When the duration of the low-voltage lithium battery meeting the voltage replenishment condition reaches a first preset duration, the vehicle high voltage is requested to charge the low-voltage lithium battery; the voltage replenishment condition includes: the low-voltage lithium battery has a discharge current, and the discharge current is less than or equal to a preset current threshold, and the minimum single cell voltage of the low-voltage lithium battery is less than or equal to the replenishment voltage corresponding to the discharge current in the preset replenishment voltage MAP.

[0062] It should be understood that when the processor 401 executes the low-voltage lithium battery charging program in the memory 402, in addition to the functions mentioned above, it can also perform other functions, as can be found in the description of the corresponding method embodiments above.

[0063] Furthermore, the embodiments of the present invention do not specifically limit the type of electronic device 400 mentioned. Electronic device 400 can be a mobile phone, tablet computer, personal digital assistant (PDA), wearable device, laptop computer, or other portable electronic device. Exemplary embodiments of portable electronic devices include, but are not limited to, portable electronic devices running iOS, Android, Microsoft, or other operating systems. The aforementioned portable electronic device can also be other portable electronic devices, such as a laptop computer with a touch-sensitive surface (e.g., a touch panel). It should also be understood that in some other embodiments of the present invention, electronic device 400 may not be a portable electronic device, but rather a desktop computer with a touch-sensitive surface (e.g., a touch panel).

[0064] In another aspect, the present invention also provides a non-transitory computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, is implemented to perform the low-voltage lithium battery charging method provided by the methods described above, the method comprising: If the SOC of the low-voltage lithium battery is greater than a first preset SOC threshold and less than or equal to a second preset SOC threshold, the vehicle high voltage is requested to charge the low-voltage lithium battery; the first preset SOC threshold is greater than 0. When the duration of the low-voltage lithium battery meeting the voltage replenishment condition reaches a first preset duration, the vehicle high voltage is requested to charge the low-voltage lithium battery; the voltage replenishment condition includes: the low-voltage lithium battery has a discharge current, and the discharge current is less than or equal to a preset current threshold, and the minimum single cell voltage of the low-voltage lithium battery is less than or equal to the replenishment voltage corresponding to the discharge current in the preset replenishment voltage MAP.

[0065] Those skilled in the art will understand that all or part of the processes of the methods described in the above embodiments can be implemented by a computer program instructing related hardware, and the program can be stored in a computer-readable storage medium. The computer-readable storage medium may be a disk, optical disk, read-only memory, or random access memory, etc.

[0066] The low-voltage lithium battery charging method, device, electronic equipment, and vehicle provided by the present invention have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of the present invention. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of the present invention. Therefore, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A method for replenishing low-voltage lithium batteries, characterized in that, include: If the SOC of the low-voltage lithium battery is greater than a first preset SOC threshold and less than or equal to a second preset SOC threshold, the vehicle high voltage is requested to charge the low-voltage lithium battery; the first preset SOC threshold is greater than 0. When the duration of the low-voltage lithium battery meeting the voltage replenishment condition reaches a first preset duration, the vehicle high voltage is requested to charge the low-voltage lithium battery; the voltage replenishment condition includes: the low-voltage lithium battery has a discharge current, and the discharge current is less than or equal to a preset current threshold, and the minimum single cell voltage of the low-voltage lithium battery is less than or equal to the replenishment voltage corresponding to the discharge current in the preset replenishment voltage MAP.

2. The low-voltage lithium battery charging method according to claim 1, characterized in that, Also includes: When the SOC of the low-voltage lithium battery is greater than or equal to 0 and less than or equal to the first preset SOC threshold, the low-voltage lithium battery is subjected to power-locking control.

3. The low-voltage lithium battery charging method according to claim 1, characterized in that, When the SOC of the low-voltage lithium battery is greater than a first preset SOC threshold and less than or equal to a second preset SOC threshold, a request is made for the vehicle's high voltage to charge the low-voltage lithium battery, including: When the SOC of the low-voltage lithium battery is greater than the first preset SOC threshold and less than or equal to the third preset SOC threshold, the vehicle high voltage is continuously requested to charge the low-voltage lithium battery; the third preset SOC threshold is less than the second preset SOC threshold. If the low-voltage lithium battery satisfies the condition that its SOC is greater than the third preset SOC threshold and less than or equal to the second preset SOC threshold for a period of time that reaches the second preset duration, the vehicle's high voltage is requested to charge the low-voltage lithium battery within the target time.

4. The low-voltage lithium battery charging method according to claim 1, characterized in that, Also includes: Based on the cell voltage values ​​of the low-voltage lithium battery under different SOH conditions, different temperatures, and different discharge currents, a replenishment voltage MAP is generated.

5. The low-voltage lithium battery charging method according to claim 4, characterized in that, The different temperatures are, in order: -25℃, -10℃, 0℃, 10℃, 25℃, 40℃, and 60℃.

6. The low-voltage lithium battery charging method according to claim 4, characterized in that, Different SOH values, including 100%, 80%, and 70%.

7. The low-voltage lithium battery charging method according to claim 4, characterized in that, Different discharge currents are available, including: 1A, 5A, 10A, 20A, 50A and 100A.

8. A low-voltage lithium battery charging device, characterized in that, include: The first charging module is used to request the vehicle's high voltage to charge the low-voltage lithium battery when the SOC of the low-voltage lithium battery is greater than a first preset SOC threshold and less than or equal to a second preset SOC threshold; the first preset SOC threshold is greater than 0. The second charging module is used to request the vehicle's high voltage to charge the low-voltage lithium battery when the duration of the low-voltage lithium battery meeting the voltage charging condition reaches a first preset duration. The voltage charging condition includes: the low-voltage lithium battery has a discharge current, and the discharge current is less than or equal to a preset current threshold, and the minimum single cell voltage of the low-voltage lithium battery is less than or equal to the charging voltage corresponding to the discharge current in the preset charging voltage MAP.

9. An electronic device, characterized in that, Including memory and processor, among which, The memory is used to store programs; The processor, coupled to the memory, is used to execute the program stored in the memory to implement the steps of the low-voltage lithium battery charging method as described in any one of claims 1 to 7.

10. A vehicle, characterized in that, include: The electronic device according to claim 9.

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