Vehicle charging method and vehicle

Abstract

The invention provides a vehicle charging method and a vehicle. The method comprises the following steps: acquiring a charging state of the vehicle; and in response to the charging state being a slow charging state, obtaining state information of a power battery and state information of a storage battery. According to the state information of the power battery and the state information of the storage battery, the charging strategy of the storage battery is determined, that is, not only the state information of the storage battery but also the state information of the power battery are considered when the charging strategy of the storage battery is determined, so that normal running of the vehicle after charging is finished is guaranteed. In conclusion, the charging strategy of the storage battery is determined on the basis of considering the charging rate requirement of the user and the cruising ability of the vehicle, so that the charging strategy of the storage battery is more reasonable, and the experience feeling of the user is improved.

Description

Technical Field

[0001] The present application relates to the technical field of vehicle battery management, and in particular to a vehicle charging method and a vehicle. Background Art

[0002] In new energy vehicles, power batteries serve as a source of energy to propel the vehicle and also power low-voltage loads within the vehicle. However, improper charging strategies can lead to over-discharge, under-charge, and even sulfation, severely impacting battery life. Summary of the Invention

[0003] In view of this, the purpose of this application is to provide a vehicle charging method and a vehicle to solve the problem of unreasonable battery charging strategy.

[0004] Based on the above objectives, a first aspect of the present application provides a vehicle charging method, comprising: Get the vehicle's charging status; In response to the charging state being a slow charging state, acquiring state information of the power battery and state information of the storage battery; A charging strategy for the battery is determined according to the status information of the power battery and the status information of the battery, and the battery is charged according to the charging strategy.

[0005] This embodiment determines the battery charging strategy based on considerations of the user's charging rate requirements and the vehicle's endurance, so as to make the battery charging strategy more reasonable and enhance the user experience.

[0006] Optionally, the status information of the power battery includes the remaining power of the power battery; and determining the charging strategy of the storage battery according to the status information of the power battery and the status information of the storage battery includes: Determining whether the remaining power of the power battery is greater than a first preset power threshold; In response to the remaining power of the power battery being greater than the first preset power threshold, a charging strategy for the battery is determined according to the status information of the battery.

[0007] The method of this embodiment first determines the remaining power of the power battery when determining the battery charging strategy. This prevents the battery charging strategy from affecting the subsequent vehicle endurance and allows for a reasonable charging strategy. This ensures that users can use the vehicle normally after charging is complete, thereby improving user satisfaction.

[0008] Optionally, the battery status information includes an aging degree of the battery; and determining the battery charging strategy based on the battery status information includes: In response to the battery aging degree being less than or equal to a preset aging threshold, the onboard charger is controlled to use pulse power generation to charge the battery. The method of this embodiment can effectively eliminate battery sulfation and extend the battery life.

[0009] Optionally, the battery status information further includes the remaining power of the battery; after controlling the on-board charger to charge the battery using pulse power generation, the method further includes: In response to the real-time remaining power of the battery being greater than a second preset power threshold and the real-time aging degree of the battery being greater than the preset aging threshold, the on-board charger is controlled to charge the battery using a first constant voltage; wherein the first constant voltage is less than or equal to the lower limit voltage during variable voltage charging.

[0010] Through the method of this embodiment, after determining that the battery has sulfation, the battery can be promptly sulfation-charged, and after the sulfation disappears, the subsequent charging strategy of the battery can be adjusted in real time, saving energy consumption during the charging process.

[0011] Optionally, the battery status information includes the remaining power of the battery and the degree of aging of the battery; and determining the battery charging strategy based on the battery status information includes: In response to the remaining power of the battery being greater than a second preset power threshold and the degree of aging of the battery being greater than a preset aging threshold, the on-board charger is controlled to charge the battery using a first constant voltage; wherein the first constant voltage is less than or equal to the lower limit voltage during variable voltage charging.

[0012] The method of this embodiment provides a charging strategy for a battery when the remaining power is sufficient and no sulfation occurs. By charging the battery at a lower first constant voltage, the energy consumption during the charging process is reduced, thereby achieving the purpose of saving energy and avoiding the risk of overcharging the battery.

[0013] Optionally, determining a charging strategy for the battery according to the battery status information includes: In response to the remaining power of the battery being less than or equal to the second preset power threshold and the degree of aging of the battery being greater than the preset aging threshold, the on-board charger is controlled to charge the battery using a second constant voltage; wherein the second constant voltage is greater than or equal to the upper limit voltage during variable voltage charging.

[0014] Through the method of this embodiment, a charging strategy is provided when the remaining battery power is small and there is no sulfation phenomenon. By adopting a higher second constant voltage to charge the battery, the purpose of quickly replenishing the battery is achieved, which can effectively shorten the charging time of the battery.

[0015] Optionally, after controlling the on-board charger to charge the battery using the second constant voltage, the method further includes: In response to the real-time remaining power of the battery being greater than the second power threshold, the on-board charger is controlled to charge the battery using the first constant voltage.

[0016] The method of this embodiment provides a solution for dynamically adjusting the battery charging strategy. That is, as the battery power changes, the charging voltage is adjusted so that the charging voltage at each stage of the charging process can match the current remaining power of the battery. Dynamically adjusting the battery charging strategy can not only improve the battery charging rate, but also significantly save energy consumption.

[0017] Optionally, the method further includes: In response to the remaining power of the power battery being less than or equal to the first power threshold, the on-board charger is controlled to charge the battery using a variable voltage.

[0018] Through the method of this embodiment, a method is provided for prioritizing rapid charging of the power battery and the storage battery when the remaining power of the power battery is insufficient, and after the remaining power of the power battery is sufficient, the subsequent charging strategy of the storage battery is adjusted. The entire charging process not only ensures the vehicle's endurance performance, but also formulates a reasonable charging strategy for the battery, which is conducive to extending the service life of the battery.

[0019] Optionally, the method further includes: The control battery stops supplying power to low-voltage load devices in the vehicle.

[0020] By using the method of this embodiment, during the battery charging process, the battery is controlled to stop supplying power to the low-voltage load equipment in the vehicle, which not only ensures the efficiency of battery charging but also avoids affecting the sulfation charging effect of the battery and avoids the loss of electric energy.

[0021] Based on the same inventive concept, the second aspect of the present application further provides a vehicle, comprising: a memory for storing executable program code; A processor is used to call and run the executable program code from the memory, so that the vehicle executes the method as described in the first aspect.

[0022] As can be seen from the above, the present application provides a vehicle charging method and a vehicle, wherein the method includes: obtaining the charging status of the vehicle. During the process of plug-in charging, the charging status of the vehicle can be a fast charging state or a slow charging state. If the charging status of the vehicle is a fast charging state, in order to consider the user's charging rate requirements, the power battery and the storage battery are directly fast charged at this time, without considering the status information of the power battery and the status information of the storage battery. In response to the charging status being a slow charging state, the status information of the power battery and the status information of the storage battery are obtained. The status information of the power battery may include the remaining power of the power battery, and the status information of the storage battery may include the remaining power of the storage battery and the degree of aging of the storage battery. According to the status information of the power battery and the status information of the storage battery, the charging strategy of the storage battery is determined, that is, when determining the charging strategy of the storage battery, not only the status information of the storage battery but also the status information of the power battery is taken into account. This is because, when plug-in charging is performed, the power battery and the storage battery can be charged simultaneously. However, if the power battery is insufficient, the vehicle's range will be affected. Therefore, when determining the battery charging strategy, the power battery status information must also be taken into account to ensure normal driving of the vehicle after charging is completed. In summary, this application determines the battery charging strategy based on the user's charging rate requirements and the vehicle's range, so as to make the battery charging strategy more reasonable and improve the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in this application or related technologies, the following briefly introduces the drawings required for use in the embodiments or related technical descriptions. Obviously, the drawings described below are merely embodiments of this application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0024] Figure 1 A schematic diagram of the charging principle of a vehicle according to an embodiment of the present application; Figure 2 A schematic flow chart of a vehicle charging method according to an embodiment of the present application; Figure 3 This is a schematic structural diagram of a vehicle charging device according to an embodiment of the present application; Figure 4 This is a schematic diagram of the hardware structure of an electronic device according to an embodiment of the present application. DETAILED DESCRIPTION

[0025] In order to make the objectives, technical solutions and advantages of this application more clear, this application is further described in detail below in combination with specific embodiments and with reference to the accompanying drawings.

[0026] It should be noted that, unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present application should have the usual meanings understood by people with ordinary skills in the field to which this application belongs. The "first", "second" and similar words used in the embodiments of the present application do not indicate any order, quantity or importance, but are only used to distinguish different components. "Include" or "comprise" and similar words mean that the elements or objects appearing before the word cover the elements or objects listed after the word and their equivalents, without excluding other elements or objects. "Connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0027] Figure 1 A schematic diagram of the vehicle's charging principle is shown. Figure 1 The system includes an on-board charger (OBC), a power battery pack, a battery management system (BMS), batteries, an electronic battery sensor (EBS), switches, and other modules. These modules are low-voltage loads powered by the batteries and do not operate during plug-in charging. During plug-in charging, the external charging connector connects to the OBC to charge the power battery and the battery.

[0028] The OBC is connected to the battery and power battery pack via power cables. When an external charging gun is connected to the OBC via a power cable, the OBC converts the AC power from the external power source into high-voltage DC power to charge the power battery pack. It can also provide low-voltage power to the battery through a transformer. Furthermore, when no external power source is present, the power battery pack can charge the battery through the OBC, which converts the high-voltage power from the power battery pack into the low-voltage power required by the battery through a DC step-down operation. The battery is connected to the BMS and other modules via power cables, and can power both the BMS and other modules. A switch is provided on the power cable between the battery and other modules to control the on / off of the power supply line.

[0029] The OBC and BMS are connected via a signal line. The BMS can obtain the vehicle's charging status from the OBC and determine whether it is slow or fast charging. The OBC can also obtain relevant information from the BMS. The power battery pack is connected to the BMS via a signal line, allowing the BMS to detect information such as the remaining charge of the power battery pack. The remaining charge of the power battery pack is recorded as BMS-SOC, which ranges from 0 to 100%. A higher BMS-SOC value indicates a higher remaining charge in the power battery. The battery is connected to the EBS via a signal line. The EBS detects the remaining charge and aging of the battery and transmits the signal to the BMS. The remaining charge signal is recorded as SOC, which ranges from 0 to 100%. A higher SOC value indicates a higher remaining charge. The aging signal of the battery is recorded as SOH, which ranges from 0 to 100%. A higher SOH value indicates a lower aging state. When a battery sulfates, its internal resistance increases. The aging state is proportional to the internal resistance. A higher internal resistance indicates a higher aging state and a lower SOH value. At the same charging voltage, the higher the battery's age, the lower the current flowing through it. The EBS uses this information to determine the battery's SOH value. The EBS is connected to the BMS via a signal line. The BMS receives signals from the EBS and, based on these signals, controls the OBC's recharging of the battery and the method of recharging. The BMS also controls the opening and closing of switches, enabling or disabling the battery to power other modules.

[0030] Currently, improper charging strategies often lead to undercharging or overdischarging of batteries, which can cause battery sulfation. Battery sulfation manifests itself as the formation of difficult-to-restore lead sulfate crystals on the electrode plates, resulting in reduced battery capacity, increased internal resistance, and abnormal charge and discharge behavior. Mild battery sulfation can be corrected through sulfation charging, which involves subjecting the battery to multiple charge and discharge cycles to restore performance.

[0031] In the related art, when a battery is confirmed to be sulfating, it is necessary to remove the battery from the vehicle and charge it using a specialized charger. However, this sulfation charging repair method is not only time-consuming and labor-intensive, but also affects the user's ability to use the vehicle, resulting in a poor user experience. To facilitate sulfation charging repair of the battery, sulfation charging can be provided via a charging gun or power battery. Because the sulfation charging process is relatively time-consuming, an inappropriate battery charging strategy can impact the vehicle. For example, when charging with a charging gun, sulfation charging repair of the battery also charges the power battery. This sulfation charging repair consumes some of the power provided by the external power source, extending the charging time of the power battery and the overall charging time of the vehicle, impacting the user's experience. Sulfation charging repair using the power battery consumes some of the power battery's power, significantly affecting the vehicle's range and resulting in a poor user experience.

[0032] In view of this, the present application provides a vehicle charging method. When formulating the battery charging strategy, it not only takes into account the user's demand for charging time, but also can simultaneously determine the battery charging strategy based on the status information of the power battery and the status information of the battery, so as to make the battery charging strategy more reasonable and enhance the user experience.

[0033] The embodiments of the present application are described in detail below with reference to the accompanying drawings.

[0034] This application provides a method for charging a vehicle, referring to Figure 2 , applied to the power battery management controller BMS, including the following steps: Step 102: Obtain the charging status of the vehicle.

[0035] Specifically, after the BMS obtains the status information of the OBC and determines that the vehicle has started plug-in charging, it also needs to obtain the vehicle's charging status. The vehicle's charging status includes fast charging status and slow charging status. Fast charging uses high-power charging technology, and the power is usually above 40kW. Fast charging can charge the vehicle's battery to about 80% in half an hour to an hour. Slow charging uses lower-power charging technology, and the power is mostly between 3kW and 7kW. Slow charging generally takes 6 to 8 hours or even longer to fully charge the vehicle battery. When plugging in for charging, users can choose slow charging or fast charging according to actual needs. If the user chooses fast charging, it means that the user has high requirements for charging time and hopes to complete the charging of the vehicle in a short time. Therefore, obtaining the vehicle's charging status can help the BMS understand the user's charging time requirements to assist in formulating subsequent battery charging strategies.

[0036] Step 104 : In response to the charging state being a slow charging state, obtain status information of the power battery and status information of the storage battery.

[0037] Specifically, if the charging status is fast charging, it indicates that the user has a high demand for charging time. If the battery is sulfation-charged at this time, the charging time will be significantly extended. Therefore, when the charging status is fast charging, the battery is not sulfation-charged, and there is no need to consider the battery status information. At this time, the OBC can quickly charge the power battery and the storage battery. For the power battery, the OBC provides high-power charging services to quickly replenish the power battery. For the storage battery, the BSM controls the OBC to perform a voltage reduction operation and uses variable voltage to replenish the battery. When using variable voltage to replenish the battery, the OBC's output voltage changes with the battery's remaining charge. Variable voltage charging technology is an intelligent charging strategy that dynamically adjusts the charging voltage based on the battery's real-time status. Its core principle is based on the battery's electrochemical characteristics, SOC, SOH, and other parameters, and optimizes the charging process through closed-loop control. If the remaining power of the battery is low, the output voltage of the OBC is high. When the remaining power of the battery is high, the output voltage of the OBC is reduced to a lower voltage value, so that the purpose of quickly replenishing the battery can be achieved.

[0038] If the charging status is slow, it indicates that the user has a low charging time requirement, meeting the prerequisites for sulfurization charging the battery via a plug-in charger. If sulfurization is confirmed, the battery can be sulfurized. Determining whether sulfurization charging is necessary, and therefore determining the battery charging strategy, requires consideration of both the power battery status information and the battery status information. This is because the sulfurization charging process consumes a significant amount of power, impacting the power battery charging process and potentially resulting in extended charging time or insufficient charge. To avoid impacting subsequent vehicle use, the power battery status information must be considered when determining the battery charging strategy. This power battery status information includes the remaining charge level. If the remaining charge level is low, charging the power battery should be prioritized, with a specific battery charging strategy then developed.

[0039] It should be noted that the battery in this embodiment can be a 12V lead-acid battery or a 12V lithium battery.

[0040] Step 106: Determine a charging strategy for the battery according to the status information of the power battery and the status information of the battery, and charge the battery according to the charging strategy.

[0041] Specifically, different charging strategies can be determined based on the status information of the power battery and the storage battery. Different charging strategies vary in the charging voltage or charging method for the battery. The charging voltage can be higher (e.g., approximately 15V) or lower (e.g., approximately 13V). The charging method can be either variable voltage charging or constant voltage charging. During variable voltage charging, the output voltage of the OBC to the battery varies with the remaining charge of the battery. When the remaining charge is low, the output voltage is higher, and when the remaining charge is high, the output voltage is lower. Constant voltage charging means that the OBC charges the battery at a constant voltage. Typically, if the battery has a high remaining charge, a lower constant voltage is used. In this case, the lower constant voltage can be less than or equal to the minimum voltage during variable voltage charging. This reduces the risk of battery overcharging, extends the battery life, and conserves energy. If the battery has a low remaining charge, a higher constant voltage is used. In this case, the higher constant voltage can be greater than or equal to the maximum voltage during variable voltage charging to achieve fast charging.

[0042] Based on the above steps 102 to 104, the vehicle charging method and vehicle provided in this embodiment include: obtaining the charging status of the vehicle. During the plug-in charging process, the charging status of the vehicle can be a fast charging state or a slow charging state. If the charging status of the vehicle is a fast charging state, in order to consider the user's charging rate requirements, the power battery and the storage battery are directly fast charged at this time, without considering the status information of the power battery and the status information of the storage battery. In response to the charging status being a slow charging state, the status information of the power battery and the status information of the storage battery are obtained. The status information of the power battery may include the remaining power of the power battery, and the status information of the storage battery may include the remaining power of the storage battery and the degree of aging of the storage battery. Based on the status information of the power battery and the status information of the storage battery, the charging strategy of the storage battery is determined, that is, when determining the charging strategy of the storage battery, not only the status information of the storage battery but also the status information of the power battery is taken into account. This is because, when plug-in charging is performed, the power battery and the storage battery can be charged simultaneously. However, if the power battery is insufficient, the vehicle's range will be affected. Therefore, when determining the battery charging strategy, the power battery status information must also be taken into account to ensure normal driving of the vehicle after charging is completed. In summary, this application determines the battery charging strategy based on the user's charging rate requirements and the vehicle's range, so as to make the battery charging strategy more reasonable and improve the user experience.

[0043] Before determining the battery charging strategy, it is necessary to determine the remaining power of the power battery, that is, to determine whether the power battery can subsequently provide power to the vehicle normally. On the premise of ensuring the vehicle's power performance and endurance, the battery charging strategy is determined based on the battery status information. The specific method is described in the following embodiment.

[0044] In some embodiments, the status information of the power battery includes the remaining power of the power battery; and determining the charging strategy of the storage battery according to the status information of the power battery and the status information of the storage battery includes: Determining whether the remaining power of the power battery is greater than a first preset power threshold; In response to the remaining power of the power battery being greater than the first preset power threshold, a charging strategy for the battery is determined according to the status information of the battery.

[0045] Specifically, the status information of the power battery includes the remaining power of the power battery. If the remaining power of the power battery is greater than the first preset power threshold, it means that the current power of the power battery is sufficient and will not affect the subsequent endurance of the vehicle. Exemplarily, the first preset power threshold can be 60%. At this time, the charging strategy of the battery can be determined based on the status information of the battery. The status information of the battery includes the remaining power of the battery and the degree of aging of the battery. According to the remaining power of the battery, it can be determined whether the battery has sufficient power, and then the voltage and charging method for charging the battery can be determined. If the battery is insufficient, in order to quickly replenish the power, a fast replenishment strategy can be adopted, such as using a variable voltage or a higher constant voltage to charge the battery. If the battery has sufficient power, in order to save power consumption, a lower constant voltage can be used to charge the battery.

[0046] Based on the battery's degree of aging, it can be determined whether the battery has sulfation and, therefore, whether it needs sulfation charging. The battery's degree of aging can be reflected by the SOH value: a higher SOH value indicates a lower degree of aging, and a lower SOH value indicates a higher degree of aging. The method of this embodiment first determines the remaining charge of the power battery when determining the battery charging strategy. This prevents the battery charging strategy from affecting the subsequent vehicle's endurance and allows for a reasonable charging strategy. This ensures that users can use the vehicle normally after charging is complete, improving user satisfaction.

[0047] The remaining power of the power battery can be divided into two situations: one is sufficient remaining power of the power battery, and the other is insufficient remaining power of the power battery. The following describes how to formulate a reasonable charging strategy based on the battery status information when the remaining power of the power battery is sufficient through a specific embodiment.

[0048] In some embodiments, the battery status information includes the aging degree of the battery; and determining the battery charging strategy based on the battery status information includes: In response to the aging degree of the battery being less than or equal to a preset aging threshold, the on-board charger is controlled to use pulse power generation to charge the battery.

[0049] Specifically, when the battery's aging level is detected to be less than or equal to a preset aging threshold, it indicates significant sulfation, which will affect the battery's charge and discharge performance and necessitates sulfation charging. For example, the preset aging threshold may be 50%. A lower SOH value indicates a higher degree of aging, while a higher SOH value indicates a lower degree of aging. When sulfation is determined, the onboard charger is directly controlled to charge the battery using pulse power generation, regardless of the battery's remaining charge.

[0050] Pulse current, through high-frequency switching, generates high voltage in a short period of time, creating a strong electric field within the battery. This environment helps eliminate polarization within the battery, improve charging efficiency, and remove impurities such as sulfate crystals. The steeper the leading edge of the pulse signal, the richer the higher harmonics generated. High harmonics promote the dissolution of lead sulfate crystals, especially larger ones, which are more easily dissolved due to the greater energy they receive. If the leading edge of the pulse signal is not steep enough, the lack of high harmonics will reduce the effectiveness of eliminating sulfide. During pulse charging, the battery first charges for a period of time, then enters a rest phase. This allows the hydrogen and oxygen generated by the electrochemical reaction sufficient time to react, reducing the internal pressure of the battery and extending its service life. Pulse waves use short bursts of high voltage (intermittent high voltage) to avoid potential damage to the positive plate caused by high current. This method generates a strong electric field to eliminate lead sulfide crystals while preventing damage to the battery caused by high current. The pulse power generation method of this embodiment can effectively eliminate the sulfation phenomenon of the battery, restore the charging and discharging capabilities of the battery, and extend the service life of the battery.

[0051] After the battery undergoes sulfation charging, its aging degree gradually decreases, and the SOH value may exceed the preset aging threshold, indicating that the sulfation phenomenon of the battery has been eliminated. Then, the charging strategy that is more suitable for the current state of the battery can be readjusted based on the current state information of the battery, as shown below.

[0052] In some embodiments, the battery status information further includes the remaining power of the battery; after controlling the on-board charger to charge the battery using pulse power generation, the method further includes: In response to the real-time remaining power of the battery being greater than a second preset power threshold and the real-time aging degree of the battery being greater than the preset aging threshold, the on-board charger is controlled to charge the battery using a first constant voltage; wherein the first constant voltage is less than or equal to the lower limit voltage during variable voltage charging.

[0053] Specifically, after a battery undergoes sulfuration charging, if its state of health (SOH) exceeds a preset aging threshold, the EBS will monitor the battery's remaining charge in real time. If the battery's remaining charge exceeds a second preset charge threshold, indicating that the battery's performance has recovered and its charge is sufficient, the battery's subsequent charging strategy can be adjusted. Since the battery has sufficient charge, the BMS can control the onboard charger to charge the battery using a first constant voltage. The first constant voltage is a relatively low voltage value, less than or equal to the lower limit voltage of variable voltage generation. For example, if the lower voltage of variable voltage generation is 13.2V, the first constant voltage is less than or equal to 13.2V. Charging the battery using the first constant voltage can save energy and prevent overcharging. The method of this embodiment enables dynamic adjustment of the charging strategy during sulfuration charging. Upon determining that sulfuration has occurred, sulfuration charging can be performed promptly. Once the sulfuration has resolved, the battery's subsequent charging strategy can be adjusted in real time, saving energy during charging.

[0054] In some embodiments, the battery status information includes the remaining power of the battery and the degree of aging of the battery; and determining the battery charging strategy based on the battery status information includes: In response to the remaining power of the battery being greater than a second preset power threshold and the degree of aging of the battery being greater than a preset aging threshold, the on-board charger is controlled to charge the battery using a first constant voltage; wherein the first constant voltage is less than or equal to the lower limit voltage during variable voltage charging.

[0055] Specifically, if the remaining charge (BMS-SOC) of the power battery is greater than the first preset charge threshold, it indicates that the power battery has sufficient charge and will not affect the vehicle's range. In this case, the battery charging strategy can be determined solely based on the battery status information. The charging strategy determination takes into account the battery's remaining charge and the battery's aging level. If the battery's remaining charge (SOC) is greater than the second preset charge threshold, the battery has sufficient charge. Furthermore, if the battery's aging level (SOH) is greater than the preset aging threshold, the battery is not currently experiencing sulfation and does not require sulfation charging. For example, the second preset charge threshold can be 70%, and the preset aging threshold can be 50%. In this case, due to the high battery SOC, to avoid overcharging, the battery can be charged using a first constant voltage. The first constant voltage is a relatively low voltage value that is less than or equal to the lower limit voltage of variable voltage power generation. For example, if the lower limit voltage of variable voltage power generation is 13.2V, then the first constant voltage is less than or equal to 13.2V. Using the first constant voltage to charge the battery can save energy.

[0056] The method of this embodiment provides a charging strategy for a battery when the remaining power is sufficient and no sulfation occurs. By charging the battery at a lower first constant voltage, the energy consumption during the charging process is reduced, thereby achieving the purpose of saving energy and avoiding the risk of overcharging the battery.

[0057] In some embodiments, determining a charging strategy for the battery based on the battery status information includes: In response to the remaining power of the battery being less than or equal to the second preset power threshold and the degree of aging of the battery being greater than the preset aging threshold, the on-board charger is controlled to charge the battery using a second constant voltage; wherein the second constant voltage is greater than or equal to the upper limit voltage during variable voltage charging.

[0058] Correspondingly, if the remaining charge SOC of the battery is less than or equal to the second preset charge threshold, it means that the current SOC of the battery is low and the battery is insufficient. At the same time, if the aging degree SOH of the battery is greater than the preset aging threshold, it means that the battery is not currently sulfided and does not need to be charged for sulfidation. Exemplarily, the second preset charge threshold can be 70%, and the preset aging threshold can be 50%. At this time, since the SOC of the battery is low, in order to ensure that the battery can subsequently supply power to other devices of the vehicle, it is necessary to replenish the battery as soon as possible. Therefore, a second constant voltage can be used to charge the battery. The second constant voltage is higher than the first constant voltage. The second constant voltage is a higher voltage value, and the second constant voltage is greater than or equal to the upper limit voltage in variable voltage power generation. Exemplarily, if the upper limit voltage in variable voltage power generation is 14.78V, the second constant voltage is greater than or equal to 14.78V, and using the second constant voltage to charge the battery can achieve the purpose of quickly replenishing the battery.

[0059] Through the method of this embodiment, a charging strategy is provided when the remaining battery power is small and there is no sulfation phenomenon. By adopting a higher second constant voltage to charge the battery, the purpose of quickly replenishing the battery is achieved, which can effectively shorten the charging time of the battery.

[0060] After the second constant voltage is used to quickly recharge the battery, the remaining power of the battery will change. If the real-time remaining power of the battery is sufficient, the battery charging strategy can be dynamically adjusted to make the battery charging process more efficient and energy-saving. The specific method is as follows.

[0061] In some embodiments, after controlling the onboard charger to charge the battery using the second constant voltage, the method further includes: In response to the real-time remaining power of the battery being greater than the second power threshold, the on-board charger is controlled to charge the battery using the first constant voltage.

[0062] Specifically, after rapidly recharging the battery using the second constant voltage, the EBS will monitor the battery's SOC in real time. If it determines that the battery's SOC has returned to a higher level, such as greater than the second preset charge threshold, it indicates that the battery is currently fully charged. Continuing to charge the battery using the second constant voltage will not only consume more energy but also risk overcharging. Therefore, the BMS can control the OBC to charge the battery at the first constant voltage, reducing energy consumption during the charging process. The first constant voltage is lower than the second constant voltage.

[0063] In addition, other constant voltages can be set between the first constant voltage and the second constant voltage, and each constant voltage can be associated with the remaining power range of the battery. For each remaining power range of the battery, the corresponding constant voltage is used for charging, which can further save energy consumption. For example, when the remaining power of the battery is less than 30%, the second constant voltage is used for charging; when 30% ≤ the remaining power of the battery is less than 60%, the third constant voltage is used for charging; when 60% ≤ the remaining power of the battery, the first constant voltage is used for charging. The third constant voltage is greater than the first constant voltage and less than the second constant voltage.

[0064] The method of this embodiment provides a solution for dynamically adjusting the battery charging strategy. That is, as the battery power changes, the charging voltage is adjusted so that the charging voltage at each stage of the charging process can match the current remaining power of the battery. Dynamically adjusting the battery charging strategy can not only improve the battery charging rate, but also significantly save energy consumption.

[0065] In some embodiments, the battery status information further includes the remaining power of the battery; after controlling the on-board charger to charge the battery using pulse power generation, the method further includes: In response to the real-time remaining power of the battery being less than or equal to the second preset power threshold and the degree of aging of the battery being greater than the preset aging threshold, the on-board charger is controlled to charge the battery using a second constant voltage; wherein the second constant voltage is greater than or equal to the upper limit voltage during variable voltage charging.

[0066] Accordingly, after the battery undergoes sulfation charging, if the battery's degree of aging SOH is greater than a preset aging threshold, it indicates that the battery has eliminated the sulfation phenomenon and the degree of aging is significantly reduced. At this point, the charging strategy can be dynamically adjusted according to the remaining power of the battery. If the battery's remaining power SOC is less than or equal to the second preset power threshold, it indicates that the battery's current SOC is low and the battery needs to be recharged as soon as possible. Therefore, a second constant voltage can be used to charge the battery. The second constant voltage is higher than the first constant voltage. The second constant voltage is a higher voltage value, and the second constant voltage is greater than or equal to the upper limit voltage in variable voltage power generation. For example, if the high voltage in variable voltage power generation is 14.78V, the second constant voltage is greater than or equal to 14.78V, and using the second constant voltage to charge the battery can achieve the purpose of quickly recharging the battery. The second preset power threshold can be 70%, and the preset aging threshold can be 50%.

[0067] Afterwards, the SOC of the battery is detected in real time. If it is determined that the SOC of the battery is greater than the second preset power threshold, the on-board charger is controlled to reduce the second constant voltage to the first constant voltage, and the first constant voltage is used to continue charging the battery, thereby preventing overcharging and saving energy.

[0068] The method of this embodiment provides a dynamic adjustment of the charging strategy during battery sulfation charging. Compared to a fixed charging strategy, this method is more flexible and can provide a more appropriate charging method for the battery. When sulfation occurs, sulfation charging is prioritized to eliminate the sulfation. Afterward, a suitable constant voltage is selected based on the remaining battery charge. This balances the charging rate and energy consumption, resulting in a more reasonable charging strategy.

[0069] The aforementioned embodiments all formulate charging strategies based on the status information of the storage battery when the remaining power of the power battery is greater than the first power threshold. However, if the remaining power of the power battery is less than or equal to the first power threshold, it means that the current power battery is insufficient, so it is necessary to quickly recharge the power battery and the storage battery. The specific method is as follows.

[0070] In some embodiments, the method further comprises: In response to the remaining power of the power battery being less than or equal to the first power threshold, the on-board charger is controlled to charge the battery using a variable voltage.

[0071] Specifically, the power battery status information includes the remaining power of the power battery. If the remaining power of the power battery is less than or equal to a first preset power threshold, it indicates that the power battery is currently insufficient, which may affect the subsequent vehicle range or the user's power needs. For example, the first preset power threshold can be 60%. In this case, the purpose is to quickly recharge the power battery and the storage battery, and the battery status information does not need to be considered. While the BMS controls the OBC to charge the power battery, it also controls the OBC to use a variable voltage to charge the storage battery to achieve the purpose of rapid recharging.

[0072] Afterwards, the real-time remaining power of the power battery is monitored. If the real-time remaining power of the power battery is greater than a first preset power threshold, it indicates that the remaining power of the power battery has recovered to a higher level. At this time, the charging strategy for the subsequent charging process of the battery can be adjusted based on the battery status information. The specific charging strategy is the same as in the previous embodiment and will not be detailed here.

[0073] Through the method of this embodiment, a method is provided for prioritizing rapid charging of the power battery and the storage battery when the remaining power of the power battery is insufficient, and after the remaining power of the power battery is sufficient, the subsequent charging strategy of the storage battery is adjusted. The entire charging process not only ensures the vehicle's endurance performance, but also formulates a reasonable charging strategy for the battery, which is conducive to extending the service life of the battery.

[0074] When charging with a plug, in order to further save energy, you can also pause and interrupt the power supply to vehicle equipment that is not related to the charging process. The specific method is as follows.

[0075] In some embodiments, the method further comprises: The control battery stops supplying power to low-voltage load devices in the vehicle.

[0076] Specifically, Figure 1 The other modules shown include vehicle equipment unrelated to the charging process and are low-voltage loads powered by the battery. Exemplary low-voltage loads include the vehicle's lighting system, air conditioning system, and display system. During battery charging, if the battery is not also powering other low-voltage loads, it will continue to consume battery power, prolonging charging time. Alternatively, if the battery is undergoing sulfation charging, this may affect the battery's sulfation charging efficiency. Therefore, it is necessary to control the battery to stop powering the low-voltage loads in the battery compartment. Specifically, the battery management system (BMS) controls the power lines between the battery and other modules to disconnect the switch, severing the power supply. Once battery charging is complete, the BMS can control the switch to resume power to the low-voltage loads based on the vehicle's actual power needs. Using the method of this embodiment, controlling the battery to stop powering the vehicle's low-voltage loads during charging not only ensures battery charging efficiency but also prevents any impact on the battery's sulfation charging efficiency and energy loss. Furthermore, if the power battery pack is fully charged, the BMS controls the switch to close and the vehicle enters sleep mode.

[0077] It should be noted that the first preset power threshold and the second preset power threshold in the present application can be adjusted appropriately according to the temperature. The reason is that the temperature will have an impact on the remaining power of the power battery and the storage battery. Generally, low temperature will cause the capacity of the battery to decrease, and high temperature will cause the capacity of the battery to increase. Therefore, for the power battery, if it is detected through the BMS that the temperature of the power battery exceeds a certain upper temperature threshold, the first preset power threshold can be appropriately lowered. If the temperature of the power battery is lower than a certain lower temperature threshold, the first preset power threshold can be appropriately increased to ensure the accuracy of the execution of the battery charging strategy. Similarly, if it is detected through the EBS that the temperature of the battery exceeds a certain upper temperature threshold, the second preset power threshold can be appropriately lowered. If the temperature of the battery is lower than a certain lower temperature threshold, the second preset power threshold can be appropriately increased to ensure the accuracy of the execution of the battery charging strategy.

[0078] It should be noted that the method of the embodiment of the present application can be performed by a single device, such as a computer or server. The method of this embodiment can also be applied in a distributed scenario and performed by multiple devices working together. In such a distributed scenario, one of the multiple devices may only perform one or more steps of the method of the embodiment of the present application, and the multiple devices will interact with each other to complete the method.

[0079] It should be noted that the above description is limited to some embodiments of the present application. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recited in the claims may be performed in an order different from that described in the above embodiments and still achieve the desired results. Furthermore, the processes depicted in the accompanying drawings do not necessarily require the specific order or sequential order shown to achieve the desired results. In certain embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0080] Based on the same inventive concept, corresponding to any of the above-mentioned embodiments and methods, the present application also provides a vehicle charging device.

[0081] refer to Figure 3 , the vehicle charging device comprises: A first acquisition module 302 is configured to acquire a charging status of a vehicle; The second acquisition module 304 is configured to acquire status information of the power battery and status information of the storage battery in response to the charging state being a slow charging state; The determination module 306 is configured to determine a charging strategy for the battery according to the status information of the power battery and the status information of the storage battery, and charge the battery according to the charging strategy.

[0082] In some embodiments, the status information of the power battery includes the remaining power of the power battery; the determination module 306 is further configured to determine whether the remaining power of the power battery is greater than a first preset power threshold; in response to the remaining power of the power battery being greater than the first preset power threshold, determine the charging strategy of the battery according to the status information of the battery.

[0083] In some embodiments, the battery status information includes the degree of aging of the battery; the determination module 306 is further configured to control the on-board charger to use pulse power generation to charge the battery in response to the degree of aging of the battery being less than or equal to a preset aging threshold.

[0084] In some embodiments, the battery status information also includes the remaining charge of the battery; after controlling the on-board charger to charge the battery using pulse power generation, the determination module 306 is further configured to, in response to the real-time remaining charge of the battery being greater than a second preset charge threshold and the real-time degree of aging of the battery being greater than the preset aging threshold, control the on-board charger to charge the battery using a first constant voltage. In some embodiments, the battery status information includes the remaining charge of the battery and the degree of aging of the battery; the determination module 306 is further configured to, in response to the remaining charge of the battery being greater than the second preset charge threshold and the degree of aging of the battery being greater than the preset aging threshold, control the on-board charger to charge the battery using the first constant voltage.

[0085] In some embodiments, the determination module 306 is further configured to control the on-board charger to charge the battery using a second constant voltage in response to the remaining power of the battery being less than or equal to the second preset power threshold and the degree of aging of the battery being greater than the preset aging threshold; wherein the second constant voltage is higher than the first constant voltage.

[0086] In some embodiments, after controlling the on-board charger to use the second constant voltage to charge the battery, the determination module 306 is further configured to control the on-board charger to use the first constant voltage to charge the battery in response to the real-time remaining power of the battery being greater than the second power threshold.

[0087] In some embodiments, the determination module 306 is further configured to control the on-board charger to charge the battery using a variable voltage in response to the remaining power of the power battery being less than or equal to the first power threshold.

[0088] In some embodiments, the determination module 306 is further configured to control the battery to stop supplying power to low-voltage load devices in the vehicle.

[0089] For the convenience of description, the above devices are described as being divided into various modules according to their functions. Of course, when implementing this application, the functions of each module can be implemented in the same or multiple software and / or hardware.

[0090] The device of the above embodiment is used to implement the corresponding vehicle charging method in any of the above embodiments, and has the beneficial effects of the corresponding method embodiment, which will not be repeated here.

[0091] Based on the same inventive concept, corresponding to any of the above-mentioned embodiments and methods, the present application also provides an electronic device, including a memory, a processor, and a computer program stored in the memory and runnable on the processor, wherein when the processor executes the program, the vehicle charging method described in any of the above embodiments is implemented.

[0092] Figure 4 A more specific hardware structure diagram of an electronic device provided in this embodiment is shown. The device may include: a processor 1010, a memory 1020, an input / output interface 1030, a communication interface 1040, and a bus 1050. The processor 1010, the memory 1020, the input / output interface 1030, and the communication interface 1040 are communicatively connected to each other within the device via the bus 1050.

[0093] The processor 1010 can be implemented using a general-purpose CPU (Central Processing Unit), a microprocessor, an application-specific integrated circuit (ASIC), or one or more integrated circuits, and is used to execute relevant programs to implement the technical solutions provided in the embodiments of this specification.

[0094] The memory 1020 can be implemented in the form of ROM (Read Only Memory), RAM (Random Access Memory), static storage devices, dynamic storage devices, etc. The memory 1020 can store an operating system and other application programs. When the technical solutions provided in the embodiments of this specification are implemented through software or firmware, the relevant program code is stored in the memory 1020 and is called and executed by the processor 1010.

[0095] The input / output interface 1030 is used to connect to input / output modules to enable information input and output. The input / output modules can be configured as components within the device (not shown) or externally connected to the device to provide corresponding functions. Input devices may include a keyboard, mouse, touch screen, microphone, and various sensors. Output devices may include a display, speaker, vibrator, indicator light, and the like.

[0096] The communication interface 1040 is used to connect to a communication module (not shown) to enable communication between the device and other devices. The communication module can communicate via wired means (such as USB, network cable, etc.) or wireless means (such as mobile network, Wi-Fi, Bluetooth, etc.).

[0097] The bus 1050 comprises a pathway for transmitting information between various components of the device, such as the processor 1010 , the memory 1020 , the input / output interface 1030 , and the communication interface 1040 .

[0098] It should be noted that although the above device only shows the processor 1010, the memory 1020, the input / output interface 1030, the communication interface 1040, and the bus 1050, in a specific implementation, the device may also include other components necessary for normal operation. In addition, it will be understood by those skilled in the art that the above device may only include the components necessary to implement the embodiments of this specification, and does not necessarily include all the components shown in the figure.

[0099] The electronic device of the above embodiment is used to implement the corresponding vehicle charging method in any of the above embodiments, and has the beneficial effects of the corresponding method embodiment, which will not be repeated here.

[0100] Based on the same inventive concept, corresponding to any of the above-mentioned embodiment methods, the present application also provides a non-transitory computer-readable storage medium, which stores computer instructions, and the computer instructions are used to enable the computer to execute the vehicle charging method described in any of the above embodiments.

[0101] The computer-readable media of this embodiment includes permanent and non-permanent, removable and non-removable media that can be used to store information by any method or technology. The information can be computer-readable instructions, data structures, program modules, or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, compact disc read-only memory (CD-ROM), digital versatile disc (DVD) or other optical storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information that can be accessed by a computing device.

[0102] The computer instructions stored in the storage medium of the above embodiment are used to enable the computer to execute the vehicle charging method described in any of the above embodiments, and have the beneficial effects of the corresponding method embodiments, which will not be repeated here.

[0103] Based on the same concept, corresponding to any of the above-mentioned embodiments, the present application also provides a computer program product, including computer program instructions. When the computer program instructions are run on a computer, the computer executes the method described in any of the above embodiments, which has the beneficial effects of the corresponding method embodiments and will not be repeated here.

[0104] Those skilled in the art should understand that the discussion of any of the above embodiments is merely illustrative and is not intended to imply that the scope of the present application is limited to these examples. In line with the present application, the technical features in the above embodiments or different embodiments may be combined, the steps may be implemented in any order, and there are many other variations of the different aspects of the embodiments of the present application as described above, which are not provided in detail for the sake of simplicity.

[0105] In addition, to simplify the description and discussion, and to avoid obscuring the understanding of the embodiments of the present application, well-known power / ground connections to integrated circuit (IC) chips and other components may or may not be shown in the provided figures. Furthermore, devices may be shown in block diagram form to avoid obscuring the understanding of the embodiments of the present application, and this also takes into account the fact that the implementation details of these block diagram devices are highly dependent on the platform on which the embodiments of the present application will be implemented (i.e., these details should be fully understood by those skilled in the art). Where specific details (e.g., circuits) are set forth to describe the exemplary embodiments of the present application, it will be apparent to those skilled in the art that the embodiments of the present application can be implemented without these specific details or with variations therefrom. Therefore, these descriptions should be considered illustrative rather than restrictive.

[0106] Although the present invention has been described in conjunction with specific embodiments thereof, many alternatives, modifications, and variations of these embodiments will be apparent to those skilled in the art based on the foregoing description. For example, other memory architectures (e.g., dynamic RAM (DRAM)) may utilize the discussed embodiments.

[0107] The embodiments of the present application are intended to cover all such substitutions, modifications, and variations that fall within the broad scope of the present application. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the embodiments of the present application should be included in the scope of protection of the present application.

Claims

1. A vehicle charging method, characterized in that: include: Get the vehicle's charging status; In response to the charging state being a slow charging state, acquiring state information of the power battery and state information of the storage battery; A charging strategy for the battery is determined according to the status information of the power battery and the status information of the battery, and the battery is charged according to the charging strategy.

2. The method according to claim 1, characterized in that The state information of the power battery includes the remaining power of the power battery; and determining the charging strategy of the storage battery according to the state information of the power battery and the state information of the storage battery includes: Determining whether the remaining power of the power battery is greater than a first preset power threshold; In response to the remaining power of the power battery being greater than the first preset power threshold, a charging strategy for the battery is determined according to the status information of the battery.

3. The method according to claim 2, characterized in that The battery status information includes the aging degree of the battery; and determining the battery charging strategy based on the battery status information includes: In response to the aging degree of the battery being less than or equal to a preset aging threshold, the on-board charger is controlled to use pulse power generation to charge the battery.

4. The method according to claim 3, characterized in that The battery status information also includes the remaining power of the battery; after controlling the on-board charger to use pulse power generation to charge the battery, the method further includes: In response to the real-time remaining power of the battery being greater than a second preset power threshold and the real-time aging degree of the battery being greater than the preset aging threshold, the on-board charger is controlled to charge the battery using a first constant voltage; wherein the first constant voltage is less than or equal to the lower limit voltage during variable voltage charging.

5. The method according to claim 2, characterized in that The battery status information includes the remaining power of the battery and the aging degree of the battery; and determining the battery charging strategy based on the battery status information includes: In response to the remaining power of the battery being greater than a second preset power threshold and the degree of aging of the battery being greater than a preset aging threshold, the on-board charger is controlled to charge the battery using a first constant voltage; wherein the first constant voltage is less than or equal to the lower limit voltage during variable voltage charging.

6. The method according to claim 5, characterized in that The determining of a charging strategy for the battery according to the battery status information includes: In response to the remaining power of the battery being less than or equal to the second preset power threshold and the degree of aging of the battery being greater than the preset aging threshold, the on-board charger is controlled to charge the battery using a second constant voltage; wherein the second constant voltage is greater than or equal to the upper limit voltage during variable voltage charging.

7. The method according to claim 6, characterized in that After controlling the on-board charger to charge the battery using the second constant voltage, the method further includes: In response to the real-time remaining power of the battery being greater than the second power threshold, the on-board charger is controlled to charge the battery using the first constant voltage.

8. The method according to claim 2, characterized in that The method further comprises: In response to the remaining power of the power battery being less than or equal to the first power threshold, the on-board charger is controlled to charge the battery using a variable voltage.

9. The method according to any one of claims 2 to 8, characterized in that: The method further comprises: The control battery stops supplying power to low-voltage load devices in the vehicle.

10. A vehicle, characterized in that: The vehicle comprises: a memory for storing executable program code; A processor is configured to call and run the executable program code from the memory, so that the vehicle executes the method according to any one of claims 1 to 9.

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