Charging method and charging system for low-voltage battery of vehicle, storage medium and vehicle

Abstract

The invention discloses a charging method, a charging system, a storage medium and a vehicle, and the charging method comprises the steps: controlling a voltage regulation module to output a first charging voltage to charge a low-voltage battery when the vehicle is in a vehicle use scene; when the vehicle is in the parking lot scene, the output voltage of the low-voltage battery is detected, and / or whether the power battery is in a charging state is detected; and when the output voltage of the low-voltage battery is lower than the set value, and / or when the power battery is in the charging state, the voltage regulating module is controlled to output a second charging voltage to charge the low-voltage battery. Wherein the first charging voltage is smaller than the second charging voltage. In the application, the first charging voltage is boosted to the second charging voltage through the voltage regulating module to charge the low-voltage battery, so that rapid charging and de-vulcanization of the low-voltage battery can be realized through the relatively larger second charging voltage, and meanwhile, the requirement of low power consumption of the whole vehicle is considered.

Description

Technical Field

[0001] This application relates to the field of automotive technologies, and particularly to a charging method, a charging system, a storage medium, and a vehicle for a low-voltage battery of a vehicle. Background Art

[0002] Generally, a low-voltage system is provided on a vehicle to power devices such as lights, data interfaces, and cigarette lighters inside the vehicle. The vehicle usually also includes energy storage components such as a low-voltage battery, which is used to supply power to devices such as lights, data interfaces, and cigarette lighters inside the vehicle. For new energy vehicles, when the vehicle is powered on, the low-voltage system is powered by devices such as a fuel generator or a voltage regulation module of a power battery, and at this time, the low-voltage battery is in a charging state. When the vehicle is powered off, the low-voltage system is powered by the low-voltage battery to maintain functions such as interior lights and data interfaces, and at this time, the low-voltage battery is in a discharging state.

[0003] When the user's vehicle is parked for a long time, for example, not used for a week or half a month, due to the large number of electrical devices on the vehicle, the low-voltage power consumption of the whole vehicle is high and the power consumption is fast, resulting in the low-voltage battery being discharged, and then the electrodes of the low-voltage battery being in a sulfide state. The charging speed of the low-voltage battery in the sulfide state will be reduced geometrically, and the vehicle needs to be in the powered-on state for a longer time. In such a vicious cycle, manual intervention is required to replenish the power of the low-voltage battery. Otherwise, the low-voltage battery cannot be effectively replenished, some functions of the whole vehicle cannot be realized normally, and the life of the low-voltage battery will be greatly attenuated.

[0004] To solve the above problems, in the prior art, the low-voltage battery is usually monitored in real time and woken up for charging. Existing new energy vehicles only distinguish between the powered-on scenario and the powered-off scenario. For the scenario where the low-voltage battery is discharged, the whole vehicle is simply woken up and powered on, and then the low-voltage battery is charged. By real-time monitoring of the voltage of the low-voltage battery, phenomena such as discharge and sulfide of the low-voltage battery are avoided. However, once the vehicle is parked for too long and the power of the power battery itself has been exhausted, it is impossible to support waking up the whole vehicle to charge the low-voltage battery, and the problem of sulfide of the low-voltage battery electrodes will still occur, and then a vicious cycle of fast power consumption and slow charging will appear. At this time, the low-voltage battery will frequently trigger the scenario of powered-on charging, which will lead to the problem of too fast consumption of the whole vehicle's power battery and rapid decline of the cruising range. Summary of the Invention

[0005] In view of this, this application provides a charging method, a charging system, a storage medium, and a vehicle for a low-voltage battery of a vehicle to solve the problems of slow charging speed of energy storage components and high power consumption of the whole vehicle in the prior art.

[0006] In a first aspect, this application provides a charging method for a low-voltage battery of a vehicle, which includes:

[0007] When the vehicle is in a driving scenario, control the voltage regulation module to output a first charging voltage to charge the low-voltage battery.

[0008] When the vehicle is in a parking scenario, detect the output voltage of the low-voltage battery and / or detect whether the power battery is in a charging state; when the output voltage of the low-voltage battery is lower than a set value and / or when the power battery is in a charging state, then control the voltage regulation module to output a second charging voltage to charge the low-voltage battery. Wherein, the first charging voltage is less than the second charging voltage.

[0009] In a supplementary charging scenario, the output voltage of the low-voltage battery can be detected. According to the output voltage of the low-voltage battery, when the low-voltage battery needs to be charged, the charging voltage can be appropriately increased through the voltage regulation module, so as to achieve rapid supplementary charging and desulfurization of the low-voltage battery. And in the driving scenario, a relatively small first charging voltage can also be output through the voltage regulation module to supply power to low-voltage electrical equipment, thus taking into account both the rapid supplementary charging and desulfurization requirements of the low-voltage battery and the low-power consumption requirement of the whole vehicle.

[0010] In another supplementary charging scenario, for an electric vehicle, it can be detected whether the power battery is in a charging state. If the power battery is in a state of being charged by the charging gun, the voltage regulation module can also be controlled to raise the first charging voltage to the second charging voltage to charge the low-voltage battery, so that rapid supplementary charging and desulfurization of the low-voltage battery can be achieved through the relatively larger second charging voltage. At the same time, during the process of charging the power battery through the charging gun and supplying power to the low-voltage battery through the power battery, the power battery also supplies power to the low-voltage system. At this time, the charging voltage of the power battery to the low-voltage battery and the power supply voltage to the low-voltage system are raised from the first charging voltage to the second charging voltage. Although the relatively high second charging voltage will cause relatively large power consumption of the low-voltage system, since the power battery is continuously charged, the amount of electricity charged into the power battery per unit time is greater than the amount of electricity consumed by the power battery per unit time. Therefore, the stored electricity of the power battery can maintain a net increase state, so that the excessive power consumption of the low-voltage system will not affect the battery life of the power battery.

[0011] In a possible implementation manner, when the vehicle is in a parking scenario, the method further includes: detecting the health degree of the low-voltage battery. If the health degree is less than a first set value, control the voltage regulation module to output a third charging voltage to charge the low-voltage battery; the third charging voltage is greater than the first charging voltage. Wherein, the health degree can reflect the health state of the low-voltage battery. According to the health degree of the low-voltage battery, the voltage value after raising the first charging voltage can be comprehensively determined, so that the raised voltage value can take into account both the rapid supplementary charging and desulfurization of the low-voltage battery and the low-power consumption of the whole vehicle.

[0012] In a possible implementation, the third charging voltage is greater than the second charging voltage. In each of the above-mentioned supplementary charging scenarios, the first charging voltage can be first increased to the second charging voltage by a voltage regulating module to charge the low-voltage battery. Among them, the second charging voltage can solve most of the sulfation problems of the low-voltage battery, that is, the second charging voltage can correspond to the average sulfation degree of the low-voltage battery. Then, the health of the low-voltage battery can be further detected, and the second charging voltage can be dynamically adjusted according to the health. Exemplarily, when the health is poor, the sulfation degree of the low-voltage battery is lower than the aforementioned average sulfation degree, and the second charging voltage cannot effectively desulfurize. At this time, the second charging voltage can be further adjusted to a higher third charging voltage by the voltage regulating module. For example, after increasing the first charging voltage of 14.2V to the second charging voltage of 14.4V, the second charging voltage of 14.4V can be further increased to the third charging voltage of 14.45V, so that the charging voltage of the low-voltage battery can be accurately matched with the sulfation degree, and effective desulfurization can be achieved.

[0013] In a possible implementation, the health includes the maximum charging capacity and / or the maximum charging current. Among them, the maximum charging capacity can represent the upper limit of the charging power of the low-voltage battery, and the maximum charging current can represent the maximum value that the current of the low-voltage battery can accept under specific voltage conditions. Both the maximum charging capacity and the maximum charging current can reflect the sulfation degree of the low-voltage battery. That is to say, according to the health of the low-voltage battery, the charging voltage of the low-voltage battery can be accurately matched with the sulfation degree, and effective desulfurization can be achieved.

[0014] In a possible implementation, when the vehicle is in a parking scenario, the method further includes: detecting the remaining power of the low-voltage battery. If the remaining power is less than a second set value, detecting the health of the low-voltage battery. If the health is less than a third set value, controlling the voltage regulating module to output a fourth charging voltage to charge the low-voltage battery. The fourth charging voltage is greater than the first charging voltage. Among them, the remaining power can represent the remaining power of the low-voltage battery during use. By comprehensively considering the remaining power and health of the low-voltage battery, the voltage value after the first charging voltage is increased can be more accurately determined according to the state of the low-voltage battery, so that the increased voltage value can take into account both the rapid supplementary charging and desulfurization of the low-voltage battery and the low power consumption of the whole vehicle.

[0015] In a possible implementation, the method further includes: detecting a charging current, and if the charging current is less than a fourth set value, controlling the voltage regulating module to output a fifth charging voltage to charge the low-voltage battery. The fifth charging voltage is greater than the first charging voltage. Herein, the charging current is the actual charging current during the charging process of the low-voltage battery. If the charging current is too large, it will cause relatively high power consumption. Therefore, a fourth set value of the charging current can be preset in the main control module to adjust the charging voltage according to the actual charging current value and the fourth set value, so that the charging voltage can take into account efficient power replenishment, desulfurization, and low power consumption of the whole vehicle at the same time.

[0016] In a possible implementation, both the first charging voltage and the second charging voltage are between 12V and 16V. Within this voltage range, normal operation of the low-voltage electrical devices of the whole vehicle can be achieved, and rapid power replenishment and desulfurization of the low-voltage battery can also be achieved.

[0017] In a possible implementation, the first charging voltage is between 14.15V and 14.25V, and the second charging voltage is between 14.35V and 14.45V. Among them, the first charging voltage can be consistent with the operating voltage of the low-voltage system. That is to say, in the vehicle use scenario, either the fuel generator or the power battery can provide a constant voltage, and this constant voltage can charge the low-voltage battery and supply power to the low-voltage system at the same time. Thus, by making the first charging voltage between 14.15V and 14.25V, normal operation of the low-voltage electrical devices in the low-voltage system can be ensured while charging the low-voltage battery.

[0018] In a second aspect, the present application further provides a charging system, which includes a main control module, a voltage regulating module, and a low-voltage battery, wherein: the main control module is respectively connected to the voltage regulating module and the low-voltage battery, and is used for controlling the voltage regulating module to output a first charging voltage to charge the low-voltage battery when the vehicle is in the vehicle use scenario. The main control module is further used for detecting the output voltage of the low-voltage battery and / or detecting whether the power battery is in a charging state when the vehicle is in the parking scenario; when the output voltage of the low-voltage battery is lower than a set value and / or when the power battery is in a charging state, then controlling the voltage regulating module to output a second charging voltage to charge the low-voltage battery. Among them, the first charging voltage is less than the second charging voltage.

[0019] Among them, this charging system can be used to implement the charging method provided in any embodiment of the present application, and this charging system has similar technical effects to the foregoing charging method, which will not be elaborated herein.

[0020] In a possible implementation, the charging system further includes a power battery, the power battery is connected to the main control module, and the power battery is connected to the low-voltage battery through the voltage regulating module. The power battery is connected to the low-voltage battery through the voltage regulating module, so that the low-voltage battery can be charged by the power battery.

[0021] In a third aspect, the present application further provides a storage medium, where the storage medium includes a stored application program, and the application program executes the charging method for a vehicle low-voltage battery provided in the first aspect of the present application.

[0022] In a fourth aspect, the present application further provides a vehicle, which includes the charging system provided in the second aspect of the present application and the storage medium provided in the third aspect of the present application. Among them, the vehicle including the aforementioned charging system has similar technical effects to the aforementioned charging system, which will not be elaborated here.

[0023] It should be understood that the above general description and the following detailed description are only exemplary and do not limit the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0025] Figure 1 It is a flowchart of a charging method provided by an embodiment of the present application;

[0026] Figure 2 It is a flowchart of a charging method provided by another embodiment of the present application;

[0027] Figure 3 It is a schematic diagram of adjusting the charging voltage according to the health degree in the present application;

[0028] Figure 4 It is another schematic diagram of adjusting the charging voltage according to the health degree in the present application;

[0029] Figure 5 It is a flowchart of a charging method provided by yet another embodiment of the present application;

[0030] Figure 6 It is a schematic diagram of adjusting the charging voltage according to the remaining power and health degree in the present application;

[0031] Figure 7 It is a flowchart of a charging method provided by still another embodiment of the present application;

[0032] Figure 8 Schematic structural diagram of the charging system provided by the embodiments of the present application. Detailed implementation manners

[0033] In order to better understand the technical solutions of the present application, the embodiments of the present application will be described in detail below with reference to the accompanying drawings.

[0034] It should be clear that the described embodiments are only a part of the embodiments of the present application, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts belong to the scope of protection of the present application.

[0035] The terms used in the embodiments of the present application are only for the purpose of describing specific embodiments, and are not intended to limit the present application. The singular forms "a", "the" and "said" used in the embodiments of the present application and the appended claims are also intended to include the plural forms, unless the context clearly indicates otherwise.

[0036] It should be understood that the term " / and / " used herein is only a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B may represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " herein generally represents an "or" relationship between the associated objects before and after.

[0037] In the description of the present application, unless otherwise clearly defined and limited, the terms "first" and "second" are only used for the purpose of description, and cannot be understood as indicating or implying relative importance; unless otherwise specified or stated, the term "plural" means two or more; the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, an integral connection, or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0038] A low-voltage system is usually provided on the vehicle to operate devices such as lights, data interfaces (such as USB interfaces, Type-C interfaces, etc.), windshield wipers, cigarette lighters, etc. inside the vehicle. The vehicle usually also includes energy storage components such as a low-voltage battery, and the low-voltage battery is used to supply power to devices such as lights, windshield wipers, cigarette lighters, etc. inside the vehicle. For example, for a new energy vehicle, when the vehicle is powered on, the low-voltage system is powered by a fuel generator or a power battery. At the same time, the low-voltage battery can be charged by the fuel generator or the power battery, that is, the low-voltage battery is in a charging state. When the vehicle is powered off, the low-voltage system can be powered by the low-voltage battery to maintain functions such as interior lights, windshield wipers, cigarette lighters, etc. At this time, the low-voltage battery is in a discharging state.

[0039] However, when the vehicle is parked for a long time, for example, the user does not use the vehicle for a week or half a month. Due to the large number of electrical devices on the vehicle, the low-voltage power consumption of the whole vehicle is relatively high and the power consumption is fast. Without charging for a long time, the low-voltage battery will lose power, which will in turn cause the electrodes of the low-voltage battery to be in a sulfide state. The charging speed of the low-voltage battery in the sulfide state will decrease geometrically, which requires the whole vehicle to be in the power-on state for a longer time, resulting in the problems of fast power consumption and slow charging of the whole vehicle. In such a vicious cycle, manual intervention is required to charge the low-voltage battery. Otherwise, the low-voltage battery cannot be effectively charged automatically, some functions of the whole vehicle cannot be realized normally, and the life of the low-voltage battery will be greatly attenuated.

[0040] In the prior art, to solve the above problems, the low-voltage battery is usually detected in real time, and the whole vehicle can be automatically awakened to charge the low-voltage battery. For example, existing new energy vehicles generally only distinguish between the power-on scenario and the power-off scenario. In the scenario of low-voltage battery power loss, the whole vehicle is simply awakened to power on, and the power battery is used to charge the low-voltage battery. By detecting the voltage of the low-voltage battery, phenomena such as power loss and sulfidation of the low-voltage battery can be avoided. However, once the vehicle is parked for too long and the power of the power battery itself has been exhausted, the whole vehicle cannot be automatically awakened to charge the low-voltage battery, and the problem of sulfidation of the low-voltage battery electrodes will still occur, resulting in a vicious cycle of fast power consumption and slow charging. At this time, the low-voltage battery will frequently trigger the power-on charging scenario, which will in turn lead to the problem of rapid consumption of the power battery of the whole vehicle and a rapid decrease in the cruising range.

[0041] In addition, the working voltage of the low-voltage system is usually a constant voltage value, and the charging voltage of the low-voltage battery is usually the same as the working voltage of the low-voltage system. That is to say, the voltage value provided by the fuel generator or the power battery for the low-voltage system and the charging voltage value for charging the low-voltage battery are both the same constant voltage value. When ensuring the normal operation of the low-voltage electrical equipment in the low-voltage system, if the constant voltage value is small, the rapid charging and desulfurization requirements of the low-voltage battery cannot be met. When ensuring the normal operation of the low-voltage electrical equipment in the low-voltage system, if the constant voltage value is large, although the rapid charging and desulfurization requirements of the low-voltage battery can be met, it will also cause a sharp increase in the power consumption of the low-voltage system. Therefore, it is difficult for the fuel generator or the power battery to output a constant voltage value to simultaneously meet the requirements of rapid charging and desulfurization of the low-voltage battery and the requirement of low power consumption of the whole vehicle.

[0042] An embodiment of the present application provides a charging method, which can charge the low-voltage battery of a vehicle. Among them, the low-voltage battery provided by the embodiment of the present application can be used in pure electric vehicles, hybrid electric vehicles, range-extended electric vehicles or fuel vehicles. The low-voltage battery can supply power to low-voltage electrical devices in the vehicle, such as lights, windshield wipers, cigarette lighters, instrument panels, etc. Among them, the low-voltage battery can be a storage battery (such as a lead-acid battery) or a lithium battery, etc., which is used to store electrical energy. In this embodiment, the low-voltage battery is taken as an example of a lead-acid battery for illustration. The low-voltage battery can output a low voltage. Exemplarily, the low-voltage battery can output a voltage of 12V to 16V, and this low voltage can meet the power consumption requirements of low-voltage electrical devices in the vehicle, such as lights, windshield wipers, cigarette lighters, etc.

[0043] Figure 1 The flowchart of the charging method provided by an embodiment of the present application is shown in reference to Figure 1 , and the charging method provided in this embodiment includes the following driving scenarios and parking scenarios.

[0044] When the vehicle is in the driving scenario, control the voltage regulating module to output the first charging voltage to charge the low-voltage battery.

[0045] Among them, the "driving scenario" refers to the scenario when the user is in the vehicle or when the user remotely controls the internal functions of the vehicle. At this time, the vehicle is also in the powered-on state. In this scenario, the vehicle can supply power to low-voltage electrical devices in the low-voltage system, such as lights, windshield wipers, cigarette lighters, etc., through a fuel generator or a power battery, and at the same time can charge the low-voltage battery. That is to say, in the driving scenario, the low-voltage battery can be in a charging state. Among them, the first charging voltage can be a voltage that enables the low-voltage electrical devices in the low-voltage system to work normally.

[0046] The voltage regulating module can be a DC-DC converter (DC-DC converter), and the DC-DC converter can also be called a DC chopper, which is used to convert a fixed DC voltage into a variable DC voltage. The DC-DC converter can be applied to the above-mentioned various types of vehicles, such as pure electric vehicles, hybrid electric vehicles, range-extended electric vehicles or fuel vehicles, etc. Exemplarily, when the vehicle is a pure electric vehicle, the voltage regulating module can be connected to the power battery, and the power battery can supply power to the low-voltage electrical devices in the low-voltage system through the voltage regulating module, or charge the low-voltage battery. Exemplarily, when the vehicle is a fuel vehicle, the voltage regulating module can be integrated into the vehicle's power generation system. For example, the generator can supply power to the low-voltage electrical devices in the low-voltage system through the voltage regulating module, or charge the low-voltage battery.

[0047] In one embodiment, the voltage regulating module can be controlled by the main control module to output a first charging voltage to charge the low-voltage battery. In one embodiment, the main control module may include a vehicle controller. As the central control unit of the electric vehicle, the vehicle controller is the core of the entire control system and also the regulation center of each subsystem. It can be used to collect and analyze the battery state, and after making corresponding judgments, monitor the operation of the lower-level components (such as the voltage regulating module in this embodiment).

[0048] When the vehicle is in a parking scenario, referring to Figure 1 , the charging method may include step S1: detecting the output voltage of the low-voltage battery; and / or step S2: detecting whether the power battery is in a charging state. When the output voltage of the low-voltage battery is lower than the set value, and / or when the power battery is in a charging state, then step S3 is entered: controlling the voltage regulating module to output a second charging voltage to charge the low-voltage battery. Among them, the first charging voltage is less than the second charging voltage.

[0049] Among them, the "parking scenario" means that the user is not in the vehicle and there is no need to use the vehicle. In this scenario, the vehicle is in a stationary state, and the vehicle cannot directly supply power to low-voltage electrical devices such as lights, wipers, and cigarette lighters in the low-voltage system through a fuel generator or a power battery. The low-voltage electrical devices can be powered by the low-voltage battery. The low-voltage battery may be discharged and in a depleted state, and at this time, the low-voltage battery needs to be replenished. In this embodiment, the replenishment of the low-voltage battery can be divided into two replenishment scenarios, and in these two replenishment scenarios, the vehicle is also in a powered-on state.

[0050] In a replenishment scenario provided by one embodiment, referring to Figure 1, the output voltage of the low-voltage battery can be detected. Exemplarily, the output voltage of the low-voltage battery can be continuously detected in real time, or the output voltage of the low-voltage battery can be detected periodically. In one embodiment, the output voltage of the low-voltage battery can be detected by the aforementioned voltage sensor. Exemplarily, the voltage sensor can be disposed on the low-voltage battery and can be electrically connected to the main control module. The voltage sensor can transmit the collected output voltage signal to the main control module, and the main control module can analyze and judge the output voltage signal. When the main control module determines that the output voltage is lower than the set value, the main control module can control the voltage regulation module to output a second charging voltage to charge the low-voltage battery. Wherein, the "set value" refers to the critical value when the low-voltage battery is discharged, and this critical value can be preset in the main control module. Wherein, the second charging voltage is greater than the first charging voltage. It can be understood that the larger the charging voltage, the faster the charging speed of the low-voltage battery and the more obvious the desulfurization effect. That is to say, by raising the first charging voltage to the second charging voltage, rapid charging and desulfurization of the low-voltage battery can be achieved through the relatively larger second charging voltage. In the in-vehicle scenario, the voltage regulation module can still be used to provide electrical energy to the low-voltage electrical equipment with a relatively small first charging voltage, avoiding an excessive working voltage of the low-voltage system and resulting in increased power consumption.

[0051] Thus, according to the output voltage of the low-voltage battery, when the low-voltage battery needs to be charged, the charging voltage can be appropriately raised through the voltage regulation module, thereby realizing rapid charging and desulfurization of the low-voltage battery. In the in-vehicle scenario, the voltage regulation module can output a relatively small first charging voltage to supply power to the low-voltage electrical equipment, thus taking into account both the requirements of rapid charging and desulfurization of the low-voltage battery and the demand for low power consumption of the whole vehicle.

[0052] In the charging scenario provided by another embodiment, refer to Figure 1, for an electric vehicle, it is possible to detect whether the power battery is in a charging state. Among them, the power battery can be electrically connected to a charging device such as a charging pile outside the vehicle to achieve charging. For example, a charging gun can be used to connect the power battery and the charging pile. Exemplarily, a sensor can be provided on the charging gun, and this sensor can be used to detect the connection state between the charging gun and the charging pile. When the charging gun is inserted into the charging pile, the sensor on the charging gun can send a signal to the main control module, and the main control module can analyze from the signal transmitted by the sensor that the power battery is in a charging state. At this time, the main control module can control the voltage regulating module to output a second charging voltage to charge the low-voltage battery. Similarly, this second charging voltage is greater than the first charging voltage. By raising the first charging voltage to the second charging voltage, rapid charging and desulfurization of the low-voltage battery can be achieved with a relatively larger second charging voltage. At the same time, during the process of charging the power battery through the charging gun and supplying power to the low-voltage battery by the power battery, the power battery also supplies power to the low-voltage system. At this time, the charging voltage of the power battery to the low-voltage battery and the power supply voltage to the low-voltage system are raised from the first charging voltage to the second charging voltage. Although the relatively high second charging voltage will cause a relatively large power consumption in the low-voltage system, due to the continuous charging of the power battery, the amount of electricity charged into the power battery per unit time is greater than the amount of electricity consumed by the power battery per unit time. Therefore, the stored electricity of the power battery can maintain a net increase state, so that the excessive power consumption of the low-voltage system will not affect the endurance of the power battery. In addition, in the vehicle usage scenario, it is still possible to use the voltage regulating module to provide electrical energy to low-voltage electrical devices with a relatively small first charging voltage, avoiding an excessive working voltage of the low-voltage system that would cause an increase in power consumption.

[0053] Thus, in the parking scenario, in the above two different charging scenarios, the first charging voltage can be raised to the second charging voltage, and rapid charging and desulfurization of the low-voltage battery can be achieved with a relatively larger second charging voltage. And in the vehicle usage scenario, it is still possible to use the voltage regulating module to provide electrical energy to low-voltage electrical devices with a relatively small first charging voltage, avoiding an excessive working voltage of the low-voltage system that would cause an increase in power consumption, thereby taking into account both the rapid charging and desulfurization requirements of the low-voltage battery and the requirement of low power consumption of the entire vehicle.

[0054] In one embodiment, both the first charging voltage and the second charging voltage can be between 12V and 16V. Within this voltage range, normal operation of the low-voltage electrical devices of the entire vehicle can be achieved, and rapid charging and desulfurization of the low-voltage battery can also be achieved.

[0055] In one embodiment, the first charging voltage can be between 14.15V and 14.25V. As described above, the first charging voltage can be consistent with the operating voltage of the low-voltage system. That is, in the in-vehicle scenario, either the fuel generator or the power battery can provide a constant voltage, which can simultaneously charge the low-voltage battery and supply power to the low-voltage system. Thus, by making the first charging voltage between 14.15V and 14.25V, while charging the low-voltage battery, it can ensure the normal operation of the low-voltage electrical devices in the low-voltage system. In one embodiment, the first charging voltage can be 14.15V, 14.18V, 14.2V, 14.23V, 14.25V. When the first charging voltage is these voltage values, it can ensure the normal operation of the low-voltage electrical devices in the low-voltage system while charging the low-voltage battery.

[0056] In one embodiment, the second charging voltage can be between 14.35V and 14.45V. The second charging voltage is the voltage after raising the first charging voltage. By making the second charging voltage between 14.35V and 14.45V, rapid charging and desulfurization of the low-voltage battery can be achieved. In one embodiment, the second charging voltage can be 14.35V, 14.38V, 14.4V, 14.43V, 14.45V. When the second charging voltage is these voltage values, rapid charging and desulfurization of the low-voltage battery can be achieved.

[0057] In one embodiment, Figure 2 is a flowchart of a charging method provided in another embodiment of the present application. Referring to Figure 2 , when the vehicle is in the parking scenario, the method further includes:

[0058] Step S4a: Detect the health of the low-voltage battery. If the health is less than the first set value, go to step S5a.

[0059] Step S5a: Control the voltage regulating module to output a third charging voltage to charge the low-voltage battery; the third charging voltage is greater than the first charging voltage.

[0060] Among them, the health can reflect the health status of the low-voltage battery. According to the health of the low-voltage battery, the voltage value after raising the first charging voltage can be comprehensively determined, so that the raised voltage value can take into account both the rapid charging and desulfurization of the low-voltage battery and the low power consumption of the whole vehicle.

[0061] In one embodiment, Figure 3 is a schematic diagram of adjusting the charging voltage according to the health in the present application. Referring to Figure 3, the health degree may include the maximum charging capacity, which may characterize the upper limit of the charging power of the low-voltage battery. Exemplarily, when the low-voltage battery has a better health degree, the maximum charging capacity of the low-voltage battery may be 90% - 100%. When the low-voltage battery has a general health degree, its maximum charging capacity may be 60% - 90%, that is, the maximum charging capacity of the low-voltage battery decreases. When the low-voltage battery has a poor health degree, its maximum charging capacity may be below 60%, that is, the maximum capacity of the low-voltage battery to store electrical energy decreases significantly. Exemplarily, when the health degree is the maximum charging capacity, the aforementioned first set value may be set according to the sulfation state of the low-voltage battery. For example, the first set value may be 60%. Among them, when the health degree of the low-voltage battery deteriorates, the sulfation problem of the low-voltage battery is serious, and a relatively large charging voltage is required to achieve effective desulfation. Therefore, in the aforementioned two charging scenarios, if it is detected that the health degree of the low-voltage battery deteriorates, for example, when the health degree is less than the first set value, the voltage regulation module can be controlled by the main control module to raise the first charging voltage to the third charging voltage, so as to achieve rapid charging and desulfation of the low-voltage battery through a relatively large charging voltage.

[0062] It should be noted that when the health degree of the low-voltage battery is different, the corresponding third charging voltage may also be different. Taking the health degree as the maximum charging capacity as an example, when it is detected that the maximum charging capacity of the low-voltage battery is between 90% - 100%, the low-voltage battery has a better health degree, and the sulfation problem of the low-voltage battery is not serious, or even the low-voltage battery has no sulfation problem. At this time, the first charging voltage can be raised to the third charging voltage value C, and the lifting amplitude is small. For the convenience of explanation, taking the first charging voltage as 14.2V as an example, the third charging voltage value C can be 14.35V, and the lifting amplitude is 0.15V. That is to say, by slightly raising the voltage, the requirements of rapid charging and low vehicle power consumption can be taken into account. When it is detected that the maximum charging capacity of the low-voltage battery is between 60% - 90%, the low-voltage battery has a general health degree, and there is a certain sulfation problem with the low-voltage battery. At this time, the first charging voltage can be raised to the third charging voltage value B, and the third charging voltage value B can be greater than the third charging voltage value C. For example, the third charging voltage value B can be 14.4V. By raising the first charging voltage to the larger third charging voltage value B, the requirements of rapid charging, desulfation and low vehicle power consumption can be taken into account at the same time. When it is detected that the maximum charging capacity of the low-voltage battery is less than 60%, the low-voltage battery has a poor health degree, and there is a serious sulfation problem with the low-voltage battery. At this time, the first charging voltage can be raised to the third charging voltage value A, and the third charging voltage value A can be greater than the third charging voltage value B and the third charging voltage value C. That is to say, by raising the first charging voltage to the larger third charging voltage value C, the serious sulfation problem of the low-voltage battery can be solved, and the requirements of rapid charging and low vehicle power consumption can be taken into account at the same time.

[0063] In one embodiment, Figure 4 This is another schematic diagram of adjusting the charging voltage according to the health degree of the present application. Referring to Figure 4 , the health degree may further include the maximum charging current, and the maximum charging current may represent the maximum value that the low-voltage battery can accept for the current under specific voltage conditions. Exemplarily, when the low-voltage battery has a better health degree, the maximum charging current that the low-voltage battery can accept may be 5A to 10A. When the low-voltage battery has an average health degree, the maximum charging current that it can accept may be 1A to 5A. When the low-voltage battery has a poor health degree, the maximum charging current that it can accept may be less than 1A. Exemplarily, when the health degree is the maximum charging current, the foregoing first set value may be set according to the sulfation state of the low-voltage battery. For example, the first set value may be 1A. When the health degree of the low-voltage battery deteriorates, for example, when the maximum charging current that the low-voltage battery can accept is less than 1A, the sulfation problem of the low-voltage battery is serious. At this time, the main control module can control the voltage regulation module to raise the first charging voltage to the third charging voltage, so as to realize rapid charging and desulfation of the low-voltage battery through a relatively large charging voltage.

[0064] As described above, when the health degrees of the low-voltage batteries are different, the corresponding third charging voltages may also be different. Taking the maximum charging current as the health degree as an example, when it is detected that the maximum charging current of the low-voltage battery is between 5A and 10A, the low-voltage battery has a better health degree, and the sulfation problem of the low-voltage battery is not serious, or even the low-voltage battery has no sulfation problem. At this time, the first charging voltage can be raised to the third charging voltage value F, and the lifting amplitude is small. For the convenience of description, taking the first charging voltage as 14.18V as an example, the third charging voltage value F may be 14.38V, and the lifting amplitude is 0.20V. That is to say, by slightly raising the voltage, the requirements of rapid charging and low power consumption of the whole vehicle can be taken into account. When it is detected that the maximum charging current of the low-voltage battery is between 1A and 5A, the low-voltage battery has an average health degree, and there is a certain sulfation problem with the low-voltage battery. At this time, the first charging voltage can be raised to the third charging voltage value E, and the third charging voltage value E may be greater than the third charging voltage value F. For example, the third charging voltage value E may be 14.42V. By raising the first charging voltage to the larger third charging voltage value E, the requirements of rapid charging, desulfation, and low power consumption of the whole vehicle can be taken into account at the same time. When it is detected that the maximum charging current of the low-voltage battery is less than 1A, the low-voltage battery has a poor health degree, and there is a serious sulfation problem with the low-voltage battery. At this time, the first charging voltage can be raised to the third charging voltage value D, and the third charging voltage value D may be greater than the third charging voltage value E and the third charging voltage value F. That is to say, by raising the first charging voltage to the larger third charging voltage value D, the serious sulfation problem of the low-voltage battery can be solved, and the requirements of rapid charging and low power consumption of the whole vehicle can be taken into account at the same time.

[0065] In addition, in some other embodiments, if it is detected that the low-voltage battery has a better health condition, for example, the low-voltage battery has no sulfation problem or only has a slight sulfation problem, the first charging voltage can also be adjusted to a relatively low charging voltage value. For example, when the first charging voltage is 14.3V, the first charging voltage of 14.4V can be adjusted to a lower 14.35V when the low-voltage battery has a better health condition, so that the vehicle power consumption can be reduced while ensuring high replenishment efficiency.

[0066] In one embodiment, in each of the above-mentioned replenishment scenarios, the first charging voltage can be first raised to a second charging voltage by a voltage regulating module to charge the low-voltage battery. Among them, the second charging voltage can solve most of the sulfation problems of the low-voltage battery, that is, the second charging voltage can correspond to the average sulfation degree of the low-voltage battery. Then, the health condition of the low-voltage battery can be further detected, and the second charging voltage can be dynamically adjusted according to the health condition. Exemplarily, when the health condition is poor, the sulfation degree of the low-voltage battery is lower than the aforementioned average sulfation degree, and the second charging voltage cannot effectively desulfate. At this time, the second charging voltage can be further adjusted to a higher third charging voltage by the voltage regulating module. For example, after raising the first charging voltage of 14.2V to the second charging voltage of 14.4V, the second charging voltage of 14.4V can be further raised to the third charging voltage of 14.45V, so that the charging voltage of the low-voltage battery can be accurately matched with the sulfation degree to achieve effective desulfation.

[0067] Of course, in some other embodiments, after raising the first charging voltage to the second charging voltage, if it is detected that the health condition is good, a relatively large charging voltage may not be required for desulfation. At this time, the second charging voltage can be further adjusted to a relatively low third charging voltage by the voltage regulating module. For example, after raising the first charging voltage of 14.2V to the second charging voltage of 14.4V, the second charging voltage of 14.4V can be further reduced to the third charging voltage of 14.35V, so that the vehicle low power consumption can be taken into account while ensuring efficient replenishment.

[0068] In some embodiments, the health degree may also include the maximum charge capacity and the maximum charge current. By comprehensively considering the maximum charge capacity and the maximum charge current, the first charging voltage is raised to a matching voltage value to achieve the effects of fast charge replenishment and desulfurization. In addition, the health degree may also include other parameters of the low-voltage battery, and can also be comprehensively quantified according to the corresponding parameters, that is, the result after comprehensive consideration of each parameter can be represented by a quantified value, and the quality of the health degree can be characterized by this result. For example, after comprehensively quantifying parameters such as the maximum charge capacity and the maximum charge current, multiple numerical intervals can be divided for the health degree. For example, in the interval of 80-100, it can represent good health degree; in the interval of 50-80, it can represent general health degree; in the interval less than 50, it can represent poor health degree. The embodiments do not limit the specific quantification method of the health degree.

[0069] In some embodiments, Figure 5 is a flowchart of a charging method provided by another embodiment of the present application. Refer to Figure 5 , when the vehicle is in a parking scenario, the charging method further includes:

[0070] Step S4b: Detect the remaining battery power (State Of Charge, SOC) of the low-voltage battery. If the remaining battery power is less than the second set value, go to step S5b.

[0071] Step S5b: Detect the health degree of the low-voltage battery. If the health degree is less than the third set value, go to step S6b.

[0072] Step S6b: Control the voltage regulating module to output a fourth charging voltage to charge the low-voltage battery; the fourth charging voltage is greater than the first charging voltage.

[0073] Among them, as described above, the health degree can reflect the health state of the low-voltage battery, and the health degree can include parameters such as the maximum charge capacity and / or the maximum charge current. The remaining battery power can characterize the remaining battery power during the use of the low-voltage battery. By comprehensively considering the remaining battery power and the health degree of the low-voltage battery, the voltage value after raising the first charging voltage can be more accurately determined according to the state of the low-voltage battery, so that the raised voltage value can take into account both the fast charge replenishment and desulfurization of the low-voltage battery and the low power consumption of the whole vehicle. Among them, the second set value can be set according to parameters such as the charging efficiency of the low-voltage battery. Exemplarily, when the remaining battery power of the low-voltage battery is greater than the second set value, a smaller charging voltage is required to achieve fast charge replenishment. At this time, the first charging voltage can be raised by a smaller voltage amplitude. When the remaining battery power of the low-voltage battery is less than the second set value, the low-voltage battery has a relatively serious power shortage. At this time, the first charging voltage can be raised by a larger voltage amplitude to achieve fast charge replenishment through a larger fourth charging voltage.

[0074] Exemplarily, Figure 6 FIG. is a schematic diagram of the present application for adjusting the charging voltage according to the remaining battery power and health status. Referring to Figure 6 , in the main control module, multiple power ranges can be preset for the remaining power of the low-voltage battery. For example, when the remaining power is between 80% and 90%, the low-voltage battery has relatively more remaining power; when the remaining power is between 40% and 80%, the low-voltage battery has general remaining power; when the remaining power is between 1% and 40%, the low-voltage battery has relatively less remaining power. Of course, more power ranges can also be preset for the remaining power, and this can be set according to the actual usage of the low-voltage battery.

[0075] After detecting that the remaining power of the low-voltage battery is in the corresponding range, the health status of the low-voltage battery can be further detected, and the charging voltage to be adjusted can be determined according to the remaining power and health status of the low-voltage battery. Exemplarily, referring to Figure 6 , when it is detected that the remaining power of the low-voltage battery is between 40% and 80%, the health status can be further detected. In this embodiment, taking the health status including the maximum charging current and the maximum charging current including three ranges of 5A - 10A, 1A - 5A, and less than 1A as an example for illustration. When it is detected that the maximum charging current of the low-voltage battery is between 5A and 10A, the low-voltage battery has better health status, and the voltage regulation module can be controlled to raise the first charging voltage to the third charging voltage value J2, which can balance the requirements of fast charging and low power consumption of the whole vehicle. When it is detected that the maximum charging current of the low-voltage battery is between 1A and 5A, the low-voltage battery has general health status, and there is a certain sulfation problem with the low-voltage battery. At this time, the first charging voltage can be raised to the third charging voltage value H2, and the third charging voltage value H2 can be greater than the third charging voltage value J2, so as to balance the requirements of fast charging, desulfation, and low power consumption of the whole vehicle at the same time. When it is detected that the maximum charging current of the low-voltage battery is less than 1A, the low-voltage battery has poor health status, and there is a serious sulfation problem with the low-voltage battery. At this time, the first charging voltage can be raised to the third charging voltage value G2, and the third charging voltage value G2 can be greater than the third charging voltage value H2 and the third charging voltage value J2. That is to say, by raising the first charging voltage to a larger third charging voltage value G2, the serious sulfation problem of the low-voltage battery can be solved, and the requirements of fast charging and low power consumption of the whole vehicle can be balanced at the same time. Among them, when different remaining power ranges and different health status ranges are considered comprehensively, a better third charging voltage value can be adjusted accordingly, so that the charging voltage to be adjusted can be accurately determined according to different states of the low-voltage battery, and thus the requirements of fast charging, desulfation, and low power consumption of the whole vehicle can be better balanced. In some other embodiments, the remaining power and the maximum charging power of the low-voltage battery can also be considered comprehensively to adjust the first charging voltage, which will not be elaborated here.

[0076] In addition, in some other embodiments, when the low-voltage battery has a large amount of remaining power and is in good health, there is no need to raise the first charging voltage. For example, when it is detected that the remaining power of the low-voltage battery is between 80% and 90%, and the maximum charging current is between 5A and 10A, the low-voltage battery stores enough power and has a good health. At this time, the first charging voltage can be appropriately reduced to ensure efficient charging while taking into account the low power consumption of the entire vehicle. Of course, in some embodiments, the first charging voltage can also be maintained unchanged.

[0077] In one embodiment, Figure 7 A flowchart of a charging method provided in another embodiment of the present application, referring to Figure 7 In each of the aforementioned power replenishment scenarios, it may also include detecting the charging current of the low-voltage battery. If the charging current is less than the fourth set value, the voltage regulation module is controlled to output the fifth charging voltage to charge the low-voltage battery; the fifth charging voltage is greater than the first charging voltage. Among them, the charging current is the actual charging current during the charging process of the low-voltage battery. If the charging current is too large, it will cause greater power consumption. Therefore, the fourth set value of the charging current can be preset in the main control module to adjust the charging voltage according to the actual charging current value and the fourth set value, so that the charging voltage can take into account efficient power replenishment, desulfurization and low power consumption of the whole vehicle at the same time.

[0078] Exemplarily, multiple charging current intervals can be preset in the main control module. For example, the current intervals can include three intervals: 3A to 6A, 1A to 3A, and less than 1A. Of course, in other embodiments, the number of current intervals can also be other numbers. This embodiment only takes the current intervals including the above three intervals as an example for explanation. Figure 7, when only considering the state of health of the low-voltage battery, after detecting the state of health of the low-voltage battery, the first charging voltage can be adjusted to the third charging voltage, and then, the actual charging current of the low-voltage battery can be further detected. Taking the state of health as the maximum charging capacity, and assuming that there are three intervals for the maximum charging capacity preset as 90% - 100%, 60% - 90%, and less than 60% as an example, when the detected maximum charging capacity is between 60% - 90% and the detected actual charging current is between 3A - 6A, the charging current is relatively large, which will bring a relatively large power loss to the low-voltage system. At this time, while taking into account the state of health, the voltage regulation module can be controlled to reduce the third charging voltage value B to the fifth charging voltage value N2, and the fifth charging voltage value N2 is still greater than the first charging voltage, so as to simultaneously take into account efficient power replenishment, desulfurization, and low vehicle power during the charging process of the low-voltage battery with the fifth charging voltage value N2. When the detected actual charging current is between 1A - 3A, the charging current may not bring a relatively large power loss, and at the same time, the charging efficiency can be guaranteed. Therefore, in this charging current interval, the third charging voltage value B can remain unchanged, or the third charging voltage value B can also be slightly increased or decreased to be adjusted to the fifth charging voltage value M2. When the detected actual charging current is less than 1A, the charging current is relatively small, and it is difficult to achieve efficient power replenishment. At this time, while taking into account the state of health, the voltage regulation module can be controlled to raise the third charging voltage value B to the fifth charging voltage value K2 to increase the power replenishment speed of the low-voltage battery with the fifth charging voltage value K2. Similarly, for the cases where the maximum charging capacity is less than 60% and between 90% - 100%, the third charging voltage can also be adjusted in combination with the charging current in the above manner, which will not be elaborated here.

[0079] Figure 8 is a schematic structural diagram of the charging system provided by the embodiment of the present application. Refer to Figure 8 , the embodiment of the present application also provides a charging system, which includes a main control module, a voltage regulation module, and a low-voltage battery. Among them, the main control module may include the aforementioned vehicle controller. As the central control unit of the electric vehicle, the vehicle controller is the core of the entire control system and the regulation center of each subsystem. It can be used to collect and analyze the battery state, and after making corresponding judgments, monitor the operation of the lower-level components (such as the voltage regulation module in this embodiment). The voltage regulation module may be the aforementioned DC-DC converter (DC-DC converter), and the DC-DC converter can also be called a DC chopper, which is used to convert a fixed DC voltage into a variable DC voltage. The low-voltage battery may be the aforementioned storage battery (such as a lead-acid battery) or a lithium battery, etc., which is used to store electrical energy. In this embodiment, the low-voltage battery is taken as a lead-acid battery for illustration.

[0080] The main control module is respectively connected to the voltage regulating module and the low-voltage battery, and is used to control the voltage regulating module to output a first charging voltage to charge the low-voltage battery when the vehicle is in the driving scenario. The main control module is also used to detect the output voltage of the low-voltage battery and / or detect whether the power battery is in the charging state when the vehicle is in the parking scenario. When the output voltage of the low-voltage battery is lower than the set value and / or when the power battery is in the charging state, the main control module can control the voltage regulating module to output a second charging voltage to charge the low-voltage battery, where the first charging voltage is less than the second charging voltage.

[0081] Among them, this charging system can be used to implement the charging method provided in any embodiment of the present application. This charging system has technical effects similar to those of the aforementioned charging method, and will not be elaborated here in this embodiment.

[0082] In one embodiment, when the vehicle is an electric vehicle, this charging system may further include a power battery. The power battery can be connected to the main control module, and the main control module can control the power battery to discharge. The power battery is connected to the low-voltage battery through the voltage regulating module, so that the low-voltage battery can be charged by the power battery.

[0083] An embodiment of the present application also provides a storage medium, which includes a stored application program. The application program executes the charging method for the vehicle low-voltage battery provided in any embodiment of the present application.

[0084] The above are only the preferred embodiments of the present application and are not used to limit the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A method for charging a low-voltage battery of a vehicle, characterized in that: include: When the vehicle is in a vehicle use scenario, controlling the voltage regulating module to output a first charging voltage to charge the low-voltage battery; When the vehicle is in a parking scenario, detecting the output voltage of the low-voltage battery, and / or detecting whether the power battery is in a charging state; When the output voltage of the low-voltage battery is lower than a set value, and / or when the power battery is in a charging state, the voltage regulating module is controlled to output a second charging voltage to charge the low-voltage battery; Wherein, the first charging voltage is lower than the second charging voltage.

2. The method for charging a vehicle low-voltage battery according to claim 1, characterized in that: When the vehicle is in a parking scenario, the method further includes: Detecting the health of the low-voltage battery; If the health level is less than a first set value, controlling the voltage regulating module to output a third charging voltage to charge the low-voltage battery; The third charging voltage is greater than the first charging voltage.

3. The method for charging a vehicle low-voltage battery according to claim 2, characterized in that: The third charging voltage is greater than the second charging voltage.

4. The method for charging a vehicle low-voltage battery according to claim 2 or 3, characterized in that: The health status includes a maximum charging capacity and / or a maximum charging current.

5. The method for charging a vehicle low-voltage battery according to claim 1, characterized in that: When the vehicle is in a parking scenario, the method further includes: Detecting the remaining power of the low-voltage battery; If the remaining power is less than a second set value, detecting the health of the low-voltage battery; If the health level is less than a third set value, controlling the voltage regulating module to output a fourth charging voltage to charge the low-voltage battery; The fourth charging voltage is greater than the first charging voltage.

6. The method for charging a vehicle low-voltage battery according to claim 2 or 5, characterized in that: The method further comprises: Detecting the charging current, and if the charging current is less than a fourth set value, controlling the voltage regulating module to output a fifth charging voltage to charge the low-voltage battery; The fifth charging voltage is greater than the first charging voltage.

7. The method for charging a low-voltage battery of a vehicle according to any one of claims 1 to 6, characterized in that: The first charging voltage and the second charging voltage are both between 12V and 16V.

8. The method for charging a vehicle low-voltage battery according to any one of claims 1 to 7, characterized in that: The first charging voltage is between 14.15V and 14.25V, and the second charging voltage is between 14.35V and 14.45V.

9. A charging system, characterized in that: It includes a main control module, a voltage regulating module and a low-voltage battery, among which: The main control module is connected to the voltage regulating module and the low-voltage battery respectively, and is used to control the voltage regulating module to output a first charging voltage to charge the low-voltage battery when the vehicle is in a vehicle use scenario; The main control module is also used to detect the output voltage of the low-voltage battery when the vehicle is in a parking scenario, and / or to detect whether the power battery is in a charging state; when the output voltage of the low-voltage battery is lower than a set value, and / or when the power battery is in a charging state, the voltage regulating module is controlled to output a second charging voltage to charge the low-voltage battery; Wherein, the first charging voltage is lower than the second charging voltage.

10. The charging system according to claim 9, characterized in that: It also includes a power battery, which is connected to the main control module, and the power battery is connected to the low-voltage battery through the voltage regulating module.

11. A storage medium, characterized in that: The storage medium includes a stored application program, and the application program executes the vehicle low-voltage battery charging method according to any one of claims 1 to 8.

12. A vehicle, characterized in that: It comprises the charging system according to claim 9 or 10 and the storage medium according to claim 11.

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