Charging method of lead-acid storage battery, terminal and storage medium

Abstract

The invention discloses a charging method of a lead-acid storage battery, a terminal and a storage medium, and the charging method comprises the steps: determining the error calibration voltage of a vehicle component through the output voltage of a charging and discharging unit during working and the target voltage of the lead-acid storage battery during working of the charging and discharging unit, and enabling the target voltage to be measured by an electronic control unit; determining the current actual voltage of the lead-acid storage battery by using the target voltage and the error calibration voltage; determining the current electric quantity of the lead-acid storage battery from the voltage-current-electric quantity characteristic curve by utilizing the current actual voltage and the current current of the lead-acid storage battery; and according to the current electric quantity, whether the power battery of the vehicle carries out charging operation on the lead-acid storage battery is judged. According to the scheme, the electric quantity of the lead-acid storage battery can be more accurately determined, whether the power battery is used for charging the lead-acid storage battery or not is judged, and the charging reasonability is improved.

Description

Technical Field

[0001] This application relates to the technical field of battery charging, and particularly to a charging method, a terminal, and a storage medium for a lead-acid battery. Background Art

[0002] An electric vehicle refers to a vehicle powered by an on-vehicle power source and driven by an electric motor. Electric vehicles include hybrid electric vehicles and pure electric vehicles. Generally, the low-voltage system of an electric vehicle is powered by a lead-acid battery. When the vehicle is parked for a long time, the static current of the low-voltage system continues to consume the power of the lead-acid battery, which may cause the lead-acid battery to lack sufficient electrical energy. A lead-acid battery lacking sufficient electrical energy makes the vehicle unable to power on at high voltage and thus unable to start.

[0003] To ensure that the lead-acid battery has sufficient electrical energy, in related technologies, the lead-acid battery is often charged for a certain period of time (such as 20 minutes, 2 hours) every certain period of time (such as 12 hours, 24 hours). This method may cause overcharging or undercharging of the lead-acid battery, greatly shortening the service life of the lead-acid battery. Summary of the Invention

[0004] This application provides a charging method, a terminal, and a storage medium for a lead-acid battery.

[0005] One technical solution adopted by this application is to provide a charging method for a lead-acid battery, the charging method including:

[0006] Using the output voltage when the charge and discharge unit works and the target voltage of the lead-acid battery when the charge and discharge unit works, determining the error calibration voltage of vehicle components, wherein the target voltage is measured by an electronic control unit;

[0007] Using the target voltage and the error calibration voltage, determining the current actual voltage of the lead-acid battery;

[0008] Using the current actual voltage and the current current of the lead-acid battery, determining the current power of the lead-acid battery from the voltage-current-power characteristic curve;

[0009] Judging whether the power battery of the vehicle performs a charging operation on the lead-acid battery according to the current power.

[0010] Optionally, using the target voltage and the error calibration voltage to determine the current actual voltage of the lead-acid battery includes:

[0011] Obtaining the ambient temperature of the lead-acid battery;

[0012] Determining the temperature calibration voltage according to the ambient temperature;

[0013] Determine the current actual voltage of the lead-acid battery by using the target voltage, error calibration voltage, and temperature calibration voltage.

[0014] Optionally, determine the temperature calibration voltage according to the ambient temperature, including:

[0015] In response to the ambient temperature being less than the reference temperature, calculate the temperature difference between the reference temperature and the ambient temperature;

[0016] Use the temperature difference to determine the temperature calibration voltage.

[0017] Optionally, determine the temperature calibration voltage according to the ambient temperature, and further include:

[0018] In response to the ambient temperature being greater than or equal to the reference temperature, determine that the temperature calibration voltage is zero.

[0019] Optionally, before the step of determining the current power of the lead-acid battery from the voltage-current-power characteristic curve by using the current actual voltage and the current of the lead-acid battery, include:

[0020] Obtain the detected current detected by the electronic control unit for the lead-acid battery;

[0021] Determine the calibration current based on the operating state of the vehicle;

[0022] Use the detected current and the calibration current to determine the current current.

[0023] Optionally, determine the calibration current based on the operating state of the vehicle, including:

[0024] In response to the vehicle being in the powered-on state, use the electronic control unit to obtain the sum of the operating currents of all target loads powered by the lead-acid battery;

[0025] Take the sum of the operating currents as the calibration current.

[0026] Optionally, determine the calibration current based on the operating state of the vehicle, and further include:

[0027] In response to the vehicle being in the powered-off state, use the electronic control unit to obtain the static operating current of all target loads;

[0028] Take the static operating current as the calibration current.

[0029] Optionally, determine whether the power battery of the vehicle performs a charging operation on the lead-acid battery according to the current power, including:

[0030] In response to the current power being less than the preset power, use the power battery to perform a charging operation on the lead-acid battery.

[0031] Another technical solution adopted by this application is to provide a terminal device, which includes a memory and a processor connected to the memory;

[0032] Among them, the memory is used to store program data, and the processor is used to execute the program data to implement the charging method of the lead-acid battery as described above.

[0033] Another technical solution adopted by this application is to provide a computer storage medium, which is used to store program data. When the program data is executed by a computer, it is used to implement the charging method of the lead-acid battery as described above.

[0034] The beneficial effects of this application are as follows: Using the output voltage when the charge and discharge unit works and the target voltage of the lead-acid battery when the charge and discharge unit works, the error calibration voltage of the vehicle components is determined. Then, using the error calibration voltage, the target voltage is calibrated to determine the current actual voltage of the lead-acid battery. Further, using the current actual voltage and the current of the lead-acid battery, the current power of the lead-acid battery is determined from the voltage-current-power characteristic curve. Then, according to the current power, it is judged whether to use the power battery of the vehicle to charge the lead-acid battery. The charging method of the lead-acid battery provided by this application calibrates the target voltage to more accurately obtain the current actual voltage of the lead-acid battery, then more accurately determines the current power of the lead-acid battery according to the relationship between voltage, current and power, and then judges whether to charge the lead-acid battery based on the power of the lead-acid battery. In this way, the charging rationality of the lead-acid battery is improved, the lead-acid battery is avoided from being undercharged or overcharged, and the service life of the lead-acid battery is extended. Description of the Drawings

[0035] In order to more clearly illustrate the technical solutions in the embodiments of this application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of this application. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0036] Figure 1 It is a schematic flowchart of an embodiment of the charging method of the lead-acid battery provided by this application;

[0037] Figure 2 It is a relational diagram of an embodiment of the voltage-current-power characteristic curve;

[0038] Figure 3 It is a schematic structural diagram of an embodiment of the battery charging device provided by this application;

[0039] Figure 4 It is a schematic structural diagram of an embodiment of the terminal device provided by this application;

[0040] Figure 5 It is a schematic structural diagram of an embodiment of a computer storage medium provided by the present application. Specific embodiments

[0041] Next, the technical solutions in the embodiments of the present application will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the scope of protection of the present application.

[0042] Specifically, please refer to Figure 1 , Figure 1 It is a schematic flowchart of an embodiment of a method for replenishing power of a lead-acid battery provided by the present application.

[0043] As Figure 1 shown, the method for replenishing power of the lead-acid battery in the embodiment of the present application may specifically include the following steps:

[0044] S1. Using the output voltage when the charge and discharge unit works and the target voltage of the lead-acid battery when the charge and discharge unit works, determine the error calibration voltage of the vehicle components.

[0045] Among them, the target voltage is measured by the electronic control unit.

[0046] The method for replenishing power of the lead-acid battery provided by the present application is mainly executed by a battery replenishing device. In some embodiments, the battery replenishing device may be the battery management system (BMS) itself corresponding to the lead-acid battery. In some embodiments, the battery replenishing device may also be a device associated with the battery management system. For example, the device may be a device for monitoring images, a user equipment (UE), a mobile device, a user terminal, a terminal, a cellular phone, a cordless phone, a personal digital assistant (PDA), a handheld device, a computing device, a vehicle-mounted device, a wearable device, and any one or more of products such as an autonomous vehicle, a robot, a security system, glasses or helmets for augmented reality or virtual reality. In some possible embodiments, the battery replenishing device may be an intelligent cockpit system. In some possible implementation manners, the method for replenishing power of the lead-acid battery may be implemented by a processor calling computer-readable instructions stored in a memory.

[0047] It should be noted that the method for charging the lead-acid battery provided in this application is mainly used for hybrid electric vehicles and pure electric vehicles, and cannot be used for internal combustion engine vehicles (ICEVs). Among them, hybrid electric vehicles can be plug-in hybrid electric vehicles (PHEVs), series hybrid electric vehicles, parallel hybrid electric vehicles, and series-parallel hybrid electric vehicles. It can be understood that power batteries for mainly driving the vehicle are provided in hybrid electric vehicles and pure electric vehicles.

[0048] Specifically, the battery charging device obtains the output voltage when the conversion and distribution unit (CDU) is working, and the electrical control unit (ECU) detects the target voltage when the conversion and distribution unit charges the lead-acid battery, and calculates the difference between the output voltage and the target voltage to obtain the error calibration voltage of the vehicle components.

[0049] Among them, the lead-acid battery is connected to the conversion and distribution unit. In the scenario where the lead-acid battery discharges, the conversion and distribution unit is used to step down the output voltage of the lead-acid battery to supply power to the loads in the vehicle. In the scenario where the lead-acid battery is charged, the conversion and distribution unit is used to step down the high voltage output by the power battery to charge the lead-acid battery.

[0050] Among them, the output voltage when the conversion and distribution unit (CDU) works is stable at 13.85V. Further, the target voltage is the voltage detected by the electrical control unit for the lead-acid battery when the conversion and distribution unit is working.

[0051] In some embodiments, the error calibration voltage satisfies the following relationship:

[0052] ΔV1=V op -V de

[0053] Among them, ΔV1 is the error calibration voltage, V op is the output voltage, V de is the target voltage.

[0054] It should be noted that the main function of the lead-acid battery is to supply power to the low-voltage loads in the vehicle. Exemplarily, the low-voltage loads can be loads with a supply voltage of 12V or a lower supply voltage, such as windshield wipers, vehicle lights, vehicle locks, window motors, or some vehicle sensors. Exemplarily, the vehicle sensors can be on-vehicle cameras or ultrasonic sensors, etc.

[0055] S2. Determine the current actual voltage of the lead-acid battery by using the target voltage and the error calibration voltage.

[0056] In some embodiments, the battery charging device calculates the sum of the target voltage and the error calibration voltage to obtain the current actual voltage.

[0057] Specifically, the current actual voltage of the lead-acid battery satisfies the following relationship:

[0058] V in = V de + ΔV1

[0059] where V in is the current actual voltage.

[0060] S3. Determine the current charge of the lead-acid battery from the voltage-current-charge characteristic curve by using the current actual voltage and the current current of the lead-acid battery.

[0061] It can be understood that the voltage-current-charge characteristic curve is obtained by pre-testing lead-acid batteries of the same model. In some embodiments, at 25 °C, for lead-acid batteries of the same model, at different charges, the operation of discharging for 10 s with different currents is performed to obtain the corresponding voltage values, thereby forming the voltage-current-charge characteristic curve.

[0062] Exemplarily, an embodiment of the voltage-current-charge characteristic curve is as Figure 2 shown, where Figure 2 the SOC (State of Charge) in Figure 2 refers to the remaining charge of the lead-acid battery. It can be seen from

[0063] that when the battery current is the same, the greater the battery voltage, the greater the corresponding battery charge; when the battery charge is the same, the greater the battery current, the smaller the battery voltage.

[0064] S4. Determine whether the power battery of the vehicle performs a charging operation on the lead-acid battery according to the current charge.

[0065] Exemplarily, the battery charging device determines whether the current charge is less than a certain threshold. If so, it is determined to use the power battery of the vehicle to charge the lead-acid battery.

[0066] In the related art, mainly at intervals of a period of time (such as 12h or 24h), the power battery is used to charge the lead-acid battery, and at the same time, a fixed charging time (such as 15min, 20min or 30min) is adopted. This method has the problems of frequent charging and unreasonable charging operation, resulting in energy waste, insufficient charging or overcharging of the power battery.

[0067] Different from the related art, this step determines whether to charge the lead-acid battery based on the current power of the lead-acid battery, avoiding the problem of overcharging the lead-acid battery and reducing the energy waste of the power battery.

[0068] In the above solution, the output voltage when the charge and discharge unit works is used to determine the error calibration voltage of the vehicle components with the target voltage of the lead-acid battery when the charge and discharge unit works. Then, the target voltage is calibrated using the error calibration voltage to determine the current actual voltage of the lead-acid battery. Further, using the current actual voltage and the current of the lead-acid battery, the current power of the lead-acid battery is determined from the voltage-current-power characteristic curve. Then, according to the current power, it is judged whether to use the power battery of the vehicle to charge the lead-acid battery. The charging method of the lead-acid battery provided by this application calibrates the target voltage to more accurately obtain the current actual voltage of the lead-acid battery, and then more accurately determines the current power of the lead-acid battery according to the relationship between voltage, current and power. Then, based on the power of the lead-acid battery, it is judged whether to charge the lead-acid battery. By the above method, the charging rationality of the lead-acid battery is improved, the lead-acid battery is avoided from being undercharged or overcharged, and the service life of the lead-acid battery is extended.

[0069] Another embodiment of the charging method of the lead-acid battery provided by this application may specifically include the following steps:

[0070] S11, using the output voltage when the charge and discharge unit works and the target voltage of the lead-acid battery when the charge and discharge unit works, determine the error calibration voltage of the vehicle components.

[0071] Among them, the target voltage is measured by the electronic control unit.

[0072] S12, obtain the ambient temperature of the lead-acid battery.

[0073] In some embodiments, the battery charging device uses a temperature sensor provided on the outer shell of the lead-acid battery to obtain the ambient temperature of the lead-acid battery.

[0074] S13, determine the temperature calibration voltage according to the ambient temperature.

[0075] In some embodiments, the temperature calibration voltage has a linear relationship with the ambient temperature. More specifically, the lower the ambient temperature, the greater the temperature calibration voltage.

[0076] It should be noted that when the temperature is low, the voltage of the lead-acid battery will decrease. Therefore, in this embodiment, the ambient temperature is used to determine the temperature calibration voltage, and then the voltage error calibration of the lead-acid battery is achieved.

[0077] S14. Use the target voltage, error calibration voltage, and temperature calibration voltage to determine the current actual voltage of the lead-acid battery.

[0078] In some embodiments, the battery charging device calculates the sum of the target voltage, error calibration voltage, and temperature calibration voltage to obtain the current actual voltage of the lead-acid battery.

[0079] S15. Use the current actual voltage and the current current of the lead-acid battery to determine the current power of the lead-acid battery from the voltage-current-power characteristic curve.

[0080] S16. According to the current power, determine whether the power battery of the vehicle performs a charging operation on the lead-acid battery.

[0081] In the above solution, the output voltage when the charging and discharging unit works is used to determine the error calibration voltage of the vehicle components with the target voltage of the lead-acid battery when the charging and discharging unit works. Then, the error calibration voltage is used to calibrate the target voltage to determine the current actual voltage of the lead-acid battery. Further, the current actual voltage and the current current of the lead-acid battery are used to determine the current power of the lead-acid battery from the voltage-current-power characteristic curve. Then, according to the current power, it is determined whether to use the power battery of the vehicle to charge the lead-acid battery. The charging method of the lead-acid battery provided by the present application calibrates the target voltage to more accurately obtain the current actual voltage of the lead-acid battery, then more accurately determines the current power of the lead-acid battery according to the relationship between voltage, current, and power, and then based on the power of the lead-acid battery, determines whether to charge the lead-acid battery. In this way, the charging rationality of the lead-acid battery is improved, the lead-acid battery is prevented from being undercharged or overcharged, and the service life of the lead-acid battery is extended.

[0082] Another embodiment of the charging method of the lead-acid battery provided by the present application may specifically include the following steps:

[0083] S21. Use the output voltage when the charging and discharging unit works to determine the error calibration voltage of the vehicle components with the target voltage of the lead-acid battery when the charging and discharging unit works.

[0084] Among them, the target voltage is measured by the electronic control unit.

[0085] S22. Obtain the ambient temperature of the lead-acid battery.

[0086] S23. In response to the ambient temperature being less than the reference temperature, calculate the temperature difference between the reference temperature and the ambient temperature.

[0087] In some embodiments, the reference temperature is 25 °C. Further, if the ambient temperature is less than the reference temperature, for every 10 °C decrease in the ambient temperature, the actual voltage of the battery decreases by 0.1 V.

[0088] In some embodiments, the battery charging compensation device calculates the difference between the reference temperature and the ambient temperature to obtain the temperature difference.

[0089] S24. Use the temperature difference to determine the temperature calibration voltage.

[0090] In some embodiments, the temperature calibration voltage satisfies the following relationship:

[0091] ΔV2 = ΔT / 100

[0092] where ΔV2 is the temperature calibration voltage and ΔT is the temperature difference.

[0093] S25. Use the target voltage, error calibration voltage, and temperature calibration voltage to determine the current actual voltage of the lead-acid battery.

[0094] S26. Use the current actual voltage and the current current of the lead-acid battery to determine the current power of the lead-acid battery from the voltage-current-power characteristic curve.

[0095] S27. According to the current power, determine whether the power battery of the vehicle performs a charging compensation operation on the lead-acid battery.

[0096] In the above solution, the error calibration voltage of the vehicle components is determined by using the output voltage when the charge and discharge unit is working and the target voltage of the lead-acid battery when the charge and discharge unit is working. Then, the target voltage is calibrated by using the error calibration voltage to determine the current actual voltage of the lead-acid battery. Further, the current power of the lead-acid battery is determined from the voltage-current-power characteristic curve by using the current actual voltage and the current current of the lead-acid battery. Then, according to the current power, it is determined whether to use the power battery of the vehicle to perform a charging compensation operation on the lead-acid battery. The charging compensation method for the lead-acid battery provided by this application can more accurately obtain the current actual voltage of the lead-acid battery by calibrating the target voltage, and then more accurately determine the current power of the lead-acid battery according to the relationship between voltage, current, and power. Then, based on the power of the lead-acid battery, it is determined whether to perform a charging compensation operation on the lead-acid battery. By the above method, the charging rationality of the lead-acid battery is improved, the lead-acid battery is avoided from being under-compensated or over-compensated, and the service life of the lead-acid battery is extended.

[0097] Another embodiment of the charging method for the lead-acid battery provided by this application may specifically include the following steps:

[0098] S31: Determine the error calibration voltage of the vehicle components by using the output voltage when the charge and discharge unit is operating and the target voltage of the lead-acid battery when the charge and discharge unit is operating.

[0099] Among them, the target voltage is measured by the electronic control unit.

[0100] S32: Obtain the ambient temperature of the lead-acid battery.

[0101] S33: In response to the ambient temperature being greater than or equal to the reference temperature, determine that the temperature calibration voltage is zero.

[0102] In some embodiments, in response to the ambient temperature being greater than or equal to the reference temperature, the battery charging device determines that the temperature calibration voltage is 0V.

[0103] In some embodiments, the reference temperature is 25°C. Further, when the ambient temperature is higher than the reference temperature, at this time, the influence of temperature on the battery voltage can be ignored.

[0104] S34: Determine the current actual voltage of the lead-acid battery by using the target voltage, the error calibration voltage, and the temperature calibration voltage.

[0105] S35: Determine the current power of the lead-acid battery from the voltage-current-power characteristic curve by using the current actual voltage and the current of the lead-acid battery.

[0106] S36: Determine whether the power battery of the vehicle performs a charging operation on the lead-acid battery according to the current power.

[0107] In the above solution, the error calibration voltage of the vehicle components is determined by using the output voltage when the charge and discharge unit is operating and the target voltage of the lead-acid battery when the charge and discharge unit is operating. Then, the target voltage is calibrated by using the error calibration voltage to determine the current actual voltage of the lead-acid battery. Further, the current power of the lead-acid battery is determined from the voltage-current-power characteristic curve by using the current actual voltage and the current of the lead-acid battery. Then, it is determined whether to use the power battery of the vehicle to charge the lead-acid battery according to the current power. The charging method for the lead-acid battery provided by this application calibrates the target voltage to more accurately obtain the current actual voltage of the lead-acid battery. Then, according to the relationship between voltage, current, and power, the current power of the lead-acid battery is more accurately determined. Then, based on the power of the lead-acid battery, it is determined whether to charge the lead-acid battery. By the above method, the charging rationality of the lead-acid battery is improved, the lead-acid battery is avoided from being undercharged or overcharged, and the service life of the lead-acid battery is extended.

[0108] Another embodiment of the charging method for the lead-acid battery provided by this application may specifically include the following steps:

[0109] S41. Determine the error calibration voltage of the vehicle components by using the output voltage when the charge and discharge unit is working and the target voltage of the lead-acid battery when the charge and discharge unit is working.

[0110] Among them, the target voltage is measured by the electronic control unit.

[0111] S42. Determine the current actual voltage of the lead-acid battery by using the target voltage and the error calibration voltage.

[0112] S43. Obtain the detection current detected by the electronic control unit for the lead-acid battery.

[0113] Specifically, the battery charging device obtains the detection current detected by the electronic control unit for the lead-acid battery.

[0114] S44. Determine the calibration current based on the operating state of the vehicle.

[0115] Specifically, the battery charging device determines the calibration current based on the operating state of the vehicle.

[0116] In some embodiments, the operating state of the vehicle includes the powered-on state or the powered-off state. Among them, the powered-on state means that the vehicle power system starts to work and provides the required electrical energy for the vehicle. The powered-off state means that the vehicle changes from the powered-on or working state to the powered-off state, and most of the vehicle's electronic systems and electrical equipment are turned off, stopping the operation and functions of the vehicle.

[0117] Furthermore, the battery charging device determines the calibration current according to whether the vehicle is in the powered-on state.

[0118] S45. Determine the current current by using the detection current and the calibration current.

[0119] In some embodiments, the battery charging device calculates the sum of the detection current and the calibration current to obtain the current current.

[0120] S46. Determine the current power of the lead-acid battery from the voltage-current-power characteristic curve by using the current actual voltage and the current current of the lead-acid battery.

[0121] S47. Determine whether the power battery of the vehicle performs a charging operation on the lead-acid battery according to the current power.

[0122] In the above solution, the error calibration voltage of vehicle components is determined by using the output voltage when the charge and discharge unit is operating and the target voltage of the lead-acid battery when the charge and discharge unit is operating. Then, the target voltage is calibrated by using the error calibration voltage to determine the current actual voltage of the lead-acid battery. Further, the current actual voltage and the current of the lead-acid battery are used to determine the current charge of the lead-acid battery from the voltage-current-charge characteristic curve. Then, based on the current charge, it is determined whether to use the power battery of the vehicle to charge the lead-acid battery. The charging method for the lead-acid battery provided by this application calibrates the target voltage to more accurately obtain the current actual voltage of the lead-acid battery. Then, based on the relationship between voltage, current, and charge, the current charge of the lead-acid battery is more accurately determined. Then, based on the charge of the lead-acid battery, it is determined whether to charge the lead-acid battery. By the above method, the charging rationality of the lead-acid battery is improved, and the lead-acid battery is prevented from being undercharged or overcharged, thus extending the service life of the lead-acid battery.

[0123] Another embodiment of the charging method for the lead-acid battery provided by this application may specifically include the following steps:

[0124] S51, Determine the error calibration voltage of vehicle components by using the output voltage when the charge and discharge unit is operating and the target voltage of the lead-acid battery when the charge and discharge unit is operating.

[0125] Among them, the target voltage is measured by the electronic control unit.

[0126] S52, Determine the current actual voltage of the lead-acid battery by using the target voltage and the error calibration voltage.

[0127] S53, Obtain the detection current detected by the electronic control unit for the lead-acid battery.

[0128] S54, In response to the vehicle being in the powered-on state, use the electronic control unit to obtain the total working current of all target loads powered by the lead-acid battery.

[0129] Among them, the target load corresponds to the low-voltage load above. Exemplarily, the target load may be at least one of a vehicle lamp, a windshield wiper motor, a window motor, a door lock switch, and some vehicle-mounted sensors.

[0130] In some application scenarios, in response to the vehicle being in the powered-on state, the battery charging device obtains the working current of each target load. Further, the battery charging device calculates the sum of these working currents to obtain the total working current.

[0131] S55, Use the total working current as the calibration current.

[0132] In some embodiments, the battery charging device uses the total working current as the calibration current.

[0133] S56. Determine the current current using the detected current and the calibration current.

[0134] S57. Determine the current power of the lead-acid battery from the voltage-current-power characteristic curve using the current actual voltage and the current current of the lead-acid battery.

[0135] S58. Determine whether the power battery of the vehicle performs a charging operation on the lead-acid battery according to the current power.

[0136] In the above solution, the error calibration voltage of the vehicle components is determined by using the output voltage during the operation of the charge and discharge unit and the target voltage of the lead-acid battery during the operation of the charge and discharge unit. Then, the target voltage is calibrated using the error calibration voltage to determine the current actual voltage of the lead-acid battery. Further, the current power of the lead-acid battery is determined from the voltage-current-power characteristic curve using the current actual voltage and the current current of the lead-acid battery. Then, it is determined whether to use the power battery of the vehicle to charge the lead-acid battery according to the current power. The charging method of the lead-acid battery provided by the present application can more accurately obtain the current actual voltage of the lead-acid battery by calibrating the target voltage, and then more accurately determine the current power of the lead-acid battery according to the relationship between voltage, current and power. Then, based on the power of the lead-acid battery, it is determined whether to charge the lead-acid battery. In this way, the charging rationality of the lead-acid battery is improved, the lead-acid battery is prevented from being undercharged or overcharged, and the service life of the lead-acid battery is extended.

[0137] Another embodiment of the charging method of the lead-acid battery provided by the present application may specifically include the following steps:

[0138] S61. Determine the error calibration voltage of the vehicle components by using the output voltage during the operation of the charge and discharge unit and the target voltage of the lead-acid battery during the operation of the charge and discharge unit.

[0139] Among them, the target voltage is measured by the electronic control unit.

[0140] S62. Determine the current actual voltage of the lead-acid battery using the target voltage and the error calibration voltage.

[0141] S63. Obtain the detected current detected by the electronic control unit for the lead-acid battery.

[0142] S64. In response to the vehicle being in the power-off state, use the electronic control unit to obtain the static working current of all target loads.

[0143] In some application scenarios, the vehicle is in a powered-off state, some target loads powered by a lead-acid battery are in a standby state, and some target loads are in a low-power operation state (such as in-vehicle cameras). The battery charging device obtains the operating current of each target load through an electronic control unit. Further, the battery charging device calculates the sum of these operating currents to obtain the static operating current.

[0144] S65, use the static operating current as the calibration current.

[0145] In some embodiments, the battery charging device uses the static operating current as the calibration current.

[0146] S66, use the detected current and the calibration current to determine the current current.

[0147] In some embodiments, the battery charging device calculates the sum of the detected current and the calibration current to obtain the current current.

[0148] S67, use the current actual voltage and the current current of the lead-acid battery to determine the current power of the lead-acid battery from the voltage-current-power characteristic curve.

[0149] S68, according to the current power, determine whether the power battery of the vehicle performs a charging operation on the lead-acid battery.

[0150] In the above solution, the error calibration voltage of the vehicle components is determined by using the output voltage when the charge and discharge unit works and the target voltage of the lead-acid battery when the charge and discharge unit works. Then, the target voltage is calibrated by using the error calibration voltage to determine the current actual voltage of the lead-acid battery. Further, the current power of the lead-acid battery is determined from the voltage-current-power characteristic curve by using the current actual voltage and the current current of the lead-acid battery. Then, it is judged whether to use the power battery of the vehicle to charge the lead-acid battery according to the current power. The charging method of the lead-acid battery provided by the present application can more accurately obtain the current actual voltage of the lead-acid battery by calibrating the target voltage, and then more accurately determine the current power of the lead-acid battery according to the relationship between voltage, current and power. Then, based on the power of the lead-acid battery, it is judged whether to charge the lead-acid battery. By the above method, the charging rationality of the lead-acid battery is improved, the lead-acid battery is avoided from being undercharged or overcharged, and the service life of the lead-acid battery is extended.

[0151] Another embodiment of the charging method of the lead-acid battery provided by the present application may specifically include the following steps:

[0152] S71, use the output voltage when the charge and discharge unit works and the target voltage of the lead-acid battery when the charge and discharge unit works to determine the error calibration voltage of the vehicle components.

[0153] Among them, the target voltage is measured by an electronic control unit.

[0154] S72. Determine the current actual voltage of the lead-acid battery by using the target voltage and the error calibration voltage.

[0155] S73. Determine the current power of the lead-acid battery from the voltage-current-power characteristic curve by using the current actual voltage and the current current of the lead-acid battery.

[0156] S74. In response to the current power being less than the preset power, use the power battery to charge the lead-acid battery.

[0157] In some embodiments, in response to the current power being less than the preset power, the battery charging device of the battery uses the power battery of the vehicle to charge the lead-acid battery. It can be understood that in response to the current power being greater than or equal to the preset power, the battery charging device of the battery determines not to charge the lead-acid battery.

[0158] In some possible application scenarios, after the battery charging device of the battery determines the step of using the power battery to charge the lead-acid battery, it prompts the driver and passengers through the in-vehicle screen and the terminals of the driver and passengers that the vehicle is charging, so as to avoid the driver and passengers misunderstanding that the power consumption of the vehicle is too large.

[0159] Exemplarily, the preset power is 50%.

[0160] By setting this threshold value of the preset power, over-discharge of the lead-acid battery is avoided, and further, the service life of the lead-acid battery is prolonged.

[0161] In some embodiments, in response to the current power being less than or equal to the first preset power, the battery charging device of the battery uses the power battery of the vehicle to charge the lead-acid battery. Further, during the charging operation, the battery charging device of the battery determines the current power of the battery in the manner of S1-S3. In the charging state, in response to the current power being greater than the second preset power, the battery charging device of the battery stops charging the lead-acid battery.

[0162] Exemplarily, the first preset power is 50% and the second preset power is 90%. By setting the first preset power and the second preset power, over-charging and over-discharging of the lead-acid battery are avoided, and further, the service life of the lead-acid battery is prolonged.

[0163] In the above solution, the error calibration voltage of vehicle components is determined by using the output voltage during the operation of the charge and discharge unit and the target voltage of the lead-acid battery during the operation of the charge and discharge unit. Then, the target voltage is calibrated by using the error calibration voltage to determine the current actual voltage of the lead-acid battery. Further, the current actual voltage and the current of the lead-acid battery are used to determine the current power of the lead-acid battery from the voltage-current-power characteristic curve. Then, according to the current power, it is judged whether to perform a charging operation on the lead-acid battery using the power battery of the vehicle. The charging method of the lead-acid battery provided by this application calibrates the target voltage to more accurately obtain the current actual voltage of the lead-acid battery, then more accurately determines the current power of the lead-acid battery according to the relationship between voltage, current and power, and then judges whether to perform a charging operation on the lead-acid battery based on the power of the lead-acid battery. In this way, the charging rationality of the lead-acid battery is improved, the lead-acid battery is prevented from being undercharged or overcharged, and the service life of the lead-acid battery is extended.

[0164] Please refer to Figure 3 , Figure 3 which is a schematic structural diagram of an embodiment of the battery charging device provided by this application.

[0165] The battery charging device provided by this application is composed of an electronic control unit (ECU), a vehicle control unit (VCU), a battery management system (BMS), a conversion and distribution unit (CDU), an ambient temperature sensor, a display module, etc. It should be noted that the battery management system here is the battery management system of the power battery of the vehicle.

[0166] Among them, the ambient temperature sensor is connected to the electronic control unit, the electronic control unit is connected to the vehicle control unit, the vehicle control unit is respectively connected to the display module, the conversion and distribution unit, and the battery management system, the conversion and distribution unit is connected to the lead-acid battery, and the lead-acid battery is also connected to the electronic control unit.

[0167] Specifically, the ambient temperature sensor is used to obtain the ambient temperature of the lead-acid battery.

[0168] The electronic control unit is used to detect the voltage of the battery. In some embodiments, the electronic control unit periodically obtains the voltage value of the detection power supply circuit.

[0169] In some embodiments, the electronic control unit is used to calibrate the detection error of bicycle components. When the charging and discharging integrated unit of the vehicle is working, the output voltage is stable at 13.85V. Therefore, at an ambient temperature of 25°C, the error calibration voltage of the vehicle components = the output voltage when the CDU is working (13.85V) - the voltage actually detected by the electronic control unit (ECU) when the CDU is working.

[0170] In some embodiments, the electronic control unit is also used to calibrate the temperature error voltage. Specifically, the electronic control unit obtains the outside temperature from the ambient temperature sensor for battery voltage calibration.

[0171] It should be noted that when the ambient temperature < 25°C, for every 10°C decrease in the ambient temperature, the battery voltage decreases by 0.1V; when the ambient temperature ≥ 25°C, the influence of temperature increase on the battery voltage can be ignored. Based on this, when the ambient temperature < 25°C, the temperature calibration voltage = (actual temperature - 25°C) / 100, and when the ambient temperature ≥ 25°C, the temperature calibration voltage = 0V.

[0172] In some embodiments, the electronic control unit is also used to calibrate the vehicle current error. The electronic control unit judges the vehicle battery load (i.e., the internal measured current) through the internal loop for battery voltage calibration.

[0173] In some application scenarios, when the vehicle is in the power-off state, then:

[0174] Vehicle current = internal measured current of the controller + vehicle static power consumption current.

[0175] In some application scenarios, when the vehicle is in the power-on state, then:

[0176] Vehicle current = internal measured current of the controller + working current of each load.

[0177] Furthermore, in the case of knowing the vehicle current and the actual battery voltage, according to the voltage-electricity characteristic curve of the battery under different loads, the true battery electricity information is obtained.

[0178] Among them, the actual battery voltage = target voltage of the electronic control unit + component error calibration voltage + temperature calibration voltage.

[0179] Furthermore, after the electronic control unit determines the battery power, it judges whether the battery power is lower than the preset power.

[0180] When the battery power is lower than the preset power, the electronic control unit sends a charging request to the vehicle control unit and sends a response message to the display module, and the display module correspondingly displays a trigger for a charging reminder.

[0181] Among them, the vehicle control unit is used to receive the charging request sent by the electronic control unit. Further, after receiving the charging request, the vehicle control unit determines the vehicle high-voltage activation condition (that is, whether it meets the condition of using the power battery to charge the lead-acid battery). When the high-voltage activation condition is met, it controls the vehicle to go on high voltage.

[0182] Among them, when the battery management system receives the high-voltage instruction from the vehicle control unit, it controls the power battery to provide high-voltage electrical energy to the charge-discharge integrated unit.

[0183] Among them, the charge-discharge integrated unit is used to convert the high-voltage electrical energy provided by the power battery into a stable voltage source of 13.85V low voltage to charge the lead-acid battery.

[0184] In the above solution, the error calibration voltage of vehicle components is determined by using the output voltage when the charge-discharge unit works and the target voltage of the lead-acid battery when the charge-discharge unit works. Then, the target voltage is calibrated by using the error calibration voltage to determine the current actual voltage of the lead-acid battery. Further, the current actual voltage and the current of the lead-acid battery are used to determine the current power of the lead-acid battery from the voltage-current-power characteristic curve. Then, according to the current power, it is judged whether to use the power battery of the vehicle to charge the lead-acid battery. The charging method of the lead-acid battery provided by this application calibrates the target voltage to more accurately obtain the current actual voltage of the lead-acid battery, then more accurately determines the current power of the lead-acid battery according to the relationship between voltage, current and power, and then judges whether to charge the lead-acid battery based on the power of the lead-acid battery. In this way, the charging rationality of the lead-acid battery is improved, the lead-acid battery is avoided from being undercharged or overcharged, and the service life of the lead-acid battery is extended.

[0185] Please continue to refer to Figure 4 , Figure 4 which is a schematic structural diagram of an embodiment of the terminal device provided by this application. The terminal device 500 in the embodiment of this application includes a processor 51 and a memory 52.

[0186] The processor 51 and the memory 52 are connected to the bus. Program data is stored in the memory 52. The processor 51 is used to execute the program data to implement the charging method of the lead-acid battery described in the above embodiment.

[0187] In an embodiment of the present application, the processor 51 may also be referred to as a CPU (Central Processing Unit). The processor 51 may be an integrated circuit chip with signal processing capabilities. The processor 51 may also be a general-purpose processor, a digital signal processor (DSP, Digital Signal Process), an application specific integrated circuit (ASIC, Application Specific Integrated Circuit), a field programmable gate array (FPGA, Field Programmable Gate Array), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components. The general-purpose processor may be a microprocessor or the processor 51 may also be any conventional processor, etc.

[0188] The present application also provides a computer storage medium. Please continue to refer to Figure 5 , Figure 5 FIG. is a schematic structural diagram of an embodiment of the computer storage medium provided by the present application. Program data 61 is stored in the computer storage medium 600. When the program data 61 is executed by a processor, it is used to implement the method for replenishing power of the lead-acid battery in the above embodiment.

[0189] When the embodiments of the present application are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) or a processor to execute all or part of the steps of the methods described in various embodiments of the present application. The foregoing storage medium includes: various media such as USB flash drives, mobile hard disks, read-only memories (ROM, Read-Only Memory), random access memories (RAM, Random Access Memory), magnetic disks, or optical discs that can store program codes.

[0190] The above are only the embodiments of the present application, and do not limit the patent scope of the present application accordingly. Any equivalent structural or equivalent process transformation made by using the content of the specification and drawings of the present application, or directly or indirectly applied in other related technical fields, shall be equally included in the patent protection scope of the present application.

Claims

1. A method for replenishing power of a lead-acid battery, characterized in that: The method comprises: Determine the error calibration voltage of vehicle components by using the output voltage of the charge and discharge unit when it is working and the target voltage of the lead-acid battery when the charge and discharge unit is working, wherein the target voltage is measured by an electronic control unit; Determine the current actual voltage of the lead-acid battery by using the target voltage and the error calibration voltage; Determine the current power of the lead-acid battery from a voltage-current-power characteristic curve using the current actual voltage and the current current of the lead-acid battery; According to the current power level, it is determined whether the power battery of the vehicle is performing a charging operation on the lead-acid battery.

2. The method according to claim 1, characterized in that The method of determining the current actual voltage of the lead-acid battery by using the target voltage and the error calibration voltage includes: Obtaining the ambient temperature of the lead-acid battery; Determining a temperature calibration voltage according to the ambient temperature; The present actual voltage of the lead-acid battery is determined using the target voltage, the error calibration voltage, and the temperature calibration voltage.

3. The method according to claim 2, characterized in that The step of determining the temperature calibration voltage according to the ambient temperature includes: In response to the ambient temperature being lower than a reference temperature, calculating a temperature difference between the reference temperature and the ambient temperature; Using the temperature difference, the temperature calibration voltage is determined.

4. The method according to claim 3, characterized in that The step of determining the temperature calibration voltage according to the ambient temperature further comprises: In response to the ambient temperature being greater than or equal to the reference temperature, the temperature calibration voltage is determined to be zero.

5. The method according to claim 1, characterized in that Before the step of using the current actual voltage and the current current of the lead-acid battery to determine the current power of the lead-acid battery from a voltage-current-power characteristic curve, the method includes: Acquire a detection current obtained by the electronic control unit from detecting the lead-acid battery; determining a calibration current based on an operating state of the vehicle; The present current is determined using the detection current and the calibration current.

6. The method according to claim 5, characterized in that The step of determining the calibration current based on the running state of the vehicle includes: In response to the vehicle being in a powered-on state, obtaining, by the electronic control unit, a total operating current of all target loads powered by the lead-acid battery; The sum of the working currents is used as the calibration current.

7. The method according to claim 5, characterized in that The step of determining the calibration current based on the operating state of the vehicle further includes: In response to the vehicle being in a power-off state, obtaining the static operating current of all the target loads by using the electronic control unit; The static operating current is used as the calibration current.

8. The method according to claim 1, characterized in that: The determining, based on the current power level, whether the power battery of the vehicle is performing a charging operation on the lead-acid battery comprises: In response to the current power being less than a preset power, the power battery is used to perform a charging operation on the lead-acid battery.

9. A terminal device, characterized in that: The terminal device includes a processor and a memory connected to the processor, wherein: The memory stores program instructions; The processor is configured to execute program instructions stored in the memory to implement the method according to any one of claims 1 to 8.

10. A computer-readable storage medium, characterized in that: The storage medium stores program instructions, and when the program instructions are executed, the method according to any one of claims 1 to 8 is implemented.

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