Mobile energy storage battery for automatic car chargers

Abstract

This invention relates to a portable energy storage battery for an automatic car charger, comprising a control unit, a charging voltage and current sampling circuit electrically connected to the car's charging port, a charging switch circuit, and a battery pack. The control unit's car start-up status determination module acquires the current voltage of the charging port detected by the charging voltage and current sampling circuit, determines the corresponding starting voltage of the car battery based on this current voltage, and then determines whether the current voltage is greater than or equal to the car battery's starting voltage. When the current voltage is greater than or equal to the car battery's starting voltage, the charging switch circuit is turned on to charge the battery pack. This invention's portable energy storage battery for an automatic car charger calculates the car battery voltage by detecting the current voltage of the charging port, thereby quickly determining the engine's operating status and automatically charging the portable energy storage battery when the car starts, effectively avoiding the problem of excessive battery power consumption and permanent battery damage.

Description

Technical Field

[0001] This application is a divisional application of Chinese invention patent "Method for Automatic Car Charging of Mobile Energy Storage Battery and Mobile Energy Storage Battery for Automatic Car Charging" with application number 202210743336.1 and application date of June 28, 2022.

[0002] This invention relates to the technical field of mobile energy storage batteries, and in particular to a method for automatic vehicle charging of mobile energy storage batteries and a mobile energy storage battery for automatic vehicle charging. Background Technology

[0003] In modern society, with the increasing electrification of people's lives, the number of electrical devices such as mobile phones, drones, and small household appliances is constantly increasing, and mobile power consumption scenarios are becoming increasingly diversified. On the other hand, with the increasing penetration rate of people's participation in outdoor activities and the enhancement of safety and disaster preparedness awareness, the market demand for mobile energy storage batteries is growing. In order to better play its role in emergency power replenishment, mobile energy storage batteries must be regularly charged and maintained to keep them in a constantly charged state.

[0004] Currently, portable energy storage batteries offer various charging methods, such as car chargers, solar charging, and AC charging. Car chargers are commonly used in mobile scenarios like outdoor activities, enabling regular charging and maintenance of the battery while the vehicle is in use. During car charging, the portable battery connects to the car's charging port via a car charger adapter, and the car's power system supplies power to the battery through the charging port. However, in daily life, it's common to leave the power on after parking, such as during temporary stops, at red lights, or in traffic jams. When a partially charged portable battery is connected to the car charger, the car battery continues to output power through the port. Prolonged power supply can cause the car battery voltage to drop too low, affecting the car's starting function and potentially leading to over-discharge and serious damage to the battery. Summary of the Invention

[0005] Based on this, the purpose of the present invention is to provide a method for automatic vehicle charging of mobile energy storage batteries to avoid over-discharging of automotive batteries.

[0006] This invention is achieved through the following technical solution:

[0007] A method for automatic vehicle charging of mobile energy storage batteries includes the following steps:

[0008] The current voltage at the car charger port is detected to determine the starting voltage of the car battery, and the current voltage at the car charger port is compared with the starting voltage of the car battery.

[0009] The mobile energy storage battery is charged when the current voltage of the vehicle charging port is greater than or equal to the starting voltage of the vehicle battery.

[0010] The automatic car charging method for mobile energy storage batteries described in this invention quickly determines the vehicle's starting status by detecting the current voltage at the charging port during the charging process, and only charges the mobile energy storage battery when the vehicle is running. This not only enables automatic car charging maintenance of the mobile energy storage battery while the vehicle is in motion, but also avoids excessive consumption of the vehicle's battery power, thereby protecting the vehicle's battery.

[0011] Furthermore, the mobile energy storage battery is connected to the car charger port via a car charger adapter, and the process also includes the following steps:

[0012] When the current voltage of the car charger port is less than the starting voltage of the car battery, the internal resistance of the car charger adapter is detected, and the current voltage of the car charger port is corrected according to the internal resistance of the car charger adapter to obtain the current corrected voltage of the car charger port.

[0013] Determine whether the current corrected voltage of the vehicle charging port is greater than or equal to the starting voltage of the vehicle battery; if the current corrected voltage of the vehicle charging port is greater than or equal to the starting voltage of the vehicle battery, charge the mobile energy storage battery; otherwise, do not charge the mobile energy storage battery.

[0014] Based on the current voltage of the car charger port, this invention also takes into account the influence of the internal resistance of the car charger adapter plug, and further calculates the current corrected voltage of the car charger port, thereby improving the accuracy of judging whether the car is started.

[0015] Furthermore, an external vehicle charger voltage and current sampling circuit is electrically connected to the vehicle charger port via the vehicle charger adapter plug. The power of the vehicle charger voltage and current sampling circuit is changed, enabling it to detect the current voltage and current of the two vehicle charger ports, according to the formula:

[0016] (1)

[0017] (2)

[0018] The internal resistance of the car charger adapter and the current corrected voltage of the car charger port are calculated; where, This indicates the current corrected voltage of the car charger port. This indicates the internal resistance of the car charger adapter plug. , These represent the current voltage and current of the vehicle charging port detected by the vehicle charging voltage and current sampling circuit at the first power level, respectively. , These represent the current voltage and current of the vehicle charging port detected by the vehicle charging voltage and current sampling circuit under the second power, respectively; wherein the first power is not equal to the second power, and neither of them is equal to zero.

[0019] Furthermore, before detecting the current voltage of the car charger port, the following steps are included:

[0020] When the portable energy storage battery is connected to the aforementioned car charger port, it is determined whether the current charge level of the portable energy storage battery is less than or equal to its target charge level. If the current charge level of the portable energy storage battery is less than or equal to its target charge level, the current voltage of the car charger port is detected. This step can prevent the portable energy storage battery from being overcharged, which helps to extend the service life of the portable energy storage battery.

[0021] The present invention also provides a mobile energy storage battery for an automatic car charger, including a control unit, a car charger voltage and current sampling circuit, a charging switch circuit, and a battery pack electrically connected to the car charger port; wherein, the control unit includes a car start status determination module;

[0022] The vehicle start-up status determination module obtains the current voltage of the vehicle charging port detected by the vehicle charging voltage and current sampling circuit, and determines the corresponding start-up voltage of the vehicle battery based on the current voltage of the vehicle charging port. Then, it determines whether the current voltage of the vehicle charging port is greater than or equal to the start-up voltage of the vehicle battery. When the current voltage of the vehicle charging port is greater than or equal to the start-up voltage of the vehicle battery, it controls the charging switch circuit to be turned on to charge the battery pack.

[0023] Furthermore, the mobile energy storage battery is connected to the car charger port via a car charger adapter plug, and the control unit also includes a car start-up status correction module;

[0024] When the vehicle start-up status determination module determines that the current voltage of the charging port is less than the start-up voltage of the vehicle battery, the vehicle start-up status correction module acquires the current voltage and current of the two charging ports detected by the charging voltage and current sampling circuit at different power levels. Then, based on the current voltage and current of the two charging ports, it directly calculates the internal resistance of the charging adapter and the current corrected voltage of the charging port, and determines whether the current corrected voltage of the charging port is greater than or equal to the start-up voltage of the vehicle battery. When the current corrected voltage of the charging port is greater than or equal to the start-up voltage of the vehicle battery, it controls the charging switch circuit to be turned on to charge the battery pack. When the current corrected voltage of the charging port is less than the start-up voltage of the vehicle battery, it controls the charging switch circuit to be turned off to prevent charging of the battery pack.

[0025] Furthermore, the vehicle charging voltage and current sampling circuit includes a first voltage sampling resistor, a second voltage sampling resistor, a current sampling resistor, and an operational amplifier. The first voltage sampling resistor, the second voltage sampling resistor, and the current sampling resistor are connected in series and electrically connected to the vehicle charging port via the vehicle charging adapter. An AD sampling port of the control unit is connected in series between the first voltage sampling resistor and the second voltage sampling resistor, allowing direct acquisition of the voltage division value across the first voltage sampling resistor. The operational amplifier is connected in parallel with the current sampling resistor, directly acquiring and amplifying the voltage across the current sampling resistor before transmitting it to an AD sampling port of the control unit. The control unit can calculate the current value flowing through the current sampling resistor based on the amplified voltage value across the current sampling resistor, thereby obtaining the current value of the vehicle charging port.

[0026] Furthermore, the formula for calculating the current voltage of the car charger port is as follows:

[0027] (4)

[0028] In the formula, The current voltage of the car charger port. This is the voltage divider signal across the first voltage sampling resistor. The resistance value of the first voltage sampling resistor. The resistance value of the first voltage sampling resistor.

[0029] Furthermore, the mobile energy storage battery also includes a mobile energy storage battery power detection circuit that is electrically connected to an AD sampling port of the battery pack and the control unit respectively, and the control unit also includes a mobile energy storage battery power judgment module;

[0030] The mobile energy storage battery power detection circuit detects relevant circuit parameters of the battery pack and transmits these parameters to an AD sampling port of the control unit. The mobile energy storage battery power judgment module determines whether the mobile energy storage battery is connected to the car charger port via the car charger adapter. Simultaneously, based on the collected relevant circuit parameters of the battery pack, it calculates the current power level of the battery pack and determines whether the current power level is less than or equal to its target power level. When the current power level of the mobile energy storage battery is greater than its target power level, the charging switch circuit is controlled to cut off charging of the battery pack. When the current power level of the mobile energy storage battery is less than or equal to its target power level, the vehicle start status judgment module is triggered to operate.

[0031] Furthermore, the control unit is a microcontroller, and the charging switch circuit is a boost circuit.

[0032] Compared with existing technologies, this invention provides a method for automatic car charging of a mobile energy storage battery, and a mobile energy storage battery for automatic car charging. By detecting the current voltage of the charging port, the invention quickly determines the starting status of the car and charges the mobile energy storage battery when the car starts, achieving the effect of automatic charging maintenance and protection of the car battery in mobile scenarios. Furthermore, this invention also considers the influence of the internal resistance of the car charger adapter and further calculates the current corrected voltage of the charging port, improving the accuracy of determining the car's starting status. This effectively solves the problem of the car battery being over-discharged during charging of the mobile energy storage battery, which can prevent the car from starting normally, thus bringing convenience to mobile travel. In addition, stopping charging when the current charge of the mobile energy storage battery reaches the target charge level can avoid overcharging and serious damage to the mobile energy storage battery, and is beneficial for saving energy.

[0033] To better understand and implement this invention, the following detailed description is provided in conjunction with the accompanying drawings. Attached Figure Description

[0034] Figure 1 This is a flowchart of the steps of an automatic vehicle charging method for mobile energy storage batteries according to an embodiment of the present invention;

[0035] Figure 2 A schematic diagram of the circuit structure of a mobile energy storage battery provided in an embodiment of the present invention;

[0036] Figure 3 An equivalent circuit diagram of a mobile energy storage battery during charging, provided in an embodiment of the present invention;

[0037] Figure 4 This is a schematic diagram of a circuit module for a mobile energy storage battery provided in an embodiment of the present invention.

[0038] Reference numerals: 1. Mobile energy storage battery; 11. Battery pack; 12. Mobile energy storage battery power detection circuit; 13. Vehicle charging voltage and current sampling circuit; 14. Control unit; 141. Mobile energy storage battery power judgment module; 142. Vehicle starting status judgment module; 143. Vehicle starting status correction module; 15. Charging switch circuit; 2. Vehicle charging adapter plug; 3. Vehicle charging port; 4. Vehicle battery; 5. Vehicle alternator. Detailed Implementation

[0039] A car's power system includes a generator and a battery connected in parallel, providing electrical energy for starting, driving, and using electrical equipment. Specifically, when the car's engine is running normally, it drives the generator to produce electricity, which then supplies power to electrical equipment and charges the battery. When the engine is off, the generator does not produce electricity, and the battery supplies power to electrical equipment, as well as providing electrical energy to the engine and other components at the moment of starting the car.

[0040] The voltage of a car battery differs significantly between when the engine is running and when it is off. When the engine is off, the alternator is not working, and the battery supplies power to the car's electrical devices. Its voltage gradually decreases as the power consumption of these devices increases, eventually leading to depletion or even over-discharge. When the car is running, the alternator continuously supplies power to the electrical devices and the battery, and the battery voltage gradually increases as the engine speed increases. For a 12V battery, the voltage should be maintained between 13.5 and 14.5V after the car is started; while for a 24V battery, the voltage should be between 27 and 29V after the car is started.

[0041] In existing technologies, charging portable energy storage batteries via car chargers can easily lead to over-discharge of the car battery because the portable battery continues to consume energy even when the car is off. Therefore, this invention, based on the characteristic that car batteries have different voltages under different car starting states, proposes an automatic car charger method for portable energy storage batteries. This method calculates the car battery voltage by detecting the current voltage at the car charger port, thereby quickly determining whether the car is running or off, and automatically charging the portable battery when the car starts, effectively avoiding the problem of permanent battery damage caused by excessive consumption of the car battery's power. Furthermore, since portable energy storage batteries are connected to the car charger port via a car charger adapter, and considering the influence of the adapter's internal resistance on the charger port voltage, this invention also calculates the adapter's internal resistance to correct the current voltage at the charger port, achieving accurate judgment of the car's starting state and avoiding the phenomenon of not charging the portable battery in time due to misjudgment.

[0042] To make the objectives, technical solutions, and advantages of the present invention clearer, specific embodiments are described below.

[0043] Please see Figure 1 This is a flowchart illustrating the steps of the automatic vehicle charging method for mobile energy storage batteries provided in this embodiment. The method includes the following steps:

[0044] S1: Determine whether the mobile energy storage battery is connected to the car charger port. If so, proceed to step S2.

[0045] S2: Determine whether the current charge level of the mobile energy storage battery is less than or equal to the target charge level of the mobile energy storage battery; if yes, it means that the mobile energy storage battery needs automatic vehicle charging, then proceed to step S3; if no, it means that the mobile energy storage battery does not need charging, then proceed to step S8. The target charge level of the mobile energy storage battery is 30-95%, and its value can be set according to the user's actual needs. Preferably, the target charge level is 90%.

[0046] S3: Detect the current voltage at the car charger port to determine the car battery's starting voltage. The current voltage at the charger port reflects the car battery's voltage, while the starting voltage is the minimum voltage the car battery must withstand when starting the car. For example, if the current voltage at the charger port is between 11 and 15V, the car battery's rated voltage is 12V, and its starting voltage should be 13.5V. If the current voltage is between 22 and 30V, the car battery's rated voltage is 24V, and its starting voltage should be 27V. Therefore, the car battery's starting voltage can be directly derived and compared by detecting the current voltage at the charger port.

[0047] S4: Compare the current voltage at the car charger port with the starting voltage of the car battery. Determine if the current voltage at the car charger port is greater than or equal to the starting voltage of the car battery. If not, proceed to step S5; if yes, proceed to step S7. Since the starting voltage of the car battery reflects the minimum voltage of the car battery when the car is starting, comparing the current voltage at the car charger port with the starting voltage of the car battery determines whether the car is currently running. That is, when the current voltage at the car charger port is less than or equal to the car battery voltage, it can be determined that the car is off; conversely, it can be determined that the car is running.

[0048] S5: Detect the internal resistance of the car charger adapter and correct the current voltage of the charging port based on the internal resistance of the car charger adapter to obtain the current corrected voltage of the charging port. In step S3, an external sampling circuit needs to be electrically connected to the charging port through the car charger adapter, and the voltage detected by the sampling circuit is used as the current voltage of the charging port. However, the actual voltage of the charging port is the sum of the voltage across the car charger adapter and the voltage detected by the sampling circuit. That is to say, the current voltage of the charging port is less than the actual voltage of the charging port, and the current corrected voltage of the charging port calculated by the internal resistance of the car charger adapter is equal to the actual voltage of the charging port, thus accurately calculating the actual voltage of the car battery.

[0049] The process for detecting the internal resistance of the car charger adapter is as follows: The power of the external sampling circuit is changed so that it detects the current voltage and current of the two charging ports, according to the formula:

[0050] (1)

[0051] (2)

[0052] The internal resistance of the car charger adapter and the current corrected voltage of the car charger port are calculated. In the formula, This indicates the current corrected voltage at the car charger port. This indicates the internal resistance of the car charger adapter plug. , These represent the current voltage and current at the charging port detected by the sampling circuit at the first power level, respectively. , These represent the current voltage and current of the car charger port detected by the sampling circuit under the second power, respectively; where the first power is not equal to the second power, and neither of them is equal to zero.

[0053] It should be noted that the aforementioned car charger adapter is a connection device between the portable energy storage battery and the car charger port. It can consist of a car charger adapter and a charging cable, and its internal resistance is the sum of the internal resistance of the car charger adapter and the internal resistance of the charging cable. For the same car charger adapter, its internal resistance is fixed. Within the preset time period, it is necessary to measure according to formulas (1) and (2). The internal resistance of the car charger adapter plug; if The internal resistance of the car charger adapter obtained in each measurement was the same. The average internal resistance value obtained from these measurements is the internal resistance of the car charger adapter plug; if If the internal resistance of the car charger adapter measured in the previous measurements is different, it is necessary to re-detect the current voltage and current of the car charger port and recalculate the internal resistance of the car charger adapter. Here, N is a positive integer greater than 2.

[0054] If the car charger adapter is not replaced, the internal resistance of the adapter only needs to be calibrated and saved the first time it is used for charging. Subsequent charging processes can then directly calculate the current corrected voltage at the charging port based on the saved internal resistance. However, in reality, car charger adapters often need to be replaced frequently. Therefore, the internal resistance of the adapter can be recalibrated each time it is replaced, or it can be calibrated before each charging session.

[0055] When the internal resistance of the car charger adapter is known, the formula can be used:

[0056] (3)

[0057] The current corrected voltage at the car charger port can be directly calculated, where, This refers to the current voltage at the car charger port detected by the sampling circuit under arbitrary power conditions. This represents the current current at the car charger port detected by the sampling circuit under arbitrary power conditions.

[0058] S6: Compare the current corrected voltage at the car charger port with the starting voltage of the car battery to determine if the current corrected voltage at the car charger port is greater than or equal to the starting voltage of the car battery. If yes, it means the car is running, and proceed to step S7; if no, it means the car is off, and proceed to step S8. Since the current corrected voltage at the car charger port reflects the actual voltage of the car battery, comparing the current corrected voltage at the car charger port with the starting voltage of the car battery allows for an accurate determination of whether the car is currently running.

[0059] S7: Charge the portable energy storage battery. When the current voltage at the charging port is greater than or equal to the starting voltage of the car battery, or when the current corrected voltage at the charging port is greater than or equal to the starting voltage of the car battery, the car is in the starting state. Charging the portable energy storage battery at this time ensures that the car battery's energy is not excessively consumed, thus avoiding problems such as over-discharge of the car battery and the car failing to start normally. Simultaneously, the charging process needs to continuously execute step S2, which involves real-time judgment of whether the current charge level of the portable energy storage battery is less than or equal to the target charge level. If so, it indicates that the portable energy storage battery is not fully charged and charging maintenance needs to continue.

[0060] S8: Do not charge the mobile energy storage battery. When the current charge of the mobile energy storage battery exceeds its target charge, it indicates that the battery has completed its charging maintenance and charging should be stopped immediately to prevent overcharging and permanent damage. When the current corrected voltage at the car charger port is less than the starting voltage of the car battery, it indicates that the car is off and charging should not be performed to prevent excessive consumption of the car battery.

[0061] Based on the above-described method for automatic car charging of mobile energy storage batteries, this invention also provides a mobile energy storage battery for automatic car charging. Please also refer to... Figures 2-3 ,in, Figure 2 This is a schematic diagram of the circuit structure of the mobile energy storage battery provided in this embodiment. Figure 3 The equivalent circuit diagram for charging the mobile energy storage battery provided in this embodiment is shown. The mobile energy storage battery 1 is electrically connected to the car charger port 3 via the car charger adapter 2; the car battery 4 and the car generator 5 are connected in parallel to form the car's power system, and supply power to the mobile energy storage battery 1 via the car charger port 3 and the car charger adapter 2.

[0062] Please also refer to Figure 4 , it is Figure 2The diagram shows a circuit module schematic of a mobile energy storage battery. The mobile energy storage battery 1 includes a battery pack 11, a mobile energy storage battery power detection circuit 12, a vehicle charging voltage and current sampling circuit 13, a control unit 14, and a charging switch circuit 15. The control unit 14 employs a microcontroller unit (MCU) and has multiple analog-to-digital (AD) sampling ports, capable of acquiring voltage and current signals collected by the vehicle charging voltage and current sampling circuit 13, as well as current and other circuit parameter signals collected by the mobile energy storage battery power detection circuit 12. Furthermore, the control unit 14 includes a mobile energy storage battery power judgment module 141, a vehicle start-up status judgment module 142, and a vehicle start-up status correction module 143.

[0063] Specifically, the battery pack 11 consists of at least one secondary battery capable of multiple charge-discharge cycles; wherein, the secondary battery can be a lithium-ion battery (LiB), a lead-acid battery, or a vanadium redox flow battery.

[0064] The mobile energy storage battery power detection circuit 12 is electrically connected to an AD sampling port of both the battery pack 11 and the control unit 14. The mobile energy storage battery power detection circuit 12 detects relevant circuit parameters of the battery pack 11, such as charging current, charging time, open-circuit voltage, charging voltage, and electromotive force, and transmits these parameters to an AD sampling port of the control unit 14. The mobile energy storage battery power judgment module 141 determines that the mobile energy storage battery 1 is connected to the car charger port 3 via the car charger adapter 2. Simultaneously, based on the collected relevant circuit parameters of the battery pack 11, it calculates the current power level of the battery pack 11. The estimation method can be the ampere-hour method, open-circuit voltage method, electromotive force method, neural network method, or Kalman filtering method, etc. Then, it is determined whether the current charge of the battery pack 11 is less than or equal to its target charge. When the current charge of the battery pack 11 is greater than its target charge, the charging switch circuit 15 is turned off by pulse width modulation (PWM) to prevent charging of the battery pack 11. When the current charge of the battery pack 11 is less than or equal to its target charge, the vehicle start status determination module 142 is triggered to start working.

[0065] The vehicle charger voltage and current sampling circuit 13 includes a first voltage sampling resistor R1, a second voltage sampling resistor R2, a current sampling resistor RS, an operational amplifier (OA), and a filter capacitor C1. The first voltage sampling resistor R1, the second voltage sampling resistor R2, and the current sampling resistor RS are connected in series and electrically connected to the vehicle charger port 3 via the vehicle charger adapter plug 2. An AD sampling port of the control unit 14 is connected in series between the first voltage sampling resistor R1 and the second voltage sampling resistor R2, directly obtaining the voltage division value across the first voltage sampling resistor R1. The operational amplifier OA is connected in parallel with the current sampling resistor RS. It directly acquires the voltage across the current sampling resistor RS, amplifies it, and transmits it to the AD sampling port of the control unit 14. The control unit 14 can calculate the current value flowing through the current sampling resistor RS based on the amplified voltage value across the current sampling resistor RS, thereby obtaining the current value of the vehicle charger port. In addition, the filter capacitor C1 is connected in parallel across the first voltage sampling resistor R1 and the second voltage sampling resistor R2, and in series with the current sampling resistor RS, to filter out high-frequency signals (or interference signals) in the circuit, thereby improving the accuracy of the acquired signal.

[0066] The control unit 14 can calculate the voltage values ​​across the first voltage sampling resistor R1 and the second voltage sampling resistor R2 based on the voltage division value across the first voltage sampling resistor R1. The calculation formula is as follows:

[0067] (4)

[0068] In the formula, The current voltage of car charger port 3. This is the voltage divider signal across the first voltage sampling resistor R1. The resistance value of the first voltage sampling resistor R1, The resistance value of the first voltage sampling resistor R2.

[0069] Since the vehicle charging voltage and current sampling circuit 13 can only directly obtain the voltage values ​​across the first voltage sampling resistor R1 and the second voltage sampling resistor R2, when initially determining whether the car is in the starting state, the voltage across the first voltage sampling resistor R1 and the second voltage sampling resistor R2 is first used as the current voltage of the car charging port 3.

[0070] The vehicle start-up status judgment module 142 obtains the current voltage of the vehicle charging port detected by the vehicle charging voltage and current sampling circuit, and determines the corresponding start-up voltage of the vehicle battery based on the current voltage of the vehicle charging port 3. Then it judges whether the current voltage of the vehicle charging port 3 is greater than or equal to the start-up voltage of the vehicle battery 4. When the current voltage of the vehicle charging port 3 is greater than or equal to the start-up voltage of the vehicle battery 4, the charging switch circuit 15 is turned on by PWM control to charge the battery pack 11.

[0071] When the vehicle start-up status judgment module 142 determines that the current voltage of the charging port 3 is less than the start-up voltage of the vehicle battery 4, the vehicle start-up status correction module 143 acquires the current voltage and current of the two charging ports 3 detected by the charging voltage and current sampling circuit 13 at different power levels; then, based on the current voltage and current of the two charging ports 3, it directly calculates the internal resistance of the charging adapter plug 2 and the current corrected voltage of the charging port 3, and determines whether the current corrected voltage of the charging port 3 is greater than or equal to the start-up voltage of the vehicle battery 4; when the current corrected voltage of the charging port 3 is greater than or equal to the start-up voltage of the vehicle battery 4, it controls the charging switch circuit 15 to conduct to charge the battery pack 11; when the current corrected voltage of the charging port 3 is less than the start-up voltage of the vehicle battery 4, it controls the charging switch circuit 15 to cut off to stop charging the battery pack 11.

[0072] Furthermore, the charging switch circuit 15 employs a boost converter circuit, which includes an inductor L1, a diode D1, a boost capacitor C2, and a switching transistor Q1. In other embodiments, the charging switch circuit 15 may also integrate the boost converter circuit into a control chip.

[0073] In this configuration, inductor L1 and diode D1 are connected in series between the output terminal of the car charger adapter 2 and the input terminal of the battery pack 11, forming a series connection with the current sampling resistor RS and a parallel connection with the first voltage sampling resistor R1 and the second voltage sampling resistor R2. Boost capacitor C2 is connected in parallel across the battery pack 11, with its input terminal connected in series with the output terminal of diode D1 and its output terminal connected in series with the input terminal of the current sampling resistor RS. The switching transistor Q1 includes a first pin, a second pin, and a third pin. The first pin is connected between the output terminal of inductor L1 and the input terminal of diode D1. The second pin is grounded and connected between the output terminal of boost capacitor C2 and the input terminal of current sampling resistor RS. The third pin is directly connected to control unit 14. The switching transistor Q1 can be a MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor) or a switching transistor. In this embodiment, the switching transistor Q1 is a MOSFET, with the first pin being the drain (D), the second pin being the source (S), and the third pin being the gate (G).

[0074] When the charging switch circuit is off, the switch Q1 is in the on state and is equivalent to a wire. At this time, the current at the charging port charges the inductor L1, but does not charge the battery pack 14. When the charging switch circuit is on, the switch Q1 is in the off state and is equivalent to an open circuit. The current at the charging port charges the battery pack 11, and the electrical energy stored in the inductor L1 also charges the battery pack 11 through the diode D1, making the charging voltage across the battery pack 11 greater than the current voltage at the charging port 3.

[0075] The following is an example of an application:

[0076] The resistance value of the first voltage sampling resistor R1 is The resistance value of the second voltage sampling resistor R2 is As shown in Table 1, during the first sampling, the control unit 14 acquired the current signal. It can be determined that the mobile energy storage battery 1 is not connected to the car charging port 3 and cannot be charged. During the second sampling, the control unit 14 obtains the current signal. It can be determined that the mobile energy storage battery 1 is connected to the car charger port 3 and can be charged; at this time, the voltage divider signal collected by the car charger voltage and current sampling circuit 13... The current voltage of the car charger port 3 is calculated according to formula (4). It can be determined that the rated voltage of the car battery is 12V, and the corresponding starting voltage of the car battery is 13.5V. Therefore, the car starting status determination module 142 can determine... That is, if the current voltage of the car charger port 3 is greater than the starting voltage of the car battery 4, and the car engine is running normally, then the charging switch circuit 15 is turned on to charge the battery pack 11. During the 4th and 5th sampling, the voltage divider signals collected by the car charger voltage and current sampling circuit 13 are respectively... , According to formula (4), the current voltage of the car charger port 3 is calculated as follows: , The vehicle start-up status determination module 142 determines that the current voltage of both the charging port 3 and the vehicle battery 4 is less than the start-up voltage of the battery. At this time, the vehicle start-up status correction module 143 further acquires the current signals from the fourth and fifth samples. , And according to formulas (1) and (2), the internal resistance of the car charger adapter plug 2 can be calculated as follows: Then, the current corrected voltage of the car charger port 3 is calculated as follows: If the vehicle start-up status correction module 143 determines that the current correction voltage of the vehicle charging port 3 is greater than the start-up voltage of the vehicle battery 4 and the vehicle engine is running normally, then it controls the charging switch circuit 15 to be turned on to charge the battery pack 11.

[0077] Table 1. Measured data of mobile energy storage battery 1 during automatic vehicle charging

[0078]

[0079] Furthermore, since the mobile energy storage battery 1 is charged via the same car charger adapter 2, the vehicle start-up state correction module 143 can calibrate the internal resistance of the car charger adapter 2 at the start of charging to obtain... Then, when the current voltage of the charging port 3 is less than the starting voltage of the car battery 4, the current corrected voltage of the charging port 3 is directly calculated according to formula (3). For example, in the 9th sampling, the car start-up status judgment module 142 calculates the current voltage of the charging port 3. The voltage is significantly lower than the starting voltage of the car battery 4, while the car starting state correction module 143 can calculate the current correction voltage of the charging port 3. The charging switch circuit 15 is turned on to charge the battery pack 11.

[0080] Compared with existing technologies, this invention provides a method for automatic car charging of a mobile energy storage battery, and a mobile energy storage battery for automatic car charging. By detecting the current voltage at the charging port, the invention quickly determines the vehicle's starting status and charges the mobile energy storage battery when the vehicle starts, achieving the effect of automatic car charging maintenance and protection of the vehicle battery in mobile scenarios. Furthermore, this invention considers the influence of the internal resistance of the car charger adapter and further calculates the current corrected voltage at the charging port, improving the accuracy of determining the vehicle's starting status. This effectively solves the problem of over-discharging the vehicle battery during mobile energy storage charging, which can prevent the vehicle from starting normally, bringing convenience to mobile travel. In addition, stopping charging when the mobile energy storage battery reaches the target charge level avoids overcharging and serious damage, and helps to save energy.

[0081] The embodiments described above are merely examples of several implementations of the present invention, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention.

Claims

1. A mobile energy storage battery for an automatic car charger, characterized in that: It includes a control unit, a vehicle charging voltage and current sampling circuit, a charging switch circuit, and a battery pack that are electrically connected to the vehicle's charging port; wherein, the control unit includes a vehicle start-up status determination module; The vehicle start-up status determination module obtains the current voltage of the vehicle charging port detected by the vehicle charging voltage and current sampling circuit, and determines the corresponding start-up voltage of the vehicle battery based on the current voltage of the vehicle charging port. Then it determines whether the current voltage of the vehicle charging port is greater than or equal to the start-up voltage of the vehicle battery. When the current voltage of the vehicle charging port is greater than or equal to the start-up voltage of the vehicle battery, it controls the charging switch circuit to be turned on to charge the battery pack. The mobile energy storage battery is connected to the car charger port via a car charger adapter plug, and the control unit also includes a car start-up status correction module; When the vehicle start-up status determination module determines that the current voltage of the charging port is less than the start-up voltage of the vehicle battery, the vehicle start-up status correction module acquires the current voltage and current of the two charging ports detected by the charging voltage and current sampling circuit at different power levels. Then, based on the current voltage and current of the two charging ports, it directly calculates the internal resistance of the charging adapter and the current corrected voltage of the charging port, and determines whether the current corrected voltage of the charging port is greater than or equal to the start-up voltage of the vehicle battery. When the current corrected voltage of the charging port is greater than or equal to the start-up voltage of the vehicle battery, it controls the charging switch circuit to be turned on to charge the battery pack. When the current corrected voltage of the charging port is less than the start-up voltage of the vehicle battery, it controls the charging switch circuit to be turned off to prevent charging of the battery pack.

2. The mobile energy storage battery for the automatic car charger according to claim 1, characterized in that: The vehicle charger voltage and current sampling circuit includes a first voltage sampling resistor, a second voltage sampling resistor, a current sampling resistor, and an operational amplifier. The first voltage sampling resistor, the second voltage sampling resistor, and the current sampling resistor are connected in series and electrically connected to the vehicle charger port via the vehicle charger adapter. An AD sampling port of the control unit is connected in series between the first voltage sampling resistor and the second voltage sampling resistor, allowing direct acquisition of the voltage division value across the first voltage sampling resistor. The operational amplifier is connected in parallel with the current sampling resistor, directly acquiring and amplifying the voltage across the current sampling resistor before transmitting it to an AD sampling port of the control unit. The control unit can calculate the current value flowing through the current sampling resistor based on the amplified voltage value across the current sampling resistor, thereby obtaining the current value of the vehicle charger port.

3. The mobile energy storage battery for the automatic car charger according to claim 2, characterized in that: The formula for calculating the current voltage of the car charger port is: （4） In the formula, The current voltage of the car charger port. This is the voltage divider signal across the first voltage sampling resistor. The resistance value of the first voltage sampling resistor. The resistance value of the first voltage sampling resistor.

4. The mobile energy storage battery for an automatic car charger according to any one of claims 1 to 3, characterized in that: The mobile energy storage battery also includes a mobile energy storage battery power detection circuit that is electrically connected to an AD sampling port of the battery pack and the control unit respectively, and the control unit also includes a mobile energy storage battery power judgment module; The mobile energy storage battery power detection circuit detects the relevant circuit parameters of the battery pack and transmits the relevant circuit parameters of the battery pack to an AD sampling port of the control unit; the mobile energy storage battery power judgment module determines that the mobile energy storage battery is connected to the car charger port through the car charger adapter plug, and at the same time calculates the current power of the battery pack based on the collected relevant circuit parameters of the battery pack, and determines whether the current power of the mobile energy storage battery is less than or equal to its target power. When the current charge of the mobile energy storage battery is greater than its target charge, the charging switch circuit is controlled to cut off the charging of the battery pack; when the current charge of the mobile energy storage battery is less than or equal to its target charge, the vehicle start status judgment module is triggered to work.

5. The mobile energy storage battery for the automatic car charger according to claim 4, characterized in that: The control unit is a microcontroller, and the charging switch circuit is a boost circuit.

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