Electric vehicle battery recharging system, method and vehicle

Abstract

The application relates to a power supplementing system and method of an electric vehicle battery and a vehicle, which comprises a vehicle information and entertainment terminal, a vehicle body domain controller, an ambient temperature sensor, a power battery pack and a battery management system assembly, a vehicle body controller, a direct-current converter, a battery and a mobile phone terminal; the vehicle information and entertainment terminal is connected with the battery, the vehicle information and entertainment terminal is connected with the vehicle body domain controller and the mobile phone terminal respectively; the ambient temperature sensor is connected with the vehicle body domain controller; the vehicle body controller, the power battery pack and the battery management system assembly, the direct-current converter and the vehicle body domain controller are connected; the direct-current converter is connected with the battery; the vehicle information and entertainment terminal is internally provided with a corresponding relation table of different types of batteries and power supplementing threshold values, the types of the batteries are set, and the power supplementing threshold values corresponding to the batteries are automatically matched according to the types of the batteries. The application can provide adaptive power supplementing threshold values for different types of batteries, ensure accurate power supplementing time and avoid shortening of the service life of the batteries.

Description

Technical Field

[0001] This invention belongs to the field of automotive battery control technology, specifically relating to a charging system, method, and vehicle for electric vehicle batteries. Background Technology

[0002] With the increasing popularity and intelligence of new energy electric vehicles, more and more intelligent configurations and functions are being added. Even when the vehicle's power is in the OFF position and in sleep mode, these intelligent features typically still consume battery power. When the vehicle is parked for an extended period, the battery may become depleted, preventing the vehicle from starting. In this case, the battery must be replaced or an external power source must be used to restart the vehicle, resulting in a poor user experience. Furthermore, prolonged periods of low charge can easily cause internal sulfation and damage to the battery. Therefore, it is necessary to recharge the battery promptly when its charge is low.

[0003] Currently, most new energy electric vehicles use controllers to detect the battery's terminal voltage. When the battery voltage is less than or equal to a set voltage threshold, the controller sends a request signal for the high-voltage system to replenish the battery. For example, patent document CN213948356U discloses a smart battery replenishment system for new energy electric vehicles, including a battery terminal voltage detection and control unit, a high-voltage control module HVCM, a vehicle controller VCU, a high-voltage battery management system BMS, and a DC-DC converter. The battery terminal voltage detection and control unit is handled by a TBOX. The TBOX periodically wakes up to detect the battery's terminal voltage and determines whether it is low on charge. If the terminal voltage is lower than a set threshold, the TBOX sends a smart replenishment command, the HVCM is woken up by the network, and simultaneously outputs a hard-wired wake-up signal to wake up the VCU, BMS, and DC-DC converter. After receiving the hard-wired wake-up signal from the HVCM, the VCU determines whether the smart replenishment conditions are met and executes the high-voltage power-on process, enabling the DC-DC converter to replenish the battery. When the replenishment current is lower than a set threshold, the VCU sends a smart replenishment completion command and executes the high-voltage power-off process. After the smart replenishment is completed, each controller sequentially goes into sleep mode. For example, patent document CN11589186A discloses a battery charging control method, device, equipment, and storage medium. Battery terminal voltage detection is handled by the TBOX, while battery charging control is handled by the vehicle controller. When the vehicle controller receives a battery charging command from the TBOX, it outputs a high-level wake-up signal to wake up the battery management system and controls the battery management system to execute the vehicle power-on process before charging the battery via a DC / DC converter. When the battery terminal voltage reaches the charging cutoff voltage, the vehicle controller controls the DC / DC converter to stop charging the battery and controls the battery management system to execute the vehicle power-off process.

[0004] The above two intelligent battery charging methods have the following drawbacks:

[0005] 1. The battery charging threshold is singular. When users replace the battery with different types (ordinary lead-acid battery, EFB battery, AGM battery) later, they cannot select the appropriate battery threshold, resulting in inaccurate battery charging timing and shortening battery life.

[0006] 2. At low temperatures, the energy consumption of the vehicle is significantly reduced when charging the battery. At low temperatures, the battery charging efficiency is low, and it takes a long time for the charging current to fall below the set value or for the battery voltage to reach the charging cutoff voltage. During this process, the high-voltage system will be continuously charging the battery, resulting in a significant loss of the vehicle's driving range.

[0007] Therefore, it is necessary to develop a new charging system, method, and vehicle for electric vehicle batteries. Summary of the Invention

[0008] The purpose of this invention is to provide a charging system, method, and vehicle for electric vehicle batteries, which can provide suitable charging thresholds for different types of batteries to ensure accurate charging timing and avoid shortening battery life.

[0009] In a first aspect, the present invention provides a battery charging system for an electric vehicle, comprising an in-vehicle infotainment terminal, a vehicle domain controller, an ambient temperature sensor, a power battery pack and battery management system assembly, a vehicle controller, a DC-DC converter, a battery, and a mobile phone; the in-vehicle infotainment terminal is connected to the battery via a hardwired connection, and the in-vehicle infotainment terminal establishes a communication connection with the vehicle domain controller; the ambient temperature sensor is connected to the vehicle domain controller via a hardwired connection; the vehicle controller, the power battery pack and battery management system assembly, the DC-DC converter, and the vehicle domain controller establish a communication connection; the DC-DC converter is connected to the battery via a hardwired connection; and the in-vehicle infotainment terminal establishes a communication connection with the mobile phone.

[0010] The in-vehicle infotainment terminal has a table showing the correspondence between different types of batteries and charging thresholds. This table is used to set the type of battery and automatically match the corresponding charging threshold based on the type of battery.

[0011] The in-vehicle infotainment terminal is used to detect the battery voltage at a first preset time interval, and when the voltage is lower than the charging threshold, it sends a charging request signal to the vehicle domain controller and wakes up the vehicle.

[0012] The vehicle domain controller is used to obtain an ambient temperature signal from an ambient temperature sensor and send it to the in-vehicle infotainment terminal after receiving a power replenishment request signal, as well as to forward the power replenishment request signal.

[0013] The in-vehicle infotainment terminal is also used to receive ambient temperature signals and match the corresponding target charging time based on the ambient temperature.

[0014] After receiving a power replenishment request signal, the vehicle body controller determines that the conditions for applying high voltage and enabling the DC-DC converter are met. It then controls the power battery pack and battery management system assembly to apply high voltage, connect the DC-DC converter, and enter the intelligent power replenishment mode to replenish the battery.

[0015] The in-vehicle infotainment terminal is also used to issue a charging completion signal when it is determined that the charging time of the battery has reached the target charging time. The body controller controls the power battery pack and battery management system assembly and DC converter to disconnect the high voltage connection based on the charging completion signal.

[0016] The in-vehicle infotainment terminal is also used to record the number of times the battery is replenished; and when the preset number of battery replenishments is reached within a second preset time, a prompt indicating frequent battery replenishment is issued;

[0017] The mobile device is used to interact with the in-vehicle infotainment terminal, to receive and display information sent by the vehicle terminal, and to set the type of battery.

[0018] Optionally, the battery is a 12V battery.

[0019] Optionally, the table showing the correspondence between different types of batteries and their charging thresholds includes:

[0020] It includes at least lead-acid batteries and their charging thresholds, EFB batteries and their charging thresholds, and AGM batteries and their charging thresholds.

[0021] Optionally, the correspondence between different ambient temperatures and target charging time is as follows:

[0022] When the ambient temperature is above 0℃, the target charging time is 40 minutes.

[0023] When the ambient temperature is 0℃ or below, the target charging time is 60 minutes; the charging time at low temperatures is set to 1 hour to avoid prolonged charging of the battery and loss of driving range.

[0024] Secondly, the electric vehicle battery charging method of the present invention employs the electric vehicle battery charging system as described in the present invention, and the charging method includes the following steps:

[0025] S1: The in-vehicle infotainment terminal obtains the type of battery and matches the corresponding charging threshold based on the type of battery.

[0026] S2: When the vehicle is in a dormant state, the in-vehicle infotainment terminal wakes up and detects the battery voltage according to the first preset time interval. If the voltage is higher than the charging threshold, this step is repeated; otherwise, step S3 is executed.

[0027] S3: The in-vehicle infotainment terminal sends a power replenishment request signal to the vehicle domain controller and wakes up the entire vehicle;

[0028] S4: The vehicle domain controller sends an ambient temperature signal and forwards a power replenishment request signal;

[0029] S5: The in-vehicle infotainment terminal identifies the ambient temperature and matches the corresponding target charging time based on the ambient temperature;

[0030] S6: After receiving the power replenishment request signal, the body controller determines whether the high voltage conditions are met. If not, the body controller sends a high voltage failure message and the vehicle goes into sleep mode. If the conditions are met, step S7 is executed.

[0031] S7: The body controller determines whether the conditions for enabling the DC-DC converter are met. If not, the body controller sends a message indicating that enabling the DC-DC converter has failed, and the vehicle goes into sleep mode. If the conditions are met, then step S8 is executed.

[0032] S8: The high voltage of the power battery pack and battery management system assembly is connected to the DC-DC converter, and the intelligent charging mode is entered to charge the battery, and step S9 is executed.

[0033] S9: The in-vehicle infotainment terminal determines whether the target charging time has been reached. If the target charging time has not been reached, this step continues. When the target charging time is reached, step S10 is executed.

[0034] S10: The in-vehicle infotainment terminal sends a power replenishment completion signal. After receiving the signal, the body controller controls the power battery pack, battery management system assembly and DC-DC converter to disconnect the high voltage connection.

[0035] S11: The in-vehicle infotainment terminal records and determines the number of times the battery needs to be replenished. If the preset number of battery replenishments is reached within the second preset time, a prompt for frequent battery replenishment is sent to the mobile phone and the whole vehicle goes into sleep mode. If the requirement is not met, the whole vehicle goes into sleep mode directly.

[0036] Optionally, step S1 specifically includes:

[0037] During vehicle debugging or when replacing the battery, switch the vehicle's power status to ON; set the battery type through the in-vehicle infotainment terminal or mobile app; the in-vehicle infotainment terminal looks up the correspondence table between different battery types and charging thresholds to obtain the corresponding charging threshold for that battery.

[0038] Thirdly, the vehicle described in this invention employs a battery charging system for electric vehicles as described in this invention.

[0039] The present invention has the following advantages:

[0040] (1) This invention provides a variety of common battery types (including at least ordinary lead-acid batteries, EFB batteries, and AGM batteries) to choose from, that is, it can provide suitable charging thresholds for different types of batteries, ensuring accurate charging timing and avoiding shortened battery life. At the same time, the entire charging system can also interact with a mobile phone. For example, the type of battery can be set through the mobile phone, and relevant information about the charging process can be sent to the mobile phone for display, so that users can understand the status of the system in real time. At the same time, relevant parameters can be set through the mobile phone, which is convenient for users to operate and improves the intelligence of the system.

[0041] (2) The present invention can match the corresponding charging time according to the environmental problem, which can avoid insufficient charging of the battery and avoid loss of driving range due to prolonged charging of the battery.

[0042] (3) The present invention sets the charging time at low temperature to 1 hour, which can avoid the loss of driving range due to prolonged charging of the battery. Attached Figure Description

[0043] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0044] Figure 1 This is a schematic diagram of the charging system for the electric vehicle battery described in this embodiment.

[0045] Figure 2 This is a flowchart of the electric vehicle battery charging method described in this embodiment;

[0046] Figure 3 This is the charging curve of the battery in this embodiment when the charging voltage is 14.5V above 0°C;

[0047] Figure 4 This is the charging curve of the battery at 0°C and below when the charging voltage is 14.5V in this embodiment;

[0048] In the diagram: 1. In-vehicle infotainment terminal, 2. Body domain controller, 3. Ambient temperature sensor, 4. Power battery pack and battery management system assembly, 5. Body controller, 6. DC-DC converter, 7. Battery, 8. Mobile terminal. Detailed Implementation

[0049] Embodiments of this application will now be described in more detail with reference to the accompanying drawings. While some embodiments of this application are shown in the drawings, it should be understood that this application can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided to provide a more thorough and complete understanding of this application. It should be understood that the drawings and embodiments of this application are for illustrative purposes only and are not intended to limit the scope of protection of this application.

[0050] like Figure 1 As shown, in this embodiment, a battery charging system for an electric vehicle includes an in-vehicle infotainment terminal 1, a vehicle domain controller 2, an ambient temperature sensor 3, a power battery pack and battery management system assembly 4, a vehicle controller 5, a DC-DC converter 6, a battery 7, and a mobile phone terminal 8. The in-vehicle infotainment terminal 1 is hardwired to the battery 7, and the in-vehicle infotainment terminal 1 establishes a communication connection with the vehicle domain controller 2. The ambient temperature sensor 3 is hardwired to the vehicle domain controller 2. The vehicle controller 5, the power battery pack and battery management system assembly 4, the DC-DC converter 6, and the vehicle domain controller 2 establish a communication connection. The DC-DC converter 6 is hardwired to the battery 7. The in-vehicle infotainment terminal 1 establishes a communication connection with the mobile phone terminal 8.

[0051] In this embodiment, the in-vehicle infotainment terminal 1 has a table showing the correspondence between different types of batteries and charging thresholds. This table is used to set the types of batteries 7 and automatically match the corresponding charging threshold based on the type of battery 7. The in-vehicle infotainment terminal 1 is used to detect the voltage of the battery 7 at a first preset time interval, and when the voltage is lower than the charging threshold, it sends a charging request signal to the vehicle domain controller 2 and wakes up the vehicle. The vehicle domain controller 2, upon receiving the charging request signal, obtains the ambient temperature signal from the ambient temperature sensor 3 and sends it to the in-vehicle infotainment terminal 1, as well as forwards the charging request signal. The in-vehicle infotainment terminal 1 is also used to receive the ambient temperature signal and match the corresponding target charging time based on the ambient temperature. After receiving the charging request signal, the vehicle controller 5, upon determining that the conditions for high voltage connection and DC-DC converter 6 are met, controls the power battery pack and battery management system assembly 4 to connect to high voltage, and the DC-DC converter 6 is connected, thus entering the intelligent charging mode to charge the battery 7. The in-vehicle infotainment terminal 1 is also used to issue a charging completion signal when it determines that the charging time of the battery 7 has reached the target charging time. Based on the charging completion signal, the body controller 5 controls the power battery pack and battery management system assembly 4 and the DC-DC converter 6 to disconnect the high-voltage connection. The in-vehicle infotainment terminal 1 is also used to record the number of charging attempts; and when the preset number of charging attempts is reached within a second preset time, a frequent charging prompt is issued. The mobile phone terminal 8 is used to interact with the in-vehicle infotainment terminal 1, to receive and display information sent by the vehicle terminal and to set the type of battery.

[0052] In this embodiment, the battery 7 is a 12V battery.

[0053] In this embodiment, the table showing the correspondence between different types of batteries and charging thresholds is as follows:

[0054] It includes at least lead-acid batteries and their charging thresholds, EFB batteries and their charging thresholds, and AGM batteries and their charging thresholds.

[0055] like Figure 1 As shown in this embodiment, the in-vehicle infotainment terminal 1 has a table showing the correspondence between different ambient temperatures and target charging times; the in-vehicle infotainment terminal 1 looks up the table showing the correspondence between different ambient temperatures and target charging times according to the ambient temperature to obtain the target charging time of the battery 7 at the current ambient temperature.

[0056] like Figure 2 As shown, in this embodiment, a method for replenishing the power of an electric vehicle battery employs the electric vehicle battery replenishment system described in this embodiment, and the replenishment method includes the following steps:

[0057] S1: The in-vehicle infotainment terminal 1 obtains the type of battery and matches the corresponding charging threshold according to the type of battery.

[0058] This step is only performed by OEM assembly personnel during vehicle debugging or by the user after battery replacement. This step is ignored after setup is complete. Switch the vehicle's power status to ON, turn on the display screen of the in-vehicle infotainment terminal 1, locate the battery type selection interface 7, and select lead-acid, EFB, or AGM battery according to the actual battery type used, then confirm. Specifically, after the user selects the battery type, the in-vehicle infotainment terminal 1 uses the corresponding charging threshold (12.3V for ordinary lead-acid batteries, 12.1V for EFB batteries, and 11.8V for AGM batteries) as the charging judgment condition. Alternatively, the battery type 7 can also be set on the mobile phone interface 8.

[0059] S2: When the vehicle is in a dormant state, the in-vehicle infotainment terminal 1 wakes up and detects the voltage of the battery 7 at a first preset time interval (for example, wakes up and detects the voltage of the battery 7 every two hours). If the voltage is higher than the charging threshold, this step is repeated. If the voltage is less than or equal to the charging threshold, step S3 is executed.

[0060] S3: The in-vehicle infotainment terminal 1 sends a power replenishment request signal to the vehicle domain controller 2 and wakes up the entire vehicle.

[0061] S4: The vehicle domain controller 2 sends an ambient temperature signal and forwards a power replenishment request signal.

[0062] S5: The in-vehicle infotainment terminal 1 identifies the ambient temperature and matches the corresponding target charging time based on the ambient temperature; specifically:

[0063] The in-vehicle infotainment terminal 1 obtains the target charging time of the battery at the current ambient temperature by looking up a table showing the correspondence between different ambient temperatures and target charging times.

[0064] The table showing the correspondence between different ambient temperatures and target charging times is as follows:

[0065] When the ambient temperature is above 0℃, the target charging time is 40 minutes.

[0066] When the ambient temperature is 0℃ or below, the target charging time is 60 minutes.

[0067] S6: After receiving the power replenishment request signal, the body controller 5 determines whether the high-voltage connection conditions are met. If not, the body controller 5 sends a high-voltage connection failure message on the network. The in-vehicle infotainment terminal 1 receives the high-voltage connection failure message and then sends it to the user's mobile phone. The entire vehicle then goes into sleep mode. If the conditions are met, step S7 is executed.

[0068] S7: The body controller 5 determines whether the conditions for enabling the DC-DC converter 6 are met. If not, the body controller 5 sends a message on the network indicating that enabling the DC-DC converter 6 has failed. The in-vehicle infotainment terminal 1 receives the message and then sends it to the user's mobile phone. The vehicle then goes into sleep mode. If the conditions are met, step S8 is executed.

[0069] S8: The power battery pack and battery management system assembly 4 is connected to high voltage and DC-DC converter 6, which means it enters the intelligent charging mode to charge the battery and executes step S9.

[0070] S9: The in-vehicle infotainment terminal 1 determines whether the charging time has been reached. If the charging time has not been reached, this step continues. When the charging time has been reached, step S10 is executed.

[0071] S10: The in-vehicle infotainment terminal 1 sends a power replenishment completion signal. Upon receiving the signal, the body controller 5 controls the power battery pack and battery management system assembly 4 and the DC-DC converter 6 to disconnect the high-voltage connection.

[0072] S11: The in-vehicle infotainment terminal 1 records and determines the number of times the battery needs to be replenished. If the preset number of battery replenishments is reached within a second preset time (e.g., 3 battery replenishments within 48 hours), a frequent battery replenishment prompt is sent to the mobile phone, and then the entire vehicle goes into sleep mode. If the conditions are not met, the entire vehicle goes into sleep mode directly.

[0073] Table 1 shows the cycle life of the three types of batteries under different SOCs.

[0074] Specific implementation method: Different types of batteries have different cycle lives at different SOCs. To ensure that the cycle life of the battery meets the design requirements, it is necessary to select different SOCs for charging different types of batteries. Different SOCs correspond to different terminal voltages. For ordinary lead-acid batteries, the voltage value corresponding to 80% SOC, i.e., 12.3V, is usually selected as the charging threshold voltage; for EFB batteries, the voltage value corresponding to 60% SOC, i.e., 12.1V, is usually selected as the charging threshold voltage; and for AGM batteries, the voltage value corresponding to 50% SOC, i.e., 11.8V, is usually selected as the charging threshold voltage.

[0075] For example: the cycle life of three types of batteries under different SOCs:

[0076]

[0077] like Figure 3 The figure shows the charging curve of the battery when the charging voltage is 14.5V above 0℃.

[0078] Specific implementation method: When the charging voltage is 14.5V above 0℃, the charging efficiency is relatively high, and the battery capacity no longer increases after 40 minutes of charging. Therefore, when the ambient temperature is above 0℃, the charging time is set to 40 minutes.

[0079] like Figure 4 The figure shows the charging curve of the battery at 0℃ and below when the charging voltage is 14.5V.

[0080] Specific implementation method: When the charging voltage is 14.5V at or below 0℃, the battery charging efficiency is very low, and the battery capacity no longer increases after 60 minutes of charging. Therefore, when the ambient temperature is 0℃ or below, the charging time should be set to 60 minutes.

[0081] In this embodiment, a vehicle employs a battery charging system for an electric vehicle as described in this embodiment.

[0082] The above embodiments are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the above embodiments. Any changes, modifications, substitutions, combinations, or simplifications made without departing from the spirit and principle of the present invention shall be considered equivalent substitutions and shall be included within the protection scope of the present invention.

Claims

1. A charging system for an electric vehicle battery, characterized in that: The system includes an in-vehicle infotainment terminal (1), a vehicle domain controller (2), an ambient temperature sensor (3), a power battery pack and battery management system assembly (4), a vehicle controller (5), a DC-DC converter (6), a battery (7), and a mobile phone (8). The in-vehicle infotainment terminal (1) is connected to the battery (7) via a hardwired connection, and the in-vehicle infotainment terminal (1) establishes a communication connection with the vehicle domain controller (2). The ambient temperature sensor (3) is connected to the vehicle domain controller (2) via a hardwired connection. The vehicle controller (5), the power battery pack and battery management system assembly (4), the DC-DC converter (6), and the vehicle domain controller (2) establish a communication connection. The DC-DC converter (6) is connected to the battery (7) via a hardwired connection. The in-vehicle infotainment terminal (1) establishes a communication connection with the mobile phone (8). The in-vehicle infotainment terminal (1) is equipped with a table showing the correspondence between different types of batteries and charging thresholds, which is used to set the type of battery (7) and automatically match the charging threshold corresponding to the battery according to the type of battery (7). The in-vehicle infotainment terminal (1) is used to detect the voltage of the battery (7) according to a first preset time interval, and send a power replenishment request signal to the vehicle domain controller (2) when the voltage is lower than the power replenishment threshold, and wake up the whole vehicle; The vehicle domain controller (2) is used to obtain an ambient temperature signal from the ambient temperature sensor (3) and send it to the in-vehicle infotainment terminal (1) after receiving the power replenishment request signal, and to forward the power replenishment request signal. The in-vehicle infotainment terminal (1) is also used to receive ambient temperature signals and match the corresponding target charging time according to the ambient temperature; After receiving the power replenishment request signal, the vehicle body controller (5) determines that the conditions for high voltage and DC-DC converter (6) are met, controls the power battery pack and battery management system assembly (4) to connect to high voltage, and the DC-DC converter (6) is connected, and enters the intelligent power replenishment mode to replenish the battery (7). The in-vehicle infotainment terminal (1) is also used to issue a charging completion signal when it is determined that the charging time of the battery (7) has reached the target charging time. The body controller (5) controls the power battery pack and battery management system assembly (4) and DC converter (6) to disconnect the high voltage connection based on the charging completion signal. The in-vehicle infotainment terminal (1) is also used to record the number of times the battery is replenished, and when the preset number of times the battery is replenished is reached within a second preset time, a prompt of frequent battery replenishment is issued; The mobile terminal (8) is used to interact with the in-vehicle infotainment terminal (1) to receive and display information sent by the vehicle terminal and to set the type of battery. The in-vehicle infotainment terminal (1) is equipped with a table showing the correspondence between different ambient temperatures and target charging times. The in-vehicle infotainment terminal (1) looks up the table showing the correspondence between different ambient temperatures and target charging times to obtain the target charging time of the battery at the current ambient temperature. When the ambient temperature is above 0°C, the target charging time is 40 minutes. When the ambient temperature is 0°C or below, the target charging time is 60 minutes. When debugging the vehicle or replacing the battery, switch the vehicle's power status to ON.

2. The electric vehicle battery charging system according to claim 1, characterized in that: The battery (7) is a 12V battery.

3. The electric vehicle battery charging system according to claim 1, characterized in that: The table showing the correspondence between different types of batteries and their charging thresholds is as follows: It includes at least lead-acid batteries and their charging thresholds, EFB batteries and their charging thresholds, and AGM batteries and their charging thresholds.

4. A method for charging an electric vehicle battery, characterized in that: The electric vehicle battery charging system as described in any one of claims 1 to 3 includes the following steps: S1: The in-vehicle infotainment terminal (1) obtains the type of battery and matches the corresponding charging threshold according to the type of battery. S2: When the vehicle is in a dormant state, the in-vehicle infotainment terminal (1) wakes up and detects the voltage of the battery (7) according to the first preset time interval. If the voltage is not lower than the charging threshold, this step is repeated; otherwise, step S3 is executed. S3: The in-vehicle infotainment terminal (1) sends a power replenishment request signal to the vehicle domain controller (2) and wakes up the whole vehicle; S4: The vehicle domain controller (2) sends an ambient temperature signal and forwards a power replenishment request signal; S5: The in-vehicle infotainment terminal (1) identifies the ambient temperature and matches the corresponding target charging time based on the ambient temperature; S6: After receiving the power replenishment request signal, the body controller (5) determines whether the high voltage conditions are met. If not, the body controller (5) issues a high voltage failure message and the whole vehicle goes into hibernation. If the conditions are met, step S7 is executed. S7: The body controller (5) determines whether the conditions for enabling the DC-DC converter (6) are met. If not, the body controller (5) sends a message that the DC-DC converter (6) has failed to be enabled, and the whole vehicle goes into sleep mode. If the conditions are met, then step S8 is executed. S8: The power battery pack and battery management system assembly (4) is connected to a high voltage and a DC converter (6) is connected to enter the intelligent charging mode to charge the battery; S9: The in-vehicle infotainment terminal (1) determines whether the target charging time has been reached. If the target charging time has not been reached, this step continues. When the target charging time is reached, step S10 is executed. S10: The vehicle infotainment terminal (1) sends a power replenishment completion signal. After receiving the signal, the body controller (5) controls the power battery pack and battery management system assembly (4) and DC converter (6) to disconnect the high voltage connection. S11: The vehicle infotainment terminal (1) records and judges the number of times the power is replenished. If the preset number of power replenishments is reached within the second preset time, a prompt for frequent power replenishment is sent to the mobile phone (8) and the whole vehicle goes into sleep mode. If the condition is not met, the whole vehicle goes into sleep mode directly.

5. The method for replenishing the battery of an electric vehicle according to claim 4, characterized in that: Step S1 specifically involves: When the vehicle is being debugged or the battery is being replaced, the power status of the vehicle is switched to ON. The type of battery is set through the in-vehicle infotainment terminal (1) or mobile phone (8). The in-vehicle infotainment terminal (1) looks up the correspondence table between different types of batteries and the charging threshold according to the type of battery, and obtains the charging threshold corresponding to the battery (7).

6. A vehicle, characterized in that: The electric vehicle battery charging system described in any one of claims 1 to 3 is adopted.

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