Charging circuit, charging method and device of storage battery, vehicle and medium

Abstract

The invention discloses a charging circuit, a charging method and a charging device of a storage battery, a vehicle and a medium, and relates to the technical field of vehicles. The charging circuit is applied to a vehicle and comprises a reference voltage source, a hysteresis voltage comparator, a controller and a voltage converter, the first input end of the hysteresis voltage comparator is connected with the output end of the reference voltage source, and the second input end of the hysteresis voltage comparator is connected with the positive electrode of a storage battery. The output end of the hysteresis voltage comparator is connected with the input end of the controller; the output end of the controller is connected with the control end of the voltage converter; the voltage converter is connected between a positive electrode of a power battery and a positive electrode of a storage battery of the vehicle; under the condition that the actual voltage value of the storage battery is smaller than a first preset voltage value, the hysteresis voltage comparator outputs a preset level to the controller, and when the controller receives the preset level and determines that the vehicle is in a parking state, the voltage converter is controlled to be in a working state, and the storage battery is controlled to be in a charging state.

Description

Technical Field

[0001] The present application relates to the field of vehicle technology, and more specifically, to a battery charging circuit, charging method, device, vehicle, and medium. Background Art

[0002] When an electric vehicle is parked and turned off, the vehicle's high-voltage system loses power, and the vehicle's various electronic controller units (ECUs) rely on the onboard battery for power to maintain basic operations, including executing startup control, status monitoring, and other functions.

[0003] However, if an ECU experiences abnormal power consumption or the battery's storage capacity decreases due to performance degradation, a battery voltage shortfall may occur. This low battery voltage can affect the proper functioning of the EDU. For example, the EDU may lose the ability to start the vehicle due to the battery's supply voltage being too low.

[0004] Therefore, how to charge the battery when the battery voltage is insufficient becomes a technical problem that needs to be solved urgently. Summary of the Invention

[0005] One object of the present application is to provide a new technical solution for battery charging.

[0006] According to a first aspect of the present application, a battery charging circuit is provided, which is applied to a vehicle and includes: a reference voltage source, a hysteresis voltage comparator, a controller, and a voltage converter, wherein:

[0007] The first input terminal of the hysteresis voltage comparator is connected to the output terminal of the reference voltage source, the second input terminal of the hysteresis voltage comparator is connected to the positive electrode of the battery, and the output terminal of the hysteresis voltage comparator is connected to the input terminal of the controller;

[0008] The output terminal of the controller is connected to the control terminal of the voltage converter;

[0009] The voltage converter is connected between the positive electrode of the power battery of the vehicle and the positive electrode of the storage battery;

[0010] In which, the reference voltage source outputs a reference voltage of a reference voltage value to the hysteresis voltage comparator. When the actual voltage value of the battery is less than a first preset voltage value, the hysteresis voltage comparator outputs a preset level to the controller. When the controller receives the preset level and determines that the vehicle state is parked, the controller controls the voltage converter to be in an operating state, and the charging path formed by the positive electrode of the power battery, the voltage converter and the positive electrode of the battery is connected. The voltage converter converts the voltage value of the output voltage of the power battery into a charging voltage value of the battery. The battery is in a charging state, and the first preset voltage value is the lower threshold voltage value of the hysteresis voltage comparator.

[0011] Optionally, the controller includes a vehicle controller and a battery management system, wherein:

[0012] The input end of the vehicle controller is connected to the output end of the hysteresis voltage comparator, and the output end of the vehicle controller is connected to the input end of the battery management system;

[0013] The output terminal of the battery management system is connected to the control terminal of the voltage converter;

[0014] The hysteresis voltage comparator outputs a preset level to the vehicle controller. Upon receiving the preset level, the vehicle controller sends a charging instruction to the battery management system. The battery management system controls the voltage converter to be in an operating state according to the charging instruction.

[0015] Optionally, the charging circuit further includes a voltage sensor, wherein:

[0016] The first input end of the voltage sensor is connected to the positive electrode of the battery, the second input end of the voltage sensor is connected to the negative electrode of the battery, and the output end of the voltage sensor is connected to the controller;

[0017] In which, the voltage sensor is used to collect the actual voltage value of the battery. When the battery is in a charging state, the controller obtains the actual voltage value of the battery from the voltage sensor at a set time interval. When the actual voltage value is consistent with the actual theoretical voltage value corresponding to the current charging time, the controller continuously controls the voltage converter to be in a working state.

[0018] Optionally, the charging circuit further includes a prompting device, wherein:

[0019] The input end of the prompt device is connected to the controller. When the actual voltage value does not meet the preset voltage value corresponding to the current charging time, the controller controls the prompt device to output prompt information and controls the voltage converter to be in a non-working state.

[0020] Optionally, the battery charging circuit further includes a voltage sensor, wherein:

[0021] The first input end of the voltage sensor is connected to the positive electrode of the battery, the second input end of the voltage sensor is connected to the negative electrode of the battery, and the output end of the voltage sensor is connected to the controller;

[0022] In which, the voltage sensor is used to collect the actual voltage value of the battery. When the vehicle is in a parked and powered-off state and when the controller receives the preset level output by the hysteresis voltage comparator, the controller obtains the actual voltage value of the battery from the voltage sensor. When the actual voltage value is less than the first preset voltage value, the controller controls the voltage converter to be in an operating state.

[0023] According to a second aspect of the present application, a method for charging a battery is provided. The method is applied to the charging circuit according to any one of the first aspects, comprising:

[0024] Get the vehicle status of the vehicle;

[0025] When the vehicle is parked and powered off, and a preset level is output by a hysteresis voltage comparator in the charging circuit, controlling the voltage converter in the charging circuit to be in an operating state;

[0026] Among them, when the actual voltage value of the battery is less than the first preset voltage value, the hysteresis voltage comparator outputs a preset level, and when the voltage converter is in an operating state, the charging path between the positive electrode of the vehicle's power battery, the voltage converter and the positive electrode of the battery is connected, and the voltage converter converts the voltage value of the output voltage of the power battery into the charging voltage value of the battery. The battery is in a charging state, and the first preset voltage value is the lower threshold voltage value of the hysteresis voltage comparator.

[0027] Optionally, the method further includes:

[0028] When the battery is in a charging state, obtaining an actual voltage value of the battery from a voltage sensor in the charging circuit at set time intervals;

[0029] When the actual voltage value is consistent with the actual theoretical voltage value corresponding to the current charging duration, continuously controlling the voltage converter to be in an operating state;

[0030] And / or, when the actual voltage value does not meet the preset voltage value corresponding to the current charging duration, controlling the prompt device in the charging circuit to output prompt information, and controlling the voltage converter to be in a non-working state.

[0031] Optionally, when the vehicle is parked and powered off, and upon receiving a preset level output by a hysteresis voltage comparator in the charging circuit, controlling the voltage converter in the charging circuit to be in an operating state includes:

[0032] When the vehicle is parked and powered off, and a preset voltage level is output by a hysteresis voltage comparator in the charging circuit, an actual voltage value of the battery is obtained from a voltage sensor in the charging circuit;

[0033] When the actual voltage value is less than the first preset voltage value, the voltage converter is controlled to be in an operating state.

[0034] Optionally, acquiring the actual voltage value of the battery from a voltage sensor in the charging circuit includes:

[0035] controlling the voltage converter to be in a non-operating state;

[0036] When the voltage converter is in a non-operating state, obtaining an actual voltage value of the battery from a voltage sensor in the charging circuit;

[0037] When the voltage sensor obtains the actual voltage value of the battery, the voltage converter is controlled to resume the working state.

[0038] Optionally, the method further includes:

[0039] When the actual voltage value acquired from the voltage sensor in the charging circuit is greater than or equal to a second preset voltage value, the voltage converter is controlled to be in a non-operating state.

[0040] According to a third aspect of the present application, a battery charging device is provided, the device being applied to the charging circuit as described in any one of the first aspects, comprising:

[0041] An acquisition module, used to obtain the vehicle status of the vehicle;

[0042] a control module, configured to control a voltage converter in the charging circuit to be in an operating state when the vehicle is in a parked state and the vehicle is powered off and a preset level is output by a hysteresis voltage comparator in the charging circuit;

[0043] Among them, when the actual voltage value of the battery is less than the first preset voltage value, the hysteresis voltage comparator outputs a preset level, and when the voltage converter is in an operating state, the charging path between the positive electrode of the vehicle's power battery, the voltage converter and the positive electrode of the battery is connected, and the voltage converter converts the voltage value of the output voltage of the power battery into the charging voltage value of the battery. The battery is in a charging state, and the first preset voltage value is the lower threshold voltage value of the hysteresis voltage comparator.

[0044] According to a fourth aspect of the present application, a vehicle is provided, comprising the device according to the third aspect;

[0045] Alternatively, it comprises the charging circuit as described in any one of the first aspects;

[0046] Alternatively, the vehicle includes a memory and a processor, the memory being used to store computer instructions, and the processor being used to call the computer instructions from the memory to execute the method as described in any one of the second aspects.

[0047] According to a fifth aspect of the present application, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the method according to any one of the second aspects is implemented.

[0048] The present application provides a battery charging circuit for use in a vehicle, comprising: a reference voltage source, a hysteresis voltage comparator, a controller, and a voltage converter, wherein: a first input terminal of the hysteresis voltage comparator is connected to an output terminal of the reference voltage source, a second input terminal of the hysteresis voltage comparator is connected to a positive electrode of a battery, and an output terminal of the hysteresis voltage comparator is connected to an input terminal of the controller; an output terminal of the controller is connected to a control terminal of the voltage converter; and the voltage converter is connected between a positive electrode of a power battery of the vehicle and a positive electrode of the battery; wherein the reference voltage source outputs a reference voltage of a reference voltage value to the hysteresis voltage comparator; when an actual voltage value of the battery is less than a first preset voltage value, the hysteresis voltage comparator outputs a preset voltage level to the controller; and when the controller receives the preset voltage level and determines that the vehicle is parked, the controller controls the voltage converter to be in an operating state, connects a charging path formed by the positive electrode of the power battery, the voltage converter, and the positive electrode of the battery, and converts the voltage value of the output voltage of the power battery into a charging voltage value of the battery. The battery is in a charging state, and the first preset voltage value is a lower threshold voltage value of the hysteresis voltage comparator. Through the battery charging circuit provided in this application, the power battery can charge the battery when the entire vehicle is powered off and the actual voltage value of the battery is less than the first preset voltage value, thereby ensuring that the battery can normally power the vehicle's ECU.

[0049] Other features and advantages of the present application will become apparent from the following detailed description of exemplary embodiments of the present application with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the application and, together with the description, serve to explain the principles of the application.

[0051] Figure 1 This is a schematic diagram of the structure of a battery charging circuit provided by this application Figure 1 ;

[0052] Figure 2 This is a schematic diagram of the structure of a reference voltage source and a hysteresis voltage comparator provided by the present application;

[0053] Figure 3 This is a schematic diagram of the structure of a battery charging circuit provided by this application Figure 2 ;

[0054] Figure 4 This is a schematic diagram of the structure of a battery charging circuit provided by this application Figure 3 ;

[0055] Figure 5 This is a flow chart of a battery charging method provided by the present application;

[0056] Figure 6 This is a schematic structural diagram of a battery charging device provided by the present application;

[0057] Figure 7 It is a structural schematic diagram of a vehicle provided by this application. DETAILED DESCRIPTION

[0058] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangements of components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present application.

[0059] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present disclosure, its application, or uses.

[0060] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0061] In all examples shown and discussed herein, any specific values should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0062] It should be noted that like reference numerals and letters refer to like items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0063] The present application provides a battery charging circuit 100 for a vehicle, specifically an electric vehicle, such as a pure electric vehicle or a hybrid vehicle including an electric power source.

[0064] like Figure 1 As shown, the charging circuit 100 provided in this application includes: a reference voltage source 101, a hysteresis voltage comparator 102, a controller 103 and a voltage converter 104, wherein:

[0065] A first input terminal of the hysteresis voltage comparator 102 is connected to the output terminal of the reference voltage source 101 , a second input terminal of the hysteresis voltage comparator 102 is connected to the positive electrode of the battery 200 , and an output terminal of the hysteresis voltage comparator is connected to an input terminal of the controller 103 ;

[0066] The output terminal of the controller 103 is connected to the control terminal of the voltage converter 104;

[0067] The voltage converter 104 is connected between the positive electrode of the vehicle's power battery 300 and the positive electrode of the storage battery 200;

[0068] Among them, the reference voltage source 101 outputs a reference voltage of a reference voltage value to the hysteresis voltage comparator 102. When the actual voltage value of the battery 200 is less than the first preset voltage value, the hysteresis voltage comparator 102 outputs a preset level to the controller 103. When the controller 103 receives the preset level and determines that the vehicle status is parked and powered off, it controls the voltage converter 104 to be in an operating state. The charging path formed by the positive electrode of the power battery 300, the voltage converter 104 and the positive electrode of the battery 200 is connected. The voltage converter 104 converts the output voltage value of the power battery 300 into a charging voltage value of the battery 200. The battery 200 is in a charging state. The first preset voltage value is the lower threshold voltage value of the hysteresis voltage comparator 102.

[0069] In this embodiment, the reference voltage source 101 is used to output a reference voltage of a reference voltage value to the hysteresis voltage comparator 102. In one example, Figure 2As shown, the reference voltage source 101 is composed of a resistor R3 and a reference voltage source chip U2, wherein the power output end of the external power supply VCC, the resistor R3, the anode pin A of the reference voltage source chip U2, the cathode pin K of the reference voltage source chip U2 and the ground end are connected in series in sequence, one end of the resistor R3 connected to the anode pin A of the reference voltage source chip U2 is connected to the voltage output end of the reference voltage source chip U2, and the voltage output end of the reference voltage source 101 chip U2 serves as the output end of the reference voltage source 101.

[0070] The hysteresis voltage comparator 102 is specifically a hysteresis voltage comparator 102 with a reference voltage signal, including a non-inverting input hysteresis voltage comparator 102 and an inverting input hysteresis voltage comparator 102. The output of the hysteresis voltage comparator 102 is usually connected to a level interrupt pin of the controller 103.

[0071] Take the hysteresis voltage comparator 102 with the inverting input as an example for explanation. Figure 2 As shown, the hysteresis voltage comparator 102 includes a voltage comparator U1, a resistor R1, a resistor R2, a resistor R4, and a resistor R5. The first end of the resistor R4 is connected to the inverting input of the voltage comparator U1, and the second end of the resistor R4 serves as the second input of the hysteresis voltage comparator 102. The resistor R5 is connected between the inverting input of the voltage comparator U1 and the ground. The first end of the resistor R1 serves as the first input of the hysteresis voltage comparator 102, and the second end of the resistor R1 is connected to the non-inverting input of the voltage comparator U1. The resistor R2 is connected between the output of the voltage comparator U1 and the non-inverting input of the voltage comparator. The output of the voltage comparator U1 serves as the output of the hysteresis voltage comparator 102. It is understood that the voltage comparator U1 also includes a power supply terminal and a ground terminal. The power supply terminal of the voltage comparator U1 is used to connect to an external power supply VCC, and the ground terminal of the voltage comparator U1 is used for grounding.

[0072] For example Figure 2 The hysteresis voltage comparator 102 shown in FIG. 1 has a hysteresis difference ΔU determined according to the following formula (1):

[0073]

[0074] Among them, V CC is the output voltage of the external power supply VCC, R1 is the resistance of the resistor R1, and R2 is the resistance of the resistor R2. In one example, ΔU can be specifically set to 0.5V.

[0075] The lower threshold voltage value U of the hysteresis voltage comparator 102 is L Determine according to the following formula 2:

[0076]

[0077] Among them, V REF is the reference voltage value of the reference voltage output by the reference voltage source 101. In one example, V REF The specific value can be 2.5V.

[0078] Based on the above formula 1 and formula 2, the actual voltage value of the battery 200 decreases due to discharge and is less than the lower threshold voltage value U L When the voltage level of the hysteresis voltage comparator 102 is flipped from low level to high level. REF 、V CC , R1 and R2, so that the lower threshold voltage value U L If the actual voltage of the battery 200 is less than the first preset voltage value, the hysteresis voltage comparator 102 flips the level and outputs the flipped high level preset level to the controller 103.

[0079] The first preset voltage value is the maximum voltage value of the battery 200 required when the battery 200 cannot normally power the vehicle ECU. In one embodiment of the present application, the first preset voltage value may specifically be the voltage value of the battery 200 when it is low on power. For example, the first preset voltage value is 12V.

[0080] In addition, the resistance value of resistor R5 and the resistance value of resistor R4 can be determined according to the following formula 3:

[0081]

[0082] Among them, V BATT It is a standard voltage value when the battery 200 can normally supply power to the vehicle ECU, for example, it is a rated voltage value of the battery 200 .

[0083] In this embodiment, since the hysteresis comparator has a hysteresis, it can avoid the frequent triggering of the hysteresis comparator caused by the change of the actual voltage value of the battery 200.

[0084] The voltage converter 104 , typically a DC-DC converter, is used to convert the output voltage of the power battery 300 into a charging voltage for the storage battery 200 .

[0085] The controller 103 is specifically configured to execute the following steps S110 and S120 .

[0086] Step S110, obtaining the vehicle status of the vehicle.

[0087] In step S120 , when the vehicle is parked and powered off, and upon receiving a preset voltage level output by the hysteresis voltage comparator 102 in the charging circuit 100 , the voltage converter 104 in the charging circuit 100 is controlled to be in an operating state.

[0088] In this embodiment, when the vehicle is parked and powered off, and upon receiving the preset voltage level output by the hysteresis voltage comparator 102, the actual voltage value of the battery 200 is obtained from the voltage sensor 105 in the charging circuit 100. This allows the controller 103 to respond to the output level of the hysteresis voltage comparator 102 even when the vehicle is powered off. Conversely, if the vehicle is not parked and powered off, the controller 103 determines that the power battery 300 is powering the vehicle. In this case, the controller 103 does not respond to the output level of the hysteresis voltage comparator 102.

[0089] In one embodiment of the present application, the controller 103 is in a dormant state when the vehicle is powered off and does not receive the preset level output by the hysteresis voltage comparator 102. That is, when the vehicle is powered off and receives the preset level output by the hysteresis voltage comparator 102 in the charging circuit 100, the controller 103 is awakened by the hysteresis voltage comparator 102 and controls the voltage converter 104 in the charging circuit 100 to be in an active state.

[0090] In one embodiment of the present application, Figure 3 As shown, the controller 103 includes a vehicle controller unit (VCU) 1031 and a battery management system (BMS) 1032, wherein:

[0091] The input end of the vehicle controller 1031 is connected to the output end of the hysteresis voltage comparator 102 , and the output end of the vehicle controller 1031 is connected to the input end of the battery management system 1032 ;

[0092] The output terminal of the battery management system 1032 is connected to the control terminal of the voltage converter 104;

[0093] Among them, the hysteresis voltage comparator 102 outputs a preset level to the vehicle controller 1031. When the vehicle controller 1031 receives the preset level, it sends a charging instruction to the battery management system 1032. The battery management system 1032 controls the voltage converter 104 to be in an operating state according to the charging instruction.

[0094] In this embodiment, the controller 103 is composed of a vehicle controller 1031 and a BMS. Upon receiving the preset level output by the hysteresis voltage comparator 102, the vehicle controller 1031 sends a charging instruction to the battery management system 1032. Upon receiving the charging instruction sent by the vehicle controller 1031, the battery management system 1032 controls the voltage converter 104 to be in an operating state.

[0095] It is understood that if the battery management system 1032 does not receive a charging instruction from the vehicle controller 1031, it will not control the voltage converter 104 to be in an operating state. In this case, the voltage converter 104 is in a non-operating state, such as a dormant state. Furthermore, the voltage converter 104 can be awakened by the battery management system 1032 or the vehicle controller 1031, and then controlled by the battery management system 1032 to be in an operating state.

[0096] Based on the above, when the actual voltage of battery 200 is less than the first preset voltage value, hysteresis voltage comparator 102 outputs a preset voltage level to controller 103. Upon determining that the vehicle is powered off and receiving the preset voltage level output from hysteresis voltage comparator 102, controller 103 determines that the actual voltage of battery 200 is less than the first preset voltage value and cannot properly power the vehicle's ECU, and further determines that battery 200 needs to be charged. At this point, controller 103 controls voltage converter 104 to operate. Based on this, the voltage comparator connects the positive electrode of power battery 300 with the positive electrode of battery 200. The positive electrode of power battery 300, the voltage comparator, and the positive electrode of battery 200 form a charging path. Furthermore, the voltage comparator converts the output voltage of power battery 300 into the charging voltage of battery 200. At this point, battery 200 is being charged by power battery 300 and is in a charging state. That is to say, through the charging circuit 100 of the battery 200 provided in this application, when the entire vehicle is powered off and the actual voltage value of the battery 200 is less than the first preset voltage value, the power battery 300 can charge the battery 200, thereby ensuring that the battery 200 can normally supply power to the vehicle's ECU.

[0097] In addition, for the charging circuit 100 of the battery 200 provided in this application, the vehicle controller 1031 and the battery management system 1032 in the vehicle can be directly reused as the controller 103 in the charging circuit 100 of the battery 200 provided in this application, and the voltage converter 104 in the vehicle can be directly reused as the voltage converter 104 in the charging circuit 100 of the battery 200 provided in this application. In this way, only the hysteresis voltage comparator 102 and the reference voltage source 101 need to be added to the vehicle. This means that the hardware improvement of the charging circuit 100 of the battery 200 provided in this application is small and the cost is low.

[0098] The present application provides a battery charging circuit for use in a vehicle, comprising: a reference voltage source, a hysteresis voltage comparator, a controller, and a voltage converter, wherein: a first input terminal of the hysteresis voltage comparator is connected to an output terminal of the reference voltage source, a second input terminal of the hysteresis voltage comparator is connected to a positive electrode of a battery, and an output terminal of the hysteresis voltage comparator is connected to an input terminal of the controller; an output terminal of the controller is connected to a control terminal of the voltage converter; and the voltage converter is connected between a positive electrode of a power battery of the vehicle and a positive electrode of the battery; wherein the reference voltage source outputs a reference voltage of a reference voltage value to the hysteresis voltage comparator; when an actual voltage value of the battery is less than a first preset voltage value, the hysteresis voltage comparator outputs a preset voltage level to the controller; and when the controller receives the preset voltage level and determines that the vehicle is parked, the controller controls the voltage converter to be in an operating state, connects a charging path formed by the positive electrode of the power battery, the voltage converter, and the positive electrode of the battery, and converts the voltage value of the output voltage of the power battery into a charging voltage value of the battery. The battery is in a charging state, and the first preset voltage value is a lower threshold voltage value of the hysteresis voltage comparator. Through the battery charging circuit provided in this application, the power battery can charge the battery when the entire vehicle is powered off and the actual voltage value of the battery is less than the first preset voltage value, thereby ensuring that the battery can normally power the vehicle's ECU.

[0099] In one embodiment of the present application, Figure 4 As shown, the charging circuit 100 further includes a voltage sensor 105, wherein:

[0100] A first input terminal of the voltage sensor 105 is connected to the positive electrode of the battery 200 , a second input terminal of the voltage sensor 105 is connected to the negative electrode of the battery 200 , and an output terminal of the voltage sensor 105 is connected to the controller 103 ;

[0101] Among them, the voltage sensor 105 is used to collect the actual voltage value of the battery 200. When the battery 200 is in a charging state, the controller 103 obtains the actual voltage value of the battery 200 from the voltage sensor 105 at a set time interval. When the actual voltage value meets the preset voltage value corresponding to the current charging time, the voltage converter 104 is continuously controlled to be in a working state.

[0102] In one example, the set time interval may be 0.5 hours.

[0103] In this embodiment, the controller 103 is further configured to execute the following steps S130 and S140 after the above step S120 .

[0104] In step S130 , when the battery 200 is in a charging state, the actual voltage value of the battery 200 is obtained from the voltage sensor 105 in the charging circuit 100 at a set time interval.

[0105] Step S140 : When the actual voltage value matches the actual theoretical voltage value corresponding to the current charging duration, the voltage converter 104 is continuously controlled to be in the working state.

[0106] In this embodiment, a mapping relationship is pre-stored in the controller 103 , in which a corresponding relationship between a charging time and a corresponding actual theoretical voltage value is stored, which can be determined based on experience or experiments.

[0107] In an example, taking the first preset voltage value as 12V as an example, the mapping relationship is shown in Table 1 below.

[0108] Table 1

[0109] Charging time (hours) Actual theoretical voltage value (V) 0.5 12.2 1 12.4 1.5 12.6 2 12.8 2.5 13.0 3 13.2

[0110] In this embodiment, when the battery 200 is in a charging state, the actual voltage value of the battery 200 gradually increases. When the battery 200 is in a charging state, the controller 103 periodically obtains the actual voltage value of the battery 200 from the voltage sensor 105 at a set time interval. Furthermore, the controller 103 determines whether the currently obtained actual voltage value of the battery 200 is consistent with the theoretical actual voltage value corresponding to the current charging time based on the current charging time and a pre-stored mapping relationship.

[0111] Taking the current charging duration of 0.5 hours as an example, based on Table 1 above, the actual theoretical voltage value is determined to be 12.2V. At this time, if the deviation between the actual voltage value obtained by the controller 103 from the voltage sensor 105 and 12.2V is within the preset deviation when the battery 200 is in the charging state, it means that the actual voltage value meets the actual theoretical voltage value corresponding to the current charging duration, and the battery 200 is charging normally. If the battery 200 is charging normally, the voltage converter 104 is continuously controlled to remain in the operating state.

[0112] In one example, the preset deviation is 0.2V.

[0113] Corresponding to the previous embodiment, in one embodiment of the present application, as Figure 4 As shown, the charging circuit 100 provided in this application further includes: a prompting device 106, wherein:

[0114] The input end of the prompt device 106 is connected to the controller 103. When the actual voltage value does not meet the preset voltage value corresponding to the current charging time, the controller 103 controls the prompt device 106 to output a prompt message and controls the voltage converter 104 to be in a non-working state.

[0115] In this embodiment, corresponding to the above step S140 , the controller 103 is further configured to execute the following step S150 .

[0116] In step S150 , when the actual voltage value does not meet the preset voltage value corresponding to the current charging duration, the prompt device 106 in the charging circuit 100 is controlled to output a prompt message, and the voltage converter 104 is controlled to be in a non-operating state.

[0117] If the actual voltage value does not match the actual theoretical voltage value corresponding to the current charging time, it indicates that the battery 200 is not charging properly and is faulty. If the battery 200 is not charging properly, the voltage converter 104 is controlled to be in a non-operating state, and the prompt device 106 is controlled to output a prompt message to remind the user of the battery 200 fault.

[0118] In one embodiment of the present application, the prompting device 106 may be a display device, or a communication module that establishes a communication connection with a remote information processing controller 103 (Telematics BOX, TBOX).

[0119] In one embodiment of the present application, Figure 4 As shown, the charging circuit 100 further includes a voltage sensor 105, wherein:

[0120] A first input terminal of the voltage sensor 105 is connected to the positive electrode of the battery 200 , a second input terminal of the voltage sensor 105 is connected to the negative electrode of the battery 200 , and an output terminal of the voltage sensor 105 is connected to the controller 103 ;

[0121] Among them, the voltage sensor 105 is used to collect the actual voltage value of the battery 200. When the vehicle is in a parked and powered-off state and when the controller 103 receives the preset level output by the hysteresis voltage comparator 102, it obtains the actual voltage value of the battery 200 from the voltage sensor 105. When the actual voltage value is less than or equal to the first preset voltage value, the voltage converter 104 is controlled to be in an operating state.

[0122] In this embodiment, the controller 103 implements the above step S120 specifically through the following steps S1201 and S1202.

[0123] Step S1201 : when the vehicle is parked and powered off and a preset voltage level is output by the hysteresis voltage comparator 102 , the actual voltage value of the battery 200 is obtained from the voltage sensor 105 in the charging circuit 100 .

[0124] Step S1202 : When the actual voltage value is less than the first preset voltage value, control the voltage converter 104 to be in an operating state.

[0125] When the vehicle is in a parked and powered-off state and the controller 103 receives the preset level output by the hysteresis voltage comparator 102, the controller 103 obtains the actual voltage value of the battery 200 from the voltage sensor 105. When the actual voltage value is less than the first preset voltage value, it is determined that the hysteresis voltage comparator 102 is not malfunctioning. At this time, the voltage converter 104 is controlled to be in an operating state.

[0126] In this embodiment, when the vehicle is parked and powered off and the controller 103 receives the preset voltage level output by the hysteresis voltage comparator 102, it controls the voltage converter 104 to operate only after confirming again through the voltage sensor 105 that the actual voltage value is less than the first preset voltage value. This prevents the hysteresis comparator from erroneously triggering, causing the preset voltage level to be erroneously output to the controller 103, and thus causing the controller 103 to erroneously control the voltage converter 104 to operate.

[0127] In one embodiment of the present application, the controller 103 is further configured to execute the following step S160 .

[0128] Step S160 : When the actual voltage value obtained from the voltage sensor 105 in the charging circuit 100 is greater than or equal to the second preset voltage value, the voltage converter 104 is controlled to be in a non-operating state.

[0129] In this embodiment, the second preset voltage value is the standard voltage of the battery 200 when the battery 200 can normally supply power to the ECU of the vehicle.

[0130] When the battery 200 is in a charging state, the actual voltage value of the battery 200 gradually increases. When the actual voltage value is greater than or equal to the second preset voltage value, it indicates that the battery 200 is fully charged. At this time, the voltage converter 104 is controlled to be in an inactive state, and the battery 200 stops charging. Furthermore, to reduce power consumption, the voltage converter 104 can be further controlled to be in a dormant state.

[0131] In one embodiment of the present application, the above steps S130 and S1201 of obtaining the actual voltage value of the battery 200 from the voltage sensor 105 in the charging circuit 100 are specifically implemented through the following steps S170 to S190.

[0132] In step S170 , the voltage converter 104 is controlled to be in a non-operating state.

[0133] In step S180 , when the voltage converter 104 is in a non-operating state, the actual voltage value of the battery 200 is obtained from the voltage sensor 105 in the charging circuit 100 .

[0134] In step S190 , when the actual voltage value of the battery 200 is obtained from the voltage sensor 105 in the charging circuit 100 , the control voltage converter 104 is restored to the operating state.

[0135] In this embodiment, when obtaining the actual voltage value of the battery 200 from the voltage sensor 105 in the charging circuit 100, the voltage converter 104 is first controlled to be in a non-operating state. While the voltage converter 104 is in the non-operating state, the actual voltage value of the battery 200 is obtained from the voltage sensor 105 in the charging circuit 100. In this way, an accurate actual voltage value of the battery 200 can be obtained. After obtaining the accurate actual voltage value of the battery 200, the voltage converter 104 is controlled to resume operation, thereby restoring the battery 200 to a charged state.

[0136] The present application also provides a battery charging method, which is applied to any of the charging circuits provided in the above charging circuit embodiments, such as Figure 5 As shown, the process includes the following steps S510 and S520.

[0137] Step S510, obtaining the vehicle status of the vehicle;

[0138] Step S520, when the vehicle is parked and powered off, and a preset level is output by a hysteresis voltage comparator in the charging circuit, controlling the voltage converter in the charging circuit to be in an operating state;

[0139] Among them, when the actual voltage value of the battery is less than the first preset voltage value, the hysteresis voltage comparator outputs a preset level, and when the voltage converter is in an operating state, the charging path between the positive electrode of the vehicle's power battery, the voltage converter and the positive electrode of the battery is connected, and the voltage converter converts the voltage value of the output voltage of the power battery into the charging voltage value of the battery. The battery is in a charging state, and the first preset voltage value is the lower threshold voltage value of the hysteresis voltage comparator.

[0140] In one embodiment of the present application, the battery charging method provided in the present application further includes the following steps S530 to S550.

[0141] Step 530: When the battery is in a charging state, obtain the actual voltage value of the battery from the voltage sensor in the charging circuit at a set time interval;

[0142] Step 540 , when the actual voltage value meets the actual theoretical voltage value corresponding to the current charging duration, continuously controlling the voltage converter to be in an operating state;

[0143] And / or, step 550, when the actual voltage value does not meet the preset voltage value corresponding to the current charging duration, controlling the prompt device in the charging circuit to output prompt information, and controlling the voltage converter to be in a non-working state.

[0144] In one embodiment of the present application, in the above-mentioned step S520, upon receiving the preset level output by the hysteresis voltage comparator in the charging circuit, controlling the voltage converter in the charging circuit to be in an operating state is specifically implemented through the following steps S5201 and S5202.

[0145] Step S5201, when the vehicle is in a parked and powered-off state and a preset voltage level is output by a hysteresis voltage comparator in the charging circuit, obtaining an actual voltage value of the battery from a voltage sensor in the charging circuit;

[0146] Step S5202: When the actual voltage value is less than the first preset voltage value, control the voltage converter to be in an operating state.

[0147] In one embodiment of the present application, the battery charging method provided in the present application further includes the following step S560.

[0148] Step S560: When the actual voltage value obtained from the voltage sensor in the charging circuit is greater than or equal to a second preset voltage value, control the voltage converter to be in a non-operating state.

[0149] In one embodiment of the present application, the steps S520 and S5101 of obtaining the actual voltage value of the battery from the voltage sensor in the charging circuit are implemented through the following steps S570 to S590.

[0150] Step S570, controlling the voltage converter to be in a non-operating state;

[0151] Step S580, when the voltage converter is in a non-operating state, obtaining an actual voltage value of the battery from a voltage sensor in the charging circuit;

[0152] Step S590: When the voltage sensor obtains the actual voltage value of the battery, control the voltage converter to resume the working state.

[0153] In combination with the above embodiments, in one embodiment of the present application, the battery charging method adopted in the present application includes the following steps S601 to S607.

[0154] Step S601, obtaining the vehicle status of the vehicle;

[0155] Step S602: When the vehicle is parked and powered off, and a preset voltage level is output by a hysteresis voltage comparator in the charging circuit, an actual voltage value of the battery is obtained from a voltage sensor in the charging circuit.

[0156] Step S603: When the actual voltage value is less than the first preset voltage value, controlling the voltage converter to be in an operating state and the battery to be in a charging state;

[0157] Step S604, when the battery is in a charging state, obtaining the actual voltage value of the battery from the voltage sensor in the charging circuit at a set time interval;

[0158] Step S605 , when the actual voltage value is consistent with the actual theoretical voltage value corresponding to the current charging duration, continuously controlling the voltage converter to be in an operating state;

[0159] Step S606, when the actual voltage value does not meet the preset voltage value corresponding to the current charging duration, controlling the prompt device in the charging circuit to output a prompt message, and controlling the voltage converter to be in a non-operating state;

[0160] Step S607 : When the actual voltage value obtained from the voltage sensor in the charging circuit is greater than or equal to a second preset voltage value, control the voltage converter to be in a non-operating state.

[0161] It should be noted that the specific implementation of each step in the above-mentioned battery charging method embodiment can refer to the specific implementation of the controller in the above-mentioned charging circuit embodiment, and will not be repeated here.

[0162] The present application also provides a battery charging device 600, which is applied to the charging circuit according to any one of claims 1 to 5. Figure 6 Shown, including:

[0163] An acquisition module 610 is used to acquire the vehicle status of the vehicle;

[0164] a control module 620 configured to control a voltage converter in the charging circuit to be in an operating state when the vehicle is in a parked state and the vehicle is powered off and a preset level is output by a hysteresis voltage comparator in the charging circuit;

[0165] Among them, when the actual voltage value of the battery is less than the first preset voltage value, the hysteresis voltage comparator outputs a preset level, and when the voltage converter is in an operating state, the charging path between the positive electrode of the vehicle's power battery, the voltage converter and the positive electrode of the battery is connected, and the voltage converter converts the voltage value of the output voltage of the power battery into the charging voltage value of the battery. The battery is in a charging state, and the first preset voltage value is the lower threshold voltage value of the hysteresis voltage comparator.

[0166] In one embodiment of the present application, the acquisition module 610 is further configured to acquire, when the battery is in a charging state, an actual voltage value of the battery from a voltage sensor in the charging circuit at a set time interval;

[0167] Furthermore, the control module 620 is further configured to continuously control the voltage converter to be in an operating state when the actual voltage value meets the actual theoretical voltage value corresponding to the current charging duration;

[0168] And / or, when the actual voltage value does not meet the preset voltage value corresponding to the current charging duration, controlling the prompt device in the charging circuit to output prompt information, and controlling the voltage converter to be in a non-working state.

[0169] In one embodiment of the present application, the control module 620 is specifically configured to obtain an actual voltage value of the battery from a voltage sensor in the charging circuit when the vehicle is in a parked state and the vehicle is powered off and a preset level is output by a hysteresis voltage comparator in the charging circuit;

[0170] When the actual voltage value is less than the first preset voltage value, the voltage converter is controlled to be in an operating state.

[0171] In one embodiment of the present application, the acquisition module 610 is specifically configured to control the voltage converter to be in a non-operating state;

[0172] When the voltage converter is in a non-operating state, obtaining an actual voltage value of the battery from a voltage sensor in the charging circuit;

[0173] When the voltage sensor obtains the actual voltage value of the battery, the voltage converter is controlled to resume the working state.

[0174] In one embodiment of the present application, the control module 620 is further configured to control the voltage converter to be in a non-working state when the actual voltage value obtained from the voltage sensor in the charging circuit is greater than or equal to a second preset voltage value.

[0175] The present application also provides a vehicle, the vehicle comprising any one of the battery charging devices 600 provided in the above device embodiments;

[0176] Or, comprising the charging circuit 100 as provided in any one of the above charging circuit embodiments;

[0177] Or, as Figure 7 As shown, the vehicle 700 includes a memory 710 and a processor 720, wherein the memory 710 is used to store computer instructions, and the processor 720 is used to call the computer instructions from the memory 710 to execute any one of the methods provided in the above method embodiments.

[0178] In this embodiment, the vehicle is specifically an electric vehicle, such as a pure electric vehicle or a hybrid vehicle including an electric power source.

[0179] The present application also provides a computer-readable storage medium having a computer program stored thereon, and when the computer program is executed by a processor, the method according to any one of the above method embodiments is implemented.

[0180] The present application may be a system, method and / or computer program product. The computer program product may include a computer-readable storage medium carrying computer-readable program instructions for causing a processor to implement various aspects of the present application.

[0181] A computer-readable storage medium can be a tangible device that can hold and store instructions for use by an instruction execution device. A computer-readable storage medium can be, for example, but not limited to, an electrical storage device, a magnetic storage device, an optical storage device, an electromagnetic storage device, a semiconductor storage device, or any suitable combination thereof. More specific examples (a non-exhaustive list) of computer-readable storage media include: a portable computer disk, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), a static random access memory (SRAM), a portable compact disc read-only memory (CD-ROM), a digital versatile disk (DVD), a memory stick, a floppy disk, a mechanical encoding device, such as a punch card or a raised structure in a groove on which instructions are stored, and any suitable combination thereof. As used herein, a computer-readable storage medium is not to be construed as a transient signal per se, such as a radio wave or other freely propagating electromagnetic wave, an electromagnetic wave propagating through a waveguide or other transmission medium (e.g., a light pulse through a fiber optic cable), or an electrical signal transmitted through an electrical wire.

[0182] The computer-readable program instructions described herein can be downloaded from a computer-readable storage medium to each computing / processing device, or downloaded to an external computer or external storage device via a network, such as the Internet, a local area network, a wide area network, and / or a wireless network. The network can include copper transmission cables, fiber optic transmission, wireless transmission, routers, firewalls, switches, gateway computers, and / or edge servers. The network adapter card or network interface in each computing / processing device receives the computer-readable program instructions from the network and forwards the computer-readable program instructions to be stored in the computer-readable storage medium in each computing / processing device.

[0183] The computer program instructions for performing the operation of the present application can be assembly instructions, instruction set architecture (ISA) instructions, machine instructions, machine-related instructions, microcode, firmware instructions, state setting data or source code or object code written in any combination of one or more programming languages, wherein the programming language comprises object-oriented programming languages-such as Smalltalk, C++ etc., and conventional procedural programming languages-such as " C " language or similar programming languages. Computer-readable program instructions can be executed completely on the user's computer, partially on the user's computer, executed as an independent software package, partly on the user's computer and partly on a remote computer, or executed completely on a remote computer or server. In the case of a remote computer, the remote computer can be connected to the user's computer by any type of network-comprising a local area network (LAN) or a wide area network (WAN), or can be connected to an external computer (such as utilizing an Internet service provider to connect by the Internet). In certain embodiments, by utilizing the state information of computer-readable program instructions to carry out personalized customization electronic circuits, such as programmable logic circuits, field programmable gate arrays (FPGAs) or programmable logic arrays (PLAs), this electronic circuit can execute computer-readable program instructions, thereby realizing various aspects of the present application.

[0184] Various aspects of the present application are described herein with reference to flowcharts and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the present application. It should be understood that each block of the flowcharts and / or block diagrams, and combinations of blocks in the flowcharts and / or block diagrams, can be implemented by computer-readable program instructions.

[0185] These computer-readable program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device, thereby producing a machine, so that when these instructions are executed by the processor of the computer or other programmable data processing device, a device is generated that implements the functions / actions specified in one or more blocks in the flowchart and / or block diagram. These computer-readable program instructions can also be stored in a computer-readable storage medium, where these instructions cause the computer, programmable data processing device, and / or other device to operate in a specific manner. Thus, the computer-readable medium storing the instructions comprises an article of manufacture that includes instructions for implementing various aspects of the functions / actions specified in one or more blocks in the flowchart and / or block diagram.

[0186] Computer-readable program instructions may also be loaded onto a computer, other programmable data processing apparatus, or other device so that a series of operational steps are performed on the computer, other programmable data processing apparatus, or other device to produce a computer-implemented process, thereby causing the instructions executed on the computer, other programmable data processing apparatus, or other device to implement the functions / actions specified in one or more blocks in the flowchart and / or block diagram.

[0187] The flowcharts and block diagrams in the accompanying drawings show the possible architecture, functions and operations of the systems, methods and computer program products according to multiple embodiments of the present application. In this regard, each box in the flowchart or block diagram can represent a part of a module, program segment or instruction, and the part of the module, program segment or instruction contains one or more executable instructions for realizing the specified logical function. In some alternative implementations, the functions marked in the box can also occur in an order different from that marked in the accompanying drawings. For example, two consecutive boxes can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram and / or flowchart, and the combination of the boxes in the block diagram and / or flowchart, can be implemented by a dedicated hardware-based system that performs the specified function or action, or can be implemented by a combination of dedicated hardware and computer instructions. It is well known to those skilled in the art that implementation by hardware, implementation by software, and implementation by a combination of software and hardware are all equivalent.

[0188] The embodiments of the present application have been described above. The above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and variations will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments. The terms used herein are selected to best explain the principles of the embodiments, practical applications, or technical improvements to technologies in the market, or to enable other persons skilled in the art to understand the embodiments disclosed herein. The scope of this application is defined by the appended claims.

Claims

1. A battery charging circuit, characterized in that: Applied to vehicles, including: a reference voltage source, a hysteresis voltage comparator, a controller and a voltage converter, wherein: The first input terminal of the hysteresis voltage comparator is connected to the output terminal of the reference voltage source, the second input terminal of the hysteresis voltage comparator is connected to the positive electrode of the battery, and the output terminal of the hysteresis voltage comparator is connected to the input terminal of the controller; The output terminal of the controller is connected to the control terminal of the voltage converter; The voltage converter is connected between the positive electrode of the power battery of the vehicle and the positive electrode of the storage battery; In which, the reference voltage source outputs a reference voltage of a reference voltage value to the hysteresis voltage comparator. When the actual voltage value of the battery is less than a first preset voltage value, the hysteresis voltage comparator outputs a preset level to the controller. When the controller receives the preset level and determines that the vehicle state is parked, the controller controls the voltage converter to be in an operating state, and the charging path formed by the positive electrode of the power battery, the voltage converter and the positive electrode of the battery is connected. The voltage converter converts the voltage value of the output voltage of the power battery into a charging voltage value of the battery. The battery is in a charging state, and the first preset voltage value is the lower threshold voltage value of the hysteresis voltage comparator.

2. The charging circuit according to claim 1, wherein: The controller includes a vehicle controller and a battery management system, wherein: The input end of the vehicle controller is connected to the output end of the hysteresis voltage comparator, and the output end of the vehicle controller is connected to the input end of the battery management system; The output terminal of the battery management system is connected to the control terminal of the voltage converter; The hysteresis voltage comparator outputs a preset level to the vehicle controller. Upon receiving the preset level, the vehicle controller sends a charging instruction to the battery management system. The battery management system controls the voltage converter to be in an operating state according to the charging instruction.

3. The charging circuit according to claim 1, wherein: The charging circuit further includes a voltage sensor, wherein: The first input end of the voltage sensor is connected to the positive electrode of the battery, the second input end of the voltage sensor is connected to the negative electrode of the battery, and the output end of the voltage sensor is connected to the controller; In which, the voltage sensor is used to collect the actual voltage value of the battery. When the battery is in a charging state, the controller obtains the actual voltage value of the battery from the voltage sensor at a set time interval. When the actual voltage value is consistent with the actual theoretical voltage value corresponding to the current charging time, the controller continuously controls the voltage converter to be in a working state.

4. The charging circuit according to claim 3, wherein: The charging circuit further includes a prompting device, wherein: The input end of the prompt device is connected to the controller. When the actual voltage value does not meet the preset voltage value corresponding to the current charging time, the controller controls the prompt device to output prompt information and controls the voltage converter to be in a non-working state.

5. The charging circuit according to claim 1, wherein: The battery charging circuit further includes a voltage sensor, wherein: The first input end of the voltage sensor is connected to the positive electrode of the battery, the second input end of the voltage sensor is connected to the negative electrode of the battery, and the output end of the voltage sensor is connected to the controller; In which, the voltage sensor is used to collect the actual voltage value of the battery. When the vehicle is in a parked and powered-off state and when the controller receives the preset level output by the hysteresis voltage comparator, the controller obtains the actual voltage value of the battery from the voltage sensor. When the actual voltage value is less than the first preset voltage value, the controller controls the voltage converter to be in an operating state.

6. A method for charging a battery, characterized in that: The method is applied to the charging circuit according to any one of claims 1 to 5, comprising: Get the vehicle status of the vehicle; When the vehicle is parked and powered off, and a preset level is output by a hysteresis voltage comparator in the charging circuit, controlling the voltage converter in the charging circuit to be in an operating state; Among them, when the actual voltage value of the battery is less than the first preset voltage value, the hysteresis voltage comparator outputs a preset level, and when the voltage converter is in an operating state, the charging path between the positive electrode of the vehicle's power battery, the voltage converter and the positive electrode of the battery is connected, and the voltage converter converts the voltage value of the output voltage of the power battery into the charging voltage value of the battery. The battery is in a charging state, and the first preset voltage value is the lower threshold voltage value of the hysteresis voltage comparator.

7. The charging method according to claim 6, characterized in that: The method further comprises: When the battery is in a charging state, obtaining an actual voltage value of the battery from a voltage sensor in the charging circuit at set time intervals; When the actual voltage value is consistent with the actual theoretical voltage value corresponding to the current charging duration, continuously controlling the voltage converter to be in an operating state; And / or, when the actual voltage value does not meet the preset voltage value corresponding to the current charging duration, controlling the prompt device in the charging circuit to output prompt information, and controlling the voltage converter to be in a non-working state.

8. The charging method according to claim 6, wherein: The method of controlling the voltage converter in the charging circuit to be in an operating state when the vehicle is parked and powered off and a preset level output by a hysteresis voltage comparator in the charging circuit is received includes: When the vehicle is parked and powered off, and a preset voltage level is output by a hysteresis voltage comparator in the charging circuit, an actual voltage value of the battery is obtained from a voltage sensor in the charging circuit; When the actual voltage value is less than the first preset voltage value, the voltage converter is controlled to be in an operating state.

9. The charging method according to claim 7 or 8, characterized in that: The step of obtaining the actual voltage value of the battery from a voltage sensor in the charging circuit includes: controlling the voltage converter to be in a non-operating state; When the voltage converter is in a non-operating state, obtaining an actual voltage value of the battery from a voltage sensor in the charging circuit; When the voltage sensor obtains the actual voltage value of the battery, the voltage converter is controlled to resume the working state.

10. The charging method according to any one of claims 6 to 8, characterized in that: The method further comprises: When the actual voltage value acquired from the voltage sensor in the charging circuit is greater than or equal to a second preset voltage value, the voltage converter is controlled to be in a non-operating state.

11. A battery charging device, characterized in that: The device is applied to the charging circuit according to any one of claims 1 to 5, comprising: An acquisition module, used to obtain the vehicle status of the vehicle; a control module, configured to control a voltage converter in the charging circuit to be in an operating state when the vehicle is in a parked state and the vehicle is powered off and a preset level is output by a hysteresis voltage comparator in the charging circuit; Among them, when the actual voltage value of the battery is less than the first preset voltage value, the hysteresis voltage comparator outputs a preset level, and when the voltage converter is in an operating state, the charging path between the positive electrode of the vehicle's power battery, the voltage converter and the positive electrode of the battery is connected, and the voltage converter converts the voltage value of the output voltage of the power battery into the charging voltage value of the battery. The battery is in a charging state, and the first preset voltage value is the lower threshold voltage value of the hysteresis voltage comparator.

12. A vehicle, characterized in that: The vehicle includes the apparatus of claim 11; Or, comprising a charging circuit as claimed in any one of claims 1 to 5; Alternatively, the vehicle includes a memory and a processor, the memory is used to store computer instructions, and the processor is used to call the computer instructions from the memory to execute the method according to any one of claims 6 to 10.

13. A computer-readable storage medium, characterized in that A computer program is stored thereon, which implements the method according to any one of claims 6 to 10 when executed by a processor.

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