Vehicle battery charging method, system and vehicle

Abstract

The present invention discloses a vehicle battery charging method, system and vehicle, the method comprising: determining whether the vehicle is in an ignition-off state; if so, detecting whether the battery voltage is lower than a first threshold; when the battery voltage is lower than the first threshold and the charging gun is connected to a power battery pack, determining whether the remaining power of the power battery pack is higher than a second threshold; when the remaining power of the power battery pack is higher than the second threshold, or when the charging gun is not connected to the power battery pack, starting the pre-charging working mode of the battery to charge the battery. The present invention can ensure that the vehicle can start normally after being stored for one month even if a battery with a small capacity is selected, effectively reducing the cost and weight of the vehicle; it can also solve the problem of starting the battery charging function when the vehicle power battery pack is connected to a charging gun, or when the vehicle is in a non-ignition-off state, to ensure the power of the vehicle battery.

Description

Technical Field

[0001] The present invention belongs to the technical field of vehicles, and in particular relates to a vehicle battery charging method, system and vehicle. Background Art

[0002] With the popularity of new energy electric vehicles, there are more and more usage scenarios. Since the number of controller units in new energy electric vehicles is more than twice that of fuel vehicles, the static power consumption of new energy electric vehicles is higher than that of fuel vehicles. In order to ensure that the vehicle can start normally after being stored for one month, if a larger capacity on-board battery is selected, the cost and weight of the vehicle will increase. At present, the intelligent charging function of new energy electric vehicles on the market is realized when the vehicle is in a static and turned off state, and the power battery pack is not connected to the charging gun. When the vehicle is connected to the charging gun or is not turned off, the vehicle battery will have a low power problem. Summary of the invention

[0003] In order to solve the problems of the prior art, the present invention provides a vehicle battery charging method, system and vehicle.

[0004] The vehicle battery charging method and system of the present invention can charge the vehicle battery by outputting a voltage through a voltage converter when the vehicle is in an ignition-off state. Even if a battery with a small capacity is selected, it can ensure that the vehicle can be started normally after being stored for one month, thereby effectively reducing the cost and weight of the vehicle. In addition, it can also solve the problem of starting the battery replenishment function when the vehicle power battery pack is connected to a charging gun or the vehicle is in a non-ignition-off state, thereby ensuring the power of the vehicle battery.

[0005] The technical solution is as follows:

[0006] In a first aspect, the present invention provides a vehicle battery charging method, the method comprising:

[0007] Determining whether the vehicle is in an ignition-off state;

[0008] If so, detecting whether the battery voltage is lower than a first threshold;

[0009] When the battery voltage is lower than a first threshold and the charging gun is connected to the power battery pack, determining whether the remaining power of the power battery pack is higher than a second threshold;

[0010] When the remaining power of the power battery pack is higher than a second threshold, or when the charging gun is not connected to the power battery pack, starting a pre-charging working mode for the battery;

[0011] The pre-charging working mode for the storage battery includes: sending a high-voltage power-on instruction to the battery management controller and sending a start instruction to the voltage converter to output a third threshold voltage to charge the storage battery.

[0012] In some embodiments, after charging the battery, the method further comprises:

[0013] Determining whether the charging time exceeds a fourth threshold;

[0014] If so, exit the pre-charging working mode of the battery, send a high voltage power-off instruction to the battery management controller, and the vehicle enters the sleep mode.

[0015] In some embodiments, the method comprises:

[0016] When the remaining power of the power battery pack is not higher than a second threshold, starting the external AC charging working mode to charge the power battery pack;

[0017] After the external AC power source charges the power battery pack, a high-voltage power-on instruction is sent to the battery management controller and a start instruction is sent to the voltage converter to output a third threshold voltage to charge the storage battery;

[0018] Determine whether the power battery pack is fully charged; if so, exit the external AC charging working mode, send a high-voltage power-off command to the battery management controller, and the vehicle enters the sleep mode.

[0019] In some embodiments, the method comprises:

[0020] When the vehicle is in a non-ignition-off state, detecting whether the battery voltage is lower than a first threshold value; if so, starting a pre-charging working mode for the battery, sending a high-voltage power-on instruction to the battery management controller and a start instruction to the voltage converter, outputting a third threshold voltage, and charging the battery;

[0021] Determine whether the charging time exceeds a fourth threshold; if so, exit the pre-charging working mode of the battery, send a high-voltage power-off command to the battery management controller, and the vehicle enters a sleep mode.

[0022] In some embodiments, before starting the pre-charging working mode of the battery, the method includes:

[0023] Determine whether the remaining power of the power battery pack is greater than a fifth threshold, and whether the minimum voltage of the power battery pack is greater than a sixth threshold; if so, start the pre-charging working mode for the battery; if not, do not start the pre-charging working mode for the battery.

[0024] In a second aspect, the present invention further provides a vehicle battery charging system, the system comprising a power battery pack, a voltage converter, and a battery.

[0025] The positive electrode of the power battery pack is connected to the positive electrode of the voltage converter input terminal, and the positive electrode of the voltage converter output terminal is connected to the positive electrode of the battery input terminal;

[0026] The negative electrode of the power battery pack is connected to the negative electrode of the voltage converter input terminal, and the negative electrode of the voltage converter output terminal is connected to the negative electrode of the battery input terminal;

[0027] The voltage converter is used to output a third threshold voltage to charge the battery.

[0028] In some embodiments, the system includes a positive contactor, a pre-charge contactor, a pre-charge resistor, a negative contactor, and a battery management controller.

[0029] The first static contact of the positive contactor is connected to the positive electrode of the power battery pack, the second static contact of the positive contactor is connected to the positive electrode of the voltage converter input terminal, the first control terminal of the coil of the positive contactor is grounded, and the second control terminal of the coil of the positive contactor is connected to the battery management controller;

[0030] The first static contact of the pre-charging contactor is connected to the positive electrode of the power battery pack, the second static contact of the pre-charging contactor is connected to the first end of the pre-charging resistor, the second end of the pre-charging resistor is connected to the positive electrode of the voltage converter input end, the first control end of the coil of the pre-charging contactor is grounded, and the second control end of the coil of the pre-charging contactor is connected to the battery management controller;

[0031] The first static contact of the negative contactor is connected to the negative electrode of the power battery pack, the second static contact of the negative contactor is connected to the negative electrode of the voltage converter input terminal, the first control terminal of the coil of the negative contactor is grounded, and the second control terminal of the coil of the negative contactor is connected to the battery management controller;

[0032] The battery management controller is used to detect whether the battery voltage is lower than a first threshold value, to start or exit a pre-charging working mode for the battery; and to start or exit an external AC charging working mode.

[0033] In some embodiments, the system further includes a vehicle controller and a vehicle networking controller.

[0034] The vehicle controller is connected to the battery management controller for communication via a cable, and is connected to the voltage converter and the vehicle networking controller for communication via a cable;

[0035] The vehicle controller is used to send a high voltage power-on or power-off instruction to the battery management controller;

[0036] The Internet of Vehicles controller is used to send text messages to users through a background server.

[0037] In some embodiments, the system includes a power battery pack, a charger, and a charging gun.

[0038] The power battery pack includes the power battery group, the positive contactor, the pre-charge contactor, the pre-charge resistor, the negative contactor, and the battery management controller, and constitutes the power battery pack;

[0039] The charging gun is connected to the power battery pack via the charger.

[0040] In a third aspect, the present invention further provides a vehicle, comprising a vehicle battery charging system as described in any one of the second aspects.

[0041] The beneficial effects brought by the technical solution disclosed in the embodiment of the present invention are:

[0042] The vehicle battery charging method and system of the present invention can charge the vehicle battery by outputting a voltage through a voltage converter when the vehicle is in an ignition-off state. Even if a battery with a small capacity is selected, it can ensure that the vehicle can be started normally after being stored for one month, thereby effectively reducing the cost and weight of the vehicle. In addition, it can also solve the problem of starting the battery replenishment function when the vehicle power battery pack is connected to a charging gun or the vehicle is in a non-ignition-off state, thereby ensuring the power of the vehicle battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] After reading the detailed description of the embodiments of the present disclosure in conjunction with the following drawings, the above-mentioned features and advantages of the present invention can be better understood. Obviously, the drawings in the following description are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can also be obtained based on these drawings without creative work.

[0044] Figure 1 A flow chart showing a vehicle battery charging method according to the present invention is shown;

[0045] Figure 2 The structure diagram of the vehicle battery charging system of the present invention is shown;

[0046] Figure annotation:

[0047] 1. Power battery pack; 2. Positive contactor; 3. Pre-charge contactor; 4. Pre-charge resistor; 5. Battery management controller; 6. Negative contactor; 7. Power battery pack; 8. Voltage converter; 9. Whole machine controller; 10. Battery; 11. Internet of Vehicles controller; A. First static contact of positive contactor; B. Second static contact of positive contactor; C. First control end of coil of positive contactor; D. Second control end of coil of positive contactor; E. First static contact of pre-charge contactor; F. Second static contact of pre-charge contactor; G. First control end of coil of pre-charge contactor; H. Second control end of coil of pre-charge contactor; I. ​​First static contact of negative contactor; J. Second static contact of negative contactor; K. First control end of coil of negative contactor; L. Second control end of coil of negative contactor. DETAILED DESCRIPTION

[0048] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution in the embodiment of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiment of the present invention. Obviously, the described embodiment is only a part of the embodiment of the present invention, not all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0049] It should be noted that the descriptions of the present invention regarding directions such as "left", "right", and "below" are all defined based on the relationship between the orientations or positions shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device must be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. The terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. In the description of the present invention, "multiple" or "several" means more than two, unless otherwise clearly and specifically defined.

[0050] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, mechanical terms such as "installation" and "setting" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication connection; it can be a direct connection, an indirect connection through an intermediate medium, or the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0051] Embodiment 1

[0052] The embodiment of the present invention provides a vehicle battery charging method, such as Figure 1 As shown, the method includes:

[0053] Step S1, determine whether the remaining power SOC of the power battery pack 7 is greater than the fifth threshold, and whether the minimum voltage of the power battery pack 7 is greater than the sixth threshold; if so, start the pre-charging working mode of the battery 10, if not, do not start the pre-charging working mode of the battery 10.

[0054] Specifically, before the battery management controller (BMS) 5 starts the pre-charging working mode for the storage battery 10, it is determined whether the remaining power SOC of the power battery pack 7 is greater than 10%, and whether the minimum voltage of the power battery pack 7 is greater than 3.45V; if so, the battery management controller (BMS) 5 starts the pre-charging working mode for the storage battery 10, if not, the battery management controller (BMS) 5 does not start the pre-charging working mode for the storage battery 10; to avoid the pre-charging working mode of the storage battery 10 being frequently turned on, causing the power battery pack 7 to be in an over-discharged state and resulting in power loss.

[0055] Here, the fifth threshold is 10% and the sixth threshold is 3.45V.

[0056] Step S2, determining whether the vehicle is in an ignition-off state;

[0057] If so, detecting whether the voltage of the battery 10 is lower than a first threshold;

[0058] When the voltage of the storage battery 10 is lower than the first threshold and the charging gun is connected to the power battery pack 7, it is determined whether the remaining power SOC of the power battery pack 7 is higher than the second threshold;

[0059] When the remaining power SOC of the power battery pack 7 is higher than a second threshold, or when the charging gun is not connected to the power battery pack 7, the pre-charging working mode of the storage battery 10 is turned on;

[0060] The pre-charging operation mode for the storage battery 10 includes: sending a high-voltage power-on instruction to a battery management controller (BMS) 5 and sending a start instruction to a voltage converter (DCDC) 8 to output a third threshold voltage to charge the storage battery 10 .

[0061] Specifically, determining whether the vehicle is in an ignition-off state;

[0062] If so, the battery management controller (BMS) 5 wakes up at a fixed time and detects whether the voltage of the battery 10 is lower than 12V;

[0063] If yes, when the voltage of the battery 10 is lower than 12V and the charging gun is connected to the power battery pack 7, it is determined whether the remaining power SOC of the power battery pack 7 is higher than 95%;

[0064] When the remaining power SOC of the power battery pack 7 is higher than 95%, the battery management controller (BMS) 5 starts the pre-charging working mode for the storage battery 10;

[0065] The pre-charging working mode for the battery 10 includes: the vehicle control unit (VCU) sends a high-voltage power-on instruction to the battery management controller (BMS) 5 and sends a start instruction to the voltage converter (DCDC) 8, and the voltage converter (DCDC) 8 outputs a voltage of 13.8V to charge the battery 10.

[0066] It can be understood that when the voltage of the battery 10 is not less than 12V, the process returns to determining whether the vehicle is in an ignition-off state.

[0067] Determining whether the vehicle is in an ignition-off state;

[0068] If so, the battery management controller (BMS) 5 wakes up at a fixed time and detects whether the voltage of the battery 10 is lower than 12V;

[0069] When the voltage of the battery 10 is lower than 12V, it is determined whether the charging gun is connected to the power battery pack 7, if not, or when the charging gun is not connected to the power battery pack 7;

[0070] The battery management controller (BMS) 5 starts a pre-charging operation mode for the battery 10;

[0071] The pre-charging working mode for the battery 10 includes: the vehicle control unit (VCU) sends a high-voltage power-on instruction to the battery management controller (BMS) 5 and sends a start instruction to the voltage converter (DCDC) 8, and the voltage converter (DCDC) 8 outputs a voltage of 13.8V to charge the battery 10.

[0072] Here, the first threshold is 12V, the second threshold is 95%, and the third threshold is 13.8V.

[0073] Step S21, when the vehicle is in a non-ignition-off state, detect whether the voltage of the battery 10 is lower than a first threshold value; if so, start the pre-charging working mode of the battery 10, send a high-voltage power-on instruction to the battery management controller (BMS) 5 and send a start instruction to the voltage converter (DCDC) 8, output a third threshold voltage, and charge the battery 10;

[0074] Determine whether the charging time exceeds a fourth threshold; if so, exit the pre-charging working mode of the battery 10, send a high-voltage power-off command to the battery management controller (BMS) 5, and the vehicle enters a sleep mode.

[0075] Specifically, when the vehicle is in a non-ignition-off state, the voltage converter (DCDC) 8 is not working, and the battery management controller (BMS) 5 detects whether the voltage of the battery 10 is lower than 12V after being woken up at a fixed time; if so, the battery management controller (BMS) 5 sends a low-battery reminder of the battery 10 to the cable and displays it on the instrument display screen, and at the same time requests the battery management controller (BMS) 5 to start the pre-charging working mode of the battery 10 to the vehicle control unit (VCU), and the vehicle networking controller (T-BOX) 11 receives the low-battery reminder of the battery 10 After the prompt signal, a text message is sent through the background server to inform the user that the battery 10 is low on power, the battery management controller (BMS) 5 starts the pre-charging working mode of the battery 10, and the vehicle control unit (VCU) sends a high-voltage power-on instruction to the battery management controller (BMS) 5 and sends a start instruction to the voltage converter (DCDC) 8. The voltage converter (DCDC) 8 outputs a voltage of 13.8V to charge the battery 10; when it is detected that the voltage of the battery 10 is not less than 12V, it returns to the determination of whether the vehicle is in an off state.

[0076] Determine whether the charging time exceeds one hour; if so, the battery management controller (BMS) 5 exits the pre-charging working mode of the battery 10, and the vehicle control unit (VCU) sends a high-voltage power-off instruction to the battery management controller (BMS) 5, and the vehicle enters the sleep mode. If not, the voltage converter (DCDC) 8 outputs a voltage of 13.8V and continues to charge the battery 10.

[0077] Here, the fourth threshold is one hour.

[0078] Step S22, when the remaining power SOC of the power battery pack 7 is not higher than the second threshold, starting the external AC charging working mode to charge the power battery pack 7;

[0079] After the external AC power supply charges the power battery pack 7, a high voltage power-on instruction is sent to the battery management controller (BMS) 5 and a start instruction is sent to the voltage converter (DCDC) 8 to output a third threshold voltage to charge the storage battery 10;

[0080] Determine whether the power battery pack 7 is fully charged; if so, exit the external AC charging working mode, send a high-voltage power-off command to the battery management controller (BMS) 5, and the vehicle enters the sleep mode.

[0081] Specifically, determining whether the vehicle is in an ignition-off state;

[0082] If so, the battery management controller (BMS) 5 wakes up at a fixed time and detects whether the voltage of the battery 10 is lower than 12V;

[0083] If yes, when the voltage of the battery 10 is lower than 12V and the charging gun is connected to the power battery pack 7, it is determined whether the remaining power SOC of the power battery pack 7 is higher than 95%;

[0084] When the remaining power SOC of the power battery pack 7 is not higher than 95%, the battery management controller (BMS) 5 turns on the external AC charging working mode to charge the power battery pack 7;

[0085] After the external AC power supply charges the power battery pack 7, the vehicle controller (VCU) sends a high-voltage power-on instruction to the battery management controller (BMS) 5 and sends a start instruction to the voltage converter (DCDC) 8, and the voltage converter (DCDC) 8 outputs a voltage of 13.8V to charge the storage battery 10;

[0086] Determine whether the power battery pack 7 is fully charged; if so, the battery management controller (BMS) 5 exits the external AC charging working mode, and the vehicle control unit (VCU) sends a high-voltage power-off instruction to the battery management controller (BMS) 5, and the vehicle enters the sleep mode. If not, return to the battery management controller (BMS) 5 to start the external AC charging working mode to charge the power battery pack 7.

[0087] Step S3, determining whether the charging time exceeds a fourth threshold;

[0088] If so, the pre-charging working mode of the battery 10 is exited, a high voltage power-off instruction is sent to the battery management controller (BMS) 5, and the vehicle enters a sleep mode.

[0089] Specifically, determining whether the charging time exceeds one hour;

[0090] If yes, the battery management controller (BMS) 5 exits the pre-charging working mode for the storage battery 10, and the vehicle control unit (VCU) sends a high voltage power-off instruction to the battery management controller (BMS) 5, and the vehicle enters the sleep mode. If no, the battery management controller (BMS) 5 returns to start the pre-charging working mode for the storage battery 10.

[0091] The vehicle battery charging method of the present invention can charge the vehicle battery by outputting a voltage through a voltage converter (DCDC) when the vehicle is in an ignition-off state. Even if a battery with a small capacity is selected, it can ensure that the vehicle can be started normally after being stored for one month, thereby effectively reducing the cost and weight of the vehicle. In addition, it can also solve the problem of starting the battery charging function when the vehicle power battery pack is connected to a charging gun or the vehicle is in an OFF state, thereby ensuring the power of the vehicle battery.

[0092] Embodiment 2

[0093] The embodiment of the present invention provides a vehicle battery charging system, such as Figure 2 As shown, the system includes a power battery pack 1, a voltage converter (DCDC) 8, and a storage battery 10.

[0094] The positive electrode of the power battery pack 1 is connected to the positive electrode of the input end of the voltage converter (DCDC) 8, and the positive electrode of the output end of the voltage converter (DCDC) 8 is connected to the positive electrode of the input end of the storage battery 10;

[0095] The negative electrode of the power battery pack 1 is connected to the negative electrode of the input end of the voltage converter (DCDC) 8, and the negative electrode of the output end of the voltage converter (DCDC) 8 is connected to the negative electrode of the input end of the storage battery 10;

[0096] The voltage converter (DCDC) 8 is used to output a third threshold voltage to charge the battery 10 .

[0097] Specifically, the voltage converter (DCDC) 8 is used to output a 13.8V voltage to charge the battery 10 .

[0098] In addition, the battery 10 is the power supply for all controllers of the vehicle, including the battery management controller (BMS) 5 in the power battery pack 7 .

[0099] Preferably, the system comprises a positive contactor 2, a pre-charge contactor 3, a pre-charge resistor 4, a negative contactor 6, and a battery management controller (BMS) 5.

[0100] The first static contact point A of the positive contactor is connected to the positive electrode of the power battery pack 1, the second static contact point B of the positive contactor is connected to the positive electrode of the input end of the voltage converter (DCDC) 8, the first control end C of the coil of the positive contactor is grounded, and the second control end D of the coil of the positive contactor is connected to the battery management controller (BMS) 5;

[0101] The first static contact E of the pre-charging contactor is connected to the positive electrode of the power battery pack 1, the second static contact F of the pre-charging contactor is connected to the first end of the pre-charging resistor 4, the second end of the pre-charging resistor 4 is connected to the positive electrode of the input end of the voltage converter (DCDC) 8, the first control end G of the coil of the pre-charging contactor is grounded, and the second control end H of the coil of the pre-charging contactor is connected to the battery management controller (BMS) 5;

[0102] The first static contact I of the negative contactor is connected to the negative electrode of the power battery pack 1, the second static contact J of the negative contactor is connected to the negative electrode of the input end of the voltage converter (DCDC) 8, the first control end K of the coil of the negative contactor is grounded, and the second control end L of the coil of the negative contactor is connected to the battery management controller (BMS) 5;

[0103] The battery management controller (BMS) 5 is used to detect whether the voltage of the battery 10 is lower than a first threshold value, to start or exit a pre-charging working mode for the battery 10, and to start or exit an external AC charging working mode.

[0104] Specifically, the battery management controller (BMS) 5 is connected to the second control terminal D of the coil of the positive contactor, the second control terminal H of the coil of the pre-charging contactor, and the second control terminal L of the coil of the negative contactor, and is used to control the closing and opening of the static contact point and the moving contact point of the contactor.

[0105] The battery management controller (BMS) 5 is used to detect whether the voltage of the battery 10 is lower than 12V, to start or exit the pre-charging working mode of the battery 10; and to start or exit the external AC charging working mode.

[0106] Preferably, the system further includes a vehicle controller (VCU) and a vehicle networking controller (T-BOX) 11.

[0107] The vehicle control unit (VCU) is connected to the battery management controller (BMS) 5 for communication via a cable, and is connected to the voltage converter (DCDC) 8 and the vehicle networking controller (T-BOX) 11 for communication via a cable;

[0108] The vehicle control unit (VCU) is used to send a high voltage power-on or power-off instruction to the battery management controller (BMS) 5;

[0109] The vehicle networking controller (T-BOX) 11 is used to send SMS information prompts to users through the background server.

[0110] Preferably, the system includes a power battery pack 7, a charger, and a charging gun.

[0111] The power battery pack 7 includes the power battery group 1, the positive contactor 2, the pre-charge contactor 3, the pre-charge resistor 4, the negative contactor 6, and the battery management controller (BMS) 5, and constitutes the power battery pack 7;

[0112] The charging gun is connected to the power battery pack 7 via the charger.

[0113] The beneficial effects brought by the technical solution disclosed in the embodiment of the present invention are:

[0114] The vehicle battery charging system of the present invention can charge the vehicle battery by outputting a voltage through a voltage converter (DCDC) when the vehicle is in the OFF state. Even if a battery with a small capacity is selected, it can ensure that the vehicle can be started normally after being stored for one month, thereby effectively reducing the cost and weight of the vehicle. In addition, it can also solve the problem of starting the battery replenishment function when the vehicle power battery pack is connected to a charging gun or the vehicle is in the OFF state, thereby ensuring the power of the vehicle battery.

[0115] Embodiment 3

[0116] The present invention provides a vehicle, which includes: a power battery pack 1, a voltage converter (DCDC) 8, a storage battery 10,

[0117] The positive electrode of the power battery pack 1 is connected to the positive electrode of the input end of the voltage converter (DCDC) 8, and the positive electrode of the output end of the voltage converter (DCDC) 8 is connected to the positive electrode of the input end of the storage battery 10;

[0118] The negative electrode of the power battery pack 1 is connected to the negative electrode of the input end of the voltage converter (DCDC) 8, and the negative electrode of the output end of the voltage converter (DCDC) 8 is connected to the negative electrode of the input end of the storage battery 10;

[0119] The voltage converter (DCDC) 8 is used to output a third threshold voltage to charge the battery 10 .

[0120] In some embodiments, the system includes a positive contactor 2, a pre-charge contactor 3, a pre-charge resistor 4, a negative contactor 6, and a battery management controller (BMS) 5.

[0121] The first static contact point A of the positive contactor is connected to the positive electrode of the power battery pack 1, the second static contact point B of the positive contactor is connected to the positive electrode of the input end of the voltage converter (DCDC) 8, the first control end C of the coil of the positive contactor is grounded, and the second control end D of the coil of the positive contactor is connected to the battery management controller (BMS) 5;

[0122] The first static contact E of the pre-charging contactor is connected to the positive electrode of the power battery pack 1, the second static contact F of the pre-charging contactor is connected to the first end of the pre-charging resistor 4, the second end of the pre-charging resistor 4 is connected to the positive electrode of the input end of the voltage converter (DCDC) 8, the first control end G of the coil of the pre-charging contactor is grounded, and the second control end H of the coil of the pre-charging contactor is connected to the battery management controller (BMS) 5;

[0123] The first static contact I of the negative contactor is connected to the negative electrode of the power battery pack 1, the second static contact J of the negative contactor is connected to the negative electrode of the input end of the voltage converter (DCDC) 8, the first control end K of the coil of the negative contactor is grounded, and the second control end L of the coil of the negative contactor is connected to the battery management controller (BMS) 5;

[0124] The battery management controller (BMS) 5 is used to detect whether the voltage of the battery 10 is lower than a first threshold value, to start or exit a pre-charging working mode for the battery 10, and to start or exit an external AC charging working mode.

[0125] In some embodiments, the system further includes a vehicle controller (VCU), a vehicle networking controller 11,

[0126] The vehicle control unit (VCU) is connected to the battery management controller (BMS) 5 for communication via a cable, and is connected to the voltage converter (DCDC) 8 and the vehicle networking controller (T-BOX) 11 for communication via a cable;

[0127] The vehicle control unit (VCU) is used to send a high voltage power-on or power-off instruction to the battery management controller (BMS) 5;

[0128] The vehicle networking controller (T-BOX) 11 is used to send short message information to the user through the background server.

[0129] In some embodiments, the system includes a power battery pack 7, a charger, and a charging gun.

[0130] The power battery pack 7 includes the power battery group 1, the positive contactor 2, the pre-charge contactor 3, the pre-charge resistor 4, the negative contactor 6, and the battery management controller (BMS) 5, and constitutes the power battery pack 7;

[0131] The charging gun is connected to the power battery pack 7 via the charger.

[0132] All the above optional technical solutions can be arbitrarily combined to form optional embodiments of the present invention, which will not be described in detail here.

[0133] Although the preferred embodiments of the present application have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the embodiments of the present application.

[0134] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

[0135] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

[0136] The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in this field.

Claims

1. A vehicle battery charging method, characterized in that: The method comprises: Determining whether the vehicle is in an ignition-off state; If so, detecting whether the battery voltage is lower than a first threshold; When the battery voltage is lower than a first threshold and the charging gun is connected to the power battery pack, determining whether the remaining power of the power battery pack is higher than a second threshold; When the remaining power of the power battery pack is higher than a second threshold, or when the charging gun is not connected to the power battery pack, starting a pre-charging working mode for the battery; The pre-charging working mode for the storage battery includes: sending a high-voltage power-on instruction to the battery management controller and sending a start instruction to the voltage converter to output a third threshold voltage to charge the storage battery; When the vehicle is in a non-ignition-off state, detecting whether the battery voltage is lower than a first threshold value; if so, starting a pre-charging working mode for the battery, sending a high-voltage power-on instruction to the battery management controller and a start instruction to the voltage converter, outputting a third threshold voltage, and charging the battery; when detecting that the battery voltage is not lower than the first threshold value, returning to the step of determining whether the vehicle is in an ignition-off state; Determine whether the charging time exceeds a fourth threshold; if so, exit the pre-charging working mode of the battery, send a high-voltage power-off command to the battery management controller, and the vehicle enters a sleep mode; if not, the voltage converter outputs a voltage to continue charging the battery.

2. The vehicle battery charging method according to claim 1, characterized in that: After charging the battery, the method further comprises: Determining whether the charging time exceeds a fourth threshold; If so, exit the pre-charging working mode of the battery, send a high voltage power-off instruction to the battery management controller, and the vehicle enters the sleep mode.

3. The vehicle battery charging method according to claim 1, characterized in that: The method comprises: When the remaining power of the power battery pack is not higher than a second threshold, starting the external AC charging working mode to charge the power battery pack; After the external AC power source charges the power battery pack, a high-voltage power-on instruction is sent to the battery management controller and a start instruction is sent to the voltage converter to output a third threshold voltage to charge the storage battery; Determine whether the power battery pack is fully charged; if so, exit the external AC charging working mode, send a high-voltage power-off command to the battery management controller, and the vehicle enters the sleep mode.

4. The vehicle battery charging method according to claim 1, characterized in that: Before starting the pre-charging working mode of the storage battery, the method includes: Determine whether the remaining power of the power battery pack is greater than a fifth threshold, and whether the minimum voltage of the power battery pack is greater than a sixth threshold; if so, start the pre-charging working mode for the battery; if not, do not start the pre-charging working mode for the battery.

5. A vehicle battery charging system for implementing the method as claimed in claim 1, characterized in that: The system includes a power battery pack, a voltage converter, and a storage battery. The positive electrode of the power battery pack is connected to the positive electrode of the voltage converter input terminal, and the positive electrode of the voltage converter output terminal is connected to the positive electrode of the battery input terminal; The negative electrode of the power battery pack is connected to the negative electrode of the voltage converter input terminal, and the negative electrode of the voltage converter output terminal is connected to the negative electrode of the battery input terminal; The voltage converter is used to output a third threshold voltage to charge the battery.

6. The vehicle battery charging system according to claim 5, characterized in that: The system includes a positive contactor, a pre-charge contactor, a pre-charge resistor, a negative contactor, and a battery management controller. The first static contact of the positive contactor is connected to the positive electrode of the power battery pack, the second static contact of the positive contactor is connected to the positive electrode of the voltage converter input terminal, the first control terminal of the coil of the positive contactor is grounded, and the second control terminal of the coil of the positive contactor is connected to the battery management controller; The first static contact of the pre-charging contactor is connected to the positive electrode of the power battery pack, the second static contact of the pre-charging contactor is connected to the first end of the pre-charging resistor, the second end of the pre-charging resistor is connected to the positive electrode of the voltage converter input end, the first control end of the coil of the pre-charging contactor is grounded, and the second control end of the coil of the pre-charging contactor is connected to the battery management controller; The first static contact of the negative contactor is connected to the negative electrode of the power battery pack, the second static contact of the negative contactor is connected to the negative electrode of the voltage converter input terminal, the first control terminal of the coil of the negative contactor is grounded, and the second control terminal of the coil of the negative contactor is connected to the battery management controller; The battery management controller is used to detect whether the battery voltage is lower than a first threshold value, to start or exit a pre-charging working mode for the battery; and to start or exit an external AC charging working mode.

7. The vehicle battery charging system according to claim 6, characterized in that: The system also includes a vehicle controller and a vehicle networking controller. The vehicle controller is connected to the battery management controller for communication via a cable, and is connected to the voltage converter and the vehicle networking controller for communication via a cable; The vehicle controller is used to send a high voltage power-on or power-off instruction to the battery management controller; The Internet of Vehicles controller is used to send text messages to users through a background server.

8. The vehicle battery charging system according to claim 7, characterized in that: The system includes a power battery pack, a charger, and a charging gun. The power battery pack includes the power battery group, the positive contactor, the pre-charge contactor, the pre-charge resistor, the negative contactor, and the battery management controller, and constitutes the power battery pack; The charging gun is connected to the power battery pack via the charger.

9. A vehicle, characterized in that: The vehicle comprises a vehicle battery charging system as claimed in any one of claims 5 to 8.

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