Vehicle low-voltage charging system and vehicle

Abstract

The utility model discloses a vehicle low-voltage charging system and a vehicle. The vehicle low-voltage charging system comprises a low-voltage storage battery; the direct-current converter is electrically connected with the low-voltage storage battery; the high-voltage distribution box is electrically connected with the direct-current converter; the motor controller is electrically connected with the high-voltage distribution box; the motor generator is electrically connected with the motor controller; wherein the high-voltage distribution box is used for distributing high-voltage electric energy to the motor controller and distributing recycled electric energy provided by the motor controller to the direct-current converter so as to supplement electricity to the low-voltage storage battery. The low-voltage storage battery is charged by using the electric energy recovered by the motor generator, multiple times of energy conversion in the charging process is avoided, the energy loss is reduced, and the energy utilization rate of the system is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicles, in particular to a vehicle low-voltage power supplement system and a vehicle. Background Art

[0002] The application of three important technical routes, namely hybrid power, pure electric power and hydrogen fuel cell, in the field of heavy-duty trucks has gradually deepened. As the key components of new energy heavy-duty trucks, high-voltage components need to be powered by low-voltage electricity, that is, high voltage is controlled by low voltage. Low-voltage power supply is usually provided by low-voltage batteries. In order to ensure that the low-voltage batteries have continuous power, they need to be recharged.

[0003] In the related technologies, in hybrid heavy-duty trucks, the methods for recharging the low-voltage battery include recharging through the engine driving the generator (hybrid models) and recharging from the power battery pack through a DC converter (all new energy models). The recharging strategy is mainly based on closed-loop control of voltage or power.

[0004] However, the process of the engine driving the generator to replenish the low-voltage battery involves multiple energy conversions, and each conversion will result in energy loss, resulting in poor efficiency in the utilization of the replenished energy. Utility Model Content

[0005] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model proposes a vehicle low-voltage charging system, which uses the electric energy recovered by the electric generator to charge the low-voltage battery, avoids multiple energy conversions during the charging process, reduces energy loss, and improves the energy utilization rate of the system.

[0006] The utility model also provides a vehicle.

[0007] According to the first aspect of the present invention, the vehicle low-voltage power supplement system includes: a low-voltage battery; a DC converter, the DC converter is electrically connected to the low-voltage battery; a high-voltage distribution box is electrically connected to the DC converter; a motor controller, the motor controller is electrically connected to the high-voltage distribution box; an electric generator, the electric generator is electrically connected to the motor controller; wherein the high-voltage distribution box is used to distribute high-voltage electric energy to the motor controller, and to distribute the recovered electric energy provided by the motor controller to the DC converter, so as to supplement the low-voltage battery.

[0008] According to the vehicle low-voltage power replenishment system of the embodiment of the utility model, the low-voltage battery is replenished by using the electric energy recovered by the electric generator, thereby avoiding multiple energy conversions during the power replenishment process, reducing energy losses, and improving the energy utilization rate of the system.

[0009] According to some embodiments of the utility model, the DC converter includes: a high-voltage interface, a first power adjustment module, an output module and a control module, the high-voltage interface is electrically connected to the high-voltage distribution box, the first power adjustment module is connected in series between the output module and the high-voltage interface and is electrically connected to the control module.

[0010] According to some embodiments of the utility model, the DC converter also includes: a low-voltage interface, a first relay, a second relay and a second power adjustment module, the low-voltage interface is used to connect the charging interface, the second power adjustment module is connected in series between the output module and the low-voltage interface, the second relay is connected in series between the second power adjustment module and the low-voltage interface, the first relay is connected in series between the first power adjustment module and the high-voltage interface, and the first relay, the second relay and the second power adjustment module are all electrically connected to the control module.

[0011] According to some embodiments of the utility model, the DC converter also includes: a first protection circuit and a second protection circuit, the first protection circuit is connected in series between the first relay and the first power adjustment module, and the second protection circuit is connected in series between the second relay and the second power adjustment module.

[0012] According to some embodiments of the present invention, the first power adjustment module includes: a step-down module and a power module, the step-down module is electrically connected to the power module, the step-down module is used to reduce the voltage of the electric energy input from the high-voltage interface, and the power module is used to reduce the power of the electric energy input from the high-voltage interface.

[0013] According to some embodiments of the present utility model, the vehicle low-voltage power compensation system also includes a power battery pack, which is connected to the high-voltage distribution box, and the high-voltage distribution box is used to distribute the high-voltage electric energy provided by the power battery pack to the motor controller or the DC converter.

[0014] According to some embodiments of the utility model, the vehicle low-voltage power compensation system also includes: a vehicle controller, the low-voltage battery has a low-voltage battery management unit, the power battery pack has a high-voltage battery management unit, the vehicle controller is electrically connected to the motor controller, the high-voltage distribution box, the low-voltage battery management unit, the high-voltage battery management unit and the DC converter, respectively, and the vehicle controller is used to control the output power of the DC converter.

[0015] According to some embodiments of the utility model, the vehicle low-voltage power compensation system also includes: a charging interface, the charging interface is electrically connected to the high-voltage distribution box and / or the DC converter, the high-voltage distribution box is electrically connected to the power battery pack, the high-voltage distribution box is used to distribute the electric energy provided by the external power supply to the power battery pack, and / or the DC converter is used to adjust the electric energy provided by the external power supply and output it to the low-voltage battery.

[0016] According to some embodiments of the utility model, the charging interface includes: a high-voltage charging interface and a low-voltage charging interface, the high-voltage charging interface and the high-voltage distribution box are electrically connected through a high-voltage wiring harness, and the low-voltage charging interface and the DC converter are electrically connected through a low-voltage wiring harness.

[0017] A vehicle according to an embodiment of the second aspect of the utility model includes: the vehicle low-voltage power supplement system.

[0018] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0020] Figure 1 is a schematic diagram of a low-voltage power supplement system for a vehicle according to an embodiment of the utility model;

[0021] Figure 2 is an electrical schematic diagram of a DC converter according to an embodiment of the utility model;

[0022] Figure 3 It is a control logic diagram of a vehicle low-voltage power supplement system according to an embodiment of the utility model.

[0023] Reference numerals:

[0024] 100. Vehicle low-voltage charging system;

[0025] 11. Electric generator; 12. Motor controller;

[0026] 20. High voltage distribution box;

[0027] 30. Power battery pack;

[0028] 40. DC converter; 41. high voltage interface; 411. first power adjustment module; 412. first relay; 413. first protection circuit; 42. low voltage interface; 421. second power adjustment module; 422. second relay; 423. second protection circuit; 43. output module; 44. control module; 45. control interface;

[0029] 50. Low voltage battery;

[0030] 60. Charging interface; 61. High voltage charging interface; 62. Low voltage charging interface;

[0031] 70. Vehicle controller. DETAILED DESCRIPTION

[0032] The embodiments of the present utility model are described in detail below. The embodiments described with reference to the accompanying drawings are exemplary. The embodiments of the present utility model are described in detail below.

[0033] Reference below Figure 1-Figure 3 A low-voltage charging system 100 for a vehicle according to an embodiment of the present invention is described, and the present invention also provides a vehicle.

[0034] Reference Figure 1 As shown, the vehicle low-voltage power supplement system 100 of the embodiment of the utility model includes: a low-voltage battery 50 , a DC converter 40 , a high-voltage distribution box 20 , a motor controller 12 and an electric generator 11 .

[0035] Specifically, the low-voltage battery 50 may be a 24V battery for supplying power to high-voltage components.

[0036] The DC converter 40 can convert one DC voltage into another DC voltage to meet the voltage requirements of different components, so that a single power supply can drive multiple devices that require different voltages, thereby improving the versatility and flexibility of the power supply. The DC converter 40 and the low-voltage battery 50 are electrically connected, and the DC converter 40 can convert high-voltage electrical energy into low-voltage electrical energy and transmit it to the low-voltage battery 50.

[0037] The high-voltage distribution box 20 is electrically connected to the DC converter 40. The high-voltage distribution box 20 is responsible for the power distribution and management in the high-voltage system and controls the charging and discharging processes in the high-voltage system. The high-voltage distribution box 20 can distribute the high-voltage electric energy and transmit it to the low-voltage battery 50 through the DC converter 40.

[0038] The motor controller 12 is electrically connected to the high-voltage distribution box 20 , and the electric generator 11 is electrically connected to the motor controller 12 . The motor controller 12 is electrically connected to the electric generator 11 , and can control the direction, speed, angle, response time, etc. of the electric generator 11 .

[0039] During normal vehicle driving, the electric generator 11 is used as an electric motor. When the vehicle brakes, the motor controller 12 detects and converts the electric motor into a generator, converting the kinetic energy of the wheels into electrical energy for recovery.

[0040] The high-voltage distribution box 20 is used to distribute high-voltage electric energy to the motor controller 12, and to distribute the recovered electric energy provided by the motor controller 12 to the DC converter 40, so as to recharge the low-voltage battery 50. Specifically, the high-voltage distribution box 20 distributes high-voltage electric energy to the motor controller 12 to ensure the normal operation of the motor controller 12, and can also distribute the electric energy (i.e., recovered electric energy) recovered by the electric generator 11 when the vehicle is braked to the DC converter 40, and the DC converter 40 then converts the high-voltage electric energy into low-voltage electric energy suitable for the low-voltage battery 50, so as to recharge the low-voltage battery 50.

[0041] In this way, the low-voltage battery 50 can be recharged without using an engine to drive a generator, and the electric energy recovered by the electric generator 11 can be directly utilized, thereby reducing the waste of electric energy recovered by the electric generator 11, avoiding multiple energy conversions during the charging process, reducing energy loss, and improving the energy utilization rate of the system.

[0042] Therefore, by using the electric energy recovered by the electric generator 11 to supplement the low-voltage battery 50, multiple energy conversions during the supplement process can be avoided, energy losses can be reduced, and the energy utilization rate of the system can be improved.

[0043] Reference Figure 2 As shown, the DC converter 40 includes: a high-voltage interface 41, a first power adjustment module 411, an output module 43 and a control module 44, the high-voltage interface 41 is electrically connected to the high-voltage distribution box 20, the first power adjustment module 411 is connected in series between the output module 43 and the high-voltage interface 41 and is electrically connected to the control module 44.

[0044] Among them, the high-voltage interface 41 can be connected to high-voltage electric energy. Since the high-voltage interface 41 is electrically connected to the high-voltage distribution box 20, and the high-voltage distribution box 20 is electrically connected to the motor controller 12, the high-voltage interface 41 can input the high-voltage electric energy recovered by the electric generator 11 controlled by the motor controller 12.

[0045] The first power adjustment module 411 is connected to the high voltage interface 41 , and the output module 43 is electrically connected to the low voltage battery 50 . The first power adjustment module 411 is used to reduce the voltage and power of the high voltage electric energy or the recovered electric energy provided by the high voltage interface 41 .

[0046] The control module 44 is electrically connected to the first power adjustment module 411, and the control module 44 sends a control signal to the first power adjustment module 411 to adjust the output voltage and power of the first power adjustment module 411. In addition, the DC converter 40 also includes a control interface 45, and the control module 44 is electrically connected to the vehicle controller (VCU) through the control interface 45.

[0047] Reference Figure 2 As shown, the DC converter 40 also includes: a low voltage interface 42, a first relay 412, a second relay 422 and a second power adjustment module 421, the low voltage interface 42 is used to connect the charging interface 60, the second power adjustment module 421 is connected in series between the output module 43 and the low voltage interface 42, the second relay 422 is connected in series between the second power adjustment module 421 and the low voltage interface 42, the first relay 412 is connected in series between the first power adjustment module 411 and the high voltage interface 41, and the first relay 412, the second relay 422 and the second power adjustment module 421 are all electrically connected to the control module 44.

[0048] Among them, the low-voltage interface 42 can be connected to a low-voltage power supply. Since the low-voltage interface 42 and the charging interface 60 are electrically connected, the low-voltage interface 42 can input the low-voltage electric energy input by the charging interface 60. The electric energy charged by the charging interface 60 refers to the vehicle being charged through an external charging pile and a charging socket.

[0049] The first relay 412 and the second relay 422 are both electrically connected to the control module 44 , and the control module 44 can control the first relay 412 and the second relay 422 , thereby controlling the on-off of the circuit.

[0050] The second power adjustment module 421 is connected in series between the low-voltage interface 42 and the output module 43, the output module 43 is electrically connected to the low-voltage battery 50, the control module 44 is electrically connected to the second power adjustment module 421, and the second power adjustment module 421 is controlled by the control module 44. It can stabilize the voltage and limit the current of the low-voltage electricity input by the charging interface 60, and then output it to the low-voltage battery 50 via the output module 43, thereby replenishing the low-voltage battery 50.

[0051] Since the second relay 422 is connected in series between the second power adjustment module 421 and the low-voltage interface 42, and the first relay 412 is connected in series between the first power adjustment module 411 and the high-voltage interface 41, when the low-voltage interface 42 inputs the low-voltage electric energy charged by the charging interface 60, the first relay 412 can control the circuit to be closed, and only the low-voltage interface 42 in the DC converter 40 can connect the circuit, and the second power adjustment module 421 stabilizes the low-voltage electricity input by the charging interface 60 and limits the current, and then outputs it to the low-voltage battery 50 through the output module 43, thereby replenishing the low-voltage battery 50. When the high-voltage interface 41 inputs high-voltage electric energy or recovers electric energy, the second relay 422 can control the circuit to be closed, and the first power adjustment module 411 adjusts the high-voltage electric energy to the low-voltage electric energy that meets the needs of the low-voltage battery 50, and then outputs it to the low-voltage battery 50 through the output module 43, thereby replenishing the low-voltage battery 50.

[0052] Reference Figure 2 As shown, the DC converter 40 also includes: a first protection circuit 413 and a second protection circuit 423, the first protection circuit 413 is connected in series between the first relay 412 and the first power adjustment module 411, and the second protection circuit 423 is connected in series between the second relay 422 and the second power adjustment module 421.

[0053] The first protection circuit 413 can monitor the current and voltage in the circuit to prevent the current or voltage from exceeding the set value of the circuit. When the current or voltage exceeds the safe range, the first protection circuit 413 can disconnect the circuit in time to prevent damage to the DC converter 40. Similarly, when the circuit is short-circuited or the voltage is lower than the safe range, the first protection circuit 413 can also disconnect the circuit to prevent damage to the DC converter 40.

[0054] Similarly, the second protection circuit 423 can monitor the current and voltage in the circuit to prevent the current or voltage from exceeding the set value of the circuit. When the current or voltage exceeds the safe range, the second protection circuit 423 can disconnect the circuit in time to prevent damage to the DC converter 40. Similarly, when the circuit is short-circuited or the voltage is lower than the safe range, the second protection circuit 423 can also disconnect the circuit to prevent damage to the DC converter 40.

[0055] Reference Figure 2 As shown, the first power adjustment module 411 includes: a step-down module and a power module, the step-down module is electrically connected to the power module, the step-down module is used to reduce the voltage of the electric energy input from the high-voltage interface 41, and the power module is used to reduce the power of the electric energy input from the high-voltage interface 41.

[0056] That is to say, the electric energy can be either high-voltage electric energy or low-voltage electric energy. The high-voltage electric energy or recovered electric energy input from the high-voltage interface 41 is converted into low-voltage electric energy suitable for the low-voltage battery 50 through the step-down module, and the high-voltage electric energy or recovered electric energy input from the high-voltage interface 41 is converted into low-power electric energy suitable for the low-voltage battery 50 through the power module.

[0057] Reference Figure 1 As shown, the vehicle low-voltage power supplement system also includes a power battery pack 30 , which is connected to a high-voltage distribution box 20 , and the high-voltage distribution box 20 is used to distribute the high-voltage electric energy provided by the power battery pack 30 to the motor controller 12 or the DC converter 40 .

[0058] The power battery pack 30 can be used as a power source to provide high-voltage electric energy to the entire vehicle or store electric energy. For example, kinetic energy in the braking recovery mode can be converted into electric energy and stored in the power battery pack 30 .

[0059] The high-voltage electric energy of the power battery pack 30 can also be distributed to the motor controller 12 to support the normal operation of the electric generator. When the electric generator 11 is not in the recovery mode, the low-voltage battery 50 cannot be recharged. The high-voltage electric energy of the power battery pack 30 can be distributed to the DC converter 40. The DC converter 40 converts the high-voltage electric energy into low-voltage electric energy to recharge the low-voltage battery 50. In this way, the low-voltage battery 50 can be recharged using electric energy from different places in the vehicle under different working conditions, making the vehicle low-voltage recharging system 100 more intelligent.

[0060] It should be noted that when the power battery pack 30 is used for power replenishment, the power level of the power battery pack 30 needs to be greater than the minimum discharge threshold to avoid affecting the performance and service life of the power battery pack 30 .

[0061] Reference Figure 1 As shown, the vehicle low-voltage power supplement system also includes: a vehicle controller 70, the low-voltage battery 50 has a low-voltage battery management unit, the power battery pack 30 has a high-voltage battery management unit, and the vehicle controller 70 is electrically connected to the motor controller 12, the high-voltage distribution box 20, the low-voltage battery management unit, the high-voltage battery management unit and the DC converter 40.

[0062] The vehicle controller 70 can control the operation of each execution controller according to the vehicle signal and the information feedback of each execution component. For example, the vehicle controller 70 is electrically connected to the DC converter 40. Through the control interface 45 of the vehicle controller 70 and the DC converter 40, the selected power replenishment method can be transmitted to the control module 44. The control module 44 then sends a control signal to the first power adjustment module 411 or the second power adjustment module 421 according to the received power replenishment method, thereby adjusting the voltage and output power of the output module 43 to meet the voltage and power requirements under the current working conditions. Figure 1 In the figure, the solid line represents high voltage, the dashed line represents the control line of the vehicle controller 70 for other components, and the dot-dash line represents low voltage.

[0063] The low-voltage battery management unit can monitor the voltage, current, temperature and other parameters of the low-voltage battery in real time. The low-voltage battery management unit is electrically connected to the vehicle controller 70. When the low-voltage battery 50 is low on power, the low-voltage battery management unit can provide feedback to the vehicle controller 70. The vehicle controller 70 selects an appropriate charging method to recharge the low-voltage battery 50 according to the vehicle condition.

[0064] Similarly, the high-voltage battery management unit can monitor the voltage, current, temperature and other parameters of the power battery pack 30 in real time. The high-voltage battery management unit is electrically connected to the vehicle controller 70. When the low-voltage battery 50 is low on power, the high-voltage battery management unit monitors the power of the power battery pack 30 and feeds back to the vehicle controller 70. The vehicle controller 70 determines whether the power of the power battery pack 30 meets the requirements for recharging the low-voltage battery, and selects an appropriate method to recharge the low-voltage battery 50 according to the vehicle condition.

[0065] In addition, the vehicle controller 70 is electrically connected to the high-voltage distribution box 20, and the electric energy distribution method of the high-voltage distribution box 20 is controlled according to the selected power replenishment method. For example, when using recycled electric energy for power replenishment, the high-voltage distribution box 20 is controlled to distribute the recycled electric energy provided by the motor controller 12 to the DC converter 40. For another example, when using the power battery pack 30 for power replenishment, the high-voltage distribution box 20 is controlled to distribute the high-voltage electric energy provided by the power battery pack 30 to the DC converter 40.

[0066] Reference Figure 1 As shown, the vehicle low-voltage power supplement system also includes: a charging interface 60, the charging interface 60 is electrically connected to the high-voltage distribution box 20 and / or the DC converter 40, the high-voltage distribution box 20 and the power battery pack 30 are electrically connected, the high-voltage distribution box 20 is used to distribute the electric energy provided by the external power supply to the power battery pack 30, and / or the DC converter 40 is used to adjust the electric energy provided by the external power supply and output it to the low-voltage battery 50. The charging interface 60 is electrically connected to the high-voltage distribution box 20, and the high-voltage distribution box 20 is electrically connected to the power battery pack 30. In this way, the electric energy provided by the external power supply can be distributed to the power battery pack 30 by the high-voltage distribution box 20, completing the vehicle charging process.

[0067] The charging interface 60 is electrically connected to the DC converter 40, and the DC converter 40 is electrically connected to the low-voltage battery 50. The electric energy provided by the external power supply can be distributed to the low-voltage battery 50 by the DC converter 40. That is to say, when the vehicle is charging, the low-voltage battery 30 can also be recharged with the electric energy provided by the external power supply. In this way, the low-voltage battery 30 can also be recharged when the vehicle is parked, making the vehicle low-voltage recharging system 100 more intelligent.

[0068] The charging interface 60 includes: a high-voltage charging interface 61 and a low-voltage charging interface 62. The high-voltage charging interface 61 and the high-voltage distribution box 20 are electrically connected through a high-voltage wiring harness, and the low-voltage charging interface 62 and the DC converter 40 are electrically connected through a low-voltage wiring harness. In this way, the high-voltage electricity input by the motor controller 12, the power battery pack 30 and the charging interface 60 can be input into the DC converter 40 through the high-voltage distribution box 20 and connected to the high-voltage interface 41 in the DC converter 40, while the low-voltage electricity input by the low-voltage charging interface 62 is directly electrically connected to the low-voltage interface 42 of the DC converter 40.

[0069] The high-voltage distribution box 20 includes a distribution controller and a plurality of relays. The distribution controller is connected to the vehicle controller. The distribution controller realizes the distribution of electric energy by controlling the on and off of the plurality of relays.

[0070] Reference Figure 3 As shown, the charging methods of the low-voltage battery 30 are divided into: a recovery mode, an external charging mode, and a non-recovery mode and a non-external charging mode.

[0071] When the vehicle controller 70 detects that the power of the low-voltage battery 50 is lower than the first threshold, if the vehicle controller 70 determines that the charging mode is the recovery mode according to the current vehicle condition, the vehicle controller 70 controls the electric generator 11 to charge the low-voltage battery 50, and the charging power is the first power, and the charging is stopped when the power of the low-voltage battery 50 reaches the second threshold. Specifically, the recovery mode refers to the electric generator 11 being in a recovery state, such as braking recovery or coasting recovery, the motor switches to a generator, and the kinetic energy is recovered as electrical energy. At this time, the charging path is: electric generator 11-motor controller 12-high-voltage distribution box 20-DC converter 40-low-voltage battery 50.

[0072] Furthermore, when the vehicle controller 70 detects that the power level of the low-voltage battery 50 is lower than the third threshold, if the vehicle controller 70 determines that the charging mode is a non-recovery mode and a non-external charging mode according to the current vehicle condition, the vehicle controller 70 controls the power battery pack 30 to charge the low-voltage battery 50, and the charging power is the second power, and the charging is stopped when the power level of the low-voltage battery 50 reaches the fourth threshold. Specifically, the non-recovery mode and the non-external charging mode means that the electric generator 11 is not in a recovery state and the vehicle is not in an external charging state, and there is no other electric energy to supply the low-voltage battery 50, and the power battery pack 30 needs to be used to charge the low-voltage battery 50. At this time, the charging path is: power battery pack 30-high-voltage distribution box 20-DC converter 40-low-voltage battery 50.

[0073] Also, when the vehicle controller 70 detects that the power level of the low-voltage battery 50 is lower than the fifth threshold, if the vehicle controller 70 determines that the charging method is the external charging mode based on the current vehicle condition, the vehicle controller 70 controls the low-voltage battery 50 to be charged through the high-voltage charging interface 61, and the charging power is the third power, and the charging is stopped when the sixth threshold is reached. Specifically, the external charging mode means that the vehicle is in an external charging state, at which time the vehicle is stationary and is charged through the charging interface 60. When the vehicle controller 70 detects that the power of the low-voltage battery 50 is lower than the fifth threshold, the vehicle controller 70 controls the low-voltage battery 50 to be recharged through the high-voltage charging interface 61. At this time, the recharge path is: external power supply-high-voltage charging interface 61-high-voltage distribution box 20-DC converter 40-low-voltage battery 50; or, when the vehicle controller 70 detects that the power of the low-voltage battery 50 is lower than the seventh threshold, if the vehicle controller 70 determines that the recharge method is the external charging mode according to the current vehicle condition, the vehicle controller 70 controls the low-voltage battery 50 to be recharged through the low-voltage charging interface 62, and the recharge power is the fourth power, and the recharge stops when the eighth threshold is reached. At this time, the recharge path is: external power supply-low-voltage charging interface 62-DC converter 40-low-voltage battery 50.

[0074] It should be noted that the first threshold value, the second threshold value, etc. are not fixed values ​​and can be adjusted according to actual conditions. However, since the recovery mode utilizes the process of vehicle braking or coasting, the use of the electric generator 11 to power the low-voltage battery 50 does not require additional energy consumption or occupy components. Therefore, when recharging the low-voltage battery 50, it is preferred to use the recovery mode to recharge. The electric generator 11 can be used to recharge the low-voltage battery 50 when the power is low. The second threshold reached by the recharge is also the highest, and the electric generator 11 can be recharged as much as possible.

[0075] The electric energy of the power battery pack 30 is mainly used to drive the vehicle, and it is necessary to avoid using the power battery pack 30 as much as possible. Therefore, the power battery pack 30 can only be used to replenish power when the low-voltage battery 50 is low on power. The fourth threshold reached by replenishing power is the lowest, and excessive use of the power battery pack 30 is avoided.

[0076] When using external charging power for replenishment, the vehicle's own power is not used, so the replenishment reaches a moderate level between the sixth threshold and the eighth threshold, but the threshold for replenishment using the high-voltage charging interface 61 is greater than the threshold for replenishment using the low-voltage charging interface 62.

[0077] That is, the first threshold < the fifth threshold < the seventh threshold < the third threshold, the second threshold > the sixth threshold > the eighth threshold > the fourth threshold,

[0078] Moreover, according to different priorities of the power replenishment modes, the power also changes from large to small, that is, the first power> the third power> the fourth power> the second power.

[0079] In summary, refer to Figure 3 As shown, the control logic of the vehicle low-voltage charging system 100 is as follows: the vehicle controller 70 monitors the operation mode. If the power of the low-voltage battery 50 is lower than the first threshold and is in the recovery mode, the vehicle controller 70 uses the electric generator 11 to charge the low-voltage battery 50, and controls the output power of the DC converter 40 to be the first power through the vehicle controller 70. The charging path is: electric generator 11-high-voltage distribution box 20-DC converter 40-low-voltage battery 50. After charging, the power of the low-voltage battery 50 is monitored again. If the power of the low-voltage battery 50 does not reach the second threshold, the charging continues. If the second threshold is reached, the process ends. If the power of the low-voltage battery 50 is higher than or equal to the first threshold, the process ends and a new judgment is made.

[0080] If the power level of the low-voltage battery 50 is lower than the fifth threshold and is in external charging mode, the vehicle controller 70 controls the low-voltage battery 50 to be recharged through the high-voltage charging interface 61, and controls the output power of the DC converter 40 to be the third power through the vehicle controller 70. The recharging path is: external charging pile-high-voltage charging interface 61-high-voltage distribution box 20-DC converter 40-low-voltage battery 50. After recharging, the power level of the low-voltage battery 50 is monitored again. If the power level of the low-voltage battery 50 has not reached the sixth threshold, the recharging continues, and the process ends when the sixth threshold is reached.

[0081] If the power level of the low-voltage battery 50 is higher than or equal to the fifth threshold, it is determined whether the power level of the low-voltage battery 50 is lower than the seventh threshold. If it is lower than the seventh threshold, the vehicle controller 70 controls the low-voltage battery 50 to be recharged through the low-voltage charging interface 62, and controls the output power of the DC converter 40 to be the fourth power through the vehicle controller 70. The recharge path is: external charging pile-low-voltage charging interface 62-DC converter 40-low-voltage battery 50. After recharging, the power level of the low-voltage battery 50 is monitored again. If the power level of the low-voltage battery 50 does not reach the eighth threshold, the recharge continues, and the process ends when the eighth threshold is reached.

[0082] If the power level of the low-voltage battery 50 is higher than or equal to the seventh threshold, the process is terminated and a new determination is performed.

[0083] If the power level of the low-voltage battery 50 is lower than the third threshold and it is in non-recovery mode and non-external charging mode, the vehicle controller 70 controls the power battery pack 30 to recharge the low-voltage battery 50, and controls the output power of the DC converter 40 to be the second power. The recharge path is: power battery pack 30-high-voltage distribution box 20-DC converter 40-low-voltage battery 50. After recharging, the power level of the low-voltage battery 50 is monitored again. If the power level of the low-voltage battery 50 has not reached the fourth threshold, recharging continues. When the fourth threshold is reached, the process ends.

[0084] If the power level of the low-voltage battery 50 is higher than or equal to the third threshold, the low-voltage battery 50 does not need to be recharged, and the process ends.

[0085] The step of monitoring the power level of the low-voltage battery 50 after the power replenishment in the above process may be repeated multiple times until the power level of the low-voltage battery 50 meets the threshold requirement.

[0086] The vehicle according to the embodiment of the second aspect of the utility model includes: a vehicle low-voltage power supplement system 100 .

[0087] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0088] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example.

[0089] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A vehicle low-voltage power supply system, characterized in that: include: Low voltage battery; A DC converter, the DC converter is electrically connected to the low-voltage battery; A high-voltage distribution box, the high-voltage distribution box is electrically connected to the DC converter; A motor controller, the motor controller is electrically connected to the high-voltage distribution box; an electric generator, the electric generator being electrically connected to the motor controller; The high-voltage distribution box is used to distribute high-voltage electric energy to the motor controller, and to distribute the recovered electric energy provided by the motor controller to the DC converter to replenish the low-voltage battery.

2. The vehicle low-voltage power supply system according to claim 1, characterized in that: The DC converter includes: a high-voltage interface, a first power adjustment module, an output module and a control module. The high-voltage interface is electrically connected to the high-voltage distribution box. The first power adjustment module is connected in series between the output module and the high-voltage interface and is electrically connected to the control module.

3. The vehicle low-voltage power supply system according to claim 2, characterized in that: The DC converter also includes: a low-voltage interface, a first relay, a second relay, and a second power adjustment module. The low-voltage interface is used to connect to the charging interface. The second power adjustment module is connected in series between the output module and the low-voltage interface. The second relay is connected in series between the second power adjustment module and the low-voltage interface. The first relay is connected in series between the first power adjustment module and the high-voltage interface. The first relay, the second relay, and the second power adjustment module are all electrically connected to the control module.

4. The vehicle low-voltage power supply system according to claim 3, characterized in that: The DC converter further includes: a first protection circuit and a second protection circuit, wherein the first protection circuit is connected in series between the first relay and the first power adjustment module, and the second protection circuit is connected in series between the second relay and the second power adjustment module.

5. The vehicle low-voltage power supply system according to claim 2, characterized in that: The first power adjustment module includes: a step-down module and a power module, the step-down module is electrically connected to the power module, the step-down module is used to reduce the voltage of the electric energy input from the high-voltage interface, and the power module is used to reduce the power of the electric energy input from the high-voltage interface.

6. The vehicle low-voltage power supply system according to claim 1, characterized in that: The vehicle low-voltage power compensation system also includes a power battery pack, which is connected to the high-voltage distribution box. The high-voltage distribution box is used to distribute the high-voltage electric energy provided by the power battery pack to the motor controller or the DC converter.

7. The vehicle low-voltage power supply system according to claim 6, characterized in that: The vehicle low-voltage power compensation system also includes: a vehicle controller, the low-voltage battery has a low-voltage battery management unit, the power battery pack has a high-voltage battery management unit, and the vehicle controller is electrically connected to the motor controller, the high-voltage distribution box, the low-voltage battery management unit, the high-voltage battery management unit and the DC converter respectively.

8. The vehicle low-voltage power supply system according to claim 1, characterized in that: The vehicle low-voltage power supplement system also includes: a charging interface, the charging interface is electrically connected to the high-voltage distribution box and / or the DC converter, the high-voltage distribution box is electrically connected to the power battery pack, the high-voltage distribution box is used to distribute the electric energy provided by the external power supply to the power battery pack, and / or the DC converter is used to adjust the electric energy provided by the external power supply and output it to the low-voltage battery.

9. The vehicle low-voltage power supply system according to claim 8, characterized in that: The charging interface includes: a high-voltage charging interface and a low-voltage charging interface. The high-voltage charging interface and the high-voltage distribution box are electrically connected via a high-voltage wiring harness, and the low-voltage charging interface and the DC converter are electrically connected via a low-voltage wiring harness.

10. A vehicle, characterized in that: include: A vehicle low-voltage power supplement system as claimed in any one of claims 1 to 9.

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