Vehicle-mounted high-voltage battery pack charging and discharging power supply system and control method thereof

Abstract

The invention discloses a vehicle-mounted high-voltage battery pack charging and discharging power supply system and a control method thereof, and relates to the technical field of vehicle-mounted high-voltage energy storage, and the method comprises the steps: a system wakes up a request for low voltage, and obtains working parameters; monitoring the voltage value of the storage battery, part faults and CAN (Controller Area Network) communication; if the voltage of the storage battery is normal, the system works normally and parts do not have faults, low-voltage standby is prompted; the system normally requests high voltage or requests charging; monitoring high-voltage interlocking, fault conditions and bus voltage during pre-charging; when the high-voltage state of the system is normal and high voltage is normally increased, pure electric discharge is prompted; after high voltage is applied, the system normally requests direct current charging, alternating current charging or inversion discharging. The high-voltage battery pack is adopted to meet the high-voltage direct-current electricity utilization requirement of the system and the load requirement, various charging and discharging application scenes such as direct-current charging and alternating-current discharging and direct-current discharging and alternating-current discharging are supported, the discharging or charging mode is flexibly recognized, and double-gun charging and discharging can be effectively controlled according to the real-time working condition.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of vehicle-mounted high-voltage energy storage technology, and in particular to a vehicle-mounted high-voltage battery pack charging and discharging power supply system and a control method thereof. BACKGROUND

[0002] With the continuous development of artificial intelligence and mobile Internet of Things, the demand for mobile energy is becoming increasingly high. For example, when unmanned aerial vehicles, field construction equipment, small-scale farming machinery, and unmanned delivery vehicles are used in the field, power shortages often occur. To address this problem, a vehicle-mounted power supply can provide a temporary charging scenario for power-deficient equipment.

[0003] In the prior art, small generators and energy storage devices with small power are often used for outdoor power supply to meet the charging needs of digital products, so that the power supply can be effectively guaranteed when the above power supply is used outdoors. However, in outdoor applications, the situation is relatively complex, i.e., the daily power consumption is large. In addition to considering the power supply, the movement of the power supply and the daily power consumption also need to be considered. The generator set needs to be maintained and maintained. In addition, the power consumption time is long and the power consumption is large during outdoor activities. If only small generators and energy storage devices with small power are used, the actual use demand cannot be met.

[0004] Therefore, the present application provides a vehicle-mounted high-voltage battery pack charging and discharging power supply system and a control method thereof to eliminate the drawbacks of the prior art. SUMMARY

[0005] The present application aims to provide a vehicle-mounted high-voltage battery pack charging and discharging power supply system and a control method thereof to solve the problem that the existing outdoor power supply cannot meet the actual use demand.

[0006] To achieve the above-mentioned purpose, the present application provides the following technical solutions: A control method of a vehicle-mounted high-voltage battery pack charging and discharging power supply system, specifically comprising the following steps: Step S1, the charging and discharging power supply system wakes up and requests low voltage, and obtains the working parameters after the charging and discharging power supply system wakes up; Step S2, the charging and discharging power supply system monitors the battery voltage value, the fault condition of the charging and discharging power supply system components, and the CAN communication condition; Step S3, when the battery voltage is normal, the charging and discharging power supply system is working normally, and each system component is fault-free, the charging and discharging power supply system normally goes up to low voltage and prompts low-voltage standby. If not, the charging and discharging power supply system prompts the overvoltage, undervoltage, or system component fault state; Step S4, after the charging and discharging power supply system normally goes up to low voltage, the charging and discharging power supply system normally requests to go up to high voltage or requests to charge. Step S5, the charging and discharging power supply system monitors the high voltage interlock, the fault condition and state of the system components, and the bus voltage of each high voltage component during the pre-charging of the high voltage battery pack; Step S6, when the charging and discharging power supply system high voltage state is normal and the normal high voltage is met, the charging and discharging power supply system normally turns on the high voltage, and prompts the pure electric discharge, if not met, the charging and discharging power supply system prompts the high voltage component state detection error, the pre-charging detection failure or the charging and discharging power supply system failure state of prohibiting high voltage; Step S7, after the charging and discharging power supply system normally turns on the high voltage, the charging and discharging power supply system normally requests the direct current charging, the alternating current charging or the inverter discharging.

[0007] Preferably, the step S7 specifically comprises: When it is determined that the charging and discharging power supply system normally requests the alternating current charging, the charging and discharging power supply system normally charges the alternating current, and prompts the alternating current charging gun charging; When it is determined that the charging and discharging power supply system normally requests the inverter discharging, the charging and discharging power supply system normally starts the inverter, and prompts the inverter; When it is determined that the charging and discharging power supply system normally requests the direct current charging: Monitor the charging state and the current value of the high voltage battery pack parameters; If it is determined that the charging state of the high voltage battery pack parameters is charging and the high voltage battery pack current is negative, the charging and discharging power supply system normally charges the direct current, and prompts the direct current charging, if it is determined that the charging and discharging power supply system also normally requests the inverter discharging, the charging and discharging power supply system performs the direct current charging alternating current discharging, and prompts the double gun charging and discharging; If it is determined that the charging state of the high voltage battery pack parameters is charging and the high voltage battery pack current is positive, the charging and discharging power supply system normally discharges the direct current, and prompts the direct current discharging, if it is determined that the charging and discharging power supply system also normally requests the inverter discharging, the charging and discharging power supply system performs the direct current discharging alternating current discharging, and prompts the double gun charging and discharging.

[0008] Preferably, it further comprises: The charging and discharging power supply system requests to turn on the low voltage, and obtains the working parameters after the charging and discharging power supply system is woken up; Insert the direct current charging gun into the charging and discharging power supply system, and perform the direct current charging; If it is determined that the charging state of the high voltage battery pack parameters is normal, the high voltage battery pack is connected with the direct current charging gun, and there is no direct current charging failure, the charging and discharging power supply system normally requests the direct current charging; After the charging and discharging power supply system normally requests the direct current charging, if it is determined that the charging state of the high voltage battery pack parameters is charging, the high voltage battery pack current is negative, and the single cell voltage is greater than 3.63v, the charging and discharging power supply system cancels the direct current charging request. If the high-voltage battery pack parameter is determined to be in the charging state, the high-voltage battery pack current is negative, or the single-cell voltage is less than 3.63v, the charging and discharging power supply system still normally requests direct current charging after the normal request of the direct current charging of the charging and discharging power supply system.

[0009] Preferably, it further comprises: The charging and discharging power supply system wakes up to request low voltage, and obtains the working parameters after the charging and discharging power supply system wakes up. The two-in-one slow charging gun is inserted into the charging and discharging power supply system for alternating current charging. If the high-voltage battery pack parameter is determined to be in the charging state, the high-voltage battery pack current is negative, or the single-cell voltage is less than 3.63v, the charging and discharging power supply system still normally requests direct current charging after the normal request of the direct current charging of the charging and discharging power supply system.

[0010] Preferably, it further comprises: The charging and discharging power supply system wakes up to request low voltage, and obtains the working parameters after the charging and discharging power supply system wakes up. After the high voltage of the charging and discharging power supply system, the high voltage button on the man-machine interaction control screen is pressed to request high voltage. If the working parameters of the charging and discharging power supply system are determined to be in the state of no prohibition of high voltage, the charging and discharging power supply system normally requests high voltage.

[0011] Preferably, it further comprises: The charging and discharging power supply system wakes up to request low voltage, and obtains the working parameters after the charging and discharging power supply system wakes up. After the high voltage of the charging and discharging power supply system, the inverter button on the man-machine interaction control screen is pressed to request OBC inverter output. If the high-voltage battery pack parameter is determined to be in the charging state, the high-voltage battery pack current is negative, or the single-cell voltage is less than 3.63v, the charging and discharging power supply system still normally requests direct current charging after the normal request of the direct current charging of the charging and discharging power supply system.

[0012] Preferably, the wake-up mode of the charging and discharging power supply system in step S1 includes DC charging seat, plug-in power signal A+ of AC OBC controller, and low-voltage starting switch KL15 wake-up. The charging and discharging power supply system wakes up to satisfy: when the charging and discharging power supply system detects the plug-in power signal A+ wake-up or the low-voltage starting switch KL15 is activated, it is determined that the charging and discharging power supply system normally goes to low voltage, and prompts low-voltage standby, and when the charging and discharging power supply system detects the plug-in power signal A+ when the low-voltage starting switch KL15 is not activated, the charging and discharging power supply system enters the charging wake-up process.

[0013] The application discloses a vehicle-mounted high-voltage battery pack charging and discharging power supply system and a control method thereof. The high-voltage battery pack adopts a heat management mode combining self-cooling and film heat, is used for storing electric energy and meeting the high-voltage direct-current power demand of the charging and discharging power supply system and load demand. The two-in-one controller adopts a centralized design mode of OBC combining DCDC, is used for realizing AC charging gun charging, converting the direct-current power supply of the high-voltage battery pack into AC 220V and DC 12V output and outputting DC 12V to supply power to the storage battery, the two-in-one controller is electrically connected with the storage battery through a low-voltage power supply circuit, the two-in-one controller is electrically connected with the high-voltage battery pack through a high-voltage power supply circuit, and the two-in-one controller is internally provided with a water cooling channel for realizing a heat dissipation effect. The DC fast charging device comprises a DC charging and discharging interface and is used for realizing a DC charging gun charging function, the DC fast charging device is connected with the DC discharging device and is used for outputting a power supply meeting the load requirement. The AC slow charging device comprises an AC charging and discharging interface and is used for realizing an AC charging gun charging function or outputting a power supply converted by the two-in-one controller. The heat dissipation device adopts a centralized heat management mode of OBC combining DCDC and is used for dissipating heat of the two-in-one controller to enable the two-in-one controller to normally work at a suitable temperature, the heat dissipation device comprises a water pump and a radiator fan, the water pump forms a closed loop with the built-in water cooling channel of the two-in-one controller through a water conveying pipeline, and the radiator fan is fixed to one side of the shell of the two-in-one controller through a support. The system controller is used for receiving and processing working parameters and fault conditions of each component in the charging and discharging power supply system and controlling a charging and discharging process, and the wake-up hard-wire signal of the system controller comprises a plug-in gun power supply signal A+ and a low-voltage starting switch KL15. The man-machine interactive control screen is used for displaying working parameters and fault conditions in a visual form in cooperation with the system controller. The charging and discharging power supply system charges external power equipment through a discharging gun connected with a charging interface, and the external power equipment comprises a DC charging pile and an AC charging pile.

[0014] Preferably, the DC fast charging device is connected with and communicates with the DC charging pile through five low-voltage charging signal lines to realize signal interaction and state monitoring of a fast charging function, the five low-voltage charging signal lines are respectively marked as A+, A-, CC2, S+ and S-, the AC slow charging device is connected with and communicates with the AC charging pile through two low-voltage charging signal lines to realize signal interaction and state monitoring of a slow charging function, and the two low-voltage charging signal lines are respectively marked as CC and CP.

[0015] Preferably, the direct current charging alternating current discharging is that the direct current output by the direct current charging pile is charged to the high-voltage battery pack through the direct current fast charging device, the direct current output by the high-voltage battery pack is converted into 12V direct current and 220V alternating current through the two-in-one controller, and 12V direct current and 220V alternating current are supplied to the 12V direct current electrical equipment and the 220V alternating current electrical equipment. The direct current discharging alternating current discharging is that the direct current output by the direct current charging pile is discharged to the high-voltage battery pack through the direct current discharging device, so as to output a power source meeting the load requirement, the direct current output by the high-voltage battery pack is converted into 12V direct current and 220V alternating current through the two-in-one controller, and 12V direct current and 220V alternating current are supplied to the 12V direct current electrical equipment and the 220V alternating current electrical equipment.

[0016] Compared with the prior art, the application has the following beneficial effects: The vehicle-mounted high-voltage battery pack charging and discharging power supply system and the control method thereof adopt a high-voltage battery pack, can meet the daily power consumption of a user, can meet the high-voltage direct current power consumption demand of the charging and discharging power supply system and the load demand through the high-voltage battery pack, adopt an OBC combined with a DCDC mode for the two-in-one controller, reduce the cost and the weight, and can upload the working information and the fault information of the system and the components thereof through the interaction between the system controller and the man-machine interactive control screen, support various charging and discharging application scenarios, such as direct current charging alternating current discharging and direct current discharging alternating current discharging, can flexibly identify the direct current gun discharging or charging, can effectively and reasonably control the double-gun charging and discharging according to the system components and the real-time working conditions, improve the charging efficiency, and increase the adaptability of the system. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a step flow chart of the control method.

[0018] Figure 2 It is a step flow chart of step S7 of the control method.

[0019] Figure 3 It is a step flow chart of the normal request of the charging and discharging power supply system to direct current charging, alternating current charging and inverter discharging.

[0020] Figure 4 It is a structural schematic diagram of the charging and discharging power supply system.

[0021] Figure 5 It is an interactive schematic diagram of the charging and discharging power supply system and the storage battery.

[0022] Legend: high-voltage battery pack 100, two-in-one controller 200, direct current fast charging device 300, alternating current slow charging device 400, heat dissipation device 500, water pump 510, radiator fan 520, system controller 600, man-machine interactive control screen 700. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0024] Example 1

[0025] In this embodiment, as Figures 1-3 As shown, a control method for a vehicle-mounted high-voltage battery pack charging and discharging power supply system specifically includes the following steps: Step S1: The charging and discharging power supply system wakes up by requesting low voltage and obtaining the operating parameters of the charging and discharging power supply system after wake-up. Specifically, the wake-up methods include wake-up via DC charging dock, AC OBC controller plug power signal A+, and low-voltage start switch KL15. The charging and discharging power system wake-up condition is as follows: When the charging and discharging power system detects the plug-in power signal A+ wake-up or the low-voltage start switch KL15 is activated, it is determined that the charging and discharging power system is normally connected to low voltage and prompts low-voltage standby. When it is determined that the charging and discharging power system detects the plug-in power signal A+ when the low-voltage start switch KL15 is not activated, the charging and discharging power system enters the charging wake-up process. Step S2: Monitor the battery voltage value, fault status of the charging and discharging power system components, and CAN communication status of the charging and discharging power system. Step S3: When the battery voltage is normal, the charging and discharging power supply system is working normally and there are no faults in each system component, the charging and discharging power supply system normally applies low voltage and prompts low voltage standby. If the conditions are not met, the charging and discharging power supply system will prompt overvoltage, undervoltage or system component failure status. Specifically, steps S1 to S3 ensure that the charging and discharging power system is in a safe state before startup by using two wake-up methods (wake-up via plug-in power signal A+ and wake-up via low-voltage start switch KL15) and low-voltage detection indicators (battery voltage value, fault status of system components, and CAN communication status). For example, when the charging and discharging power system is woken up via plug-in power signal A+, if the battery voltage is detected to be lower than the normal range, it will immediately prompt "undervoltage status" and prohibit low-voltage input to avoid damage to low-voltage components due to undervoltage. In actual application, the battery voltage may drop due to low external environment. Step S2 detection can detect the problem in advance. Users can charge the battery with external devices before starting the charging and discharging power system to avoid startup failure or component damage. Step S4: After the charging and discharging power system normally applies low voltage, the charging and discharging power system normally requests high voltage or requests charging. Step S5: The charging and discharging power system monitors the high-voltage interlock, the fault status and condition of system components, and the bus voltage of each high-voltage component during the pre-charging of the high-voltage battery pack 100. Step S6, when the high-voltage state of the charge-discharge power supply system is normal and the normal high-voltage is turned on, the charge-discharge power supply system normally turns on the high-voltage, and prompts the pure electric discharge, if not, the charge-discharge power supply system prompts the high-voltage component state detection error, the pre-charge detection failure or the charge-discharge power supply system prohibition high-voltage fault state; Specifically, steps S4-S6 ensure the safe connection of the high-voltage loop by monitoring the high-voltage interlock, component state and bus voltage. For example, during pre-charge, if the charge-discharge power supply system detects that the bus voltage of the high-voltage component rises at a speed lower than the normal pre-charge speed, it prompts "pre-charge detection failure" and prohibits high-voltage, preventing equipment damage caused by high-voltage loop short circuit or component failure. In actual application, the output voltage of the high-voltage battery pack 100 reaches 330V, if there is a fault in the high-voltage loop such as a short circuit, directly turning on the high-voltage may cause a fire or component burnout. Step S5 pre-charge detection can effectively avoid such risks and ensure the safety of the charge-discharge power supply system and users; Step S7, after the charge-discharge power supply system normally turns on the high-voltage, the charge-discharge power supply system normally requests direct current charging, alternating current charging or inverter discharging; Specifically, step S7 realizes precise control through the positive and negative values of the high-voltage battery pack 100 current and the single cell voltage threshold. For example, when the charge-discharge power supply system requests direct current charging, if the high-voltage battery pack 100 current is negative and the single cell voltage is ≤3.63V, it normally charges, if the single cell voltage is >3.63V, it immediately cancels the charging to prevent overcharging. In actual application, different charging piles may have different output powers, step S7 can adjust the charging and discharging strategy according to the real-time state of the high-voltage battery pack 100 to avoid overcharging and overdischarging, while supporting double-gun charging and discharging to meet the power demand in complex scenarios; Specifically, the high-voltage interlock (HVIL) is a safety mechanism for the charge-discharge power supply system, which detects the connection integrity of the high-voltage loop such as whether the high-voltage plug is tightly inserted, ensures that the high-voltage component has no high-voltage output in the disconnected state, and ensures the safety of maintenance and operation. Its state is monitored in real time by the system controller 600. Inverter discharging is to convert the high-voltage direct current of the high-voltage battery pack 100 into alternating current 220V, which is output to external alternating current load through the discharge gun. It needs to meet the conditions of battery power >10%, no fault, etc. to start; As shown in Figure 2 Step S7 specifically includes three modes of direct current charging, alternating current charging or inverter discharging: AC charging mode: when it is determined that the charging and discharging power supply system normally requests AC charging, the charging and discharging power supply system normally charges in AC, and an AC charging gun is prompted to be charging. Before the charging and discharging power supply system requests AC charging, verification with the AC charging pile needs to be completed through 2 low-voltage signal lines (CC / CP) of the AC slow charging device 400. The CC line is used to detect whether the physical connection of the AC charging gun is in place, and the CP line is used to confirm whether the output voltage level of the AC charging pile is compatible with the charging and discharging power supply system; Inverter discharging mode: when it is determined that the charging and discharging power supply system normally requests inverter discharging, the charging and discharging power supply system normally starts the inverter, and inverter is prompted. Before the charging and discharging power supply system requests inverter discharging, it needs to detect whether the high-voltage battery pack 100 has more than 10% of the electric quantity and whether any single voltage is lower than the critical value of power loss. This can effectively avoid permanent damage to the battery caused by single over-discharge; DC charging mode: when it is determined that the charging and discharging power supply system normally requests DC charging: The charging state and current value of the high-voltage battery pack 100 parameters are monitored. The positive and negative values of the high-voltage battery pack 100 current are determined based on the system energy flow direction. If the current is negative, it indicates that energy flows from the external DC charging pile to the high-voltage battery pack 100, which is a charging state. If the current is positive, it indicates that energy flows from the high-voltage battery pack 100 to the external load, which is a discharging state. This determination needs to be combined with the real-time sampling data of the high-voltage battery pack 100 to reduce the probability of identification error; If it is determined that the charging state of the high-voltage battery pack 100 parameters is charging and the high-voltage battery pack 100 current is negative, the charging and discharging power supply system normally charges in DC, and DC charging is prompted. If it is determined that the charging and discharging power supply system also normally requests inverter discharging, the charging and discharging power supply system charges in DC and discharges in AC, and double-gun charging and discharging is prompted. If it is determined that the charging state of the high-voltage battery pack 100 parameters is charging and the high-voltage battery pack 100 current is positive, the charging and discharging power supply system normally discharges in DC, and DC discharging is prompted. If it is determined that the charging and discharging power supply system also normally requests inverter discharging, the charging and discharging power supply system discharges in DC and discharges in AC, and double-gun charging and discharging is prompted. Double-gun charging and discharging is that the charging and discharging power supply system simultaneously accesses two functionally different gun bodies such as a DC charging gun and an AC discharging gun, and cooperatively controls through the system controller 600 to realize energy input and output. The mode is as follows: DC charging AC discharging specifically refers to that the DC power output by the DC charging pile charges the high-voltage battery pack 100 through the DC fast charging device 300. The DC power output by the high-voltage battery pack 100 is converted into 12V DC and 220V AC by the two-in-one controller 200, and is used to supply power to 12V DC electrical equipment and 220V AC electrical equipment; The direct current discharge alternating current discharge is specifically: the direct current output by the direct current charging pile is discharged to the high-voltage battery pack 100 through a direct current discharge device, for outputting a power source meeting the load requirement, the direct current output by the high-voltage battery pack 100 is converted into 12V direct current and 220V alternating current by the two-in-one controller 200, and the 12V direct current and the 220V alternating current are used to supply power to 12V direct current electrical equipment and 220V alternating current electrical equipment; As shown in Figure 3 The control method further includes: The charging and discharging power supply system wakes up the low-voltage request, and obtains the working parameters after the charging and discharging power supply system wakes up; The direct current charging gun is inserted into the charging and discharging power supply system, and direct current charging is performed; If it is determined that the charging state of the high-voltage battery pack 100 parameter is normal, the high-voltage battery pack 100 is connected with the direct current charging gun and there is no direct current charging prohibition fault, the charging and discharging power supply system normally requests direct current charging; After the charging and discharging power supply system normally requests direct current charging, if it is determined that the charging state of the high-voltage battery pack 100 parameter is charging, the current of the high-voltage battery pack 100 is negative, and the single cell voltage is greater than 3.63v, the charging and discharging power supply system cancels the direct current charging request; After the charging and discharging power supply system normally requests direct current charging, if it is determined that the charging state of the high-voltage battery pack 100 parameter is charging, the current of the high-voltage battery pack 100 is negative, or the single cell voltage is less than 3.63v, the charging and discharging power supply system still normally requests direct current charging; Specifically, the control method realizes charging control by clearly defining the starting condition (normal charging state, no direct current charging prohibition fault) and cancellation mechanism of direct current charging. For example, in an outdoor direct current fast charging scene, when the single cell voltage of the high-voltage battery pack 100 reaches 3.63V, the charging and discharging power supply system automatically cancels the charging request to avoid overcharging. If the single cell voltage is lower than 3.63V and the current is negative, continue to charge to ensure that the high-voltage battery pack 100 is charged to a reasonable capacity. In actual application process, the output characteristics of direct current charging piles of different brands may be different. The control method can adapt to different charging piles, protect the battery pack, prolong the service life, and avoid the risk of battery bulging, fire, etc. caused by overcharging; As shown in Figure 3 The control method further includes: The low voltage is requested to be turned on, and the working parameters after the charging and discharging power supply system is woken up. In the AC slow charging scene, the plug-in power signal A+ of the AC OBC controller is preferentially used for waking up. When the two-in-one slow charging gun is inserted into the AC slow charging device 400, the plug-in action triggers the A+ signal. After the system controller 600 detects the signal, the low voltage is immediately requested to be turned on. If the A+ signal fails to wake up, the low voltage can be woken up by pressing the low voltage starting switch KL15, so as to ensure the reliability of the wake-up. The working parameters include but are not limited to the battery voltage, the CAN communication state, the initialization state of the AC OBC controller, the identification information of the two-in-one slow charging gun, and the like. The two-in-one slow charging gun is inserted into the charging and discharging power supply system to perform AC charging. The two-in-one slow charging gun is an interface device for AC slow charging, which is connected with an AC power supply and the AC slow charging device 400, and introduces AC power. The two-in-one controller 200 can be used to complete the charging of the high-voltage battery pack 100. If it is determined that the charging state of the high-voltage battery pack 100 parameter is normal, the high-voltage battery pack 100 is not connected with the DC charging gun, the high-voltage battery pack 100 is connected with the two-in-one slow charging gun and the electromagnetic lock is locked and there is no prohibition of AC charging fault, the charging and discharging power supply system normally requests AC charging. The electromagnetic lock is an electric lock at the AC slow charging interface, which is controlled by the two-in-one controller 200, and is a prior art. After being locked, the gun body can be prevented from falling off during the charging process. Specifically, the charging state needs to meet three sub-conditions at the same time: the battery management system (BMS) feedback of the high-voltage battery pack 100 is “no charging prohibition fault”, the current battery capacity is <95%, and the maximum difference of the battery single voltage is <0.1V. The detection operation that the high-voltage battery pack 100 is not connected with the DC charging gun can be determined by the CC2 signal line of the DC fast charging device 300. If the CC2 line detects that the resistance value is the standard DC charging gun connection resistance, it is determined that “the DC charging gun has been connected”, and the AC charging is prohibited. If the CC2 line detects that the resistance value is infinite, it is determined that “the DC charging gun is not connected”. The two-in-one slow charging gun connection verification can be detected by the CC signal line of the AC slow charging device 400. After the two-in-one slow charging gun is connected, the two-in-one controller 200 confirms whether the physical connection of the gun body is in place by collecting the resistance value. The electromagnetic lock locking verification can be determined by the electromagnetic lock output “locking holding signal”. The no prohibition of AC charging fault includes hardware faults and software faults. Examples of the hardware faults are the internal faults of the AC OBC controller, the faults of the heat dissipation device 500, and the like. Examples of the software faults are the CAN communication interruption, the charging parameter configuration error, and the like. As shown in FIG. 13, Figure 3 the control method further includes: The charging and discharging power supply system wakes up and requests high voltage, and obtains working parameters after the charging and discharging power supply system wakes up. The working parameters include, but are not limited to, battery voltage, system component fault, CAN communication state, high-voltage battery pack 100 pre-charge preparation parameter, two-in-one controller 200 state, and the like. After the charging and discharging power supply system is powered on, the high-voltage button on the human-computer interaction control screen 700 is pressed to request high voltage. The high-voltage button is a touch virtual button on the human-computer interaction control screen 700. If it is determined that the working parameters of the charging and discharging power supply system have no high-voltage prohibition fault state, the charging and discharging power supply system normally requests high voltage. The high-voltage prohibition fault state includes, but is not limited to, high-voltage interlocking fault, battery management system (BMS) fault, high-voltage component fault, pre-charge circuit fault, insulation monitoring fault, low-voltage power supply fault, and the like. All of them need to be checked for no abnormalities before the high voltage can be normally requested. As shown in Figure 3 The control method further includes: The charging and discharging power supply system wakes up and requests high voltage, and obtains working parameters after the charging and discharging power supply system wakes up. The working parameters include, but are not limited to, battery voltage, system component fault, CAN communication state, two-in-one controller 200 state, and the like. After the charging and discharging power supply system is powered on, the high-voltage button on the human-computer interaction control screen 700 is pressed to request high voltage. The high-voltage button is a touch virtual button on the human-computer interaction control screen 700. If it is determined that the high-voltage battery pack 100 parameter is greater than 10%, the high-voltage battery pack 100 and the two-in-one discharging gun are connected, and there is no prohibition inversion fault, the charging and discharging power supply system normally requests inversion discharge. Embodiment 2

[0026] As shown in Figure 4 and Figure 5 A vehicle-mounted high-voltage battery pack charging and discharging power supply system applied to the control method of the above vehicle-mounted high-voltage battery pack charging and discharging power supply system, comprising: The high-voltage battery pack 100 adopts a heat management mode combining self-cooling and film heating, is used for storing electric energy and meeting the high-voltage direct-current power demand of the charging and discharging power supply system and the load demand, and has a specification of 330V / 41.6kWh. The electric energy stored and output by the high-voltage battery pack 100 is high-voltage direct-current (DC) electric energy. For example, the direct-current electric energy output by a direct-current charging pile is input into the high-voltage battery pack 100 through a direct-current fast charging device 300, or the direct-current electric energy output by the high-voltage battery pack 100 is converted by the direct-current fast charging device 300 to supply power to an external load, that is, direct-current discharging. The high-voltage battery pack 100 is provided with a battery management system (BMS) and a temperature acquisition sensor. The self-cooling refers to that the high-voltage battery pack 100 internally adopts a high-thermal-conductivity heat-conducting adhesive to tightly adhere the battery cell to the shell, and utilizes the surface area of the shell for passive heat dissipation. When the temperature of the high-voltage battery pack 100 is in a normal working range, the natural cooling mode is relied on to maintain the temperature stable. The film heating refers to that in a low-temperature environment, a heating film preattached to the surface of the battery cell in the high-voltage battery pack 100 is started to uniformly heat the battery cell, so that the battery cell quickly reaches an optimal working temperature interval. The start and stop of the heating film and the power of the heating film are closed-loop controlled by the battery management system (BMS) according to the real-time acquisition of the battery cell temperature. Specifically, the high-voltage battery pack 100 is electrically connected with the two-in-one controller 200, is used for converting the high-voltage direct-current electric energy of the high-voltage battery pack 100 into alternating-current 220V or direct-current 12V, and can receive the converted high-voltage direct-current electric energy transmitted from the alternating-current slow charging device 400 through the two-in-one controller 200. The high-voltage battery pack 100 is electrically connected with the direct-current fast charging device 300, can directly receive the high-voltage direct-current electric energy introduced from the direct-current charging pile by the direct-current fast charging device 300, or output the high-voltage direct-current electric energy to the direct-current fast charging device 300. The high-voltage battery pack 100 is connected with the system controller 600 through a control line, feeds back the state through CAN communication, can upload real-time parameters such as voltage, current, electric quantity, single-cell voltage, charging state and fault condition, and receives the charging and discharging control instructions of the system controller 600. The two-in-one controller 200 adopts a centralized design mode of OBC combined with DCDC. The OBC is an alternating current OBC controller, and the DCDC is a direct current-direct current converter, which is used to realize the charging of the alternating current charging gun, convert the direct current power of the high-voltage battery pack 100 into alternating current 220V and direct current 12V output, and output the direct current 12V for the battery power supply. The two-in-one controller 200 is electrically connected to the battery through a low-voltage power supply circuit, and the two-in-one controller 200 is electrically connected to the high-voltage battery pack 100 through a high-voltage power supply circuit. The two-in-one controller 200 is internally provided with a water cooling channel for realizing the heat dissipation effect. The alternating current OBC controller is used to convert the external alternating current power (such as an alternating current charging pile and a household 220V power supply) into high-voltage direct current to charge the high-voltage battery pack 100. The DCDC (direct current-direct current converter) is used to convert the high-voltage direct current of the high-voltage battery pack 100 into low-voltage power to supply the vehicle-mounted battery, and simultaneously has an inverting function, which can convert the high-voltage direct current into alternating current 220V for external load use; Specifically, the input end of the two-in-one controller 200 is connected to the high-voltage battery pack 100 and the alternating current slow charging device 400. The output end of the two-in-one controller 200 outputs the converted high-voltage direct current to the high-voltage battery pack 100, outputs the direct current 12V to the low-voltage equipment, and outputs the inverted alternating current 220V to the external load. The two-in-one controller 200 is connected to the system controller 600 through a control circuit, used to upload the working state (such as OBC / DCDC temperature, conversion efficiency) and fault condition of the two-in-one controller 200, and receive control instructions. The two-in-one controller 200 is provided with a heat dissipation device 500 on one side, which can be triggered to start by cooperating with the system controller 600. The direct current fast charging device 300 includes a direct current charging and discharging interface, which is used to realize the direct current charging gun charging function. The direct current fast charging device 300 is connected to the direct current discharging device, which is used to output power meeting the load requirement. The direct current fast charging device 300 is connected to the direct current charging pile through a direct current charging seat, which is a physical interface component of the direct current fast charging device 300, used to be inserted into the direct current charging gun, provide a high-voltage power transmission channel, and realize signal interaction with the direct current charging pile through a low-voltage signal line. The direct current fast charging device 300 can receive the high-voltage direct current of the direct current charging pile during charging, and transmit the high-voltage direct current to the high-voltage battery pack 100. During discharging, the high-voltage direct current of the high-voltage battery pack 100 can be converted into direct current 48V or direct current 72V by the direct current discharging device to supply power to the external load. The direct current fast charging device 300 interacts with the direct current charging pile through five low-voltage charging signal lines (A+, A-, CC2, S+ and S-), and supports the plug-in power signal A+ wake-up mode. The AC slow charging device 400 includes an AC charging and discharging interface for realizing the charging function of the AC charging gun and outputting the power converted by the two-in-one controller 200. The AC slow charging device 400 can be connected to an external AC power source (such as an AC charging pile or a household 220V power source) to transmit AC power to the AC OBC controller of the two-in-one controller 200, and after conversion, charge the high-voltage battery pack 100. The AC slow charging device 400 interacts with the AC charging pile through two low-voltage charging signal lines (CC and CP) to confirm the connection state and the locking state of the electromagnetic lock. The heat dissipation device 500 adopts a centralized heat management mode of OBC combined with DCDC, and is used for dissipating heat of the two-in-one controller 200 to make it work normally at a suitable temperature. The heat dissipation device 500 includes a water pump 510 and a radiator fan 520. The water pump 510 forms a closed loop with the built-in water cooling channel of the two-in-one controller 200 through a water conveying pipeline. The cooling liquid in the pipeline circulates under the driving of the water pump 510 to continuously take away the heat generated by the two-in-one controller 200 during operation, thereby transferring the heat. The radiator fan 520 is fixed near the shell of the two-in-one controller 200 through a support. After the radiator fan 520 is started, air flow is generated to accelerate the air flow on the surface of the shell, so that the heat transferred by the water pump 510 is quickly dissipated to the surrounding environment, thereby improving the overall heat dissipation efficiency. The radiator fan 520 is fixed on one side of the shell of the two-in-one controller 200 through a support. The control signal end of the water pump 510 and the radiator fan 520 is connected to the corresponding pin of the system controller 600 through a wire harness. The system controller 600 can dynamically control the start-stop and rotating speed of the water pump 510 according to the real-time temperature of the two-in-one controller 200 (collected by a temperature sensor and uploaded to the system controller 600 through CAN communication). The power supply end of the water pump 510 and the radiator fan 520 is connected to the charging and discharging power supply system and is powered by 12V low-voltage power converted by the DCDC (direct current-dc converter) of the two-in-one controller 200, so as to ensure that it obtains stable working power. The system controller 600 is used for receiving and processing the working parameters and fault conditions of the components in the charging and discharging power supply system, and controlling the charging and discharging process. The wake-up hard-wire signal of the system controller 600 includes the plug-in power signal A+ and the low-voltage start switch KL15. The system controller 600 does not participate in the transmission of high-voltage power, but only coordinates the components through the control circuit. The system controller 600 can be abbreviated as VCU. The low-voltage start switch KL15 is a manual start switch of the low-voltage circuit. The human-computer interaction control screen 700 is used for displaying the working parameters and fault conditions in a visual form in cooperation with the system controller 600. The human-computer interaction control screen 700 is connected to the system controller 600 through the control circuit, receives user operations such as starting the inverter discharging and confirming the charging and discharging instructions, and transmits the instructions to the system controller 600. The charge-discharge power supply system is connected with the charging interface through the discharging gun to charge the external power equipment, and the external power equipment includes a direct current charging pile and an alternating current charging pile. The DC fast charging device 300 is connected and communicated with the DC charging pile through 5 low-voltage charging signal lines to realize signal interaction and state monitoring of the fast charging function, and the 5 low-voltage charging signal lines are respectively marked as A+, A-, CC2, S+ and S-. In summary, the application provides a vehicle-mounted high-voltage battery pack charge-discharge power supply system and a control method thereof, which realizes safe and multi-mode vehicle-mounted charge-discharge functions through the cooperative work of the high-voltage battery pack 100, the two-in-one controller 200, the DC fast charging device 300, the AC slow charging device 400, the heat dissipation device 500, the system controller 600 and the man-machine interactive control screen 700.

[0027] The above is only a specific embodiment of the application, but the protection scope of the application is not limited thereto, and any person skilled in the art can easily think of changes or replacements within the technical range disclosed in the application, which should be covered within the protection scope of the application. Therefore, the protection scope of the application should be subject to the protection scope of the claims.

Claims

1. A control method of a vehicle-mounted high-voltage battery pack charge-discharge power supply system, characterized by, Specifically comprising the following steps: Step S1, the charging and discharging power supply system wakes up and requests to turn on low voltage, and obtains the working parameters after the charging and discharging power supply system wakes up; Step S2, the charging and discharging power supply system monitors the battery voltage value, the fault condition of the charging and discharging power supply system components and the CAN communication condition; Step S3, when the battery voltage is normal, the charging and discharging power supply system is in normal working condition and each system component is in normal working condition, the charging and discharging power supply system is in normal low voltage, and the low voltage standby is prompted, if not, the charging and discharging power supply system prompts the overvoltage, the undervoltage or the system component fault state; Step S4, after the charging and discharging power supply system is in normal low voltage, the charging and discharging power supply system normally requests to turn on high voltage or requests to charge; Step S5, the charging and discharging power supply system monitors the high voltage interlock, the fault condition and state of the system components and the bus voltage of each high voltage component during the pre-charging of the high voltage battery pack (100); Step S6, when the charging and discharging power supply system is in normal high voltage state and normally turns on high voltage, the charging and discharging power supply system normally turns on high voltage, and the pure electric discharge is prompted, if not, the charging and discharging power supply system prompts the high voltage component state detection error, the pre-charging detection failure or the charging and discharging power supply system inhibition high voltage fault state; Step S7, after the charging and discharging power supply system is in normal high voltage, the charging and discharging power supply system normally requests direct current charging, alternating current charging or inverter discharging.

2. The control method of a high-voltage battery pack charging and discharging power supply system for a vehicle according to claim 1, characterized by, The step S7 specifically comprises: When it is determined that the charging and discharging power supply system normally requests alternating current charging, the charging and discharging power supply system normally charges in alternating current, and the alternating current charging gun charging is prompted; When it is determined that the charging and discharging power supply system normally requests inverter discharging, the charging and discharging power supply system normally starts the inverter, and the inverter is prompted; When it is determined that the charging and discharging power supply system normally requests direct current charging: The charging state and the current value of the high voltage battery pack (100) parameters are monitored; If it is determined that the charging state of the high voltage battery pack (100) parameters is in charging and the current of the high voltage battery pack (100) is negative, the charging and discharging power supply system normally charges in direct current, and the direct current charging is prompted, if it is determined that the charging and discharging power supply system also normally requests inverter discharging, the charging and discharging power supply system charges in direct current and discharges in alternating current, and the double gun charging and discharging is prompted; If it is determined that the charging state of the high voltage battery pack (100) parameters is in charging and the current of the high voltage battery pack (100) is positive, the charging and discharging power supply system normally discharges in direct current, and the direct current discharging is prompted, if it is determined that the charging and discharging power supply system also normally requests inverter discharging, the charging and discharging power supply system discharges in direct current and discharges in alternating current, and the double gun charging and discharging is prompted.

3. The control method of the vehicle-mounted high-voltage battery pack charging and discharging power supply system according to claim 1, characterized in that, Further comprising: The charging and discharging power supply system wakes up and requests to turn on low voltage, and obtains the working parameters after the charging and discharging power supply system wakes up; The direct current charging gun is inserted into the charging and discharging power supply system, and the direct current charging is performed; If it is determined that the charging state of the high voltage battery pack (100) parameters is normal, the high voltage battery pack (100) is connected with the direct current charging gun and there is no inhibition direct current charging fault, the charging and discharging power supply system normally requests direct current charging; If the charging state of the high-voltage battery pack (100) parameters is determined to be in charging, the current of the high-voltage battery pack (100) is negative, and the single cell voltage is greater than 3.63v, the charge-discharge power supply system cancels the direct current charging request after normally requesting direct current charging; If the charging state of the high-voltage battery pack (100) parameters is determined to be in charging, the current of the high-voltage battery pack (100) is negative, or the single cell voltage is less than 3.63v, the charge-discharge power supply system still normally requests direct current charging after normally requesting direct current charging.

4. The control method of a high-voltage battery pack charging and discharging power supply system for a vehicle according to claim 1, characterized by, Further comprising: The charge-discharge power supply system wakes up to request low voltage, and obtains the working parameters after the charge-discharge power supply system wakes up; Insert the two-in-one slow charging gun into the charge-discharge power supply system to perform alternating current charging; If it is determined that the charging state of the high-voltage battery pack (100) parameters is normal, the high-voltage battery pack (100) is not connected with the direct current charging gun, the high-voltage battery pack (100) is connected with the two-in-one slow charging gun and the electromagnetic lock is locked, and there is no prohibition of alternating current charging fault, the charge-discharge power supply system normally requests alternating current charging.

5. The control method of a high-voltage battery pack charging and discharging power supply system for a vehicle according to claim 1, characterized by, Further comprising: The charge-discharge power supply system wakes up to request low voltage, and obtains the working parameters after the charge-discharge power supply system wakes up; After the charge-discharge power supply system is high-voltage, the high-voltage button on the man-machine interaction control screen (700) is pressed to request high-voltage; If it is determined that the working parameters of the charge-discharge power supply system have no high-voltage prohibition fault state, the charge-discharge power supply system normally requests high-voltage.

6. The control method of a high-voltage battery pack charging and discharging power supply system for a vehicle according to claim 1, characterized by, Further comprising: The charge-discharge power supply system wakes up to request low voltage, and obtains the working parameters after the charge-discharge power supply system wakes up; After the charge-discharge power supply system is high-voltage, the inverter button on the man-machine interaction control screen (700) is pressed to perform OBC inverter output; If it is determined that the high-voltage battery pack (100) parameters are greater than 10%, the high-voltage battery pack (100) is connected with the two-in-one discharge gun, and there is no prohibition of inverter fault, the charge-discharge power supply system normally requests inverter discharge.

7. The control method of a high-voltage battery pack charging and discharging power supply system for a vehicle according to claim 1, characterized by, The wake-up mode of the charge-discharge power supply system in step S1 includes a direct current charging seat, an alternating current OBC controller plug-in gun power signal A+ wake-up, and a low-voltage starting switch KL15 wake-up; The charge-discharge power supply system wakes up to satisfy: when the charge-discharge power supply system detects the plug-in gun power signal A+ wake-up or the low-voltage starting switch KL15 is activated, it is determined that the charge-discharge power supply system is normally high-voltage, and low-voltage standby is prompted, and when it is determined that the charge-discharge power supply system detects the plug-in gun power signal A+ when the low-voltage starting switch KL15 is not activated, the charge-discharge power supply system enters the charging wake-up process.

8. A control method of the vehicle-mounted high-voltage battery pack charging and discharging power supply system according to any one of claims 1 to 7, characterized in that, Comprising: The high-voltage battery pack (100) adopts a heat management mode of self-cooling and membrane heat combination, and is used for storing electric energy and meeting the high-voltage direct current power demand of the charge-discharge power supply system and load demand; The two-in-one controller (200) adopts a centralized design mode of OBC combined with DCDC, is used for realizing AC charging gun charging, converting DC power supply of a high-voltage battery pack (100) into AC 220V and DC 12V output, and outputting DC 12V for battery power supply, the two-in-one controller (200) is electrically connected with the battery through a low-voltage power supply circuit, the two-in-one controller (200) is electrically connected with the high-voltage battery pack (100) through a high-voltage power supply circuit, and the two-in-one controller (200) is internally provided with a water cooling channel for realizing a heat dissipation effect; The DC fast charging device (300) includes a DC charging and discharging interface, is used for realizing a DC charging gun charging function, and is connected with a DC discharging device to output power supply meeting load requirements; The AC slow charging device (400) includes an AC charging and discharging interface, is used for realizing an AC charging gun charging function, or outputting power supply converted by the two-in-one controller (200); The heat dissipation device (500) adopts a centralized heat management mode of OBC combined with DCDC, is used for performing heat dissipation operation on the two-in-one controller (200) to make it normally work at a suitable temperature, the heat dissipation device (500) includes a water pump (510) and a radiator fan (520), the water pump (510) forms a closed loop with the built-in water cooling channel of the two-in-one controller (200) through a water delivery pipeline, and the radiator fan (520) is fixed on one side of a shell of the two-in-one controller (200) through a support; The system controller (600) is used for receiving and processing working parameters and fault conditions of components in a charging and discharging power supply system, and controlling a charging and discharging process, and a wake-up hard-wire signal of the system controller (600) includes a gun power supply signal A+ and a low-voltage starting switch KL15; The man-machine interactive control screen (700) is used for displaying working parameters and fault conditions in a visual form in cooperation with the system controller (600); The charging and discharging power supply system charges external power equipment through a discharging gun connected with a charging interface, and the external power equipment includes a DC charging pile and an AC charging pile.

9. The high-voltage battery pack charging and discharging power supply system for vehicle according to claim 8, characterized in that, The DC fast charging device (300) is connected with and communicates with the DC charging pile through five low-voltage charging signal lines to realize signal interaction and state monitoring of a fast charging function, the five low-voltage charging signal lines are respectively marked as A+, A-, CC2, S+ and S-, the AC slow charging device (400) is connected with and communicates with the AC charging pile through two low-voltage charging signal lines to realize signal interaction and state monitoring of a slow charging function, and the two low-voltage charging signal lines are respectively marked as CC and CP.

10. The high-voltage battery pack charging and discharging power supply system for vehicle according to claim 8, characterized in that, The direct current charging alternating current discharging is specifically: direct current output by the direct current charging pile is charged to the high-voltage battery pack (100) through a direct current fast charging device (300), direct current output by the high-voltage battery pack (100) is converted into 12V direct current and 220V alternating current through a two-in-one controller (200), and 12V direct current and 220V alternating current are used to supply power to 12V direct current electrical equipment and alternating current 220V electrical equipment. The direct current discharging alternating current discharging is specifically: direct current output by the direct current charging pile is discharged to the high-voltage battery pack (100) through a direct current discharging device, for outputting power meeting load requirements, direct current output by the high-voltage battery pack (100) is converted into 12V direct current and 220V alternating current through the two-in-one controller (200), and 12V direct current and 220V alternating current are used to supply power to 12V direct current electrical equipment and alternating current 220V electrical equipment.

Images