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

Abstract

The application discloses a kind of vehicle-mounted high-voltage battery pack charging and discharging power supply system and control method thereof, it is related to vehicle-mounted high-voltage energy storage technical field, the method comprises: system wake-up request upper low voltage, obtain working parameter;Monitoring battery voltage value and component failure and CAN communication;Satisfy battery voltage normal, system normal work and component are without failure and then prompt low-voltage standby;System normal request upper high voltage or request charging;Monitoring high-voltage interlock, fault condition and bus voltage during pre-charging;System high-voltage state normal and normal upper high voltage then prompt pure electric discharge;After upper high voltage, system normal request direct current charging, alternating current charging or inverter discharge.The application adopts high-voltage battery pack to meet the high-voltage direct current power demand of system and load demand, supports multiple charging and discharging application scenarios, such as direct current charging alternating current discharge, direct current discharge alternating current discharge and the like, flexibly identifies discharge or charging mode, can effectively control double-gun charging and discharging according to 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 temporary charging scenarios for power-deficient devices.

[0003] In the prior art, small generators and energy storage devices with small power are often used for outdoor power supplies to meet the charging needs of digital products, so that the power supply can be effectively guaranteed when the above-mentioned 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:

[0007] A control method of a vehicle-mounted high-voltage battery pack charging and discharging power supply system, specifically comprising the following steps:

[0008] 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;

[0009] 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;

[0010] 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 to low voltage and prompts low-voltage standby. If not, the charging and discharging power supply system prompts the overvoltage, under-voltage, or system component fault state.

[0011] Step S4, after the charging and discharging power supply system is normally connected to the low voltage, the charging and discharging power supply system normally requests to be connected to the high voltage or requests to be charged;

[0012] 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;

[0013] Step S6, when the charging and discharging power supply system is in a normal high voltage state and is normally connected to the high voltage, the charging and discharging power supply system is normally connected to the high voltage and prompts pure electric discharge, and if not, the charging and discharging power supply system prompts a high voltage component state detection error, a pre-charging detection failure, or a charging and discharging power supply system failure state that prohibits the connection to the high voltage;

[0014] Step S7, after the charging and discharging power supply system is normally connected to the high voltage, the charging and discharging power supply system normally requests direct current charging, alternating current charging, or inverter discharging;

[0015] When it is determined that the charging and discharging power supply system normally requests direct current charging:

[0016] The charging state and current value of the high voltage battery pack parameter are monitored;

[0017] If it is determined that the charging state of the high voltage battery pack parameter is charging and the high voltage battery pack current is negative, the charging and discharging power supply system normally charges with direct current and prompts that the direct current is charging, and 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 with direct current and discharges with alternating current and prompts dual-gun charging and discharging;

[0018] If it is determined that the charging state of the high voltage battery pack parameter is charging and the high voltage battery pack current is positive, the charging and discharging power supply system normally discharges with direct current and prompts that the direct current is discharging, and 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 with direct current and discharges with alternating current and prompts dual-gun charging and discharging.

[0019] Preferably, the step S7 specifically includes:

[0020] 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 with alternating current and prompts that the alternating current charging gun is charging;

[0021] 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 prompts that the inverter is working.

[0022] Preferably, it further includes:

[0023] The charging and discharging power supply system wakes up and requests to be connected to the low voltage, and obtains the working parameters after the charging and discharging power supply system wakes up;

[0024] The DC charging gun is inserted into the charge-discharge power supply system to perform DC charging;

[0025] If it is determined that the charging state of the high-voltage battery pack parameter is normal, the high-voltage battery pack is connected with the DC charging gun, and there is no fault of prohibiting DC charging, the charge-discharge power supply system normally requests DC charging;

[0026] After the charge-discharge power supply system normally requests DC charging, if it is determined that the charging state of the high-voltage battery pack parameter is charging, the high-voltage battery pack current is negative, and the single cell voltage is greater than 3.63v, the charge-discharge power supply system cancels the DC charging request;

[0027] After the charge-discharge power supply system normally requests DC charging, if it is determined that the charging state of the high-voltage battery pack parameter is charging, the high-voltage battery pack current is negative, and the single cell voltage is greater than 3.63v, the charge-discharge power supply system cancels the DC charging request;

[0028] Preferably, it further comprises:

[0029] 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;

[0030] The two-in-one slow charging gun is inserted into the charge-discharge power supply system to perform AC charging;

[0031] If it is determined that the charging state of the high-voltage battery pack parameter is normal, the high-voltage battery pack is not connected with the DC charging gun, the high-voltage battery pack is connected with the two-in-one slow charging gun, and the electromagnetic lock is locked and there is no fault of prohibiting AC charging, the charge-discharge power supply system normally requests AC charging.

[0032] Preferably, it further comprises:

[0033] 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;

[0034] After the charge-discharge power supply system is high-voltage, the high-voltage button on the human-computer interaction control screen is pressed to request high-voltage;

[0035] If it is determined that the working parameters of the charge-discharge power supply system have no fault state of prohibiting high-voltage, the charge-discharge power supply system normally requests high-voltage.

[0036] Preferably, it further comprises:

[0037] 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;

[0038] After the charge-discharge power supply system is high-voltage, the inverter button on the human-computer interaction control screen is pressed to perform OBC inverter output;

[0039] If it is determined that the high-voltage battery pack parameter is greater than 10%, the high-voltage battery pack and the two-in-one discharge gun are connected, and there is no prohibition of inverter failure, the charging and discharging power supply system normal request inverter discharge.

[0040] Preferably, the wake-up mode of the charging and discharging power supply system in step S1 includes DC charging seat, AC OBC controller plug-in gun power signal A+ wake-up and low-voltage starting switch KL15 wake-up.

[0041] The charging and discharging power supply system satisfies: when the charging and discharging power supply system detects plug-in gun power signal A+ wake-up or low-voltage starting switch KL15 activation, it is determined that the charging and discharging power supply system is normal to low voltage, and low-voltage standby is prompted, and when it is determined that the charging and discharging power supply system detects plug-in gun power signal A+ when low-voltage starting switch KL15 is not activated, the charging and discharging power supply system enters the charging wake-up process.

[0042] A vehicle-mounted high-voltage battery pack charging and discharging power supply system applied to a control method of a vehicle-mounted high-voltage battery pack charging and discharging power supply system, comprising:

[0043] The high-voltage battery pack adopts a heat management mode combining self-cooling with film heat, and is used for storing electrical energy and meeting the high-voltage direct-current power demand of the charging and discharging power supply system and load demand;

[0044] The two-in-one controller adopts a centralized design mode of OBC combined with DCDC, and is used for realizing AC charging gun charging, converting high-voltage battery pack direct-current power into AC 220V and DC 12V output, and outputting DC 12V for battery power supply. The two-in-one controller is electrically connected with the battery through a low-voltage power supply line, and is electrically connected with the high-voltage battery pack through a high-voltage power supply line. The two-in-one controller is internally provided with a water cooling channel for realizing heat dissipation effect.

[0045] The DC fast charging device includes a DC charging and discharging interface, and is used for realizing DC charging gun charging function. The DC fast charging device is connected with the DC discharging device, and is used for outputting power meeting load requirements.

[0046] The AC slow charging device includes an AC charging and discharging interface, and is used for realizing AC charging gun charging function or outputting power converted by the two-in-one controller.

[0047] The heat dissipation device adopts a centralized heat management mode of OBC combined with DCDC, and is used for heat dissipation operation of the two-in-one controller, so that it normally works at a suitable temperature. The heat dissipation device includes 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. The radiator fan is fixed on one side of the shell of the two-in-one controller through a support.

[0048] A system controller 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, wherein the wake-up hard-wire signal of the system controller comprises a plug-in power signal A+ and a low-voltage starting switch KL15;

[0049] A human-computer interaction control screen for displaying the working parameters and fault conditions in a visual form in cooperation with the system controller;

[0050] The charging and discharging power supply system is connected to the charging interface of the external power-consuming equipment through the discharging gun, and the external power supply equipment comprises a direct-current charging pile and an alternating-current charging pile.

[0051] Preferably, the direct-current fast charging device is connected to and communicates with the direct-current charging pile through five low-voltage charging signal lines to realize signal interaction and state monitoring of the fast charging function, the five low-voltage charging signal lines are respectively denoted as A+, A-, CC2, S+ and S-, the alternating-current slow charging device is connected to and communicates with the alternating-current charging pile through two low-voltage charging signal lines to realize signal interaction and state monitoring of the slow charging function, and the two low-voltage charging signal lines are respectively denoted as CC and CP.

[0052] Preferably, the direct-current charging and alternating-current discharging specifically refers to that the direct-current power 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 power output by the high-voltage battery pack is converted into 12V direct-current power and 220V alternating-current power through the two-in-one controller, and the 12V direct-current power and the 220V alternating-current power are used to supply power to 12V direct-current power-consuming equipment and 220V alternating-current power-consuming equipment.

[0053] The direct-current charging and alternating-current discharging specifically refers to that the direct-current power output by the direct-current charging pile is discharged to the high-voltage battery pack through the direct-current discharging device, and is used to output power meeting the load requirement, the direct-current power output by the high-voltage battery pack is converted into 12V direct-current power and 220V alternating-current power through the two-in-one controller, and the 12V direct-current power and the 220V alternating-current power are used to supply power to 12V direct-current power-consuming equipment and 220V alternating-current power-consuming equipment.

[0054] Compared with the prior art, the present application has the following beneficial effects:

[0055] This vehicle-mounted high-voltage battery pack charging and discharging power system and its control method utilize a high-voltage battery pack, capable of meeting the user's daily power consumption. Simultaneously, the high-voltage battery pack can meet the high-voltage DC power requirements of the charging and discharging power system and load. The two-in-one controller employs an OBC combined with a DC-DC converter, reducing cost and weight. The system controller interacts with a human-machine interface control panel, allowing the uploading of system and component operating information and fault information. It supports various charging and discharging application scenarios, such as DC charging and AC discharging, and DC discharging and AC discharging. It also flexibly identifies DC gun discharge or charging, effectively and rationally controlling dual-gun charging and discharging based on system components and real-time operating conditions, improving charging efficiency and increasing the system's adaptability. Attached Figure Description

[0056] Figure 1 This is a flowchart illustrating the overall steps of the control method of the present invention.

[0057] Figure 2 This is a flowchart of step S7 of the control method of the present invention.

[0058] Figure 3 The flowchart illustrates the steps of the charging and discharging power supply system of the present invention for normally requesting DC charging, AC charging, and inverter discharging.

[0059] Figure 4 This is a schematic diagram of the charging and discharging power supply system of the present invention.

[0060] Figure 5 This is a schematic diagram illustrating the interaction between the charging and discharging power supply system and the battery of the present invention.

[0061] Figure reference numerals: High-voltage battery pack 100, two-in-one controller 200, DC fast charging device 300, AC slow charging device 400, heat dissipation device 500, water pump 510, radiator fan 520, system controller 600, human-machine interaction control screen 700. Detailed Implementation

[0062] 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.

[0063] Example 1

[0064] 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:

[0065] 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.

[0066] Specifically, the wake-up mode 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.

[0067] The charging and discharging power supply system wake-up satisfies: when the charging and discharging power supply system detects the plug-in gun power signal A+ wake-up or the low-voltage starting switch KL15 activation, it is determined that the charging and discharging power supply system is normally started at low voltage, and low-voltage standby is prompted, and when it is determined that the charging and discharging power supply system detects the plug-in gun 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;

[0068] Step S2, the charging and discharging power supply system monitors the battery voltage value, and the fault condition and CAN communication condition of the charging and discharging power supply system components;

[0069] Step S3, when the battery voltage is normal, the charging and discharging power supply system is normally started at low voltage, and low-voltage standby is prompted, and if not, the charging and discharging power supply system prompts the overvoltage, undervoltage or system component fault state;

[0070] Specifically, steps S1-S3 through two wake-up modes (plug-in gun power signal A+ wake-up, low-voltage starting switch KL15 wake-up) and low-voltage detection indicators (battery voltage value, system component fault condition and CAN communication condition) ensure that the charging and discharging power supply system is in a safe state before starting, for example: when the charging and discharging power supply system is woken up by the plug-in gun power signal A+, if it is detected that the battery voltage is lower than the normal range, the "undervoltage state" is immediately prompted and the low-voltage starting is prohibited to avoid damage to the low-voltage components due to undervoltage. In actual application process, the battery may be caused by the external environment to be too low to cause the voltage to drop, and step S2 detects the problem in advance. The user can start the charging and discharging power supply system by supplementing the battery power through external equipment to avoid starting failure or component damage of the charging and discharging power supply system;

[0071] Step S4, after the charging and discharging power supply system is normally started at low voltage, the charging and discharging power supply system normally requests to start at high voltage or requests to charge;

[0072] 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;

[0073] Step S6, when the charging and discharging power supply system high-voltage state is normal and normally started at high voltage, the charging and discharging power supply system is normally started at high voltage, and pure electric discharge is prompted, and 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;

[0074] 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-charging, if the charge-discharge power supply system detects that the high-voltage component bus voltage rises at a speed lower than the normal pre-charging speed, it prompts "pre-charging detection failure" and prohibits high-voltage connection, preventing equipment damage caused by high-voltage loop short circuits or component failures. In actual applications, if the high-voltage battery pack 100 output voltage reaches 330V and there is a fault in the high-voltage loop such as a line short circuit, directly connecting high voltage may cause a fire or component burnout. Step S5 pre-charging detection can effectively avoid such risks and ensure the safety of the charge-discharge power supply system and users.

[0075] Step S7: After the charge-discharge power supply system is normally connected to high voltage, the charge-discharge power supply system normally requests direct current charging, alternating current charging, or inverter discharging.

[0076] Specifically, step S7 achieves 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, normal charging is performed. If the single cell voltage is >3.63V, charging is immediately canceled to prevent overcharging. In actual applications, 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.

[0077] Specifically, the high-voltage interlock (HVIL) is a safety mechanism for the charge-discharge power supply system. It detects the connection integrity of the high-voltage loop, such as whether the high-voltage plug is tightly inserted, to ensure that the high-voltage components have no high-voltage output in the disconnected state, ensuring maintenance and operation safety. Its state is monitored in real time by the system controller 600. Inverter discharging is the conversion of high-voltage direct current from the high-voltage battery pack 100 to alternating current 220V, which is output to external alternating current loads through the discharge gun. It requires conditions such as battery capacity >10% and no faults to start.

[0078] As shown in Figure 2 Step S7 specifically includes three modes: direct current charging, alternating current charging, or inverter discharging.

[0079] Alternating current charging mode: when it is determined that the charge-discharge power supply system normally requests alternating current charging, the charge-discharge power supply system normally charges in alternating current, and prompts that the alternating current charging gun is charging. Before the charge-discharge power supply system requests alternating current charging, verification with the alternating current charging pile is completed through the 2 low-voltage signal lines (CC / CP) of the alternating current slow charging device 400. The CC line is used to detect whether the physical connection of the alternating current charging gun is in place, and the CP line is used to confirm whether the alternating current charging pile output voltage level is compatible with the charge-discharge power supply system.

[0080] Inversion discharge mode: when it is determined that the normal charging and discharging power supply system requests inversion discharge, the normal charging and discharging power supply system opens the inversion, and prompts that the inversion is in progress. Before the normal charging and discharging power supply system requests inversion discharge, it is necessary to detect whether the high-voltage battery pack 100 has more than 10% of the electric quantity and whether any single cell voltage is lower than the critical value of loss of electricity, which can effectively avoid permanent damage to the battery caused by over-discharge of the single cell;

[0081] Direct current charging mode: when it is determined that the normal charging and discharging power supply system requests direct current charging,

[0082] The charging state and current value of the high-voltage battery pack 100 parameter are monitored. The positive and negative values of the high-voltage battery pack 100 current are determined based on the energy flow direction of the system. If the current is negative, it indicates that the energy flows from the external direct current charging pile to the high-voltage battery pack 100, which is the charging state. If the current is positive, it indicates that the energy flows from the high-voltage battery pack 100 to the external load, which is the 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;

[0083] If it is determined that the charging state of the high-voltage battery pack 100 parameter is in charging and the current of the high-voltage battery pack 100 is negative, the normal direct current charging of the charging and discharging power supply system is carried out, and the direct current charging is prompted. If it is determined that the normal charging and discharging power supply system also requests inversion discharge, the charging and discharging power supply system carries out direct current charging and alternating current discharging, and prompts the double-gun charging and discharging;

[0084] If it is determined that the charging state of the high-voltage battery pack 100 parameter is in charging and the current of the high-voltage battery pack 100 is positive, the normal direct current discharging of the charging and discharging power supply system is carried out, and the direct current discharging is prompted. If it is determined that the normal charging and discharging power supply system also requests inversion discharge, the charging and discharging power supply system carries out direct current discharging and alternating current discharging, and prompts the double-gun charging and discharging. The double-gun charging and discharging is that the charging and discharging power supply system simultaneously accesses two functionally different guns such as a direct current charging gun and an alternating current discharging gun, and is cooperatively controlled by the system controller 600 to realize the input and output of energy. The mode is as follows:

[0085] The direct current charging and alternating current discharging is as follows: the direct current output by the direct current charging pile charges the high-voltage battery pack 100 through the direct current fast charging device 300. 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 is used to supply power to 12V direct current electrical equipment and 220V alternating current electrical equipment;

[0086] The direct current discharging and alternating current discharging is as follows: the direct current output by the direct current charging pile discharges the high-voltage battery pack 100 through the direct current discharging device, which is used to output a power source that meets the load requirements. 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 is used to supply power to 12V direct current electrical equipment and 220V alternating current electrical equipment.

[0087] As shown in Figure 3 The control method further comprises:

[0088] The low-voltage wake-up request of the charge-discharge power supply system is obtained, and the working parameters after the charge-discharge power supply system wakes up are obtained.

[0089] The DC charging gun is inserted into the charge-discharge power supply system, and DC charging is performed.

[0090] 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 DC charging gun and there is no DC charging prohibition fault, the charge-discharge power supply system normally requests DC charging.

[0091] After the charge-discharge power supply system normally requests DC 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 charge-discharge power supply system cancels the DC charging request.

[0092] After the charge-discharge power supply system normally requests DC 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 charge-discharge power supply system still normally requests DC charging.

[0093] Specifically, the control method realizes charging control by clearly defining the starting condition (normal charging state, no DC charging prohibition fault) and cancellation mechanism of DC charging. For example, in an outdoor DC fast charging scene, when the single cell voltage of the high-voltage battery pack 100 reaches 3.63V, the charge-discharge 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, the charging continues to ensure that the high-voltage battery pack 100 is charged to a reasonable capacity. In actual application process, the output characteristics of different brands of DC charging piles 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.

[0094] As shown in Figure 3 The control method further comprises:

[0095] The charging and discharging power supply system is woken up by a low voltage, and working parameters after the charging and discharging power supply system is woken up are obtained. In an alternating current slow charging scene, an A+ wake-up mode of a plug-in power signal of an alternating current OBC controller is preferentially used. When the two-in-one slow charging charging gun is inserted into the alternating current 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. If the A+ signal wake-up fails, the wake-up can be performed by pressing the low-voltage starting switch KL15 to ensure the wake-up reliability. The working parameters include but are not limited to a storage battery voltage, a CAN communication state, an alternating current OBC controller initialization state, two-in-one slow charging charging gun identification information and the like.

[0096] The two-in-one slow charging charging gun is inserted into the charging and discharging power supply system to perform alternating current charging. The two-in-one slow charging charging gun is an interface device of the alternating current slow charging. The two-in-one slow charging charging gun is connected with the alternating current power supply and the alternating current slow charging device 400, and the alternating current power is introduced. The charging of the high-voltage battery pack 100 can be completed by cooperating with the two-in-one controller 200.

[0097] 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 direct current charging gun, the high-voltage battery pack 100 is connected with the two-in-one slow charging charging gun and the electromagnetic lock is locked and there is no prohibition of alternating current charging fault, the charging and discharging power supply system normally requests the alternating current charging. The electromagnetic lock is an electric lock at the alternating current slow charging interface and is controlled by the two-in-one controller 200. The electromagnetic lock is a prior art. After the electromagnetic lock is locked, the gun body can be prevented from falling off during the charging process.

[0098] Specifically, the charging state needs to meet three sub-conditions at the same time. The three sub-conditions are that the battery management system (BMS) built in the high-voltage battery pack 100 feeds back “no charging prohibition fault”, the current battery capacity is <95%, and the maximum difference of the battery single body voltage is <0.1V. The detection operation that the high-voltage battery pack 100 is not connected with the direct current charging gun can be determined by the CC2 signal line of the direct current fast charging device 300. If the CC2 line detects that the resistance value is the standard direct current charging gun connection resistance, it is determined that “the direct current charging gun is connected”. The alternating current charging is prohibited. If the CC2 line detects that the resistance value is infinite, that is, there is no gun connection. The “direct current charging gun is not connected” is met. The two-in-one slow charging charging gun connection verification can be detected by the CC signal line of the alternating current 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 alternating current charging fault includes hardware faults and software faults. The hardware fault examples are the internal fault of the alternating current OBC controller, the fault of the heat dissipation device 500 and the like. The software fault examples are the CAN communication interruption, the charging parameter configuration error and the like.

[0099] As shown in FIG. 1, Figure 3 the control method further includes:

[0100] 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 including but 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, etc.

[0101] 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, and the high-voltage button is a touch virtual button on the human-computer interaction control screen 700.

[0102] 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, and 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, etc., and all abnormal conditions need to be checked before normal high-voltage request can be made.

[0103] As shown in Figure 3 , the control method further includes:

[0104] 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 including but not limited to battery voltage, system component fault, CAN communication state, two-in-one controller 200 state, etc.

[0105] 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, and the high-voltage button is a touch virtual button on the human-computer interaction control screen 700.

[0106] 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 of inverter fault, the charging and discharging power supply system normally requests inverter discharge.

[0107] Embodiment 2

[0108] 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:

[0109] The high-voltage battery pack 100 adopts a heat management mode of self-cooling combined with 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), for example, direct-current (DC) 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 direct-current (DC) 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) temperature acquisition sensor. The self-cooling refers to that a high-thermal-conductivity heat-conducting adhesive is used to tightly adhere the battery cell to the shell in the high-voltage battery pack 100, passive heat dissipation is performed by using the surface area of the shell, 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 and power of the heating film are closed-loop controlled by the battery management system (BMS) according to the real-time acquired battery cell temperature.

[0110] 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 of the high-voltage battery pack 100 into alternating current 220V or direct current 12V, and can receive the converted high-voltage direct-current from the two-in-one controller 200 transmitted from the alternating-current slow charging device 400. 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 introduced from the direct-current charging pile by the direct-current fast charging device 300, or output the high-voltage direct-current 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.

[0111] 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 line, and the two-in-one controller 200 is electrically connected to the high-voltage battery pack 100 through a high-voltage power supply line. 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 direct current to supply power to the vehicle-mounted battery. At the same time, the DCDC has an inverter function, which can convert the high-voltage direct current into alternating current 220V for external load use.

[0112] 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 device, 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 line, 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 the system controller 600.

[0113] 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.

[0114] 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 electromagnetic lock state.

[0115] 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 delivery 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 bracket. 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 bracket. 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 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.

[0116] The system controller 600 is used for receiving and processing the working parameters and fault conditions of each component 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 for the low-voltage circuit.

[0117] The human-computer interaction control screen 700 is used for cooperating with the system controller 600 to display work parameters and fault conditions in a visual form, and the human-computer interaction control screen 700 is connected with the system controller 600 through a control line, receives user operations such as starting reverse discharge and confirming charging and discharging instructions, and transmits the instructions to the system controller 600.

[0118] The charging and discharging power supply system is connected with the charging interface through the discharge gun to charge external power equipment, and the external power equipment includes a direct-current charging pile and an alternating-current charging pile.

[0119] The direct-current fast charging device 300 is connected with and communicates with the direct-current charging pile through five low-voltage charging signal lines to realize signal interaction and state monitoring of the fast charging function, the five low-voltage charging signal lines are respectively marked as A+, A-, CC2, S+ and S-, the alternating-current slow charging device 400 is connected with and communicates with the alternating-current charging pile through two low-voltage charging signal lines to realize signal interaction and state monitoring of the slow charging function, the two low-voltage charging signal lines are respectively marked as CC and CP, the A+ line is a positive line of the plug-in gun power signal, the A- line is a negative line of the plug-in gun power signal, the CC2 line is a direct-current charging connection confirmation line, the S+ line is a positive line of the direct-current fast charging communication, the S- line is a negative line of the direct-current fast charging communication, the CC line is an alternating-current charging connection confirmation line, and the CP line is an alternating-current charging control guide line.

[0120] In summary, the application provides a vehicle-mounted high-voltage battery pack charging and discharging power supply system and a control method thereof, and through the cooperative work of the high-voltage battery pack 100, the two-in-one controller 200, the direct-current fast charging device 300, the alternating-current slow charging device 400, the heat dissipation device 500, the system controller 600 and the human-computer interaction control screen 700, the safe and multi-mode vehicle-mounted charging and discharging function is realized, the charging and discharging power supply system supports direct-current charging, alternating-current charging, reverse discharge and double-gun cooperative charging and discharging, has safety mechanisms such as high-voltage interlocking and pre-charging detection, is suitable for various scenes such as outdoor operation, and significantly improves the adaptability, safety and use efficiency of outdoor power supply.

[0121] The above merely describes a specific implementation of the application, but the protection scope of the application is not limited to this, 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 in 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 for a vehicle-mounted high-voltage battery pack charging and discharging power supply system, characterized in that, Specifically, the following steps are included: Step S1: The charging and discharging power system wakes up by requesting a low voltage and obtains the operating parameters of the charging and discharging power system after it is woken up. 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 prompts overvoltage, undervoltage or system component failure status. 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 precharging of the high voltage battery pack (100). Step S6: When the charging and discharging power system is in a normal high-voltage state and is normally connected to the high voltage, the charging and discharging power system is normally connected to the high voltage and prompts pure electric discharge. If the condition is not met, the charging and discharging power system prompts a high-voltage component status detection error, pre-charge detection failure, or a charging and discharging power system prohibiting high voltage connection fault state. Step S7: After the charging and discharging power system is normally connected to high voltage, the charging and discharging power system normally requests DC charging, AC charging or inverter discharging. When it is determined that the charging / discharging power supply system is normally requesting DC charging: Monitor the charging status and current value of the high-voltage battery pack (100); If the charging status of the high voltage battery pack (100) is determined to be charging and the current of the high voltage battery pack (100) is negative, the charging and discharging power supply system performs normal DC charging and prompts that DC charging is in progress. If the charging and discharging power supply system also requests normal inverter discharge at the same time, the charging and discharging power supply system performs DC charging and AC discharging and prompts that dual-gun charging and discharging is in progress. If the charging status of the high-voltage battery pack (100) is determined to be charging and the current of the high-voltage battery pack (100) is positive, the charging and discharging power supply system will perform normal DC discharge and indicate that it is performing DC discharge. If the charging and discharging power supply system also requests normal inverter discharge at the same time, the charging and discharging power supply system will perform DC discharge and AC discharge and indicate that it is performing dual-gun charging and discharging.

2. The control method for a vehicle-mounted high-voltage battery pack charging and discharging power supply system according to claim 1, characterized in that, Step S7 specifically includes: When it is determined that the charging and discharging power system is normally requesting AC charging, the charging and discharging power system is normally charging AC and indicates that the AC charging gun is charging. When it is determined that the charging and discharging power system is normally requesting inverter discharge, the charging and discharging power system normally starts the inverter and indicates that the inverter is in progress.

3. The control method for a vehicle-mounted high-voltage battery pack charging and discharging power supply system according to claim 1, characterized in that, Also includes: The charging and discharging power system wake-up request is low voltage, and the operating parameters of the charging and discharging power system after wake-up are obtained. Insert the DC charging gun into the charging and discharging power system to perform DC charging; If it is determined that the charging status of the high-voltage battery pack (100) is normal and there is no fault prohibiting DC charging when the high-voltage battery pack (100) is connected to the DC charging gun, the charging and discharging power system normally requests DC charging. After the charging and discharging power system normally requests DC charging, if it is determined that the charging status of the high-voltage battery pack (100) parameters is charging, the current of the high-voltage battery pack (100) is negative and the individual cell voltage is greater than 3.63V, the charging and discharging power system cancels the DC charging request. After the charging and discharging power system normally requests DC charging, if it is determined that the charging status of the high-voltage battery pack (100) is charging, and 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 system will still normally request DC charging.

4. The control method for a vehicle-mounted high-voltage battery pack charging and discharging power supply system according to claim 1, characterized in that, Also includes: The charging and discharging power system wake-up request is low voltage, and the operating parameters of the charging and discharging power system after wake-up are obtained. Insert the 2-in-1 slow charger into the charging and discharging power system for AC charging; If it is determined that the charging status of the high-voltage battery pack (100) is normal, the high-voltage battery pack (100) is not connected to the DC charging gun, the high-voltage battery pack (100) is connected to the two-in-one slow charging gun and the electromagnetic lock is locked without any AC charging prohibition fault, the charging and discharging power system normally requests AC charging.

5. The control method for a vehicle-mounted high-voltage battery pack charging and discharging power supply system according to claim 1, characterized in that, Also includes: The charging and discharging power system wake-up request is low voltage, and the operating parameters of the charging and discharging power system after wake-up are obtained. After the charging and discharging power supply system is powered by high voltage, press the high voltage button on the human-machine interface control panel (700) to request the high voltage to be applied; If it is determined that the operating parameters of the charging and discharging power supply system do not have a fault state that prohibits high voltage access, the charging and discharging power supply system shall normally request high voltage access.

6. The control method for a vehicle-mounted high-voltage battery pack charging and discharging power supply system according to claim 1, characterized in that, Also includes: The charging and discharging power system wake-up request is low voltage, and the operating parameters of the charging and discharging power system after wake-up are obtained. After the charging and discharging power supply system is powered by high voltage, press the inverter button on the human-machine interface control panel (700) to perform OBC inverter output; If it is determined that the high-voltage battery pack (100) parameters are that the charge is greater than 10%, the high-voltage battery pack (100) and the two-in-one discharge gun are connected and there is no inverting fault, the charging and discharging power system normally requests inverting discharge.

7. The control method for a vehicle-mounted high-voltage battery pack charging and discharging power supply system according to claim 1, characterized in that, The wake-up methods of the charging and discharging power system in step S1 include wake-up via DC charging dock, AC OBC controller plug-in power signal A+, and low-voltage start switch KL15. The wake-up of the charging and discharging power system 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 determines 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.

8. A vehicle-mounted high-voltage battery pack charging and discharging power supply system, applied to the control method of the vehicle-mounted high-voltage battery pack charging and discharging power supply system according to any one of claims 1-7, characterized in that, include: The high-voltage battery pack (100) adopts a thermal management method that combines self-cooling and membrane heating to store electrical energy and meet the high-voltage DC power requirements of the charging and discharging power system and load. The two-in-one controller (200) adopts a centralized design method combining OBC and DCDC to realize AC charging gun charging, inverting the DC power of the high-voltage battery pack (100) to AC 220V and DC 12V output, and outputting DC 12V to replenish the battery. The two-in-one controller (200) is electrically connected to the battery through a low-voltage power supply line and electrically connected to the high-voltage battery pack (100) through a high-voltage power supply line. The two-in-one controller (200) is equipped with a water-cooling channel inside to achieve heat dissipation. A DC fast charging device (300) includes a DC charging and discharging interface for realizing the charging function of a DC charging gun. The DC fast charging device (300) is connected to a DC discharging device for outputting power that meets the load requirements. An AC slow charging device (400) includes an AC charging and discharging interface for realizing the AC charging gun charging function, or outputting power after conversion by a two-in-one controller (200). The heat dissipation device (500) adopts a centralized thermal management method combining OBC and DC-DC to dissipate heat from the two-in-one controller (200) so that it can 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 supply pipeline. The radiator fan (520) is fixed to one side of the housing of the two-in-one controller (200) by a bracket. The system controller (600) is used to receive and process the working parameters and fault conditions of each component in the charging and discharging power supply system, and to control the charging and discharging process. The wake-up hard-wired signal of the system controller (600) includes the plug-in power signal A+ and the low-voltage start switch KL15. The human-machine interface control screen (700) is used in conjunction with the system controller (600) to display working parameters and fault conditions in a visual form; The charging and discharging power system charges external electrical equipment through a discharge gun connected to a charging interface. The external power supply equipment includes DC charging piles and AC charging piles.

9. A vehicle-mounted high-voltage battery pack charging and discharging power supply system according to claim 8, characterized in that, The DC fast charging device (300) is connected and communicates with the DC charging pile through 5 low-voltage charging signal lines to realize signal interaction and status monitoring of the fast charging function. The 5 low-voltage charging signal lines are respectively denoted as A+, A-, CC2, S+ and S-. The AC slow charging device (400) is connected and communicates with the AC charging pile through 2 low-voltage charging signal lines to realize signal interaction and status monitoring of the slow charging function. The 2 low-voltage charging signal lines are respectively denoted as CC and CP.

10. A vehicle-mounted high-voltage battery pack charging and discharging power supply system according to claim 8, characterized in that, The DC charging and AC discharging are specifically as follows: the DC power output by the DC charging pile charges the high-voltage battery pack (100) through the DC fast charging device (300), and the DC power output by the high-voltage battery pack (100) is converted into 12V DC power and 220V AC power by the two-in-one controller (200), and supplies power to 12V DC power and 220V AC power. The DC discharge and AC discharge are specifically as follows: the DC power output by the DC charging pile is discharged to the high-voltage battery pack (100) through the DC discharge device to output power that meets the load requirements. The DC power output by the high-voltage battery pack (100) is converted into 12V DC power and 220V AC power by the two-in-one controller (200) and supplies power to 12V DC power and 220V AC power.

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