A new energy vehicle 12V lithium battery transportation factory mode management method

Abstract

The present invention discloses a management method for a factory mode of transportation of a 12V lithium battery for a new energy vehicle, comprising the following steps: S1, setting a transportation mode of a 12V lithium battery, turning off a MOS tube, and outputting no voltage at the positive and negative terminals of the 12V lithium battery, thereby ensuring that a short circuit problem caused by foreign matter does not occur during transportation; S2, setting a storage mode of a 12V lithium battery, and using a low-voltage communication hard-wire wake-up harness to short-circuit the negative terminal of the 12V lithium battery for wake-up, so that after the lithium battery is awakened, the battery terminal has a voltage output at 12V; S3, setting a factory mode of the lithium battery. The present invention solves the problem that the 12V lithium battery is improperly used due to immature technology or improper operation of assemblers during vehicle assembly, which easily leads to the closure of the MOS tube of the 12V lithium battery due to power loss or the scrapping of the lithium battery; corresponding management measures are taken for the 12V lithium battery in the links of parts out of storage, transportation, and final assembly, thereby avoiding the problem of power loss and safety hazards of the 12V lithium battery due to misoperation.

Description

Technical Field

[0001] The present invention belongs to the field of 12V lithium batteries for new energy vehicles, and more specifically, particularly relates to a transportation factory mode management method for 12V lithium batteries for new energy vehicles. Background Art

[0002] The application of 12V lithium batteries in new energy vehicles is mainly to provide a small amount of power when DCDC does not output the voltage required by the low voltage of the whole vehicle, so that each control module can work normally. After the whole vehicle is assembled, the electrical inspection and debugging are completed, and the vehicle is powered by the high-voltage process DCDC, the role of the 12V lithium battery is very small. Therefore, the specifications of 12V lithium batteries on the market are basically around 20Ah, and the SOC of lithium batteries shipped is generally required to be no higher than 70%.

[0003] If the 12V lithium battery is improperly used during vehicle assembly due to immature technology or improper operation by the assembler, it will easily cause the MOS tube of the 12V lithium battery to shut down or cause the lithium battery to be scrapped. In response to the above problems, the existing solution to the technical problem is to mainly rely on visual management and post safety warning operation slogans at important workstations. However, it cannot fundamentally solve the problem.

[0004] Therefore, it is necessary to take corresponding management measures for 12V lithium batteries in the process of parts delivery, transportation, and final assembly to avoid the problem of 12V lithium battery power loss and safety hazards caused by misoperation. Therefore, we propose a new energy vehicle 12V lithium battery transportation factory model management method. Summary of the invention

[0005] The purpose of the present invention is to solve the shortcomings existing in the prior art, and solve the problem that the 12V lithium battery is improperly used during the vehicle assembly process due to immature technology or improper operation of the assembler, which easily leads to the closure of the MOS tube of the 12V lithium battery or the scrapping of the lithium battery. Corresponding management measures are taken for the 12V lithium battery in the links of parts out of the warehouse, transportation, and final assembly, so as to avoid the problem of 12V lithium battery depletion and safety hazards caused by misoperation, and a new energy vehicle 12V lithium battery transportation factory model management method is proposed.

[0006] To achieve the above object, the present invention provides the following technical solution: a new energy vehicle 12V lithium battery transportation factory mode management method, comprising the following steps:

[0007] S1. Set the transportation mode of 12V lithium battery: Before shipping the 12V lithium battery, the battery supplier turns off the MOS tube, and there is no voltage output at the positive and negative terminals of the 12V lithium battery to ensure that there is no short circuit caused by foreign objects during transportation;

[0008] S2. Set the 12V lithium battery storage mode: Use the low-voltage communication hard-wire wake-up harness to short-circuit the negative electrode of the 12V lithium battery to wake up. After the lithium battery wakes up, the battery terminal outputs voltage at 12V to detect the status of the lithium battery;

[0009] S3, setting the factory mode of lithium battery: including the following steps:

[0010] Step 1. According to the vehicle assembly process, when the seat status is adjusted and the 12V lithium battery is enabled, a special tool with time setting is set at the seat station. The special tool sends a CAN signal command from the low-voltage communication of the 12V lithium battery to instruct the 12V lithium battery to close the MOS, discharge the vehicle and drive the seat to adjust the status. After the set end time, the BMS closes the MOS and ends the assembly process.

[0011] The second step is to confirm the power and time used for the workstations that need 12V lithium battery power supply in the final assembly process, and design special tooling for each workstation. The special tooling needs to be set with time and power calculation functions to ensure that the 12V lithium battery is used reasonably before high-voltage charging;

[0012] Step 3: After the vehicle electrical inspection is completed and you are ready to go to the voltage station, press the tailgate switch. The tailgate switch will send out a wake-up signal to the 12V lithium battery. When you arrive at the electrical inspection station, the BMS will record the number of times the 12V lithium battery is awakened and record the number of times. When the number of times is reached, the factory mode ends and the normal use mode of the 12V lithium battery is entered.

[0013] Preferably, in S2, the inspector wakes up the battery by short-circuiting the low-voltage communication hard-wire wake-up harness with the negative pole of the 12V lithium battery. The BMS receives a low-level signal, and after the 12V lithium battery wakes up, the MOS tube is closed. At this time, there is voltage output at the battery terminal, and the 12V lithium battery performs a normal status detection. The number of wake-up times is recorded as 1, and the first wake-up sets the wake-up MOS closing time to 2 minutes.

[0014] Preferably, during the 12V lithium battery status detection process, if the status detection time is less than 2 minutes, the detection personnel do not need to perform any further operations after the normal detection is completed. The MOS will automatically shut down the MOS after the agreed time of 2 minutes, and record the next step of the factory mode.

[0015] Preferably, in the first step of S3, the special tooling is equipped with a communication tool with a CAN module function, which is connected to the 12V lithium battery low-voltage communication and sends a CAN signal instruction 01, instructing the 12V lithium battery to close the MOS. When the BMS receives the CAN signal 01, it closes the MOS tube, and the 12V lithium battery terminal outputs a 12V voltage. The BMS records the mode stage. This mode sets the MOS tube closing time and the discharge capacity value of the 12V lithium battery. When the set time and capacity are reached, the MOS tube is disconnected and a CAN signal is sent to the special tooling to prompt that the process is completed. The special tooling uses an indicator light to remind and enters the next assembly station.

[0016] Preferably, in the second step of S3, all power, times and time are calculated for all assembly workstations that require 12V lithium batteries for power supply. If the power, times or time are exceeded, the tooling can no longer be used to wake up the 12V lithium battery, and the assembly workstation enters the electrical inspection workstation by default.

[0017] Preferably, in the third step of S3, the wake-up line of the 12V lithium battery is connected to the low voltage of the vehicle through the back door switch. After receiving the low-level wake-up signal, the BMS closes the MOS and sets the closing time to less than 5S. At this time, the VCU is required to complete the high-voltage process within 5S.

[0018] Preferably, in the third step of S3, after the low-voltage power supply is normal, the VCU enters the high-voltage process, and after the high-voltage is completed, it communicates and interacts normally with the BMS. After receiving the CAN signal of the VCU, the BMS enters the normal use mode and exits the factory mode; if the VCU fails to successfully increase the high voltage within 5S and does not perform normal CAN communication interaction, the BMS continues to enter the factory mode, turns off the MOS tube, and records the number of wake-up times and current information.

[0019] Preferably, the BMS includes a parameter acquisition module, a BMS battery management module, a main control module, a display module, an alarm module and a CAN module, wherein the main control module is respectively connected to the parameter acquisition module, the BMS battery management module, the alarm module and the CAN module in communication, the display module and the BMS battery management module are respectively connected to the CAN module in communication, and the alarm module is connected to the display module in communication;

[0020] The parameter acquisition module includes multiple temperature sensors, voltage sensors and current sensors. The temperature sensor is used to monitor and obtain the temperature information of the 12V lithium battery. The voltage sensor and current sensor are used to monitor and obtain the voltage and current information of the 12V lithium battery. The display module is used to display the 12V lithium battery information from the CAN module. The alarm module is used to issue an alarm message when the temperature of the 12V lithium battery is not within a preset threshold range and when a 12V lithium battery fails.

[0021] Preferably, when the low-voltage communication hard-wire wake-up harness is short-circuited with the negative pole of the 12V lithium battery for wake-up, the first end of the wake-up hard wire is connected to the 12V lithium battery, and the main control module is connected to the second end of the wake-up hard wire, and is used to send a wake-up signal through the wake-up hard wire when the 12V lithium battery is in a deep sleep state. The main control module is connected to the parameter acquisition module, and the parameter acquisition module is used to collect state parameters of the 12V lithium battery. The main control module is used to perform at least one of state estimation, charge and discharge management, heating management, balancing management and fault diagnosis on the 12V lithium battery according to the collected state parameters.

[0022] Preferably, the VCU is used to receive feedback information from each subsystem of the vehicle, send control instructions to each subsystem of the vehicle, and the VCU is used to manage the energy of the vehicle to improve energy utilization; when the SOC value of the 12V lithium battery is low, the vehicle controller will issue instructions to the electric accessories to limit the output power of the electric accessories.

[0023] Technical effects and advantages of the present invention: The present invention provides a new energy vehicle 12V lithium battery transportation factory model management method. Compared with the prior art, the present invention solves the problem of improper use of lithium batteries due to immature technology or improper operation of assemblers during vehicle assembly, which easily leads to the closure of the MOS tube of the 12V lithium battery or the scrapping of the lithium battery. Corresponding management measures are taken for the 12V lithium battery in the links of parts out of storage, transportation, and final assembly, avoiding the problem of 12V lithium battery depletion and safety hazards caused by misoperation. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a flow chart of the method of the present invention;

[0025] Figure 2 It is a flowchart of the present invention. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0027] See also Figure 1-2 The present invention provides a new energy vehicle 12V lithium battery transportation factory mode management method, comprising the following steps:

[0028] S1. Set the transportation mode of 12V lithium battery: Before shipping the 12V lithium battery, the battery supplier turns off the MOS tube, and there is no voltage output at the positive and negative terminals of the 12V lithium battery to ensure that there is no short circuit caused by foreign objects during transportation;

[0029] S2. Set the 12V lithium battery storage mode: Use the low-voltage communication hard-wire wake-up harness to short-circuit the negative electrode of the 12V lithium battery to wake up. After the lithium battery wakes up, the battery terminal outputs voltage at 12V to detect the status of the lithium battery;

[0030] S3, setting the factory mode of lithium battery: including the following steps:

[0031] Step 1. According to the vehicle assembly process, when the seat status is adjusted and the 12V lithium battery is enabled, a special tool with time setting is set at the seat station. The special tool sends a CAN signal command from the low-voltage communication of the 12V lithium battery to instruct the 12V lithium battery to close the MOS, discharge the vehicle and drive the seat to adjust the status. After the set end time, the BMS closes the MOS and ends the assembly process.

[0032] The second step is to confirm the power and time used for the workstations that need 12V lithium battery power supply in the final assembly process, and design special tooling for each workstation. The special tooling needs to be set with time and power calculation functions to ensure that the 12V lithium battery is used reasonably before high-voltage charging;

[0033] Step 3: After the vehicle electrical inspection is completed and you are ready to go to the voltage station, press the tailgate switch. The tailgate switch will send out a wake-up signal to the 12V lithium battery. When you arrive at the electrical inspection station, the BMS will record the number of times the 12V lithium battery is awakened and record the number of times. When the number of times is reached, the factory mode ends and the normal use mode of the 12V lithium battery is entered.

[0034] The main function of the 12V lithium battery system is to provide power to the low-voltage system when the high voltage on the vehicle is powered off, and it can provide emergency kinetic energy when the high voltage loses kinetic energy. SOC is the battery charge state.

[0035] In S2, the inspector uses the low-voltage communication hard-wire wake-up harness to short-circuit the negative pole of the 12V lithium battery to wake up. The BMS receives a low-level signal. After the 12V lithium battery wakes up, the MOS tube is closed. At this time, there is voltage output at the battery terminal. The 12V lithium battery performs normal status detection and records the number of wake-ups as 1. The first wake-up sets the wake-up MOS closing time to 2 minutes.

[0036] During the 12V lithium battery status detection process, if the status detection time is less than 2 minutes, the detection personnel do not need to perform any further operations after the normal detection is completed. The MOS will automatically shut down the MOS after the agreed time of 2 minutes, and record the next step of the factory mode.

[0037] In the first step of S3, the special tooling is equipped with a communication tool with CAN module function, which accesses the 12V lithium battery low-voltage communication and sends CAN signal instruction 01, instructing the 12V lithium battery to close the MOS. When the BMS receives the CAN signal 01, it closes the MOS tube, and the 12V lithium battery terminal outputs 12V voltage. In the BMS recording mode stage, this mode sets the MOS tube closing time and the discharge capacity value of the 12V lithium battery. When the set time and capacity are reached, the MOS tube is disconnected and a CAN signal is sent to the special tooling to prompt that the process is completed. The special tooling uses an indicator light to remind and enter the next assembly station.

[0038] The CAN module is an intelligent electronic control device that forwards communication data between the electronic control devices of the vehicle, so that the vehicle can realize a regional network control system for the on-board electronic control devices. The CAN module adopts a two-wire serial communication method, which has strong error detection capabilities, long communication distances, and strong anti-electromagnetic interference capabilities. In addition, the CAN module also has priority and arbitration functions. Multiple control units are connected through the CAN module, which reduces the use of low-voltage communication hard-wire wake-up harnesses and avoids the hidden dangers of mutual interference and wear of too many harnesses.

[0039] In the second step of S3, all power, times and time records are calculated for all workstations in the final assembly that require 12V lithium battery power supply. If the power, times or time used are exceeded, the tooling can no longer be used to wake up the 12V lithium battery, and the assembly station enters the electrical inspection station by default.

[0040] In the third step of S3, the wake-up line of the 12V lithium battery is connected to the low voltage of the vehicle through the back door switch. After receiving the low-level wake-up signal, the BMS closes the MOS and sets the closing time to less than 5S. At this time, the VCU needs to complete the high-voltage process within 5S.

[0041] In the third step of S3, after the low-voltage power supply is normal, the VCU enters the high-voltage process. After the high-voltage is completed, it communicates normally with the BMS. After receiving the CAN signal from the VCU, the BMS enters the normal usage mode and exits the factory mode. If the VCU fails to successfully increase the high voltage within 5S and does not perform normal CAN communication interaction, the BMS continues to enter the factory mode, turns off the MOS tube, and records the number of wake-up times and current information.

[0042] The BMS includes a parameter acquisition module, a BMS battery management module, a main control module, a display module, an alarm module and a CAN module. The main control module is respectively connected to the parameter acquisition module, the BMS battery management module, the alarm module and the CAN module in communication, the display module and the BMS battery management module are respectively connected to the CAN module in communication, and the alarm module is connected to the display module in communication;

[0043] The CAN module has reliable transmission, high real-time performance, long transmission distance (up to 10Km), fast transmission rate (up to 1MHzbps), can connect up to 110 nodes, and can easily expand the number of nodes. The CAN node with an error will automatically shut down and cut off the connection with the bus without affecting the communication of the bus; the message has a short frame structure and a hardware CRC check, with a low probability of interference and an extremely low data error rate; it can automatically detect whether the message is sent successfully or not, and can automatically resend it by hardware. The transmission reliability is very high; the hardware message filtering function only receives necessary information, reduces the CPU burden, and simplifies software compilation.

[0044] The BMS also includes an environment / MOSFET temperature acquisition module and a heating drive module. The environment / MOSFET temperature acquisition module is used to collect the temperature of the environment / MOSFET. The heating drive module is connected to the main control module and is used to start when the temperature of the environment / MOSFET is lower than a preset temperature threshold to heat the 12V lithium battery.

[0045] The parameter acquisition module includes multiple temperature sensors, voltage sensors and current sensors. The temperature sensor is used to monitor and obtain the temperature information of the 12V lithium battery. The voltage sensor and current sensor are used to monitor and obtain the voltage and current information of the 12V lithium battery. The display module is used to display the 12V lithium battery information from the CAN module. The alarm module is used to issue an alarm message when the temperature of the 12V lithium battery is not within a preset threshold range and when a 12V lithium battery fails.

[0046] When the low-voltage communication hard-wire wake-up harness is short-circuited with the negative pole of the 12V lithium battery for wake-up, the first end of the wake-up hard wire is connected to the 12V lithium battery, and the main control module is connected to the second end of the wake-up hard wire, and is used to send a wake-up signal through the wake-up hard wire when the 12V lithium battery is in a deep sleep state. The main control module is connected to the parameter acquisition module, and the parameter acquisition module is used to collect state parameters of the 12V lithium battery. The main control module is used to perform at least one of state estimation, charge and discharge management, heating management, balancing management and fault diagnosis on the 12V lithium battery according to the collected state parameters.

[0047] The main control module has a sleep wake-up function. When the 12V lithium battery is in a shallow sleep state, the 12V lithium battery is in a low power consumption state. In this state, the main control module can use software wake-up to wake up the 12V lithium battery in a shallow sleep state; and when the 12V lithium battery is in a deep sleep state, the 12V lithium battery is in an ultra-low power consumption state. In this state, in order to ensure that the 12V lithium battery can still be awakened and used, the 12V lithium battery needs to be awakened by hardware wake-up, that is, the main control module sends a wake-up signal through the wake-up hard line to wake up the 12V lithium battery in a deep sleep state. Therefore, through the above settings, it is possible to reduce the static power consumption during long-term placement, avoid the risk of battery over-discharge, extend the system's working time at low power, avoid damage caused by extreme situations such as abuse of 12V lithium batteries at low power, and ensure that the 12V lithium battery can still work at low power for emergency use.

[0048] The VCU is used to receive feedback from each subsystem of the vehicle and send control instructions to each subsystem of the vehicle. The VCU is also used to manage the energy of the vehicle to improve energy utilization. When the SOC value of the 12V lithium battery is low, the vehicle controller will issue instructions to the electric accessories to limit the output power of the electric accessories.

[0049] The VCU (vehicle controller) can detect the status of the vehicle in real time and send the information of each subsystem to the vehicle information display system. The process is to detect the vehicle status and the status information of each subsystem through sensors and CAN modules, drive the display instrument, and display the status information and fault diagnosis information through the display instrument. The display content includes: motor speed, vehicle speed, battery power, fault information, etc. The VCU (vehicle controller) controls the 12V lithium battery through the CAN module communication network to achieve effective management of the 12V lithium battery, and obtains the 12V lithium battery information through the BMS to provide a reference for the optimization control of the vehicle energy.

[0050] To summarize, when managing the 12V lithium battery transportation factory mode, first set the 12V lithium battery transportation mode, turn off the MOS tube, and there is no voltage output at the positive and negative terminals of the 12V lithium battery to ensure that there is no short circuit caused by foreign objects during transportation; then set the 12V lithium battery storage mode, use the low-voltage communication hard-line wake-up harness to short-circuit the negative terminal of the 12V lithium battery to wake up, and after the lithium battery wakes up, there is voltage output at the battery terminal at 12V to detect the status of the lithium battery; then set the lithium battery factory mode, set a special tooling with time setting at the seat station, and the special tooling sends a CAN signal command from the low-voltage communication of the 12V lithium battery to instruct the 12V lithium battery to close the MOS, and check the status of the whole vehicle. The discharge drive seat is used to adjust its status. After the set end time, the BMS turns off the MOS and ends the assembly process. For the workstations that require 12V lithium batteries for the final assembly process, the power and time required are confirmed, and special tooling is designed for each workstation. The special tooling needs to set time and power calculation functions to ensure that the 12V lithium battery is used reasonably before high-voltage charging. When the vehicle electrical inspection is completed and the voltage workstation is ready, press the back door switch, and the wake-up signal of the 12V lithium battery connected to the back door switch is sent out. When it arrives at the electrical inspection workstation, the BMS records the number of wake-up times of the 12V lithium battery and records the number of times. When the number is reached, the factory mode ends and enters the normal use mode of the 12V lithium battery.

[0051] The present invention solves the problem that the 12V lithium battery is improperly used during vehicle assembly due to immature technology or improper operation of assemblers, which easily leads to the 12V lithium battery running out of power and the MOS tube being shut down or the lithium battery being scrapped. Corresponding management measures are taken for the 12V lithium battery in the links of parts delivery, transportation, and final assembly, thereby avoiding the problem of 12V lithium battery running out of power and safety hazards caused by misoperation.

[0052] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A new energy vehicle 12V lithium battery transportation factory mode management method, characterized by: The steps include: S1. Set the transportation mode of 12V lithium battery: Before shipping the 12V lithium battery, the battery supplier turns off the MOS tube, and there is no voltage output at the positive and negative terminals of the 12V lithium battery to ensure that there is no short circuit caused by foreign objects during transportation; S2. Set the 12V lithium battery storage mode: Use the low-voltage communication hard-wire wake-up harness to short-circuit the negative electrode of the 12V lithium battery to wake up. After the lithium battery wakes up, the battery terminal outputs voltage at 12V to detect the status of the lithium battery; S3, setting the factory mode of lithium battery: including the following steps: Step 1. According to the vehicle assembly process, when the seat status is adjusted and the 12V lithium battery is enabled, a special tool with time setting is set at the seat station. The special tool sends a CAN signal command from the low-voltage communication of the 12V lithium battery to instruct the 12V lithium battery to close the MOS, discharge the vehicle and drive the seat to adjust the status. After the set end time, the BMS closes the MOS and ends the assembly process. The second step is to confirm the power and time used for the workstations that need 12V lithium battery power supply in the final assembly process, and design special tooling for each workstation. The special tooling needs to be set with time and power calculation functions to ensure that the 12V lithium battery is used reasonably before high-voltage charging; Step 3: After the vehicle electrical inspection is completed and you are ready to go to the voltage station, press the tailgate switch. The tailgate switch will send out a wake-up signal to the 12V lithium battery. When you arrive at the electrical inspection station, the BMS will record the number of times the 12V lithium battery is awakened and record the number of times. When the number of times is reached, the factory mode ends and the normal use mode of the 12V lithium battery is entered.

2. A new energy vehicle 12V lithium battery transportation factory mode management method according to claim 1, characterized in that: In S2, the inspector uses the low-voltage communication hard-wire wake-up harness to short-circuit the negative pole of the 12V lithium battery to wake up. The BMS receives a low-level signal. After the 12V lithium battery wakes up, the MOS tube is closed. At this time, there is voltage output at the battery terminal. The 12V lithium battery performs normal status detection and records the number of wake-ups as 1. The first wake-up sets the wake-up MOS closing time to 2 minutes.

3. A new energy vehicle 12V lithium battery transportation factory mode management method according to claim 2, characterized in that: During the 12V lithium battery status detection process, if the status detection time is less than 2 minutes, the detection personnel do not need to perform any further operations after the normal detection is completed. The MOS will automatically shut down the MOS after the agreed time of 2 minutes, and record the next step of the factory mode.

4. A new energy vehicle 12V lithium battery transportation factory mode management method according to claim 1, characterized in that: In the first step of S3, the special tooling is equipped with a communication tool with CAN module function, which accesses the 12V lithium battery low-voltage communication and sends CAN signal instruction 01, instructing the 12V lithium battery to close the MOS. When the BMS receives the CAN signal 01, it closes the MOS tube, and the 12V lithium battery terminal outputs 12V voltage. In the BMS recording mode stage, this mode sets the MOS tube closing time and the discharge capacity value of the 12V lithium battery. When the set time and capacity are reached, the MOS tube is disconnected and a CAN signal is sent to the special tooling to prompt that the process is completed. The special tooling uses an indicator light to remind and enter the next assembly station.

5. A new energy vehicle 12V lithium battery transportation factory mode management method according to claim 1, characterized in that: In the second step of S3, all power, times and time records are calculated for all workstations in the final assembly that require 12V lithium battery power supply. If the power, times or time used are exceeded, the tooling can no longer be used to wake up the 12V lithium battery, and the assembly station enters the electrical inspection station by default.

6. A new energy vehicle 12V lithium battery transportation factory mode management method according to claim 1, characterized in that: In the third step of S3, the wake-up line of the 12V lithium battery is connected to the low voltage of the vehicle through the back door switch. After receiving the low-level wake-up signal, the BMS closes the MOS and sets the closing time to less than 5S. At this time, the VCU needs to complete the high-voltage process within 5S.

7. A new energy vehicle 12V lithium battery transportation factory mode management method according to claim 6, characterized in that: In the third step of S3, after the low-voltage power supply is normal, the VCU enters the high-voltage process. After the high-voltage is completed, it communicates normally with the BMS. After receiving the CAN signal from the VCU, the BMS enters the normal usage mode and exits the factory mode. If the VCU fails to successfully increase the high voltage within 5S and does not perform normal CAN communication interaction, the BMS continues to enter the factory mode, turns off the MOS tube, and records the number of wake-up times and current information.

8. A new energy vehicle 12V lithium battery transportation factory mode management method according to claim 1, characterized in that: The BMS includes a parameter acquisition module, a BMS battery management module, a main control module, a display module, an alarm module and a CAN module. The main control module is respectively connected to the parameter acquisition module, the BMS battery management module, the alarm module and the CAN module in communication, the display module and the BMS battery management module are respectively connected to the CAN module in communication, and the alarm module is connected to the display module in communication; The parameter acquisition module includes multiple temperature sensors, voltage sensors and current sensors. The temperature sensor is used to monitor and obtain the temperature information of the 12V lithium battery. The voltage sensor and current sensor are used to monitor and obtain the voltage and current information of the 12V lithium battery. The display module is used to display the 12V lithium battery information from the CAN module. The alarm module is used to issue an alarm message when the temperature of the 12V lithium battery is not within a preset threshold range and when a 12V lithium battery fails.

9. A new energy vehicle 12V lithium battery transportation factory mode management method according to claim 8, characterized in that: When the low-voltage communication hard-wire wake-up harness is short-circuited with the negative pole of the 12V lithium battery for wake-up, the first end of the wake-up hard wire is connected to the 12V lithium battery, and the main control module is connected to the second end of the wake-up hard wire, and is used to send a wake-up signal through the wake-up hard wire when the 12V lithium battery is in a deep sleep state. The main control module is connected to the parameter acquisition module, and the parameter acquisition module is used to collect state parameters of the 12V lithium battery. The main control module is used to perform at least one of state estimation, charge and discharge management, heating management, balancing management and fault diagnosis on the 12V lithium battery according to the collected state parameters.

10. A new energy vehicle 12V lithium battery transportation factory mode management method according to claim 1, characterized in that: The VCU is used to receive feedback from each subsystem of the vehicle and send control instructions to each subsystem of the vehicle. The VCU is also used to manage the energy of the vehicle to improve energy utilization. When the SOC value of the 12V lithium battery is low, the vehicle controller will issue instructions to the electric accessories to limit the output power of the electric accessories.

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