Lithium battery under-voltage repair method, system, and vehicle

Abstract

The application provides a lithium battery under-voltage repair method, system and vehicle, and relates to the technical field of new energy automobile batteries.The method comprises the following steps: detecting the state of a lithium battery control module by using a vehicle control module; when the state information of the lithium battery control module is detected, controlling corresponding units by the vehicle control module to make the vehicle enter a high-voltage process; a DCDC direct-current conversion module outputs voltage according to the state information of the lithium battery control module; when the lithium battery control module detects that the external voltage is greater than the internal voltage and the pressure difference between the external voltage and the internal voltage satisfies a first threshold value, a MOS tube in a lithium battery low-voltage system is closed, the lithium battery low-voltage system enters a normal charging process, and under-voltage repair is completed, so that the technical problems that it is difficult to restart the vehicle after under-voltage and the efficiency is low in the prior art are solved, and the technical effect of improving the convenience of vehicle under-voltage restart is achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of new energy automobile battery, in particular to a lithium battery under-voltage repair method, system and vehicle. BACKGROUND

[0002] With the rapid development of new energy automobile technologies such as pure electric vehicles and hybrid electric vehicles, the requirements for batteries are also becoming higher and higher. In recent years, 12V lithium batteries widely used in new energy vehicles have great advantages in life, weight, rate and other aspects compared with traditional lead-acid batteries, and since the battery has a MOS switch, the MOS can be controlled to implement protection strategies when under-voltage or failure occurs. The problem caused by the protection of the MOS tube is that when the 12V lithium battery is under-voltage, the customer cannot directly restart the vehicle by externally connecting the power as in the lead-acid battery, but needs to disassemble the battery and use special equipment to repair the power. That is, the lithium battery used in the existing new energy vehicle has the technical problems of high difficulty and low efficiency in restarting the vehicle after under-voltage. SUMMARY

[0003] The purpose of the present application is to provide a lithium battery under-voltage repair method, system and vehicle to alleviate the technical problems of high difficulty and low efficiency in restarting the vehicle after under-voltage in the prior art.

[0004] In a first aspect, the embodiments of the present application provide a lithium battery under-voltage repair method, which is applied to a lithium battery under-voltage repair system, wherein the system comprises a lithium battery low-voltage system, a vehicle control module, a lithium battery control module and a DCDC direct current conversion module; the lithium battery low-voltage system is used to supply low-voltage power to the vehicle control module; the vehicle control module is used to control the corresponding unit to enter a high-voltage process; and the method comprises the following steps:

[0005] detecting the state of the lithium battery control module by using the vehicle control module;

[0006] when the state information of the lithium battery control module is detected, controlling the corresponding unit by using the vehicle control module to make the vehicle enter the high-voltage process;

[0007] requesting voltage output by the DCDC direct current conversion module according to the state information of the lithium battery control module;

[0008] when the lithium battery control module detects that the external voltage is greater than the internal voltage and the pressure difference between the external voltage and the internal voltage satisfies a first threshold value, closing the MOS tube in the lithium battery low-voltage system to make the lithium battery low-voltage system enter a normal charging process, so as to complete the under-voltage repair.

[0009] In some optional implementations, before the step of detecting the state of the lithium battery control module by the vehicle control module, the method further comprises: powering the lithium battery low-voltage system by an external power supply, and starting the vehicle control module.

[0010] In some optional implementations, the vehicle control module comprises: a power battery management system BMS and a vehicle power domain control unit MDCU; and the step of detecting the state of the lithium battery control module by the vehicle control module comprises: detecting the state of the lithium battery control module by the vehicle power domain control unit MDCU.

[0011] In some optional implementations, before the step of controlling corresponding units by the vehicle control module to make the vehicle enter the high-voltage process, the method further comprises: detecting the state information of the lithium battery control module, and excluding other high-voltage faults.

[0012] In some optional implementations, when the state information of the lithium battery control module is detected, the step of controlling corresponding units by the vehicle control module to make the vehicle enter the high-voltage process comprises: when the state information of the lithium battery control module is detected, performing self-checking by the power battery management system BMS, and controlling corresponding relay units to complete the high-voltage process.

[0013] In some optional implementations, when the lithium battery control module detects that the external voltage is greater than the internal voltage and the pressure difference between the external voltage and the internal voltage satisfies a first threshold, the step of closing the MOS tube in the lithium battery low-voltage system comprises: when the lithium battery control module detects that the external voltage is greater than the internal voltage and the pressure difference between the external voltage and the internal voltage satisfies the first threshold, actively closing the MOS tube in the lithium battery low-voltage system; wherein the external voltage is the voltage of the DCDC direct current conversion module outside the MOS tube switch, and the internal voltage is the voltage inside the MOS tube switch.

[0014] In some optional implementations, when the lithium battery control module detects that the external voltage is greater than the internal voltage and the pressure difference between the external voltage and the internal voltage satisfies a first threshold, the step of closing the MOS tube in the lithium battery low-voltage system further comprises: when the lithium battery control module detects that the external voltage is greater than the internal voltage and the pressure difference between the external voltage and the internal voltage satisfies the first threshold, controlling the closing of the MOS tube in the lithium battery low-voltage system by the vehicle power domain control unit MDCU.

[0015] In some optional implementations, after the step of detecting the state information of the lithium battery control module, the method further comprises: after the DCDC direct current conversion module is in normal operation, sending, by the vehicle control module, prompt information of removing the external power supply to a vehicle instrument.

[0016] In a second aspect, the embodiments of the present application provide a lithium battery under-voltage repair system, which executes the steps of the lithium battery under-voltage repair method in any one of the first aspect.

[0017] In a third aspect, the embodiments of the present application provide a vehicle, which comprises the lithium battery under-voltage repair system in the second aspect.

[0018] The present application provides a lithium battery under-voltage repair method, system and vehicle, the method comprising: detecting, by a vehicle control module, a state of a lithium battery control module; when detecting state information of the lithium battery control module, controlling, by the vehicle control module, corresponding units to make the vehicle enter a high-voltage process; a DCDC direct current conversion module outputs voltage according to the state information of the lithium battery control module; when the lithium battery control module detects that an external voltage is greater than an internal voltage and a pressure difference between the external voltage and the internal voltage satisfies a first threshold, closing a MOS tube in a lithium battery low-voltage system, so that the lithium battery low-voltage system enters a normal charging process to complete under-voltage repair. Through the method, the technical problems of difficulty and low efficiency in restarting the vehicle after under-voltage in the prior art are alleviated, and the technical effect of improving the convenience of vehicle under-voltage restart is achieved. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the specific embodiments or the prior art description. Obviously, the drawings in the following description are some embodiments of the present application, and those skilled in the art can obtain other drawings according to these drawings without creative labor.

[0020] Figure 1 A flowchart of a lithium battery under-voltage repair method provided by an embodiment of the present application;

[0021] Figure 2 A structural schematic diagram of a lithium battery under-voltage repair system provided by an embodiment of the present application;

[0022] Figure 3 A flowchart of a lithium battery under-voltage repair method in an embodiment provided by an embodiment of the present application;

[0023] Figure 4A schematic diagram of a 12V lithium battery under-voltage fault type corresponding and repairing method in an embodiment provided by the embodiment of the present application. DETAILED DESCRIPTION

[0024] In order to make the purpose, technical scheme and advantages of the embodiment of the present application clearer, the technical scheme in the embodiment of the present application will be described clearly and completely below in combination with the drawings in the embodiment of the present application. Obviously, the described embodiment is a part of the embodiments of the present application, rather than all the embodiments of the present application. The components of the embodiment of the present application described and shown in the drawings can be arranged and designed in various different configurations.

[0025] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative labor are within the scope of protection of the present application.

[0026] It should be noted that similar reference numerals and letters represent similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. Some embodiments of the present application will be described in detail below in combination with the drawings. The following embodiments and features in the embodiments can be combined with each other without conflict.

[0027] In recent years, 12V lithium batteries widely used in new energy vehicles have great advantages in life, weight, rate and the like compared with traditional lead-acid batteries, and since the battery has a MOS switch, the MOS can be controlled to perform a protection strategy when under-voltage or fault occurs. The problem caused by the protection of the MOS tube is that after the 12V lithium battery is under-voltage, the customer cannot directly restart the vehicle in the form of external power connection as the lead-acid battery, but needs to disassemble the battery and use special equipment to repair the power, which usually needs to be shipped to the after-sales service point for maintenance. That is, the lithium battery applied in the existing new energy vehicle has the technical problems of great difficulty in restarting the vehicle after under-voltage and low efficiency.

[0028] Based on this, the embodiment of the present application provides a lithium battery under-voltage repairing method, system and vehicle to alleviate the technical problems of great difficulty in restarting the vehicle after under-voltage and low efficiency in the prior art.

[0029] In order to facilitate the understanding of the present embodiment, first, a lithium battery under-voltage repairing method disclosed by the embodiment of the present application will be introduced in detail, referring to Figure 1 A flowchart of a lithium battery under-voltage repairing method is shown in the figure, and the method is applied to a lithium battery under-voltage repairing system.

[0030] Referring toFigure 2 The lithium battery under-voltage repair system shown in the embodiment comprises a lithium battery low-voltage system 20, a vehicle control module 21, a lithium battery control module 22, and a DCDC direct current conversion module 23. The lithium battery low-voltage system 20 is configured to supply low-voltage power to the vehicle control module 21. The vehicle control module 21 is configured to control corresponding units to enter a high-voltage process.

[0031] The lithium battery under-voltage repair method applied to the lithium battery under-voltage repair system provided in the embodiment mainly comprises the following steps S110 to S140: S110: detecting the state of the lithium battery control module by using the vehicle control module;

[0032] S120: when the state information of the lithium battery control module is detected, controlling corresponding units by the vehicle control module to make the vehicle enter a high-voltage process;

[0033] S130: requesting voltage output by the DCDC direct current conversion module according to the state information of the lithium battery control module;

[0034] S140: when the lithium battery control module detects that the external voltage is greater than the internal voltage and the pressure difference between the external voltage and the internal voltage satisfies a first threshold value, closing the MOS tube in the lithium battery low-voltage system to make the lithium battery low-voltage system enter a normal charging process to complete under-voltage repair.

[0035] That is, when the lithium battery control module detects that the external voltage is greater than the internal voltage and the pressure difference between the external voltage and the internal voltage satisfies the first threshold value, the MOS tube in the lithium battery low-voltage system is actively closed.

[0036] In an embodiment, the internal voltage is 200 mV, and the first threshold value is 500 mV. The external voltage is the voltage of the DCDC direct current conversion module outside the MOS tube switch, and the internal voltage is the voltage inside the MOS tube switch.

[0037] In an embodiment, before the step of detecting the state of the lithium battery control module by using the vehicle control module, the method further comprises:

[0038] (11) supplying power to the lithium battery low-voltage system by using an external power supply and starting the vehicle control module.

[0039] The vehicle control module comprises a power battery management system BMS and a vehicle power domain control unit MDCU. Correspondingly, the step of detecting the state of the lithium battery control module by using the vehicle control module in the step S110 comprises the step of detecting the state of the lithium battery control module (IBS) by using the vehicle power domain control unit MDCU.

[0040] In an embodiment, before the step of controlling corresponding units by the vehicle control module to make the vehicle enter the high-voltage process in step S120, the method further comprises:

[0041] (12) detecting the state information (IBS signal) of the lithium battery control module, and excluding other high-voltage faults.

[0042] Wherein, the IBS signal is that the MOS tube is closed; the other high-voltage faults include the high-voltage system faults that cannot be eliminated, that is, the system fails to normally enter the high-voltage, and the instrument prompts the fault type and contacts the after-sales service.

[0043] In an embodiment, when detecting the state information of the lithium battery control module, the step of controlling corresponding units by the vehicle control module to make the vehicle enter the high-voltage process in step S120 comprises:

[0044] When detecting the state information of the lithium battery control module, the power battery management system BMS performs self-checking and controls the corresponding relay unit to complete the high-voltage process.

[0045] If the state information of the lithium battery control module cannot be detected, the instrument prompts to use the special wiring harness to firmly connect the lead-acid battery, which will be confirmed on the instrument display screen, and the vehicle control module MDCU is requested to enter the high-voltage to make the vehicle run. If the lead-acid battery cannot be fixed with the special wiring harness, the vehicle needs to be towed and repaired at the corresponding after-sales service point.

[0046] In an embodiment, when the lithium battery control module detects that the external voltage is greater than the internal voltage and the pressure difference between the external voltage and the internal voltage meets the first threshold, the step of closing the MOS tube in the lithium battery low-voltage system further comprises:

[0047] When the lithium battery control module detects that the external voltage is greater than the internal voltage and the pressure difference between the external voltage and the internal voltage meets the first threshold, the vehicle control module MDCU controls to close the MOS tube in the lithium battery low-voltage system. Wherein, the internal voltage is 200mV, and the first threshold is 500mV; the external voltage is the voltage of the DCDC direct current conversion module outside the MOS tube switch, and the internal voltage is the voltage inside the MOS tube switch.

[0048] In an embodiment, after the step of controlling corresponding units by the vehicle control module to make the vehicle enter the high-voltage process in step S120 when detecting the state information of the lithium battery control module, the method further comprises:

[0049] (13) After the DCDC direct current conversion module works normally, the vehicle control module sends a prompt information of removing the external power supply to the vehicle instrument.

[0050] That is, the vehicle enters the normal high-voltage process, completes the high-voltage process, and the DCDC works normally, and the vehicle instrument prompts the user to remove the external power bank.

[0051] When the vehicle is low in power, the controller powered by the 12V lithium battery cannot be started, and the traditional battery usually uses a charging circuit to charge the small battery to start; but due to the special nature of the lithium battery, it is easy to burn out when directly connected with the power bank. Therefore, the above-mentioned lithium battery under-voltage repair method is proposed, which uses an external power bank connected to the low-voltage system to start the controller; then the controller starts the high-voltage control power battery; the power battery supplies power, and the DCDC conversion circuit converts the power output by the power battery into power that can be used by the low-voltage system, that is, obtains stable 12V power, and uses it to close the MOS switch to charge the lithium battery. The focus of the application is to use the power bank to charge the low-voltage system to start it up. During the entire process of connecting the power bank, the switch of the lithium battery is always closed.

[0052] The working principle of the above-mentioned lithium battery under-voltage repair method provided by the embodiment of the application is as follows: when the 12V lithium battery closes the MOS tube, the low-voltage power supply system of the whole vehicle cannot supply power, and the external power bank can be directly used to start the whole vehicle. After the high-voltage of the whole vehicle is powered on by the external power bank, the state of the 12V lithium battery is detected, and when it is determined that it is simply under-voltage and the whole vehicle has no other faults that can be powered on, the high-voltage is powered on according to the normal high-voltage process; after the high-voltage is completed, the DCDC (direct current converter) normally outputs according to the request voltage of the 12V lithium battery, and the instrument prompts to remove the external power bank device; after the user removes the power bank according to the operation, the 12V lithium battery detects that the external voltage is within the request voltage range, and when the charging current is within the allowable range, the MOS tube is forcibly closed to charge the 12V lithium battery, and the whole vehicle completes the repair work.

[0053] The lithium battery under-voltage repair system provided by the embodiment of the application is used to execute the steps of the lithium battery under-voltage repair method described in any one of the above-mentioned embodiments.

[0054] In addition, the embodiment of the application also provides a vehicle, which comprises the lithium battery under-voltage repair system in any one of the above-mentioned embodiments.

[0055] As a specific example, when the user starts the vehicle after long-term storage, it is found that the vehicle cannot be unlocked, and the instrument cannot be lit, and the following steps are taken for repair to realize the vehicle starting process according to Figure 3 and Figure 4

[0056] ​(S301) Wake up using a mechanical switch with a hard wire; if wake-up is successful, (S302) the 12V lithium battery will charge normally; if wake-up fails, (S303) the 12V lithium battery will be unable to start the vehicle's low voltage and will be charged using an external power bank.

[0057] (S304) After charging, make a preliminary judgment on the cause of the fault. If there is no IBS signal (i.e., the status information of the lithium battery control module cannot be detected), then (S305) the 12V lithium battery itself is faulty (it is lower than 6V); if the instrument indicates a small battery fault, please contact after-sales service and tow the vehicle directly for repair; or use a special adapter harness to adopt a temporary solution with lead-acid batteries.

[0058] If an IBS signal is detected (i.e., the status information of the lithium battery control module is that the MOSFET is off), then it is (S306) a 12V lithium battery undervoltage fault; further determine the type of undervoltage fault.

[0059] See Figure 4 The following are the possible scenarios for determining the undervoltage fault type of a 12V lithium battery: (S410) If the high voltage cannot be applied normally, it is an unrecoverable high voltage system fault. Execute (S411) the fault type will be indicated by the instrument panel, and contact after-sales service for direct towing. (S420) If the high voltage can be applied normally, it is a recoverable high voltage system fault. Execute (S421) the 12V lithium battery charging process to complete the undervoltage repair. (S430) If the SOC of the large battery is below 6%, stop intelligent charging, start the range extender normally, and execute (S421) the 12V lithium battery charging process to complete the undervoltage repair.

[0060] (S301) includes: Step 1, press and hold the mechanical switch of the rear door handle for 5 seconds (the time should not exceed 30 seconds) and then release it. Observe whether the vehicle door lock can be unlocked and whether the vehicle can be driven on high voltage. If not, proceed with the following steps.

[0061] (S303) includes: Step 2, directly using the traditional jump-start method, using an external power bank to connect the positive terminal of the power bank to the positive terminal of the 12V lithium battery and the negative terminal of the power bank to the negative terminal of the 12V lithium battery.

[0062] (S304) includes: Step 3, after the power bank is connected, the vehicle's 12V low-voltage system is powered normally, and the vehicle control modules such as MDCU / BMS / MCU are awakened and working. The MDCU detects the status of the 12V lithium battery control module (IBS).

[0063] (S305) includes: Step 4: If IBS status information cannot be detected, the instrument will prompt that the lead-acid battery is securely connected using a dedicated wiring harness. Confirmation will be made on the instrument display screen, and the MDCU will request high voltage to enable the vehicle to move.

[0064] Step 5, if there is no special harness, the lead-acid battery can be fixed, and then contact the company after-sales to handle the trailer, and go to the designated after-sales for repair.

[0065] (S420) includes: step 6. If IBS information is detected in step 3, and there is no other high-voltage fault in the whole vehicle, the vehicle enters the normal high-voltage flow process, and after completing the high-voltage flow process and the DCDC normal work, the instrument prompts the user to remove the external power bank.

[0066] (S421) includes: step 7. The DCDC outputs according to the IBS request voltage, and the IBS actively closes the MOS tube (or the MDCU controls the closed MOS) when it detects that the external voltage is greater than the internal voltage by 200mV and the voltage difference is less than 500mV.

[0067] Step 8. The 12V lithium battery enters the normal charging flow process. The vehicle is successfully powered on, and the low-voltage system under-voltage repair is completed.

[0068] (S421) 12V lithium battery charging flow process includes: after pumping the lead-acid battery, normally charging the high voltage (or starting the range extender), the DCDC works, and the instrument prompts to remove the lead-acid battery. The DCDC outputs according to the IBS request voltage, and the IBS actively closes the MOS tube (or the MDCU controls the closed MOS) when it detects that the external voltage is greater than the internal voltage by 200mV and the voltage difference is less than 500mV.

[0069] When using an external power supply to charge, the vehicle high voltage can be powered on first, the chargeable power MAP of the lithium battery can be detected and controlled, the DCDC input voltage can be adjusted to ensure the safety of the lithium battery, the MOS tube can be automatically closed, the 12V lithium battery under-voltage repair can be operated by the customer, and the maintenance time and steps can be reduced.

[0070] The lithium battery under-voltage repair system provided in the embodiments of the present application can be specific hardware on a device or software or firmware installed on the device. The device provided in the embodiments of the present application has the same implementation principle and technical effects as the foregoing method embodiments, and for the sake of brevity and conciseness, the part not mentioned in the device embodiment part can be referred to the corresponding content in the foregoing method embodiments. Those skilled in the art can clearly understand that, for the sake of brevity and conciseness, the specific working process of the system, device and unit described above can be referred to the corresponding process in the foregoing method embodiments, which will not be described herein. The lithium battery under-voltage repair system provided in the embodiments of the present application has the same technical features as the lithium battery under-voltage repair method provided in the foregoing embodiments, so it can also solve the same technical problems and achieve the same technical effects.

[0071] The electronic device includes a processor and a storage device. The storage device stores a computer program. When the computer program is executed by the processor, the method of any one of the above embodiments is executed.

[0072] The electronic device includes a processor, a memory, a bus and a communication interface. The processor, the communication interface and the memory are connected through the bus. The processor is used to execute the executable modules stored in the memory, such as a computer program.

[0073] The memory can include a high-speed random access memory (RAM) and can also include a non-volatile memory, such as at least one disk memory. The communication connection between the system network element and at least one other network element is realized through at least one communication interface (which can be wired or wireless). The Internet, a wide area network, a local area network, a metropolitan area network, etc. can be used.

[0074] The bus can be an ISA bus, a PCI bus, an EISA bus, etc. The bus can be divided into an address bus, a data bus, a control bus, etc.

[0075] The memory is used to store a program. The processor executes the program after receiving an execution instruction. The method executed by the device defined by the flow process disclosed in any one of the above embodiments can be applied to the processor or realized by the processor.

[0076] The processor can be an integrated circuit chip having a processing capability of signals. In the implementation process, each step of the above method can be completed by the integrated logic circuit of hardware in the processor or the instruction in the form of software. The processor mentioned above can be a general processor, including a central processing unit (CPU), a network processor (NP), etc.; can also be a digital signal processor (DSP), an application specific integrated circuit (ASIC), a field-programmable gate array (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components. Each method, step and logic block diagram disclosed in the embodiment of the present application can be implemented or executed. The general processor can be a microprocessor or the processor can also be any conventional processor. The steps of the method disclosed in combination with the embodiment of the present application can be directly embodied as a hardware decoding processor for execution, or executed by a combination of hardware and software modules in the decoding processor. The software module can be located in a random access memory, a flash memory, a read-only memory, a programmable read-only memory or an electrically erasable programmable memory, a register or other mature storage medium in the art. The storage medium is located in the memory, and the processor reads the information in the memory and combines the hardware to complete the steps of the above method.

[0077] Corresponding to the above method, the embodiment of the present application further provides a computer readable storage medium, the computer readable storage medium stores machine executable instructions, when the processor calls and runs the computer executable instructions, the computer executable instructions make the processor run the steps of the above method.

[0078] In the embodiments provided by the present application, it should be understood that the disclosed devices, systems and methods can be implemented in other ways. The device embodiments described above are only schematic. For example, the division of the units is only a logical function division, and there can be another division manner in actual implementation. For example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the displayed or discussed mutual coupling or direct coupling or communication connection can be indirect coupling or communication connection through some communication interface, device or unit, and can be electrical, mechanical or other forms.

[0079] The units described as separate components may or may not be physically separate, and the components displayed as units may or may not be physical units, i.e. may be located in one place, or may be distributed on multiple network units. Part or all of the units can be selected according to actual needs to achieve the purpose of the embodiment scheme.

[0080] In addition, the functional units in the embodiments provided in the present application can be integrated in one processing unit, or each unit can exist physically, or two or more units can be integrated in one unit.

[0081] When the functions are realized in the form of software function units and sold or used as independent products, they can be stored in a computer readable storage medium. Based on this understanding, the technical solutions of the present application or the parts of the present application that essentially contribute to the prior art or the parts of the technical solutions can be embodied in the form of software products. The computer software product is stored in a storage medium, and includes a plurality of instructions for causing a computer device (which can be a personal computer, an electronic device, or a network device, etc.) to execute all or part of the steps of the method described in the various embodiments of the present application. The aforementioned storage medium includes: a U disk, a mobile hard disk, a read-only memory (ROM, Read-Only Memory), a random access memory (RAM, Random Access Memory), a magnetic disk or an optical disk, and various program code storage media.

[0082] It should be noted that: similar reference numbers and letters represent similar items in the drawings, therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings, and in addition, the terms "first", "second", "third" and the like are only used to distinguish description, and cannot be understood as indicating or implying relative importance.

[0083] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A method for repairing undervoltage in lithium batteries, characterized in that, An application is made in a lithium battery undervoltage repair system, the system comprising: a lithium battery low-voltage system, a vehicle control module, a lithium battery control module, and a DC-DC converter module; the lithium battery low-voltage system provides low-voltage power to the vehicle control module; the vehicle control module controls corresponding units to initiate a high-voltage process; the method includes: The lithium battery low-voltage system is powered by an external power source, and the vehicle control module is started. The vehicle control module is used to detect the status of the lithium battery control module; and based on the detected status information of the lithium battery control module, other high-voltage faults are eliminated. When the status information of the lithium battery control module is detected, the vehicle control module controls the corresponding unit to enable the vehicle to enter the high voltage process; The DC-DC converter module requests voltage output based on the status information of the lithium battery control module; When the lithium battery control module detects that the external voltage is greater than the internal voltage and the voltage difference between the external voltage and the internal voltage meets a first threshold, it closes the MOSFET in the low-voltage lithium battery system, allowing the low-voltage lithium battery system to enter the normal charging process to complete the undervoltage repair; wherein, the internal voltage is 200mV, the first threshold is 500mV; the voltage difference between the external voltage and the internal voltage meets the first threshold when the voltage difference between the external voltage and the internal voltage is less than 500mV; After the DC-DC converter module is working normally, the vehicle control module sends a prompt message to the vehicle instrument panel to remove the external power supply.

2. The lithium battery undervoltage repair method according to claim 1, characterized in that, The vehicle control module includes: a power battery management system (BMS) and a vehicle power domain control unit (MDCU); The steps for detecting the status of the lithium battery control module using the vehicle control module include: The status of the lithium battery control module is detected using the vehicle power domain control unit (MDCU).

3. The lithium battery undervoltage repair method according to claim 2, characterized in that, When the status information of the lithium battery control module is detected, the vehicle control module controls the corresponding unit to enable the vehicle to enter the high-voltage process, including: When the status information of the lithium battery control module is detected, the power battery management system (BMS) performs a self-test and controls the corresponding relay unit to complete the high-voltage process.

4. The lithium battery undervoltage repair method according to claim 2, characterized in that, When the lithium battery control module detects that the external voltage is greater than the internal voltage and the voltage difference between the external voltage and the internal voltage meets a first threshold, the step of closing the MOSFET in the low-voltage system of the lithium battery includes: When the lithium battery control module detects that the external voltage is greater than the internal voltage and the voltage difference between the external voltage and the internal voltage meets a first threshold, it actively closes the MOSFET in the low-voltage system of the lithium battery; wherein, the external voltage is the voltage of the DC-DC converter module outside the MOSFET switch, and the internal voltage is the voltage inside the MOSFET switch.

5. The lithium battery undervoltage repair method according to claim 4, characterized in that, The step of closing the MOSFET in the low-voltage system of the lithium battery when the lithium battery control module detects that the external voltage is greater than the internal voltage and the voltage difference between the external voltage and the internal voltage meets a first threshold further includes: When the lithium battery control module detects that the external voltage is greater than the internal voltage and the voltage difference between the external voltage and the internal voltage meets the first threshold, the vehicle power domain control unit (MDCU) controls the MOSFET in the low-voltage system of the lithium battery to close.

6. A lithium battery undervoltage repair system, characterized in that, The system performs the steps of the method according to any one of claims 1 to 5.

7. A vehicle, characterized in that, Including the lithium battery undervoltage repair system as described in claim 6.

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