Battery management system awakening method and power supply system

Abstract

The embodiment of the invention provides a battery management system awakening method and a power supply system, and relates to the technical field of battery management. The method is applied to the power supply system, the power supply system comprises a battery module, a battery management system, a shunt, a first charging line and a second charging line, the battery management system comprises an analog front end and a control module, the positive electrode of the battery module is connected with the first charging line, the negative electrode of the battery module is connected with the second charging line, and the shunt is arranged on the second charging line. The method comprises the steps that the analog front end detects the current value of the shunt according to a preset period, the analog front end judges whether the current value is larger than preset wake-up current or not, and if yes, the analog front end judges that the battery module is in a charging state and sends a wake-up signal to the control module, so that the control module recovers to a normal working state. Therefore, the communication analog front end can realize current detection without intervention of other devices, so that the power consumption of the power supply system in a dormant state is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of battery management, and in particular to a battery management system awakening method and a power supply system. Background Art

[0002] During actual vehicle use or during vehicle commissioning of newly designed models, the 12V battery will inevitably need to be powered up. To quickly recharge the battery, an external charger is required. However, blind chargers lack battery voltage detection capabilities and are unable to wake the 12V battery from sleep mode. Consequently, battery voltage and temperature cannot be monitored, which can easily lead to battery overvoltage, overheating, and other issues.

[0003] In related technologies, most battery status monitoring methods use a timed wake-up method. That is, after dormancy, the system automatically wakes up from sleep mode at set intervals, then monitors the battery status by collecting information such as battery voltage and temperature. If there are no abnormalities, the system continues to sleep until the next scheduled time. However, scheduled wake-up requires waking up the battery management system, which consumes a lot of power overall. Frequent scheduled wake-ups can seriously affect the battery charge. Moreover, if the battery is blindly charged during the sleep-wake-up interval, the battery may not be monitored, and safety issues such as overcharging and overheating may occur. Summary of the Invention

[0004] In view of this, an object of embodiments of the present invention is to provide a battery management system wake-up method and a power supply system to at least partially improve the above-mentioned problem.

[0005] In order to achieve the above objectives, the technical solutions adopted in the embodiments of the present invention are as follows: In a first aspect, an embodiment of the present invention provides a battery management system wake-up method, which is applied to a power supply system, wherein the power supply system includes a battery module, a battery management system, a shunt, a first charging line, and a second charging line. The battery management system includes an analog front end and a control module. The positive electrode of the battery module is connected to the first charging line, the negative electrode of the battery module is connected to the second charging line, the shunt is provided on the second charging line, the analog front end is connected to both ends of the shunt, and the analog front end is also in communication with the control module. The method includes: The analog front end detects the current value of the shunt according to a preset period; The analog front end determines whether the current value is greater than a preset wake-up current; If so, the analog front end determines that the battery module is in a charging state, and sends a wake-up signal to the control module to restore the control module to a normal working state.

[0006] Optionally, the control module includes a system basis chip and a microcontroller unit, the system basis chip is connected to the analog front end via a first wake-up line, the system basis chip is further connected to the positive electrode of the battery module, and the system basis chip is further connected to the microcontroller unit via a second wake-up line; sending a wake-up signal to the control module to restore the control module to a normal working state includes: The analog front end sets the Wakeup pin of the system basis chip to a high level through the first wake-up line to restore the system basis chip to a normal working state; After the system basis chip returns to a normal working state, the system basis chip outputs a voltage signal to the microcontroller unit to restore the microcontroller unit to a normal working state.

[0007] Optionally, the power supply system further includes a relay provided on the first charging line, and the method further includes: When the battery management system detects that the battery module has been charged, the microcontroller unit sends a relay disconnection signal to disconnect the relay, thereby ending the charging state of the battery module.

[0008] Optionally, the method further includes: When the battery management system detects that an abnormality occurs in the battery module, the microcontroller unit sends a relay disconnection signal to disconnect the relay, thereby terminating the charging state of the battery module.

[0009] Optionally, the microcontroller unit is further connected to the second charging line and the first charging line, and a connection point between the microcontroller unit and the first charging line is located on a side of the relay away from the battery module; the method further includes: When the microcontroller unit detects that the first charging line and the second charging line are not connected to a charger, the microcontroller unit sends a relay closing signal to close the relay.

[0010] Optionally, the method further includes: The analog front end monitors the voltage of the battery module; When the voltage is less than a preset voltage value, the analog front end sends the voltage to the microcontroller unit; The microcontroller unit issues a relay closing signal to close the relay.

[0011] Optionally, the battery module includes 4 strings of single cells; wherein the single cells are lithium iron phosphate cells.

[0012] In a second aspect, an embodiment of the present invention provides a power supply system, including a battery module, a battery management system, a shunt, a first charging line, and a second charging line. The battery management system includes an analog front end and a control module. The positive electrode of the battery module is connected to the first charging line, the negative electrode of the battery module is connected to the second charging line, the shunt is provided on the second charging line, the analog front end is connected to both ends of the shunt, and the analog front end is also in communication with the control module. The analog front end is used to detect the current value of the shunt according to a preset period; The analog front end is used to determine whether the current value is greater than a preset wake-up current; If so, the analog front end is used to determine that the battery module is in a charging state and send a wake-up signal to the control module to restore the control module to a normal working state.

[0013] Optionally, the control module includes a system basis chip and a microcontroller unit, the system basis chip is connected to the analog front end via a first wake-up line, the system basis chip is further connected to the positive electrode of the battery module, and the system basis chip is further connected to the microcontroller unit via a second wake-up line; The analog front end is further configured to set the Wakeup pin of the system basis chip to a high level via the first wake-up line, so as to restore the system basis chip to a normal working state; After the system basis chip returns to a normal working state, the system basis chip is used to output a voltage signal to the microcontroller unit to restore the microcontroller unit to a normal working state.

[0014] Optionally, the power supply system further includes a relay provided on the first charging line; When the battery management system detects that the battery module has been charged, the microcontroller unit sends a relay disconnection signal to disconnect the relay, thereby ending the charging state of the battery module.

[0015] An embodiment of the present invention provides a battery management system wake-up method and power supply system, which detects the shunt current value according to a preset period through an analog front end, and sends a wake-up signal to the control module only when specific conditions are met (the current value is greater than the preset wake-up current). This allows the control module to maintain a low-power sleep state most of the time, reducing the overall energy consumption of the system, especially when the battery module is not in a charging state, effectively extending the system's battery life.

[0016] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are given below and described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 A schematic structural block diagram of a power supply system provided in an embodiment of the present invention; Figure 2 A flowchart of a battery management system wake-up method provided by an embodiment of the present invention; Figure 3 Another schematic structural block diagram of a power supply system provided by an embodiment of the present invention; Figure 4 Another flowchart of a battery management system wake-up method provided by an embodiment of the present invention; Figure 5 Another schematic structural block diagram of a power supply system provided by an embodiment of the present invention; Figure 6 Another flowchart of a battery management system wake-up method provided by an embodiment of the present invention; Figure 7 Another schematic structural block diagram of a power supply system provided by an embodiment of the present invention; Figure 8 Another flowchart of a battery management system wake-up method provided by an embodiment of the present invention; Figure 9 Another flowchart of a battery management system wake-up method provided by an embodiment of the present invention.

[0019] Icons: 100-power system; 110-battery module; 120-battery management system; 121-analog front end; 122-control module; 1221-system basis chip; 1222-microcontroller unit; 130-shunt; 140-first charging line; 150-second charging line; 160-first wake-up line; 170-second wake-up line; 180-relay. DETAILED DESCRIPTION

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings herein can be arranged and designed in various different configurations.

[0021] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the invention as claimed, but rather merely represents selected embodiments of the present invention. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort shall fall within the scope of protection of the present invention.

[0022] It should be noted that similar reference numerals and letters represent similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings. At the same time, in the description of the present invention, the terms "first", "second", etc. are used only to distinguish the description and should not be understood as indicating or implying relative importance.

[0023] It should be noted that, in this document, relational terms such as first and second, etc., are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply the existence of any such actual relationship or order between these entities or operations. Moreover, the terms "comprises," "comprising," or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article, or device comprising a series of elements includes not only those elements, but also other elements not explicitly listed, or elements inherent to such process, method, article, or device. In the absence of further limitations, an element defined by the phrase "comprising a ..." does not exclude the presence of other identical elements in the process, method, article, or device comprising the element.

[0024] As described in the background technology, the related art uses a timed wake-up method to monitor the battery status. That is, after dormancy, the system automatically wakes up from sleep mode at set intervals, and then monitors the battery status by collecting information such as battery voltage and temperature. If there are no abnormalities, the system continues to enter sleep mode and will not wake up again until the next scheduled time. However, when waking up on a scheduled basis, the battery management system needs to be awakened, which results in high overall power consumption. Frequent timed wake-ups will seriously affect the battery charge. Moreover, if the battery is blindly charged during the time interval between dormancy and wake-up, the battery may not be monitored, and safety issues such as overcharging and overheating may also occur.

[0025] Based on the above situation, an embodiment of the present invention provides a battery management system wake-up method and power supply system, which detects the shunt current value according to a preset period through an analog front end, and sends a wake-up signal to the control module only when the current value is greater than the preset wake-up current, so that the control module can maintain a low-power sleep state most of the time, reducing the overall energy consumption of the system, especially when the battery module is not in a charging state, effectively extending the system's battery life.

[0026] The following is an exemplary description of the battery management system wake-up method provided by the present invention. Figure 1 A schematic structural block diagram of a power supply system provided in an embodiment of the present invention is provided. Figure 2 A flowchart of a battery management system wake-up method provided by an embodiment of the present invention is shown in FIG. Figure 1 、 Figure 2 The method is applied to a power supply system 100, which includes a battery module 110, a battery management system 120, a shunt 130, a first charging line 140, and a second charging line 150. The battery management system 120 includes an analog front end 121 and a control module 122. The positive electrode of the battery module 110 is connected to the first charging line 140, the negative electrode of the battery module 110 is connected to the second charging line 150, the shunt 130 is arranged on the second charging line 150, the analog front end 121 is connected to both ends of the shunt 130, and the analog front end 121 is also in communication with the control module 122. The method includes the following steps: Figure 2 The following steps are shown: S210: The analog front end detects the current value of the shunt according to a preset period.

[0027] S220: The analog front end determines whether the current value is greater than the preset wake-up current. If so, step S230 is executed; if not, step S210 is executed.

[0028] S230: The analog front end determines that the battery module is in a charging state, and sends a wake-up signal to the control module to restore the control module to a normal working state.

[0029] When the battery is not operating or charging, the control module 122 in the battery management system 120 is in a dormant state. Only the analog front-end 121 is operational. The analog front-end 121 (AFE) independently performs inspections, detecting the current value of the shunt 130 at a preset period (e.g., 1 second). Shunt 130 is a precision current sensing element based on Ohm's law. By measuring the tiny voltage drop (V = I × R) generated by current flowing through shunt 130, high-precision sampling of the battery's charge and discharge current is achieved.

[0030] After collecting the current value, a check is performed to determine whether it exceeds a preset wake-up current (for example, 1A). If so, the battery module 110 is determined to be charging, and a wake-up signal is sent to the control module 122 to restore the control module 122 to normal operation. After the control module 122 resumes normal operation, it will continue to monitor the battery voltage, temperature, and other conditions. If the current value is not greater than the preset wake-up current, the current value of the shunt 130 is re-tested.

[0031] This method significantly reduces the power consumption of the entire system by placing the control module 122 in a dormant state when the battery is not charging or not working. The control module 122 is awakened only when the battery status needs to be monitored (e.g., charging starts), thereby saving unnecessary energy consumption.

[0032] See also Figure 3 The control module 122 includes a system basis chip 1221 and a microcontroller unit 1222. The system basis chip 1221 is connected to the analog front end 121 via a first wake-up line 160. The system basis chip 1221 is also connected to the positive electrode of the battery module 110. The system basis chip 1221 is also connected to the microcontroller unit 1222 via a second wake-up line 170. Figure 4 , step S230 may include the following steps: S231: The analog front end sets the Wakeup pin of the system basis chip to a high level through the first wake-up line to restore the system basis chip to a normal working state.

[0033] Among them, the System Base Chip 1221 (SBC) is a highly integrated multi-functional chip that is mainly used to provide core functions such as power management, communication interface, system monitoring and protection for the power management system.

[0034] S232: After the system basis chip returns to a normal working state, the system basis chip outputs a voltage signal to the microcontroller unit to restore the microcontroller unit to a normal working state.

[0035] Among them, the microcontroller unit 1222 (MCU) is responsible for calculating battery data (such as voltage, temperature, and current) in real time, executing core algorithms (balancing control), coordinating communications, and triggering protection mechanisms (such as overvoltage shutdown).

[0036] The analog front-end 121 determines that the battery module 110 is charging and sends a wake-up signal to the SBC. The analog front-end 121 sets its wakeup pin high to notify the SBC of new activity. Upon detecting the high signal on the wakeup pin, the SBC wakes up from its sleep state. The SBC's internal power management unit activates and begins providing the necessary power. Once awakened, the SBC outputs a voltage signal (e.g., a 5V power supply) to wake the MCU. The SBC provides a stable voltage through its power output pin, which is essential for the MCU's normal operation. After receiving the voltage signal, the MCU returns to normal operation from its sleep state. Once fully booted up, the MCU begins performing its intended tasks, such as monitoring the battery's voltage and temperature.

[0037] In an optional implementation, the process includes the following steps: 1. The AFE detects that the current value exceeds the preset threshold.

[0038] 2. AFE sets the Wakeup pin to a high level.

[0039] 3. The SBC wakes up after detecting a high level signal on the Wakeup pin.

[0040] 4. SBC outputs 5V power supply.

[0041] 5. After receiving the 5V power supply, the MCU wakes up and enters normal working state.

[0042] 6. The MCU starts monitoring and managing the battery status.

[0043] In order to ensure the safety of the battery charging process and avoid the occurrence of safety accidents, a relay 180 can be set to disconnect the charging. Figure 5 The power supply system 100 may further include a relay 180 provided on the first charging line 140, see Figure 6 , the method may further comprise the following steps: S240: When the battery management system detects that the battery module is fully charged, the microcontroller unit sends a relay disconnection signal to disconnect the relay, thereby terminating the charging state of the battery module.

[0044] The MCU continuously monitors the status of the battery module 110, including parameters such as voltage, current, and temperature. Based on a preset charging algorithm and battery characteristics, the MCU determines whether the battery module 110 is fully charged. When the MCU detects that the battery module 110 has reached the preset fully charged condition (for example, the battery voltage reaches a specific value and the charging current drops below a certain threshold), the MCU determines that charging is complete. The MCU outputs a low or high signal through its GPIO (General Purpose Input / Output) pin. For example, if relay 180 is normally closed, the MCU outputs a high signal to disconnect relay 180; if it is normally open, the MCU outputs a low signal to disconnect relay 180. This energizes the electromagnetic coil inside relay 180, generating a magnetic field that causes the contacts of relay 180 to change from a closed state to an open state. This disconnects the charging circuit and stops charging the battery module 110.

[0045] As above, when an abnormality occurs in the battery module 110, charging also needs to be disconnected. Therefore, the method may further include: S240`: When the battery management system detects that the battery module is abnormal, the microcontroller unit sends a relay disconnection signal to disconnect the relay, thereby ending the charging state of the battery module.

[0046] When an abnormality is detected in the battery module 110 , the relay 180 is disconnected by the above-mentioned relay 180 disconnection logic, which will not be described in detail here.

[0047] In order to close the relay 180 after the charging is completed so that the relay 180 can be connected for the next charging, in a possible implementation, see Figure 7 The microcontroller unit 1222 is also connected to the second charging line 150 and the first charging line 140. The connection point between the microcontroller unit 1222 and the first charging line 140 is located on the side of the relay 180 away from the battery module 110. Figure 8 , the method may further include: S250: When the microcontroller unit detects that the first charging line and the second charging line are not connected to the charger, the microcontroller unit sends a relay closing signal to close the relay.

[0048] The microcontroller unit 1222 is connected to the second charging line 150 and the end of the first charging line 140 away from the positive terminal of the battery module 110. The microcontroller unit 1222 can detect whether the power supply system 100 is currently connected to a charger. If it detects that a charger is not connected, the microcontroller unit 1222 sends a closing signal to the relay 180 to close the relay 180 and prepare for the next charging.

[0049] In another possible implementation, the battery can detect whether the voltage of the battery module 110 decreases during operation, and if the voltage decreases, the relay 180 is closed. Figure 9 , the method may further comprise the following steps: S260: Analog front end monitors the voltage of the battery module.

[0050] S270: When the voltage is less than the preset voltage value, the analog front end sends the voltage to the microcontroller unit.

[0051] S280: The microcontroller unit sends a relay closing signal to close the relay.

[0052] The AFE continuously monitors the voltage of the battery module 110. If the monitored voltage falls below a preset threshold, the AFE sends the voltage value to the MCU. The MCU receives the voltage value and makes an assessment. If the voltage value falls below a preset threshold, the MCU generates a signal to close relay 180. The control circuit of relay 180 receives the signal and triggers relay 180 to close.

[0053] Optionally, the battery module 110 includes four strings of single cells, wherein the single cells are lithium iron phosphate cells.

[0054] Lithium batteries are different from traditional lead-acid batteries. They are sensitive to overcharging and overheating, and need to be monitored and protected at all times during the charging process. Otherwise, there may be a risk of thermal runaway or even fire and explosion. This method can better ensure the safety of lithium batteries.

[0055] Furthermore, the embodiment of the present invention also provides a power supply system 100, see Figure 1 , including a battery module 110, a battery management system 120, a shunt 130, a first charging line 140 and a second charging line 150. The battery management system 120 includes an analog front end 121 and a control module 122. The positive pole of the battery module 110 is connected to the first charging line 140, and the negative pole of the battery module 110 is connected to the second charging line 150. The shunt 130 is arranged on the second charging line 150. The analog front end 121 is connected to both ends of the shunt 130. The analog front end 121 is also communicatively connected to the control module 122.

[0056] The analog front end 121 is configured to detect the current value of the shunt 130 according to a preset period.

[0057] The analog front end 121 is used to determine whether the current value is greater than a preset wake-up current.

[0058] If so, the analog front end 121 is used to determine that the battery module 110 is in a charging state, and send a wake-up signal to the control module 122 to restore the control module 122 to a normal working state.

[0059] See also Figure 3 The control module 122 may also include a system basic chip 1221 and a microcontroller unit 1222. The system basic chip 1221 is connected to the analog front end 121 through a first wake-up line 160. The system basic chip 1221 is also connected to the positive pole of the battery module 110. The system basic chip 1221 is also connected to the microcontroller unit 1222 through a second wake-up line 170.

[0060] The analog front end 121 is further configured to set the Wakeup pin of the system basis chip 1221 to a high level through the first wakeup line 160 , so as to restore the system basis chip 1221 to a normal working state.

[0061] After the system basis chip 1221 returns to a normal working state, the system basis chip 1221 is used to output a voltage signal to the microcontroller unit 1222 to restore the microcontroller unit 1222 to a normal working state.

[0062] See also Figure 5The power supply system 100 may further include a relay 180 arranged on the first charging line 140; when the battery management system 120 detects that the battery module 110 is fully charged, the microcontroller unit 1222 sends a relay 180 disconnect signal to disconnect the relay 180, thereby ending the charging state of the battery module 110.

[0063] In summary, the embodiments of the present invention provide a battery management system wake-up method and power supply system, which detects the shunt current value according to a preset period through the analog front end, and sends a wake-up signal to the control module only when the current value is greater than the preset wake-up current, so that the control module can maintain a low-power sleep state for most of the time, reducing the overall energy consumption of the system, especially when the battery module is not in a charging state, effectively extending the system's battery life; after the battery module is charged or an abnormality occurs, the microcontroller unit sends a relay disconnect signal to end the charging state and prevent overcharging; when it is detected that the first charging line and the second charging line are not connected to the charger, the microcontroller unit sends a relay closing signal to ensure that the power supply system can be charged normally next time.

[0064] In the embodiments provided by the present invention, it should be understood that the disclosed devices and methods can also be implemented in other ways. The device embodiments described above are merely illustrative. For example, the flowcharts and block diagrams in the accompanying drawings show the possible architectures, functions, and operations of the devices, methods, and computer program products according to multiple embodiments of the present invention. In this regard, each box in the flowchart or block diagram can represent a module, program segment, or part of the code, which contains one or more executable instructions for implementing the specified logical functions. It should also be noted that in some alternative implementations, the functions marked in the boxes can also occur in an order different from that marked in the accompanying drawings. For example, two consecutive boxes can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each box in the block diagram and / or flowchart, as well as the combination of boxes in the block diagram and / or flowchart, can be implemented using a dedicated hardware-based system that performs the specified functions or actions, or can be implemented using a combination of dedicated hardware and computer instructions.

[0065] In addition, the functional modules in the various embodiments of the present invention may be integrated together to form an independent part, or each module may exist independently, or two or more modules may be integrated to form an independent part.

[0066] If a function is implemented as a software module and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the portion that contributes to the prior art, or the portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a computer-readable storage medium and includes several instructions for causing a computer device (which can be a personal computer, server, or network device, etc.) to execute all or part of the steps of the various embodiments of the method of the present invention. The aforementioned storage medium includes various media that can store program code, such as USB flash drives, mobile hard drives, read-only memories (ROMs), random access memories (RAMs), magnetic disks, or optical disks.

[0067] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Those skilled in the art will readily appreciate that various modifications and variations of the present invention are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

[0068] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the invention can be embodied in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be included therein. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

Claims

1. A battery management system wake-up method, characterized in that: Applied to a power supply system, the power supply system includes a battery module, a battery management system, a shunt, a first charging line, and a second charging line. The battery management system includes an analog front end and a control module. The positive electrode of the battery module is connected to the first charging line, the negative electrode of the battery module is connected to the second charging line, the shunt is provided on the second charging line, the analog front end is connected to both ends of the shunt, and the analog front end is also communicatively connected to the control module. The method includes: The analog front end detects the current value of the shunt according to a preset period; The analog front end determines whether the current value is greater than a preset wake-up current; If so, the analog front end determines that the battery module is in a charging state, and sends a wake-up signal to the control module to restore the control module to a normal working state.

2. The method according to claim 1, characterized in that The control module includes a system basis chip and a microcontroller unit, the system basis chip is connected to the analog front end via a first wake-up line, the system basis chip is also connected to the positive electrode of the battery module, and the system basis chip is also connected to the microcontroller unit via a second wake-up line; sending a wake-up signal to the control module to restore the control module to a normal working state includes: The analog front end sets the Wakeup pin of the system basis chip to a high level through the first wake-up line to restore the system basis chip to a normal working state; After the system basis chip returns to a normal working state, the system basis chip outputs a voltage signal to the microcontroller unit to restore the microcontroller unit to a normal working state.

3. The method according to claim 2, characterized in that The power supply system further includes a relay provided on the first charging line, and the method further includes: When the battery management system detects that the battery module has been charged, the microcontroller unit sends a relay disconnection signal to disconnect the relay, thereby ending the charging state of the battery module.

4. The method according to claim 3, characterized in that The method further comprises: When the battery management system detects that an abnormality occurs in the battery module, the microcontroller unit sends a relay disconnection signal to disconnect the relay, thereby terminating the charging state of the battery module.

5. The method according to claim 3, characterized in that The microcontroller unit is further connected to the second charging line and the first charging line, and the connection point between the microcontroller unit and the first charging line is located on a side of the relay away from the battery module; the method further includes: When the microcontroller unit detects that the first charging line and the second charging line are not connected to a charger, the microcontroller unit sends a relay closing signal to close the relay.

6. The method according to claim 3, characterized in that The method further comprises: The analog front end monitors the voltage of the battery module; When the voltage is less than a preset voltage value, the analog front end sends the voltage to the microcontroller unit; The microcontroller unit issues a relay closing signal to close the relay.

7. The method according to claim 1, characterized in that The battery module includes 4 strings of single cells; wherein the single cells are lithium iron phosphate cells.

8. A power supply system, characterized in that: The battery management system comprises a battery module, a battery management system, a shunt, a first charging line, and a second charging line. The battery management system comprises an analog front end and a control module. The positive electrode of the battery module is connected to the first charging line, the negative electrode of the battery module is connected to the second charging line, the shunt is arranged on the second charging line, the analog front end is connected to both ends of the shunt, and the analog front end is also in communication with the control module. The analog front end is used to detect the current value of the shunt according to a preset period; The analog front end is used to determine whether the current value is greater than a preset wake-up current; If so, the analog front end is used to determine that the battery module is in a charging state and send a wake-up signal to the control module to restore the control module to a normal working state.

9. The power supply system according to claim 8, characterized in that: The control module includes a system basis chip and a microcontroller unit, wherein the system basis chip is connected to the analog front end via a first wake-up line, the system basis chip is also connected to the positive electrode of the battery module, and the system basis chip is also connected to the microcontroller unit via a second wake-up line; The analog front end is further configured to set the Wakeup pin of the system basis chip to a high level via the first wake-up line, so as to restore the system basis chip to a normal working state; After the system basis chip returns to a normal working state, the system basis chip is used to output a voltage signal to the microcontroller unit to restore the microcontroller unit to a normal working state.

10. The power supply system according to claim 9, characterized in that: The power supply system further includes a relay provided on the first charging line; When the battery management system detects that the battery module has been charged, the microcontroller unit sends a relay disconnection signal to disconnect the relay, thereby ending the charging state of the battery module.

Images