Battery management system

Abstract

The embodiment of the utility model discloses a battery management system. The system comprises: a main control module configured to manage and control a battery management system; one end of the communication isolation module is electrically connected with the main control module; the wireless module is electrically connected with the other end of the communication isolation module, the wireless module is configured to perform wireless communication with the outside of the battery management system, so that the state information of a battery where the battery management system is located can be remotely obtained, remote monitoring of the battery is realized, and meanwhile, the communication isolation module is arranged between the main control module and the wireless module, so that the communication isolation module can realize remote monitoring of the battery. Interference of the outside to the battery management system can be reduced, and stability and reliability of the battery management system are effectively improved.

Description

Technical Field

[0001] This application relates to the technical field of batteries, and particularly to a battery management system. Background Art

[0002] A Battery Management System (BMS) is used to intelligently manage and maintain each battery cell, monitor the state of the battery, and prevent the battery from overcharging and over-discharging, so as to extend the service life of the battery.

[0003] In related technologies, when using a battery management system to visually monitor a battery, the battery management system needs to be connected to a host computer via a data cable to achieve this, resulting in the inability to remotely visually monitor the battery. Summary of the Utility Model

[0004] Aiming at the deficiencies of the prior art, this application provides a battery management system, aiming to solve the technical problem in the prior art that remote visual monitoring of the battery cannot be achieved.

[0005] To solve the above problems, this application provides a battery management system, which includes:

[0006] A main control module configured to manage and control the battery management system;

[0007] A communication isolation module, one end of which is electrically connected to the main control module;

[0008] A wireless module electrically connected to the other end of the communication isolation module, and the wireless module is configured to perform wireless communication with the outside of the battery management system.

[0009] Further, in the battery management system, the battery management system further includes a first power supply switch;

[0010] Wherein, the control end of the first power supply switch is electrically connected to the main control module, the first end of the first power supply switch is electrically connected to the wireless module, and the second end of the first power supply switch is connected to a first voltage source; the first power supply switch is configured to control the power supply of the wireless module.

[0011] Even further, in the battery management system, the first power supply switch includes:

[0012] A first MOS transistor, the gate of which is electrically connected to the main control module, and the source of which is grounded;

[0013] A second MOS transistor, the gate of the second MOS transistor being electrically connected to the drain of the first MOS transistor, the source of the second MOS transistor being electrically connected to the wireless module and connected to the first voltage source;

[0014] A buffer power resistor, one end of the buffer power resistor being electrically connected to the drain of the second MOS transistor, and the other end of the buffer power resistor being electrically connected to the source of the second MOS transistor and the wireless module respectively.

[0015] Further, in the battery management system, the communication isolation module includes:

[0016] A first diode, the negative electrode of the first diode being electrically connected to the wireless module, the positive electrode of the first diode being electrically connected to the main control module and connected to the second voltage source;

[0017] A third MOS transistor, the gate of the third MOS transistor being connected to the third voltage source, the drain of the third MOS transistor being electrically connected to the wireless module, and the source of the third MOS transistor being electrically connected to the main control module;

[0018] A second diode, the negative electrode of the second diode being electrically connected to the wireless module and the drain of the third MOS transistor respectively, and the positive electrode of the second diode being connected to the fourth voltage source.

[0019] Further, in the battery management system, the battery management system further includes a battery monitoring module;

[0020] Wherein, the battery monitoring module is electrically connected to the main control module, and the battery monitoring module is configured to monitor the battery.

[0021] Even further, in the battery management system, the battery management system further includes a charge and discharge switch;

[0022] Wherein, the control end of the charge and discharge switch is electrically connected to the battery monitoring module, the first end of the charge and discharge switch is electrically connected to the battery, the second end of the charge and discharge switch is electrically connected to the charge and discharge interface of the battery, and the charge and discharge switch is configured to control the charge and discharge of the battery.

[0023] Even further, in the battery management system, the charge and discharge switch includes:

[0024] A fourth MOS transistor, the gate of the fourth MOS transistor being electrically connected to the battery monitoring module, the drain of the fourth MOS transistor being electrically connected to the battery, and the source of the fourth MOS transistor being electrically connected to the negative output of the charge and discharge interface;

[0025] The fifth MOS transistor, the gate of the fifth MOS transistor is electrically connected to the battery monitoring module, the source of the fifth MOS transistor is electrically connected to the negative output of the charge and discharge interface, and the drain of the fifth MOS transistor is electrically connected to the negative charge of the charge and discharge interface;

[0026] The sixth MOS transistor, the gate of the sixth MOS transistor is electrically connected to the battery monitoring module, the source of the sixth MOS transistor is electrically connected to the negative output of the charge and discharge interface, and the drain of the sixth MOS transistor is electrically connected to the negative charge of the charge and discharge interface.

[0027] Furthermore, in the battery management system, the battery management system further includes a second power supply switch;

[0028] Wherein, the control end of the second power supply switch is electrically connected to the battery monitoring module, the first end of the second power supply switch is electrically connected to the battery, the second end of the second power supply switch is electrically connected to the main control module, and the second power supply switch is configured to control the power supply of the main control module.

[0029] Furthermore, in the battery management system, the second power supply switch includes a seventh MOS transistor;

[0030] Wherein, the gate of the seventh MOS transistor is electrically connected to the battery monitoring module, the drain of the seventh MOS transistor is electrically connected to the positive battery terminal, and the source of the seventh MOS transistor is electrically connected to the main control module.

[0031] Further, in the battery management system, the battery management system further includes:

[0032] A storage circuit, the storage circuit includes a memory and a clock circuit, both the memory and the clock circuit are electrically connected to the main control module, the memory is configured to store the monitoring data of the battery, and the clock circuit is configured to provide a clock signal.

[0033] The battery management system provided by the present application can remotely obtain the status information of the battery where the battery management system is located by setting a wireless module that can communicate wirelessly with the outside of the battery management system at the main control module, thereby realizing remote monitoring of the battery. At the same time, a communication isolation module is set between the main control module and the wireless module, which can effectively reduce the interference of the outside world on the battery management system, thereby improving the stability and reliability of the battery management system. Description of the Drawings

[0034] To more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the accompanying drawings required for the description of the embodiments. Obviously, the accompanying drawings in the following description are some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can also be obtained based on these drawings.

[0035] Figure 1 Schematic block diagram of the battery management system provided by the embodiment of the present application;

[0036] Figure 2 Circuit diagram of the battery management system provided by the embodiment of the present application;

[0037] Figure 3 Circuit diagram of the first power supply switch provided by the embodiment of the present application. Detailed implementation manners

[0038] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the protection scope of the present invention.

[0039] It should be understood that when used in this specification and the appended claims, the terms "comprises" and "comprising" indicate the presence of the described features, wholes, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components, and / or their combinations.

[0040] It should also be understood that the terms used in this specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in this specification of the present invention and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an", and "the" are intended to include the plural forms.

[0041] It should be further understood that the term " / and / " used in this specification of the present invention and the appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0042] Please refer to Figure 1 , Figure 1 Schematic block diagram of the battery management system provided by the embodiment of the present application. As Figure 1 shown, a battery management system includes:

[0043] The main control module 10 is configured to manage and control the battery management system;

[0044] The communication isolation module 40, one end of the communication isolation module 40 is electrically connected to the main control module 10;

[0045] The wireless module 50 is electrically connected to the other end of the communication isolation module 40. The wireless module 50 is configured to perform wireless communication with the outside of the battery management system.

[0046] In this embodiment, the battery management system (Battery Management System, BMS) provided by the present application is a highly integrated battery platform management system, which supports the monitoring and management of the voltage, temperature, humidity, current, etc. of the battery cells. At the same time, the battery management system also has perfect software and hardware protection functions, such as overvoltage and overcurrent protection during charging, undervoltage and overcurrent protection during discharging, high-temperature and low-temperature protection during charging, and high-temperature and low-temperature protection during discharging. At the same time, the battery management system can modify and adjust the lithium battery protection parameters according to the actual situation of the customer, and support the monitoring and management of various types of lithium batteries; the battery management system also has an intermittent passive equalization switch, which can prevent the equalization resistor from overheating. In addition, the battery management system can support both charging equalization and static equalization, and the equalization opening parameters are adjustable.

[0047] The wireless module 50 can be a module with wireless communication such as a GPS (Global Positioning System) module or a Bluetooth module. The main control module 10 is configured to manage and control the battery management system (Battery Management System, BMS), and thus can collect sampling information from each battery, communicate with the whole vehicle through a low-voltage electrical interface, and at the same time control the relay action in the BDU (Battery Disconnect Unit) to monitor various states of the battery, so as to ensure the safe use of the battery during the charging and discharging process.

[0048] At the same time, the main control module 10 can wirelessly transmit all the data information monitored by the battery management system for the battery to the upper computer platform or WeChat applet, so as to realize remote monitoring of the battery. Among them, the battery information that the wireless module 50 can transmit includes data information such as single-cell voltage, total voltage, current, temperature, and humidity, which is convenient for remotely evaluating the battery.

[0049] Specifically, the main control module 10 can be an MCU (Microcontroller Unit) chip, and its model can be GD32F103CCT6. Additionally, after the communication isolation module 40 is arranged between the main control module 10 and the wireless module 50, it can effectively reduce the interference from the outside world to the battery management system, thereby improving the stability and reliability of the battery management system. It should be noted that the communication isolation module 40 can be implemented using an RS-485 interface, that is, the RS-485 interface can be used for connection between the wireless module 50 and the main control module 10.

[0050] For the battery management system provided in this application, by setting a wireless module 50 at the main control module 10 that can communicate wirelessly with the outside of the battery management system, the status information of the battery where the battery management system is located can be remotely obtained, realizing remote monitoring of the battery, and then realizing remote charging and discharging of the battery, realizing the Internet of Things of the battery management system, and realizing the display and recording of the data and trajectory of the battery to form a large database. At the same time, by setting a communication isolation module 40 between the main control module 10 and the wireless module 50, the interference from the outside world to the battery management system can be reduced, effectively improving the stability and reliability of the battery management system.

[0051] In some embodiments, as Figure 2 shown, the battery management system further includes a first power supply switch 70; wherein, the control end of the first power supply switch 70 is electrically connected to the main control module 10, the first end of the first power supply switch 70 is electrically connected to the wireless module 50, and the second end of the first power supply switch 70 is connected to the first voltage source +5V; the first power supply switch 70 is configured to control the power supply of the wireless module 50.

[0052] In this embodiment, the conduction and cut-off of the first power supply switch 70 are controlled by the main control module 10. The main control module 10 controls the conduction and cut-off between the first end and the second end of the first power supply switch 70, thereby realizing the control of the presence or absence of the power supply voltage of the wireless module 50. Furthermore, it can ensure that when the battery management system is in the sleep state, the power supply of the wireless module 50 is cut off to reduce the power consumption of the battery management system.

[0053] Furthermore, in some embodiments, the first power supply switch 70 is further configured to protect against sparking during the plugging and unplugging of the wireless module 50. Specifically, after the first power supply switch 70 is configured to protect against sparking during the plugging and unplugging of the wireless module 50, when the wireless module 50 is plugged and unplugged in the battery management system, the phenomenon of sparking can be avoided, thereby further improving the safety and reliability of the battery management system.

[0054] Furthermore, in some embodiments, as Figure 3As shown in the figure, the first power supply switch 70 includes: a first MOS transistor Q1, a second MOS transistor Q2, and a buffer power resistor R4; wherein, the gate of the first MOS transistor Q1 is electrically connected to the main control module 10, and the source of the first MOS transistor Q1 is grounded; the gate of the second MOS transistor Q2 is electrically connected to the drain of the first MOS transistor Q1, and the source of the second MOS transistor Q2 is electrically connected to the wireless module 50 and is connected to the first voltage source +5V; one end of the buffer power resistor R4 is electrically connected to the drain of the second MOS transistor Q2, and the other end of the buffer power resistor R4 is respectively electrically connected to the source of the second MOS transistor Q2 and the wireless module 50.

[0055] Specifically, the first MOS transistor Q1 and the second MOS transistor Q2 adopted in this application are used to control the presence or absence of the power supply voltage of the wireless module 50. The type of the first MOS transistor Q1 can be P-type. A body diode is provided in the first MOS transistor Q1. The gate and the source of the first MOS transistor Q1 are electrically connected through a resistor R9. At the same time, the gate of the first MOS transistor Q1 is electrically connected to the main control module 10 through a resistor R8. Furthermore, the main control module 10 can input a low-power signal LowPwrShutGPS to the gate of the first MOS transistor Q1, so as to realize controlling the presence or absence of the power supply voltage of the wireless module 50 by controlling the on and off of the first MOS transistor Q1.

[0056] The type of the second MOS transistor Q2 can be PMOS-SOP8, which includes pin 1, pin 2, pin 3, pin 4, pin 5, pin 6, pin 7, and pin 8. Among them, pin 1, pin 2, and pin 3 can be used as the source of the second MOS transistor Q2, pin 4 can be used as the gate of the second MOS transistor Q2, and pin 5, pin 6, pin 7, and pin 8 can be used as the drain of the second MOS transistor Q2.

[0057] Specifically, the source and the drain of the second MOS transistor Q2 are electrically connected through a resistor R6. The gate of the second MOS transistor Q2 is electrically connected to the drain of the first MOS transistor Q1 through a resistor R7. The drain of the second MOS transistor Q2 is connected to the first voltage source +5V through a resistor R5, and the resistor R5 can be a zero-ohm resistor. Among them, the first voltage source +5V can provide 5V voltage for the pin GPS-B of the wireless module 50.

[0058] At the same time, in order to avoid the phenomenon of arcing during the plugging and unplugging of the wireless module 50, a resistor, namely the buffer power resistor R4, can be connected in series between the source and the drain of the second MOS transistor Q2. At the same time, after a resistor is connected in series between the source and the drain of the second MOS transistor Q2, it is electrically connected to the pin GPS-B of the wireless module 50, thereby avoiding the phenomenon of arcing during the plugging and unplugging of the wireless module 50. Among them, the buffer power resistor R4 can be a 100R / 2W wire-wound resistor.

[0059] In some embodiments, such asFigure 2 As shown in the figure, the communication isolation module 40 includes: a first diode D1, a third MOS transistor Q3, and a second diode D2. Among them, the negative electrode of the first diode D1 is electrically connected to the pin GPS-TX of the wireless module 50, the positive electrode of the first diode D1 is electrically connected to the pin MCU-RX of the main control module 10, and is connected to the second voltage source 3V3. The gate of the third MOS transistor Q3 is connected to the third voltage source 3V3, the drain of the third MOS transistor Q3 is electrically connected to the wireless module 50, and the source of the third MOS transistor Q3 is electrically connected to the pin MCU-TX of the main control module 10. The negative electrode of the second diode D2 is electrically connected to the pin GPS-RX of the wireless module 50 and the drain of the third MOS transistor Q3 respectively, and the positive electrode of the second diode D2 is connected to the fourth voltage source 3V3.

[0060] In this embodiment, the first diode D1, the second diode D2, and the third MOS transistor Q3 can achieve communication isolation between the wireless module 50 and the main control module 10, thereby avoiding mutual influence between the wireless module 50 and the main control module 10.

[0061] Specifically, the communication isolation module 40 is electrically connected to the wireless module 50 through a UART interface. The second voltage source 3V3, the third voltage source 3V3, and the fourth voltage source 3V3 can be the same voltage source, and they can all be 3.3V. The positive electrode of the first diode D1 can be electrically connected to the pin TXD of the main control module 10. At the same time, the positive electrode of the first diode D1 is connected to the first voltage source +5V through a resistor R1, and the negative electrode of the first diode D1 is electrically connected to the pin 2 of the UART interface. The negative electrode of the second diode D2 is electrically connected to the pin 3 of the UART interface through a resistor R2. The gate of the third MOS transistor Q3 is connected to the third voltage source 3V3 through a resistor R3. The source of the third MOS transistor Q3 is electrically connected to the pin RXD of the main control module 10, and the pin 1 of the UART interface is grounded.

[0062] In some embodiments, as Figure 1 and Figure 2 shown, the battery management system further includes a battery monitoring module 20. Among them, the battery monitoring module 20 is electrically connected to the main control module 10, and the battery monitoring module 20 is configured to monitor the battery.

[0063] In this embodiment, after the battery monitoring module 20 is configured to monitor the battery, it can monitor information such as the voltage, temperature, and current of the battery and transmit the information to the main control module 10. After receiving the monitoring information of the battery from the battery monitoring module 20, the main control module 10 can perform wireless transmission through the wireless module 50, thereby realizing remote monitoring of the battery. Among them, the battery monitoring module 20 can be a chip of the SH367309 model.

[0064] It should be noted that one or more battery monitoring modules 20 can be set in the battery management system mentioned in this application. The number of battery monitoring modules 20 set can be selected according to actual applications, and this application does not make specific limitations.

[0065] In some embodiments, such as Figure 1 shown, the battery management system further includes a charge and discharge switch 60; wherein, the control end of the charge and discharge switch 60 is electrically connected to the battery monitoring module 20, the first end of the charge and discharge switch 60 is electrically connected to the battery, the second end of the charge and discharge switch 60 is electrically connected to the charge and discharge interface of the battery, and the charge and discharge switch 60 is configured to control the charge and discharge of the battery.

[0066] In this embodiment, the conduction and cut-off between the first end and the second end of the charge and discharge switch 60 can be controlled by the battery monitoring module 20, so that the charge and discharge switch 60 can be configured to control the charge and discharge of the battery, thereby realizing the charging and discharging of the battery. At the same time, when the battery management system is in the sleep state, the charge and discharge switch 60 can be configured to be turned off.

[0067] Furthermore, in some embodiments, such as Figure 2 shown, the charge and discharge switch 60 includes: a fourth MOS transistor Q4, a fifth MOS transistor Q5, and a sixth MOS transistor Q6; wherein, the gate of the fourth MOS transistor Q4 is electrically connected to the battery monitoring module 20, the drain of the fourth MOS transistor Q4 is electrically connected to the battery, and the source of the fourth MOS transistor Q4 is electrically connected to the output negative pole P- of the charge and discharge interface; the gate of the fifth MOS transistor Q5 is electrically connected to the battery monitoring module 20, the source of the fifth MOS transistor Q5 is electrically connected to the output negative pole P- of the charge and discharge interface, and the drain of the fifth MOS transistor Q5 is electrically connected to the charging negative pole C- of the charge and discharge interface; the gate of the sixth MOS transistor Q6 is electrically connected to the battery monitoring module 20, the source of the sixth MOS transistor Q6 is electrically connected to the output negative pole P- of the charge and discharge interface, and the drain of the sixth MOS transistor Q6 is electrically connected to the charging negative pole C- of the charge and discharge interface.

[0068] In this embodiment, the fourth MOS transistor Q4, the fifth MOS transistor Q5, and the sixth MOS transistor Q6 are arranged at the battery negative pole B-. The fourth MOS transistor Q4, the fifth MOS transistor Q5, and the sixth MOS transistor Q6 can all be P-type MOS transistors. The pin DSG of the battery monitoring module 20 is electrically connected to the gate of the fourth MOS transistor Q4, the pin CHG of the battery monitoring module 20 is electrically connected to the gate of the fifth MOS transistor Q5, and the pin PCHG of the battery monitoring module 20 is electrically connected to the gate of the sixth MOS transistor Q6.

[0069] Furthermore, in some embodiments, such as Figure 1 and Figure 2As shown, the battery management system further includes a second power supply switch 80. Among them, the control end of the second power supply switch 80 is electrically connected to the battery monitoring module 20, the first end of the second power supply switch 80 is electrically connected to the battery, the second end of the second power supply switch 80 is electrically connected to the main control module 10, and the second power supply switch 80 is configured to control the power supply of the main control module 10.

[0070] In this embodiment, the conduction and cut-off between the first end and the second end of the second power supply switch 80 are controlled by the battery monitoring module 20, so that the second power supply switch 80 can be configured to control the power supply of the main control module 10, and thus the main control module 10 can be cut off.

[0071] Continue to refer to Figure 2 , in some embodiments, the second power supply switch 80 includes a seventh MOS transistor Q7. The gate of the seventh MOS transistor Q7 is electrically connected to pin 1 of the battery monitoring module 20. The drain of the MOS transistor Q7 is electrically connected to the battery positive electrode B+. It is arranged between the battery positive electrode B+ and the output positive electrode P+. The source of the MOS transistor Q7 is electrically connected to pin VDD of the main control module 10. Pin ALARM of the battery monitoring module 20 is electrically connected to pin INTO of the main control module 10. Pin SDA of the battery monitoring module 20 is electrically connected to pin P3.1 of the main control module 10. Pin SCL of the battery monitoring module 20 is electrically connected to pin 3.0 of the main control module 10. Pins RS1, RS2 and pin VC1 of the battery monitoring module 20 are electrically connected to the battery negative electrode B-. Pin VBAT of the battery monitoring module 20 is electrically connected to the battery positive electrode B+. Pins T1-3 of the battery monitoring module 20 are grounded through RTC resistors.

[0072] In some embodiments, such as Figure 1 and Figure 2 As shown, the battery management system further includes: a storage circuit 30. The storage circuit 30 includes a memory 31 and a clock circuit 32. Both the memory 31 and the clock circuit 32 are electrically connected to the main control module 10. The memory 31 is configured to store the monitoring data of the battery, and the clock circuit 32 is configured to provide a clock signal.

[0073] In this embodiment, the memory 31 can be an EEPROM (Electrically Erasable Programmable Read Only Memory), and the clock circuit 32 can be a clock (RTC, Real Time Clock) chip. The memory 31 is configured to store the monitoring data of the battery, and the clock circuit 32 is configured to provide an accurate clock signal for the battery management system. Among them, both the memory 31 and the clock circuit 32 are electrically connected to the battery monitoring module 20 and the main control module 10.

[0074] As described above, it is only the specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present application can easily think of various equivalent modifications or substitutions, and these modifications or substitutions should be covered within the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A battery management system, characterized in that: include: A main control module, wherein the main control module is configured to manage and control the battery management system; A communication isolation module, one end of which is electrically connected to the main control module; A wireless module is electrically connected to the other end of the communication isolation module, and the wireless module is configured to perform wireless communication with the outside of the battery management system.

2. The battery management system according to claim 1, characterized in that: The battery management system further includes a first power switch; Among them, the control end of the first power switch is electrically connected to the main control module, the first end of the first power switch is electrically connected to the wireless module, and the second end of the first power switch is connected to a first voltage source; the first power switch is configured to control the power supply of the wireless module.

3. The battery management system according to claim 2, characterized in that: The first power switch comprises: A first MOS transistor, wherein a gate of the first MOS transistor is electrically connected to the main control module, and a source of the first MOS transistor is grounded; a second MOS transistor, wherein a gate of the second MOS transistor is electrically connected to a drain of the first MOS transistor, and a source of the second MOS transistor is electrically connected to the wireless module and connected to the first voltage source; A buffer power resistor, one end of which is electrically connected to the drain of the second MOS tube, and the other end of which is electrically connected to the source of the second MOS tube and the wireless module respectively.

4. The battery management system according to any one of claims 1 to 3, characterized in that: The communication isolation module comprises: a first diode, wherein a cathode of the first diode is electrically connected to the wireless module, and an anode of the first diode is electrically connected to the main control module and connected to a second voltage source; a third MOS tube, wherein the gate of the third MOS tube is connected to a third voltage source, the drain of the third MOS tube is electrically connected to the wireless module, and the source of the third MOS tube is electrically connected to the main control module; A second diode, wherein a cathode of the second diode is electrically connected to the drain of the wireless module and the drain of the third MOS tube respectively, and an anode of the second diode is connected to a fourth voltage source.

5. The battery management system according to any one of claims 1 to 3, characterized in that: The battery management system also includes a battery monitoring module; Wherein, the battery monitoring module is electrically connected to the main control module, and the battery monitoring module is configured to monitor the battery.

6. The battery management system according to claim 5, characterized in that: The battery management system also includes a charge and discharge switch; Among them, the control end of the charge and discharge switch is electrically connected to the battery monitoring module, the first end of the charge and discharge switch is electrically connected to the battery, the second end of the charge and discharge switch is electrically connected to the charge and discharge interface of the battery, and the charge and discharge switch is configured to control the charge and discharge of the battery.

7. The battery management system according to claim 6, characterized in that: The charge and discharge switch comprises: a fourth MOS tube, wherein the gate of the fourth MOS tube is electrically connected to the battery monitoring module, the drain of the fourth MOS tube is electrically connected to the battery, and the source of the fourth MOS tube is electrically connected to the output negative electrode of the charge and discharge interface; a fifth MOS tube, wherein the gate of the fifth MOS tube is electrically connected to the battery monitoring module, the source of the fifth MOS tube is electrically connected to the output negative electrode of the charge and discharge interface, and the drain of the fifth MOS tube is electrically connected to the charging negative electrode of the charge and discharge interface; A sixth MOS tube, wherein the gate of the sixth MOS tube is electrically connected to the battery monitoring module, the source of the sixth MOS tube is electrically connected to the output negative electrode of the charge and discharge interface, and the drain of the sixth MOS tube is electrically connected to the charging negative electrode of the charge and discharge interface.

8. The battery management system according to claim 5, characterized in that: The battery management system further includes a second power supply switch; Among them, the control end of the second power supply switch is electrically connected to the battery monitoring module, the first end of the second power supply switch is electrically connected to the battery, the second end of the second power supply switch is electrically connected to the main control module, and the second power supply switch is configured to control the power supply of the main control module.

9. The battery management system according to claim 8, characterized in that: The second power switch includes a seventh MOS tube; The gate of the seventh MOS tube is electrically connected to the battery monitoring module, the drain of the seventh MOS tube is electrically connected to the positive electrode of the battery, and the source of the seventh MOS tube is electrically connected to the main control module.

10. The battery management system according to any one of claims 1 to 3, characterized in that: The battery management system further comprises: A storage circuit, the storage circuit includes a memory and a clock circuit, the memory and the clock circuit are both electrically connected to the main control module, the memory is configured to store battery monitoring data, and the clock circuit is configured to provide a clock signal.

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