Battery management system and battery pack

Abstract

The embodiment of the utility model discloses a battery management system and a battery pack. The battery management system comprises a main control module and a latch circuit, the input end of the latch circuit is electrically connected with the output end of the main control module, the output end of the latch circuit is electrically connected with a charging and discharging switch of the battery pack, the latch circuit can be configured in advance, and therefore when the main control module is abnormal, the charging and discharging switch can be kept on or off through the latch circuit, and the charging and discharging switch can be switched off. Therefore, the problem that the vehicle cannot be charged and discharged due to the abnormity of the main control module in the driving process can be avoided, and the safety and the reliability of the battery management system are improved.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery management system and battery pack. Background Technology

[0002] With the growth of the electric vehicle market and technological advancements, 12V lithium batteries have gradually replaced traditional lead-acid batteries, becoming a lighter and higher energy density option. A 12V lithium battery is a power system used in automobiles and other vehicles, primarily for cold starts, powering low-power in-vehicle devices (such as windows and lighting), and serving as an auxiliary power system in hybrid and electric vehicles.

[0003] In related technologies, the battery management system of a 12V lithium battery controls the on / off state of the charge / discharge switch to regulate the charging and discharging of the 12V lithium battery. However, if the main control board of the battery management system malfunctions while the vehicle is in motion, the charge / discharge switch will disconnect, preventing the 12V lithium battery from charging and discharging, thus posing a significant safety risk to the vehicle while it is in motion. Utility Model Content

[0004] To address the shortcomings of existing technologies, this application provides a battery management system and battery pack, aiming to solve the technical problems of poor safety and reliability of existing battery management systems.

[0005] To address the aforementioned problems, in a first aspect, this application provides a battery management system, comprising:

[0006] Main control module;

[0007] The input terminal of the latch circuit is electrically connected to the output terminal of the main control module, and the output terminal of the latch circuit is electrically connected to the charge / discharge switch of the battery pack.

[0008] When the main control module malfunctions, the latch circuit is configured to keep the charge / discharge switch closed or open.

[0009] Furthermore, in the battery management system provided in this application, the output terminal of the main control module includes a first output terminal and a second output terminal, and the input terminal of the latch circuit includes a first input terminal and a second input terminal;

[0010] The first output terminal is electrically connected to the first input terminal, and the second output terminal is electrically connected to the second input terminal.

[0011] When the main control module malfunctions, the first input terminal is configured to receive a first signal, the second input terminal is configured to receive a second signal, and the latching circuit is configured to keep the charge / discharge switch closed or open according to the first and second signals.

[0012] Furthermore, in the battery management system provided in this application, when the main control module malfunctions, both the first signal and the second signal are either high-level signals or low-level signals.

[0013] Furthermore, in the battery management system provided in this application, the output terminal of the main control module also includes a third output terminal, and the input terminal of the latch circuit also includes a third input terminal;

[0014] The third output terminal is electrically connected to the third input terminal, and the third input terminal is configured to receive a third signal.

[0015] The latch circuit is configured to be reset based on the first signal, the second signal, and the third signal.

[0016] Furthermore, in the battery management system provided in this application, the latching circuit also includes a fourth input terminal;

[0017] The fourth input terminal is configured to receive a fourth signal; when the main control module malfunctions, the latch circuit is configured to keep the charge / discharge switch closed or open according to the first, second, third, and fourth signals.

[0018] Furthermore, in the battery management system provided in this application, when the latch circuit is reset, the third signal includes a rising edge signal or a falling edge signal.

[0019] Furthermore, in the battery management system provided in this application, the latching circuit is also configured to control the charge / discharge switch to open or close according to the first signal and the second signal.

[0020] Furthermore, in the battery management system provided in this application, the battery management system also includes a switching circuit;

[0021] The input terminal of the switching circuit is connected to the first power supply, the control terminal of the switching circuit is electrically connected to the output terminal of the main control module, and the output terminal of the switching circuit is electrically connected to the input terminal of the latch circuit.

[0022] When the main control module malfunctions, the switching circuit is configured to be turned on, and the latching circuit is configured to keep the charge / discharge switch closed or open according to the first power supply.

[0023] Furthermore, in the battery management system provided in this application, the switching circuit includes a first switch and a second switch;

[0024] The control terminals of the first switch and the second switch are both electrically connected to the input terminal of the main control module; the input terminals of the first switch and the second switch are both electrically connected to the input terminal of the latch circuit and connected to the first power supply; the output terminals of the first switch and the second switch are both grounded.

[0025] Furthermore, in the battery management system provided in this application, the switching circuit also includes a third switch;

[0026] The control terminal of the third switch is electrically connected to the output terminal of the main control module and connected to the first power supply; the input terminal of the third switch is connected to the first power supply, and the output terminal of the third switch is electrically connected to the input terminal of the latch circuit.

[0027] Furthermore, in the battery management system provided in this application, the battery management system also includes a drive circuit;

[0028] The input terminal of the drive circuit is electrically connected to the output terminal of the latch circuit, and the output terminal of the drive circuit is electrically connected to the charge / discharge switch.

[0029] The drive circuit is configured to control the on / off state of the charge / discharge switch based on the fifth signal output by the latch circuit.

[0030] Furthermore, in the battery management system provided in this application, the charge / discharge switch includes at least a first MOSFET and a second MOSFET, and the output terminal of the drive circuit includes a gate output terminal and a source output terminal;

[0031] The gates of the first MOSFET and the second MOSFET are electrically connected to the gate output terminal, the drain of the first MOSFET is electrically connected to the interface of the battery pack, the drain of the second MOSFET is electrically connected to one end of the battery cell of the battery pack, and the sources of the first MOSFET and the second MOSFET are both electrically connected to the source output terminal.

[0032] Furthermore, in the battery management system provided in this application, the drive circuit also includes a charge pump;

[0033] The charge pump is configured to convert the output voltage of the drive circuit to drive the charge / discharge switch to close or open.

[0034] Secondly, this application also provides a battery pack that includes the battery management system provided in the first aspect.

[0035] The battery management system provided in this application includes a main control module and a latching circuit. The input terminal of the latching circuit is electrically connected to the output terminal of the main control module, and the output terminal of the latching circuit is electrically connected to the charge / discharge switch of the battery pack. The latching circuit can be pre-configured so that when the main control module is abnormal, the charge / discharge switch can be kept closed or open through the latching circuit. This can avoid the problem of the vehicle being unable to charge or discharge due to the abnormality of the main control module during driving, thereby improving the safety and reliability of the battery management system. Attached Figure Description

[0036] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0037] Figure 1 This is a circuit diagram of a battery pack in the prior art;

[0038] Figure 2 This is a first schematic block diagram of a battery management system provided in an embodiment of this application;

[0039] Figure 3 This is a second schematic block diagram of a battery management system provided in an embodiment of this application;

[0040] Figure 4 A third schematic block diagram of a battery management system provided in an embodiment of this application;

[0041] Figure 5 A fourth schematic block diagram of the battery management system provided in an embodiment of this application;

[0042] Figure 6 A fifth schematic block diagram of the battery management system provided in an embodiment of this application;

[0043] Figure 7 A circuit diagram of a battery management system provided in an embodiment of this application. Detailed Implementation

[0044] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0045] It should be understood that, when used in this specification and the appended claims, the terms "comprising" and "including" indicate the presence of the described features, integrals, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or collections thereof.

[0046] It should also be understood that the terms used in this specification are for the purpose of describing specific embodiments only and are not intended to limit the present application. As used in this specification and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms unless the context clearly indicates otherwise.

[0047] It should also be further understood that the term “and / or” as used in this application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0048] Furthermore, in this application, unless otherwise explicitly specified or limited in the embodiments, the terms "installation," "connection," "joining," and "fixing" appearing in the embodiments should be interpreted broadly. For example, a connection can be a fixed connection, a detachable connection, or an integral part; it can also be a mechanical connection, an electrical connection, etc. Of course, it can also be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication between two components, or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific implementation.

[0049] In related technologies, such as Figure 1 As shown, the 12V lithium battery pack includes battery cells, a battery management system, a first interface, and a second interface. The first and second interfaces are the charging and discharging interfaces of the battery pack. A charging / discharging switch is installed between the first interface and the battery cell. The charging / discharging switch can be composed of two back-to-back MOSFETs. The battery management system includes an MCU (Microcontroller Unit) and a drive circuit. The drive circuit generates a voltage that drives the charging / discharging switch based on the drive signal sent by the MCU, thereby controlling the on / off state of the charging / discharging switch. When the vehicle is in motion, the battery pack needs to discharge, and the charging / discharging switch is in the on state. However, if the battery pack experiences a power supply failure or interference while the vehicle is in motion, the battery management system will disconnect the charging / discharging switch, preventing the battery pack from supplying power. This can easily lead to loss of vehicle control, posing a significant safety risk during vehicle operation.

[0050] Therefore, this application provides a battery management system, which includes a main control module and a latching circuit. The input terminal of the latching circuit is electrically connected to the output terminal of the main control module, and the output terminal of the latching circuit is electrically connected to the charge / discharge switch of the battery pack. The latching circuit can be pre-configured so that when the main control module is abnormal, the latching circuit can keep the charge / discharge switch closed or open, thereby avoiding the problem of the vehicle being unable to charge or discharge due to the abnormality of the main control module during driving, and improving the safety and reliability of the battery management system.

[0051] Please see Figure 2 , Figure 2 This is a first schematic block diagram of a battery management system provided in an embodiment of this application. Figure 2 As shown, this application provides a battery management system, which includes:

[0052] Main control module 100;

[0053] The input terminal of the latch circuit 200 is electrically connected to the output terminal of the main control module 100, and the output terminal of the latch circuit 200 is electrically connected to the charge / discharge switch 300 of the battery pack.

[0054] When the main control module 100 malfunctions, the latch circuit 200 is configured to keep the charge / discharge switch 300 closed or open.

[0055] Specifically, a latch circuit 200 is a common component in digital circuits, used to "lock" an input signal at a specific moment and store it at the output. Common latch types include RS latches, D latches, and T latches. RS latches consist of dual NOR elements and can implement both set and reset input functions. D latches control data storage through D inputs.

[0056] In this embodiment, the main control module 100 can be the main control board in the battery management system, i.e., a microcontroller unit (MCU). This application establishes a latch circuit 200 between the main control module 100 and the charge / discharge switch 300. This allows the latch circuit 200 to ensure that the on / off state of the charge / discharge switch 300 remains unchanged when the main control module 100 malfunctions, i.e., when the main control module 100 cannot control the charge / discharge switch 300. This ensures that the battery pack can charge and discharge normally, guaranteeing the vehicle's normal operation and improving the safety and reliability of the battery management system. A malfunction in the main control module 100 can be understood as an overcurrent, short circuit, overtemperature, main control module 100 reset, or program crash of the main control module 100.

[0057] In some embodiments, the output terminals of the main control module 100 include a first output terminal and a second output terminal, and the input terminals of the latch circuit 200 include a first input terminal and a second input terminal; wherein, the first output terminal is electrically connected to the first input terminal, and the second output terminal is electrically connected to the second input terminal; when the main control module 100 malfunctions, the first input terminal is configured to receive a first signal, the second input terminal is configured to receive a second signal, and the latch circuit 200 is configured to keep the charge / discharge switch 300 closed or open according to the first signal and the second signal.

[0058] Specifically, the first output terminal and the second output terminal of the main control module 100 can be respectively Figure 7 The pins MCU_RD and MCU_SD are used in the latch circuit 200, which can be an RS latch U1. The first and second input terminals of the latch circuit 200 can be respectively... Figure 7pins in and pins The first and second signals can be the reset signal and the set signal, respectively. The RS latch U1 also includes pins. Pins VCC and GND are connected. Pin VCC is connected to the first power supply 500V, and pin GND is grounded to GND. The main control module 100 is connected to the third power supply MCU_5V. The RS latch U1 can be a 74LVC2G74DC.

[0059] In this embodiment, when the main control module 100 controls the charge / discharge switch 300 to close via the latch circuit 200, a high-level signal can be output at the MCU_RD pin. After processing, the high-level signal can be sent to the pin as a low-level signal (first signal). At the MCU_SD pin, a low-level signal or a high-impedance signal can be output. After processing, the low-level signal or high-impedance signal can be sent to the pin as a high-level signal (second signal). At this point, the latch circuit 200 can output a high-level signal to close the charge / discharge switch 300.

[0060] When the main control module 100 controls the charge / discharge switch 300 to open via the latch circuit 200, a low-level signal or a high-impedance signal can be output at the MCU_RD pin. After processing, the low-level signal or high-impedance signal can be sent to the pin as a high-level signal (first signal). At the MCU_SD pin, a high-level signal can be output. After processing, this high-level signal can be sent to the pin as a low-level signal (the second signal). At this point, the latch circuit 200 can output a low-level signal to disconnect the charge / discharge switch 300.

[0061] When the main control module 100 malfunctions, the MCU_RD pin can output a low-level signal or a high-impedance signal. After processing, the low-level signal or high-impedance signal can be sent to the pin as a high-level signal (first signal). At the MCU_SD pin, a low-level signal or a high-impedance signal can be output. After processing, the low-level signal or high-impedance signal can be sent to the pin as a high-level signal (second signal). At this point, the latching circuit 200 can output a high-level signal to keep the charge / discharge switch 300 in the closed state.

[0062] Furthermore, in some embodiments, when the main control module 100 malfunctions, both the first signal and the second signal are either high-level signals or low-level signals.

[0063] In this embodiment, when the main control module 100 malfunctions, both the first output terminal and the second output terminal of the main control module 100 output the same level signal, which can both be low level signals. At this time, the first input terminal and the second input terminal of the latch circuit 200 receive the same first signal and second signal respectively, which can both be high level signals or both be low level signals.

[0064] Furthermore, in some embodiments, the output terminal of the main control module 100 further includes a third output terminal, and the input terminal of the latch circuit 200 further includes a third input terminal; wherein, the third output terminal is electrically connected to the third input terminal, and the third input terminal is configured to receive a third signal; the latch circuit 200 is configured to perform a reset based on the first signal, the second signal, and the third signal.

[0065] Specifically, the third output terminal of the main control module 100 can be Figure 7 The pin MCU_CP in the circuit can be used as an RS latch, and the third input of the latch circuit 200 can be... Figure 7 Pin CP is connected to ground (GND) via resistor R7. The third signal can be a clock signal.

[0066] In this embodiment, when the main control module 100 controls the charging and discharging switch 300 to open and close through the latch circuit 200, the third signal can be any value; when the main control module 100 malfunctions, the third signal can be any value; when the latch circuit 200 needs to be reset, the third signal can be a rising edge signal or a falling edge signal, which can trigger the latch circuit 200 to reset.

[0067] Furthermore, in some embodiments, the latch circuit 200 further includes a fourth input terminal; wherein the fourth input terminal is configured to receive a fourth signal; when the main control module 100 malfunctions, the latch circuit 200 is configured to maintain the charging / discharging switch 300 closed or open according to the first signal, the second signal, the third signal and the fourth signal.

[0068] In this embodiment, the latch circuit 200 can be an RS latch, and the fourth input terminal of the latch circuit 200 can be... Figure 7 Pin D in the circuit can be connected to the first power supply 500 via resistor R5. When the main control module 100 malfunctions, the first signal can be a high-level signal, the second signal can be a high-level signal, the third signal can be a low-level signal, and the fourth signal can be a high-level signal, thereby enabling the pins of the latch circuit 200 to... Output a high-level signal to keep the charge / discharge switch 300 in the closed state.

[0069] For example, Figure 7 The signals at each pin can be found in Table 1:

[0070] Table 1. Signals at each pin

[0071]

[0072]

[0073] Where H represents a high level, L represents a low level, X represents any value, ↓ represents a falling edge, ↑ represents a rising edge, and the state remains consistent with the previous state.

[0074] In some embodiments, as Figure 3 As shown, the battery management system also includes a switching circuit 400; wherein, the input terminal of the switching circuit 400 is connected to the first power supply 500, the control terminal of the switching circuit 400 is electrically connected to the output terminal of the main control module 100, and the output terminal of the switching circuit 400 is electrically connected to the input terminal of the latching circuit 200; when the main control module 100 is abnormal, the switching circuit 400 is configured to be turned on, and the latching circuit 200 is configured to keep the charge / discharge switch 300 closed or open according to the first power supply 500.

[0075] In this embodiment, the switching circuit 400 can perform level conversion on the signal output by the main control module 100, thereby enabling the input terminal of the latch circuit 200 to receive the corresponding level signal. Thus, when the main control module 100 is abnormal, the switching circuit 400 is configured to be turned on, and the latch circuit 200 is configured to keep the charge / discharge switch 300 closed or open according to the first power supply 500.

[0076] In some embodiments, as Figure 4 and Figure 7 As shown, the switching circuit 400 includes a first switch 401 and a second switch 402; wherein, the control terminals of the first switch 401 and the second switch 402 are both electrically connected to the input terminals of the main control module 100; the input terminals of the first switch 401 and the second switch 402 are both electrically connected to the input terminals of the latch circuit 200 and connected to the first power supply 500; the output terminals of the first switch 401 and the second switch 402 are both grounded to GND.

[0077] In this embodiment, the first switch 401 is located at pin MCU_SD and pin Between, the second switch 402 is located at pin MCU_RD and pin Between these two switches, the first switch 401 can be transistor Q1, and the second switch 402 can be transistor Q2. The base of transistor Q1 can be electrically connected to the MCU_SD pin, and the base of transistor Q1 is grounded to GND through resistor R1; the collector of transistor Q1 is electrically connected to the MCU_SD pin. Meanwhile, the collector of transistor Q1 is connected to the first power supply 500 through resistor R3; the emitter of transistor Q1 is grounded to GND; the base of transistor Q2 can be electrically connected to the pin MCU_RD, and the base of transistor Q2 is grounded to GND through resistor R2; the collector of transistor Q2 is electrically connected to the pin... Meanwhile, the collector of transistor Q2 is connected to the first power supply 500 through resistor R4; the emitter of transistor Q2 is grounded to GND. The first power supply 500 can be obtained by voltage conversion from the battery pack, and it can be STBY_5V.

[0078] Specifically, when the main control module 100 malfunctions, the MCU_RD pin can output a low-level signal or a high-impedance signal, transistors Q1 and Q2 are both disconnected, and the first and second signals are both high-level signals. At this time, the latch circuit 200 can output a high-level signal to keep the charge / discharge switch 300 in the closed state.

[0079] In some embodiments, as Figure 5 and Figure 7 As shown, the switching circuit 400 also includes a third switch 403; wherein, the control terminal of the third switch 403 is electrically connected to the output terminal of the main control module 100 and connected to the first power supply 500; the input terminal of the third switch 403 is connected to the first power supply 500, and the output terminal of the third switch 403 is electrically connected to the input terminal of the latching circuit 200.

[0080] In this embodiment, the third switch 403 is located between pin MCU_CP and pin CP. The third switch 403 can be a transistor Q3. The base of transistor Q3 is electrically connected to pin MCU_CP, and the base of transistor Q3 is connected to the first power supply 500 through resistor R6. The emitter of transistor Q3 is connected to the first power supply 500, and the collector of transistor Q3 is electrically connected to pin CP.

[0081] In some embodiments, as Figure 6 and Figure 7 As shown, the battery management system also includes a drive circuit 600; wherein, the input terminal of the drive circuit 600 is electrically connected to the output terminal of the latch circuit 200, and the output terminal of the drive circuit 600 is electrically connected to the charge / discharge switch 300; the drive circuit 600 is configured to control the on / off state of the charge / discharge switch 300 according to the fifth signal output by the latch circuit 200.

[0082] In this embodiment, the driving circuit 600 generates a voltage that drives the charge / discharge switch 300 based on the driving signal sent by the MCU, thereby controlling the on / off state of the charge / discharge switch 300. The driving circuit 600 can be a driving chip U2, and its input terminal can be pin IN of the driving chip U2. The driving chip U2 also has a pin VCC, which can be connected to a second power supply STBY_12V, which can be obtained by voltage conversion from the battery pack. The driving chip U2 also has a pin GND, which is used for grounding.

[0083] Furthermore, in some embodiments, the charge / discharge switch 300 includes at least a first MOSFET and a second MOSFET, and the output terminal of the drive circuit 600 includes a gate output terminal and a source output terminal; wherein, the gate of the first MOSFET and the gate of the second MOSFET are electrically connected to the gate output terminal, the drain of the first MOSFET is electrically connected to the interface of the battery pack, the drain of the second MOSFET is electrically connected to one end of the battery cell of the battery pack, and the source of the first MOSFET and the source of the second MOSFET are both electrically connected to the source output terminal.

[0084] In this embodiment, the driving circuit 600 can be a driving chip U2, which is provided with pin G and pin S. The charging and discharging switch 300 can be a set of back-to-back MOS transistors, namely a first MOS transistor and a second MOS transistor. Pin G can be electrically connected to the gate of the MOS transistor, and pin S can be electrically connected to the source of the first MOS transistor and the source of the second MOS transistor.

[0085] Furthermore, in the battery management system provided in this application, the drive circuit 600 also includes a charge pump; wherein the charge pump is configured to convert the output voltage of the drive circuit 600 to drive the charge / discharge switch 300 to close or open.

[0086] In this embodiment, the drive circuit 600 can be composed of a charge pump, and the charge / discharge switch 300 can also be equipped with two sets of back-to-back MOSFETs. At the same time, the drive circuit 600, latch circuit 200 and switch circuit 400 can be integrated, so that the charge / discharge switch 300 can be closed or opened when the main control board of the battery management system malfunctions. This can avoid the problem of the vehicle being unable to charge or discharge due to the malfunction of the main control module 100 during driving, thereby improving the safety and reliability of the battery management system.

[0087] In some embodiments, this application also provides a battery pack that includes the battery management system provided in the above embodiments.

[0088] The battery management system provided in this application includes a main control module 100 and a latching circuit 200. The input terminal of the latching circuit 200 is electrically connected to the output terminal of the main control module 100, and the output terminal of the latching circuit 200 is electrically connected to the charge / discharge switch 300 of the battery pack. The latching circuit 200 can be pre-configured so that when the main control module 100 is abnormal, the latching circuit 200 can keep the charge / discharge switch 300 closed or open, thereby avoiding the problem of the vehicle being unable to charge or discharge due to the abnormality of the main control module 100 during driving, and improving the safety and reliability of the battery management system.

[0089] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this application, and these modifications or substitutions should all be covered within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A battery management system, characterized in that, include: Main control module; A latching circuit, wherein the input terminal of the latching circuit is electrically connected to the output terminal of the main control module, and the output terminal of the latching circuit is electrically connected to the charge / discharge switch of the battery pack; When the main control module malfunctions, the latching circuit is configured to keep the charge / discharge switch closed or open.

2. The battery management system according to claim 1, characterized in that, The output terminals of the main control module include a first output terminal and a second output terminal, and the input terminals of the latch circuit include a first input terminal and a second input terminal. Wherein, the first output terminal is electrically connected to the first input terminal, and the second output terminal is electrically connected to the second input terminal; When the main control module malfunctions, the first input terminal is configured to receive a first signal, the second input terminal is configured to receive a second signal, and the latch circuit is configured to keep the charge / discharge switch closed or open according to the first signal and the second signal.

3. The battery management system according to claim 2, characterized in that, When the main control module malfunctions, both the first signal and the second signal are either high-level or low-level signals.

4. The battery management system according to claim 2, characterized in that, The output terminal of the main control module also includes a third output terminal, and the input terminal of the latch circuit also includes a third input terminal; The third output terminal is electrically connected to the third input terminal, and the third input terminal is configured to receive a third signal; The latch circuit is configured to be reset according to the first signal, the second signal and the third signal.

5. The battery management system according to claim 4, characterized in that, The latching circuit also includes a fourth input terminal; The fourth input terminal is configured to receive a fourth signal; when the main control module malfunctions, the latch circuit is configured to keep the charge / discharge switch closed or open according to the first signal, the second signal, the third signal and the fourth signal.

6. The battery management system according to claim 4, characterized in that, When the latch circuit is reset, the third signal includes a rising edge signal or a falling edge signal.

7. The battery management system according to any one of claims 1-6, characterized in that, The latching circuit is further configured to control the charge / discharge switch to open or close based on a first signal received at a first input terminal of the latching circuit and a second signal received at a second input terminal of the latching circuit.

8. The battery management system according to any one of claims 1-6, characterized in that, The system also includes a switching circuit; The input terminal of the switching circuit is connected to the first power supply, the control terminal of the switching circuit is electrically connected to the output terminal of the main control module, and the output terminal of the switching circuit is electrically connected to the input terminal of the latch circuit. When the main control module malfunctions, the switching circuit is configured to be turned on, and the latching circuit is configured to keep the charge / discharge switch closed or open according to the first power supply.

9. The battery management system according to claim 8, characterized in that, The switching circuit includes a first switch and a second switch; The control terminals of the first switch and the second switch are both electrically connected to the input terminal of the main control module; the input terminals of the first switch and the second switch are both electrically connected to the input terminal of the latch circuit and connected to the first power supply; the output terminals of the first switch and the second switch are both grounded.

10. The battery management system according to claim 9, characterized in that, The switching circuit also includes a third switch; The control terminal of the third switch is electrically connected to the output terminal of the main control module and connected to the first power supply; the input terminal of the third switch is connected to the first power supply, and the output terminal of the third switch is electrically connected to the input terminal of the latch circuit.

11. The battery management system according to any one of claims 1-6, characterized in that, The system also includes a drive circuit; The input terminal of the driving circuit is electrically connected to the output terminal of the latching circuit, and the output terminal of the driving circuit is electrically connected to the charge / discharge switch. The drive circuit is configured to control the on / off state of the charge / discharge switch according to the fifth signal output by the latch circuit.

12. The battery management system according to claim 11, characterized in that, The charge / discharge switch includes at least a first MOS transistor and a second MOS transistor, and the output terminal of the driving circuit includes a gate output terminal and a source output terminal. The gates of the first MOSFET and the second MOSFET are electrically connected to the gate output terminal, the drain of the first MOSFET is electrically connected to the interface of the battery pack, the drain of the second MOSFET is electrically connected to one end of the battery cell of the battery pack, and the sources of the first MOSFET and the second MOSFET are both electrically connected to the source output terminal.

13. The battery management system according to claim 11, characterized in that, The driving circuit also includes a charge pump; The charge pump is configured to convert the output voltage of the drive circuit to drive the charge / discharge switch to close or open.

14. A battery pack, characterized in that, The battery management system includes any one of claims 1-13.

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