Circuit, battery management system, and electric vehicle

Abstract

Provided in the present application are a circuit, a battery management system, and an electric vehicle. The circuit comprises: a first current collection module, a second current collection module and a calculation module, wherein the first current collection module and the second current collection module are respectively connected in series to a main loop and control loop of the battery management system; and the calculation module calculates an SOC value of the battery management system on the basis of first current information collected by the first current collection module and second current information collected by the second current collection module.

Description

Circuits, battery management systems, and electric vehicles

[0001] This application claims priority to Chinese patent applications filed with the China Patent Office on August 25, 2023, with application numbers 202322305685.8, 202322305751.1, 202311084408.7, 202322305827.0, and 202311087750.2. The entire contents of the above applications are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of battery technology, and in particular to a circuit, a battery management system and an electric vehicle. Background Art

[0003] SOC (State of Charge) refers to the remaining capacity of a battery, and its measurement accuracy is a key indicator for battery management systems. Battery management systems use the ampere-hour integration method to calculate the accumulated charge, and this method is widely used in power batteries and energy storage batteries. SUMMARY OF THE INVENTION

[0004] In related technologies, battery management systems (such as 12V low-voltage lithium battery systems) use the ampere-hour integration method to detect SOC. This method only records the power input and output of the battery externally, ignoring changes in the battery management system's internal state. The electronic components within the battery management system also draw power from the battery itself. Although the current is very small, the accumulation of power over time can affect the accuracy of the battery management system's SOC detection.

[0005] In a first aspect, the present application provides an SOC detection circuit for a battery management system, comprising:

[0006] A first current acquisition module is connected in series to a main circuit of the battery management system and is configured to acquire first current information of the main circuit;

[0007] a second current acquisition module, connected in series to the control loop of the battery management system and configured to acquire second current information of the control loop;

[0008] The calculation module is connected to the first current acquisition module and the second current acquisition module respectively, and is configured to calculate the SOC value of the battery management system according to the first current information and the second current information.

[0009] In a second aspect, the present application further provides a charge and discharge control circuit, comprising:

[0010] a calculation module configured to generate a first control signal and a second control signal in response to an operation instruction of a target user;

[0011] a charging control module connected to the calculation module and configured to generate a charging control voltage in response to a first control signal;

[0012] a discharge control module connected to the calculation module and configured to generate a discharge control voltage in response to a second control signal;

[0013] Among them, the charging control voltage is configured to control the charging switch tube to be turned on or off; the discharging control voltage is configured to control the discharging switch tube to be turned on or off.

[0014] In a third aspect, the present application further provides a boost control circuit, comprising:

[0015] a calculation module configured to generate a first control signal and a second control signal in response to an operation instruction of a target user;

[0016] a driving module connected to the computing module and the first power supply terminal, the driving module being configured to generate a switch control signal and a first voltage driving signal in response to the first control signal and the second control signal;

[0017] a switch module connected to the second power supply terminal and the driving module, the switch module being configured to be turned on or off in response to a switch control signal;

[0018] a boost module connected to the switch module and the drive module, the boost module being configured to receive the second power signal from the second power terminal when the switch module is turned on, and to boost the voltage according to the second power signal and the first voltage drive signal to output a second voltage signal;

[0019] The amplitude of the second voltage signal is greater than the amplitude of the second power signal.

[0020] In a fourth aspect, the present application further provides a switch tube detection circuit for a battery management system, the battery management system comprising: a battery, a charging switch module, a discharging switch module, and a charging and discharging interface; the charging and discharging interface and the charging switch module are connected to a first detection end, the charging switch module and the discharging switch module are connected to a second detection end, and the discharging switch module and the battery are connected to a third detection end;

[0021] The switch tube detection circuit of the battery management system includes:

[0022] a calculation module configured to generate a first control signal and a second control signal;

[0023] a first acquisition module connected to the calculation module and the second detection end, the first acquisition module being configured to acquire a second voltage signal from the second detection end according to a first control signal;

[0024] a second acquisition module connected to the calculation module and the first detection terminal and the third detection terminal, the second acquisition module being configured to acquire the first voltage signal of the first detection terminal and the third voltage signal of the third detection terminal according to the second control signal;

[0025] The calculation module is further configured to determine the fault status of the charging switch module and the discharging switch module according to the first voltage signal, the second voltage signal and the third voltage signal.

[0026] In a fifth aspect, the present application also provides a battery management system, including:

[0027] Main circuit;

[0028] control loop;

[0029] The SOC detection circuit of the battery management system mentioned in the first aspect;

[0030] Among them, the SOC detection circuit of the battery management system is connected to the main circuit and the control circuit respectively, and the SOC detection circuit of the battery management system is configured to detect the total SOC value of the main circuit and the control circuit.

[0031] In the sixth aspect, the present application also provides a battery management system, including: the charge and discharge control circuit mentioned in the second aspect, or the boost control circuit mentioned in the third aspect, or the switch tube detection circuit of the battery management system mentioned in the fourth aspect.

[0032] In the seventh aspect, the present application also provides an electric vehicle, comprising: the SOC detection circuit of the battery management system mentioned in the first aspect, or the charge and discharge control circuit mentioned in the second aspect, or the boost control circuit mentioned in the third aspect, or the switch tube detection circuit of the battery management system mentioned in the fourth aspect, or the battery management system mentioned in the third aspect, or the battery management system mentioned in the sixth aspect. Beneficial effects

[0033] The SOC detection circuit of the battery management system provided in the present application collects first current information flowing through the main circuit by connecting a first current acquisition module in series with the main circuit of the battery management system; at the same time, it collects second current information flowing through the control circuit by connecting a second current acquisition module in series with the control circuit, that is, it takes into account the self-consumption power of the control circuit, and calculates the SOC of the battery management system based on the first current information and the second current information through the calculation module, so that the SOC detection circuit of the battery management system calculates the SOC value of the self-consumption power of the control circuit and the power of the main circuit, thereby reducing the error of the SOC detection circuit of the battery management system in calculating the SOC of the battery management system, thereby improving the accuracy of the SOC calculation of the battery management system, and has a simple structure and saves costs.

[0034] The charge and discharge control circuit provided in the present application generates a first control signal and a second control signal by setting a calculation module in response to the operation instructions of the target user, and generates a charge control voltage by setting a charging control module in response to the first control signal, and generates a discharge control voltage by the discharge control module in response to the second control signal. The charge control voltage is configured to control the charge switch tube to be turned on or off, and the discharge control voltage is configured to control the discharge switch tube to be turned on or off. Compared with the circuit that uses relays for charge and discharge control, the volume is reduced.

[0035] The boost control circuit provided in the present application generates a first control signal and a second control signal through a calculation module in response to an operation instruction of a target user, and generates a switch control signal and a first voltage drive signal through a drive module in response to the first control signal and the second control signal. The switch module is connected to the second power supply terminal and the drive module, so that the switch module is turned on or off in response to the switch control signal; when the switch module is turned on, the boost module receives the second power supply signal and boosts the voltage according to the first voltage drive signal and the second power supply signal, outputting a second voltage signal with an amplitude greater than the second power supply signal, so that the second voltage signal output by the output interface of the boost control circuit can meet the drive voltage requirements of the MOS tube that controls the charging and discharging of the battery.

[0036] The switch tube detection circuit of the battery management system provided in the present application respectively collects the voltage signals at both ends of the charging switch module and the discharging switch module by setting a first acquisition module and a second acquisition module. Since there is a conduction voltage drop when the charging switch module and the discharging switch module are turned on, there is a difference between the first voltage signal, the second voltage signal and the third voltage signal. The calculation module determines whether the charging switch module and the discharging switch module are faulty and the type of fault based on the size of the difference between the first voltage signal, the second voltage signal and the third voltage signal, so as to realize fault detection of the switch tube of the battery management system and improve the accuracy of fault diagnosis. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] FIG1 is a structural diagram of a battery management system provided by the present application and connected to an SOC detection circuit of the battery management system.

[0038] FIG2 is a structural diagram of another battery management system provided in the present application connected to an SOC detection circuit of the battery management system.

[0039] FIG3 is a structural diagram of another battery management system provided by the present application and connected to an SOC detection circuit of the battery management system.

[0040] FIG4 is a structural diagram of another battery management system provided by the present application and connected to an SOC detection circuit of the battery management system.

[0041] FIG5 is a structural diagram of another battery management system provided by the present application and connected to the SOC detection circuit of the battery management system.

[0042] FIG6 is a circuit diagram of a battery management system provided by the present application connected to an SOC detection circuit of the battery management system.

[0043] FIG7 is a schematic structural diagram of a charge and discharge control circuit provided in the present application.

[0044] FIG8 is a schematic structural diagram of another charge and discharge control circuit provided in the present application.

[0045] FIG9 is a schematic structural diagram of an electric vehicle provided in this application.

[0046] FIG10 is a schematic structural diagram of a boost control circuit provided in the present application.

[0047] FIG11 is a schematic structural diagram of another boost control circuit provided in the present application.

[0048] FIG12 is a schematic structural diagram of an electric vehicle provided in this application.

[0049] FIG13 is a structural diagram of the connection between a switch tube detection circuit of a battery management system provided in the present application and the battery management system.

[0050] FIG14 is a circuit diagram of a switch tube detection circuit connected to a battery in a battery management system provided by the present application.

[0051] FIG15 is a structural diagram of the connection between the switch tube detection circuit of another battery management system provided in the present application and the battery management system.

[0052] FIG16 is a circuit diagram of another battery management system provided by the present application, showing the connection between the switch tube detection circuit and the battery. Modes for Carrying Out the Invention

[0053] In the description of this application, unless otherwise clearly specified and limited, the terms "connected", "connected" and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements.

[0054] In this application, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or the first and second features being in contact not directly but through another feature between them. Furthermore, a first feature being "above," "above," and "above" a second feature includes the first feature being directly above and obliquely above the second feature, with the first feature having a higher horizontal height than the second feature. A first feature being "below," "below," and "below" a second feature includes the first feature being directly below and obliquely below the second feature, with the first feature having a lower horizontal height than the second feature.

[0055] In the description of this application, terms such as "upper," "lower," "left," "right," "front," and "back" are used to refer to positions or locations based on the positions or locations shown in the accompanying drawings. These terms are intended to facilitate description and simplify operation, and are not intended to indicate or imply that the devices or components referred to must have, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and do not have any special meanings.

[0056] Please refer to Figure 1, which is a schematic diagram of the connection between a battery management system and the SOC detection circuit of the battery management system provided in this application. As shown in Figure 1, the battery management system includes a main circuit 300 and a control circuit 200, with the main circuit 300 being controlled by the control circuit 200. The SOC detection circuit 100 of the battery management system includes a first current acquisition module 101, a second current acquisition module 102, and a calculation module 103. The first current acquisition module 101 is connected in series with the main circuit 300 and is configured to acquire first current information from the main circuit 300. The second current acquisition module 102 is connected in series with the control circuit 200 and is configured to acquire second current information from the control circuit 200. The calculation module 103 is connected to the first current acquisition module 101 and the second current acquisition module 102 and is configured to calculate the SOC value of the battery management system based on the first and second current information.

[0057] Specifically, the main circuit 300 of the battery management system is connected to a load or a charging power supply. When the battery 303 is charging and discharging, the first current acquisition module 101 acquires current information flowing through the main circuit 300 as first current information.

[0058] For example, when battery 303 is charging, the first current information is negative; when battery 303 is not charging, the first current information is positive. Since the battery management system's control circuit 200 is responsible for controlling the main circuit 300, the control circuit 200 itself consumes power. Therefore, by providing a second current acquisition module 102 connected in series with the battery management system's control circuit 200, the second current acquisition module 102 collects current information flowing through the control circuit 200 as the second current information.

[0059] Some examples of the computing module 103 include, but are not limited to, a single-chip microcontroller (MCU), a central processing unit (CPU), a graphics processing unit (GPU), various dedicated artificial intelligence (AI) computing chips, various computing units that run machine learning model algorithms, a digital signal processor (DSP), and any appropriate processor, controller, microcontroller, etc.

[0060] The first current acquisition module 101 and the second current acquisition module 102 respectively input the first current information and the second current information into the calculation module 103. The calculation module 103 calculates the battery management system's SOC according to a preset calculation rule. The first current acquisition module 101, the second current acquisition module 102, and the calculation module 103 together constitute the battery management system's SOC detection circuit 100. This circuit considers the impact of the control loop 200's self-consumption on the battery management system's SOC calculation, thereby reducing errors in the battery management system's SOC calculation.

[0061] The technical solution of the present application is to connect a first current acquisition module 101 in series with the main circuit 300 of the battery management system to collect the first current information flowing through the main circuit 300; at the same time, connect a second current acquisition module 102 in series with the control circuit 200 to collect the second current information flowing through the control circuit 200, that is, to take into account the self-consumption power of the control circuit 200. The SOC of the battery management system is calculated based on the first current information and the second current information by the calculation module 103. The SOC detection circuit 100 of the battery management system configured in this way calculates the SOC value of the self-consumption power of the control circuit 200 and the power of the main circuit, thereby reducing the error of the SOC detection circuit 100 of the battery management system in calculating the SOC of the battery management system. Therefore, the technical solution provided by the present application improves the accuracy of the SOC calculation of the battery management system, has a simple structure, and saves costs.

[0062] Please refer to Figure 2, which is a circuit diagram of a battery management system provided by this application connected to an SOC detection circuit of the battery management system. Based on various embodiments, the main circuit 300 of the battery management system optionally includes: a first interface 301, a charge and discharge control module 302, and a battery 303 connected in series, with the first interface 301 being configured to connect to a load or a charging power source.

[0063] The first current acquisition module 101 is connected between the first interface 301 and the battery 303 . The first current acquisition module 101 is configured to acquire the current flowing through the load of the main circuit 300 .

[0064] Specifically, when the battery 303 is charging, the first interface 301 is connected to a charging power source, and the charge-discharge control module 302 controls the battery 303 to charge. At this time, the first current acquisition module 101 collects the charging current flowing through the main circuit 300. When the battery 303 is discharging, the first interface 301 is connected to a load, and the charge-discharge control module 302 controls the battery 303 to discharge. At this time, the first current acquisition module 101 collects the discharge current of the main circuit 300 flowing through the load.

[0065] In this embodiment, by disposing the first current acquisition module 101 between the first interface 301 of the main circuit 300 and the battery 303, the current of the main circuit 300 can be acquired when the charge and discharge control module 302 controls the charging and discharging of the battery 303. The acquired first current information can be used to calculate the SOC value. This arrangement has a simple structure and is conducive to improving the accuracy of SOC calculation.

[0066] Please refer to Figure 3, which is a schematic diagram of the structure of another battery management system provided by the present application connected to the SOC detection circuit 100 of the battery management system. Based on the various embodiments, the first current acquisition module 101 optionally includes: a first sampling resistor 1011, a first end of the first sampling resistor 1011 is connected to the first interface 301 and the first sampling terminal 1031 of the calculation module 103, and a second end of the first sampling resistor 1011 is connected to the second terminal of the battery 303 and the second sampling terminal 1032 of the calculation module 103.

[0067] Specifically, when the battery 303 is charging, the first interface 301 is connected to a charging power source, and the charge-discharge control module 302 controls the battery 303 to charge. At this time, the first end of the first sampling resistor 1011 is connected to the charging current, and information about the charging current is collected and input into the first sampling end 1031 of the calculation module 103. The charging current flows from the second end of the first sampling resistor 1011 into the second electrode of the battery 303. When the battery 303 is discharging, the first interface 301 is connected to a load, and the charge-discharge control module 302 controls the battery 303 to discharge. At this time, the second end of the first sampling resistor 1011 is connected to the discharging current, and the discharging current flows from the first end of the first sampling resistor 1011 into the load. The first sampling resistor 1011 collects information about the discharging current and inputs the collected current information into the first sampling end 1031 of the calculation module 103.

[0068] In this embodiment, a first sampling resistor 1011 is provided in the first current acquisition module 101. The two terminals of the first sampling resistor 1011 are connected to the first interface 301 and the second terminal of the battery 303, respectively. This allows the current information of the main circuit 300 to be obtained by sampling the voltage across the first sampling resistor 1011 during charging or discharging of the battery 303, using Ohm's law. The first sampling resistor 1011 is also connected to the calculation module 103, and the collected first current information is input into the calculation module 103 to calculate the SOC value. This configuration simplifies the structure and improves the accuracy of SOC calculation.

[0069] Continuing with FIG3 , based on various embodiments, optionally, the control circuit 200 is connected to the battery 303 of the main circuit 300, and the battery 303 is configured to supply power to the control circuit 200. The second current acquisition module 102 is connected between the ground terminal GND of the control circuit 200 and the second terminal of the battery 303, and the second current acquisition module 102 is configured to acquire the self-consumption current of the control circuit 200.

[0070] Specifically, the battery 303 of the main circuit 300 supplies power to the control circuit 200. The power supply current flows into the control circuit 200, is consumed by the control circuit 200, flows through the ground terminal GND (common signal terminal) for all components in the control circuit 200 and the second current acquisition module 102, and flows to the second terminal of the battery 303. The second current acquisition module 102 can then collect self-consumption current information of the control circuit 200.

[0071] In this embodiment, by disposing the second current acquisition module 102 between the ground terminal GND of the control circuit 200 and the second terminal of the battery 303, the self-consumption current of the control circuit 200 can be acquired. The acquired first current information can be used to calculate the SOC value. This arrangement has a simple structure and is conducive to improving the accuracy of SOC calculation.

[0072] Please refer to Figure 4, which is a schematic diagram of the structure of another battery management system provided in this application connected to the SOC detection circuit of the battery management system. Based on the various embodiments, the second current acquisition module 102 optionally includes: a second sampling resistor 1021, a first end of the second sampling resistor 1021 is connected to the second electrode of the battery 303 and the third sampling terminal 1033 of the calculation module 103, and a second end of the second sampling resistor 1021 is connected to the fourth sampling terminal 1034 of the calculation module 103 and the ground terminal GND.

[0073] Specifically, the self-consumption current of the control loop 200 flows to the second terminal of the second sampling resistor 1021 and the ground terminal GND, which is the common signal for all components in the control loop 200. At this time, the second sampling resistor 1021 collects current information and inputs it to the fourth sampling terminal 1034 of the calculation module 103. After flowing through the second sampling resistor 1021, the self-consumption current of the control loop 200 flows from the first terminal of the second sampling resistor 1021 into the second electrode of the battery 303. At this time, the second sampling resistor 1021 collects current information and inputs it to the third sampling terminal 1033 of the calculation module 103.

[0074] In this embodiment, a second sampling resistor 1021 is provided in the second current acquisition module 102. The two terminals of the second sampling resistor 1021 are connected to the ground terminal GND of the control circuit 200 and the second terminal of the battery 303, respectively. By collecting the voltage across the second sampling resistor 1021, Ohm's law can be used to obtain the self-consumption current information of the control circuit 200. The second sampling resistor 1021 is also connected to the calculation module 103, and the collected second current information is input into the calculation module 103 to calculate the SOC value. This configuration simplifies the structure and improves the accuracy of SOC calculation.

[0075] Please refer to Figure 5, which is a schematic diagram of the connection between another battery management system and the SOC detection circuit of the battery management system provided by the present application. Based on various embodiments, the calculation module 103 optionally includes: an analog-to-digital conversion unit 1035 and a signal processing unit 1036.

[0076] The analog-to-digital conversion unit 1035 is connected to the first current acquisition module 101 and the second current acquisition module 102 . The analog-to-digital conversion unit 1035 is configured to convert the first current information and the second current information into digital signals.

[0077] The signal processing unit 1036 is connected to the analog-to-digital conversion unit 1035 , and the signal processing unit 1036 is configured to calculate the SOC value of the battery management system according to the first current information and the second current information converted into digital signals.

[0078] Specifically, since the first and second current information collected by the first and second current acquisition modules 101 and 102 are analog signals and cannot be directly calculated, the first and second current information are converted into digital signals by the analog-to-digital conversion unit 1035. The converted first and second current information are input into the signal processing unit 1036, which calculates the SOC value of the battery management system.

[0079] For example, the signal processing unit 1036 can implement a method for calculating the SOC value of the battery management system based on the ampere-hour integration method. The principle is: the relative change in the battery 303's power is calculated by the ratio of the continuous integration of the current over a period of time to the rated capacity of the battery 303, and then the current SOC value is calculated using the initial SOC value. For example, the mathematical expression is:

[0080]

[0081] Where SOC(t) is the SOC value of the battery management system. SOC(t0) is the initial SOC value determined based on the open circuit voltage. CN is the rated capacity of battery 303, η is the coulombic efficiency, I is the current consumed by the battery system, which in the prior art is the current information of the main circuit 300, and t is time.

[0082] Since the current information consumed by the battery system includes the current information flowing through the main circuit 300 (i.e., the first current information) and the power consumption current information of the control circuit 200 (i.e., the second current information), illustratively, the signal processing unit 1036 can calculate the SOC value of the battery management system based on formula (1), where I is the sum of the first current information and the second current information. This calculation can be implemented using an existing program algorithm. It should be noted that the SOC detection circuit of the battery management system provided in this application can be configured to execute other existing SOC calculation methods to calculate the SOC of the battery management system.

[0083] The Coulomb efficiency, or discharge efficiency, refers to the ratio of the discharge capacity of the battery 303 to the charge capacity during the same cycle, that is, the percentage of the discharge capacity to the charge capacity.

[0084] In this embodiment, by setting an analog-to-digital conversion unit 1035 and a signal processing unit 1036 in the calculation module 103, the first current information and the second current information are converted into digital signals to calculate the SOC value of the battery management system, which is conducive to making the SOC calculation of the battery management system more accurate.

[0085] The present application also provides a battery management system, including: a main circuit 300, a control circuit 200 and the SOC detection circuit 100 of the battery management system provided in any embodiment of the present application.

[0086] The SOC detection circuit 100 of the battery management system is connected to the main circuit 300 and the control circuit 200 respectively. The SOC detection circuit 100 of the battery management system is configured to detect the total SOC value of the main circuit 300 and the control circuit 200 .

[0087] Please refer to Figure 6, which is a circuit diagram of a battery management system provided by this application connected to an SOC detection circuit of the battery management system. Based on various embodiments, the main circuit 300 optionally includes: a first interface 301, a charge and discharge control module 302, and a battery 303 connected in series, and the first interface 301 is configured to connect to a load or a charging power source.

[0088] The control circuit 200 includes a control module 201 and a switch driver module 202. The control module 201 is connected to the switch driver module 202. The switch driver module 202 is configured to generate a drive signal based on a control signal from the control module 201. The drive signal is configured to control the charge and discharge control module 302 to turn on or off. The control module 201 is connected to a battery 303, which is configured to supply power to the control module 201.

[0089] Optionally, the control circuit 200 further includes a freewheeling control circuit 203, an adoption circuit 204, a pack diagnostic circuit 205, a power supply circuit 206, a boost circuit 207, an analog front-end (AFE) 208, a buck circuit 209, and a CAN communication module 210. The charge-discharge control module 302 further includes a first switch Qn3, a second switch Qn1, a third switch Qn4, a fourth switch Qn2, a resistor Rn1, and a resistor Rn2.

[0090] Specifically, when the battery 303 is charging, the first interface 301 is connected to a charging power source, and the battery 303 supplies power to the control module 201. The control module 201 controls the switch driver module 202 to generate a drive signal. This drive signal turns on the charging control module in the charge-discharge control module 302, controlling the battery 303 to charge. At this time, the first current acquisition module 101 collects the charging current flowing through the main circuit 300. When the battery 303 is discharging, the first interface 301 is connected to a load, and the battery 303 supplies power to the control module 201. The control module 201 controls the switch driver module 202 to generate a drive signal. This drive signal turns on the discharge control module in the charge-discharge control module 302, controlling the battery 303 to discharge. At this time, the first current acquisition module 101 collects the discharge current flowing through the load in the main circuit 300.

[0091] The technical solution provided by this application achieves SOC calculation for the battery management system by providing a control module 201 and a switch driver module 202 within the control circuit 200 of the battery management system to control the charging and discharging of the battery 303. This solution, in conjunction with the SOC detection circuit 100 of the battery management system, improves the accuracy of the SOC calculation of the battery management system, and has a simple structure and saves costs.

[0092] The present application also provides an electric vehicle, which includes: the SOC detection circuit 100 of the battery management system provided in any embodiment, or includes: the battery management system provided in any embodiment.

[0093] The present application also provides an electric vehicle having an SOC detection circuit or a battery management system of the battery management system provided in any embodiment of the present application.

[0094] In the prior art, a BMS (Battery Management System) for a 12V low-voltage lithium battery in an automobile requires a switch in the main circuit to control battery charging and discharging. For ease of control, existing charge and discharge control switches typically use relays. However, compared to MOSFETs, relays have a shorter switch life and larger dimensions.

[0095] To this end, in some implementations, the present application provides a charge and discharge control circuit.

[0096] Please refer to Figure 7, which is a schematic diagram of the structure of a charge and discharge control circuit provided by this application. As shown in Figure 7, the charge and discharge control circuit provided by this application includes: a charging control module 105, a discharging control module 106, and a calculation module 103; the calculation module 103 is configured to generate a first control signal and a second control signal in response to an operation instruction of a target user; the charging control module 105 is connected to the calculation module 103 and is configured to generate a charging control voltage in response to the first control signal; the discharging control module 106 is connected to the calculation module 103 and is configured to generate a discharging control voltage in response to the second control signal; wherein the charging control voltage is configured to control the charging switch tube M1 to be turned on or off; and the discharging control voltage is configured to control the discharging switch tube M2 to be turned on or off.

[0097] Specifically, the computing module 103 may be a single-chip microcomputer or other controller capable of controlling or computing functions. The target user's operating instructions may include inserting the charging gun into the charging station and activating the charging button. Alternatively, the target user's configured operating instructions may include starting the electric vehicle.

[0098] The calculation module 103 can generate a first control signal and a second control signal based on the target user's operation instruction. The first control signal can be a control signal that controls the charging control module 105 to conduct and output a charging control voltage. The charging control voltage is configured to control the charging switch tube M1 to conduct, so that the power supply connected through the charging switch tube M1 is connected to the battery to be charged, thereby enabling the power supply to charge the battery to be charged.

[0099] The second control signal may be a control signal that controls the discharge control module 106 to conduct and output a discharge control voltage. The discharge control voltage is configured to control the discharge switch tube M2 to conduct, thereby connecting the battery and the load via the discharge switch tube M2, thereby enabling the battery to output electrical energy to the load.

[0100] The charge and discharge control circuit provided in the present application generates a first control signal and a second control signal by setting a calculation module 103 in response to an operation instruction of the target user. And generates a charge control voltage by setting a charge control module 105 in response to the first control signal, and generates a discharge control voltage by a discharge control module 106 in response to the second control signal. The charge control voltage is configured to control the charge switch tube M1 to be turned on or off, and the discharge control voltage is configured to control the discharge switch tube M2 to be turned on or off. The charge and discharge control circuit provided in the present application is configured to control the charge switch tube M1 and the discharge switch tube M2, and has a smaller size than the circuit using relays for charge and discharge control. The charge and discharge control circuit provided in the present application realizes independent control of charging and discharging, avoiding the large size of the charge and discharge control circuit.

[0101] Please refer to Figure 8, which is a schematic diagram of the structure of another charge and discharge control circuit provided by the present application. Based on the embodiment, in combination with Figures 7 and 8, the charge control module 105 of the charge and discharge control circuit provided by the present application may include: a first follower unit 1051, a first drive unit 1052, a first switch unit 1053 and a first output unit 1054; the first follower unit 1051 is connected to the calculation module 103, and the first follower unit 1051 is configured to receive a first control signal and output the first control signal; the first drive unit 1052 is connected to the first follower unit 1051, and the first drive unit 1052 is configured to turn on according to the first control signal and output a first power signal; the first switch unit 1053 is connected to the first drive unit 1052, and the first switch unit 1053 is configured to turn on according to the first power signal; the first output unit 1054 is connected to the first switch unit 1053, and the first output unit 1054 is configured to output a charge control voltage.

[0102] Specifically, the first follower unit 1051 may include a voltage follower or a trigger. The first follower unit 1051 receives a first control signal, which includes a trigger signal CHANGE & DISCHANGE_CLK and a first control signal CTR_CHARGE_IN. The first follower unit 1051 outputs the received first control signal CTR_CHARGE_IN based on the received trigger signal CHANGE & DISCHANGE_CLK.

[0103] The first drive unit 1052 receives the first control signal CTR_CHARGE_IN output by the first follower unit 1051, and the first drive unit 1052 is turned on and outputs a first power signal. The first power signal is output to the control end of the first switch unit 1053. The first switch unit 1053 is turned on according to the first power signal received at its control end. The first end of the first switch unit 1053 is connected to the second power input end B'+, and the second end of the first switch unit 1053 is grounded. The first output unit 1054 is connected between the second power input end B'+ and the first end of the first switch unit 1053. When the first switch unit 1053 is turned on, the first output unit 1054 divides the second power signal and outputs a charging control voltage.

[0104] Optionally, based on various embodiments, referring to FIG8 , the first driving unit 1052 includes: a first switch tube Q1, a second switch tube Q2, a first resistor R1, a second resistor R2, a third resistor R3, and a fourth resistor R4; a first end of the first resistor R1 is connected to the output end of the first follower unit 1051, a second end of the first resistor R1 is connected to the control end of the first switch tube Q1, a first electrode of the first switch tube Q1 is connected to the control end of the second switch tube Q2, and a second electrode of the first switch tube Q1 is grounded; a first electrode of the second switch tube Q2 is configured to be connected to the first power supply input end VDD5V0, and a second electrode of the second switch tube Q2 is connected to the control end of the first switch unit 1053; the second resistor R2 is connected between the control end and the second electrode of the first switch tube Q1, the third resistor R3 is connected between the first electrode of the first switch tube Q1 and the control end of the second switch tube Q2; and the fourth resistor R4 is connected between the control end of the second switch tube Q2 and the first electrode of the second switch tube Q2.

[0105] Specifically, the first switching transistor Q1 is configured such that when a first control signal is input to its control terminal, the first and second terminals of the first switching transistor Q1 are turned on through voltage divider protection by the first resistor R1 and the second resistor R2. The potential of the first terminal of the first switching transistor Q1 is at a low level. Since the control terminal of the second switching transistor Q2 is connected to the first terminal of the first switching transistor Q1 via the third resistor R3, a low level is input to the control terminal of the second switching transistor Q2. The second switching transistor Q2 is configured to turn on when a low level is input to its control terminal, thereby connecting the second terminal of the second switching transistor Q2 to the first terminal and outputting the first power signal to the second terminal of the second switching transistor Q2. The second terminal of the second switching transistor Q2 serves as the output terminal of the first driving unit 1052. The third resistor R3 provides current limiting protection, and the fourth resistor R4 and the third resistor R3 act as a voltage divider.

[0106] Optionally, based on various embodiments, and with continued reference to FIG8 , the first switch unit 1053 may include: a third switch transistor Q3 and a fifth resistor R5; the control terminal of the third switch transistor Q3 is connected to the output terminal of the first drive unit 1052, the first electrode of the third switch transistor Q3 is connected to the first terminal of the first output unit 1054, and the second electrode of the third switch transistor Q3 is grounded; and the fifth resistor R5 is connected between the control terminal and the second electrode of the third switch transistor Q3. Optionally, the first output unit 1054 includes a first voltage divider network, the first terminal of the first voltage divider network is connected to the first electrode of the third switch transistor Q3, the second terminal of the first voltage divider network is configured to be connected to the second power input terminal B'+, and the third terminal of the first voltage divider network is configured to be connected to the control terminal of the charging switch transistor M1.

[0107] Specifically, the control terminal of the third switch Q3 receives the first power signal output by the first drive unit 1052. Since the second terminal of the third switch Q3 is grounded, the first terminal of the third switch Q3 serves as the output terminal of the first switch unit 1053. When the first and second terminals of the third switch Q3 are turned on in response to the first power signal received at its control terminal, the output terminal of the first switch unit 1053 outputs a low level, and the first voltage divider network then outputs a low level, controlling the charging switch M1 to turn off.

[0108] When the first and second terminals of the third switch tube Q3 are turned off according to the first power signal received at its control terminal, the output terminal of the first switch unit 1053 outputs a high level, and the first voltage divider network outputs a high level to control the charging switch tube M1 to be turned on.

[0109] Optionally, based on each embodiment, referring to Figure 8, the discharge control module 106 includes: a second follower unit 1061, a second drive unit 1062, a second switch unit 1063 and a second output unit 1064; the second follower unit 1061 is connected to the calculation module 103, and the second follower unit 1061 is configured to receive a second control signal and output a second control signal; the second drive unit 1062 is connected to the second follower unit 1061, and the second drive unit 1062 is configured to be turned on according to the second control signal and output a first power supply signal; the second switch unit 1063 is connected to the second drive unit 1062, and the second switch unit 1063 is configured to be turned on according to the first power supply signal; the second output unit 1064 is connected to the second switch unit 1063, and the second output unit 1064 is configured to output a discharge control voltage.

[0110] Specifically, the second follower unit 1061 may include a voltage follower or a trigger. The second follower unit 1061 receives a second control signal, which includes a trigger signal CHANGE & DISCHANGE_CLK and a second control signal CTR_DISCHARGE_IN. The second follower unit 1061 outputs the received second control signal CTR_DISCHARGE_IN based on the received trigger signal CHANGE & DISCHANGE_CLK.

[0111] The second driving unit 1062 receives the second control signal CTR_DISCHARGE_IN output by the second follower unit 1061 and turns on, and outputs a first power signal. The first power signal is output to the control end of the second switch unit 1063. The second switch unit 1063 turns on according to the first power signal received at its control end. The first end of the second switch unit 1063 is connected to the second power input end B'+, and the second end of the second switch unit 1063 is grounded. The second output unit 1064 is connected between the second power input end B'+ and the first end of the second switch unit 1063. When the second switch unit 1063 is turned on, the second output unit 1064 divides the second power signal of the second power input end B'+ and outputs a discharge control voltage.

[0112] Optionally, based on various embodiments, referring to FIG8 , the second driving unit 1062 includes: a fourth switch tube Q4, a fifth switch tube Q5, a sixth resistor R6, a seventh resistor R7, an eighth resistor R8, and a ninth resistor R9; a first end of the sixth resistor R6 is connected to the output end of the second follower unit 1061, a second end of the sixth resistor R6 is connected to the control end of the fourth switch tube Q4, a first electrode of the fourth switch tube Q4 is connected to the control end of the fifth switch tube Q5, and a second electrode of the fourth switch tube Q4 is grounded; a first electrode of the fifth switch tube Q5 is configured to be connected to the first power supply input end VDD5V0, and a second electrode of the fifth switch tube Q5 is connected to the control end of the second switch unit 1063; the seventh resistor R7 is connected between the control end and the second electrode of the fourth switch tube Q4, the eighth resistor R8 is connected between the first electrode of the fourth switch tube Q4 and the control end of the fifth switch tube Q5; and the ninth resistor R9 is connected between the control end of the fifth switch tube Q5 and the first electrode of the fifth switch tube Q5.

[0113] Specifically, the fourth switch Q4 is configured such that when a second control signal is input to its control terminal, the first and second terminals of the fourth switch Q4 are turned on through voltage divider protection by the sixth resistor R6 and the seventh resistor R7. The potential of the first terminal of the fourth switch Q4 is at a low level. Because the control terminal of the fifth switch Q5 is connected to the first terminal of the fourth switch Q4 via the sixth resistor R6, a low level is input to the control terminal of the fifth switch Q5. The fifth switch Q5 is configured to turn on when a low level is input to its control terminal, thereby connecting the second terminal of the fifth switch Q5 to the first terminal and outputting the first power supply signal to the second terminal of the fifth switch Q5. The second terminal of the fifth switch Q5 serves as the output terminal of the second drive unit 1062. The eighth resistor R8 provides current limiting protection, and the ninth resistor R9 and the eighth resistor R8 function as voltage dividers.

[0114] Optionally, based on the various embodiments, referring to FIG8 , the second switch unit 1063 includes: a sixth switch tube Q6 and a tenth resistor R10; the control end of the sixth switch tube Q6 is connected to the output end of the second drive unit 1062, the first electrode of the sixth switch tube Q6 is connected to the first end of the second output unit 1064, and the second electrode of the sixth switch tube Q6 is grounded; and the tenth resistor R10 is connected between the control end and the second electrode of the sixth switch tube Q6.

[0115] Optionally, the second output unit 1064 includes: a second voltage divider network, a first end of the second voltage divider network is connected to the first electrode of the sixth switch tube Q6, a second end of the second voltage divider network is configured to be connected to the second power input terminal B'+, and a third end of the second voltage divider network is configured to be connected to the control end of the discharge switch tube M2.

[0116] Specifically, the control terminal of the sixth switch transistor Q6 receives the second power signal output by the second driving unit 1062. Since the second terminal of the sixth switch transistor Q6 is grounded, the first terminal of the sixth switch transistor Q6 serves as the output terminal of the second switch unit 1063. When the first and second terminals of the sixth switch transistor Q6 are turned on in response to the second power signal received at its control terminal, the output terminal of the second switch unit 1063 outputs a low level, and the second voltage divider network then outputs a low level, controlling the discharge switch transistor M2 to turn off.

[0117] When the first and second terminals of the sixth switch tube Q6 are turned off according to the second power signal received at its control terminal, the output terminal of the second switch unit 1063 outputs a high level, and the second voltage divider network outputs a high level to control the discharge switch tube M2 to be turned on.

[0118] It should be noted that when the third switch tube Q3 is turned off, the sixth switch tube Q6 is turned on, causing the discharge switch tube M2 to be turned off and the charge switch tube M1 to be turned on, thereby charging the battery. When the sixth switch tube Q6 is turned off, the third switch tube Q3 is turned on, causing the discharge switch tube M2 to be turned on and the charge switch tube M1 to be turned off, allowing the battery to supply power to the load.

[0119] Optionally, based on the various embodiments, referring to Figure 8, the charge and discharge control circuit provided in the present application may further include: an initialization module 107, the input end of the initialization module 107 is configured to be connected to the first power supply input end VDD5V0, and the output end of the initialization module 107 is connected to the charging control module 105 and the discharging control module 106; the initialization module 107 is configured to initialize the charging control module 105 and the discharging control module 106 in the initial stage, and control the charging switch tube M1 to be turned off, and control the discharging switch tube M2 to be turned off.

[0120] Specifically, during the initial startup phase of the power supply, initialization module 107 initializes charging control module 105 and discharging control module 106, turning on first through sixth switching transistors Q1 through Q6, turning off charging switch M1, and turning off discharging switch M2. Initializing the charging and discharging control circuit ensures its safety and reliability.

[0121] Optionally, based on each embodiment, referring to Figure 8, the initialization module 107 includes: a first capacitor C1, an eleventh resistor R11 and a twelfth resistor R12; the first end of the first capacitor C1 is configured to be connected to the first power supply input terminal VDD5V0, the second end of the first capacitor C1 is connected to the first end of the eleventh resistor R11 and the first end of the twelfth resistor R12, the second end of the eleventh resistor R11 is grounded, and the second end of the twelfth resistor R12 is connected to the reset end of the first follower unit 1051 of the charging control module 105 and the reset end of the second follower unit 1061 of the discharge control module 106.

[0122] Specifically, in the initial stage, the voltage across the eleventh resistor R11 is high. The eleventh resistor R11 and the first capacitor C1 form a charge-discharge time constant. An initialization signal is output through the twelfth resistor R12. After initialization, the reset terminals of the first follower unit 1051 and the second follower unit 1061 are SET = 1, Reset = 0, and Q = 1.

[0123] Optionally, the initialization module 107 may further include: a protection control terminal CTR_OFF, which is connected to the calculation module 103. When the protection control terminal CTR_OFF receives a high-level signal, the charging switch tube M1 is turned off, and the discharging switch tube M2 is controlled to be turned off, thereby protecting the battery cell.

[0124] Please refer to Figure 9, which is a schematic diagram of the structure of an electric vehicle provided by this application. As shown in Figure 9, the battery vehicle provided by this application includes the charge and discharge control circuit proposed by this application.

[0125] In related technologies, the main circuit of a 12V low-voltage lithium-ion battery management system (BMS) in a vehicle requires switches to control battery charging, discharging, and protection. When MOSFETs are used as switches to control the main circuit's charging and discharging, the required control voltage is high, resulting in insufficient drive voltage and low drive voltage stability for the MOSFETs controlling the vehicle's battery charging and discharging.

[0126] To this end, in some implementations, the present application provides a boost control circuit.

[0127] Please refer to Figure 10, which is a schematic diagram of the structure of a boost control circuit provided by the present application. As shown in Figure 10, the boost control circuit provided by the present application includes: a switch module 109, a drive module 108, a boost module 110 and a calculation module 103; the calculation module 103 is configured to generate a first control signal CTR_CHARGE_A and a second control signal CTR_DISCHARGE_A in response to an operation instruction of a target user; the drive module 108 is connected to the calculation module 103 and the first power supply terminal VDD5V0, and the drive module 108 is configured to respond to the first control signal CTR_CHARGE_A and the second control signal CTR_DISCHARGE_A RGE_A, generates a switch control signal and a first voltage drive signal; the switch module 109 is connected to the second power supply terminal B+ and the drive module 108, and the switch module 109 is configured to be turned on or off in response to the switch control signal; the boost module 110 is connected to the switch module 109 and the drive module 108, and the boost module 110 is configured to receive the second power supply signal from the second power supply terminal B+ when the switch module 109 is turned on, and boost the voltage according to the second power supply signal and the first voltage drive signal to output a second voltage signal; wherein the amplitude of the second voltage signal is greater than the amplitude of the second power supply signal.

[0128] Specifically, calculation module 103 generates a first control signal CTR_CHARGE_A and a second control signal CTR_DISCHARGE_A. Driver module 108 generates a switch control signal based on the first and second control signals CTR_CHARGE_A and CTR_DISCHARGE_A. The switch control signal acts on the control terminal of switch module 109, turning on switch module 109. After turning on, switch module 109 transmits the second power signal transmitted from the second power terminal B+ to the second terminal of switch module 109.

[0129] The driving module 108 generates a first voltage driving signal based on the first power signal transmitted by the first power supply terminal VDD5V0 according to the first control signal CTR_CHARGE_A and the second control signal CTR_DISCHARGE_A. The first voltage driving signal is output to the boost module 110. The boost module 110 is connected between the output end of the switch module 109 and the output end of the boost module 110. The boost module 110 boosts the voltage at the output end of the switch module 109 according to the first voltage driving signal and the second power signal, and outputs a second voltage signal. The second end of the switch module 109 is connected to the output interface of the boost control circuit, and the second voltage signal output by the boost module 110 is relatively stable. Since the amplitude of the second voltage signal is higher than the amplitude of the second power signal, the second voltage signal output by the output interface can meet the driving voltage requirements of the MOS tube that controls the charging and discharging of the battery.

[0130] The technical solution provided in this application generates a first control signal CTR_CHARGE_A and a second control signal CTR_DISCHARGE_A in response to the operation instruction of the target user through the calculation module 103, and generates a switch control signal and a first voltage drive signal in response to the first control signal CTR_CHARGE_A and the second control signal CTR_DISCHARGE_A through the driving module 108. By setting the switch module 109 to be connected to the second power supply terminal B+ and the driving module 108, the switch module 109 is turned on or off in response to the switch control signal. When the switch module 109 is turned on, the boost module 110 receives the second power supply signal and boosts the voltage according to the first voltage drive signal and the second power supply signal, outputting a second voltage signal with an amplitude greater than the second power supply signal, so that the second voltage signal output by the output interface of the boost control circuit can meet the driving voltage requirement of the MOS tube that controls the charging and discharging of the battery.

[0131] Please refer to Figure 11, which is a structural diagram of another boost control circuit provided by the present application. Based on the embodiment, in combination with Figures 10 and 11, the driving module 108 may include: an input logic module 1081, a first driving module 1082, a second driving module 1083 and an output logic module 1084; the input logic module 1081 is connected to the calculation module 103, and the input logic module 1081 is configured to generate a first logic control signal according to the first control signal CTR_CHARGE_A and the second control signal CTR_DISCHARGE_A; the first driving module 1082 is connected to the input logic module 1081 and the switch module 109 The first driving module 1082 is configured to be turned on according to the first logic control signal and output a switch control signal to the switch module 109; the second driving module 1083 is connected to the input logic module 1081 and the first power supply terminal VDD5V0, and the second driving module 1083 is configured to output a first driving signal according to the first logic control signal and the first power supply signal output by the first power supply terminal VDD5V0; the output logic module 1084 is connected to the second driving module 1083, and the output logic module 1084 is configured to generate a first voltage driving signal according to the first driving signal.

[0132] Specifically, the input end of the input logic module 1081 is configured to receive the first control signal CTR_CHARGE_A and the second control signal CTR_DISCHARGE_A generated by the calculation module 103. The input logic module 1081 generates a first logic control signal based on the levels of the first control signal CTR_CHARGE_A and the second control signal CTR_DISCHARGE_A input to its input end. The first logic control signal is input to the first driver module 1082 and the second driver module 1083, respectively. The first driver module 1082 generates a switch control signal based on the received first logic control signal. The control end of the switch module 109 is turned on in response to the input switch control signal, transmitting the second power supply signal to the output end of the switch module 109.

[0133] The second driving module 1083 generates a first driving signal based on the received first logic control signal. The output logic module 1084 generates a first voltage driving signal based on the first driving signal input to its input terminal and the reference voltage at its input terminal. The first voltage driving signal is output to the boost module 110.

[0134] Optionally, based on various embodiments, in combination with Figures 10 and 11, the first driving module 1082 may include: a seventh switch tube Q7, an eighth switch tube Q8 and a thirteenth resistor R13; the control end of the seventh switch tube Q7 is connected to the output end of the input logic module 1081, the first electrode of the seventh switch tube Q7 is connected to the control end of the eighth switch tube Q8 and the first end of the thirteenth resistor R13, the second end of the thirteenth resistor R13 is configured to be connected to the first power supply end VDD5V0, the first electrode of the eighth switch tube Q8 is connected to the control end of the switch module 109, and the second electrode of the seventh switch tube Q7 and the second electrode of the eighth switch tube Q8 are grounded.

[0135] Specifically, when the seventh switch Q7 is turned off based on the first logic control signal input to its control terminal, the control terminal of the eighth switch Q8 receives the first power supply signal, for example, a high-level signal, and the eighth switch Q8 is turned on. When the eighth switch Q8 is turned on, the output terminal of the first driver module 1082 outputs a switch control signal, for example, a low-level signal. The thirteenth resistor R13 functions as a current limiter.

[0136] Optionally, based on various embodiments, in combination with FIG10 and FIG11 , the second driving module 1083 may include: a ninth switching transistor Q9, a tenth switching transistor Q10, an eleventh switching transistor Q11, a fourteenth resistor R14, and a fifteenth resistor R15; the control end of the ninth switching transistor Q9 is connected to the output end of the input logic module 1081, the first electrode of the ninth switching transistor Q9 is connected to the control end of the tenth switching transistor Q10 and the first end of the fourteenth resistor R14, the second end of the fourteenth resistor R14 is configured to be connected to the first power supply end VDD5V0, the first electrode of the tenth switching transistor Q10 is connected to the control end of the eleventh switching transistor Q11 and the first end of the fifteenth resistor R15, and the second end of the fifteenth resistor R15 is connected to the first electrode of the eleventh switching transistor Q11 and the first power supply end VDD5V0; the second electrode of the ninth switching transistor Q9 and the second electrode of the tenth switching transistor Q10 are grounded, and the second electrode of the eleventh switching transistor Q11 is connected to the output logic module 1084 as the output end of the second driving module 1083.

[0137] Specifically, the ninth switch Q9 is turned off based on a first logic control signal, such as a low-level signal, input to its control terminal. When the ninth switch Q9 is turned off based on the first logic control signal input to its control terminal, a first power supply signal, such as a high-level signal, is input to the control terminal of the tenth switch Q10, turning on the tenth switch Q10. When the tenth switch Q10 is turned on, a low-level signal is input to the control terminal of the eleventh switch Q11, turning on the eleventh switch Q11. When the eleventh switch Q11 is turned on, the output terminal of the second driver module 1083 outputs a first drive signal, such as a high-level signal. The fourteenth resistor R14 and the fifteenth resistor R15 function as current limiters.

[0138] Optionally, based on each embodiment, in combination with Figures 10 and 11, the input logic module 1081 may include: a first AND gate U1; the first input end of the first AND gate U1 is connected to the computing module 103 to be configured to input the first control signal CTR_CHARGE_A, the second input end of the first AND gate U1 is connected to the computing module 103 and is configured to input the second control signal CTR_DISCHARGE_A, and the output end of the first AND gate U1 is connected to the first driving module 1082 and the second driving module 1083.

[0139] Specifically, when the logics of the first control signal CTR_CHARGE_A and the second control signal CTR_DISCHARGE_A inputted to the first input terminal and the second input terminal are different, the first AND gate U1 outputs logic 0, and the first logic control signal is a low level signal.

[0140] Optionally, based on each embodiment, in combination with Figures 10 and 11, the output logic module 1084 may include: a second AND gate U2, a first capacitor C1 and a sixteenth resistor R16; the first input end of the second AND gate U2 is connected to the output end of the second driving module 1083, the second input end of the second AND gate U2 is connected to the first end of the first capacitor C1 and the first end of the fourth resistor, the second end of the first capacitor C1 is grounded, the second end of the fourth resistor is connected to the output end of the second AND gate U2, and the output end of the second AND gate U2 is configured to output a first voltage drive signal.

[0141] Specifically, a high voltage signal is input to the first input terminal of the second AND gate U2 of the output logic module 1084, and the second input terminal of the second AND gate U2 is grounded via the first capacitor C1. The first capacitor C1 is charged via the fourth resistor, causing the potential of the second input terminal of the second AND gate U2 to increase. The output terminal of the second AND gate U2 outputs a first voltage drive signal, for example, a high voltage signal.

[0142] Optionally, based on each embodiment, in combination with Figures 10 and 11, the boost module 110 may include: a first-stage boost unit 111 and a second-stage boost unit 112; the input end of the first-stage boost unit 111 is connected to the output end of the driving module 108, the output end of the first-stage boost unit 111 is connected to the output end of the switching module 109 at the first node A, and the first-stage boost unit 111 is configured to perform a first-stage boost on the voltage of the first node A; the boost control circuit includes an output interface OUT, the output interface OUT is connected to the first node A, the second-stage boost unit 112 is connected between the first-stage boost unit 111 and the first node A, and the second-stage boost unit 112 is configured to perform a second-stage boost on the voltage of the first node A; the output interface OUT is configured to output a second voltage signal after the second-stage boost.

[0143] Specifically, the first-stage boost unit 111 improves the energy storage capability of the first-stage boost unit 111 by changing the voltage difference between the input and output terminals of the first-stage boost unit 111, thereby performing a first-stage boost on the voltage of the first node A. The second-stage boost unit 112 is connected to the first-stage boost unit 111 and performs a second-stage boost on the voltage of the first node A, thereby increasing the voltage of the first node A and effectively ensuring the stability of the second voltage signal output by the output interface OUT.

[0144] Optionally, based on various embodiments, in combination with Figures 10 and 11, the first-stage boost unit 111 includes: a first inverter U3, a sixth capacitor C6, and a seventeenth resistor R17; the input end of the first inverter U3 is connected to the output end of the driver module 108, the output end of the first inverter U3 is connected to the first end of the sixth capacitor C6, the second end of the sixth capacitor C6 is connected to the first end of the seventeenth resistor R17, and the second end of the seventeenth resistor R17 is connected to the output interface OUT. Optionally, the first inverter U3 is configured to invert the second voltage signal, the sixth capacitor C6 is configured to store electrical energy, and the seventeenth resistor R17 is configured to limit current.

[0145] Specifically, the first inverter U3 is configured to invert and output the first voltage drive signal. The sixth capacitor C6 is configured to store energy. The seventeenth resistor R17 is configured for current limiting protection. The energy storage voltage of the sixth capacitor C6 can be set to be greater than the voltage of the second power supply. When the sixth capacitor C6 is fully charged, the switch module 109 is disconnected, causing the sixth capacitor C6 to discharge, and the amplitude of the second voltage signal output by the output interface OUT is greater than the amplitude of the second power supply signal.

[0146] Optionally, based on the various embodiments, in combination with Figures 10 and 11, the second-stage boost unit 112 may include: a second inverter U4, a seventh capacitor C7 and an eighteenth resistor R18; the input end of the second inverter U4 is connected to the output end of the first inverter U3, the output end of the second inverter U4 is connected to the first end of the seventh capacitor C7, the second end of the seventh capacitor C7 is connected to the first end of the eighteenth resistor R18, and the second end of the eighteenth resistor R18 is connected to the output interface OUT.

[0147] Optionally, the second inverter U4 is configured to invert the electrical signal output by the first inverter U3, the seventh capacitor C7 is configured to store electrical energy, and the eighteenth resistor R18 is configured to limit current.

[0148] Specifically, the second inverter U4 is configured to invert and output the first voltage drive signal output by the first inverter U3. The seventh capacitor C7 is configured to store energy. The eighteenth resistor R18 is configured for current limiting protection. The energy storage voltage of the seventh capacitor C7 can be set to be greater than the voltage of the first node A. When the seventh capacitor C7 is fully charged, the switch module 109 is disconnected, causing the seventh capacitor C7 to discharge, thereby increasing the amplitude of the second voltage signal output by the output interface OUT, thereby increasing the driving capability of the second voltage signal output by the output interface OUT of the boost control circuit on the battery charge and discharge control MOS tube.

[0149] Optionally, based on the various embodiments, in combination with Figures 10 and 11, the boost control circuit may further include: a surge control module 120, the surge control module 120 is connected between the switch module 109 and the boost module 110, and the surge control module 120 is connected to the calculation module 103; the surge control module 120 is configured to be turned on in response to the third control signal of the calculation module 103 to reduce the surge of the boost control circuit.

[0150] Specifically, when the boost module 110 is charging, the surge control module 120 provides current limiting protection. When the boost module 110 boosts the voltage to the second power signal, the surge control module 120 turns on in response to the third control signal, reducing the self-consumption energy of the surge control module 120. This protects the boost control circuit and effectively minimizes energy loss caused by the surge control module 120.

[0151] Based on various embodiments, in conjunction with FIG10 and FIG11 , the surge control module 120 may include: a current limiting resistor R19, a twelfth switch transistor Q12, a thirteenth switch transistor Q13, an eighth capacitor C8, a third voltage divider network 51, and a fourth voltage divider network 52. The current limiting resistor R19 is connected between the switch module 109 and the boost module 110. A first electrode of the twelfth switch transistor Q12 is connected to the switch module 109 and a first end of the third voltage divider network 51, a second electrode of the twelfth switch transistor Q12 is connected to the boost module 110 and a first end of the eighth capacitor C8, and a second end of the eighth capacitor C8 is grounded. A control end of the twelfth switch transistor Q12 is connected to a second end of the third voltage divider network 51, a third end of the third voltage divider network 51 is connected to a first electrode of the thirteenth switch transistor Q13, and a second electrode of the thirteenth switch transistor Q13 is grounded. A control end of the thirteenth switch transistor Q13 is connected to a second end of the fourth voltage divider network 52, a first end of the fourth voltage divider network 52 is connected to the calculation module 103, and a third end of the fourth voltage divider network 52 is grounded.

[0152] Specifically, when the boost module 110 is charging, the current-limiting resistor R19 performs a current-limiting protection function. When the boost module 110 boosts the voltage to the second power supply signal, the thirteenth switch tube Q13 is turned on in response to the third control signal output by the calculation module 103, so that the control terminal of the twelfth switch tube Q12 is connected to a low-level signal, and the twelfth switch tube Q12 is turned on. The turned-on twelfth switch tube Q12 bypasses the current-limiting resistor R19, thereby reducing the power loss of the current-limiting resistor R19. The third voltage divider network 51 performs a current-limiting function, and the fourth voltage divider network 52 performs a current-limiting function. The eighth capacitor C8 performs an energy storage function. This configuration can reduce the self-consumption energy of the surge control module 120, thereby protecting the boost control circuit and effectively avoiding the power loss of the surge control module 120.

[0153] Optionally, based on each embodiment, in combination with Figures 10 and 11, the switch module 109 includes: a switch tube Q29, the first pole of the switch tube Q29 is configured to be connected to the second power supply terminal B+, the second pole of the switch tube Q29 is connected to the input end of the surge control module 120, and the control end of the switch tube Q29 is connected to the output end of the first driving module 1082 of the driving module 108.

[0154] Optionally, an anti-reverse connection diode may be provided between the first node A and the output interface OUT.

[0155] Please refer to Figure 12, which is a schematic diagram of the structure of an electric vehicle provided by this application. Based on the embodiments provided by this application, as shown in Figure 12, this application provides an electric vehicle, including the boost control circuit proposed in any embodiment.

[0156] Optionally, Figure 12 exemplarily shows that the charging switch tube M1 and the discharging switch tube M2 are connected between the battery and the load. The boost control circuit proposed in any embodiment of the present application includes a boost control module 170, which is connected between the calculation module 103 and the battery and the load. The calculation module 103 performs a boost according to the control signal received by its control end and outputs a second voltage signal. When the charging control module 105 drives the charging switch tube M1 to turn on based on the second voltage signal according to the control signal of the calculation module 103, the external power supply charges the battery. The discharge control module 106 drives the discharge switch tube M2 to turn on based on the second voltage signal according to the control signal of the calculation module 103, so that the battery can supply power to the load.

[0157] In the prior art, the circuits of lithium-ion battery management systems are primarily controlled by power switches. Considering battery safety during charging and discharging, fault diagnosis of the power switches is necessary. However, detecting the voltage of the switch to diagnose faults is less accurate. The applicant has discovered that testing the switch requires consideration of factors such as the voltage drop, pre-charge voltage, and the cell's own voltage variation factor.

[0158] To this end, in some implementations, the present application provides a switch tube detection circuit for a battery management system.

[0159] Please refer to Figure 13, which is a schematic diagram of the connection between the switch detection circuit of a battery management system provided by this application and the battery management system. As shown in Figure 13, the battery management system includes: a battery 303, a charging switch module 130, a discharging switch module 140, and a charge-discharge interface 104. The charge-discharge interface 104 and the charging switch module 130 are connected to a first detection terminal TP30, the charging switch module 130 and the discharging switch module 140 are connected to a second detection terminal S0, and the discharging switch module 140 and the battery 303 are connected to a third detection terminal PACK_POS.

[0160] The switch detection circuit of the battery management system includes: a calculation module 103, a first acquisition module 150, and a second acquisition module 160. The calculation module 103 is configured to generate a first control signal and a second control signal. The first acquisition module 150 is connected to the calculation module 103 and the second detection terminal S0. The first acquisition module 150 is configured to acquire a second voltage signal from the second detection terminal S0 based on the first control signal. The second acquisition module 160 is connected to the calculation module 103, the first detection terminal TP30, and the third detection terminal PACK_POS. The second acquisition module 160 is configured to acquire a first voltage signal from the first detection terminal TP30 and a third voltage signal from the third detection terminal PACK_POS based on the second control signal. The calculation module 103 is configured to determine the fault status of the charging switch module 130 and the discharging switch module 140 based on the first, second, and third voltage signals.

[0161] Specifically, battery 303 provides energy for the battery management system. The operating principle of the battery management system's switch detection circuit is as follows: the calculation module 103 outputs a first control signal to the first acquisition module 150. Based on the first control signal, the first acquisition module 150 acquires the voltage signal at the second detection terminal S0 and transmits it to the calculation module 103. The calculation module 103 outputs a second control signal to the second acquisition module 160. Based on the second control signal, the second acquisition module 160 acquires the voltage signals at the first detection terminal TP30 and the third detection terminal PACK_POS and transmits them to the calculation module 103. Because both the charging switch module 130 and the discharging switch module 140 experience a conduction voltage drop when they are turned on, under normal circumstances, the voltage values ​​at the third detection terminal PACK_POS, the second detection terminal S0, and the first detection terminal TP30 decrease in sequence. The calculation module 103 determines whether the charging switch module 130 or the discharging switch module 140 is faulty and the type of fault based on the differences between the first, second, and third voltage signals.

[0162] Exemplarily, when the system is powered on, the computing module 103 outputs a first control signal and a second control signal. When the computing module 103 controls both the charging switch module 130 and the discharging switch module 140 to be off, if the voltage at the second detection terminal S0 is equal to the voltage at the third detection terminal PACK_POS, a short circuit fault occurs in the corresponding discharging switch module 140. When the computing module 103 controls the charging switch module 130 to be off and the discharging switch module 140 to be on, if the voltage at the second detection terminal S0 is not equal to the voltage at the third detection terminal PACK_POS, an open circuit fault occurs in the corresponding discharging switch module 140. When the computing module 103 controls the charging switch module 130 to be off and the discharging switch module 140 to be on, if the voltage at the first detection terminal TP30 is equal to the voltage at the second detection terminal S0, a short circuit fault occurs in the corresponding charging switch module 130. When the calculation module 103 controls the charging switch module 130 to be turned on and the discharging switch module 140 to be turned off, if the voltage of the first detection terminal TP30 is not equal to the voltage of the second detection terminal S0, an open circuit fault occurs in the corresponding charging switch module 130.

[0163] The technical solution provided by the present application is to set up a first acquisition module 150 and a second acquisition module 160 to respectively collect the voltage signals at both ends of the charging switch module 130 and the discharging switch module 140. Since there is a conduction voltage drop when the charging switch module 130 and the discharging switch module 140 are turned on, there is a difference between the first voltage signal, the second voltage signal, and the third voltage signal. The calculation module 103 can determine whether the charging switch module 130 and the discharging switch module 140 are faulty and the type of fault based on the size of the difference between the first voltage signal, the second voltage signal, and the third voltage signal. The technical solution provided by the present application can detect faults in the switch tubes of the battery management system and improve the accuracy of fault diagnosis.

[0164] Based on various embodiments, optionally, the charging switch module 130 includes N charging switch tubes, where N is a positive integer greater than or equal to 1. The discharging switch module 140 includes N discharging switch tubes and N bypass resistors. The Nth charging switch tube and the Nth discharging switch tube are connected to an Nth node, wherein the second detection terminal S0 includes N nodes. The Nth bypass resistor is connected in parallel between the first and second terminals of the Nth discharging switch tube.

[0165] The first acquisition module 150 includes N sampling units, each of which has its control terminal connected to the first enable terminal EN_1 of the calculation module 103 , an input terminal of the Nth sampling unit connected to the Nth node, and an output terminal of the Nth sampling unit connected to the Nth input terminal of the calculation module 103 .

[0166] Specifically, when the battery management system is operating normally, after the battery management system is powered on, the N bypass resistors are precharged, and the voltage of each node will rise. The rising voltage value and the time of precharging the bypass resistors are related to the value of the bypass resistors and the system parasitic capacitance RC time constant. Due to the voltage drop of the charging switch tube, the voltage of the first detection terminal TP30 decreases relative to the voltage of the node, and the value of the decrease is related to the magnitude of the voltage drop of the charging switch tube. For example, when the power supply voltage is 12V, after the battery management system is powered on, the Nth bypass resistor is precharged, and the voltage of the Nth node rises to about 11V in about 1s, then the voltage of the first detection terminal TP30 is about 10.8V.

[0167] In some embodiments, as shown in FIG14 , the battery management system further includes a driver module 108 . The computing module 103 further includes a driver control terminal. The driver module 108 has an input terminal connected to the driver control terminal. The driver module 108 includes 2N output terminals, each of which is connected to N charging switches and N discharging switches, respectively. The computing module 103 outputs a control signal from the driver control terminal to the driver module 108 , which then uses the driver module 108 to control the on / off switching of the charging and discharging switches, thereby enabling the system to operate in a charging or discharging state.

[0168] In this embodiment, N charging switches, N discharging switches, and N bypass resistors are provided, and N sampling units are provided to collect the midpoint voltage and terminal voltage of the charging and discharging switches. The difference between these voltage signals is used to diagnose the fault status of the switches. This configuration facilitates circuit design flexibility and improves the accuracy of fault diagnosis.

[0169] Based on each embodiment, the number of charging switch tubes, discharging switch tubes and sampling units can be designed according to actual needs and is not limited here. Below, taking N=1 as an example, the specific structure and working principle of the switch tube detection circuit of the battery management system may be described.

[0170] Please refer to Figure 14, which is a circuit diagram of the connection between the switch tube detection circuit of a battery management system provided in the present application and the battery management system. As shown in Figure 14, based on each embodiment, optionally, the sampling unit includes: a fourteenth switch tube Q14, a fifteenth switch tube Q15, a fifth voltage divider network 2021, a sixth voltage divider network 2022 and a twentieth resistor R20.

[0171] The control end of the fourteenth switch tube Q14 is connected to the first enable terminal EN_1 of the calculation module 103. The first and second ends of the fifth voltage divider network 2021 are connected between the control end of the fourteenth switch tube Q14 and the first enable terminal EN_1 of the calculation module 103. The third end of the fifth voltage divider network 2021 and the second electrode of the fourteenth switch tube Q14 are connected to the ground terminal GND.

[0172] A first electrode of the fourteenth switching transistor Q14 is connected to the control terminal of the fifteenth switching transistor Q15. The first electrode of the fifteenth switching transistor Q15 is connected to the second detection terminal S0. A first end and a second end of the sixth voltage divider network 2022 are connected between the control terminal of the fifteenth switching transistor Q15 and the first electrode of the fourteenth switching transistor Q14. A third end of the sixth voltage divider network 2022 is connected to the first electrode of the fifteenth switching transistor Q15. A second electrode of the fifteenth switching transistor Q15 is connected to the first end of the twentieth resistor R20 and the first input terminal of the calculation module 103. The second end of the twentieth resistor R20 is grounded.

[0173] Specifically, the calculation module 103 controls the first enable terminal EN_1 to be at a high level. After voltage division by the fifth voltage divider network 2021, the control terminal of the fourteenth switch Q14 receives this high-level signal, turning on the fourteenth switch Q14. After its on-state voltage is divided by the sixth voltage divider network 2022, the control terminal of the fifteenth switch Q15 receives the voltage signal at the first terminal of the fourteenth switch Q14, turning on the fifteenth switch Q15. The second terminal of the fifteenth switch Q15 is grounded via the twentieth resistor R20. By calculating the voltage difference between the first terminal and the second terminal of the fifteenth switch Q15, a voltage signal at the second detection terminal S0 is obtained and transmitted to the calculation module 103 for fault diagnosis of the switch.

[0174] For example, when N=3, as shown in FIG14 , the charging switch module 130 includes a first charging switch transistor Q23, a second charging switch transistor Q24, and a third charging switch transistor Q25. The discharging switch module 140 includes a first bypass resistor R34, a second bypass resistor R35, a third bypass resistor R36, a first discharge switch transistor Q26, a second discharge switch transistor Q27, and a third discharge switch transistor Q28. The second detection terminal S0 includes a first node S1, a second node S2, and a third node S3. The voltage signal at the second detection terminal S0 includes a first acquisition signal S1_OUT, a second acquisition signal S2_OUT, and a third acquisition signal S3_OUT. The sampling unit further includes: a nineteenth switch tube Q19, a twentieth switch tube Q20, a seventh voltage divider network 2023, an eighth voltage divider network 2024, a thirty-second resistor R32, a twenty-first switch tube Q21, a twenty-second switch tube Q22, a ninth voltage divider network 2025, a tenth voltage divider network 2026 and a thirty-third resistor R33.

[0175] In this embodiment, by setting the fourteenth switch tube Q14, the fifteenth switch tube Q15, the fifth voltage divider network 2021, the sixth voltage divider network 2022 and the twentieth resistor R20 in the sampling unit, the voltage signal of the second detection terminal S0 is collected and transmitted. This setting structure is simple and is conducive to improving the accuracy of fault diagnosis.

[0176] Continuing to refer to FIG. 14 , based on various embodiments, optionally, the sampling unit further includes: a current limiting resistor connected between the first electrode of the fifteenth switch tube Q15 and the second detection terminal S0 .

[0177] Specifically, the resistance of the current-limiting resistor is designed based on actual needs. The current-limiting resistor can prevent excessive current from flowing through the first terminal and the second detection terminal S0 of the fifteenth switching transistor Q15, thereby damaging the switching transistor. For example, when N=3, the sampling unit includes a first current-limiting resistor R29, a second current-limiting resistor R30, and a third current-limiting resistor R31.

[0178] In this application, a current-limiting resistor is provided to prevent excessive current from damaging the switch tube and the circuit, thereby improving the safety of the circuit.

[0179] Please refer to Figure 15, which is a schematic diagram of the connection between the switch detection circuit and the battery management system of another battery management system provided by this application. As shown in Figure 15, based on various embodiments, the second acquisition module 160 optionally includes a first switch module 161, a second switch module 162, a third switch module 163, and a differential module 164.

[0180] The control terminal of the first switch module 161 is connected to the second enable terminal EN_2 of the computing module 103. The first terminal of the first switch module 161 is connected to the control terminal of the second switch module 162 and the control terminal of the third switch module 163. The second terminal of the first switch module 161 is grounded. The first switch module 161 is configured to control the first and second switch modules 161 and 162 to conduct according to a second control signal. The first terminal of the second switch module 162 is connected to the first detection terminal TP30, and the second terminal of the second switch module 162 is connected to the first input terminal of the differential module 164. The second switch module 162 is configured to output the collected first voltage signal to the differential module 164. The first terminal of the third switch module 163 is connected to the third detection terminal PACK_POS, and the second terminal of the third switch module 163 is connected to the second input terminal of the differential module 164. The third switch module 163 is configured to output the collected third voltage signal to the differential module 164. The output end of the differential module 164 is connected to the second input end of the calculation module 103 . The differential module 164 is configured to perform differential calculation according to the received first voltage signal and the third voltage signal, and output a differential signal CB_DIAG to the calculation module 103 .

[0181] Specifically, the calculation module 103 controls the second enable terminal EN_2 to be at a high level. This high-level signal is then applied to the control terminal of the first switch module 161, turning on the first switch module 161. The control terminals of the second switch module 162 and the third switch module 163 are then connected to the voltage signal applied to the first terminal of the first switch module 161. The voltage signal at the first detection terminal TP30 then passes through the second switch module 162 and is input to the differential module 164 from the second terminal of the second switch module 162. The voltage signal at the third detection terminal PACK_POS then passes through the third switch module 163 and is input to the differential module 164 from the second terminal of the third switch module 163. The differential module 164 performs a differential calculation on the received first and third voltage signals and outputs a differential signal CB_DIAG to the calculation module 103.

[0182] In this embodiment, by setting the first switch module 161, the second switch module 162, the third switch module 163 and the differential module 164 in the second acquisition module 160, the voltage signals of the first detection terminal TP30 and the third detection terminal PACK_POS are collected and transmitted. This structure is simple and is conducive to improving the accuracy of fault diagnosis.

[0183] Please refer to Figure 16, which is a circuit diagram of another battery management system provided by the present application, in which the switch tube detection circuit is connected to the battery management system. As shown in Figure 16, based on the various embodiments, optionally, the first switch module 161 includes: a sixteenth switch tube Q16, a twenty-first resistor R21, and a twenty-second resistor R22. The control end of the sixteenth switch tube Q16 is connected to the first end of the twenty-first resistor R21, and the second end of the twenty-first resistor R21 serves as the control end of the first switch module 161. The twenty-second resistor R22 is connected between the control end and the second pole of the sixteenth switch tube Q16, and the second pole of the sixteenth switch tube Q16 is connected to the ground terminal GND. The first pole of the sixteenth switch tube Q16 serves as the first end of the first switch module 161.

[0184] Specifically, the calculation module 103 controls the second enable terminal EN_2 to be at a high level. The second end of the twenty-first resistor R21 receives the high-level signal, which is then input to the control terminal of the sixteenth switch Q16 through the first end of the twenty-first resistor R21. The signal is also input to the second terminal of the sixteenth switch Q16 through the twenty-second resistor R22, thereby turning on the sixteenth switch Q16. The first terminal of the sixteenth switch Q16 outputs a control signal to the second switch module 162 and the third switch module 163. The second terminal of the sixteenth switch Q16 is grounded.

[0185] In this embodiment, a sixteenth switch transistor Q16, a twenty-first resistor R21, and a twenty-second resistor R22 are provided in the first switch module 161, thereby turning on the sixteenth switch transistor Q16. Upon receiving the second control signal from the calculation module 103, the sixteenth switch transistor Q16 controls the second switch module 162 and the third switch module 163 to turn on, thereby improving the accuracy of fault diagnosis.

[0186] Continuing to refer to FIG. 16 , based on various embodiments, optionally, the second switch module 162 includes: a seventeenth switch tube Q17 , a twenty-third resistor R23 , a twenty-fourth resistor R24 ​​, and a twenty-fifth resistor R25 .

[0187] The control end of the seventeenth switch transistor Q17 is connected to the first end of the twenty-third resistor R23 and the first end of the twenty-fourth resistor R24. The second end of the twenty-third resistor R23 serves as the control end of the second switch module 162. The second end of the twenty-fourth resistor R24 ​​is connected to the first end of the seventeenth switch transistor Q17, serving as the first end of the second switch module 162. The second end of the seventeenth switch transistor Q17 is connected to the first end of the twenty-fifth resistor R25, and the second end of the twenty-fifth resistor R25 serves as the second end of the second switch module 162.

[0188] Specifically, the control signal output from the first terminal of the sixteenth switch Q16 is input to the control terminal of the seventeenth switch Q17 via the twenty-third resistor R23. Simultaneously, the control signal is connected to the first terminal of the seventeenth switch Q17 via the twenty-fourth resistor R24, turning on the seventeenth switch Q17. The voltage signal at the first detection terminal TP30 is obtained by calculating the voltage difference between the first terminal of the seventeenth switch Q17 and the second terminal of the seventeenth switch Q17. This voltage signal is then output to the differential module 164 via the twenty-fifth resistor R25.

[0189] In this embodiment, the seventeenth switch Q17, the twenty-third resistor R23, the twenty-fourth resistor R24, and the twenty-fifth resistor R25 are provided in the second switch module 162, thereby turning on the seventeenth switch Q17. After collecting the voltage signal from the first detection terminal TP30, the seventeenth switch Q17 transmits it to the differential module 164, which processes it and outputs it to the calculation module 103, thereby improving the accuracy of fault diagnosis.

[0190] Continuing to refer to FIG. 16 , based on various embodiments, optionally, the third switch module 163 includes: an eighteenth switch tube Q18 , a twenty-sixth resistor R26 , a twenty-seventh resistor R27 , and a twenty-eighth resistor R28 .

[0191] The control end of the eighteenth switch transistor Q18 is connected to the first end of the twenty-sixth resistor R26 and the first end of the twenty-seventh resistor R27. The second end of the twenty-sixth resistor R26 serves as the control end of the third switch module 163. The second end of the twenty-seventh resistor R27 is connected to the first end of the eighteenth switch transistor Q18, serving as the first end of the third switch module 163. The second end of the eighteenth switch transistor Q18 is connected to the first end of the twenty-eighth resistor R28, and the second end of the twenty-eighth resistor R28 serves as the second end of the third switch module 163.

[0192] Specifically, the control signal output from the first terminal of the sixteenth switch Q16 is input to the control terminal of the eighteenth switch Q18 via the twenty-sixth resistor R26. Simultaneously, the control signal is connected to the first terminal of the eighteenth switch Q18 via the twenty-seventh resistor R27, thereby turning on the eighteenth switch Q18. The voltage difference between the first terminal of the eighteenth switch Q18 and the second terminal of the eighteenth switch Q18 is calculated to obtain a voltage signal at the third detection terminal PACK_POS. This voltage signal is then output to the differential module 164 via the twenty-eighth resistor R28.

[0193] In this embodiment, the eighteenth switch Q18, the twenty-sixth resistor R26, the twenty-seventh resistor R27, and the twenty-eighth resistor R28 are provided in the third switch module 163, thereby turning on the eighteenth switch Q18. After collecting the voltage signal at the third detection terminal PACK_POS, the eighteenth switch Q18 transmits it to the differential module 164, which processes it and outputs it to the calculation module 103, thereby improving the accuracy of fault diagnosis.

[0194] Based on each embodiment, optionally, when the battery 303 is charging, the calculation module 103 is configured to compare the first voltage signal with a first preset threshold, compare the second voltage signal with a second preset threshold, and compare the third voltage signal with a third preset threshold, to determine whether a short circuit or open circuit fault occurs in the charging switch module 130 and the discharging switch module 140.

[0195] When the battery 303 is discharging, the calculation module 103 is configured to compare the first voltage signal with the fourth preset threshold, the second voltage signal with the fifth preset threshold, and the third voltage signal with the sixth preset threshold, respectively, to determine whether a short circuit or open circuit fault occurs in the charging switch module 130 and the discharging switch module 140.

[0196] Exemplarily, each preset threshold is determined based on the voltage signal corresponding to each detection end when the circuit is in normal operation. When the battery 303 is charging, the first preset threshold is set to Vb-1.2, the second preset threshold is Vb-1, and the third preset threshold is Vb. The system controls the charging switch module 130 to be turned on and the discharging switch module 140 to be turned off. If the first voltage signal and the second voltage signal are both Vb, a short circuit fault occurs in the charging switch module 130; if the first voltage signal is not equal to the second voltage signal, and the second voltage signal is Vb-1, an open circuit fault occurs in the charging switch module 130. When the battery 303 is discharging, the fourth preset threshold is set to Vb-1.2, the fifth preset threshold is Vb-1, and the sixth preset threshold is Vb. The system controls the charging switch module 130 to be turned off and the discharging switch module 140 to be turned on. If the second voltage signal is Vb-1, the discharging switch module 140 is normal; if the second voltage signal is Vb, a short circuit fault occurs in the discharging switch module 140.

[0197] In this embodiment, by setting a preset threshold corresponding to each voltage signal and using the calculation module 103 to perform comparison, the fault state of each switch module is diagnosed, thereby improving the accuracy of fault diagnosis.

[0198] The present application also provides a battery management system, which includes the switch tube detection circuit of the battery management system provided in any embodiment of the present application.

[0199] The present application also provides an electric vehicle, which includes the switch tube detection circuit of the battery management system provided in any embodiment of the present application, or the battery management system provided in any embodiment of the present application.

Claims

1. A SOC detection circuit for a battery management system, comprising: A first current acquisition module (101) is connected in series to the main circuit (300) of the battery management system and is configured to acquire first current information of the main circuit (300); A second current acquisition module (102) is connected in series to the control loop (200) of the battery management system and is configured to acquire second current information of the control loop (200); A calculation module (103) is respectively connected to the first current acquisition module (101) and the second current acquisition module (102), and is configured to calculate the SOC value of the battery management system according to the first current information and the second current information.

2. The SOC detection circuit of the battery management system according to claim 1, wherein: The main circuit (300) comprises: a first interface (301), a charge and discharge control module (302), and a battery (303) electrically connected in series; The first interface (301) is configured to be connected to a load or a charging power source, the first current acquisition module (101) is connected between the first interface (301) and the battery (303), and the first current acquisition module (101) is configured to acquire the current of the main circuit (300) flowing through the load.

3. The SOC detection circuit of the battery management system according to claim 2, wherein: The first current acquisition module (101) comprises: a first sampling resistor (1011); The first end of the first sampling resistor (1011) is connected to the first interface (301) and the first sampling end (1031) of the calculation module (103), and the second end of the first sampling resistor (1011) is connected to the second electrode of the battery (303) and the second sampling end (1032) of the calculation module (103).

4. The SOC detection circuit of the battery management system according to any one of claims 1 to 3, wherein: The control circuit (200) is connected to a battery (303) of the main circuit (300), and the battery (303) is configured to supply power to the control circuit (200); the second current acquisition module (102) is connected between a ground terminal of the control circuit (200) and a second pole of the battery (303), and is configured to acquire a self-consumption current of the control circuit (200).

5. The SOC detection circuit of the battery management system according to claim 4, wherein: The second current acquisition module (102) comprises: a second sampling resistor (1021); The first end of the second sampling resistor (1021) is connected to the second electrode of the battery (303) and the third sampling end (1033) of the calculation module (103), and the second end of the second sampling resistor (1021) is connected to the fourth sampling end (1034) of the calculation module (103) and the ground end.

6. The SOC detection circuit of the battery management system according to any one of claims 1 to 5, wherein: The calculation module (103) comprises: an analog-to-digital conversion unit (1035), connected to the first current acquisition module (101) and the second current acquisition module (102), respectively, and configured to convert the first current information and the second current information into digital signals; A signal processing unit (1036) is connected to the analog-to-digital conversion unit (1035) and is configured to calculate the SOC value of the battery management system based on the first current information and the second current information converted into digital signals.

7. A charge and discharge control circuit, comprising: A calculation module (103) is configured to generate a first control signal and a second control signal in response to an operation instruction of a target user; A charging control module (105), connected to the calculation module (103), and configured to generate a charging control voltage in response to the first control signal; A discharge control module (106), connected to the calculation module (103), and configured to generate a discharge control voltage in response to the second control signal; The charging control voltage is configured to control the charging switch tube (M1) to be turned on or off; and the discharging control voltage is configured to control the discharging switch tube (M2) to be turned on or off.

8. The charge and discharge control circuit according to claim 7, wherein: The charging control module (105) comprises: A first follower unit (1051), connected to the computing module (103), the first follower unit (1051) being configured to receive a first control signal and output the first control signal; A first driving unit (1052) connected to the first following unit (1051), the first driving unit (1052) being configured to be turned on according to the first control signal and to drive the module to output a first power signal; A first switch unit (1053) connected to the first drive unit (1052), the first switch unit (1053) being configured to be turned on according to the first power signal; A first output unit (1054) is connected to the first switch unit (1053), and the first output unit (1054) is configured to output a charging control voltage.

9. The charge and discharge control circuit according to claim 8, wherein: The first driving unit (1052) comprises: a first switch tube (Q1), a second switch tube (Q2), a first resistor (R1), a second resistor (R2), a third resistor (R3) and a fourth resistor (R4); Wherein, the first end of the first resistor (R1) is connected to the output end of the first follower unit (1051), the second end of the first resistor (R1) is connected to the control end of the first switch tube (Q1), the first electrode of the first switch tube (Q1) is connected to the control end of the second switch tube (Q2), and the second electrode of the first switch tube (Q1) is grounded; the first electrode of the second switch tube (Q2) is configured to be connected to the first power supply input end, and the second electrode of the second switch tube (Q2) is connected to the control end of the first switch unit (1053); The second resistor (R2) is connected between the control end and the second pole of the first switch tube (Q1); the third resistor (R3) is connected between the first pole of the first switch tube (Q1) and the control end of the second switch tube (Q2); and the fourth resistor (R4) is connected between the control end of the second switch tube (Q2) and the first pole of the second switch tube (Q2).

10. The charge and discharge control circuit according to claim 8, wherein: The first switch unit (1053) comprises: a third switch tube (Q3) and a fifth resistor (R5); The control end of the third switch tube (Q3) is connected to the output end of the first drive unit (1052), the first electrode of the third switch tube (Q3) is connected to the first end of the first output unit (1054), and the second electrode of the third switch tube (Q3) is grounded; and the fifth resistor (R5) is connected between the control end and the second electrode of the third switch tube (Q3).

11. The charge and discharge control circuit according to claim 10, wherein: The first output unit (1054) comprises: a first voltage divider network, wherein a first end of the first voltage divider network is connected to a first pole of the third switch tube (Q3), a second end of the first voltage divider network is configured to be connected to a second power supply input end, and a third end of the first voltage divider network is configured to be connected to a control end of a charging switch tube (M1).

12. The charge and discharge control circuit according to any one of claims 7 to 11, wherein: The discharge control module (106) comprises: A second follower unit (1061), connected to the computing module (103), the second follower unit (1061) being configured to receive a second control signal and output the second control signal; A second driving unit (1062) connected to the second following unit (1061), the second driving unit (1062) being configured to be turned on according to the second control signal and to output a first power signal; a second switch unit (1063), connected to the second drive unit (1062), the second switch unit (1063) being configured to be turned on according to the first power signal; The second output unit (1064) is connected to the second switch unit (1063), and the second output unit (1064) is configured to output a discharge control voltage.

13. The charge and discharge control circuit according to claim 12, wherein: The second driving unit (1062) comprises: a fourth switch tube (Q4), a fifth switch tube (Q5), a sixth resistor (R6), a seventh resistor (R7), an eighth resistor (R8) and a ninth resistor (R9); Wherein, the first end of the sixth resistor (R6) is connected to the output end of the second follower unit (1061), the second end of the sixth resistor (R6) is connected to the control end of the fourth switch tube (Q4), the first electrode of the fourth switch tube (Q4) is connected to the control end of the fifth switch tube (Q5), and the second electrode of the fourth switch tube (Q4) is grounded; the first electrode of the fifth switch tube (Q5) is configured to be connected to the first power supply input end, and the second electrode of the fifth switch tube (Q5) is connected to the control end of the second switch unit (1063); The seventh resistor (R7) is connected between the control end and the second pole of the fourth switch tube (Q4); the eighth resistor (R8) is connected between the first pole of the fourth switch tube (Q4) and the control end of the fifth switch tube (Q5); and the ninth resistor (R9) is connected between the control end of the fifth switch tube (Q5) and the first pole of the fifth switch tube (Q5).

14. The charge and discharge control circuit according to claim 12, wherein: The second switch unit (1063) comprises: a sixth switch tube (Q6) and a tenth resistor (R10); The control end of the sixth switch tube (Q6) is connected to the output end of the second drive unit (1062), the first electrode of the sixth switch tube (Q6) is connected to the first end of the second output unit (1064), and the second electrode of the sixth switch tube (Q6) is grounded; and the tenth resistor (R10) is connected between the control end and the second electrode of the sixth switch tube (Q6).

15. The charge and discharge control circuit according to claim 14, wherein: The second output unit (1064) comprises: a second voltage divider network, wherein a first end of the second voltage divider network is connected to a first pole of the sixth switch tube (Q6), a second end of the second voltage divider network is configured to be connected to a second power supply input end, and a third end of the second voltage divider network is configured to be connected to a control end of a discharge switch tube (M2).

16. The charge and discharge control circuit according to any one of claims 7 to 15, wherein: The charge and discharge control circuit further includes: an initialization module (107); The input end of the initialization module (107) is connected to the first power supply input end, and the output end of the initialization module (107) is connected to the charging control module (105) and the discharging control module (106); The initialization module (107) is configured to initialize the charging control module (105) and the discharging control module (106) in an initial stage, and control the charging switch tube (M1) to be turned off, and control the discharging switch tube (M2) to be turned off.

17. The charge and discharge control circuit according to claim 16, wherein: The initialization module (107) comprises: a first capacitor (C1), an eleventh resistor (R11) and a twelfth resistor (R12); The first end of the first capacitor (C1) is connected to the first power input end, the second end of the first capacitor (C1) is connected to the first end of the eleventh resistor (R11) and the first end of the twelfth resistor (R12), the second end of the eleventh resistor (R11) is grounded, and the second end of the twelfth resistor (R12) is connected to the reset end of the first follower unit (1051) of the charging control module (105) and the reset end of the second follower unit (1061) of the discharging control module (106).

18. A boost control circuit, comprising: A calculation module (103) is configured to generate a first control signal and a second control signal in response to an operation instruction of a target user; A driving module (108) connected to the computing module (103) and the first power supply terminal, the driving module (108) being configured to generate a switch control signal and a first voltage driving signal in response to the first control signal and the second control signal; A switch module (109) connected to the second power supply terminal and the driving module (108), the switch module (109) being configured to be turned on or off in response to the switch control signal; a boost module (110) connected to the switch module (109) and the drive module (108), the boost module (110) being configured to receive a second power supply signal from the second power supply terminal when the switch module (109) is turned on, and to boost the voltage according to the second power supply signal and the first voltage drive signal, thereby outputting a second voltage signal; Wherein, the amplitude of the second voltage signal is greater than the amplitude of the second power supply signal.

19. The boost control circuit according to claim 18, wherein: The driving module (108) comprises: An input logic module (1081), connected to the calculation module (103), and configured to generate a first logic control signal according to the first control signal and the second control signal; A first driving module (1082), connected to the input logic module (1081) and the switch module (109), and configured to be turned on according to the first logic control signal, and to output a switch control signal to the switch module (109); a second driving module (1083), connected to the input logic module (1081) and the first power supply terminal, and configured to output a first driving signal according to the first logic control signal and a first power supply signal output by the first power supply terminal; An output logic module (1084) is connected to the second driving module (1083), and the output logic module (1084) is configured to generate the first voltage driving signal according to the first driving signal.

20. The boost control circuit according to claim 19, wherein: The first driving module (1082) comprises: a seventh switch tube (Q7), an eighth switch tube (Q8) and a thirteenth resistor (R13); The control end of the seventh switch tube (Q7) is connected to the output end of the input logic module (1081), the first electrode of the seventh switch tube (Q7) is connected to the control end of the eighth switch tube (Q8) and the first end of the thirteenth resistor (R13), the second end of the thirteenth resistor (R13) is configured to be connected to the first power supply end, the first electrode of the eighth switch tube (Q8) is connected to the control end of the switch module (109), and the second electrode of the seventh switch tube (Q7) and the second electrode of the eighth switch tube (Q8) are grounded.

21. The boost control circuit according to claim 19, wherein: The second driving module (1083) comprises: a ninth switch tube (Q9), a tenth switch tube (Q10), an eleventh switch tube (Q11), a fourteenth resistor (R14) and a fifteenth resistor (R15); The control end of the ninth switch tube (Q9) is connected to the output end of the input logic module (1081); the first electrode of the ninth switch tube (Q9) is connected to the control end of the tenth switch tube (Q10) and the first end of the fourteenth resistor (R14); the second end of the fourteenth resistor (R14) is connected to the first power supply end; the first electrode of the tenth switch tube (Q10) is connected to the control end of the eleventh switch tube (Q11) and the first end of the fifteenth resistor (R15); the second end of the fifteenth resistor (R15) is connected to the first electrode of the eleventh switch tube (Q11) and the first power supply end; the second electrode of the ninth switch tube (Q9) and the second electrode of the tenth switch tube (Q10) are grounded; the second electrode of the eleventh switch tube (Q11) is connected to the output logic module (1084) as the output end of the second driving module (1083).

22. The boost control circuit according to claim 19, wherein: The input logic module (1081) comprises: a first AND gate (U1); The first input end of the first AND gate (U1) is connected to the computing module (103) to be configured to input the first control signal, the second input end of the first AND gate (U1) is connected to the computing module (103) to be configured to input the second control signal, and the output end of the first AND gate (U1) is connected to the first driving module (1082) and the second driving module (1083).

23. The boost control circuit according to claim 19, wherein: The output logic module (1084) comprises: a second AND gate (U2), a fifth capacitor (C5) and a sixteenth resistor (R16); The first input end of the second AND gate (U2) is connected to the output end of the second driving module (1083), the second input end of the second AND gate (U2) is connected to the first end of the fifth capacitor (C5) and the first end of the sixteenth resistor (R16), the second end of the fifth capacitor (C5) is grounded, the second end of the sixteenth resistor (R16) is connected to the output end of the second AND gate (U2), and the output end of the second AND gate (U2) is configured to output the first voltage driving signal.

24. The boost control circuit according to claim 18, wherein: The boost module (110) comprises: A first-stage boost unit (111), wherein an input end of the first-stage boost unit (111) is connected to an output end of the driving module (108), an output end of the first-stage boost unit (111) and an output end of the switch module (109) are connected to a first node, and the first-stage boost unit (111) is configured to perform a first-stage boost on a voltage at the first node; the first node is connected to an output interface of the boost control circuit; a second-stage boost unit (112), the second-stage boost unit (112) being connected between the first-stage boost unit (111) and the first node, the second-stage boost unit (112) being configured to perform a second-stage boost on the voltage of the first node; The output interface is configured to output the second voltage signal after the second stage of boosting.

25. The boost control circuit according to claim 24, wherein: The first-stage boost unit (111) comprises: a first inverter (U3), a sixth capacitor (C6) and a seventeenth resistor (R17); The input end of the first inverter (U3) is connected to the output end of the driving module (108), the output end of the first inverter (U3) is connected to the first end of the sixth capacitor (C6), the second end of the sixth capacitor (C6) is connected to the first end of the seventeenth resistor (R17), and the second end of the seventeenth resistor (R17) is connected to the output interface.

26. The boost control circuit according to claim 25, wherein: The second-stage boost unit (112) comprises: a second inverter (U4), a seventh capacitor (C7) and an eighteenth resistor (R18); The input end of the second inverter (U4) is connected to the output end of the first inverter (U3), the output end of the second inverter (U4) is connected to the first end of the seventh capacitor (C7), the second end of the seventh capacitor (C7) is connected to the first end of the eighteenth resistor (R18), and the second end of the eighteenth resistor (R18) is connected to the output interface.

27. The boost control circuit according to any one of claims 18 to 26, further comprising: Surge control module (120); The surge control module (120) is connected between the switch module (109) and the boost module (110), and the surge control module (120) is connected to the calculation module (103); the surge control module (120) is configured to be turned on in response to a third control signal of the calculation module (103) to reduce the surge of the boost control circuit.

28. The boost control circuit according to claim 27, wherein: The surge control module (120) comprises: a current limiting resistor (R19), a twelfth switch tube (Q12), a thirteenth switch tube (Q13), an eighth capacitor (C8), a third voltage divider network and a fourth voltage divider network; Wherein, the current limiting resistor (R19) is connected between the switch module (109) and the boost module (110); The first electrode of the twelfth switch tube (Q12) is connected to the switch module (109) and the first end of the third voltage divider network, the second electrode of the twelfth switch tube (Q12) is connected to the boost module (110) and the first end of the eighth capacitor (C8), and the second end of the eighth capacitor (C8) is grounded; The control end of the twelfth switch tube (Q12) is connected to the second end of the third voltage-dividing network, the third end of the third voltage-dividing network is connected to the first electrode of the thirteenth switch tube (Q13), and the second electrode of the thirteenth switch tube (Q13) is grounded; The control end of the thirteenth switch tube (Q13) is connected to the second end of the fourth voltage divider network, the first end of the fourth voltage divider network is connected to the calculation module (103), and the third end of the fourth voltage divider network is grounded.

29. A switch tube detection circuit of a battery management system, the battery management system comprising: A battery (303), a charging switch module (130), a discharging switch module (140) and a charging and discharging interface (104); the charging and discharging interface (104) and the charging switch module (130) are connected to a first detection terminal (TP30), the charging switch module (130) and the discharging switch module (140) are connected to a second detection terminal (S0), and the discharging switch module (140) and the battery (303) are connected to a third detection terminal (PACK_POS); The switch tube detection circuit of the battery management system includes: A calculation module (103) configured to generate a first control signal and a second control signal; A first acquisition module (150) connected to the calculation module (103) and the second detection terminal (S0), the first acquisition module (150) being configured to acquire a second voltage signal of the second detection terminal (S0) according to the first control signal; a second acquisition module (160) connected to the calculation module (103) and the first detection terminal (TP30) and the third detection terminal (PACK_POS), the second acquisition module (160) being configured to acquire a first voltage signal of the first detection terminal (TP30) and a third voltage signal of the third detection terminal (PACK_POS) according to the second control signal; The calculation module (103) is further configured to determine the fault status of the charging switch module (130) and the discharging switch module (140) according to the first voltage signal, the second voltage signal and the third voltage signal.

30. The switch tube detection circuit of the battery management system according to claim 29, wherein: The charging switch module (130) comprises: N charging switch tubes, where N is a positive integer greater than or equal to 1; the discharging switch module (140) comprises: N discharging switch tubes and N bypass resistors; Wherein, the second detection end (S0) includes: N nodes, the Nth charging switch tube and the Nth discharging switch tube are connected to the Nth node, and the Nth bypass resistor is connected in parallel between the first electrode and the second electrode of the Nth discharging switch tube; The first acquisition module (150) comprises: N sampling units, the control ends of the N sampling units are connected to the first enable end of the calculation module (103), the input end of the Nth sampling unit is connected to the Nth node; the output end of the Nth sampling unit is respectively connected to the Nth input end of the calculation module (103).

31. The switch tube detection circuit of the battery management system according to claim 30, wherein: The sampling unit comprises: a fourteenth switch tube (Q14), a fifteenth switch tube (Q15), a fifth voltage divider network, a sixth voltage divider network and a twentieth resistor (R20); The control end of the fourteenth switch tube (Q14) is connected to the first enable end of the calculation module (103), the first end and the second end of the fifth voltage divider network are connected between the control end of the fourteenth switch tube (Q14) and the first enable end of the calculation module (103), and the third end of the fifth voltage divider network and the second electrode of the fourteenth switch tube (Q14) are connected to the ground end; The first electrode of the fourteenth switch tube (Q14) is connected to the control end of the fifteenth switch tube (Q15), the first electrode of the fifteenth switch tube (Q15) is connected to the second detection end (S0), the first end and the second end of the sixth voltage divider network are connected between the control end of the fifteenth switch tube (Q15) and the first electrode of the fourteenth switch tube (Q14), the third end of the sixth voltage divider network is connected to the first electrode of the fifteenth switch tube (Q15), the second electrode of the fifteenth switch tube (Q15) is connected to the first end of the twentieth resistor (R20) and the first input end of the calculation module (103); and the second end of the twentieth resistor (R20) is grounded.

32. The switch tube detection circuit of the battery management system according to claim 31, wherein: The sampling unit further includes: a current limiting resistor; Wherein, the current limiting resistor is connected between the first electrode of the fifteenth switch tube (Q15) and the second detection end (S0).

33. The switch tube detection circuit of the battery management system according to any one of claims 29 to 32, wherein: The second acquisition module (160) comprises: a first switch module (161), a second switch module (162), a third switch module (163) and a differential module (164); Wherein, the control end of the first switch module (161) is connected to the second enable end of the computing module (103), and the first end of the first switch module (161) is connected to the control end of the second switch module (162) and the control end of the third switch module (163); the second end of the first switch module (161) is grounded, and the first switch module (161) is configured to control the second switch module (162) and the third switch module (163) to be turned on according to a second control signal; The first end of the second switch module (162) is connected to the first detection end (TP30), and the second end of the second switch module (162) is connected to the first input end of the differential module (164); the second switch module (162) is configured to output the collected first voltage signal to the differential module (164); The first end of the third switch module (163) is connected to the third detection end (PACK_POS), and the second end of the third switch module (163) is connected to the second input end of the differential module (164); the third switch module (163) is configured to output the collected third voltage signal to the differential module (164); The output end of the differential module (164) is connected to the second input end of the calculation module (103), and the differential module (164) is configured to perform differential calculation based on the received first voltage signal and the third voltage signal, and output the differential signal to the calculation module (103).

34. The switch tube detection circuit of the battery management system according to claim 33, wherein: The first switch module (161) comprises: a sixteenth switch tube (Q16), a twenty-first resistor (R21) and a twenty-second resistor (R22); Wherein, the control end of the sixteenth switch tube (Q16) is connected to the first end of the twenty-first resistor (R21), and the second end of the twenty-first resistor (R21) serves as the control end of the first switch module (161); The twenty-second resistor (R22) is connected between the control terminal and the second electrode of the sixteenth switch tube (Q16), and the second electrode of the sixteenth switch tube (Q16) is connected to the ground terminal; The first electrode of the sixteenth switch tube (Q16) serves as the first end of the first switch module (161).

35. The switch tube detection circuit of the battery management system according to claim 34, wherein: The second switch module (162) comprises: a seventeenth switch tube (Q17), a twenty-third resistor (R23), a twenty-fourth resistor (R24) and a twenty-fifth resistor (R25); The control end of the seventeenth switch tube (Q17) is connected to the first end of the twenty-third resistor (R23) and the first end of the twenty-fourth resistor (R24), and the second end of the twenty-third resistor (R23) serves as the control end of the second switch module (162); the second end of the twenty-fourth resistor (R24) is connected to the first electrode of the seventeenth switch tube (Q17) and serves as the first end of the second switch module (162); the second electrode of the seventeenth switch tube (Q17) is connected to the first end of the twenty-fifth resistor (R25), and the second end of the twenty-fifth resistor (R25) serves as the second end of the second switch module (162).

36. The switch tube detection circuit of the battery management system according to claim 34, wherein: The third switch module (163) comprises: an eighteenth switch tube (Q18), a twenty-sixth resistor (R26), a twenty-seventh resistor (R27) and a twenty-eighth resistor (R28); The control end of the eighteenth switch tube (Q18) is connected to the first end of the twenty-sixth resistor (R26) and the first end of the twenty-seventh resistor (R27), and the second end of the twenty-sixth resistor (R26) serves as the control end of the third switch module (163); the second end of the twenty-seventh resistor (R27) is connected to the first electrode of the eighteenth switch tube (Q18) and serves as the first end of the third switch module (163); the second electrode of the eighteenth switch tube (Q18) is connected to the first end of the twenty-eighth resistor (R28), and the second end of the twenty-eighth resistor (R28) serves as the second end of the third switch module (163).

37. The switch tube detection circuit of the battery management system according to any one of claims 29 to 36, wherein: When the battery (303) is charged, the calculation module (103) is configured to respectively compare the first voltage signal with a first preset threshold, compare the second voltage signal with a second preset threshold, and compare the third voltage signal with a third preset threshold, to determine whether a short circuit or open circuit fault occurs in the charging switch module (130) and the discharging switch module (140); When the battery (303) is discharging, the calculation module (103) is configured to compare the first voltage signal with a fourth preset threshold, compare the second voltage signal with a fifth preset threshold, and compare the third voltage signal with a sixth preset threshold, respectively, to determine whether a short circuit or open circuit fault occurs in the charging switch module (130) and the discharging switch module (140).

38. A battery management system comprising: Main circuit (300); Control loop (200); The SOC detection circuit of the battery management system according to any one of claims 1 to 6; The SOC detection circuit of the battery management system is connected to the main circuit (300) and the control circuit (200) respectively, and the SOC detection circuit of the battery management system is configured to detect the total SOC value of the main circuit (300) and the control circuit (200).

39. The battery management system according to claim 38, wherein: The main circuit (300) comprises: a first interface (301), a charge and discharge control module (302) and a battery connected in series, and the control circuit (200) comprises: a control module (201) and a switch drive module (202); The first interface (301) is configured to connect a load or a charging power source; the control module (201) is connected to the switch drive module (202), and the switch drive module (202) is configured to generate a drive signal according to a control signal of the control module (201); the drive signal is configured to control the charge and discharge control module (302) to be turned on or off; the control module (201) is connected to the battery, and the battery is configured to supply power to the control module (201).

40. A battery management system comprising: The charge and discharge control circuit of any one of claims 7 to 17, or the boost control circuit of any one of claims 18 to 28, or the switch tube detection circuit of the battery management system of any one of claims 29 to 37.

41. An electric vehicle comprising: The SOC detection circuit of the battery management system according to any one of claims 1 to 6, or the charge and discharge control circuit according to any one of claims 7 to 17, or the boost control circuit according to any one of claims 18 to 28, or the switch tube detection circuit of the battery management system according to any one of claims 29 to 37, or the battery management system according to any one of claims 38 to 39, or the battery management system according to claim 40.

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