BMS anti-sparking device

Abstract

The utility model discloses a BMS anti-sparking device comprising a temperature monitoring module used for monitoring the temperature of a battery and an MOS tube in a battery pack in real time, and when the temperature exceeds a preset threshold value, a main control module cuts off a power supply; the short-circuit protection module detects the voltage change of the discharge end to identify whether a short circuit occurs, and when the short circuit is detected, the main control module cuts off the power supply; the reverse connection protection module is used for detecting whether the battery pack is reversely connected or not, and the main control module cuts off the power supply under the reverse connection condition; the current and voltage monitoring module monitors changes of current and voltage of the battery pack at the same time, and when the current or the voltage is abnormal, the main control module cuts off the power supply; the MOS adhesion fault detection module is used for detecting whether an adhesion fault exists in the MOS tube or not, and when the fault is found, the main control module cuts off the power supply; the system also comprises an AFE chip fault detection module and a circuit breaker. By implementing the device provided by the utility model, the sparking phenomenon can be effectively avoided, and the safe operation of the battery system is ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery management system technical field especially relates to a BMS anti -spark device. BACKGROUND

[0002] With the rapid development of emerging application fields such as electric vehicles and energy storage systems, the safety problem of lithium batteries as core energy storage and driving units is increasingly concerned. Lithium batteries have the advantages of high energy density and fast charging speed, but in the use environment of high power demand and frequent charging and discharging, the problems of battery overheating, short circuit, overcharge and the like may cause safety hazards. Especially under extreme conditions, if the battery management system fails to effectively respond to sudden abnormal states, the battery may produce a spark phenomenon, i.e. high temperature or sparks inside or outside the battery, which may trigger thermal runaway of the battery and even cause fire or explosion accidents.

[0003] Although the traditional battery management system has certain protection functions, such as overcharge, overdischarge, overtemperature protection mechanism, it can monitor and adjust the basic safety state of the battery, but in some specific cases, the protection measures of the existing battery management system may not be able to completely prevent the battery from sparking. For example, when the battery is in high load, fast charging and discharging or aging process, voltage imbalance between battery monomers occurs, or when electrical connection fault occurs in the battery system, local overheating or current impact may occur, which may trigger sparks or sparks. This sparking phenomenon not only affects the life of the battery itself, leading to capacity attenuation and performance degradation, but in severe cases, it may also cause greater safety hazards, posing a threat to the personal safety and property safety of the user. Therefore, it is crucial to improve the safety of lithium battery systems, especially at the level of battery management system.

[0004] Therefore, it is necessary to design a new device that can automatically take protective measures in the case of temperature anomaly, short circuit, reverse connection, current and voltage anomaly, MOS adhesion fault and AFE chip fault, effectively prevent the occurrence of sparking phenomenon and ensure the safe operation of the battery system. UTILITY MODEL CONTENT

[0005] The utility model aims at overcoming the defects of prior art and providing a BMS anti -spark device.

[0006] To solve the above technical problems, the utility model aims at realizing the following technical scheme: providing a BMS anti -spark device, comprising: a main control module, a temperature monitoring module, a short circuit protection module, a reverse connection protection module, a current and voltage monitoring module, a MOS adhesion fault detection module, an AFE chip fault detection module and a circuit breaker.

[0007] The temperature monitoring module is configured to monitor the temperature of the battery and the MOS tube in the battery pack in real time, and cut off the power supply by the main control module when the temperature exceeds a preset threshold.

[0008] The short circuit protection module is configured to detect whether a short circuit occurs by detecting the voltage change of the discharge end, and cut off the power supply by the main control module when the short circuit is detected.

[0009] The reverse connection protection module is configured to detect whether a reverse connection occurs in the battery pack, and cut off the power supply by the main control module in the case of reverse connection.

[0010] The current and voltage monitoring module is configured to monitor the changes of the current and voltage of the battery pack at the same time, and cut off the power supply by the main control module when the current or voltage is abnormal.

[0011] The MOS sticking fault detection module is configured to detect whether the MOS tube has a sticking fault, and cut off the power supply by the main control module when the fault is found.

[0012] The AFE chip fault detection module is configured to detect the working state of the AFE chip, and cut off the power supply by the main control module if the chip is faulty.

[0013] The circuit breaker is configured to automatically cut off the charging and discharging circuit of the battery pack by the main control module when the MOS tube fault is detected.

[0014] A further technical solution is that the temperature monitoring module includes a temperature sensor, and the temperature sensor is built-in in the battery pack.

[0015] A further technical solution is that the temperature monitoring sensor includes a four-way battery pack temperature acquisition circuit and a two-way MOS temperature acquisition circuit, and the four-way battery pack temperature acquisition circuit and the two-way MOS temperature acquisition circuit are connected with the temperature sensor respectively; the four-way battery pack temperature acquisition circuit and the two-way MOS temperature acquisition circuit are connected with the main control module respectively.

[0016] A further technical solution is that the reverse connection protection module includes a comparator USM1, and the comparator USM1 is connected with the battery pack and the main control module respectively.

[0017] A further technical solution is that the current and voltage monitoring module includes a current sensor, a voltage sensor, and a voltage and current acquisition module, the current sensor and the voltage sensor are connected with the battery pack respectively, and the voltage and current acquisition module is connected with the current sensor and the voltage sensor respectively; the voltage and current acquisition module is connected with the main control module.

[0018] A further technical scheme is that the MOS sticking fault detection module comprises an LDO voltage acquisition circuit, the LDO voltage acquisition circuit is connected with the MOS tube, and the LDO voltage acquisition circuit is connected with the main control module.

[0019] A further technical scheme is that the circuit breaker comprises an automatic reset circuit breaker.

[0020] A further technical scheme is that the circuit breaker comprises an automatic reset circuit breaker.

[0021] The utility model discloses a BMS anti -arcing device, which belongs to the field of battery management system (BMS) and relates to a kind of battery system safety protection device.

[0022] The utility model discloses a BMS anti -arcing device, which belongs to the field of battery management system (BMS) and relates to a kind of battery system safety protection device. DESCRIPTION OF DRAWINGS

[0023] In order to more clearly illustrate the technical scheme of the utility model embodiment, the following will be briefly introduced to the drawing needed to be used in embodiment description, obviously, the drawing in the following description is some embodiments of the utility model, for those skilled in the art, without creative labor, can also obtain other drawings according to these drawings.

[0024] Figure 1 A schematic structural block diagram of the BMS anti-arcing device is provided for the utility model embodiment.

[0025] Figure 2 The specific circuit principle of the temperature monitoring module is provided for the utility model embodiment. Figure 1 ;

[0026] Figure 3 The specific circuit principle of the temperature monitoring module is provided for the utility model embodiment. Figure 2 ;

[0027] Figure 4 The specific circuit principle diagram of the short-circuit protection module is provided for the utility model embodiment.

[0028] Figure 5 The specific circuit principle diagram of the reverse connection protection module provided by the utility model embodiment is provided;

[0029] Figure 6 The specific circuit principle diagram of the current voltage monitoring module provided by the utility model embodiment is provided;

[0030] Figure 7 The specific circuit principle diagram of the MOS adhesion fault detection module provided by the utility model embodiment is provided;

[0031] Figure 8 The specific circuit principle diagram of the circuit breaker provided by the utility model embodiment is provided;

[0032] The identification in the figure is explained:

[0033] 10, main control module; 20, temperature monitoring module; 30, short circuit protection module; 40, reverse connection protection module; 50, current voltage monitoring module; 60, MOS adhesion fault detection module; 70, AFE chip fault detection module; 80, circuit breaker. DETAILED DESCRIPTION

[0034] The technical scheme in the utility model embodiments will be clearly and completely described below with reference to the drawings in the utility model embodiments. Obviously, the described embodiments are part of the embodiments of the utility model and not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0035] It should be understood that when used in the specification and the appended claims, the terms "comprise" and "include" indicate the presence of described features, whole, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, whole, steps, operations, elements, components and / or sets thereof.

[0036] It should also be understood that the terms used in this utility model specification are only for the purpose of describing specific embodiments and are not intended to limit the utility model. As used in the utility model specification and the appended claims, unless the context clearly indicates otherwise, the singular form "a", "an" and "the" is intended to include the plural form.

[0037] It should be further understood that the term "and / or" used in the utility model specification and the appended claims means one or more of the associated listed items and all possible combinations, and includes these combinations.

[0038] With the rapid development of electric vehicles and energy storage systems, the safety of lithium batteries has attracted increasing attention. Lithium batteries have high energy density and fast charging advantages, but in high-power and frequent charging and discharging environments, they are prone to overheating, short-circuiting, and overcharging, among other safety hazards. Especially in extreme conditions, when the battery management system fails to effectively respond to abnormal states, it may trigger a sparking phenomenon, leading to battery thermal runaway and even explosion. Although existing battery management systems have some protection functions, they may not be able to completely prevent sparking problems during high load, rapid charging and discharging, or battery aging. Improving the safety of battery management systems is crucial to ensuring the safe use of lithium batteries.

[0039] To this end, the BMS anti-sparking device provided by the embodiments of the present application can automatically take protective measures in various situations such as temperature abnormalities, short circuits, reverse connections, current and voltage abnormalities, MOS adhesion faults, and AFE chip faults, effectively preventing sparking phenomena and ensuring the safe operation of the battery system.

[0040] Specifically, the BMS anti-sparking device achieves multiple protection through multiple monitoring modules and protection mechanisms. The temperature monitoring module 20 monitors the temperature of the battery and MOS tube in real time and automatically cuts off the power supply when the temperature is too high. The short-circuit protection module 30 detects short circuits by voltage changes and cuts off the power supply. The reverse connection protection module 40 detects battery reverse connection and cuts off the power supply if reverse connection occurs. The current and voltage monitoring module 50 monitors the battery current and voltage in real time and automatically cuts off the power supply when abnormal. The MOS adhesion fault detection and AFE chip fault detection module 70 monitors the working state of the related circuit and cuts off the power supply in time to prevent system failure. In addition, the circuit breaker 80 and the fuse further enhance the safety of the system.

[0041] In order to better understand the above technical solutions, the above technical solutions will be described in detail below in conjunction with the drawings and specific embodiments of the specification.

[0042] Please refer to Figure 1 A BMS anti-sparking device, comprising: a main control module 10, a temperature monitoring module 20, a short-circuit protection module 30, a reverse connection protection module 40, a current and voltage monitoring module 50, a MOS adhesion fault detection module 60, an AFE chip fault detection module 70, and a circuit breaker 80;

[0043] The temperature monitoring module 20 is configured to monitor the temperature of the battery and the MOS tube in the battery pack in real time, and to cut off the power supply by the main control module 10 when the temperature exceeds a predetermined threshold;

[0044] The short-circuit protection module 30 is configured to detect voltage changes at the discharge end to identify whether a short circuit has occurred, and to cut off the power supply by the main control module 10 when a short circuit is detected;

[0045] Reverse connection protection module 40 for detecting whether the battery pack is reversed, and cutting off the power supply by the main control module 10 in the case of reverse connection;

[0046] Current and voltage monitoring module 50 for monitoring the changes of battery pack current and voltage at the same time, and cutting off the power supply by the main control module 10 when the current or voltage is abnormal;

[0047] MOS sticking fault detection module 60 for detecting whether the MOS tube has sticking fault, and cutting off the power supply by the main control module 10 when the fault is found;

[0048] AFE chip fault detection module 70 for detecting the working state of the AFE chip, and cutting off the power supply by the main control module 10 if the chip is faulty;

[0049] Circuit breaker 80 for automatically cutting off the charging and discharging circuit of the battery pack by the main control module 10 when the MOS tube fault is detected.

[0050] In this embodiment, the temperature inside the battery may rise rapidly during high load or rapid charging and discharging, especially when the voltage between battery monomers is unbalanced or the electrical connection fails, the local overheating problem is more serious. The temperature monitoring module 20 monitors the temperature of the battery and MOS tube in the battery pack in real time, and sets a threshold value. When the temperature exceeds the preset threshold value, the main control module 10 cuts off the power supply to prevent the sparking phenomenon caused by overheating. Through accurate temperature monitoring and timely power-off, local overheating-induced internal short circuit or thermal runaway of the battery is avoided, and the risk of spark generation is reduced.

[0051] Short circuit fault usually causes the internal current of the battery pack to change dramatically, resulting in current impact or spark, and may even cause a fire. The short circuit protection module 30 detects whether a short circuit occurs by detecting the change of the discharge end voltage. When a short circuit occurs, the main control module 10 will immediately cut off the power supply. The rapid response and power-off can effectively prevent the spark, thermal runaway and other problems caused by short circuit, especially in the high load charging and discharging environment.

[0052] When installing the battery, if the reverse connection problem occurs, it may cause the internal electrical connection of the battery to be abnormal, resulting in short circuit or current impact, and thus causing sparks. The reverse connection protection module 40 detects whether the battery pack is reversed, and cuts off the power supply by the main control module 10 when the reverse connection is detected. By preventing the occurrence of reverse connection, the electrical fault or spark caused by incorrect wiring is avoided, ensuring the safety of the system.

[0053] If the current or voltage of the battery is abnormal during charging and discharging (such as single battery imbalance, connection problem), it will cause some batteries to be overcharged or overdischarged, and then generate heat and sparks. The current and voltage monitoring module 50 monitors the current and voltage changes of the battery pack at the same time. When the current or voltage is abnormal, the main control module 10 cuts off the power supply to avoid battery overload. It can timely find the voltage imbalance between the battery monomers, prevent the battery from being overcharged, overdischarged or current impact, and cause sparks or thermal runaway.

[0054] In the battery system, MOS tube (as a current control switch) may have a sticking fault, causing the current to be unable to be normally cut off, thereby generating an overcurrent condition, which may cause sparks or overheating. The MOS sticking fault detection module 60 is used to detect whether the MOS tube has a sticking fault, and when the fault occurs, the main control module 10 will cut off the power supply. Timely detection of MOS tube failure can prevent electrical sparks caused by excessive current or improper switching and ensure the safety of the battery management system.

[0055] The AFE (analog front end) chip is one of the core components in the battery management system, responsible for collecting and processing information such as battery voltage, current, temperature, etc. If the AFE chip fails, it may cause the monitoring system to fail, thereby failing to timely detect abnormal battery conditions. The AFE chip fault detection module 70 can detect the working state of the AFE chip in real time, and if the chip fails, the main control module 10 cuts off the power supply. By detecting the working state of the AFE chip, it ensures that the monitoring system is always in a normal working state, preventing safety hazards caused by chip failure.

[0056] When the battery system fails (such as MOS tube failure), the charging and discharging circuit of the battery pack needs to be quickly cut off to avoid the spread of the fault or cause more serious safety problems. The circuit breaker 80 is used to automatically cut off the charging and discharging circuit of the battery pack when the MOS tube fault is detected by the main control module 10. By timely cutting off the charging and discharging circuit of the battery pack, the spread of internal battery faults can be avoided, and the risk of system fire or explosion can be reduced.

[0057] By comprehensively applying the above multiple protection modules, the BMS anti-sparking device can effectively deal with various potential risks in the battery system. For example, temperature monitoring, short circuit protection, reverse connection protection, etc. provide timely response under high load or fault conditions to avoid battery sparking due to overheating, current impact, electrical connection problems, etc. MOS sticking fault detection and AFE chip fault detection further ensure the reliability and accuracy of the battery management system, preventing safety problems caused by hardware failure. Overall, this system can significantly improve the safety of the battery system, reduce the risk of sparks and sparks, and protect the safety of users' lives and property.

[0058] In an embodiment, please refer to Figure 2The temperature monitoring module 20 comprises temperature sensors built-in the battery pack.

[0059] In an embodiment, referring to Figure 2 The temperature monitoring sensors comprise four battery pack temperature acquisition circuits and two MOS temperature acquisition circuits, which are connected to the temperature sensors respectively; the four battery pack temperature acquisition circuits and the two MOS temperature acquisition circuits are connected to the main control module 10 respectively.

[0060] Specifically, referring to Figure 2 The connection mode of the four temperature sensors and their connection with the main control module 10 are shown, wherein each temperature sensor is powered by a 3V3_TEMP power supply.

[0061] The power supply is connected to each temperature sensor through resistors RVM100, RVM101, RVM102 and RVM111.

[0062] The output end of each temperature sensor has a capacitor CVM26, CVM15, CVM30 and CVM34 for filtering.

[0063] These capacitors stabilize the signal and reduce noise interference.

[0064] The output signal of each temperature sensor is transmitted to the corresponding input end VTEMPA_AD, VTEMPB_AD, VTEMPC_AD and VTEMPD_AD of the main control module through resistors RMCU15, RMCU18, RMCU19 and RMCU20.

[0065] The ground wire GND_MCU of all circuits is connected together to ensure that the entire circuit has a common reference ground.

[0066] Specifically, each temperature sensor is powered by a 3V3_TEMP power supply and the current is limited by a corresponding resistor (such as RVM100).

[0067] The temperature sensor converts the temperature into a voltage signal.

[0068] The voltage signal is filtered by a filtering capacitor (such as CVM26) to remove noise and interference.

[0069] The filtered signal is transmitted to the corresponding input end (such as VTEMPA_AD) of the main control module through a resistor (such as RMCU15).

[0070] The main control module 10 reads the voltage signal of the temperature sensor through these input ends and calculates the actual temperature value according to the preset algorithm.

[0071] Each temperature sensor is powered by a 3V3_TEMP power source, with current limited by a resistor.

[0072] The output signal of each temperature sensor is filtered by a capacitor, ensuring signal stability.

[0073] The filtered signal is transmitted to the corresponding input of the main control module through a resistor.

[0074] The ground of all circuits is connected together, providing a common reference ground.

[0075] In this way, the circuit can accurately collect and transmit the signal of the temperature sensor for the main control module to further process and analyze.

[0076] Please refer to Figure 3 , which presents a circuit for collecting MOS temperature. The left side of the circuit has a voltage source 3V3_TEMP connected to test point TP49 through resistor RVM103.

[0077] Resistor RVM103 is used to limit the current.

[0078] Test point TP49 is used to measure the voltage in the circuit or for debugging.

[0079] Capacitors CVM14 and CVM5 are connected in parallel with ground GND_MCU for filtering and stabilizing voltage.

[0080] The signal is connected to the output MOS_TEMP_TEST through resistor RVM107.

[0081] Capacitor CVM5 is used for further filtering and stabilizing the output signal.

[0082] Ground GND_MCU provides a reference ground for the entire circuit.

[0083] Specifically, voltage source 3V3_TEMP provides a stable 3.3V voltage.

[0084] Resistor RVM103 limits the current and distributes the voltage to test point TP49.

[0085] Capacitors CVM14 and CVM5 filter at the input and output respectively, ensuring signal stability.

[0086] Resistor RVM107 transmits the filtered signal to output MOS_TEMP_TEST.

[0087] This circuit ensures the stability and accuracy of the output signal through a stable voltage source and filtering capacitors.

[0088] Test point TP49 can be used to monitor the circuit status or for debugging.

[0089] The output MOS_TEMP_TEST provides a filtered signal for collecting temperature information of the MOS tube.

[0090] In one embodiment, referring to Figure 4 , a short circuit protection module 30 implemented by a comparator scheme is shown. The main function of this module is to detect whether there is a transient short circuit voltage / current at the discharge output (P-side) to identify a short circuit fault, and to allow the anti-arcing detection function to be performed in the case of a non-short circuit fault.

[0091] There is an input signal Vin on the left side of the circuit, which is connected to the input VIN of the detection control module through resistors RMS04 and RMS05.

[0092] Capacitors CMS02 and CMS03 are connected in parallel with RMS04 and RMS05 respectively for filtering.

[0093] The detection control module has two outputs: DEOUT_ON and DEOUT_OFF.

[0094] The DEOUT_ON output signal is connected to the base of transistor QMS13 through resistor RMS07.

[0095] The DEOUT_OFF output signal is connected to the emitter of transistor QMS13 through resistor RMS12.

[0096] Transistor QMS13 is an NPN transistor, whose base receives the DEOUT_ON signal through resistor RMS07.

[0097] The collector of transistor QMS13 is connected to the power supply VDD_MSW and to the load M through diode DMS03 and resistor RMS08.

[0098] The emitter of transistor QMS13 receives the DEOUT_OFF signal through resistor RMS12.

[0099] The load M is connected to the power supply VDD_MSW through diode DMS03 and resistor RMS08.

[0100] Diode DMS03 is used to protect the circuit from reverse current flow.

[0101] When DEOUT_ON is high, transistor QMS13 is turned on, current flows from VDD_MSW through QMS13 to the load M, and the load M works.

[0102] When DEOUT_OFF is high, transistor QMS13 is turned off, and the load M does not work.

[0103] The input signal Vin is filtered and then enters the detection control module.

[0104] The detection control module outputs a DEOUT_ON or DEOUT_OFF signal according to the state of the input signal.

[0105] The on or off of transistor QMS13 is controlled to realize the switch control of load M.

[0106] In an embodiment, referring to Figure 5 The reverse connection protection module 40 described above includes a comparator UMS1, which is connected to the battery pack and the master control module 10 respectively.

[0107] Specifically, Figure 5 A reverse connection protection module 40 implemented by a comparator scheme is shown.

[0108] PACK- and E- are power input terminals.

[0109] 3V3_MCU is a 3.3V power output, which is used to supply power to the master control module.

[0110] The comparator UMS1 is used to detect the polarity of the power supply.

[0111] The two input terminals of the comparator are connected to PACK- and E- respectively.

[0112] The diode DMS19 is used to prevent current from flowing back when the power supply is reversed.

[0113] The resistors RMS34 and RMS67 are used to limit the current and divide the voltage.

[0114] Test points TP1, TP82, and TP3 are used to monitor the circuit state.

[0115] The ground wire AFB_GND provides a reference ground for the entire circuit.

[0116] PACK- and E- are power input terminals, and under normal circumstances, PACK- should be positive and E- should be negative.

[0117] The power supply is connected to the input terminal of the comparator UMS1 through the resistor RMS34.

[0118] The two input terminals of the comparator UMS1 are connected to PACK- and E- respectively.

[0119] If the polarity of the power supply is correct (PACK- is positive and E- is negative), the output of the comparator will be high.

[0120] If the polarity of the power supply is reversed (PACK- is negative and E- is positive), the output of the comparator will be low.

[0121] Diode DMS19 prevents current from flowing in reverse when the power supply is reversed, thus protecting the circuit.

[0122] The output of the comparator is transmitted to the reverse_bat terminal through resistor RMS67.

[0123] The reverse_bat terminal can be connected to the corresponding input terminal of the master module for detecting the polarity of the power supply.

[0124] PACK- and E- are power input terminals, with PACK- being the positive terminal and E- being the negative terminal under normal circumstances. Comparator UMS1 is used to detect the polarity of the power supply, with a high-level output indicating correct polarity and a low-level output indicating reversed polarity. Diode DMS19 prevents current from flowing in reverse when the power supply is reversed. The output of the comparator is transmitted to the reverse_bat terminal through resistor RMS67 for detecting the polarity of the power supply.

[0125] In this way, the circuit can effectively detect and protect the polarity of the power supply, ensuring normal operation of the system.

[0126] In an embodiment, referring to Figure 6 The current and voltage monitoring module 50 described above includes a current sensor, a voltage sensor, and a voltage and current acquisition module. The current sensor and the voltage sensor are respectively connected to the battery pack, and the voltage and current acquisition module is connected to the current sensor and the voltage sensor. The voltage and current acquisition module is connected to the master module 10.

[0127] Specifically, Figure 6 A voltage and current acquisition module implemented by voltage and current sensors is shown. The main function of this module is to monitor the discharge current and voltage changes of the battery pack and quickly disconnect the power supply in abnormal situations. The anti-arcing detection function relies on stable and effective voltage and current acquisition to support normal operating conditions of the system.

[0128] The voltage sensor (VCM) and the current sensor (ICM) respectively monitor the voltage and current of the battery pack. These sensors convert the voltage and current signals into digital signals and transmit them to the master module 10 through the I2C bus.

[0129] The master module 10 receives voltage and current data through the I2C bus. If an abnormality in voltage or current is detected, the master module 10 will immediately execute the corresponding control logic strategy to control the fuse or circuit breaker to cut off the power supply.

[0130] Specifically, the voltage sensor (VCM) and the current sensor (ICM) respectively monitor the voltage and current of the battery pack. These sensors convert the voltage and current signals into digital signals and transmit them to the master module 10 through the I2C bus.

[0131] The master module 10 receives voltage and current data through the I2C bus. The master module 10 processes and analyzes these data.

[0132] If an abnormality in voltage or current is detected, the master module 10 immediately executes the corresponding control logic strategy. The master module 10 cuts off the power supply by controlling the fuse or circuit breaker.

[0133] This module monitors the discharge current and voltage changes of the battery pack through voltage and current sensors, and transmits the data to the master module 10 through the I2C bus. When an abnormality in voltage or current occurs, the master module 10 quickly disconnects the power supply, ensuring the safety and reliability of the system. The anti-arcing detection function relies on stable and effective voltage and current collection, thereby supporting the normal operating conditions of the system.

[0134] In an embodiment, referring to Figure 7 The MOS sticking fault detection module 60 described above includes an LDO voltage collection circuit connected to the MOS tube, and the LDO voltage collection circuit is connected to the master module 10; the MOS tube is connected to the master module 10.

[0135] Specifically, Figure 7 A circuit is shown for determining whether a MOS tube has a sticking fault by detecting changes in the voltage at the load end during disconnection of the MOS tube. The main function of this circuit is to monitor the state of the MOS tube and immediately control the fuse or circuit breaker 80 to cut off the power supply when a sticking fault is detected.

[0136] 3V3_LDO is a 3.3V low dropout linear regulator (LDO) used to provide a stable voltage.

[0137] The LDO is connected to the master module through the resistor RMC2.

[0138] There are multiple MOS tubes in the figure: QMC2, QMC1, QMC3.

[0139] MOS tubes are used to control the switching of current.

[0140] Diodes DMC6, DMC3, DMC2, and DMC5 are used to protect the circuit from reverse current flow.

[0141] Resistors RMC4, RMC5, RMC12, RMC8, RMC6, and RMC11 are used for voltage division and current limiting.

[0142] Test points B- and PACK- are used to monitor the state of the circuit.

[0143] Specifically, the 3V3_LDO provides a stable 3.3V voltage, which is connected to the main control module through the resistor RMC2. The power supply is connected to the source of MOS tube QMC2 and QMC1 through resistors RMC4 and RMC5, respectively. MOS tubes QMC2 and QMC1 are used to control the switching of current. When the MOS tube is disconnected, the voltage at the load end will change.

[0144] The LDO voltage acquisition circuit acquires the state voltage of the MOS tube through the resistor RMC11.

[0145] The acquired voltage signal is transmitted to the main control module through the resistor RMC11.

[0146] The main control module 10 determines whether there is a sticking fault by monitoring the state voltage of the MOS tube. If a sticking fault is detected, the main control module 10 will immediately control the fuse or circuit breaker to cut off the power supply.

[0147] Specific steps: MOS tubes QMC2 and QMC1 normally work to control the switching of current. The LDO voltage acquisition circuit acquires the state voltage of the MOS tube through the resistor RMC11.

[0148] When the MOS tube is disconnected, the voltage at the load end will change. The main control module 10 determines whether there is a sticking fault by monitoring the state voltage of the MOS tube. If a sticking fault is detected, the main control module 10 will immediately control the fuse or circuit breaker to cut off the power supply.

[0149] The main control module 10 determines whether there is a sticking fault by monitoring the state voltage of the MOS tube, and immediately controls the fuse or circuit breaker to cut off the power supply when a sticking fault is detected. In this way, the circuit can effectively monitor the state of the MOS tube and take measures to protect the system immediately when a sticking fault is detected.

[0150] The AFE chip fault detection module 70 is diagnosed by the main control module 10 to determine the working state of the AFE chip. If the AFE chip is detected to be working abnormally and cannot be recovered, the power supply MOS tube is immediately disconnected or the fuse or circuit breaker 80 is controlled to cut off the power supply. When the AFE chip is faulty, the anti-fire strategy is not allowed to be executed.

[0151] In an embodiment, please refer to Figure 8 The above-mentioned circuit breaker 80 includes an automatic reset circuit breaker 80.

[0152] In an embodiment, please refer to Figure 8 The above-mentioned BMS anti-fire device further includes a fuse connected to the main control module 10.

[0153] Specifically, Figure 8A system is demonstrated that ensures automatic disconnection of the charge-discharge circuit when a MOS failure is detected by integrating a fuse or automatic reset circuit breaker. The main function of the circuit is to monitor the state of the MOS tube and immediately control the fuse or circuit breaker to cut off the power supply when a sticking failure is detected, ensuring the safety and reliability of the system.

[0154] +5V_DCDC is a 5V power input.

[0155] The power supply is connected to the source of MOS tube Q4 through resistor R2.

[0156] MOS tubes Q4 and Q5 are used to control the switching of current.

[0157] MOS tube Q3 is used to detect faults and control the circuit breaker.

[0158] Diode D1 is used to protect the circuit from reverse current.

[0159] Resistors R2, R4, R5, R7, and R8 are used for voltage division and current limiting.

[0160] Capacitor C3 is used for filtering and smoothing voltage.

[0161] Test points B- and B+ / NF are used to monitor the state of the circuit.

[0162] Circuit breaker F3.1 is used to cut off the power supply when a fault is detected.

[0163] Specifically, +5V_DCDC provides a stable 5V voltage, which is connected to the source of MOS tube Q4 through resistor R2.

[0164] MOS tubes Q4 and Q5 are used to control the switching of current.

[0165] When the MOS tube is disconnected, the voltage at the load end changes.

[0166] Resistors R4 and R5 form a voltage dividing circuit to collect the state voltage of the MOS tube.

[0167] The collected voltage signal is transmitted to the main control module through resistors R4 and R5.

[0168] The main control module determines whether there is a sticking failure by monitoring the state voltage of the MOS tube.

[0169] If a sticking failure is detected, the main control module will immediately control the circuit breaker F3.1 to cut off the power supply.

[0170] Specific steps:

[0171] MOS tubes Q4 and Q5 normally work to control the switching of current.

[0172] The resistors R4 and R5 form a voltage divider circuit to collect the state voltage of the MOS tube.

[0173] When the MOS tube is disconnected, the voltage at the load end will change.

[0174] The master control module determines whether there is a sticking fault by monitoring the state voltage of the MOS tube.

[0175] If a sticking fault is detected, the master control module will immediately control the circuit breaker F3.1 to cut off the power supply.

[0176] In this way, the circuit can effectively monitor the state of the MOS tube and immediately control the circuit breaker to cut off the power supply when a sticking fault is detected, ensuring the safety and reliability of the system.

[0177] The circuit ensures that the charging and discharging circuit is automatically disconnected when a MOS fault is detected by integrating a fuse or an automatic reset circuit breaker 80. When a sticking fault is detected, the master control module 10 will immediately control the fuse or circuit breaker 80 to cut off the power supply, ensuring the safety and reliability of the system. The anti-arcing detection function relies on stable and effective voltage and current collection to support normal system operating conditions.

[0178] The above-mentioned BMS anti-arcing device integrates multiple protection modules to effectively prevent the battery system from arcing and ensure safe operation. The temperature monitoring module 20 monitors the temperature of the battery and MOS tube in real time and automatically cuts off the power supply when the preset threshold is exceeded. The short circuit protection module 30 detects voltage changes to identify short circuit conditions and promptly cuts off the power supply. The reverse connection protection module 40 automatically cuts off the power supply when the battery wiring is incorrect to prevent electrical faults. The current and voltage monitoring module 50 monitors the battery current and voltage in real time and immediately cuts off the power supply if an anomaly occurs. The MOS sticking fault detection module 60 can identify MOS tube faults to ensure the safety of the battery system. The AFE chip fault detection module 70 ensures the normal operation of the battery monitoring system and automatically cuts off the power supply if the chip fails, further improving safety.

[0179] The above is only a specific implementation of the present application, but the scope of protection of the present application is not limited thereto. Any skilled person in the art can easily think of various equivalent modifications or replacements within the scope of the technology disclosed by the present application, and these modifications or replacements should be covered within the scope of protection of the present application. Therefore, the scope of protection of the present application should be subject to the scope of protection of the claims.

Claims

1. A BMS anti-arcing device, characterized by, The application relates to a battery pack protection system, which comprises a main control module, a temperature monitoring module, a short-circuit protection module, a reverse connection protection module, a current and voltage monitoring module, a MOS sticking fault detection module, an AFE chip fault detection module and a circuit breaker. The temperature monitoring module is used for monitoring the temperature of the battery and the MOS tube in the battery pack in real time, and cutting off the power supply by the main control module when the temperature exceeds a preset threshold. The short-circuit protection module is used for detecting whether a short circuit occurs by detecting the voltage change of the discharge end, and cutting off the power supply by the main control module when the short circuit is detected. The reverse connection protection module is used for detecting whether the battery pack is reversely connected, and cutting off the power supply by the main control module in the case of reverse connection. The current and voltage monitoring module is used for monitoring the current and voltage changes of the battery pack simultaneously, and cutting off the power supply by the main control module when the current or voltage is abnormal. The MOS sticking fault detection module is used for detecting whether the MOS tube has a sticking fault, and cutting off the power supply by the main control module when the fault is found. The AFE chip fault detection module is used for detecting the working state of the AFE chip, and cutting off the power supply by the main control module when the chip is faulty. The circuit breaker is used for automatically cutting off the charging and discharging circuit of the battery pack by the main control module when the MOS tube fault is detected. The temperature monitoring module comprises a temperature sensor which is built in the battery pack.

2. A BMS anti-arcing device according to claim 1, wherein, The temperature monitoring sensor comprises a four-way battery pack temperature acquisition circuit and a two-way MOS temperature acquisition circuit, the four-way battery pack temperature acquisition circuit and the two-way MOS temperature acquisition circuit are connected with the temperature sensor respectively, and the four-way battery pack temperature acquisition circuit and the two-way MOS temperature acquisition circuit are connected with the main control module respectively.

3. A BMS anti-arcing device according to claim 2, wherein, The reverse connection protection module comprises a comparator USM1 which is connected with the battery pack and the main control module respectively.

4. A BMS anti-arcing device according to claim 1, wherein, The current and voltage monitoring module comprises a current sensor, a voltage sensor and a voltage and current acquisition module, the current sensor and the voltage sensor are connected with the battery pack respectively, the voltage and current acquisition module is connected with the current sensor and the voltage sensor respectively, and the voltage and current acquisition module is connected with the main control module.

5. A BMS anti-arcing device according to claim 1, wherein, The MOS sticking fault detection module comprises an LDO voltage acquisition circuit which is connected with the MOS tube, the LDO voltage acquisition circuit is connected with the main control module, and the MOS tube is connected with the main control module.

6. A BMS anti-arcing device according to claim 1, wherein, The circuit breaker comprises an automatic reset circuit breaker.

7. A BMS anti-arcing device according to claim 6, wherein, The application further comprises a fuse which is connected with the main control module.

8. A BMS anti-arcing device according to claim 7, wherein, ​

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