Lead-acid circuit breaker, lead-acid battery protection method and lead-acid circuit breaker system

Abstract

The embodiment of the invention discloses a lead-acid circuit breaker, a lead-acid battery protection method and a lead-acid circuit breaker system. The lead-acid circuit breaker comprises a control module, a sampling circuit and a cut-out switch, the sampling circuit is electrically connected with the control module and configured to collect battery information of the lead-acid battery, one end of the cut-out switch is electrically connected with the lead-acid battery, the other end of the cut-out switch is electrically connected with the whole vehicle end, and the control end of the cut-out switch is electrically connected with the control module. The control module is configured to control the cut-off switch to open or close the main loop between the lead-acid battery and the whole vehicle end according to the battery information, so that on-off control can be performed on the main loop between the lead-acid battery and the whole vehicle end in time when the lead-acid battery is over-discharged, the over-discharge of the lead-acid battery is avoided, and the service life of the lead-acid battery is prolonged. The safe application of the lead-acid battery is guaranteed, the service life of the lead-acid battery is prolonged, and the user experience is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of lead-acid batteries, in particular to a lead-acid circuit breaker, a protection method of a lead-acid battery and a lead-acid circuit breaker system. BACKGROUND

[0002] Lead-acid batteries occupy an important position in the 24V commercial vehicle market due to their low cost, mature technology and perfect industrial chain, especially in the price-sensitive short-distance transportation and urban logistics fields. However, in the application process, lead-acid batteries usually face over-discharge problems, which cause the repeated expansion and contraction of the plates of the lead-acid battery, accelerate the shedding of active materials from the plates, destroy the internal structure of the lead-acid battery, and a large amount of lead sulfate (PbSO4) on the battery plate will crystallize, causing plate sulfuration, greatly reducing the service life of the lead-acid battery, and leading to the inability of the lead-acid battery to run reliably for a long time. SUMMARY

[0003] In view of the deficiencies of the prior art, the present application provides a lead-acid circuit breaker, a protection method of a lead-acid battery and a lead-acid circuit breaker system, aiming to solve the technical problem of low service life of lead-acid batteries caused by over-discharge in the prior art.

[0004] In a first aspect, the present application provides a lead-acid circuit breaker, comprising:

[0005] a control module;

[0006] a sampling circuit electrically connected to the control module and configured to collect battery information of the lead-acid battery;

[0007] a circuit breaker switch, one end of the circuit breaker switch being electrically connected to the lead-acid battery, the other end of the circuit breaker switch being electrically connected to a vehicle end, and a control end of the circuit breaker switch being electrically connected to the control module;

[0008] wherein the control module is configured to control the circuit breaker switch to open or close a main loop between the lead-acid battery and the vehicle end according to the battery information.

[0009] Further, in the lead-acid circuit breaker provided by the present application, the sampling circuit comprises a shunt and an analog front-end module, and the battery information comprises current information of the lead-acid battery;

[0010] wherein one end of the shunt is respectively electrically connected to the lead-acid battery and the analog front-end module, the other end of the shunt is respectively electrically connected to one end of the circuit breaker switch and the analog front-end module, and the analog front-end module is electrically connected to the control module;

[0011] The analog front-end module is configured to collect a differential signal between the two ends of the shunt to generate the current information.

[0012] Further, the sampling circuit further comprises a thermistor, and the battery information further comprises temperature information of the lead-acid battery.

[0013] The thermistor is electrically connected to the analog front-end module, and is arranged at the negative electrode of the lead-acid battery to collect the temperature information.

[0014] Further, the sampling circuit further comprises a voltage collection module, the lead-acid battery comprises a first battery pack and a second battery pack, and the battery information further comprises voltage information of the lead-acid battery.

[0015] The first end of the voltage collection module is electrically connected to the positive electrode of the first battery pack and the negative electrode of the second battery pack, respectively, the second end of the voltage collection module is electrically connected to the positive electrode of the second battery pack, the third end of the voltage collection module is electrically connected to the control module, the negative electrode of the first battery pack is electrically connected to the circuit breaker switch, and the voltage collection module is configured to collect the voltage information.

[0016] Further, the lead-acid circuit breaker further comprises a power supply module.

[0017] One end of the power supply module is electrically connected to the positive electrode of the second battery pack, and the other end of the power supply module is electrically connected to the power supply end of the control module.

[0018] Further, the circuit breaker switch comprises a plurality of MOS tubes, and the lead-acid circuit breaker further comprises a driving module.

[0019] The source of each MOS tube is electrically connected to the lead-acid battery, the drain of each MOS tube is electrically connected to the whole vehicle end, the gate of each MOS tube is electrically connected to one end of the driving module, and the other end of the driving module is electrically connected to the control module.

[0020] Further, the lead-acid circuit breaker further comprises a LIN transceiver.

[0021] One end of the LIN transceiver is electrically connected to the control module, and the other end of the LIN transceiver is electrically connected to the whole vehicle end; or / and,

[0022] The lead-acid circuit breaker further comprises a CAN transceiver.

[0023] One end of the CAN transceiver is electrically connected to the control module, and the other end of the CAN transceiver is electrically connected to the whole vehicle end; or / and,

[0024] The lead-acid circuit breaker further comprises a wireless communication module.

[0025] The wireless communication module is electrically connected to the control module.

[0026] Further, in the lead-acid circuit breaker provided by the application, the vehicle end is provided with a vehicle controller, a vehicle generator and an air conditioner load.

[0027] The first end of the vehicle controller, one end of the vehicle generator and one end of the air conditioner load are electrically connected to the positive electrode of the lead-acid battery, the second end of the vehicle controller, the other end of the vehicle generator and the other end of the air conditioner load are electrically connected to the other end of the circuit breaker, and the third end of the vehicle controller is electrically connected to the control module.

[0028] In a second aspect, the application further provides a protection method for a lead-acid battery, which uses the lead-acid circuit breaker provided in the first aspect to protect the lead-acid battery, and the method comprises the following steps:

[0029] determining whether the lead-acid battery is in an abnormal state according to battery information of the lead-acid battery;

[0030] if the lead-acid battery is in the abnormal state, controlling the circuit breaker to open or close a main circuit between the lead-acid battery and the vehicle end to protect the lead-acid battery.

[0031] Further, in the protection method for the lead-acid battery provided by the application, the step of controlling the circuit breaker to open or close the main circuit between the lead-acid battery and the vehicle end to protect the lead-acid battery comprises the following steps:

[0032] controlling the circuit breaker to open or close the main circuit between the lead-acid battery and the vehicle end according to a vehicle working condition in which the lead-acid battery is located to protect the lead-acid battery.

[0033] Still further, in the protection method for the lead-acid battery provided by the application, the step of controlling the circuit breaker to open or close the main circuit between the lead-acid battery and the vehicle end according to the vehicle working condition in which the lead-acid battery is located to protect the lead-acid battery comprises the following steps:

[0034] if the vehicle working condition is a driving working condition, controlling the circuit breaker to close and sending a request instruction for charging the lead-acid battery to the vehicle end to charge the lead-acid battery;

[0035] if the vehicle working condition is a static working condition or a parking load working condition, controlling the circuit breaker to open to disconnect the main circuit between the lead-acid battery and the vehicle end.

[0036] Still further, in the protection method for the lead-acid battery provided by the application, the battery information comprises voltage information of the lead-acid battery, and the abnormal state comprises an over-discharge state.

[0037] The step of determining whether the lead-acid battery is in the abnormal state according to the battery information of the lead-acid battery comprises the following steps:

[0038] determining whether a total voltage of the lead-acid battery is less than or equal to a preset first threshold value according to the voltage information;

[0039] If it is determined that the total voltage of the lead-acid battery is less than or equal to the first threshold value, it is determined that the lead-acid battery is in an over-discharge state.

[0040] Further, in the method for protecting the lead-acid battery provided in the present application, the battery information further includes current information of the lead-acid battery.

[0041] The method further includes determining, according to the battery information of the lead-acid battery, whether the lead-acid battery is in an abnormal state.

[0042] The method further includes determining, according to the voltage information and the current information, whether the state of charge of the lead-acid battery is less than or equal to a preset second threshold value.

[0043] If the state of charge of the lead-acid battery is less than or equal to the preset second threshold value, it is determined that the lead-acid battery is in an over-discharge state.

[0044] Further, in the method for protecting the lead-acid battery provided in the present application, the abnormal state further includes a current abnormal state.

[0045] The method further includes determining, according to the battery information of the lead-acid battery, whether the lead-acid battery is in an abnormal state.

[0046] If the vehicle operating condition is a stationary operating condition, the method further includes determining, according to the current information, whether the dark current of the lead-acid battery is greater than or equal to a preset third threshold value.

[0047] If the dark current of the lead-acid battery is greater than or equal to the third threshold value, it is determined that the lead-acid battery is in a current abnormal state.

[0048] Further, in the method for protecting the lead-acid battery provided in the present application, after determining whether the dark current of the lead-acid battery is greater than or equal to the preset third threshold value, the method further includes:

[0049] If the dark current of the lead-acid battery is less than the third threshold value, the method further includes determining, according to the voltage information or / and the current information, whether the lead-acid battery is in an over-discharge state.

[0050] Further, in the method for protecting the lead-acid battery provided in the present application, the method further includes:

[0051] If the vehicle operating condition is a stationary operating condition or a parked load operating condition, and the abnormal state is an over-discharge state, the method further includes controlling the lead-acid circuit breaker to enter a hibernation low-power consumption mode.

[0052] Further, in the method for protecting the lead-acid battery provided in the present application, the method further includes:

[0053] If the lead-acid battery is in an abnormal state, the method further includes sending, to a vehicle end or / and a user terminal, alarm information that the lead-acid battery is in the abnormal state.

[0054] In a third aspect, the application further provides a lead-acid circuit breaker system, which comprises the lead-acid circuit breaker provided in the first aspect, and is arranged in a main circuit between the lead-acid battery and the vehicle end.

[0055] The lead-acid circuit breaker provided by the application comprises a control module, a sampling circuit and a circuit breaker switch, the sampling circuit is electrically connected to the control module and is configured to collect battery information of the lead-acid battery, one end of the circuit breaker switch is electrically connected to the lead-acid battery, the other end of the circuit breaker switch is electrically connected to the vehicle end, and the control end of the circuit breaker switch is electrically connected to the control module, the control module is configured to control the circuit breaker switch to open or close the main circuit between the lead-acid battery and the vehicle end according to the battery information, so that the main circuit between the lead-acid battery and the vehicle end can be controlled to be opened or closed in time when the lead-acid battery is over-discharged, over-discharge of the lead-acid battery is avoided, safe application of the lead-acid battery is ensured, the service life of the lead-acid battery is improved, and user experience is improved. BRIEF DESCRIPTION OF DRAWINGS

[0056] In order to more clearly illustrate the technical solutions of the embodiments of the application, the drawings needed in the embodiment description will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor.

[0057] Figure 1 A schematic block diagram of the lead-acid circuit breaker provided by the embodiments of the application;

[0058] Figure 2 A circuit diagram of the lead-acid circuit breaker system provided by the embodiments of the application;

[0059] Figure 3 A flowchart of the protection method of the lead-acid battery provided by the embodiments of the application.

[0060] Reference signs:

[0061] 100, lead-acid circuit breaker; 110, control module; 120, sampling circuit; 121, analog front-end module; 122, shunt; 123, voltage sampling module; 130, circuit breaker switch; 140, power supply module; 150, driving module; 160, wireless communication module; 200, lead-acid battery; 210, first battery pack; 220, second battery pack; 300, vehicle end; 310, vehicle controller; 320, vehicle generator; 330, air conditioning load; 400, communication connector. DETAILED DESCRIPTION

[0062] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described. Obviously, the described embodiments are some of the embodiments of the present application, but not all of the embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts are within the scope of the present application.

[0063] It should be understood that the terms "comprising" and "including" as used in the specification and the appended claims indicate the presence of the described features, integers, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and / or groups thereof.

[0064] It should also be understood that the terms used in the specification of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application. As used in the specification and the appended claims of the present application, the singular forms "a", "an" and "the" are intended to include the plural forms unless the context clearly indicates otherwise.

[0065] It should be further understood that the term "and / or" used in the specification and the appended claims of the present application means any combination of one or more of the associated listed items and all possible combinations thereof, and includes these combinations.

[0066] In addition, in the present application, unless otherwise explicitly specified or limited in the embodiments, the terms "mounting", "connecting", "connecting" and "fixing" and the like appearing in the embodiments should be understood broadly, for example, the connection can be a fixed connection, or a detachable connection, or integrated, which can be understood, or can be a mechanical connection, an electrical connection, etc. Of course, it can also be directly connected, or indirectly connected through an intermediate medium, or the internal communication of two elements, or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific implementation situation.

[0067] In the related art, after the 24V lead-acid battery is installed on the vehicle, if the vehicle is in a long-term stationary state, the static power consumption of the vehicle continuously consumes the energy of the lead-acid battery, and the lead-acid battery will appear over-discharged; at the same time, the vehicle often needs to install a parking air conditioner, i.e. an air conditioner load, when the vehicle is in a parked working condition, if the lead-acid battery supplies power for the refrigeration of the parking air conditioner, the lead-acid battery will also appear over-discharged.

[0068] However, due to the absence of a battery protection system in the lead-acid battery, when the lead-acid battery is in an over-discharged state, the plates of the lead-acid battery repeatedly expand and contract, which accelerates the shedding of active material from the plates, further damages the internal structure of the battery, and the lead sulfate (PbSO4) on the plates of the lead-acid battery crystallizes in large quantities, causing the plates to sulfide, and ultimately leading to a sharp decrease in the service life of the lead-acid battery, severely affecting user experience.

[0069] To this end, the present application provides a lead-acid circuit breaker, a protection method for a lead-acid battery, and a lead-acid circuit breaker system. The lead-acid circuit breaker includes a control module, a sampling circuit, and a circuit breaker switch. The sampling circuit is electrically connected to the control module and is configured to collect battery information of the lead-acid battery. One end of the circuit breaker switch is electrically connected to the lead-acid battery, and the other end of the circuit breaker switch is electrically connected to a vehicle end. The control end of the circuit breaker switch is electrically connected to the control module. The control module is configured to control the circuit breaker switch to open or close the main circuit between the lead-acid battery and the vehicle end according to the battery information. This enables timely on-off control of the main circuit between the lead-acid battery and the vehicle end when the lead-acid battery is over-discharged, thereby avoiding over-discharge of the lead-acid battery, ensuring safe application of the lead-acid battery, improving the service life of the lead-acid battery, and improving user experience.

[0070] Please refer to Figure 1 , Figure 1 The schematic block diagram of the lead-acid circuit breaker 100 provided by the embodiments of the present application is shown in FIG. 1. As shown in FIG. 1, the present application provides a lead-acid circuit breaker 100, which includes: Figure 1

[0071] a control module 110;

[0072] a sampling circuit 120 electrically connected to the control module 110 and configured to collect battery information of a lead-acid battery 200;

[0073] a circuit breaker switch 130, one end of the circuit breaker switch 130 being electrically connected to the lead-acid battery 200, the other end of the circuit breaker switch 130 being electrically connected to a vehicle end 300, and the control end of the circuit breaker switch 130 being electrically connected to the control module 110;

[0074] The control module 110 is configured to control the circuit breaker switch 130 to open or close the main circuit between the lead-acid battery 200 and the vehicle end 300 according to the battery information.

[0075] ​Specifically, the control module 110 can be a microcontroller unit (MCU). The control module 110 is the control center of the lead-acid circuit breaker 100. According to the battery information collected by the sampling circuit 120, the control module 110 can output a control signal to the circuit breaker 130 to control the on-off of the circuit breaker 130. The circuit breaker 130 is arranged in the main circuit between the lead-acid battery 200 and the vehicle end 300. The on-off of the circuit breaker 130 can realize the on-off of the main circuit between the lead-acid battery 200 and the vehicle end 300, thereby avoiding over-discharge of the lead-acid battery 200, achieving over-discharge protection of the lead-acid battery 200, prolonging the service life of the lead-acid battery 200, and improving user experience.

[0076] In the present application, the sampling circuit 120 can sample the current, voltage and temperature of the lead-acid battery 200 to form the battery information of the lead-acid battery 200. During the current sampling process of the lead-acid battery 200, the sampling circuit 120 can collect the current of the main circuit between the lead-acid battery 200 and the vehicle end 300 to determine the real-time current of the lead-acid battery 200. During the voltage sampling process of the lead-acid battery 200, the sampling circuit 120 can sample at the positive electrode of the lead-acid battery 200 to obtain the total voltage of the lead-acid battery 200.

[0077] Meanwhile, the lead-acid circuit breaker 100 can be arranged between the negative electrode of the lead-acid battery 200 and the vehicle end 300. The lead-acid circuit breaker 100 can be electrically connected to the negative electrode of the lead-acid battery 200 through the adapter B-. When the sampling circuit 120 samples the temperature of the lead-acid battery 200, the sampling circuit 120 can collect the temperature at the adapter B- to obtain the real-time temperature of the lead-acid battery 200.

[0078] The present application realizes the intelligentization of the lead-acid circuit breaker 100 by arranging the control module 110, the sampling circuit 120 and the circuit breaker 130 in the lead-acid circuit breaker 100. When the lead-acid battery 200 abnormally, the lead-acid battery 200 can be protected in time, thereby prolonging the service life of the lead-acid battery 200. The circuit breaker 130 is a protection switch of the lead-acid circuit breaker. It is used to disconnect the main circuit in the case of serious under-voltage and low SOC of the lead-acid battery 200, to prevent over-discharge of the lead-acid battery 200, thereby protecting the safety of the lead-acid battery 200 and prolonging the service life of the lead-acid battery 200.

[0079] It should be noted that when the lead-acid circuit breaker 100 is used to protect the lead-acid battery 200 in this application, it not only provides over-discharge protection for the lead-acid battery 200, but also provides over-current protection and temperature protection for the lead-acid battery 200. The lead-acid circuit breaker 100 can be selected to protect the lead-acid battery 200 according to the actual application, and this application does not make any specific limitations.

[0080] In addition, lead-acid battery 200 can be understood as the battery in the vehicle. Lead-acid battery 200 can provide 24V voltage to the vehicle. Lead-acid battery 200 can be formed by multiple battery packs connected in series and parallel.

[0081] In some embodiments, such as Figure 2 As shown, the sampling circuit 120 includes a shunt 122 and an analog front-end module 121. The battery information includes the current information of the lead-acid battery 200. One end of the shunt 122 is electrically connected to the lead-acid battery 200 and the analog front-end module 121, respectively. The other end of the shunt 122 is electrically connected to one end of the circuit breaker 130 and the analog front-end module 121, respectively. The analog front-end module 121 is electrically connected to the control module 110. The analog front-end module 121 is configured to collect the differential signals at both ends of the shunt 122 to generate current information.

[0082] In this application, the shunt 122 can be located between the circuit breaker 130 and the negative terminal of the lead-acid battery 200. Specifically, one end of the shunt 122 is electrically connected to the negative terminal of the lead-acid battery 200 through an adapter terminal B-, and the other end of the shunt 122 is electrically connected to one end of the circuit breaker 130. At the same time, the analog front-end module 121 can be electrically connected to both ends of the shunt 122 to collect the differential signal between the two ends of the shunt 122. The voltage difference between the two ends of the shunt 122 is input to the analog front-end module 121 in the form of differential signals (signal IC+, signal IC-) for processing, so as to obtain the current information of the lead-acid battery 200, and thus obtain the real-time current of the lead-acid battery 200.

[0083] Meanwhile, the analog front-end module 121 can transmit the current information to the control module 110 after collecting the current information of the lead-acid battery 200. The control module 110 can determine whether the lead-acid battery 200 is in an abnormal state according to the current information transmitted by the analog front-end module 121, and then determine whether to control the disconnection of the circuit breaker 130 to cut off the main circuit between the lead-acid battery 200 and the vehicle end 300, thereby protecting the lead-acid battery 200. When transmitting the current information to the control module 110, the analog front-end module 121 can transmit the current information to the control module 110 in the form of an IIC signal, or can transmit the current information to the control module 110 by using an SPI (Serial Peripheral Interface). The transmission mode can be selected according to actual application, and the present application does not make specific limitation.

[0084] The shunt 122 (SHUNT) can be welded and integrated on the PCB board where the lead-acid circuit breaker is located. The shunt 122 includes but is not limited to an alloy resistor shunt 122, a thin film resistor, and a thick film resistor. The analog front-end (Analog Front-End, AFE) module is used to process analog signals received from sensors or other analog signal sources and convert them into digital signals for subsequent digital circuit design processing. The main functions of the analog front-end module 121 include signal amplification, frequency conversion, modulation and demodulation, adjacent frequency processing, level adjustment and control, and mixing, etc.

[0085] In addition, the analog front-end module 121 can determine the frequency of collecting the current of the main circuit according to the actual working condition of the vehicle. Meanwhile, when the analog front-end module 121 detects that the main circuit current exceeds the set protection threshold, the sleep overcurrent protection mechanism in the analog front-end module 121 can be triggered immediately, and the control module 110 can be awakened, thereby realizing the current overcurrent protection function of the vehicle in the sleep working condition, and achieving the purpose of protecting the lead-acid battery 200. The analog front-end module 121 can be electrically connected to the pin IIC of the control module 110 to realize data interaction with the control module 110.

[0086] In some embodiments, as shown in Figure 2 The sampling circuit 120 also includes a thermistor, and the battery information also includes temperature information of the lead-acid battery 200. The two ends of the thermistor are electrically connected to the analog front-end module 121, and the thermistor is arranged at the negative electrode of the lead-acid battery 200 to collect the temperature information.

[0087] In the present application, a thermistor (NTC) can be arranged at the adapter terminal B-, and the two ends of the thermistor can be electrically connected to the analog front-end module 121 respectively. The analog front-end module 121 can determine the real-time temperature at the adapter terminal B- by collecting the resistance value of the thermistor, and represent the real-time temperature as temperature information of the lead-acid battery 200.

[0088] Meanwhile, a temperature sampling processing circuit can also be arranged between the thermistor and the analog front-end module 121. The temperature sampling processing circuit can input the temperature data collected at the thermistor to the analog front-end module 121 after processing, and then input the temperature information to the control module 110 through the analog front-end module 121. After receiving the temperature information input by the analog front-end module 121, the control module 110 can determine whether the lead-acid battery 200 is in a state of excessively high or low temperature, so that the temperature protection measures for the lead-acid battery 200 can be performed.

[0089] In some embodiments, as shown in Figure 2 The sampling circuit 120 also includes a voltage collection module. The lead-acid battery 200 includes a first battery pack 210 and a second battery pack 220, and the battery information also includes voltage information of the lead-acid battery 200. The first end of the voltage collection module is electrically connected to the positive electrode of the first battery pack 210 and the negative electrode of the second battery pack 220 respectively, the second end of the voltage collection module is electrically connected to the positive electrode of the second battery pack 220, the third end of the voltage collection module is electrically connected to the control module 110, the negative electrode of the first battery pack 210 is electrically connected to the circuit breaker 130, and the voltage collection module is configured to collect the voltage information.

[0090] In the present application, the first battery pack 210 and the second battery pack 220 can both be 12V lead-acid battery 200 groups of the same specification, and each can be composed of six single lead-acid batteries with a voltage of 2V connected in series. The first battery pack 210 and the second battery pack 220 can be connected in series to form a 24V lead-acid battery 200. The positive electrode of the first battery pack 210 is electrically connected to the negative electrode of the second battery pack 220, the negative electrode of the first battery pack 210 is electrically connected to the adapter terminal B-, and the positive electrode of the second battery pack 220 is B+, which can be directly electrically connected to the vehicle terminal 300. The first battery pack 210 and the second battery pack 220 include but are not limited to AGM battery, maintenance-free battery, ordinary starting battery, parking air conditioner battery, high-temperature battery, low-temperature battery, and special battery. The adapter terminal B- can be a circular copper bar structure terminal, and the material of the adapter terminal B- includes but is not limited to nickel-plated red copper. One end of the adapter terminal B- can be mounted on the pole of the negative electrode of the first battery pack 210, and the other end of the adapter terminal B- can be electrically connected to the shunt 122 for battery negative electrode connection.

[0091] Meanwhile, the sampling circuit 120 provided by the application further comprises a voltage collection module, a first end of the voltage collection module is electrically connected with the positive pole of the first battery group 210 and the negative pole of the second battery group 220, i.e. electrically connected with a node V1 between the positive pole of the first battery group 210 and the negative pole of the second battery group 220, a second end of the voltage collection module is electrically connected with the positive pole of the second battery group 220 to form a node V2, so that the total voltage of the lead-acid battery 200 can be collected. The voltage collection module can be electrically connected with a pin ADC of the control module 110, so that after the voltage collection module collects the total voltage (voltage information) of the lead-acid battery 200, the voltage information can be transmitted to the control module 110 through the pin ADC, and the control module 110 can determine whether the lead-acid battery 200 is over-discharged after receiving the voltage information, so as to control the on-off of the circuit breaker 130 to protect the lead-acid battery 200 from over-discharge.

[0092] In some embodiments, as shown in Figure 2 The lead-acid circuit breaker 100 further comprises a power supply module 140; one end of the power supply module 140 is electrically connected with the positive pole of the second battery group 220, and the other end of the power supply module 140 is electrically connected with a power supply end VCC of the control module 110.

[0093] Specifically, the lead-acid circuit breaker 100 can further comprise a power supply module 140, and the power supply module 140 can be a DC / DC converter which can convert the voltage at the node V2 into different voltages to at least supply power to the control module 110.

[0094] In the application, the power supply module 140 can convert the voltage at the node V2 into a 3.3V voltage and a 5V voltage respectively, wherein the 3.3V voltage can supply power to the control module 110, and the 5V voltage can supply power to a CAN transceiver in the lead-acid circuit breaker 100. Meanwhile, the voltage at the node V2 can directly supply power to a LIN transceiver in the lead-acid circuit breaker 100.

[0095] In some embodiments, as shown in Figure 2 The circuit breaker 130 comprises a plurality of MOS tubes, and the lead-acid circuit breaker 100 further comprises a driving module 150; a source electrode of each MOS tube is electrically connected with the lead-acid battery 200, a drain electrode of each MOS tube is electrically connected with the whole vehicle end 300, a gate electrode of each MOS tube is electrically connected with one end of the driving module 150, and the other end of the driving module 150 is electrically connected with the control module 110.

[0096] In the present application, the circuit breaker 130 can be composed of m (m≥2) N-type MOS transistors in parallel to form a switch matrix, that is, the circuit breaker 130 includes a plurality of MOS transistors (Q1, …, Qm respectively), the source of each MOS transistor is electrically connected to the lead-acid battery 200, the drain of each MOS transistor is electrically connected to the vehicle end 300, the gate of each MOS transistor is electrically connected to one end of the driving module 150, the other end of the driving module 150 is electrically connected to the pin GPIO of the control module 110, thereby the control module 110 can control the on-off of all MOS transistors at the same time.

[0097] In some embodiments, as shown in Figure 2 the lead-acid circuit breaker 100 further includes a LIN transceiver and a CAN transceiver; wherein one end of the LIN transceiver is electrically connected to the control module 110, and the other end of the LIN transceiver is electrically connected to the vehicle end 300; one end of the CAN transceiver is electrically connected to the control module 110, and the other end of the CAN transceiver is electrically connected to the vehicle end 300.

[0098] In the present application, the lead-acid circuit breaker 100 and the vehicle end 300 can be provided with LIN transceivers and CAN transceivers, and the transceivers between the lead-acid circuit breaker 100 and the vehicle end 300 can be connected by plug-in connection of the communication connector 400, which includes a communication connector LIN and a communication connector CAN. One end of the LIN transceiver in the lead-acid circuit breaker 100 can be electrically connected to the pin LIN of the control module 110, and the other end of the LIN transceiver in the lead-acid circuit breaker 100 can be electrically connected to one end of the LIN transceiver in the vehicle end 300 by the communication connector LIN, and the other end of the LIN transceiver in the vehicle end 300 can be electrically connected to the vehicle controller 310 in the vehicle end 300, one end of the CAN transceiver in the lead-acid circuit breaker 100 can be electrically connected to the CAN pin of the control module 110, and the other end of the CAN transceiver in the lead-acid circuit breaker 100 can be electrically connected to one end of the CAN transceiver in the vehicle end 300 by the communication connector CAN, and the other end of the CAN transceiver in the vehicle end 300 can be electrically connected to the vehicle controller 310 in the vehicle end 300, thereby LIN communication and CAN communication with the vehicle end 300 can be realized, and the intelligentization of the lead-acid circuit breaker 100 can be further realized.

[0099] In some embodiments, as shown in Figure 2 the lead-acid circuit breaker 100 further includes a wireless communication module 160; wherein the wireless communication module 160 is electrically connected to the control module 110.

[0100] In the present application, the wireless communication module 160 can be electrically connected to the pin UART of the control module 110. The wireless communication module 160 can be a 4G module or a Bluetooth module. The 4G module can be used for 4G signal conversion and transmission. The 4G module includes a 4G communication and a 4G antenna. At the same time, the wireless communication module 160 can communicate wirelessly with the vehicle end 300 and can also communicate wirelessly with the user terminal. Thus, when the lead-acid battery 200 is detected to be in an abnormal state, the wireless communication module 160 can timely send an alarm message so that the user can timely process, thereby protecting the lead-acid battery 200.

[0101] In some embodiments, as shown in Figure 2 The vehicle end 300 is provided with a vehicle controller 310, a vehicle generator 320, and an air conditioning load 330. The first end of the vehicle controller 310, one end of the vehicle generator 320, and one end of the air conditioning load 330 are electrically connected to the positive electrode of the lead-acid battery 200. The second end of the vehicle controller 310, the other end of the vehicle generator 320, and the other end of the air conditioning load 330 are electrically connected to the other end of the circuit breaker 130. The third end of the vehicle controller 310 is electrically connected to the control module 110.

[0102] In the present application, the vehicle controller 310, the vehicle generator 320, and the air conditioning load 330 are all important parts of the vehicle. They can be connected in parallel between 24V+ and 24V ground GND in the vehicle end 300. It can be understood that they are connected in parallel between the positive and negative electrodes of the lead-acid battery 200.

[0103] The vehicle controller 310 (VCU) is the core of the modern automobile electronic control system, responsible for coordinating and managing multiple vehicle control units, including the powertrain, transmission system, steering system, braking system, etc. The vehicle controller 310 collects sensor data such as vehicle speed, acceleration, steering angle, etc., and performs real-time detection and control of the vehicle, thereby realizing functions such as vehicle power control, driving direction control, vehicle speed control, energy recovery, etc.

[0104] The vehicle generator 320 is part of the vehicle, which can provide power support for the vehicle. The vehicle generator 320 can refer to the vehicle-mounted generator, which can provide power for auxiliary power supply and air conditioning system, ensuring the safety and comfort of the vehicle.

[0105] The air conditioning load 330 can be understood as various devices in the air conditioning system of the vehicle, such as compressors, blowers, condenser fans, etc. The air conditioning load 330 can operate under the control of the vehicle controller 310 to adjust the vehicle environment and improve the comfort of driving and riding. At the same time, the vehicle controller 310 can communicate with the air conditioning controller through the CAN bus and feedback the vehicle temperature monitored by the temperature sensor to the vehicle controller 310 to adjust the operating state of the air conditioning system.

[0106] The lead-acid circuit breaker 100 provided by the present application comprises a control module 110, a sampling circuit 120 and a circuit breaker 130. The sampling circuit 120 is electrically connected to the control module 110 and is configured to collect battery information of the lead-acid battery 200. One end of the circuit breaker 130 is electrically connected to the lead-acid battery 200, and the other end of the circuit breaker 130 is electrically connected to the vehicle end 300. The control end of the circuit breaker 130 is electrically connected to the control module 110. The control module 110 is configured to control the circuit breaker 130 to open or close the main circuit between the lead-acid battery 200 and the vehicle end 300 according to the battery information. In this way, when the lead-acid battery 200 is over-discharged, the main circuit between the lead-acid battery 200 and the vehicle end 300 can be controlled to be opened or closed in time, so as to avoid over-discharge of the lead-acid battery 200, ensure safe application of the lead-acid battery 200, prolong the service life of the lead-acid battery 200, and improve user experience.

[0107] It can be understood that the lead-acid circuit breaker 100 provided by the above-mentioned embodiments is only an example. The lead-acid circuit breaker 100 is described in the embodiments of the present application in order to more clearly illustrate the technical solutions of the embodiments of the present application, and does not constitute a limitation on the technical solutions provided by the embodiments of the present application. As can be known by those of ordinary skill in the art, with the evolution of the lead-acid circuit breaker 100 and the appearance of new service scenarios, the technical solutions provided by the embodiments of the present application are also applicable to similar technical problems.

[0108] It should be noted that the description order of the following embodiments does not constitute a limitation on the preferred order of the embodiments. The balancing method is described in detail below. At the same time, the protection method of the lead-acid battery provided by the present application can be executed by the lead-acid circuit breaker or the control module or the sampling circuit in the lead-acid circuit breaker.

[0109] Please refer to Figure 3 , Figure 3 The flowchart of the protection method of the lead-acid battery provided by the embodiments of the present application is shown.

[0110] As Figure 3 shown, the present application also provides a protection method of a lead-acid battery, which protects the lead-acid battery by using the lead-acid circuit breaker provided by the present application. The method comprises steps S510 and S520.

[0111] S510, determining whether the lead-acid battery is in an abnormal state according to battery information of the lead-acid battery;

[0112] S520, if the lead-acid battery is in an abnormal state, controlling a circuit breaker to open or close a main circuit between the lead-acid battery and a vehicle end, so as to protect the lead-acid battery.

[0113] Specifically, the application collects battery information of the lead-acid battery through the lead-acid circuit breaker, and determines whether the lead-acid battery is in an abnormal state through the battery information. If the lead-acid battery is in an abnormal state, the opening or closing of the circuit breaker switch in the lead-acid circuit breaker can be controlled to control the on-off of the main circuit between the lead-acid battery and the vehicle end, thereby realizing timely protection of the lead-acid battery, improving the service life of the lead-acid battery, and greatly improving the user experience.

[0114] In the application, the battery information can include current information, voltage information, state of charge (SOC), state of health (SOH) information, and temperature information of the lead-acid battery, and the abnormal state can be understood as over-discharge state, over-current state, etc.

[0115] Meanwhile, when the lead-acid battery is determined to be in an abnormal state, the on-off of the circuit breaker switch can be controlled to realize the on-off of the main circuit between the lead-acid battery and the vehicle end. That is, when the lead-acid battery is in an abnormal state, the application can control the opening of the circuit breaker switch to realize the disconnection of the main circuit between the lead-acid battery and the vehicle end, or control the closing of the circuit breaker switch to realize the disconnection of the main circuit between the lead-acid battery and the vehicle end.

[0116] Specifically, when the lead-acid battery is determined to be in an abnormal state, the on-off of the circuit breaker switch can be controlled according to the vehicle working condition of the lead-acid battery to realize the on-off of the main circuit between the lead-acid battery and the vehicle end, thereby avoiding the lead-acid battery from being in an over-discharge state.

[0117] In some embodiments, controlling the opening or closing of the circuit breaker switch to disconnect or close the main circuit between the lead-acid battery and the vehicle end to protect the lead-acid battery includes: controlling the opening or closing of the circuit breaker switch to disconnect or close the main circuit between the lead-acid battery and the vehicle end according to the vehicle working condition of the lead-acid battery to protect the lead-acid battery.

[0118] In the application, the vehicle working condition can be understood as the working condition of the vehicle where the lead-acid battery is located when the lead-acid battery is abnormal. The vehicle working condition at least includes driving working condition, static working condition, and parking load working condition. The driving working condition can be understood as the working condition of the vehicle where the lead-acid battery is located during driving, the static working condition can be understood as the working condition of the vehicle where the lead-acid battery is located in a long-term parked state, and the parking load working condition can be understood as the working condition of the vehicle where the lead-acid battery is located in a parked state, but the load (such as air conditioning load) in the vehicle is still in a running state.

[0119] Specifically, the application can determine the on-off of the control circuit breaker according to the vehicle working condition in which the lead-acid battery is located, to control the on-off of the main circuit between the lead-acid battery and the vehicle end, so as to protect the lead-acid battery while improving the user's driving experience.

[0120] In some embodiments, according to the vehicle working condition in which the lead-acid battery is located, the control circuit breaker is controlled to open or close the main circuit between the lead-acid battery and the vehicle end to protect the lead-acid battery, including: if the vehicle working condition is driving working condition, the control circuit breaker is closed, and a request instruction for charging the lead-acid battery is sent to the vehicle end to charge the lead-acid battery; if the vehicle working condition is stationary working condition or parking load working condition, the control circuit breaker is opened to disconnect the main circuit between the lead-acid battery and the vehicle end.

[0121] In the application, when it is determined that the lead-acid battery is in an abnormal state, such as over-discharge state, if the vehicle working condition is driving working condition, it can be determined that the lead-acid battery is continuously supplying power to the air conditioning load, and the power continues to decrease, resulting in over-discharge state. At this time, the lead-acid battery does not need to be controlled to be disconnected, and the vehicle generator of the vehicle end can be used to supply power to the lead-acid battery, and at the same time, the vehicle generator can be used to supply power to the air conditioning load, so as to prevent the over-discharge failure of the lead-acid battery; if the vehicle working condition is stationary working condition, the vehicle is in a parked state for a long time, to avoid the vehicle being unable to start next time, the application can control the control circuit breaker to be disconnected to protect the power of the lead-acid battery, so as to ensure that the user can start the vehicle normally next time; if the vehicle working condition is parking load working condition, to avoid the continuous decrease of the power of the lead-acid battery, the application can control the control circuit breaker to be disconnected to disconnect the main circuit between the lead-acid battery and the vehicle end. At the same time, if the load is an air conditioning load, the application also does not need to control the control circuit breaker to be disconnected to disconnect the main circuit between the lead-acid battery and the vehicle end, but only needs to start the vehicle generator to charge the lead-acid battery, and at the same time, the generator can be used to supply power to the air conditioning load to ensure that the user can be provided with a cool environment in hot weather, thereby improving the user experience.

[0122] It should be noted that the vehicle working condition mentioned in the application is not limited to the above three working conditions, and different ways of controlling the on-off of the control circuit breaker can be used according to the actual working condition of the vehicle to protect the lead-acid circuit breaker, which is not limited in the application.

[0123] In some embodiments, the battery information includes voltage information of the lead-acid battery, and the abnormal state includes over-discharge state; wherein, according to the battery information of the lead-acid battery, it is determined whether the lead-acid battery is in an abnormal state, including: according to the voltage information, it is determined whether the total voltage of the lead-acid battery is less than or equal to a preset first threshold; if it is determined that the total voltage of the lead-acid battery is less than or equal to the first threshold, it is determined that the lead-acid battery is in over-discharge state.

[0124] Specifically, in the process of determining whether the lead-acid battery is in the over-discharge state, it can be determined whether the total voltage of the lead-acid battery is less than or equal to a preset first threshold value through the voltage information of the lead-acid battery. If it is less than or equal to the first threshold value, it can be determined that the lead-acid battery is in the over-discharge state, and then the on-off of the circuit breaker can be controlled according to the vehicle operating condition in which the lead-acid battery is located, so as to realize the on-off of the main loop between the lead-acid battery and the vehicle end, thereby avoiding the lead-acid battery in the over-discharge state. The first threshold value can be set according to the properties of the lead-acid battery, which is not specifically limited in the present application.

[0125] In some embodiments, the battery information further includes current information of the lead-acid battery; wherein determining whether the lead-acid battery is in an abnormal state according to the battery information of the lead-acid battery comprises: determining whether the state of charge of the lead-acid battery is less than or equal to a preset second threshold value according to the voltage information and the current information; if the state of charge of the lead-acid battery is less than or equal to the preset second threshold value, it is determined that the lead-acid battery is in the over-discharge state.

[0126] In the present application, in the process of determining whether the lead-acid battery is in the over-discharge state, it can also be determined whether the state of charge of the lead-acid battery is less than or equal to a preset second threshold value. If it is less than or equal to the second threshold value, it can be determined that the lead-acid battery is in the over-discharge state, and then the on-off of the circuit breaker can be controlled according to the vehicle operating condition in which the lead-acid battery is located, so as to realize the on-off of the main loop between the lead-acid battery and the vehicle end, thereby avoiding the lead-acid battery in the over-discharge state. The state of charge of the lead-acid battery can be determined through the voltage information and the current information of the lead-acid battery, and the second threshold value can be set according to actual application, which is not specifically limited in the present application.

[0127] In some embodiments, the abnormal state further includes a current abnormal state; wherein determining whether the lead-acid battery is in an abnormal state according to the battery information of the lead-acid battery comprises: if the vehicle operating condition is a stationary operating condition, determining whether the dark current of the lead-acid battery is greater than or equal to a preset third threshold value according to the current information; if the dark current of the lead-acid battery is greater than or equal to the third threshold value, it is determined that the lead-acid battery is in the current abnormal state.

[0128] In the present application, when the vehicle in which the lead-acid battery is located is in a static working condition, the sampling circuit can enter a regular wake-up mode and regularly perform wake-up work to regularly sample the lead-acid battery. When it is determined through the sampled current information that the dark current of the lead-acid battery is greater than or equal to a preset third threshold value, it is determined that the lead-acid battery is in an abnormal state, and a current abnormal state is triggered, that is, the lead-acid battery is in an overcurrent state. At this time, the control module can be woken up by IIC communication to enter a working state. The control module records the current overcurrent of the lead-acid battery and performs fault alarm, and then sends fault alarm information to the user terminal device through the wireless communication module to remind the user that the vehicle dark current is abnormal.

[0129] In the present application, the dark current (or static current) can be understood as a small current generated by some electrical equipment (such as an anti-theft system, GPS, remote monitoring, etc.) in a working state when the vehicle is in a powered-off state. The third threshold value can be set according to actual application, which is not specifically limited in the present application.

[0130] In some embodiments, after determining whether the dark current of the lead-acid battery is greater than or equal to the preset third threshold value, the method further comprises: if the dark current of the lead-acid battery is less than the third threshold value, determining whether the lead-acid battery is in an over-discharge state according to the voltage information or / and the current information.

[0131] Specifically, in the process of determining whether the dark current of the lead-acid battery is greater than or equal to the preset third threshold value, if the dark current is less than the third threshold value, the voltage information or / and the current information can be used to determine whether the total voltage of the lead-acid battery is less than or equal to a first threshold value, or whether the state of charge of the lead-acid battery is less than or equal to a second threshold value, and then it can be determined whether the lead-acid battery is in an over-discharge state. Therefore, the on-off of the circuit breaker can be controlled according to the working condition of the vehicle in which the lead-acid battery is located, so as to control the on-off of the main circuit between the lead-acid battery and the vehicle end, thereby avoiding the lead-acid battery in an over-discharge state.

[0132] In some embodiments, the protection method of the lead-acid battery further comprises: if the vehicle working condition is a static working condition or a parked load working condition, and the abnormal state is an over-discharge state, controlling the lead-acid circuit breaker to enter a hibernation low-power consumption mode.

[0133] In the present application, when the lead-acid battery is in an over-discharge state, if the vehicle in which the lead-acid battery is located is in a static state or a parked load working condition, the circuit breaker can be controlled to be disconnected to disconnect the main circuit between the lead-acid battery and the vehicle end. At the same time, the present application can control the lead-acid circuit breaker to enter a hibernation low-power consumption mode to protect the power of the lead-acid battery, thereby ensuring that the user can normally start the vehicle next time.

[0134] In some embodiments, the protection method of the lead-acid battery further comprises: if the lead-acid battery is in an abnormal state, sending alarm information of the lead-acid battery being in the abnormal state to the vehicle end or / and the user terminal.

[0135] In the present application, a wireless communication module can be provided in the lead-acid circuit breaker. The wireless communication module can be a Bluetooth module or a 4G module. After the lead-acid circuit breaker collects the battery information of the lead-acid battery, the battery information can be sent to the vehicle controller of the vehicle end or sent to the user terminal by the wireless communication module. At the same time, when it is determined that the lead-acid battery is in an abnormal state, the alarm information of the abnormal state of the lead-acid battery can be sent to the vehicle end or / and the user terminal by the wireless communication module to remind the user that the lead-acid battery has been protected.

[0136] In addition, the user can also send instructions to the lead-acid circuit breaker through the user terminal to wake up the control module, and wake up the analog front-end module through the control module, so that the analog front-end module exits the low-power mode and controls the circuit breaker switch to close, so that the vehicle can start the ignition again. The user terminal can communicate with the lead-acid circuit breaker through wireless communication, and the user can realize one-key starting of the vehicle through the WeChat applet on the user terminal.

[0137] In some embodiments, as shown in Figure 2 The present application also provides a lead-acid circuit breaker system, which comprises the lead-acid circuit breaker provided by the present application, and the lead-acid circuit breaker is arranged in the main circuit between the lead-acid battery and the vehicle end.

[0138] In the present application, the lead-acid circuit breaker system can be composed of a lead-acid battery and a lead-acid circuit breaker. The lead-acid circuit breaker system can be arranged at the battery end of the vehicle, so as to realize continuous intelligent online detection of the voltage, current and temperature state of the lead-acid battery in the driving state and the parking state of the vehicle, and real-time estimation of the state of charge and the battery health degree of the lead-acid battery. In addition, the lead-acid circuit breaker system can realize information interaction with the vehicle through communication and information interaction with the user terminal through the wireless communication module. In addition, the circuit breaker switch in the lead-acid circuit breaker is arranged on the negative main circuit of the lead-acid battery, so as to timely control the circuit breaker switch to open when the lead-acid battery has serious under-voltage, low state of charge and other faults, so as to avoid over-discharge of the lead-acid battery, thereby ensuring the safe application of the lead-acid battery.

[0139] The above is only a specific embodiment of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art can easily think of various equivalent modifications or replacements within the technical scope disclosed in the present application, and these modifications or replacements shall be covered within the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A lead acid circuit breaker (100) characterized by, The lead-acid circuit breaker (100) comprises: a control module (110); a sampling circuit (120) electrically connected to the control module (110) and configured to collect battery information of a lead-acid battery (200); a circuit breaker (130) having one end electrically connected to the lead-acid battery (200) and the other end electrically connected to a vehicle end (300), and having a control end electrically connected to the control module (110); wherein the control module (110) is configured to control the circuit breaker (130) to open or close a main circuit between the lead-acid battery (200) and the vehicle end (300) according to the battery information.

2. The lead acid circuit breaker (100) of claim 1, characterized in that, The sampling circuit (120) comprises a shunt (122) and an analog front-end module (121), and the battery information comprises current information of the lead-acid battery (200); wherein one end of the shunt (122) is electrically connected to the lead-acid battery (200) and the analog front-end module (121) respectively, the other end of the shunt (122) is electrically connected to one end of the circuit breaker (130) and the analog front-end module (121) respectively, and the analog front-end module (121) is electrically connected to the control module (110); The analog front-end module (121) is configured to collect a differential signal between the two ends of the shunt (122) to generate the current information.

3. The lead acid circuit breaker (100) of claim 2, characterized in that, The sampling circuit (120) further comprises a thermistor (NTC), and the battery information further comprises temperature information of the lead-acid battery (200); wherein the thermistor (NTC) is electrically connected to the analog front-end module (121) at both ends, and is arranged at a negative electrode of the lead-acid battery (200) to collect the temperature information.

4. The lead acid circuit breaker (100) of claim 1, wherein, The sampling circuit (120) further comprises a voltage collection module, the lead-acid battery (200) comprises a first battery pack (210) and a second battery pack (220), and the battery information further comprises voltage information of the lead-acid battery (200); wherein a first end of the voltage collection module is electrically connected to a positive electrode of the first battery pack (210) and a negative electrode of the second battery pack (220) respectively, a second end of the voltage collection module is electrically connected to a positive electrode of the second battery pack (220), a third end of the voltage collection module is electrically connected to the control module (110), a negative electrode of the first battery pack (210) is electrically connected to the circuit breaker (130), and the voltage collection module is configured to collect the voltage information.

5. The lead acid circuit breaker (100) of claim 4, characterized in that, The lead-acid circuit breaker (100) further comprises a power supply module (140); wherein one end of the power supply module (140) is electrically connected to a positive electrode of the second battery pack (220), and the other end of the power supply module (140) is electrically connected to a power supply end of the control module (110).

6. The lead acid circuit breaker (100) of claim 1, wherein, The circuit breaker (130) comprises a plurality of MOS tubes, and the lead-acid circuit breaker (100) further comprises a driving module (150); The source of each MOS tube is electrically connected to the lead-acid battery (200), the drain of each MOS tube is electrically connected to the vehicle end (300), and the gate of each MOS tube is electrically connected to one end of the driving module (150), and the other end of the driving module (150) is electrically connected to the control module (110).

7. The lead acid circuit breaker (100) of claim 1, wherein, The lead-acid circuit breaker (100) further comprises a LIN transceiver; One end of the LIN transceiver is electrically connected to the control module (110), and the other end of the LIN transceiver is electrically connected to the vehicle end (300); or / and, The lead-acid circuit breaker (100) further comprises a CAN transceiver; One end of the CAN transceiver is electrically connected to the control module (110), and the other end of the CAN transceiver is electrically connected to the vehicle end (300); or / and, The lead-acid circuit breaker (100) further comprises a wireless communication module (160); The wireless communication module (160) is electrically connected to the control module (110).

8. The lead acid circuit breaker (100) according to any one of claims 1-7, characterized in that, The vehicle end (300) is provided with a vehicle controller (310), a vehicle generator (320) and an air conditioning load (330); The first end of the vehicle controller (310), one end of the vehicle generator (320) and one end of the air conditioning load (330) are electrically connected to the positive electrode of the lead-acid battery (200), the second end of the vehicle controller (310), the other end of the vehicle generator (320) and the other end of the air conditioning load (330) are electrically connected to the other end of the circuit breaker (130), and the third end of the vehicle controller (310) is electrically connected to the control module (110).

9. A method of protecting a lead-acid battery, characterized by, The lead-acid circuit breaker of any one of claims 1-8 is used to protect the lead-acid battery, and the method comprises: Determining whether the lead-acid battery is in an abnormal state according to battery information of the lead-acid battery; If the lead-acid battery is in an abnormal state, controlling the circuit breaker to open or close the main circuit between the lead-acid battery and the vehicle end to protect the lead-acid battery.

10. The method of protecting a lead-acid battery of claim 9, wherein, The control of the circuit breaker to open or close the main circuit between the lead-acid battery and the vehicle end to protect the lead-acid battery comprises: Controlling the circuit breaker to open or close the main circuit between the lead-acid battery and the vehicle end to protect the lead-acid battery according to the vehicle working condition in which the lead-acid battery is located.

11. The method of protecting a lead-acid battery of claim 10, wherein, The control of the circuit breaker to open or close the main circuit between the lead-acid battery and the vehicle end to protect the lead-acid battery according to the vehicle working condition in which the lead-acid battery is located comprises: If the vehicle working condition is a driving working condition, controlling the circuit breaker to close and sending a request instruction to the vehicle end to charge the lead-acid battery to charge the lead-acid battery; If the vehicle working condition is a stationary working condition or a parking load working condition, controlling the circuit breaker to open to disconnect the main circuit between the lead-acid battery and the vehicle end.

12. The method of protecting a lead-acid battery of claim 11, wherein, The battery information comprises voltage information of the lead-acid battery, and the abnormal state comprises an over-discharge state. The method comprises: determining, according to the voltage information, whether the total voltage of the lead-acid battery is less than or equal to a preset first threshold value; if it is determined that the total voltage of the lead-acid battery is less than or equal to the first threshold value, determining that the lead-acid battery is in the over-discharge state.

13. The method of protecting a lead-acid battery of claim 12, wherein, The battery information further comprises current information of the lead-acid battery. The method comprises: determining, according to the voltage information and the current information, whether the state of charge of the lead-acid battery is less than or equal to a preset second threshold value; if the state of charge of the lead-acid battery is less than or equal to the preset second threshold value, determining that the lead-acid battery is in the over-discharge state.

14. The method of protecting a lead-acid battery of claim 13, wherein, The abnormal state further comprises a current abnormal state. The method comprises: if the vehicle working condition is a stationary working condition, determining, according to the current information, whether the dark current of the lead-acid battery is greater than or equal to a preset third threshold value; if the dark current of the lead-acid battery is greater than or equal to the third threshold value, determining that the lead-acid battery is in the current abnormal state.

15. The method of protecting a lead-acid battery of claim 14, wherein, The method further comprises: if the dark current of the lead-acid battery is less than the third threshold value, determining, according to the voltage information or / and the current information, whether the lead-acid battery is in the over-discharge state.

16. The method of protecting a lead-acid battery of claim 11, wherein, The method further comprises: if the vehicle working condition is a stationary working condition or a parked load working condition, and the abnormal state is a discharge state, controlling the lead-acid circuit breaker to enter a dormant low-power consumption mode.

17. The method of protecting a lead-acid battery according to any one of claims 9-16, characterized in that, The method further comprises: if the lead-acid battery is in the abnormal state, sending, to the vehicle end or / and a user terminal, alarm information that the lead-acid battery is in the abnormal state.

18. A lead acid circuit breaker system characterized by, The lead-acid circuit breaker according to any one of claims 1-8 is arranged in a main circuit between the lead-acid battery and a vehicle end.

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