Low voltage battery management system

Abstract

The utility model discloses a low -voltage battery management system relates to battery management technical field, include: battery package, battery package is linked with analog front end module, analog front end module is used for monitoring the data information of every battery monomer, MCU module, MCU module is linked with charge -discharge module, is used for processing data information, charge -discharge module is used for controlling battery package adjustment charging strategy or discharge strategy, self -discharge module, self -discharge module is linked with battery package and MCU module respectively, is used for the automatic discharge of battery package, the utility model solves the technical problem of higher power consumption of battery management system in relevant technology.

Description

Technical Field

[0001] This utility model relates to the field of battery management technology, and more specifically, to a low-voltage battery management system. Background Technology

[0002] With the development of drone technology, drones are widely used in agricultural plant protection, logistics distribution, emergency rescue and disaster relief, and inspection operations. Currently, drone battery management systems use lithium-ion batteries, which have advantages such as high energy density, small size, light weight, and long cycle life.

[0003] However, lithium-ion batteries face various safety risks during use, including but not limited to overcharging and over-discharging. Furthermore, during charging and discharging, the MOSFETs (Metal-Oxide-Semiconductor Field-Effect Transistors) in the circuit generate a significant amount of heat. Poor heat dissipation not only affects thermal efficiency but also indirectly increases power consumption. These risks not only reduce battery performance and shorten its lifespan but may also trigger thermal runaway, leading to battery swelling, fire, or explosion. In addition, if the battery management system itself has high power consumption, it will consume more electricity, resulting in a reduction in actual flight time.

[0004] There is currently no effective solution to the above problems. Utility Model Content

[0005] This utility model provides a low-voltage battery management system to at least solve the technical problem of high power consumption in battery management systems in related technologies.

[0006] According to one aspect of the present invention, a low-voltage battery management system is provided, comprising: a battery pack connected to an analog front-end module, wherein the battery pack includes: multiple battery cells; the analog front-end module is used to monitor data information of each battery cell; an MCU module connected to a charge / discharge module for processing data information; a charge / discharge module for controlling the battery pack to adjust its charging or discharging strategy; and a self-discharge module connected to both the battery pack and the MCU module for automatically discharging the battery pack.

[0007] Furthermore, the charging and discharging module also includes multiple MOSFETs, wherein all MOSFETs constitute a MOSFET array, and the MOSFET array adopts a top heat dissipation packaging method.

[0008] Furthermore, the low-voltage battery management system also includes: a Bluetooth module, which is used to send the data information processed by the MCU module to the Bluetooth receiving device; and a signal processing module, which is connected to the battery pack and the analog front-end module respectively, and is used to preprocess the signal data of the collected battery cells.

[0009] Furthermore, the low-voltage battery management system also includes: a pre-charge circuit module, which is connected to the pre-discharge circuit module and the MCU module respectively, and is used to control the charging process of the battery pack from the dormant state to the active state; a pre-discharge circuit module, which is used to control the discharging process of the battery pack; wherein, the pre-charge circuit module also includes: a first MOSFET, and the pre-discharge circuit module also includes: a second MOSFET, the drain of the first MOSFET being connected to the drain of the second MOSFET.

[0010] Furthermore, the low-voltage battery management system also includes a MOSFET driver module, which is used to drive all MOSFETs. The MOSFET driver module further includes a first MOSFET driver and a second MOSFET driver. The first MOSFET driver is connected to the gate of the first MOSFET, and the second MOSFET driver is connected to the gate of the second MOSFET. The first MOSFET driver and the second MOSFET driver are respectively connected to the gates of multiple MOSFETs in the MOSFET array, and each MOSFET is connected to each other through a circuit.

[0011] Furthermore, the low-voltage battery management system also includes: a CAN transceiver, which is connected to the connector and is used to receive data transmitted by the connector and the digital isolation module; a connector, which is connected to an external device and is used to receive external data and data sent by the CAN transceiver; and a digital isolation module, which is connected to both the CAN transceiver and the MCU module and is used to isolate the MCU module from the CAN transceiver.

[0012] Furthermore, the low-voltage battery management system also includes multiple isolation optocouplers, which are connected to the MCU module and the connector respectively, for isolating the MCU module and the connector.

[0013] Furthermore, the low-voltage battery management system also includes: multiple storage modules for storing data generated by the low-voltage battery management system; a button module connected to the MCU module; and a total voltage detection module connected to the battery pack for detecting the total voltage of the battery pack.

[0014] Furthermore, the low-voltage battery management system also includes: a step-down circuit, which is connected to a voltage regulator to convert the input voltage of the low-voltage battery management system into a low voltage; and multiple voltage regulators, which are used to adjust the low voltage to supply power to different power sources.

[0015] Furthermore, the low-voltage battery management system also includes a Fly-Buck buck converter, which is used to convert the input voltage to the target voltage.

[0016] In this utility model, the low-voltage battery management system includes: a battery pack connected to an analog front-end module; an analog front-end module for monitoring data information of each battery cell; an MCU module connected to a charge / discharge module for processing data information; a charge / discharge module for controlling the battery pack to adjust its charging or discharging strategy; and a self-discharge module connected to both the battery pack and the MCU module for automatically discharging the battery pack.

[0017] In this invention, a low-voltage battery management system is designed to efficiently manage the charging and discharging of the battery pack, improve heat dissipation efficiency, and reduce its own power consumption. By designing a self-discharge module, the low-voltage battery management system can intelligently adjust the self-discharge rate of the battery, improve the safety of the battery in a long-term idle state, and thus solve the technical problem of high power consumption in battery management systems in related technologies. Attached Figure Description

[0018] The accompanying drawings, which are included to provide a further understanding of the present invention and constitute a part of this invention, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings:

[0019] Figure 1 This is a schematic diagram of an optional low-voltage battery management system according to an embodiment of the present utility model;

[0020] Figure 2 This is a structural diagram of an optional charging and discharging module according to an embodiment of the present utility model;

[0021] Figure 3 This is a structural diagram of an optional pre-charging circuit module according to an embodiment of the present utility model;

[0022] Figure 4 This is a structural diagram of an optional preamplifier circuit module according to an embodiment of the present utility model;

[0023] Figure 5 This is a structural diagram of an optional MOS transistor driving module according to an embodiment of the present utility model;

[0024] Figure 6 This is a schematic diagram of an optional low-voltage battery management system according to an embodiment of the present utility model;

[0025] Figure 7This is a schematic diagram of the structure of an optional low-voltage battery management system according to an embodiment of the present utility model.

[0026] The components include: 1. Low-voltage battery management system; 10. Battery pack; 20. Analog front-end module; 30. MCU module; 40. Charge / discharge module; 50. Self-discharge module; 60. Bluetooth module; 70. Signal processing module; 80. Precharge circuit module; 90. Pre-discharge circuit module; 100. MOSFET driver module; 110. CAN transceiver; 120. Connector; 130. Digital isolation module; 140. Isolation optocoupler; 150. Storage module; 160. Button module; 170. Total voltage detection module; 180. Buck circuit; 190. Voltage regulator; 200. Fly-Buck buck converter; 101. Battery cell; 401. MOSFET; 801. First MOSFET; 901. Second MOSFET; 100a. First MOSFET driver; 100b. Second MOSFET driver. Detailed Implementation

[0027] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the protection scope of the present invention.

[0028] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this utility model are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the utility model described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0029] This invention presents a low-voltage battery management system with self-discharge and Bluetooth functionality, applicable to drones. Users can monitor the battery status in real time via the Bluetooth module and intelligently adjust the self-discharge rate through the self-discharge function, ensuring the battery remains safe and in optimal condition even after prolonged periods of inactivity. Furthermore, the MOSFETs in the charging / discharging module utilize a top-heat-dissipating packaging method, shortening the thermal path from the die junction to the heat sink. Separating the heat transfer path from the current also enhances heat dissipation, thereby improving electrical performance and safety.

[0030] The present invention will now be described in detail with reference to various embodiments.

[0031] Example 1

[0032] According to an embodiment of the present invention, a low-voltage battery management system is provided.

[0033] Figure 1 This is a schematic diagram of an optional low-voltage battery management system according to an embodiment of the present invention, as shown below. Figure 1 As shown, the low-voltage battery management system 1 includes: a battery pack 10, an analog front-end module 20, an MCU (Micro Controller Unit) module 30, a charge / discharge module 40, and a self-discharge module 50. The battery pack 10 is connected to the analog front-end module 20. The battery pack 10 includes multiple battery cells 101. The analog front-end module 20 monitors the data information of each battery cell 101 and transmits the data information to the MCU module 30. The MCU module 30 is connected to the charge / discharge module 40 and processes the data information to generate different control commands. The charge / discharge module 40 controls the battery pack 10 to adjust its charging or discharging strategy according to the control commands. The self-discharge module 50 is connected to both the battery pack 10 and the MCU module 30 and automatically discharges the battery pack 10 according to the control commands.

[0034] In this embodiment, the battery pack 10 is composed of multiple battery cells 101. The battery cells can be connected in series, in parallel, or in a series-parallel combination to achieve the required voltage and capacity. The analog front-end module 20 can monitor the data information of each battery cell 101, such as voltage, current, and temperature. The MCU module 30 is connected to the charge-discharge module 40 and is responsible for analyzing and processing the battery data information from the analog front-end module 20, and making charge-discharge decisions based on the data information to ensure that the battery pack 10 operates under safe and efficient conditions. The self-discharge module 50 self-discharges the battery to a first preset value (the value can be preset) when the battery pack is fully charged for more than one day, and continues to self-discharge to a second preset value (smaller than the first preset value) when the battery pack is fully charged for more than seven days. Through the self-discharge module 50, the battery discharge process can be actively controlled when the UAV is not used for a long time, avoiding safety hazards caused by excessive battery voltage, and also protecting the battery from the effects of overcharging, extending battery life, and thus solving the technical problem of high power consumption in battery management systems in related technologies.

[0035] Optionally, the charging and discharging module 40 further includes a plurality of MOSFETs 401, wherein all MOSFETs 401 constitute a MOSFET array, and the MOSFET array adopts a top heat dissipation packaging method.

[0036] In this embodiment, the charging and discharging module 40 includes multiple MOS (Metal-Oxide-Semiconductor Field-Effect Transistor) transistors 401. These MOS transistors 401 together form a MOS transistor array. When the UAV is charging or discharging, the MOS transistors 401 will adjust the current through the battery pack 10 precisely by turning them on or off according to the instructions from the MCU module 30.

[0037] Figure 2 This is a structural diagram of an optional charging and discharging module according to an embodiment of the present utility model, as shown below. Figure 2 As shown, the charging and discharging module 40 includes four MOS transistors 401, which are interconnected and together form a MOS transistor array.

[0038] In this embodiment, to address the high heat generated during high-current charging and discharging, the MOSFET array adopts a top-opening leadless transistor (TOLT) design. By shortening the heat transfer path between the MOSFET junction and the heat sink, the heat dissipation capacity is improved, ensuring that the charging and discharging module 40 can maintain a low temperature even under high-intensity charging and discharging conditions, thereby improving the safety and reliability of system operation.

[0039] Optionally, the low-voltage battery management system 1 further includes: a Bluetooth module 60, which is used to send the data information processed by the MCU module 30 to a Bluetooth receiving device; and a signal processing module 70, which is connected to the battery pack 10 and the analog front-end module 20 respectively, and is used to preprocess the signal data of the collected battery cells 101.

[0040] In this embodiment, the Bluetooth module 60 establishes a communication interface with the MCU module 30, such as using the UART (Universal Asynchronous Receiver / Transmitter) communication protocol. After the MCU module 30 processes the data information of the battery cell 101 from the analog front-end module 20, it sends the processing result to the Bluetooth module 60 through this interface for wireless transmission. After receiving the data, the Bluetooth module 60 uses its wireless signal capability to transmit the real-time status of the battery to an external Bluetooth receiving device, including but not limited to information such as battery voltage, temperature, and remaining power, so that the user can remotely monitor the health status of the battery.

[0041] In this embodiment, a signal processing module 70 is provided between the battery cell 101 and the analog front-end module 20. Before the signal is transmitted to the analog front-end module 20, the signal processing module 70 reduces noise in the signal through filter capacitors and other filter components, improves data quality, ensures that the analog front-end module 20 receives a clean signal, and reduces erroneous readings.

[0042] Optionally, the low-voltage battery management system 1 further includes: a pre-charge circuit module 80, which is connected to the pre-discharge circuit module 90 and the MCU module 30 respectively, and is used to control the charging process of the battery pack 10 from a dormant state to an active state; and a pre-discharge circuit module 90, which is used to control the discharging process of the battery pack 10; wherein the pre-charge circuit module 80 further includes: a first MOSFET 801, and the pre-discharge circuit module 90 further includes: a second MOSFET 901, the drain of the first MOSFET 801 being connected to the drain of the second MOSFET 901.

[0043] In this embodiment, Figure 3 This is a structural diagram of an optional pre-charging circuit module according to an embodiment of the present utility model, as shown below. Figure 3 As shown, the pre-charging circuit module 80 includes a first MOSFET 801, which is used to control the pre-charging process of the battery pack 10 during startup. The first MOSFET 801 is electrically connected to the pre-discharge circuit module 90 and the MCU module 30. The MCU module 30 adjusts the on and off states of the first MOSFET 801 through control signals, thereby controlling the charging rate and amount of charge when the battery pack 10 transitions from a dormant state to an active state.

[0044] In this embodiment, Figure 4 This is a structural diagram of an optional preamplifier circuit module according to an embodiment of the present invention, such as... Figure 4 As shown, the pre-discharge circuit module 90 includes a second MOSFET 901, which is used to control the first discharge process of the battery pack 10. The drain of the second MOSFET 901 is connected to the drain of the first MOSFET 801, forming a tight electrical path. During pre-discharge, the pre-discharge circuit module ensures the stability of the battery discharge process by adjusting the second MOSFET 901.

[0045] Optionally, the low-voltage battery management system 1 further includes: a MOSFET driving module 100, which drives all MOSFETs 401. The MOSFET driving module 100 further includes: a first MOSFET driver 100a and a second MOSFET driver 100b. The first MOSFET driver 100a is connected to the gate of the first MOSFET 801, and the second MOSFET driver 100b is connected to the gate of the second MOSFET 901. The first MOSFET driver 100a and the second MOSFET driver 100b are respectively connected to the gates of multiple MOSFETs 401 in the MOSFET array, and each MOSFET 401 is connected to each other through a line.

[0046] In this embodiment, Figure 5 This is a structural diagram of an optional MOS transistor driving module according to an embodiment of the present invention, as shown below. Figure 5 As shown, the MOS transistor driving module 100 is used to drive the MOS transistor 401 that operates under high current and high voltage. It includes a first MOS transistor driver 100a and a second MOS transistor driver 100b. The first MOS transistor driver 100a is connected to the gate of the first MOS transistor 801, and the second MOS transistor driver 100b is connected to the gate of the second MOS transistor 901. These two drivers are responsible for driving the effect transistors in the precharge circuit module 80 and the pre-discharge circuit module 90, respectively.

[0047] In this embodiment, the gate of each MOSFET 401 is connected to the corresponding driver in the MOSFET driving module 100, ensuring that the MCU module 30 can accurately control the switching state of each MOSFET 401 through the MOSFET driving module 100, thereby controlling the current path in the entire battery management system.

[0048] Optionally, the low-voltage battery management system 1 further includes: a CAN (Controller Area Network, a serial communication protocol) transceiver 110, which is connected to a connector 120 and is used to receive data transmitted by the connector 120 and the digital isolation module 130; a connector 120, which is connected to an external device and is used to receive external data and data sent by the CAN transceiver 110; and a digital isolation module 130, which is connected to both the CAN transceiver 110 and the MCU module 30 and is used to isolate the MCU module 30 from the CAN transceiver 110.

[0049] In this embodiment, the low-voltage battery management system 1 further includes a CAN transceiver 110, a connector 120, and a digital isolation module 130. The CAN transceiver 110 is responsible for transmitting internal and external data of the battery management system. One end of the CAN transceiver 110 is connected to the connector 120, and the other end is connected to the digital isolation module 130. This connection method allows the CAN transceiver to receive external data from the connector, and it can also transmit data information processed by the MCU module 30, such as battery status information, to the outside.

[0050] In this embodiment, the digital isolation module 130 is used to establish an electrical isolation barrier between the MCU module 30 and the CAN transceiver 110 to prevent high voltage signals from entering the MCU module 30 and protect the core control unit from damage. One side of the digital isolation module 130 is connected to the CAN transceiver 110 to receive data from the CAN network, and the other side is connected to the MCU module (30) to safely transmit data to the MCU module 30. At the same time, it also transmits the instructions and data of the MCU module 30 to the CAN transceiver 110 in reverse to realize bidirectional communication.

[0051] In this embodiment, the MCU module 30 can be woken up by receiving a CAN signal through the digital isolation module 130, or by waking up the MCU module 30 through the button module 160.

[0052] Optionally, the low-voltage battery management system 1 further includes: a plurality of isolation optocouplers 140, which are respectively connected to the MCU module 30 and the connector 120, for isolating the MCU module 30 and the connector 120.

[0053] In this embodiment, the isolation optocoupler 140 converts electrical signals into optical signals and then back into electrical signals through photoelectric conversion, thereby enabling safe signal transmission between different electronic components. Especially in environments with high voltage differences, such as when the connector communicates with external devices, multiple isolation optocouplers 140 are integrated on the circuit board to ensure that each signal path from the connector 120 to the MCU module 30 is equipped with an isolation optocoupler 140, thus providing comprehensive isolation protection for all data transmission.

[0054] Optionally, the low-voltage battery management system 1 further includes: multiple storage modules 150 for storing data generated by the low-voltage battery management system 1; a button module 160 connected to the MCU module 30; and a total voltage detection module 170 connected to the battery pack 10 for detecting the total voltage of the battery pack 10.

[0055] In this embodiment, the storage module 150 is used to record and save key data generated during system operation. The button module 160 provides users with an intuitive operation interface (i.e., buttons). By pressing the button, the low-voltage battery management system 1 is woken up. After waking up the low-voltage battery management system 1, the charging and discharging module 40 can be closed by pressing the button. It can also be used with LED lights to indicate various statuses or faults. Different short press or long press logics realize different functions (such as system start-up, status query, emergency stop, etc.). The total voltage detection module 170 is responsible for monitoring the total voltage level of the battery pack 10 in real time.

[0056] In this embodiment, the storage module 150 can be a variety of non-volatile storage devices such as EEPROM (Electrically Erasable Programmable Read-Only Memory) and Flash Memory. Whenever the system runs, monitors, or performs any operation, the MCU module 30 generates corresponding data records and saves these records in the storage module 150 through communication protocols (such as SPI (Serial Peripheral Interface) or I2C (Inter-Integrated Circuit). For example, during pre-charge or pre-discharge, the MCU module 30 records data such as the operating state of the MOSFET, changes in charging / discharging current, and battery temperature to facilitate later analysis and troubleshooting.

[0057] Optionally, the low-voltage battery management system 1 further includes: a step-down circuit 180 connected to a voltage regulator 190 for converting the input voltage of the low-voltage battery management system 1 into a low voltage; and multiple voltage regulators 190 for adjusting the low voltage to supply power to different power sources.

[0058] In this embodiment, the input terminal of the step-down circuit 180 is connected to the output of the battery pack 10, and the output terminal is connected to multiple voltage regulators 190. Through the combination of the step-down circuit 180 and the voltage regulators 190, it is ensured that the internal circuit of the system can obtain a stable and accurate low voltage power supply (such as 3.3V), which reduces the circuit failure rate caused by voltage instability and improves the reliability of the system.

[0059] Optionally, the low-voltage battery management system 1 also includes a Fly-Buck buck converter 200, which is used to convert the input voltage to a target voltage.

[0060] In this embodiment, the Fly-Buck buck converter 200 is a DC-DC converter (a DC-DC converter that converts high-voltage (low-voltage) DC power to low-voltage (high-voltage) DC power) that can achieve both voltage boosting and bucking functions. It is suitable for applications with a wide power supply voltage range and requiring isolation. The input terminal of the Fly-Buck buck converter 200 is connected to the output of the battery pack 10, and the output terminal provides the target voltage to external devices (such as a drone control system) as needed.

[0061] Figure 6 This is a schematic diagram of an optional low-voltage battery management system according to an embodiment of the present invention, as shown below. Figure 6 As shown, the low-voltage battery management system 1 includes: a battery pack 10, an analog front-end module 20, an MCU module 30, a charge / discharge module 40, a self-discharge module 50, a Bluetooth module 60, a signal processing module 70, a pre-charge circuit module 80, a pre-discharge circuit module 90, a MOSFET driver module 100, a CAN transceiver 110, a connector 120, a digital isolation module 130, an isolation optocoupler 140, a storage module 150, a button module 160, a total voltage detection module 170, a step-down circuit 180, a voltage regulator 190, and a Fly-Buck step-down converter 200, etc.

[0062] like Figure 6As shown, the signal processing module 70 collects battery data from individual cells in the battery pack 10, performs filtering and other processing on the battery data to reduce noise, and sends the processed signal to the analog front-end module 20. The analog front-end module 20 receives a clean signal and sends it to the MCU module 30. Simultaneously, the total voltage detection module 170 detects the total voltage of the battery pack and sends it to the MCU module 30. The MCU module 30 generates control commands based on the obtained battery data, controlling the MOSFET driver module 100 to drive the MOSFET 401 in the charge / discharge module 40 to achieve charging or discharging, driving the first MOSFET 801 in the pre-charge circuit module 80 to achieve charging (first charge, i.e., activating the battery), and driving the second MOSFET 901 in the pre-discharge circuit module 90 to achieve discharging. Additionally, after detecting that the battery pack has been fully charged for a certain period of time, the self-discharge module 50 is controlled to perform self-discharge to ensure battery safety. Furthermore, the data acquired by the MCU module can also be transmitted via the Bluetooth module 60. The output to Bluetooth devices can display battery data and other information in real time. In addition to waking up the MCU module 30 via the button module 160, the MCU module 30 can also be woken up via the CAN signal sent by the CAN transceiver 110 received by the isolation optocoupler 140. One end of the CAN transceiver 110 is connected to the connector 120, and the other end is connected to the digital isolation module 130. The digital isolation module 130 is connected to the MCU module 30 to establish an electrical isolation barrier to prevent high voltage signals from entering the MCU module 30 and protect the core control unit from damage. The step-down circuit 180 and the voltage regulator 190 can be used to convert the input voltage of the low-voltage battery management system 1 to a low voltage to power the constant power supply (the constant power supply powers each module in the working state), while the Fly-Buck step-down converter 200 is used to convert the input voltage to the target voltage to power the controllable power supply (the controllable power supply can be turned off in the sleep state). In addition, all data generated in the entire system can be stored in the storage module 150.

[0063] Figure 7 This is a schematic diagram of an optional low-voltage battery management system according to an embodiment of the present invention, such as... Figure 7As shown, the low-voltage battery management system includes: a battery pack, an analog front-end module, an MCU module, a charge / discharge module, a self-discharge module, a Bluetooth module, a signal processing module, a pre-charge circuit module, a pre-discharge circuit module, a MOSFET driver, a CAN transceiver, connectors, a digital isolation module, an isolation optocoupler, an EEPROM, a FLASH Memory, buttons, a total voltage detection module, a buck circuit, a voltage regulator, a Fly-Buck buck converter driver, a transformer, etc. In this module, P+ refers to the positive terminal of the power rail (the power source for the electronic components), P- refers to the negative terminal of the power rail, B+ refers to the positive terminal of the battery pack, and B- refers to the negative terminal of the battery pack. The signal processing module collects signal data (such as temperature, voltage, and current) from each battery cell, preprocesses it, and then transmits it to the analog front-end module. The analog signal is converted into a digital signal and transmitted to the MCU module via a communication protocol (such as I2C). In the analog front-end module, differential signals can be received through the SRN and SRP ports to improve the reliability and accuracy of signal transmission. The MCU module is used for core logic control, processes the data transmitted from the analog front-end module and the total voltage detection module, executes operations such as SOC (State of Charge) estimation and fault diagnosis algorithms, and generates drive instructions and precharge / pre-discharge control signals. It outputs signals to the MOSFET driver to control the switching operation of the MOSFET.MOSFET drivers include INA (Input A), INB (Input B), and ENA (Enable). A) Ports: INA is one input terminal of the MOSFET driver, used to receive control signals. INB is the other input terminal corresponding to INA, also used to receive control signals. In a dual-input configuration, the state of INB is complementary to that of INA. ENA is the enable input terminal, used to enable or disable the MOSFET driver. The MCU module includes CAN_RX port, CAN_TX port, MCU_Key_Input port, MCU_CAN_Wake port, DO port, and DI port. The CAN_RX port receives the CAN signal sent from the TXD port of the CAN transceiver after filtering by the digital isolation module, processes it, and outputs it to the digital isolation module through the CAN_TX port, and then outputs it to the RXD port of the CAN transceiver. The MCU_Key_Input port represents one input port of the MCU module. This port receives the input signal from the button (i.e., the button module) to wake up the MCU module. It can also receive the CAN signal input to the MCU_CAN_Wake port of the MCU module through the isolation optocoupler to wake up the MCU module. The DI port is used to receive the CAN signal through the isolation optocoupler. The DO port is used to output the M... The CU module transmits data to an isolated optocoupler; the CAN transceiver connects to a connector for data transmission between the system and external systems; a buck circuit steps down the battery pack voltage (e.g., 10V) and, through diodes and a regulator, obtains a lower voltage to power the constant power supply (e.g., VDD_+3V3, VCC_3V3_STBY (3.3V standby power), VDDA_+3V3); the Fly-Buck buck converter driver and transformer, forming a Fly-Buck buck converter, receive the EN signal from the MCU and control the current in the primary winding of the transformer, thereby... The required voltage is generated in the secondary winding of the transformer to power the controllable power supply (such as ISO_12V, ISO_5V, VCC3.3V, VCC_12V). In the system sleep state, the MCU module can send a command to the EN port of the Fly-Buck buck converter driver to turn off the controllable power supply to reduce power consumption. When the battery pack is fully charged and has been idle for a long time, the MCU module enables the self-discharge circuit module through the MCU_self_discharge_en signal to gradually release the charge in the battery and increase safety. EEPROM and FLASH Memory (i.e., storage modules) are used to store data in the system (such as log records, key parameter storage, fault information records, firmware program storage, etc.).

[0064] In this embodiment of the utility model, when the UAV is in standby mode, the wake-up circuit of the MCU module 30 (powered by the VCC_3V3_STBY power supply) receives the CAN signal isolated by the digital isolation module 130, which will trigger the MCU module 30 to wake up from the standby mode and resume its normal operation. If the CAN signal wake-up fails, the MCU module can also be woken up by the button module.

[0065] In this embodiment of the utility model, the charging and discharging module 40 of the low-voltage battery management system 1 adopts a top heat dissipation packaging method to encapsulate the MOSFET, which can improve heat dissipation capacity. At the same time, the low-voltage battery management system 1 also includes a self-discharge module 50 to reduce power consumption, improve the safety of the battery when it is idle for a long time, and improve the battery life, thereby improving the system stability. The low-voltage battery management system 1 also has a Bluetooth module 60, which allows users to conveniently check the battery status and abnormalities through electronic devices.

[0066] The sequence numbers of the above embodiments of the present invention are for descriptive purposes only and do not represent the superiority or inferiority of the embodiments.

[0067] The embodiments or examples disclosed herein are not exhaustive, but merely illustrative of some embodiments or examples, and are not intended to limit the scope of protection of this disclosure. Unless otherwise specified, each step in a particular embodiment or example can be implemented as an independent embodiment, and the steps can be arbitrarily combined. For example, a solution after removing some steps in a particular embodiment or example can also be implemented as an independent embodiment, and the order of the steps in a particular embodiment or example can be arbitrarily interchanged. Furthermore, optional methods or examples in a particular embodiment or example can be arbitrarily combined; moreover, embodiments or examples can be arbitrarily combined. For example, some or all steps of different embodiments or examples can be arbitrarily combined, and a particular embodiment or example can be arbitrarily combined with optional methods or examples of other embodiments or examples.

[0068] In the above embodiments of this utility model, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0069] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A low-voltage battery management system, characterized in that, The low-voltage battery management system (1) includes: A battery pack (10) is connected to an analog front-end module (20), wherein the battery pack (10) includes: a plurality of battery cells (101); The analog front-end module (20) is used to monitor the data information of each of the battery cells (101); MCU module (30), which is connected to charge / discharge module (40) and is used to process the data information; The charging and discharging module (40) is used to control the battery pack (10) to adjust the charging strategy or the discharging strategy. The self-discharge module (50) is connected to the battery pack (10) and the battery pack (10) respectively. An MCU module (30) is connected to automatically discharge the battery pack (10).

2. The low-voltage battery management system according to claim 1, characterized in that, The charging and discharging module (40) also includes: Multiple MOS transistors (401), wherein all of the MOS transistors (401) constitute a MOS transistor array, and the MOS transistor array adopts a top heat dissipation package.

3. The low-voltage battery management system according to claim 1, characterized in that, The low-voltage battery management system (1) also includes: Bluetooth module (60), the Bluetooth module (60) is used to send the data information processed by the MCU module (30) to the Bluetooth receiving device; The signal processing module (70) is connected to the battery pack (10) and the analog front-end module (20) respectively. The signal processing module (70) is used to preprocess the signal data of the collected battery cell (101).

4. The low-voltage battery management system according to claim 2, characterized in that, The low-voltage battery management system (1) also includes: A pre-charge circuit module (80) is connected to a pre-discharge circuit module (90) and an MCU module (30) respectively, and is used to control the charging process of the battery pack (10) from a dormant state to an active state. The pre-discharge circuit module (90) is used to control the discharge process of the battery pack (10); The pre-charge circuit module (80) further includes a first MOS transistor (801), and the pre-discharge circuit module (90) further includes a second MOS transistor (901), wherein the drain of the first MOS transistor (801) is connected to the drain of the second MOS transistor (901).

5. The low-voltage battery management system according to claim 4, characterized in that, The low-voltage battery management system (1) also includes: A MOSFET driving module (100) is provided to drive all the MOSFETs (401). The MOSFET driving module (100) further includes a first MOSFET driver (100a) and a second MOSFET driver (100b). The first MOSFET driver (100a) is connected to the gate of the first MOSFET (801), and the second MOSFET driver (100b) is connected to the gate of the second MOSFET (901). The first MOSFET driver (100a) and the second MOSFET driver (100b) are respectively connected to the gate of the MOSFET (801). The gates of multiple MOS transistors (401) in the MOS transistor array are connected, and each MOS transistor (401) is connected to each other by a line.

6. The low-voltage battery management system according to claim 1, characterized in that, The low-voltage battery management system (1) also includes: A CAN transceiver (110) is connected to a connector (120) and is used to receive data transmitted by the connector (120) and the digital isolation module (130). The connector (120) is connected to an external device and is used to receive external data and data sent by the CAN transceiver (110); The digital isolation module (130) is connected to the CAN transceiver (110) and the MCU module (30) respectively, and is used to isolate the MCU module (30) from the CAN transceiver (110).

7. The low-voltage battery management system according to claim 6, characterized in that, The low-voltage battery management system (1) also includes: Multiple isolation optocouplers (140) are connected to the MCU module (30) and the connector (120) respectively, for isolating the MCU module (30) from the connector (120).

8. The low-voltage battery management system according to claim 1, characterized in that, The low-voltage battery management system (1) also includes: Multiple storage modules (150) are provided for storing data generated by the low-voltage battery management system (1). A button module (160) is connected to the MCU module (30); Total voltage detection module (170), which is connected to the battery pack (10), is used to detect the total voltage of the battery pack (10).

9. The low-voltage battery management system according to claim 1, characterized in that, The low-voltage battery management system (1) also includes: A step-down circuit (180), which is connected to a voltage regulator (190), is used to convert the input voltage of the low-voltage battery management system (1) into a low voltage. Multiple voltage regulators (190) are used to adjust the low voltage to supply power to different power sources.

10. The low-voltage battery management system according to claim 9, characterized in that, The low-voltage battery management system (1) also includes: Fly-Buck buck converter (200) for converting the input voltage to a target voltage.

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