Low-voltage boosting battery management control system

Abstract

The utility model discloses a low-voltage boost battery management control system, which is connected with a DC / DC module, monitors the state of a battery system, protects and controls the charging management of the battery system, and comprises a main control chip MCU, a battery monitoring module, a charging and discharging protection module and a power supply circuit, the main control chip MCU is connected with the DC / DC module, obtains the real-time voltage value and current value of the battery side, the real-time voltage value and current value of the high-voltage side and the internal temperature value of the DC / DC module, and controls the operation of the DC / DC module. The battery monitoring module collects a battery side real-time monomer voltage monitoring value, a total current monitoring value and a total voltage monitoring value, a high-voltage side real-time voltage monitoring value and a current monitoring value, and an internal temperature monitoring value of the DC / DC module, and transmits the collected information to the main control chip MCU; the main control chip MCU is adapted to the operation of the inverter through the charging and discharging protection module, and the inverter and the battery system are electrically connected and disconnected.

Description

Technical Field

[0001] The utility model relates to a low-voltage boost battery management and control system. Background Art

[0002] In traditional household energy storage battery systems, they are mainly divided into high-voltage and low-voltage household energy storage systems, which are respectively equipped with high-voltage / low-voltage battery management systems for household energy storage system application scenarios. The following is a comparison of the characteristics of high-voltage and low-voltage household energy storage systems.

[0003] 1. Characteristics of high-voltage household energy storage system:

[0004] Safety: High voltage systems typically have more advanced safety features and protections, and can provide a more stable power supply.

[0005] System efficiency: The high-voltage system has a simpler circuit topology, which reduces size and weight, reduces failure rate, and improves system efficiency.

[0006] Cost: Although the cost of high-voltage batteries is relatively high, the overall cost may be more advantageous due to their high efficiency and low requirements for electronic components.

[0007] Application scenarios: The main markets for high-voltage systems are developed countries and regions such as Europe, Japan, and Australia, and are suitable for scenarios with high requirements for safety and efficiency.

[0008] 2. Low-voltage household energy storage system

[0009] Safety: Low-voltage systems may not be as safe as high-voltage systems in some cases, but for most home users, they are more than safe enough.

[0010] System efficiency: Low-voltage systems may be slightly less efficient than high-voltage systems, but for small home storage the difference is usually not significant.

[0011] Cost: Low-voltage systems are generally less expensive and are more popular, especially in price-sensitive regions such as Latin America, Africa, and Southeast Asia.

[0012] Application scenarios: Low-voltage systems are suitable for a wide range of home users, especially in cost-sensitive markets such as the US market where Tesla home energy storage dominates.

[0013] In order to meet the compatibility of high and low voltage, the battery system combines the cost advantages of the low-voltage battery system while taking into account the high safety and high system efficiency of the high-voltage battery system to carry out technical innovation of low-voltage boosting to high-voltage. Therefore, a low-voltage boost battery management and control system is needed with a highly integrated design that is compatible with battery management and DC / DC boost conversion, intelligent charge and discharge management, multiple safety protections, precise status monitoring, active current sharing control, intelligent APP cloud platform ecological support, modularity and scalability, and other advantages and characteristics. Breakthrough innovations are applied to household energy storage battery systems. Utility Model Content

[0014] The purpose of the utility model is to provide a low voltage boost battery management and control system to solve the technical problems mentioned in the above background technology.

[0015] The technical solution to achieve the purpose of the utility model is: a low-voltage boost battery management and control system, the control system is connected to the DC / DC module, controls the low-voltage boost of the battery system, monitors the real-time status of the battery system and performs protection actions, and controls the charging management of the battery system, characterized in that it includes a main control chip MCU, a battery monitoring module, a charge and discharge protection module and a power supply circuit;

[0016] The power supply circuit provides power to the entire system;

[0017] The main control chip MCU is connected to the DC / DC module for communication, obtains the real-time voltage and current values ​​of the battery side, the real-time voltage and current values ​​of the high-voltage side, and the internal temperature value of the DC / DC module, and controls the operation of the DC / DC module;

[0018] The battery monitoring module collects the real-time single cell voltage monitoring value, the total current monitoring value and the total voltage monitoring value on the battery side, the real-time voltage monitoring value and current monitoring value on the high-voltage side, and the internal temperature monitoring value of the DC / DC module, and transmits the collected monitoring information to the main control chip MCU;

[0019] The main control chip MCU adapts the operation of the inverter and the electrical connection and disconnection between the inverter and the battery system through the charge and discharge protection module.

[0020] Furthermore, the battery monitoring module includes a single cell voltage monitoring circuit, a single cell balancing control circuit, a single cell temperature monitoring circuit, a temperature monitoring circuit, a total voltage monitoring circuit, a battery side total current monitoring circuit and a high-voltage side total current monitoring circuit, and each circuit is electrically connected to the main control chip MCU.

[0021] Furthermore, the charging and discharging protection module includes an interactive communication circuit with the DC / DC module, a communication circuit with the inverter PCS, and a high-voltage side protection cut-off DO circuit;

[0022] The main control chip MCU communicates with the DC / DC module through an interactive communication circuit with the DC / DC module, and stops the charging and discharging action by controlling the standby / shutdown of the DC / DC module;

[0023] The main control chip MCU is connected to the inverter through the inverter PCS communication circuit and adapts to the operation of the inverter;

[0024] The main control chip MCU controls the electrical connection and disconnection between the inverter and the battery system by cutting off the DO circuit through the high-voltage side protection.

[0025] Furthermore, it also includes a parallel DI&DO addressing circuit and a parallel communication circuit, and the parallel DI&DO addressing circuit and the parallel communication circuit are both electrically connected to the main control chip MCU. The control system parallelizes the entire system by communicating with the inverter PCS circuit, the parallel DI&DO addressing circuit and the parallel communication circuit.

[0026] Furthermore, it also includes a key circuit and an LED display circuit, which are both electrically connected to the main control chip MCU. The control system uses the key circuit to realize the cascade power on and off operations of the parallel system one by one, and displays the battery capacity / status information of the master / slave system through an external display screen connected to the LED display circuit for human-computer interaction indication.

[0027] Furthermore, it also includes a fire action DI monitoring and a DO control circuit. The main control chip MCU obtains the fire action signal in real time through the fire DI monitoring circuit, and drives the DO control circuit to perform overall system protection action.

[0028] Furthermore, it also includes a wireless 4G / WIFI circuit, and the main control chip MCU is connected to the cloud server through the wireless 4G / WIFI circuit.

[0029] By adopting the above technical solution, the utility model has the following beneficial effects:

[0030] 1. The low-voltage boost battery management and control system of the utility model has a highly integrated design. The system integrates multiple functions such as charging management, status monitoring, low-voltage boost control, safety protection and data communication. The high integration simplifies the structural design of the system integrated battery.

[0031] 2. The low-voltage boost battery management and control system of the utility model has an intelligent charging management function. By controlling the DC / DC module, it supports multiple charging modes, including constant current charging, constant voltage charging and trickle charging, to adapt to different charging needs and extend battery life.

[0032] 3. The low-voltage boost battery management and control system of the utility model has multiple safety redundant design protection functions, including multi-channel temperature measurement for over-temperature, over-current on the charging and discharging battery side and high-voltage side, short circuit, single cell voltage and total voltage monitoring for over-charging and over-discharging, etc., to ensure the safe operation of the battery under various working conditions.

[0033] 4. The low-voltage boost battery management and control system of the utility model has an active current balancing control function, supports the mixed use of new and old batteries, realizes balanced charging of the battery pack through active current balancing technology, improves the overall performance and efficiency of the system, significantly reduces the initial investment cost, and saves daily operation and maintenance costs through the intelligent battery management system.

[0034] 5. The low-voltage boost battery management and control system of the utility model has flexible scalability for parallel operation. It is designed to communicate and address multiple low-voltage boost battery management systems in parallel. The master and slave machines of the multi-battery management and control systems work together to support in-situ replacement and capacity upgrade, and adapt to different application scenarios and energy requirements.

[0035] 6. The low-voltage boost battery management and control system of the utility model has the function of remote monitoring and control through wireless 4G / WIFI interaction with the cloud platform. The smart APP or WEB supports OTA upgrades and local operation authority management to improve operation and maintenance efficiency.

[0036] 7. The low-voltage boost battery management and control system of the utility model has high safety. It is linked to the PACK-level fire extinguishing device through circuit drive control and is equipped with a PACK-level fire extinguishing device. It can quickly extinguish fires when abnormalities occur in the battery to prevent the spread of accidents.

[0037] 8. The utility model adopts a standardized integrated design of a low-voltage boost battery management system, which is compatible with battery management and bidirectional boost intelligent charging and discharging. It adopts a flexible "building blocks" method to combine and match through parallel operation to meet the battery pack needs of household energy storage scenarios. It combines the Internet of Things and Internet technology in engineering applications to carry out standardized / engineered replication and application, and simplified flexible and dynamic expansion. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to make the content of the utility model easier to understand, the utility model is further described in detail according to specific embodiments and in conjunction with the accompanying drawings.

[0039] Figure 1 The utility model is a schematic diagram of the internal modules of a low-voltage boost battery management and control system.

[0040] Figure 2 This is a parallel system diagram of a low-voltage boost battery management and control system of the utility model.

[0041] Figure 3The utility model discloses a single cell temperature monitoring circuit of a low voltage boost battery management and control system embodiment.

[0042] Figure 4 The utility model discloses a high-voltage side total current monitoring circuit of a low-voltage boost battery management and control system embodiment.

[0043] Figure 5 The utility model discloses a total voltage monitoring circuit of a low voltage boost battery management control system embodiment.

[0044] Figure 6 The utility model discloses a communication circuit with an inverter PCS according to an embodiment of a low-voltage boost battery management and control system.

[0045] Figure 7 The utility model discloses a parallel communication circuit of a low-voltage boost battery management and control system embodiment.

[0046] Figure 8 The utility model discloses a circuit for interactive communication with a DC / DC module in a low-voltage boost battery management and control system embodiment.

[0047] The numbers in the attached drawings are: 1. Main control chip MCU; 2. Single cell voltage monitoring circuit; 3. Single cell balancing control circuit; 4. Single cell temperature monitoring circuit; 5. Temperature monitoring circuit; 6. Total voltage monitoring circuit; 7. Battery side total current monitoring circuit; 8. High voltage side total current monitoring circuit; 9. Wireless 4G / WIFI circuit; 10. Communication circuit with inverter PCS; 11. Communication circuit with host computer; 12. Power supply circuit; 13. Key circuit; 14. LED display circuit; 15. Parallel DI&DO addressing circuit; 16. Parallel communication circuit; 17. Interactive communication circuit with DC / DC module; 18. Real-time clock RTC circuit; 19. Storage circuit; 20. High voltage side protection cut-off DO circuit; 21. Fire action DI monitoring and drive DO control circuit. DETAILED DESCRIPTION

[0048] In order to better understand the above technical solution, the above technical solution will be described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0049] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0050] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0051] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0052] In the description of the embodiments of the present utility model, it should be understood that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, or are the orientations or positional relationships in which the utility model product is conventionally placed when in use, or are the orientations or positional relationships conventionally understood by those skilled in the art. They are only for the convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present utility model.

[0053] In the description of the embodiments of the present utility model, it is also necessary to explain that, unless otherwise clearly stipulated and limited, the terms "set", "installed", "connected", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances. The utility model is further described below in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the utility model, and cannot be used to limit the scope of protection of the utility model.

[0054] (Example 1)

[0055] See Figure 1, a low voltage boost battery management and control system, including: a main control chip MCU1, a battery monitoring module, a charge and discharge protection module, a wireless 4G / WIFI circuit 9, a communication circuit with a host computer 11, a power supply circuit 12, a button circuit 13, an LED display circuit 14, a parallel DI&DO addressing circuit 15, a parallel communication circuit 16, a real-time clock RTC circuit 18, a storage circuit 19, and a fire action DI monitoring and driving DO control circuit 21, wherein the battery monitoring module includes a single cell voltage monitoring circuit 2, a single cell balancing control circuit 3, a single cell temperature monitoring circuit 4, a temperature monitoring circuit 5, a total voltage monitoring circuit 6, a battery side total current monitoring circuit 7 and a high voltage side total current monitoring circuit 8, and each circuit of the battery monitoring module is electrically connected to the main control chip MCU1. The charge and discharge protection module includes an interactive communication circuit with a DC / DC module 17, a communication circuit with an inverter PCS 10 and a high voltage side protection cut-off DO circuit 20.

[0056] The power supply circuit 12 supplies power to the entire system.

[0057] In this embodiment, the total voltage monitoring has a redundant protection design. The main control chip MCU1 can obtain each single cell voltage monitoring value through the single cell voltage monitoring circuit 2 and accumulate it to obtain the total voltage on the battery side. At the same time, the main control chip MCU1 directly obtains the total voltage on the battery side through the total voltage monitoring circuit 6. The two voltage values ​​are redundantly judged. If they are within the error range, it is considered that the total voltage acquisition function is normal. If the error exceeds the valid range or the single cell voltage monitoring circuit 2 collects abnormalities or the total voltage monitoring circuit 6 collects abnormalities, the main control chip MCU1 redundantly determines that the system has failed and takes protective action.

[0058] In this embodiment, the total current monitoring on the battery side and the total current monitoring on the high-voltage side have redundant protection design. The main control chip MCU1 can obtain the total current monitoring value on the battery side and the total current monitoring value on the high-voltage side through the total current monitoring circuit 7 on the battery side and the total current monitoring value on the high-voltage side 8 respectively. At the same time, the main control chip MCU1 communicates with the DC / DC module interactive communication circuit 17 and the DC / DC module to obtain the total current value on the battery side and the total current value on the high-voltage side. The main control chip MCU1 makes redundant judgments on the two groups of current values ​​respectively. If they are within the error range, it is considered that the current acquisition function is normal. If the error exceeds the effective range or the total current monitoring circuit 7 on the battery side collects abnormalities or the total current monitoring circuit 8 on the high-voltage side collects abnormalities, the main control chip MCU1 makes redundant judgments and considers that the system fails and takes protective actions.

[0059] The overall temperature control system of this embodiment has a redundant protection design. The main control chip MCU1 can connect the temperature sensor through the single cell temperature monitoring circuit 4 and the temperature monitoring circuit 5. The sensors are arranged in the battery pack at the single cell position, pole position, DC / DC temperature measurement point, ambient temperature measurement point and other positions to obtain real-time temperature information of these positions. At the same time, the internal temperature value of the DC / DC is obtained in combination with communication with the DC / DC module for redundant protection judgment. If it is within the error range, it is considered that the temperature measurement function of the overall system is normal. If the error exceeds the effective range or the single cell temperature monitoring circuit 4 collects abnormal data or the temperature monitoring circuit 5 collects abnormal data, the main control chip MCU1 redundantly determines that the system has failed and performs protection action.

[0060] The control system has multiple protection circuit functions: the first level protection function is realized by: the control system communicates and interacts with the inverter through the inverter PCS communication circuit 10. When the main control chip MCU1 obtains that the battery management system is in a protection state, the main control chip MCU1 transmits a communication message to the inverter through this circuit, informing the inverter to shut down to stop the charging and discharging action.

[0061] The second level protection function is realized as follows: the control system communicates and interacts with the DC / DC module through the DC / DC module interactive communication circuit 17. When the main control chip MCU1 obtains that the system is in a protection state, it notifies the DC / DC module to standby / shutdown through the interactive communication circuit to stop charging and discharging.

[0062] The third level protection is realized as follows: the high-voltage side protection cut-off DO circuit 20 of the control system is connected to the shunt release electrical component, and the shunt release is connected to the P+ / P- end which converges with the inverter power line output end and the battery system. When the main control chip MCU1 obtains that the battery management system is in the protection state, the main control chip MCU1 drives the high-voltage side protection cut-off DO circuit 20 to actuate the shunt release to disconnect the charging and discharging circuit between the inverter and the battery system to realize the protection action.

[0063] The system of this embodiment can access the fire sensor action signal through the DI monitoring circuit to obtain the fire action signal in real time, and can also drive the protection circuit to perform overall system protection action by driving the DO control circuit.

[0064] The control system supports intelligent parallel expansion of multiple control systems. The main control chip MCU1 of the control system performs intelligent coding addressing through the parallel DI&DO addressing circuit 15, the parallel communication circuit 16 and the inverter PCS communication circuit 10. When the main control chip MCU1 detects that the inverter interaction message is obtained through the inverter PCS communication circuit, the control system is the host system. After the host system confirms, it addresses the sub-control systems one by one through the host system main control chip MCU1, the parallel DI&DO addressing circuit 15 and the parallel communication circuit 16, and replies whether the coding is successful or not through the master-slave communication, thereby realizing the intelligent parallel expansion function of the overall system.

[0065] During the multi-system parallel expansion process, the control system can realize the cascade power on and off operation of the parallel system one by one through the key circuit 13 and display the battery capacity / status information of the master / slave system on the external display screen through the LED display circuit 14 for human-computer interaction.

[0066] The control system has a wireless 4G / WIFI circuit 9, and the main control chip MCU1 is wirelessly connected to the cloud server through the wireless 4G / WIFI circuit 9, and performs data communication interaction with the cloud server through a communication protocol.

[0067] The control system communicates with the host computer through the host computer communication circuit 11 and provides reliable and accurate time information through the real-time clock RTC circuit 18.

[0068] The control system has a storage circuit 19. In this embodiment, a 128Kbit EEPROM is used to store information such as alarms, fault events, and parameter settings during the charging and discharging process of the entire system.

[0069] In this embodiment, the integrated battery pack PACK uses 8 Ruipu Lanjun LiFePO4-280AH using 1P8S to form a battery PACK battery pack. The temperature sampling adopts one temperature sampling point design for each battery cell. The rated voltage is 25.6V and the rated capacity is 7.168kWh. The low-voltage single battery pack is composed of each PACK battery pack. Each PACK battery pack is matched one by one with the low-voltage boost battery management control system and the DC / DC module. Multiple battery packs can be connected in parallel to form a parallel system.

[0070] In this embodiment, the DC / DC module realizes bidirectional energy conversion from DC20V to DC400V, cooperates with the battery management system BMS to coordinate charging and discharging control of the battery module, and has functions such as over-temperature, short circuit, over-voltage and under-voltage, over-current, and soft start. The DC / DC module has a high-voltage side rated voltage of DC400V, a high-voltage side voltage range of DC250V-600V, a low-voltage side rated voltage of DC22.2V, a low-voltage side voltage range of DC17V-DC30V, a low-voltage side current range of -150A~150A, a peak efficiency of ≥96%, a rated power of 3.5kW, and a variety of high / low voltage constant voltage and constant current working modes, and uses RS232 communication interaction with the battery management system BMS. The main control MCU1 communicates and interacts with the DC / DC module through the DC / DC module interactive communication circuit 17. The main control MCU1 can obtain the real-time voltage and current values ​​of the battery side, the real-time voltage and current values ​​of the high-voltage side, and the internal temperature value of the DC / DC by communicating with the DC / DC module. At the same time, it can control the DC / DC module to shut down / start up, and control the switching operation of the working mode (standby mode, automatic operation mode, forced charging mode, forced discharge mode) of the DC / DC module.

[0071] In this embodiment, the single cell voltage monitoring circuit 2 and the single cell balancing control circuit 3 both use the Zhongying AFE chip SH367309 as the digital front-end chip circuit design scheme for the overall low-voltage boost battery management and control system. Zhongying SH367309 is a digital front-end chip designed for lithium battery BMS (Battery Management System) and is suitable for lithium battery PACKs with a total voltage not exceeding 70V. The chip can independently protect the lithium battery PACK in protection mode and provide a variety of protection functions, such as overcharge protection, over-discharge protection, temperature protection, charge and discharge overcurrent protection, short circuit protection, etc. In addition, SH367309 also integrates a balancing switch to improve the consistency of the battery cell. The SH367309 chip has multiple working modes, including acquisition mode, protection mode, warehouse mode and burning mode. In acquisition mode, it can cooperate with MCU (Microcontroller Unit) to manage the lithium battery PACK and enable all protection functions. In protection mode, SH367309 can run independently and execute built-in protection strategies.

[0072] In this embodiment, the single temperature monitoring circuit 4 and the temperature monitoring circuit 5 adopt Figure 3The NTC temperature monitoring circuit shown in the embodiment has 10 NTC temperature measurement channels. The single-cell temperature monitoring circuit 4 includes 8 channels for collecting the temperatures of the 8 battery cells in the embodiment, 1 channel for collecting ambient temperature in the temperature monitoring circuit 5, and 1 channel for collecting DC / DC temperature points. The NTC accuracy specification used in this circuit is ±1°C. NTC is used as a thermistor. When the temperature of the NTC thermistor changes, its resistance changes, resulting in a voltage change in the voltage divider circuit. This changing voltage is sent to the AD conversion interface of the main control chip MCU1. The AD converter of the main control chip MCU1 converts the analog voltage signal into a digital signal, which is then read and processed by the main control chip MCU1. In this embodiment, the NTC temperature measurement AD circuit can provide accurate and reliable temperature monitoring for the BMS to ensure the safe operation of the battery pack system.

[0073] In this embodiment, Figure 4 The figure shows a high-voltage side total current monitoring circuit 8 of an embodiment of a low-voltage boost battery management and control system. This embodiment adopts the high-performance current detection amplifier chip TP181A1 current monitoring solution launched by 3PEAK. The shunt is a low-resistance resistor that is connected in series in the circuit to detect the current flowing through the circuit. When current passes through the shunt, a voltage drop proportional to the current is generated at both ends of it. This voltage drop is usually very small and needs to be amplified by a current detection amplifier for measurement. TP181A1 is a zero-drift, bidirectional current sensing amplifier that can operate at a common mode voltage of -0.3V to 36V to detect the voltage drop across the shunt. In the current sampling circuit, the shunt is connected to the TP181A1 amplifier. The voltage drop across the shunt is collected by the input of the amplifier. Since TP181A1 has rail-to-rail output and the output voltage range is close to the power supply voltage, the circuit VOUT is connected to the AD conversion interface of the main control chip MCU1. The main control chip MCU1 converts the analog voltage signal into a digital signal through the AD converter. The digital signal is then read and processed by the main control chip MCU1 and converted into a current sampling value.

[0074] In this embodiment, Figure 5 The total voltage monitoring circuit 6 of the embodiment is shown. The circuit U-VBAT+ is connected to the AD conversion interface of the main control chip MCU1. The main control chip MCU1 converts the total voltage of the battery pack into a sampled value through AD conversion and a reference value.

[0075] In this embodiment, Figure 6The figure shows a communication circuit 10 with the inverter PCS of an embodiment of a low-voltage boost battery management and control system. In this embodiment, the communication with the inverter PCS adopts an isolated CAN transceiver TDA51SCANHC produced by Mornsun Technology Co., Ltd. (MORNSUN) for circuit design. The CAN transceiver has high isolation voltage resistance, electrostatic protection capability, high-speed communication capability and multiple built-in protection functions, making it a key component in the CAN communication network of the battery management system, ensuring communication interaction with the inverter.

[0076] In this embodiment, Figure 7 This is a parallel communication circuit 16 of a low-voltage boost battery management and control system embodiment of the utility model. In this embodiment, the parallel RS485 circuit transceiver adopts a half-duplex RS-485 transceiver BL3085B produced by Shanghai Belling Co., Ltd. It has ±18kV IEC 61000-4-2 contact discharge protection capability and a built-in failure protection circuit. This BL3085B high-performance RS-485 transceiver provides high reliability and anti-interference capabilities through a built-in failure protection circuit and a slew rate limited driver design. This transceiver is suitable for various industrial communication environments that require high-speed, error-free data transmission, and its high input impedance and anti-static capabilities further enhance its applicability in complex applications, ensuring the parallel communication requirements in the low-voltage boost battery management and control system.

[0077] In this embodiment, Figure 8 This is a low-voltage boost battery management and control system embodiment of the utility model, which is an interactive communication circuit 17 with a DC / DC module. The RS232 interface chip used is a low-power multi-channel RS-232 line driver / receiver SP3232EEN produced by UMW (Universal Taiwan Semiconductor), which is suitable for single power supply of 3.0V to 5.5V. The chip integrates two drivers and two receivers, and is equipped with a dual charge pump circuit, which can provide a high-speed RS-232 communication interface under low power consumption conditions. SP3232EEN is a high-performance, low-power RS-232 interface chip, which is suitable for communication and interaction with DC / DC modules in this embodiment. Its wide power supply voltage range, high-speed data transmission capability and enhanced ESD protection make it an ideal circuit choice for communication and interaction between low-voltage boost battery management and control systems and DC / DC modules.

[0078] The low-voltage boost battery management and control system of the utility model has a highly integrated design. The system integrates multiple functions such as charging management, status monitoring, low-voltage boost control, safety protection and data communication. The high integration simplifies the structural design of the system integrated battery.

[0079] This embodiment provides a low voltage boost battery management and control system, through the circuit interface and Figure 2 The system diagram shown in the figure constructs a low-voltage boost battery pack application scenario. Compared with the traditional high and low voltage battery management system, the low-voltage boost battery management and control system has the following advantages:

[0080] 1. Improved security

[0081] The low-voltage boost battery management and control system has more advanced safety features, such as over-temperature protection, over-current protection, short-circuit protection and over-voltage protection, which can take timely measures to prevent accidents when the battery is abnormal. Under the trend of high-voltage system, more accurate battery pack current measurement and control can be achieved.

[0082] 2. Efficiency and performance optimization

[0083] The low-voltage boost battery management and control system can more accurately estimate the battery capacity and battery operating status, improving the battery's efficiency and overall performance. At the same time, combined with the DC / DC module, it can also support the mixed use of new and old batteries through active current sharing control technology, significantly reducing the initial investment cost, and saving daily operation and maintenance costs through the intelligent battery management system.

[0084] 3. Innovation of system architecture

[0085] The low voltage boost battery management and control system adopts a modular integrated design, and the reserved parallel interface makes the system application more flexible and easy to expand and maintain.

[0086] 4. Improvements in thermal management

[0087] The low voltage boost battery management control system can more effectively monitor and regulate the battery temperature, ensure that the battery operates in the best working condition, and extend the battery life.

[0088] 5. Integrated fire safety and fire protection

[0089] The low voltage boost battery management and control system can achieve accurate and rapid detection and drive extinguishing of fires, preventing them from spreading, and further improving the fire safety of the system.

[0090] 6. Enhanced user experience

[0091] The low-voltage boost battery management and control system is equipped with a wireless 4G / WIFI circuit 9 to communicate and interact with the cloud platform. Users can achieve remote monitoring and control through APP / WEB and the cloud platform, support OTA upgrades and local operation authority management, and realize centralized management of energy storage assets through the needs of the cloud BMS, providing users with more convenience and information support.

[0092] In summary, the low-voltage boost battery management and control system has significant advantages over conventional high and low voltage battery management systems in terms of safety, efficiency, system architecture, thermal management, user experience, etc. These advantages make the low-voltage boost battery management and control system intelligent lithium battery BMS the development trend of future household energy storage systems.

[0093] The specific embodiments described above further illustrate the purpose, technical solutions and beneficial effects of the present invention. It should be understood that the above description is only a specific embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A low voltage boost battery management and control system, the control system is connected to a DC / DC module, controls the low voltage boost of the battery system, monitors the real-time status of the battery system and performs protection actions, and controls the charging management of the battery system, characterized in that: Including main control chip MCU, battery monitoring module, charge and discharge protection module and power supply circuit; The power supply circuit provides power to the entire system; The main control chip MCU is connected to the DC / DC module for communication, obtains the real-time voltage and current values ​​of the battery side, the real-time voltage and current values ​​of the high-voltage side, and the internal temperature value of the DC / DC module, and controls the operation of the DC / DC module; The battery monitoring module collects the real-time single cell voltage monitoring value, the total current monitoring value and the total voltage monitoring value on the battery side, the real-time voltage monitoring value and current monitoring value on the high-voltage side, and the internal temperature monitoring value of the DC / DC module, and transmits the collected monitoring information to the main control chip MCU; The main control chip MCU adapts the operation of the inverter and the electrical connection and disconnection between the inverter and the battery system through the charge and discharge protection module.

2. A low voltage boost battery management and control system according to claim 1, characterized in that: The battery monitoring module includes a single cell voltage monitoring circuit, a single cell balancing control circuit, a single cell temperature monitoring circuit, a temperature monitoring circuit, a total voltage monitoring circuit, a battery side total current monitoring circuit and a high-voltage side total current monitoring circuit, and each circuit is electrically connected to the main control chip MCU.

3. A low voltage boost battery management and control system according to claim 1, characterized in that: The charging and discharging protection module includes an interactive communication circuit with a DC / DC module, a communication circuit with an inverter PCS, and a high-voltage side protection cut-off DO circuit; The main control chip MCU communicates with the DC / DC module through an interactive communication circuit with the DC / DC module, and stops the charging and discharging action by controlling the standby / shutdown of the DC / DC module; The main control chip MCU is connected to the inverter through the inverter PCS communication circuit and adapts to the operation of the inverter; The main control chip MCU controls the electrical connection and disconnection between the inverter and the battery system by cutting off the DO circuit through the high-voltage side protection.

4. A low voltage boost battery management and control system according to claim 3, characterized in that: It also includes a parallel DI&DO addressing circuit and a parallel communication circuit. The parallel DI&DO addressing circuit and the parallel communication circuit are both electrically connected to the main control chip MCU. The control system performs overall system parallelization through the inverter PCS communication circuit, the parallel DI&DO addressing circuit and the parallel communication circuit.

5. A low voltage boost battery management and control system according to claim 4, characterized in that: It also includes a key circuit and an LED display circuit, both of which are electrically connected to the main control chip MCU. The control system uses the key circuit to realize the cascade power on and off operations of the parallel system one by one, and displays the battery capacity / status information of the master / slave system on an external display screen through the LED display circuit for human-computer interaction indication.

6. A low voltage boost battery management and control system according to claim 1, characterized in that: It also includes a fire action DI monitoring and a DO control circuit. The main control chip MCU obtains the fire action signal in real time through the fire DI monitoring circuit, and drives the DO control circuit to perform overall system protection action.

7. A low voltage boost battery management and control system according to claim 1, characterized in that: It also includes a wireless 4G / WIFI circuit, and the main control chip MCU is connected to the cloud server through the wireless 4G / WIFI circuit.

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