BMS (battery management system)

Abstract

The utility model relates to the technical field related to circuits, in particular to a battery BMS management system. The battery BMS management system comprises a relay which is arranged on a charging and discharging circuit of a preset battery pack and is used for controlling the on-off of the charging and discharging circuit; the battery information acquisition module is used for acquiring battery information; and the relay control circuit is respectively connected with the battery information acquisition module and the relay and is used for acquiring the battery information and controlling the state of the relay based on the battery information so as to control the on-off of the charging and discharging circuit. According to the arrangement, the relay is used as a control element, so that the system can provide high-reliability large-current control. And the mechanical structure of the relay enables the relay to be more stable in a high-current environment, so that the safety of the charging and discharging process of the battery is ensured.

Description

Technical Field

[0001] The present application relates to the technical field of circuits, and in particular to a battery BMS management system. Background Art

[0002] In the prior art, the control of battery charging and discharging is usually performed by semiconductor devices such as transistors, MOSFETs, etc. These devices are widely used in battery BMS management systems due to their advantages such as fast switching speed, small size, and easy integration. However, when these semiconductor devices are in a high current working environment, they may encounter a series of problems that affect their performance and reliability.

[0003] First, large currents may cause overheating of semiconductor devices. When current passes through a device, heat is generated due to the presence of resistance. The greater the current, the more heat is generated. If the semiconductor device cannot dissipate heat effectively, its internal temperature may rise to a level that affects performance or even damages the device. Overheating not only reduces the efficiency of the device, but may also cause changes in device parameters, thereby affecting the stability and accuracy of battery charging and discharging.

[0004] Secondly, under high current conditions, semiconductor devices may be subject to electromagnetic interference (EMI). Electromagnetic interference may cause device malfunctions, such as accidental switching on or off, which may cause interruptions or instability in the battery charging and discharging process, and may even cause safety accidents. In addition, high currents may also produce large voltage drops in the circuit, affecting the voltage monitoring and control accuracy of the battery BMS management system.

[0005] Furthermore, under extreme working conditions, such as high temperature, high humidity or chemically corrosive environments, the reliability of semiconductor devices will further decline. These conditions may accelerate the aging process of the device, reduce its service life, or even cause the device to fail. Once the protection device fails, the battery may face overcharge, over-discharge or other forms of damage, which will not only shorten the battery life, but also cause serious safety accidents such as fire or explosion. Summary of the invention

[0006] In view of this, the embodiments of the present application are directed to providing a battery BMS management system.

[0007] The present application provides a battery BMS management system, including:

[0008] A relay, arranged on a charge and discharge circuit of a preset battery pack, for controlling the on and off of the charge and discharge circuit;

[0009] A battery information collection module is used to collect battery information;

[0010] The relay control circuit is connected to the battery information acquisition module and the relay respectively, and is used to obtain the battery information and control the state of the relay based on the battery information to control the on and off of the charging and discharging circuit.

[0011] In some embodiments, the relay control circuit includes: a relay main control chip and a plurality of transistors;

[0012] The triode is arranged in the control circuit of the action coil of the relay;

[0013] The triodes are connected in parallel;

[0014] The control ends of the transistors connected in parallel are connected one-to-one with the control signal output ends of the relay main control chip.

[0015] The relay main control chip is connected to the battery information acquisition module, and is used to obtain the battery information, and output a control signal based on the battery information, and control the state of each of the transistors based on the control signal to control the state of the relay.

[0016] In some embodiments, it further includes: a Bluetooth display module;

[0017] The Bluetooth display module is connected to the battery information acquisition module for displaying the battery information;

[0018] The battery information includes charging and discharging data.

[0019] In some embodiments, the Bluetooth display module includes:

[0020] Bluetooth module and display screen;

[0021] The display screen is communicatively connected to the battery information acquisition module via the Bluetooth module.

[0022] In some embodiments, the Bluetooth module is a two-way Bluetooth module.

[0023] In some embodiments, the display screen is a touch display screen.

[0024] In some embodiments, it further includes: an active balancing circuit;

[0025] The active balancing circuit is connected to each battery cell of the battery pack respectively, and is used for actively balancing the energy of each battery cell.

[0026] In some embodiments, the active balancing circuit includes:

[0027] A high-frequency transformer, wherein each cell is provided with a pair of transformer windings;

[0028] A plurality of triodes are arranged in an energy exchange circuit composed of a battery cell and a corresponding transformer winding;

[0029] The balancing control chip is connected to the control terminals of each transistor and is used to control whether each energy exchange circuit is turned on to actively balance the energy of each battery cell.

[0030] In some embodiments, the active balancing circuit includes:

[0031] The balancing control chip is based on driving multiple transistors simultaneously with a PWM waveform.

[0032] A battery BMS management system provided in the present application includes: a relay, which is arranged on the charging and discharging circuit of a preset battery pack and is used to control the on and off of the charging and discharging circuit; a battery information acquisition module, which is used to collect battery information; a relay control circuit, which is respectively connected to the battery information acquisition module and the relay, and is used to obtain the battery information, and based on the battery information, control the state of the relay to control the on and off of the charging and discharging circuit. In this way, by using a relay as a control element, the system can provide high-reliability high-current control. The mechanical structure of the relay makes it more stable in a high-current environment, thereby ensuring the safety of the battery charging and discharging process. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] By describing the embodiments of the present application in more detail in conjunction with the accompanying drawings, the above and other purposes, features and advantages of the present application will become more apparent. The accompanying drawings are used to provide a further understanding of the embodiments of the present application and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the present application and do not constitute a limitation of the present application. In the accompanying drawings, the same reference numerals generally represent the same components or steps.

[0034] Figure 1 It is a structural diagram of a battery BMS management system provided by an embodiment of the present application.

[0035] Figure 2 It is a partial structural diagram of a battery BMS management system provided by an embodiment of the present application.

[0036] Figure 3 It is a partial structural diagram of a battery BMS management system provided in another embodiment of the present application.

[0037] Figure 4 This is a partial structural diagram of a battery BMS management system provided by another embodiment of the present application. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. 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.

[0039] Application Overview

[0040] In traditional battery BMS management systems, semiconductor devices such as transistors and field effect transistors (MOSFETs) are often used to control the on-off of battery charging and discharging. These devices perform well in low-current applications, but they may encounter reliability issues in high-current working environments. High currents may cause semiconductor devices to overheat, damage or fail, and these problems may cause the battery protection mechanism to not work properly, thereby increasing the risk of accidents. To solve this problem, the battery BMS management system uses a mechanically structured relay as a control element. The relay has a high current carrying capacity and can work stably in a high-current environment, providing reliable on-off control. The mechanical switching characteristics of the relay enable it to maintain stable contact under high current shocks, thereby ensuring the safety and reliability of the battery charging and discharging process.

[0041] Furthermore, due to the particularity of the process during the production of lithium batteries, there may be inconsistencies in the performance between battery cells, such as differences in voltage, capacity and internal resistance. This inconsistency will affect the overall performance and life of the battery pack, and may even cause some batteries to be overcharged or over-discharged, increasing safety risks. To solve this problem, the battery BMS management system uses magnetic material push-pull active balancing technology. With this technology, the system can monitor the status of each battery cell and actively adjust the energy distribution between the batteries so that each battery cell in the battery pack can reach a consistent state. This active balancing technology effectively improves the energy utilization and life of the battery pack, while reducing the safety risks caused by battery cell inconsistency.

[0042] Furthermore, the traditional battery BMS management system may need to be connected to the display screen or control panel through a wiring harness, which not only limits the layout flexibility of the system, but may also cause failures due to wear, damage or poor contact of the wiring harness. To overcome these problems, the battery BMS management system uses a wireless Bluetooth screen. Through wireless Bluetooth technology, battery information can be transmitted wirelessly to the display screen, and users can easily monitor and control the status of the battery without worrying about the constraints of the wiring harness. This wireless connection method improves the reliability and ease of use of the system, and also makes the design of the battery BMS management system more concise and flexible. Users can move or adjust the position of the display screen as needed without the constraints of the wiring harness, thereby improving the user experience and the practicality of the system.

[0043] After introducing the basic principles of the present application, various non-limiting embodiments of the present application will be described in detail with reference to the accompanying drawings.

[0044] Exemplary Systems

[0045] Figure 1 Schematic diagram of the structure of a battery BMS management system provided by an embodiment of the present application. Figure 1 As shown, the battery BMS management system includes:

[0046] Relay 1, arranged on the charge and discharge circuit of the preset battery pack, controls the on and off of the charge and discharge circuit;

[0047] Battery information collection module 3, used to collect battery information;

[0048] The relay control circuit 2 is connected to the battery information acquisition module 3 and the relay 1 respectively, and is used to obtain the battery information and control the state of the relay 1 based on the battery information to control the on and off of the charging and discharging circuit.

[0049] Specifically,

[0050] The relay is a key component in the battery BMS management system. It is set on the charging and discharging circuit of the battery pack. The main function of the relay is to control the on and off of the circuit according to the control signal, thereby managing the charging and discharging process of the battery. In a high current environment, the relay has higher reliability and durability than semiconductor devices such as transistors or MOSFETs. Its mechanical structure can maintain stable contact when the current passes through, and will not be damaged due to excessive current, ensuring the continuity and safety of the battery charging and discharging process.

[0051] Battery information acquisition module: The battery information acquisition module is responsible for monitoring and collecting various key parameters of the battery pack, such as voltage, current, temperature, etc. This information is essential for understanding the status and behavior of the battery. By monitoring these parameters in real time, the battery BMS management system can ensure that the battery operates within a safe operating range and take timely measures when abnormal conditions are detected.

[0052] Relay control circuit: The relay control circuit is the brain of the battery BMS management system. It is responsible for processing data from the battery information acquisition module and making decisions based on this data. The control circuit analyzes the status of the battery through an algorithm and controls the on and off status of the relay according to the preset protection parameters and strategies. When the battery information shows that charging or discharging is required, the control circuit will send a signal to close the relay to connect or disconnect the circuit. On the contrary, if overcharging, over-discharging or other potential safety issues are detected, the control circuit will instruct the relay to disconnect the circuit to protect the battery from damage.

[0053] The close collaboration of these three components ensures that the battery BMS management system can effectively monitor and manage the battery charging and discharging process. The relay provides stable control of large currents, the battery information acquisition module provides real-time battery status data, and the relay control circuit intelligently controls the battery charging and discharging based on this data. This design not only improves the battery life and performance, but also significantly enhances the safety and reliability of the system. In this way, the battery BMS management system can provide users with an efficient, safe and convenient battery use environment.

[0054] In some embodiments, reference Figure 2 The relay control circuit includes: a relay main control chip and a plurality of transistors; the transistors are arranged in the control circuit of the action coil of the relay; the transistors are connected in parallel; the control ends of the transistors connected in parallel are connected one by one with the control signal output end of the relay main control chip. The relay main control chip is connected to the battery information acquisition module to obtain the battery information, and output a control signal based on the battery information, and control the state of each transistor based on the control signal to control the state of the relay.

[0055] Specific reference Figure 2 , the multiple transistors can be 4 transistors, namely Q1, Q2, Q3 and Q4, with relay K1 as the closing and opening device. Q1Q2Q3Q4 controls the action coil of K1 relay. Q1Q2Q3Q4 is controlled by the battery acquisition management microcontroller based on the collected information and a certain algorithm calculation to control whether it is turned on or off, thereby realizing the on and off of the battery pack.

[0056] When the management microcontroller detects that the battery pack needs to be charged or discharged, it will send a control signal to turn on at least one of the transistors Q1, Q2, Q3 and Q4. In this way, current can flow through these turned-on transistors, and then power the action coil of relay K1, making it closed, thereby connecting the battery pack with the external circuit, allowing current to flow, and realizing charging and discharging. On the contrary, if it is detected that the battery pack is overcharged, over-discharged or other abnormal conditions, the management microcontroller will send a control signal to turn off all control transistors, causing the action coil of relay K1 to lose power and the relay to disconnect, thereby cutting off the connection between the battery pack and the external circuit, protecting the battery pack from damage.

[0057] In some embodiments, the battery BMS management system provided in the present application further includes: a Bluetooth display module 4; the Bluetooth display module 4 is communicatively connected to the battery information acquisition module 3, and is used to display the battery information; wherein the battery information includes charging and discharging data.

[0058] Among them, the main function of the Bluetooth display module 4 is to transmit the data collected by the battery information acquisition module 3 to a visual interface by wireless means. This interface can be an LCD display 41, an LED display 41 or other types of display devices, which are used to show the real-time status of the battery and important charging and discharging data to the user. In this way, the user can conveniently monitor the operation of the battery without directly contacting the internal circuit of the battery or the battery BMS management system.

[0059] Specifically, the communication between the Bluetooth display module and the battery information acquisition module is achieved through wireless Bluetooth technology. This wireless connection mode eliminates the constraints of traditional wired connections and improves the flexibility and portability of the system. Users can move the display module freely within a certain range without being restricted by the length of the cable. Among them, the Bluetooth display module may include: a Bluetooth module and a display screen; the display screen is connected to the battery information acquisition module through the Bluetooth module.

[0060] In actual applications, the Bluetooth display module can display a variety of battery information, the most important of which includes charge and discharge data. These data may include the battery's current voltage, current, charging status (such as charging progress, remaining charging time), discharge status (such as discharge rate, remaining power), etc. In addition, other relevant information such as battery temperature, battery health status, historical charge and discharge records, etc. can also be displayed.

[0061] Further, see Figure 3Wireless Bluetooth display screen. A small capacity battery is used to power the screen and the two-way Bluetooth module. The Bluetooth module is connected to the battery collection main control circuit to exchange and transmit display data. The screen completes the display and operation. Wireless connection achieved through Bluetooth technology provides users with greater flexibility and convenience. Users do not need to worry about the management and wiring of the harness, and can place the display module more freely, and even monitor the battery status on the move. In addition, wireless connection also reduces the risk of harness wear or damage, and improves the reliability of the system. Furthermore, in the above scheme, due to the use of a wireless Bluetooth screen, the harness constraint problem is also solved.

[0062] Specifically, the Bluetooth module is a two-way Bluetooth module. The display screen is a touch display screen.

[0063] Among them, the two-way Bluetooth module refers to a Bluetooth device that can receive and send data at the same time. In the battery BMS management system, this means that the Bluetooth module can not only receive data from the battery information acquisition module, but also send the user's control instructions back to the battery BMS management system. This two-way communication capability allows users to fully control the battery BMS management system through the Bluetooth display module, including but not limited to starting / stopping charging, adjusting charging parameters, querying historical data, etc. In addition, the two-way Bluetooth module can also support connections with other smart devices, such as smartphones, tablets or other remote monitoring systems, providing users with a wider range of application scenarios and a richer interactive experience.

[0064] A touch screen is a display device that can be operated directly by touch. Users can directly click, slide, and perform other operations on the screen with their fingers or other styluses to control the battery BMS management system. Touch screens usually have high resolution and good responsiveness, and can clearly display various parameters and status information of the battery. In addition, touch screens can also provide graphical user interfaces such as charts and curves, allowing users to understand the performance and health of the battery more intuitively. The use of touch screens simplifies user operations, reduces dependence on physical buttons or knobs, and improves the ease of use and modernity of the system.

[0065] Combined with the design of two-way Bluetooth module and touch display screen, the battery BMS management system can not only provide real-time and accurate battery status monitoring, but also realize remote control and intelligent interaction, which greatly improves the user's convenience and the intelligence level of the system. This design makes the battery BMS management system more in line with the needs and expectations of modern users, and provides users with an efficient, flexible and convenient battery management solution.

[0066] In some embodiments, the battery BMS management system further includes: an active balancing circuit 5; the active balancing circuit 5 is respectively connected to each battery cell of the battery pack to actively balance the energy of each battery cell.

[0067] It should be noted that during the manufacturing and use of lithium batteries, due to slight differences in the production process and the influence of the use environment and charge and discharge history, the energy of each cell in the battery pack may be inconsistent. This inconsistency may cause some cells to be overcharged or over-discharged, affecting the overall performance and life of the battery pack, and even increasing safety risks. The main function of the active balancing circuit is to ensure that all cells in the battery pack can operate at the same energy level by actively adjusting the energy distribution between each cell, thereby improving the overall performance and safety of the battery pack.

[0068] The working principle of the active balancing circuit is as follows: the active balancing circuit monitors the voltage and energy status of each cell by connecting to each cell in the battery pack. When an energy imbalance between cells is detected, the balancing circuit transfers energy from the high-energy cell to the low-energy cell through internal control logic and circuit design. This energy transfer is usually achieved through a high-frequency transformer or other energy transfer device to ensure the efficiency and safety of energy transfer. The active balancing circuit can increase the service life of the battery pack: through the active balancing circuit, each cell in the battery pack can maintain a similar energy level, avoiding premature aging of individual cells due to overcharging or over-discharging. This can extend the overall service life of the battery pack and reduce the frequency and cost of battery replacement. The active balancing circuit is usually driven by an intelligent control chip and algorithm, which can dynamically adjust the balancing strategy according to the actual working status and charge and discharge history of the battery pack. This intelligent design enables the battery BMS management system to adapt to different working conditions and usage habits, providing more accurate and efficient battery management. In this way, when using the battery pack, users do not need to worry about performance degradation or safety issues caused by inconsistent energy within the battery pack. The addition of active balancing circuit makes the performance of the battery pack more stable and reliable, improving the user experience.

[0069] Specifically, refer to Figure 4 The active balancing circuit includes: a high-frequency transformer, wherein each battery cell is provided with a pair of transformer windings; a plurality of transistors are provided in an energy exchange circuit composed of the battery cell and the corresponding transformer windings; and a balancing control chip connected to the control ends of each transistor, for controlling whether each energy exchange circuit is turned on, so as to actively balance the energy of each battery cell.

[0070] Among them, the high-frequency transformer is one of the core components in the active balancing circuit. It realizes energy transfer between battery cells through the principle of electromagnetic induction. Each battery cell is equipped with a pair of transformer windings, which can couple and convert energy in the high-frequency transformer. The high-frequency transformer can realize energy transfer between battery cells without directly connecting the battery cells, thus avoiding the loss and safety risks that may be caused by direct electrical connection.

[0071] Transistors act as switches in active balancing circuits. They are set between each battery cell and the corresponding transformer winding to form an energy exchange loop. The on and off states of the transistors determine whether energy can flow between the cells. By controlling the on and off states of the transistors, the energy inflow and outflow of each cell can be precisely adjusted to achieve energy balance between the cells.

[0072] The balancing control chip is the intelligent control center of the active balancing circuit. It is responsible for receiving the cell status information from the battery information acquisition module and calculating the energy difference between each cell according to the preset algorithm. Then, the balancing control chip will output the control signal to the control end of each transistor to control their on and off states, thereby controlling the operation of the energy exchange circuit. In this way, the balancing control chip can actively adjust the energy distribution between cells to ensure that all cells in the battery pack can operate at similar energy levels.

[0073] In actual applications, the energy balancing process is as follows: when the voltage of a cell in the battery pack is higher than that of other cells, the balancing control chip will control the corresponding transistor to conduct, so that the energy of the high-voltage cell flows to the low-voltage cell. Conversely, if the voltage of a cell is lower than that of other cells, the balancing control chip will control another set of transistors to conduct, so that the low-voltage cell can obtain energy from the high-voltage cell. Through this active energy transfer, the cells in the battery pack can achieve energy balance, thereby improving the performance and safety of the entire battery pack.

[0074] In summary, the active balancing circuit achieves precise control and balancing of the energy of each cell in the battery pack through the coordinated work of high-frequency transformers, multiple triodes and balancing control chips. This design not only improves the energy utilization and life of the battery pack, but also enhances the intelligence and automation level of the battery BMS management system, providing users with a more stable and reliable battery experience.

[0075] Specifically, the active balancing circuit includes: a balancing control chip that drives multiple transistors simultaneously based on a PWM waveform. The PWM waveform is an effective power control method that controls the average power output of the circuit by adjusting the switching time ratio of the current (i.e., the duty cycle). In the active balancing circuit, the PWM waveform is used to accurately control the conduction time of the transistors connected to each battery cell. In this way, the balancing control chip can adjust the energy flow between each battery cell to ensure the balance of the battery cell energy.

[0076] The active balancing circuit can drive multiple transistors at the same time in the above manner: in the battery pack, each cell is connected to the transformer winding of the high-frequency transformer through a transistor. The balancing control chip controls the conduction and cutoff of these transistors at the same time through the PWM waveform. When the transistor is turned on, the energy transfer between the cells begins; when the transistor is turned off, the energy transfer stops. By adjusting the duty cycle of the PWM waveform, the balancing control chip can control the duration and frequency of each energy transfer, thereby achieving precise energy balancing.

[0077] The balancing control chip is the intelligent core of the active balancing circuit. It is responsible for monitoring the status of each cell in the battery pack, including parameters such as voltage, current and temperature. Based on these parameters, the balancing control chip calculates the cell pairs that need to transfer energy and determines the appropriate PWM waveform parameters. Then, the chip outputs control signals to the corresponding transistors, driving them to turn on and off according to the calculated PWM waveform to achieve energy balance between cells.

[0078] With this arrangement, the active balancing circuit can effectively reduce the energy imbalance problem of the cells in the battery pack by driving multiple transistors simultaneously with the PWM waveform. This not only improves the energy utilization of the battery pack, but also helps to extend the service life of the battery pack by avoiding premature aging of individual cells due to overcharging or over-discharging. Furthermore, the active balancing circuit helps to maintain the battery pack within a safe operating range by precisely controlling the energy flow between cells. This reduces overcharging, over-discharging or other safety risks caused by cell energy imbalance and improves the safety of the entire battery system.

[0079] In practical applications, refer to Figure 4 , when there is an imbalance. For example, when the voltage of cell 1 is too high, the PWM waveform drives transistors Q11, Q12, Q13, Q14, Q15 and Q16 at the same time, and transfers energy to batteries 2 and 3 through a high-frequency transformer with a one-to-one winding, thereby achieving energy transfer.

[0080] In summary, the active balancing circuit based on PWM waveform driving multiple transistors at the same time provides an efficient and accurate energy balancing solution for the battery BMS management system. This design not only improves the performance and life of the battery pack, but also enhances the safety and reliability of the system, providing users with a more stable and efficient battery experience.

[0081] In the scheme provided by the present application, the whole circuit working logic is that the battery information acquisition module and the relay control circuit, according to the information collected inside the battery pack, compare the preset protection parameters, generate control instructions, drive the transistors Q1, Q2, Q3 and Q4, to control the action coil of the relay K1, realize the relay disconnection or closure, for battery protection, the battery pack is different according to the external access device (access to the charger is to charge the battery, access to the responsible battery is to discharge), and perform different charging and discharging. These charging data will be collected by the battery information acquisition module and processed by the software algorithm, and then transmitted to the Bluetooth display screen via Bluetooth, wherein the battery information acquisition module includes a Bluetooth module; but when the battery pack has a pressure difference inside the battery pack as the number of cycles increases, when a group of battery cells has a high voltage. The balancing circuit is driven by the balancing control chip at the same time Q11, Q12, Q13, Q14, Q15 and Q16, and the energy is transferred to the battery with a lower voltage through a high-frequency transformer with a one-to-one winding. Thereby achieving energy transfer and active balancing between battery cells. Among them, the balancing control chip can collect the information of the battery cells by itself, and can also connect to the battery information collection module to obtain the information of the battery cells.

[0082] The above description has been given for the purpose of illustration and description. In addition, this description is not intended to limit the embodiments of the present application to the forms disclosed herein. Although multiple example aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, changes, additions and sub-combinations thereof.

Claims

1. A battery BMS management system, characterized in that: include: A relay, arranged on a charge and discharge circuit of a preset battery pack, for controlling the on and off of the charge and discharge circuit; A battery information collection module is used to collect battery information; The relay control circuit is connected to the battery information acquisition module and the relay respectively, and is used to obtain the battery information and control the state of the relay based on the battery information to control the on and off of the charging and discharging circuit.

2. The battery BMS management system according to claim 1, characterized in that: The relay control circuit comprises: a relay main control chip and a plurality of transistors; The triode is arranged in the control circuit of the action coil of the relay; The triodes are connected in parallel; The control ends of the triodes connected in parallel are connected one by one to the control signal output ends of the relay main control chip; The relay main control chip is connected to the battery information acquisition module, and is used to obtain the battery information, and output a control signal based on the battery information, and control the state of each of the transistors based on the control signal to control the state of the relay.

3. The battery BMS management system according to claim 1, characterized in that: Also includes: Bluetooth display module; The Bluetooth display module is communicatively connected with the battery information acquisition module, and is used to display the battery information; The battery information includes charging and discharging data.

4. The battery BMS management system according to claim 3, characterized in that: The bluetooth display module comprises: Bluetooth module and display screen; The display screen is communicatively connected to the battery information acquisition module via the Bluetooth module.

5. The battery BMS management system according to claim 4, characterized in that: The Bluetooth module is a bidirectional Bluetooth module.

6. The battery BMS management system according to claim 4, characterized in that: The display screen is a touch display screen.

7. The battery BMS management system according to claim 1, characterized in that: Also includes: Active equalization circuit; The active balancing circuit is connected to each battery cell of the battery pack respectively, and is used for actively balancing the energy of each battery cell.

8. The battery BMS management system according to claim 7, characterized in that: The active balancing circuit comprises: A high-frequency transformer, wherein each cell is provided with a pair of transformer windings; A plurality of triodes are arranged in an energy exchange circuit composed of a battery cell and a corresponding transformer winding; The balancing control chip is connected to the control terminals of each transistor and is used to control whether each energy exchange circuit is turned on to actively balance the energy of each battery cell.

9. The battery BMS management system according to claim 8, characterized in that: The active balancing circuit comprises: The balancing control chip is based on driving multiple transistors simultaneously with a PWM waveform.

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