Battery charging and discharging and parallel capacity expansion control method based on BMS

Abstract

The invention belongs to the technical field of battery management, and particularly relates to a battery charging and discharging and parallel capacity expansion control method based on a BMS (Battery Management System), which comprises the following steps: step 1, controlling a charging mode; step 2, discharging mode control; step 3, charging and discharging mode control; and 4, controlling a parallel expansion mode of the battery pack. The BMS battery management system and the DC / DC converter are integrated together, the size and weight of the system can be effectively reduced, the energy conversion efficiency is improved, the hardware cost is reduced, and the overall design and maintenance are simplified. According to the integrated design, battery management and voltage conversion are more coordinated, intelligent control and higher system reliability can be achieved, heat dissipation is optimized, fault points are reduced, the performance and safety of the whole system are improved, the system is controlled by a whole central controller, and the protection level of the system is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of battery management, and in particular to a battery charging, discharging and parallel expansion control method based on a BMS. Background Art

[0002] BMS battery management system is a system used to manage and monitor the performance of battery packs. It is widely used in various fields such as electric vehicles, energy storage systems, portable electronic devices, etc. Its main function is to ensure the safe and efficient operation of batteries and extend their service life. With the continuous development of battery technology, especially the widespread application of lithium-ion batteries, battery management and monitoring have become particularly important.

[0003] The separate BMS battery management system in the prior art cannot fully consider the actual conditions of the battery, such as temperature, SOC, battery charging power, load operating power, etc. to adjust the battery charge and discharge current in real time, so that the battery operates in its optimal state and prolongs its service life.

[0004] At present, the common solution for the control of battery charging and discharging current and voltage is to configure a battery protection board for the battery, and then add an additional DC / DC buck-boost module. This will result in high cost and large size. At the same time, since the DC / DC circuit is external, the protection level of the system will be too low. Secondly, due to the lack of real-time temperature detection devices, charging in low temperature conditions will be dangerous, and the current BMS battery management system usually does not directly support the power distribution problem when multiple battery packs are connected in parallel. Although most BMS can manage the status and health of a single battery pack, the existing BMS system still has certain limitations in terms of power distribution, load balancing and coordination when multiple battery packs are connected in parallel. Summary of the invention

[0005] 1. Technical issues to be solved

[0006] The purpose of the present invention is to solve the problem that the BMS battery management system in the prior art cannot fully consider the actual situation of the battery, and to propose a battery charging and discharging and parallel expansion control method based on BMS.

[0007] 2. Technical solution

[0008] In order to achieve the above object, the present invention adopts the following technical solutions:

[0009] A battery charging, discharging and parallel expansion control circuit based on BMS, including a central controller, a battery module, a temperature sensor, an analog front end, a fuse, a charging and discharging MOS tube circuit and a driving circuit thereof, a charging interface circuit, a discharging interface circuit, a first DC / DC converter, a second DC / DC converter, a first current sensor, a second current sensor, a first current sampling circuit and a second current sampling circuit. The battery module is connected to the central controller via a temperature sensor, the analog front end is connected to the input end of the battery module, and the output end of the analog front end is connected to the input end of the central controller;

[0010] A fuse is provided between the battery module and the charge and discharge MOS tube circuit, the output ends of the charge and discharge MOS tube circuit and the central controller are connected to the input end of the first DC / DC converter, the central controller is connected to the charge and discharge MOS tube circuit via a drive circuit, and the first DC / DC converter is connected to the input end of the discharge interface circuit via a first current sensor;

[0011] The first current sensor is connected to the central controller through a first current sampling circuit, the output end of the central controller is connected to the input end of the second DC / DC converter, the output end of the second DC / DC converter is connected to the charging and discharging MOS tube circuit, the output end of the charging interface circuit is connected to the second DC / DC converter through a second current sensor, and the second current sensor is connected to the central controller through a second current sampling circuit.

[0012] Preferably, the analog front end is used to collect voltage, current, temperature and SOC data of the battery module.

[0013] Preferably, the central controller is used to coordinate and manage battery module charging, discharging, protection, state estimation and communication with other systems.

[0014] Preferably, the charging and discharging MOS tube circuit comprises a charging MOS circuit and a discharging MOS circuit, which are used to select a specific number of MOS tubes according to the size of the charging and discharging current.

[0015] Preferably, the first DC / DC converter and the second DC / DC converter are used to adjust the charging current according to the actual situation of the battery and the ambient temperature.

[0016] Preferably, the first current sensor and the first current sampling circuit are used to detect the current in the discharge circuit. The first current sensor converts the electromagnetic effect or voltage drop generated inside the sensor by the current flowing through the sensor into a voltage signal proportional to the current and transmits it to the first current sampling circuit to obtain an accurate current value in the circuit and feed it back to the central controller.

[0017] Preferably, the second current sensor and the second current sampling circuit are used to detect the current in the charging circuit. The second current sensor converts the electromagnetic effect or voltage drop generated inside the sensor by the current flowing through the sensor into a voltage signal proportional to the current and transmits it to the second current sampling circuit to obtain the accurate current value in the circuit and feed it back to the central controller.

[0018] Preferably, the charging interface circuit is responsible for transmitting external electrical energy to the battery module, regulating the charging current and voltage, ensuring the safety of the charging process and preventing overcharging; the discharging interface circuit is responsible for transmitting the electrical energy in the battery to the load, monitoring the discharge current and voltage, and ensuring that the battery is not over-discharged.

[0019] The present invention also proposes a battery charging and discharging and parallel expansion control method based on BMS, comprising the following steps:

[0020] Step 1: Charging mode control, first connect the power supply to the charging interface, then connect to the second DC / DC converter through the current sensor, charge the battery module through the charging MOS tube circuit and the fuse, the driving circuit is used to drive the opening and closing of the charging and discharging MOS tube circuit, the size of the charging current can be adjusted by the central controller to meet the requirements of the DC / DC converter, the analog front end and the temperature sensor can accurately transmit the battery information and temperature information to the central controller, and the DC / DC converter circuit is adjusted and controlled by the central controller, the current sensor can collect current information, and the current in the loop is fed back to the central controller through the current sampling circuit;

[0021] Step 2: Discharge mode control, the battery module is connected through a fuse, a discharge MOS tube circuit, a drive circuit, a first DC / DC converter, a first current sensor, a discharge interface circuit and a load; the drive circuit can drive the discharge MOS tube circuit. During the discharge process, the BMS needs to ensure that the battery does not output a current exceeding its safety limit. Excessive discharge current can cause battery overheating, internal damage, and may even cause thermal runaway and other problems; the integrated DC / DC converter can intelligently adjust the discharge current according to the battery's health status, remaining power, temperature and other factors to achieve controllable discharge current and ensure that the battery always operates within a safe range;

[0022] Step 3: charge and discharge mode control, the battery module is connected through the fuse, the discharge MOS tube circuit, the first DC / DC converter, the first current sensor, the discharge interface circuit and the load to realize the discharge function, and the power supply, the charging interface circuit, the second current sensor, the second DC / DC converter, the charging MOS tube circuit, the fuse, and the battery module to realize the charging function;

[0023] Step 4: Control of the parallel expansion mode of multiple battery packs. The BMS battery management system and the DC / DC converter circuit are integrated into one to meet the needs of parallel expansion of multiple battery packs. An independent BMS central controller is equipped on each battery module, and each central controller is connected and coordinated through a bus; each central controller can obtain various information such as the voltage, current, SOC, temperature, etc. of the battery pack, and can be reasonably allocated according to the status of each subsystem to avoid overcharging and over-discharging.

[0024] 3. Beneficial effects

[0025] Compared with the prior art, the advantages of the present invention are:

[0026] (1) In the present invention, the BMS battery management system and the DC / DC converter are integrated together, which can effectively reduce the volume and weight of the system, improve energy conversion efficiency, reduce hardware costs, and simplify overall design and maintenance. The integrated design makes battery management and voltage conversion more coordinated, can achieve intelligent control and higher system reliability, while optimizing heat dissipation and reducing failure points, thereby improving the performance and safety of the overall system. The system is controlled by an integrated central controller to improve the protection level of the system.

[0027] (2) In the present invention, the BMS battery management system can detect the real-time status of the battery, including the battery's SOC, voltage, current, temperature and other information, whether the battery is in a charging state or a battery discharging state, and adjust the size of the charging and discharging current according to demand, and prevent the battery from overcharging, over-discharging, overcurrent and other problems. At the same time, due to the existence of the DC / DC converter circuit, it can better realize functions such as voltage matching. The system not only ensures the safe operation of the battery, but also improves the performance of the battery through real-time monitoring and intelligent adjustment, so that the battery can maintain the best state under different working conditions, which is conducive to improving the service life of the battery, thereby realizing efficient energy management.

[0028] (3) In the present invention, the BMS battery management system has a flexible structure and supports parallel configuration of multiple battery packs for scalability. Each module is equipped with an independent BMS controller, and they are connected and coordinated through a bus, and can be reasonably allocated according to the status of each subsystem. For example, when the voltage of a battery pack reaches the set upper limit, the relevant BMS will notify other BMSs to adjust the charging strategy to avoid overcharging of certain battery packs. The bus can also transmit global information, such as the overall SOC of the entire system, or the health status of the system, for the central controller or user to monitor and optimize decisions. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1A flow chart of the battery charging, discharging and parallel expansion control method based on BMS proposed in the present invention;

[0030] Figure 2 This is a schematic diagram of the structure of the battery charging, discharging and parallel expansion control circuit based on BMS proposed by the present invention;

[0031] Figure 3 The electrical connection diagram of the multi-battery parallel expansion proposed by the present invention;

[0032] Figure 4 The analog front end AFE circuit diagram proposed by the present invention;

[0033] Figure 5 The current sampling circuit diagram proposed by the present invention;

[0034] Figure 6 A communication circuit diagram proposed by the present invention;

[0035] Figure 7 The charging DC / DC circuit diagram proposed by the present invention;

[0036] Figure 8 This is a discharge DC / DC circuit diagram proposed by the present invention.

[0037] In the figure: 1 battery module, 2 fuse, 3 temperature sensor, 4 analog front end, 5 central controller, 6 charging and discharging MOS tube circuit, 7 driving circuit, 8 first DC / DC converter, 9 second DC / DC converter, 10 first current sensor, 11 first current sampling circuit, 12 second current sensor, 13 second current sampling circuit, 14 discharge interface circuit, 15 charging interface circuit, 16 external load, 17 power supply. DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0039] Embodiment 1:

[0040] Reference Figure 1-8 , a battery charging and discharging and parallel expansion control circuit based on BMS, including a central controller 5, a battery module 1, a temperature sensor 3, an analog front end 4, a fuse 2, a charging and discharging MOS tube circuit 6 and its driving circuit 7, a charging interface circuit 15, a discharging interface circuit 14, a first DC / DC converter 8, a second DC / DC converter 9, a first current sensor 10, a second current sensor 12, a first current sampling circuit 11 and a second current sampling circuit 13, wherein the battery module 1 is connected to the central controller 5 via the temperature sensor 3;

[0041] In the present invention, the central controller 5 is used to coordinate and manage the charging, discharging, protection, state estimation and communication with other systems of the battery module 1, the analog front end 4 is connected to the input end of the battery module 1, and the output end of the analog front end 4 is connected to the input end of the central controller 5, and the analog front end 4 is used to collect the voltage, current, temperature and SOC data of the battery module 1;

[0042] In the present invention, a fuse 2 is provided between the battery module 1 and the charge-discharge MOS tube circuit 6. The charge-discharge MOS tube circuit 6 includes a charge MOS circuit and a discharge MOS circuit, which are used to select a specific number of MOS tubes according to the size of the charge-discharge current. The output ends of the charge-discharge MOS tube circuit 6 and the central controller 5 are both connected to the input end of the first DC / DC converter 8.

[0043] In the present invention, the central controller 5 is connected to the charging and discharging MOS tube circuit 6 through a driving circuit 7, the first DC / DC converter 8 is connected to the input end of the discharge interface circuit 14 through a first current sensor 10, and the first DC / DC converter 8 and the second DC / DC converter 9 are used to adjust the size of the charging current according to the actual situation of the battery and the ambient temperature;

[0044] In the present invention, the first current sensor 10 is connected to the central controller 5 via the first current sampling circuit 11. The first current sensor 10 and the first current sampling circuit 11 are used to detect the current in the discharge circuit. The first current sensor 10 converts the electromagnetic effect or voltage drop generated inside the sensor by the current flowing through into a voltage signal proportional to the current and transmits it to the first current sampling circuit 11 to obtain an accurate current value in the circuit and feed it back to the central controller 5. The output end of the central controller 5 is connected to the input end of the second DC / DC converter 9.

[0045] In the present invention, the output end of the second DC / DC converter 9 is connected to the charge and discharge MOS tube circuit 6, and the output end of the charging interface circuit 15 is connected to the second DC / DC converter 9 through the second current sensor 12. The charging interface circuit 15 is responsible for transmitting external electric energy to the battery module 1, regulating the charging current and voltage, ensuring the safety of the charging process and preventing overcharging; the discharge interface circuit 14 is responsible for transmitting the electric energy in the battery to the load, monitoring the discharge current and voltage, and ensuring that the battery is not over-discharged. The second current sensor 12 is connected to the central controller 5 through the second current sampling circuit 13;

[0046] In the present invention, the second current sensor 12 and the second current sampling circuit 13 are used to detect the current in the charging circuit. The second current sensor 12 converts the electromagnetic effect or voltage drop generated inside the sensor by the current flowing through the sensor into a voltage signal proportional to the current and transmits it to the second current sampling circuit 13 to obtain an accurate current value in the circuit and feed it back to the central controller 5.

[0047] In the present invention, the battery charging and discharging and parallel expansion control method based on BMS includes the following steps:

[0048] Step 1: Charging mode control, first connect the power supply 17 to the charging interface, connect the second DC / DC converter 9 after passing through the current sensor, charge the battery module 1 through the charging MOS tube circuit and the fuse 2, the driving circuit 7 is used to drive the opening and closing of the charging and discharging MOS tube circuit 6, the size of the charging current can be adjusted by the central controller 5 to meet the requirements of the DC / DC converter, the analog front end 4 and the temperature sensor 3 can accurately transmit the battery information and temperature information to the central controller 5, and the central controller 5 is used to implement the adjustment and control of the DC / DC converter circuit, the current sensor can collect current information, and feed back the current in the loop to the central controller 5 through the current sampling circuit; for example, when the ambient temperature is too low, the temperature sensor can transmit the collected temperature information to the central controller, and the DC / DC converter can be controlled to reduce the charging current to avoid the dangerous situation of low-temperature charging. At the same time, during the charging process, when there is an overcurrent problem in the loop, or the battery temperature is too high, the central controller can timely control the fuse or control the driving circuit to interrupt the charging MOS circuit to achieve the purpose of terminating charging. At this time, the battery can be effectively protected to work within its safety range and extend its service life;

[0049] Step 2: Discharge mode control, the battery module 1 is connected through the fuse 2, the discharge MOS tube circuit, the drive circuit 7, the first DC / DC converter 8, the first current sensor 10, the discharge interface circuit 14 and the load 16; wherein the drive circuit 7 can drive the discharge MOS tube circuit. During the discharge process, the BMS needs to ensure that the battery does not output a current exceeding its safety limit. Excessive discharge current can cause battery overheating, internal damage, and may even cause thermal runaway and other problems; the integrated DC / DC converter can intelligently adjust the discharge current according to the battery's health status, remaining power, temperature and other factors to achieve controllable discharge current and ensure that the battery always operates within a safe range; at the same time, in some scenarios, the battery voltage does not match the required load voltage. For example, the battery voltage level in electric vehicles is usually relatively high, while some devices and some systems or equipment require a lower voltage to operate. The DC / DC converter can convert the battery voltage to the required voltage level, thereby achieving voltage matching between the battery and the load;

[0050] Step 3: charge and discharge mode control, the battery module 1 is connected through the fuse 2, the discharge MOS tube circuit, the first DC / DC converter 8, the first current sensor 10, the discharge interface circuit 14 and the load to realize the discharge function, and the power supply 17, the charging interface circuit 15, the second current sensor 12, the second DC / DC converter 9, the charging MOS tube circuit, the fuse 2, and the battery module 1 to realize the charging function;

[0051] Step 4: Control of the parallel expansion mode of multiple battery packs. The BMS battery management system and the DC / DC converter circuit are integrated to meet the needs of parallel expansion of multiple battery packs. An independent BMS central controller is equipped on each battery module 1, and each central controller 5 is connected and coordinated through a bus; each central controller 5 can obtain various information such as the voltage, current, SOC, temperature, etc. of the battery pack, and can be reasonably allocated according to the status of each subsystem to avoid overcharging and over-discharging; for example, when the voltage of a battery pack reaches the set upper limit, the relevant BMS central controller will notify other BMS central controllers to adjust the charging strategy to avoid overcharging of certain battery packs. The bus can also transmit global information, such as the overall SOC of the entire system, or the health status of the system, for the central controller or user to monitor and optimize decisions.

[0052] In the present invention, the BMS battery management system and the DC / DC converter are integrated together, which can effectively reduce the volume and weight of the system, improve energy conversion efficiency, reduce hardware costs, and simplify overall design and maintenance. The integrated design makes battery management and voltage conversion more coordinated, can achieve intelligent control and higher system reliability, while optimizing heat dissipation and reducing failure points, thereby improving the performance and safety of the overall system. The system is controlled by an integrated central controller to improve the protection level of the system.

[0053] In the present invention, whether the battery is in a charging state or a discharging state, the BMS battery management system can detect the real-time state of the battery including the battery's SOC, voltage, current, temperature and other information, and adjust the size of the charge and discharge current according to demand, and prevent the battery from overcharging, overdischarging, overcurrent and other problems. At the same time, due to the existence of the DC / DC converter circuit, the voltage matching and other functions can be better realized. The system not only ensures the safe operation of the battery, but also improves the performance of the battery through real-time monitoring and intelligent adjustment, so that the battery can maintain the best state under different working conditions, which is conducive to improving the service life of the battery, thereby realizing efficient energy management.

[0054] In the present invention, the BMS battery management system has a flexible structure and supports parallel configuration of multiple battery packs in consideration of scalability. Each module is equipped with an independent BMS controller, which is connected and coordinated through a bus and can be reasonably allocated according to the status of each subsystem. For example, when the voltage of a battery pack reaches the set upper limit, the relevant BMS will notify other BMSs to adjust the charging strategy to avoid overcharging of certain battery packs. The bus can also transmit global information, such as the overall SOC of the entire system, or the health status of the system, for the central controller or user to monitor and optimize decisions.

[0055] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A battery charging, discharging and parallel expansion control circuit based on BMS, comprising a central controller (5), a battery module (1), a temperature sensor (3), an analog front end (4), a fuse (2), a charging and discharging MOS tube circuit (6) and its driving circuit (7), a charging interface circuit (15), a discharging interface circuit (14), a first DC / DC converter (8), a second DC / DC converter (9), a first current sensor (10), a second current sensor (12), a first current sampling circuit (11) and a second current sampling circuit (13), characterized in that: The battery module (1) and the central controller (5) are connected via a temperature sensor (3), the analog front end (4) is connected to an input end of the battery module (1), and the output end of the analog front end (4) is connected to an input end of the central controller (5); A fuse (2) is provided between the battery module (1) and the charge-discharge MOS tube circuit (6); the output ends of the charge-discharge MOS tube circuit (6) and the central controller (5) are both connected to the input end of a first DC / DC converter (8); the central controller (5) and the charge-discharge MOS tube circuit (6) are connected via a drive circuit (7); and the first DC / DC converter (8) and the input end of the discharge interface circuit (14) are connected via a first current sensor (10); The first current sensor (10) is connected to the central controller (5) via a first current sampling circuit (11); the output end of the central controller (5) is connected to the input end of the second DC / DC converter (9); the output end of the second DC / DC converter (9) is connected to the charging and discharging MOS tube circuit (6); the output end of the charging interface circuit (15) is connected to the second DC / DC converter (9) via a second current sensor (12); and the second current sensor (12) is connected to the central controller (5) via a second current sampling circuit (13).

2. The battery charging, discharging and parallel expansion control circuit based on BMS according to claim 1, characterized in that: The analog front end (4) is used to collect voltage, current, temperature and SOC data of the battery module (1).

3. The battery charging, discharging and parallel expansion control circuit based on BMS according to claim 1, characterized in that: The central controller (5) is used to coordinate and manage the charging, discharging, protection, state estimation of the battery module (1) and communication with other systems.

4. The battery charging, discharging and parallel expansion control circuit based on BMS according to claim 1, characterized in that: The charging and discharging MOS tube circuit (6) comprises a charging MOS circuit and a discharging MOS circuit, and is used to select a specific number of MOS tubes according to the magnitude of the charging and discharging current.

5. The battery charging, discharging and parallel expansion control circuit based on BMS according to claim 1, characterized in that: The first DC / DC converter (8) and the second DC / DC converter (9) are used to adjust the magnitude of the charge and discharge current according to the actual situation of the battery and the ambient temperature.

6. The battery charging, discharging and parallel expansion control circuit based on BMS according to claim 1, characterized in that: The first current sensor (10) and the first current sampling circuit (11) are used to detect the current in the discharge circuit. The first current sensor (10) converts the electromagnetic effect or voltage drop generated inside the sensor by the current flowing through the sensor into a voltage signal proportional to the current and transmits the voltage signal to the first current sampling circuit (11), thereby obtaining an accurate current value in the circuit and feeding it back to the central controller (5).

7. The battery charging, discharging and parallel expansion control circuit based on BMS according to claim 1, characterized in that: The second current sensor (12) and the second current sampling circuit (13) are used to detect the current in the charging circuit. The second current sensor (12) converts the electromagnetic effect or voltage drop generated inside the sensor by the current flowing through the sensor into a voltage signal proportional to the current and transmits it to the second current sampling circuit (13), thereby obtaining an accurate current value in the circuit and feeding it back to the central controller (5).

8. The battery charging, discharging and parallel expansion control circuit based on BMS according to claim 1, characterized in that: The charging interface circuit (15) is responsible for transmitting external electric energy to the battery module (1), regulating the charging current and voltage, ensuring the safety of the charging process and preventing overcharging; the discharging interface circuit (14) is responsible for transmitting the electric energy in the battery to the load, monitoring the discharge current and voltage, and ensuring that the battery is not over-discharged.

9. The battery charging, discharging and parallel expansion control method based on BMS according to any one of claims 1 to 8, characterized in that: The following steps are involved: Step 1: Charging mode control, first connect the power supply (17) to the charging interface, and then connect to the second DC / DC converter (9) through the current sensor, and charge the battery module (1) through the charging MOS tube circuit and the fuse (2). The driving circuit (7) is used to drive the charging and discharging MOS tube circuit (6) to open and close. The size of the charging current can be adjusted by the central controller (5) to meet the requirements of the DC / DC converter. The analog front end (4) and the temperature sensor (3) can accurately transmit the battery information and temperature information to the central controller (5). The DC / DC converter circuit is regulated and controlled by the central controller (5). The current sensor can collect current information, and the current in the loop is fed back to the central controller (5) through the current sampling circuit. Step 2: Discharge mode control, the battery module (1) is connected via a fuse (2), a discharge MOS tube circuit, a drive circuit (7), a first DC / DC converter (8), a first current sensor (10), a discharge interface circuit (14) and a load (16); wherein the drive circuit (7) can drive the discharge MOS tube circuit. During the discharge process, the BMS needs to ensure that the battery does not output a current exceeding its safety limit. Excessive discharge current may cause battery overheating, internal damage, and may even cause thermal runaway and other problems. The integrated DC / DC converter can intelligently adjust the discharge current according to factors such as the battery's health status, remaining power, and temperature, thereby achieving controllable discharge current and ensuring that the battery always operates within a safe range. Step 3: Controlling the charge and discharge mode, the battery module (1) is connected via a fuse (2), a discharge MOS tube circuit, a first DC / DC converter (8), a first current sensor (10), a discharge interface circuit (14) and a load (16) to realize a discharge function, and at the same time, a power supply (17), a charge interface circuit (15), a second current sensor (12), a second DC / DC converter (9), a charge MOS tube circuit, a fuse (2) and a battery module (1) to realize a charge function; Step 4: Control of the parallel expansion mode of multiple battery packs. The BMS battery management system and the DC / DC converter circuit are integrated into one to meet the needs of parallel expansion of multiple battery packs. An independent BMS central controller is equipped on each battery module (1), and each central controller (5) is connected and coordinated through a bus; each central controller (5) can obtain various information such as the voltage, current, SOC, temperature, etc. of the battery pack, and can reasonably allocate it according to the status of each subsystem to avoid overcharging and over-discharging.

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