BMS power supply control system and circuit protection board

Abstract

The BMS power supply control system is mainly composed of the following parts: a BMS controller, a first switch, a second switch, a DC / DC module, a main power supply circuit, a switching circuit, a backup battery and a charging wake-up circuit. The BMS controller can send a control signal to the first switch and can also send a control signal to the second switch. One end of the first switch is connected to the positive electrode of the battery pack, one end of the second switch is connected to the positive electrode of the charging port, and the output ends of the first switch and the second switch are connected to the DC / DC module. And the DC / DC module is connected to the main power supply circuit. The main power supply circuit supplies power to the BMS system through the switching circuit, and the switching circuit is also connected with the backup battery. The backup battery provides a backup power supply when the system works normally. When the BMS system is in a dormant state, the charging wake-up circuit can wake up the BMS system to ensure that the system can recover to work at any time. Multiple power supply modes can be flexibly switched, the battery cell is effectively protected, and therefore the service life of the battery cell is prolonged.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of energy storage batteries, in particular to a BMS power supply control system and a circuit protection board. BACKGROUND

[0002] With the development of science and technology and the improvement of people's living standards, energy storage electronic products are increasingly favored by consumers, among which portable outdoor energy storage power supplies are most popular among consumers. People go camping outdoors during their leisure time, at which time an outdoor power supply is particularly important, which can meet people's daily electronic device charging, electric kettle water boiling, electric stove cooking and other power supply needs of a series of electrical appliances, thereby improving the quality of outdoor camping. However, due to different camping time lengths and different numbers of electrical appliances, there is an embarrassing problem that an outdoor power supply with too small capacity will cause people to be anxious about electricity, and an outdoor power supply with too large capacity is too heavy and inconvenient to carry. At this time, a method is needed to make the energy storage power supply meet the needs of different use conditions. CONTENT OF THE INVENTION

[0003] To solve the above technical problems, the application provides a BMS power supply control system, a circuit and a circuit protection board

[0004] In a first aspect, the application provides a BMS power supply control system, characterized in that the BMS power supply control system comprises a BMS controller, a first switch, a second switch, a DC / DC module, a main power supply circuit, a switching circuit, a backup battery and a charging wake-up circuit.

[0005] The BMS controller can send a first control signal to the first switch, and the BMS controller can also send a second control signal to the second switch.

[0006] The first switch input end is connected to the positive pole of the battery pack of the BMS system, and the second switch is connected to the positive pole of the charging port of the BMS system, the first switch output end and the second switch output end are connected to the DC / DC module; the DC / DC module is connected to the main power supply circuit; the main power supply circuit is connected to the switching circuit; the backup battery is also connected to the switching circuit; the switching circuit supplies power to the entire BMS system; and the charging wake-up circuit is used to wake up the BMS system when the BMS system is in a dormant state.

[0007] Through the cooperative work of the first switch and the second switch, the system can switch the power supply mode between different working states. This flexibility can select the most suitable power supply mode according to different needs, thereby ensuring the stability and high efficiency of the BMS system under various working conditions.

[0008] Through reasonable power switching strategies, the battery can be prevented from working under unnecessary high load, effectively reducing battery loss and decay rate, thereby prolonging the service life of the battery.

[0009] Ensure continuous power supply of the system: the combination of the switching circuit and the backup battery enables the backup battery to continue to provide power for the BMS system when the main power fails or the system is in sleep state, avoiding the loss of system function at critical moment and improving the reliability of the system.

[0010] The charging wake-up circuit can wake up the system in time when the BMS system enters the sleep state, ensuring that the system can resume normal work when needed and improving the intelligent management and automation level of the system.

[0011] Further, the first switch comprises:

[0012] The base of MOS tube Q3 is connected to the BMS controller through resistor R10, the source of MOS tube Q3 is grounded, and the drain of MOS tube Q3 is connected to the anode of diode D5; the cathode of diode D5 is connected to the first DC power supply; the first switch optocoupler is connected in parallel with diode D5, the input end of the first switch optocoupler is connected to the positive pole of the charging port, and the output end of the first switch optocoupler is connected to the DC / DC module.

[0013] Further, the second switch comprises:

[0014] The base of MOS tube Q4 is connected to the BMS controller through resistor R11, the source of MOS tube Q4 is grounded, and the drain of MOS tube Q4 is connected to the anode of diode D6; the cathode of diode D6 is connected to the second DC power supply; the second switch optocoupler is connected in parallel with diode D6, the input end of the second switch optocoupler is connected to the positive pole of the charging port, and the output end of the second switch optocoupler is connected to the DC / DC module.

[0015] In the first switch, the combination of MOS tube Q3 and diode D5 can effectively control the current flow direction and prevent reverse current flow, avoiding damage to the battery pack and other circuits.

[0016] In the second switch, the combination of MOS tube Q4 and diode D6 can also provide current control and ensure that the current only flows in the predetermined direction, further improving the safety and stability of the system.

[0017] Through the switching control of MOS tube and the feedback mechanism of optocoupler, the first switch and the second switch can respond faster to the control signal of the BMS controller, realizing precise power switching and management.

[0018] The use of optocoupler enables electrical isolation, thereby improving the anti-interference ability and protection ability of the system, avoiding control failure caused by high voltage or current fluctuation.

[0019] Further, the DC / DC module includes a DC-DC chip, which includes a Vi+ port, a Vi- port, a +Vo port, and a 0V port; the Vi+ port is connected to the first switch and the second switch, the Vi- port is connected to the negative pole of the charging port, the +Vo port is connected to the main power circuit, and the 0V port is grounded.

[0020] In this design, the DC / DC module plays a crucial role, and its function is to convert high-voltage direct current (usually from a battery pack or external power supply) into low-voltage 12V direct current through step-down conversion, providing stable power support for the entire battery management system (BMS). Specifically, the design of the DC / DC module is not just a simple voltage conversion, it also involves power isolation, protection, and driving, and other key functions to ensure that the BMS system can safely and efficiently operate in complex electrical environments.

[0021] Further, the main power circuit includes a step-down chip, which includes a Vin port and a Vout port; the Vin port is connected to the DC / DC module; and the Vout port is connected to the switching circuit.

[0022] In the BMS, the design of the main power supply is crucial, especially for the MCU (Micro Control Unit) core control unit, the stability of the power supply directly affects the reliability and response ability of the system.

[0023] Further, the switching circuit includes:

[0024] The MOS tube Q2 drain is connected to the BMS system power supply end, the MOS tube Q2 base is connected to the main power circuit and the anode of diode D3, and is also grounded through resistor R6, the MOS tube Q2 source is connected to the cathode of diode D2; the anode of diode D2 is connected to the backup battery; and the cathode of diode D3 is connected to the BMS system power supply end.

[0025] The switching circuit can effectively automatically switch between the main power supply and the backup battery through the cooperation of MOS tube Q2 and diodes D2 and D3, ensuring that the BMS system can still provide power through the backup battery when the main power supply fails. The voltage division effect of resistor R6 ensures the switching control of the MOS tube, so that the entire circuit can work stably under different power supply states.

[0026] Further, the charging wake-up circuit further comprises: the 1 port of the optical coupler U1 is connected to the positive pole of the charging port through a plurality of resistors, the 2 port of the optical coupler U1 is connected to the negative pole of the charging port, and a resistor R9 is connected between the 1 port and the 2 port of the optical coupler U1; the drain of the MOS tube Q1 is connected to the anode of the diode D1 through a resistor R1, the source of the MOS tube Q1 is connected to the anode of the diode D4 through a resistor R3 and a resistor R5, the source of the MOS tube Q1 is further connected to the BMS system power supply end, and the base of the MOS tube Q1 is connected to the resistor R5; the cathode of the diode D1 is connected to the processor in the BMS system; the cathode of the diode D4 is connected to the 3 port of the optical coupler U1; and the 4 port of the optical coupler U1 is grounded.

[0027] When the charging wake-up circuit detects that there is a voltage between the positive pole end and the negative pole end of the charging, a high-level signal is output to the wake-up BMS processor MCU, so as to wake up the BMS processor MCU.

[0028] In a second aspect, the application provides a circuit protection board, the circuit Protecting board Applications such as The BMS power supply control system in the first aspect.

[0029] In summary, the application provides a BMS power supply control system, which mainly consists of the following parts: a BMS controller, a first switch, a second switch, a DC / DC module, a main power supply circuit, a switching circuit, a backup battery and a charging wake-up circuit. The BMS controller can send control signals to the first switch and the second switch. One end of the first switch is connected to the positive pole of the battery pack, and one end of the second switch is connected to the positive pole of the charging port. The output ends of the first switch and the second switch are both connected to the DC / DC module. The DC / DC module is connected to the main power supply circuit. The main power supply circuit supplies power to the BMS system through the switching circuit, and the switching circuit is also connected to the backup battery. The backup battery provides a backup power supply when the system is working normally. When the BMS system is in a sleep state, the charging wake-up circuit can wake up the BMS system, so as to ensure that the system can resume work at any time.

[0030] Compared with the prior art, the application has at least the following beneficial effects:

[0031] The application can flexibly switch multiple power supply modes to effectively protect the battery cell and prolong the service life of the battery cell. The DC / DC module, the main power supply circuit, the switching circuit, the backup battery and the charging wake-up circuit; BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 The BMS power supply control system structure diagram shown in the embodiment of the application.

[0033] Figure 2is a first switch circuit diagram shown in the embodiment of the present application.

[0034] Figure 3 is a first switch circuit diagram shown in the embodiment of the present application.

[0035] Figure 4 is a DC / DC module circuit diagram shown in the embodiment of the present application.

[0036] Figure 5 is a main power supply circuit diagram shown in the embodiment of the present application.

[0037] Figure 6 is a switching circuit diagram shown in the embodiment of the present application.

[0038] Figure 7 is a charging wake-up circuit diagram shown in the embodiment of the present application.

[0039] Figure 8 is a BMS power supply flow chart shown in the embodiment of the present application. DETAILED DESCRIPTION

[0040] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0041] Embodiment one:

[0042] As shown in the accompanying drawings, Figure 1 the present application proposes a BMS power supply control system, characterized in that the BMS power supply control system comprises a BMS controller, a first switch, a second switch, a DC / DC module, a main power supply circuit, a switching circuit, a backup battery and a charging wake-up circuit.

[0043] The BMS controller can send a first control signal to the first switch, and the BMS controller can also send a second control signal to the second switch.

[0044] The first switch input end is connected to the positive pole of the battery pack of the BMS system, and the second switch is connected to the positive pole of the charging port of the BMS system, the first switch output end and the second switch output end are connected to the DC / DC module; the DC / DC module is connected to the main power supply circuit; the main power supply circuit is connected to the switching circuit; the backup battery is also connected to the switching circuit; the switching circuit supplies power to the entire BMS system; the charging wake-up circuit is used to wake up the BMS system when the BMS system is in a dormant state.

[0045] Through the cooperation of the first switch and the second switch, the system can switch the power supply mode between different working states. This flexibility can choose the most suitable power supply mode according to different needs, thereby ensuring the stability and high efficiency of the BMS system under various working conditions.

[0046] Through reasonable power switching strategy, the battery can be prevented from working under unnecessary high load, effectively reducing battery loss and reducing battery decay rate, thereby prolonging the service life of the battery.

[0047] Ensure continuous power supply: the combination of the switching circuit and the backup battery enables the backup battery to continue to provide power for the BMS system when the main power fails or the system is in a sleep state, avoiding the loss of system function at critical moments and improving the reliability of the system.

[0048] The charging wake-up circuit can wake up the system in time when the BMS system enters the sleep state, ensuring that the system can resume normal work when needed, and improving the intelligent management and automation level of the system.

[0049] In the embodiment of the utility model, optional, as shown in the figure, the first switch includes: Figure 2

[0050] The base of MOS tube Q3 is connected with the BMS controller through resistor R10, the source of MOS tube Q3 is grounded, and the drain of MOS tube Q3 is connected with the anode of diode D5;The cathode of diode D5 is connected with the first DC power supply;The first switch optocoupler is connected with diode D5 in parallel, the input end of the first switch optocoupler is connected with the positive pole of the charging port, and the output end of the first switch optocoupler is connected with the DC / DC module.

[0051] In the embodiment of the utility model, when the BMS controller output signal makes MOS tube Q3 conduct, current flows to the first DC power supply through diode D5, and the subsequent circuit is powered. At this time, the working state of the optocoupler is controlled by the voltage signal of the charging port, and the working of the DC / DC module is further adjusted. The optocoupler provides electrical isolation, ensuring that the charging port signal does not directly affect other parts of the circuit.

[0052] Through this cooperation, the whole circuit can control the start and stop of the DC / DC module when the charging voltage comes, thereby realizing efficient management of the power supply and circuit protection

[0053] In the embodiment of the utility model, optional, as shown in the figure, the second switch includes: Figure 3

[0054] ​​The base of the MOS tube Q4 is connected with the BMS controller through the resistor R11, the source of the MOS tube Q4 is grounded, and the drain of the MOS tube Q4 is connected with the anode of the diode D6; the cathode of the diode D6 is connected with the second direct current power supply; the second switch optocoupler is connected with the diode D6 in parallel, the input end of the second switch optocoupler is connected with the positive pole of the charging port, and the output end of the second switch optocoupler is connected with the DC / DC module.

[0055] In the embodiment of the utility model, when the BMS controller output signal makes the MOS tube Q4 conduct, the current flows to the first direct current power supply through the diode D6, and the subsequent circuit is powered. At this time, the working state of the optocoupler is controlled by the voltage signal of the charging port, and the working of the DC / DC module is further adjusted. The optocoupler provides electrical isolation, and ensures that the charging port signal does not directly affect other parts of the circuit.

[0056] In the embodiment of the utility model, optionally, as shown in the accompanying drawings, Figure 4 The DC / DC module comprises a DC-DC chip, the DC-DC chip comprises a Vi+ port, a Vi- port, a +Vo port and a 0V port, the Vi+ port is connected with the first switch and the second switch, the Vi- port is connected with the negative pole of the charging port, the +Vo port is connected with the main power supply circuit, and the 0V port is grounded.

[0057] In the embodiment of the utility model, optionally, the chip used by the DC-DC chip is PV40-27B12, which is a gold upgrade switch power module, and high-voltage direct current is converted into isolated low-voltage 12V, but is not limited to this.

[0058] The DC / DC chip converts the input voltage (controlled by the first switch and the second switch) into a stable output voltage, and provides the input voltage through the Vi+ and Vi- ports, and provides the output voltage for the main power supply circuit through the +Vo and 0V ports. The functions of the first switch and the second switch are to control whether the voltage can enter the DC / DC module, so as to realize power management. In this way, the DC / DC module can effectively provide the required stable power supply for the system.

[0059] In the embodiment of the utility model, optionally, as shown in the accompanying drawings, Figure 5 The main power supply circuit comprises a buck chip, the buck chip comprises a Vin port and a Vout port, the Vin port is connected with the DC / DC module, and the Vout port is connected with the switching circuit.

[0060] In the embodiment of the utility model, optionally, the main power circuit further includes: one end of capacitor C3 is connected with the Vin port, and the other end is grounded. One end of capacitor C4 is connected with the DC / DC module, and the other end is grounded. One end of capacitor C2 is connected with the Vout port, and the other end is grounded. One end of capacitor C1 is connected with the switching circuit, and the other end is grounded.

[0061] The DC / DC module converts the input voltage into a voltage suitable for the buck chip and delivers it to the Vin port.

[0062] The buck chip reduces the voltage to the required low voltage through buck conversion according to the input voltage and outputs a stable voltage through the Vout port.

[0063] Capacitors C3 and C4 are used to smooth and filter the input voltage, reducing noise and fluctuations.

[0064] Capacitors C2 and C1 are used to smooth and filter the output voltage to ensure that the switching circuit can receive a stable power supply voltage.

[0065] In the embodiment of the utility model, optionally, as shown in the accompanying Figure 6 The switching circuit includes:

[0066] The drain of MOS tube Q2 is connected to the BMS system power supply end, the base of MOS tube Q2 is connected to the main power circuit and the anode of diode D3, and is also grounded through resistor R6, and the source of MOS tube Q2 is connected to the cathode of diode D2; the anode of diode D2 is connected to the backup battery; and the cathode of diode D3 is connected to the BMS system power supply end.

[0067] The switching circuit realizes power switching between the main power supply and the backup battery through the control of MOS tube Q2 and the unidirectional conduction characteristics of diodes D2 and D3. When MOS tube Q2 is turned on, the power supply comes from the main power supply; when MOS tube Q2 is turned off, the backup battery is switched to power supply, ensuring that the BMS system can always obtain stable power supply.

[0068] In the embodiment of the utility model, the backup battery is an ER34615 lithium sub-battery with a rated voltage of 3.6V and a rated capacity of 19Ah, which provides power supply when the BMS is in ultra-low power consumption operation. The communication terminal J1 is input to the switching circuit, but is not limited thereto.

[0069] In the embodiment of the utility model, optionally, as shown in the accompanying Figure 7As shown, the charging wake-up circuit further comprises: the 1 port of the optocoupler U1 is connected with the positive pole of the charging port through a plurality of resistors, the 2 port of the optocoupler U1 is connected with the negative pole of the charging port, and a resistor R9 is connected between the 1 port and the 2 port of the optocoupler U1; the drain of the MOS tube Q1 is connected with the anode of the diode D1 through a resistor R1, the source of the MOS tube Q1 is connected with the anode of the diode D4 through a resistor R3 and a resistor R5, the source of the MOS tube Q1 is further connected with the BMS system power supply end, and the base of the MOS tube Q1 is connected with the resistor R5; the cathode of the diode D1 is connected with a processor in the BMS system; the cathode of the diode D4 is connected with the 3 port of the optocoupler U1; and the 4 port of the optocoupler U1 is grounded.

[0070] When the voltage between P+ and P- is detected, the optocoupler U1 is turned on, a high level signal is output to the PA0 pin of the MCU, so that the MCU is woken up. The process is mainly to realize the isolation and transmission of the voltage signal through the optocoupler U1. When the voltage between P+ and P- is detected, the optocoupler U1 is turned on, and a high level signal is generated at the output end of the optocoupler. The high level signal is transmitted through the PA0 pin of the MCU, so as to trigger the wake-up of the MCU.

[0071] In the embodiment of the utility model, optionally, as shown in the accompanying drawings, Figure 8 As shown in the BMS power supply flow chart shown in the embodiment of the utility model. Specifically as follows:

[0072] When the charger is connected, the BMS is woken up, at this time, the external power supply is switched, and it is judged whether there is no external connection, if yes, the internal power supply is switched, if not, the external power supply is continued. During internal power supply, it is continuously judged whether there is no charging for a long time, if yes, the internal power supply is disconnected, the BMS is in sleep state, if not, the internal power supply is continued.

[0073] Embodiment two:

[0074] The application provides a circuit protection plate, characterized in that the circuit Protecting The circuit protection plate applies the BMS power supply control system as shown in the embodiment 1.

[0075] In summary, the application provides a BMS power supply control system, mainly composed of the following parts: BMS controller, first switch, second switch, DC / DC module, main power supply circuit, switching circuit, backup battery and charging wake-up circuit. The BMS controller can send control signals to the first switch and also to the second switch. One end of the first switch is connected to the positive pole of the battery pack, and one end of the second switch is connected to the positive pole of the charging port. The output terminals of the first switch and the second switch are both connected to the DC / DC module. The DC / DC module is connected to the main power supply circuit. The main power supply circuit supplies power to the BMS system through the switching circuit, and the switching circuit is also connected to the backup battery. The backup battery provides backup power when the system is working normally. When the BMS system is in a dormant state, the charging wake-up circuit can wake up the BMS system to ensure that the system can resume work at any time.

[0076] The application can flexibly switch between multiple power supply modes to effectively protect the battery cells and prolong the service life of the battery cells.

[0077] In several embodiments provided by the application, it can be understood that each block in the flowchart or block diagram can represent a module, a program segment or a part of code, which includes one or more executable instructions for implementing a specified logic function. It should also be noted that in some alternative implementation manners, the functions marked in the blocks can also occur in an order different from that marked in the figure. For example, two consecutive blocks can actually be executed substantially in parallel, and sometimes they can be executed in reverse order, depending on the functions involved.

[0078] If the functions are implemented in the form of software function modules and sold or used as independent products, they can be stored in a computer readable storage medium. Based on this understanding, the technical solutions of the application can be embodied in the form of a software product, which is stored in a storage medium and includes a number of instructions for causing an electronic device to execute all or part of the steps of the methods described in the various embodiments of the application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), magnetic disk or optical disk and various program code storage media.

[0079] The above-described specific embodiments, purposes, technical solutions and beneficial effects of the present application are further described in detail, and it should be understood that the above-described is only a specific embodiment of the present application and is not used to limit the protection scope of the present application. It is particularly pointed out that for those skilled in the art, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A BMS power supply control system, characterized by, The BMS power supply control system comprises a BMS controller, a first switch, a second switch, a DC / DC module, a main power supply circuit, a switching circuit, a backup battery and a charging wake-up circuit. The BMS controller can send a first control signal to the first switch, and can also send a second control signal to the second switch. The first switch input end is connected to the positive pole of the battery pack of the BMS system, and the second switch is connected to the positive pole of the charging port of the BMS system, the first switch output end and the second switch output end are connected to the DC / DC module, the DC / DC module is connected to the main power supply circuit, the main power supply circuit is connected to the switching circuit, the backup battery is also connected to the switching circuit, the switching circuit supplies power to the entire BMS system, and the charging wake-up circuit is used to wake up the BMS system when the BMS system is in a dormant state.

2. The BMS power supply control system of claim 1, wherein, The first switch comprises: The MOS tube Q3 base is connected to the BMS controller through the resistor R10, the MOS tube Q3 source is grounded, the MOS tube Q3 drain is connected to the anode of the diode D5, the cathode of the diode D5 is connected to the first DC power supply, the first switch optocoupler is connected in parallel with the diode D5, the input end of the first switch optocoupler is connected to the positive pole of the charging port, and the output end of the first switch optocoupler is connected to the DC / DC module.

3. The BMS power supply control system of claim 2, wherein, The second switch comprises: The MOS tube Q4 base is connected to the BMS controller through the resistor R11, the MOS tube Q4 source is grounded, the MOS tube Q4 drain is connected to the anode of the diode D6, the cathode of the diode D6 is connected to the second DC power supply, the second switch optocoupler is connected in parallel with the diode D6, the input end of the second switch optocoupler is connected to the positive pole of the charging port, and the output end of the second switch optocoupler is connected to the DC / DC module.

4. The BMS power supply control system of claim 3, wherein, The DC / DC module comprises a DC-DC chip, the DC-DC chip comprises a Vi+ port, a Vi- port, a +Vo port and a 0V port, the Vi+ port is connected to the first switch and the second switch, the Vi- port is connected to the negative pole of the charging port, the +Vo port is connected to the main power supply circuit, and the 0V port is grounded.

5. The BMS power supply control system of claim 4, wherein, The main power supply circuit comprises a buck chip, the buck chip comprises a Vin port and a Vout port, the Vin port is connected to the DC / DC module, and the Vout port is connected to the switching circuit.

6. The BMS power supply control system of claim 5, wherein, The switching circuit comprises: The MOS tube Q2 drain is connected to the BMS system power supply end, the MOS tube Q2 base is connected to the main power supply circuit and the anode of the diode D3, and is also grounded through the resistor R6, the MOS tube Q2 source is connected to the cathode of the diode D2, the anode of the diode D2 is connected to the backup battery, and the cathode of the diode D3 is connected to the BMS system power supply end.

7. The BMS power supply control system of claim 6, wherein, The charging wake-up circuit further comprises: the 1 port of the photoelectric coupler U1 is connected to the positive pole of the charging port through a plurality of resistors, the 2 port of the photoelectric coupler U1 is connected to the negative pole of the charging port, and a resistor R9 is connected between the 1 port and the 2 port of the photoelectric coupler U1; the drain of the MOS tube Q1 is connected to the anode of the diode D1 through a resistor R1, the source of the MOS tube Q1 is connected to the anode of the diode D4 through a resistor R3 and a resistor R5, and the source of the MOS tube Q1 is further connected to the BMS system power supply end, the base of the MOS tube Q1 is connected to the resistor R5; the cathode of the diode D1 is connected to a processor in the BMS system; the cathode of the diode D4 is connected to the 3 port of the photoelectric coupler U1; and the 4 port of the photoelectric coupler U1 is grounded.

8. A circuit protection board, characterized by The circuit protection board applies the BMS power supply control system as claimed in claims 1-7.

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