Protection board circuit for lithium battery BMS (Battery Management System)

Abstract

The utility model discloses a protection board circuit for a lithium battery BMS, which belongs to the technical field of analog circuits and comprises a power MOS module circuit, a main control chip U1 circuit, a short-circuit protection circuit, an anti-overvoltage protection circuit, a main control MCU control circuit and a signal isolation control circuit. Wherein the power MOS module circuit, the short-circuit protection circuit and the anti-overvoltage protection circuit are electrically connected with the main control chip U1 circuit, the main control MCU control circuit is electrically connected with the signal isolation control circuit, and the main control MCU control circuit, the signal isolation control circuit and the main control chip U1 circuit are electrically connected through an IIC serial port; and the circuit of the main control chip U1 is an SH367309 chip. The battery management system can be widely applied to a management system of 5-16 strings of batteries, is mainly designed based on a domestic chip, can enhance autonomy in the coverage field, and avoids technical risks, purchasing risks and the like caused by using foreign components.

Description

Technical Field

[0001] The utility model belongs to the technical field of analog circuits, and in particular relates to a protection board circuit for a lithium battery BMS. Background Art

[0002] In recent years, with the rapid development of lithium-ion batteries, the protection board for lithium battery BMS has also developed rapidly. With the continuous advancement of technology, people have higher and higher requirements for its safety and stability. At present, the protection board circuit for lithium battery BMS is mainly developed and designed based on foreign chips. Although these foreign chip software can meet the working needs of lithium battery BMS, with the rapid development of domestic chips, it is particularly important to design a matching protection board circuit for lithium battery BMS. Utility Model Content

[0003] The utility model provides a protection board circuit for a lithium battery BMS to solve the technical problems existing in the known technology, and can apply domestic chips to the lithium battery BMS.

[0004] The utility model aims to provide a protection board circuit for a lithium battery BMS, comprising a power MOS module circuit, a main control chip U1 circuit, a short circuit protection circuit, an overvoltage protection circuit, a main control MCU control circuit and a signal isolation control circuit; wherein: the power MOS module circuit, the short circuit protection circuit and the overvoltage protection circuit are all electrically connected to the main control chip U1 circuit, the main control MCU control circuit is electrically connected to the signal isolation control circuit, and the main control MCU control circuit, the signal isolation control circuit and the main control chip U1 circuit are electrically connected via an IIC serial port.

[0005] Preferably, the power MOS module circuit is electrically connected to the main control chip U1 circuit through DSG and CHG interfaces and B- and P- through resistors, diodes and transistors.

[0006] Preferably, the power MOS module circuit includes MOS tube No. 1, MOS tube No. 2, MOS tube No. 3, MOS tube No. 4, capacitor No. 32, capacitor No. 33, resistor No. 57, resistor No. 60, resistor No. 62, resistor No. 65, resistor No. 67, resistor No. 68, resistor No. 69, resistor No. 70, resistor No. 72, resistor No. 76, diode No. 4, diode No. 5, diode No. 8, and MOS tube No. 15. The resistor No. 65 is electrically connected to the 34th pin of the main control chip U1 circuit, and the resistor No. 57 and MOS tube are electrically connected to the 36th pin of the main control chip U1 circuit.

[0007] Preferably, the main control chip U1 circuit includes a protection chip circuit, a balancing circuit, an overcurrent protection circuit, and a temperature sampling circuit.

[0008] Preferably, the protection chip circuit includes a main control chip, resistor No. 14, resistor No. 17, resistor No. 19, resistor No. 20, resistor No. 27, resistor No. 29, resistor No. 32, capacitor No. 8, capacitor No. 11, capacitor No. 13, capacitor No. 14, capacitor No. 15, diode No. 2, and diode No. 3. Resistor No. 29 is electrically connected to pins 37 and 38 of the main control chip U1 circuit, resistor No. 23 is electrically connected to pin 44 of the main control chip U1 circuit, resistor No. 14 and resistor No. 17 are electrically connected to pin 45 of the main control chip U1 circuit, resistor No. 20 is electrically connected to pins 43 and 46 of the main control chip U1 circuit, capacitor No. 11 and resistor No. 27 are electrically connected to the main control chip U1 circuit The 48th pin is electrically connected to the balancing circuit, and the balancing circuit includes resistor No. 1, resistor No. 2, resistor No. 3, resistor No. 4, resistor No. 5, resistor No. 6, resistor No. 7, resistor No. 8, resistor No. 9, resistor No. 10, resistor No. 11, resistor No. 12, resistor No. 13, resistor No. 15, resistor No. 16, resistor No. 17, resistor No. 18, resistor No. 21, resistor No. 22, resistor No. 23, resistor No. 24, resistor No. 25, resistor No. 26, resistor No. 28, resistor No. 30, resistor No. 33, resistor No. 34, resistor No. 35, resistor No. 36, resistor No. 37, resistor No. 38, resistor No. 42, resistor No. 43, resistor No. 44, resistor No. 47, resistor No. 48, Resistor No. 49, Resistor No. 50, Resistor No. 51, Resistor No. 52, Resistor No. 53, Resistor No. 54, Resistor No. 55, Resistor No. 56, Resistor No. 58, Resistor No. 59, Resistor No. 61, Resistor No. 63, Resistor No. 64, Resistor No. 66, Resistor No. 71, Resistor No. 73, Resistor No. 78, Capacitor No. 3, Capacitor No. 4, Capacitor No. 5, Capacitor No. 6, Capacitor No. 7, Capacitor No. 9, Capacitor No. 10, Capacitor No. 12, Capacitor No. 17, Capacitor No. 18, Capacitor No. 23, Capacitor No. 26, Capacitor No. 27, Capacitor No. 28, Capacitor No. 29, Capacitor No. 30, Capacitor No. 31, Diode No. 6, Diode No. 7, Transistor No. 1, Transistor No. 2 , transistor No. 3, transistor No. 4, transistor No. 5, transistor No. 6, transistor No. 7, transistor No. 8, transistor No. 9, transistor No. 10, transistor No. 11, transistor No. 12, transistor No. 13, transistor No. 14, transistor No. 16, transistor No. 17, the resistor No. 2, resistor No. 4, resistor No. 5, capacitor No. 3 are electrically connected to the first pin of the main control chip U1 circuit, the resistor No. 4, resistor No. 5, capacitor No. 3, capacitor No. 4 are electrically connected to the second pin of the main control chip U1 circuit, the resistor No. 7, resistor No. 8, capacitor No. 4, capacitor No. 5 are electrically connected to the third pin of the main control chip U1 circuit, the resistor No. 10, resistor No. 11, capacitor No. 5, capacitor No. 6 are electrically connected to the fourth pin of the main control chip U1 circuit,Resistor No. 13, resistor No. 15, capacitor No. 6, and capacitor No. 7 are electrically connected to pin 5 of the main control chip U1 circuit. Resistor No. 18, resistor No. 21, capacitor No. 7, and capacitor No. 9 are electrically connected to pin 6 of the main control chip U1 circuit. Resistor No. 24, resistor No. 25, capacitor No. 9, and capacitor No. 10 are electrically connected to pin 7 of the main control chip U1 circuit. Resistor No. 28, resistor No. 30, capacitor No. 10, and capacitor No. 12 are electrically connected to pin 8 of the main control chip U1 circuit. Resistor No. 33, resistor No. 34, capacitor No. 12, and capacitor No. 17 are electrically connected to pin 9 of the main control chip U1. Resistor No. 36, resistor No. 37, and capacitor No. 17 are electrically connected to pin 10 of the main control chip U1 circuit. Capacitor No. 1 and capacitor No. 18 are electrically connected to pin 10 of the main control chip U1 circuit, resistor No. 43, resistor No. 44, capacitor No. 18 and capacitor No. 23 are electrically connected to pin 11 of the main control chip U1 circuit, resistor No. 47, resistor No. 48, capacitor No. 23 and capacitor No. 26 are electrically connected to pin 12 of the main control chip U1 circuit, resistor No. 50, resistor No. 51, capacitor No. 26 and capacitor No. 27 are electrically connected to pin 13 of the main control chip U1 circuit, resistor No. 53, resistor No. 54, capacitor No. 27 and capacitor No. 28 are electrically connected to pin 14 of the main control chip U1 circuit, resistor No. 56, resistor No. 57, capacitor No. 58 are electrically connected to pin 15 of the main control chip U1 circuit. Resistor No. 18, capacitor No. 28, and capacitor No. 29 are electrically connected to pin 15 of the main control chip U1 circuit, resistor No. 60, resistor No. 61, capacitor No. 29, capacitor No. 30, and diode No. 6 are electrically connected to pin 16 of the main control chip U1 circuit, resistor No. 66, resistor No. 71, capacitor No. 30, capacitor No. 31, and diode No. 6 are electrically connected to pin 17 of the main control chip U1 circuit, and the overcurrent protection circuit includes current sensing resistor No. 75, current sensing resistor No. 77, resistor No. 45, resistor No. 46, capacitor No. 22, capacitor No. 24, and capacitor No. 25, and the resistor No. 45, capacitor No. 22, Capacitor No. 24 is electrically connected to the 18th pin of the main control chip U1 circuit, resistor No. 46, capacitor No. 22, and capacitor No. 25 are electrically connected to the 19th pin of the main control chip U1 circuit, and the temperature sampling circuit includes thermistor No. 39, thermistor No. 40, resistor No. 41, capacitor No. 19, capacitor No. 20, and capacitor No. 21. Thermistor No. 39 and capacitor No. 19 are electrically connected to the 20th pin of the main control chip U1 circuit, thermistor No. 40 and capacitor No. 20 are electrically connected to the 21st pin of the main control chip U1 circuit, and thermistor No. 41 and capacitor No. 21 are electrically connected to the 22nd pin of the main control chip U1 circuit.

[0009] Preferably, the short-circuit protection circuit includes fuse No. 1, fuse No. 2, and resistor No. 74, and resistor No. 74 is electrically connected to pin 42 of the main control chip U1 circuit, and fuse No. 1, fuse No. 2, and resistor No. 74 are electrically connected to P- / C-.

[0010] Preferably, the overvoltage protection circuit includes a No. 1 capacitor, a No. 2 capacitor, and a No. 1 fast recovery diode. The No. 1 capacitor and the No. 1 fast recovery diode are electrically connected to P+ / C+ and B+, and the No. 2 capacitor and the No. 1 fast recovery diode are electrically connected to P- / C-.

[0011] Preferably, the main control MCU control circuit includes a power display control circuit, a low power control circuit, a single-chip peripheral circuit, and an interface circuit. The power display control circuit includes a No. 7 light-emitting diode, a No. 8 light-emitting diode, a No. 9 light-emitting diode, a No. 10 light-emitting diode, a No. 11 light-emitting diode, a No. 32 resistor, a No. 33 resistor, a No. 34 resistor, a No. 35 resistor, and a No. 36 resistor. The No. 36 resistor is electrically connected to the 12th pin of the single-chip chip, the No. 35 resistor is electrically connected to the 13th pin of the single-chip chip, the No. 34 resistor is electrically connected to the 14th pin of the single-chip chip, the No. 33 resistor is electrically connected to the 15th pin of the single-chip chip, the No. 32 resistor is electrically connected to the 16th pin of the single-chip chip, and the No. 36 resistor is electrically connected to the 12th pin of the single-chip chip. Resistor No. 12 is electrically connected to LED No. 7, resistor No. 33 is electrically connected to LED No. 8, resistor No. 34 is electrically connected to LED No. 9, resistor No. 35 is electrically connected to LED No. 10, and resistor No. 36 is electrically connected to LED No. 11, and then electrically connected to GND. The low-power control circuit includes Bluetooth, transistor No. 1, MOS tube No. 2, MOS tube No. 3, resistor No. 37, resistor No. 38, resistor No. 39, resistor No. 40, resistor No. 41, resistor No. 42, resistor No. 43, capacitor No. 17, and capacitor No. 18. Resistor No. 38 and MOS tube No. 2 are electrically connected to pin 2 of Bluetooth, resistor No. 39 and MOS tube No. 3 are electrically connected to pin 3 of Bluetooth, and resistor No. 37 and No. 1 are electrically connected to pin 3 of Bluetooth. The transistor is electrically connected to the 5th pin of Bluetooth, the No. 1 transistor, the No. 2 MOS tube, the No. 3 MOS tube, the No. 37 resistor, the No. 38 resistor, the No. 39 resistor, the No. 40 resistor, the No. 17 capacitor, and the No. 18 capacitor are electrically connected to the 3rd pin of the memory, the No. 42 resistor is electrically connected to the 20th pin of the single-chip chip U3, the No. 43 resistor is electrically connected to the 21st pin of the single-chip chip, the No. 41 resistor is electrically connected to the 27th pin of the single-chip chip, the 1st pin of Bluetooth and the 6th pin of Bluetooth are electrically connected to GND, and the single-chip peripheral circuit includes the single-chip chip, the No. 2 crystal oscillator, the memory, the No. 2 switch, the No. 26 resistor, the No. 27 resistor, the No. 28 resistor, the No. 29 resistor, the No. 10 capacitor, the No. 13 capacitor, and the No. 14 capacitor. Capacitor No. 15 and capacitor No. 16 are electrically connected to pin 4 of the single-chip microcomputer chip, crystal oscillator No. 2 and capacitor No. 14 are electrically connected to pin 5 of the single-chip microcomputer chip, resistor No. 26 is electrically connected to pin 26 of the single-chip microcomputer chip 3, capacitor No. 16 is electrically connected to switch No. 2 and resistor No. 26, resistor No. 26, resistor No. 27 and resistor No. 28 are electrically connected to pin 3 of the memory, resistor No. 27 is electrically connected to pin 23 of the single-chip microcomputer chip, resistor No. 28 is electrically connected to pin 22 of the single-chip microcomputer chip, resistor No. 29 is electrically connected to pin 18 of the single-chip microcomputer chip, capacitor No. 13 is electrically connected to pin 3 of the single-chip microcomputer chip, capacitor No. 15 is electrically connected to pin 6 and pin 7 of the single-chip microcomputer chip,The interface circuit includes a two-way connector, a No. 4 connector, a No. 5 connector, a No. 6 connector, a No. 7 connector, a No. 8 connector, a No. 9 connector, a No. 30 resistor, a No. 31 resistor, and a No. 6 transistor. The No. 30 resistor is electrically connected to the No. 6 transistor and the 21st pin of the single-chip chip, the No. 31 resistor is electrically connected to the No. 6 transistor and the 20th pin of the single-chip chip, the No. 1 pin of the two-way connector, the No. 6 pin of the No. 8 connector and the No. 3 pin of the memory are electrically connected, and the No. 2 pin of the two-way connector is electrically connected to the No. 1 pin of the single-chip chip. Pin 1 is electrically connected, pin 4 of the two-way connector is electrically connected to pin 32 of the microcontroller chip, pin 6 of the two-way connector is electrically connected to pin 31 of the microcontroller chip, pin 8 of the two-way connector is electrically connected to pin 30 of the microcontroller chip, pin 2 of the No. 8 connector is electrically connected to pin 8 of the microcontroller chip, pin 2 of the No. 9 connector is electrically connected to pin 23 of the microcontroller chip, pin 3 of the No. 9 connector is electrically connected to pin 22 of the microcontroller chip, and pin 4 of the No. 9 connector is electrically connected to pin 18 of the microcontroller chip.

[0012] Preferably, the signal isolation control circuit includes a communication isolation circuit, a programming voltage control circuit, a single-chip peripheral circuit, and an interface circuit. The communication isolation circuit includes an isolation chip, a No. 20 resistor, a No. 21 resistor, a No. 23 resistor, a No. 7 capacitor, a No. 8 capacitor, and a No. 4 diode. The No. 7 capacitor is electrically connected to the No. 1 and No. 2 pins of the isolation chip, the No. 8 capacitor is electrically connected to the No. 4 diode, the No. 21 resistor, and the No. 3 and No. 8 pins of the isolation chip, the No. 20 resistor and the No. 23 resistor are electrically connected to the No. 10 pin of the isolation chip, and the No. 14 pin of the isolation chip is electrically connected to the No. 19 pin of the isolation chip. The programming voltage control circuit includes a No. 1 resistor, a No. 2 resistor, a No. 3 resistor, a No. 4 resistor, a No. 5 resistor, and a No. 6 resistor. No. 1 resistor, No. 1 capacitor, No. 1 triode, No. 1 MOS tube, No. 2 MOS tube, No. 1 diode, the No. 1 resistor is electrically connected to the No. 1 MOS tube, No. 2 MOS tube, No. 1 triode, the No. 2 resistor is electrically connected to the No. 1 capacitor, No. 1 triode, No. 2 diode, the No. 3 resistor is electrically connected to the No. 6 resistor, No. 1 triode, No. 1 MOS tube, the No. 4 resistor, No. 5 resistor, No. 2 MOS tube and the 8th pin of the isolation chip, the peripheral circuit of the single-chip computer includes a No. 1 crystal oscillator, a No. 1 switch, a No. 2 triode, a No. 3 diode, a No. 5 diode, a No. 7 resistor, a No. 8 resistor, a No. 9 resistor, a No. 10 resistor, a No. 11 resistor, a No. 12 resistor, a No. 18 resistor, a No. 19 resistor, a No. 22 Resistor, resistor No. 24, resistor No. 25, capacitor No. 2, capacitor No. 3, capacitor No. 4, capacitor No. 5, capacitor No. 9, capacitor No. 11, capacitor No. 12, indicator light, voltage regulator No. 1, the diode No. 3 is electrically connected to resistor No. 22, the first pin of the voltage regulator No. 1 is electrically connected to resistor No. 22, resistor No. 25, and capacitor No. 12, the second pin of the voltage regulator No. 1 is electrically connected to capacitor No. 11 and the second pin of the voltage regulator No. 1, the first pin of the No. 2 transistor is electrically connected to resistor No. 11 and pin 21 of the single-chip computer, the second pin of the No. 2 transistor is electrically connected to resistor No. 12 and pin 20 of the single-chip computer, the third pin of the indicator light is electrically connected to resistor No. 19, the fourth pin of the indicator light is electrically connected to resistor No. 18, and the The resistor is electrically connected to the 12th pin of the single-chip microcomputer, the 19th resistor is electrically connected to the 13th pin of the single-chip microcomputer, the 5th diode is electrically connected to the 24th resistor and the 9th capacitor, the 1st crystal oscillator and the 2nd capacitor are electrically connected to the 4th pin of the single-chip microcomputer chip, the 1st crystal oscillator and the 4th capacitor are electrically connected to the 5th pin of the single-chip microcomputer chip, the 7th resistor is electrically connected to the 26th pin of the single-chip microcomputer chip, the 6th capacitor is electrically connected to the 1st switch and the 7th resistor, the 8th resistor is electrically connected to the 23rd pin of the single-chip microcomputer chip, the 9th resistor is electrically connected to the 22nd pin of the single-chip microcomputer chip, the 10th resistor is electrically connected to the 18th pin of the single-chip microcomputer chip, the 3rd capacitor is electrically connected to the 3rd pin of the single-chip microcomputer chip, and the 5th capacitor is electrically connected to the 6th and 7th pins of the single-chip microcomputer chip.The interface circuit includes a connector No. 1, a connector No. 1, a first connector, a second connector, a third connector, a resistor No. 13, a resistor No. 14, a resistor No. 15, a resistor No. 16, and a resistor No. 17. The first pin of the connector No. 1 is electrically connected to the third pin of the voltage regulator No. 1, the second pin of the connector No. 1 is electrically connected to the first pin of the single-chip chip, the third pin of the connector No. 1 is electrically connected to the 32nd pin of the single-chip chip, the fourth pin of the connector No. 1 is electrically connected to the 31st pin of the single-chip chip, the fifth pin of the connector No. 1 is electrically connected to the 30th pin of the single-chip chip, the thirteenth resistor is electrically connected to the fourth pin of the second connector and the 23rd pin of the single-chip chip, the fourteenth resistor is electrically connected to the third pin of the second connector and the 22nd pin of the single-chip chip, the sixteenth resistor is electrically connected to the first pin of the second connector and the 18th pin of the single-chip chip, the fifteenth resistor is electrically connected to the second pin of the third connector and the 5th pin of the isolation chip, and the seventeenth resistor is electrically connected to the first pin of the third connector and the fourth pin of the isolation chip.

[0013] Preferably, the main control chip U1 circuit is a SH367309 chip.

[0014] The advantages and positive effects of the utility model are:

[0015] The utility model can be widely used in 5-16 string battery management systems. It is mainly designed based on domestic chips, can enhance autonomy in the coverage area, and avoids technical risks and procurement risks of using foreign components. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A circuit diagram of a preferred embodiment of the utility model;

[0017] Figure 2 This is a circuit diagram of the main control chip U1 circuit in the preferred embodiment of the utility model;

[0018] Figure 3 A circuit diagram of a power MOS module circuit in a preferred embodiment of the utility model;

[0019] Figure 4 A circuit diagram of a short-circuit protection circuit in a preferred embodiment of the utility model;

[0020] Figure 5 A circuit diagram of an overvoltage protection circuit in a preferred embodiment of the utility model;

[0021] Figure 6 A circuit diagram of a main control MCU control circuit in a preferred embodiment of the utility model;

[0022] Figure 7 A circuit diagram of a signal isolation control circuit in a preferred embodiment of the utility model;

[0023] Figure 8 A circuit diagram of a chip protection circuit in a preferred embodiment of the utility model;

[0024] Fig. 9 A circuit diagram of an overcurrent protection circuit in a preferred embodiment of the utility model;

[0025] Fig.10 4 is a circuit diagram of a temperature sampling circuit in a preferred embodiment of the present utility model. DETAILED DESCRIPTION

[0026] In order to make the above-mentioned purpose, design control system and advantages of the utility model more clear, the utility model is further described in detail in combination with the embodiments below. It should be understood that the specific embodiments described here are only used to explain the utility model, and are not used to limit the utility model.

[0027] like Figures 1 to 10 As shown, the technical solution of the utility model is:

[0028] A protection board circuit for a lithium battery BMS mainly includes a power MOS module circuit, a main control chip U1 circuit, a short circuit protection circuit, an overvoltage protection circuit, a main control MCU control circuit, and a signal isolation control circuit. The power MOS module circuit, the short circuit protection circuit, and the overvoltage protection circuit are all electrically connected to the main control chip U1 circuit, the main control MCU control circuit is electrically connected to the signal isolation control circuit, and the main control MCU control circuit and the signal isolation control circuit are electrically connected to the main control chip U1 circuit through an IIC serial port.

[0029] Power MOS module circuit: electrically connected to the main control chip U1 through DSG, CHG interfaces and B- and P- through resistors, diodes and transistors.

[0030] Main control chip U1 circuit: includes protection chip circuit, balancing circuit, overcurrent protection circuit, and temperature sampling circuit. The protection chip circuit is electrically connected by the protection chip and the peripheral circuit. The balancing circuit is electrically connected by 16 groups of balancing resistors, filter capacitors and transistors. 5 to 16 strings of balancing can be adjusted according to actual usage. The overcurrent protection circuit is electrically connected by shunt resistors, filter capacitors and current detection resistors. The temperature sampling circuit and the main control chip U1 are electrically connected to the protection chip through T1, T2, and T3 interfaces.

[0031] Short circuit protection circuit: The resistor is electrically connected to the two fuses C- and P-.

[0032] Anti-overvoltage protection circuit: Two capacitors and a fast recovery diode are electrically connected between C+ and P+.

[0033] Main MCU control circuit: power display control circuit, low power control circuit, single chip peripheral circuit, interface circuit are electrically connected.

[0034] Signal isolation control circuit: communication isolation circuit, programming voltage control circuit, single chip microcomputer peripheral circuit, interface circuit are electrically connected.

[0035] The power MOS module circuit includes MOS tube No. 1 V1, MOS tube No. 2 V2, MOS tube No. 3 V3, MOS tube No. 4 V4, capacitor No. 32 C32, capacitor No. 33 C33, resistor No. 57 R57, resistor No. 60 R60, resistor No. 62 R62, resistor No. 65 R65, resistor No. 67 R67, resistor No. 68 R68, resistor No. 69 R69, resistor No. 70 R70, resistor No. 72 R72, resistor No. 76 R76, diode No. 4 D4, diode No. 5 D5, diode No. 8 D8, MOS tube No. 15 T15, resistor No. 65 R65 is electrically connected to pin 34 of the main control chip U1 circuit, and resistor No. 57 R57 and MOS tube T15 are electrically connected to pin 36 of the main control chip U1 circuit.

[0036] The main control chip U1 circuit includes a protection chip circuit, a balancing circuit, an overcurrent protection circuit, and a temperature sampling circuit. The protection chip circuit includes a main control chip, a resistor No. 14 R14, a resistor No. 17 R17, a resistor No. 19 R19, a resistor No. 20 R20, a resistor No. 27 R27, a resistor No. 29 R29, a resistor No. 32 R32, a capacitor No. 8 C8, a capacitor No. 11 C11, a capacitor No. 13 C13, a capacitor No. 14 C14, a capacitor No. 15 C15, a diode No. 2 D2, and a diode No. 3 The diode D3, the 29th resistor R29 is electrically connected to the 37th and 38th pins of the main control chip U1 circuit, the 23rd resistor R23 is electrically connected to the 44th pin of the main control chip U1 circuit, the 14th resistor R14 and the 17th resistor R17 are electrically connected to the 45th pin of the main control chip U1 circuit, the 20th resistor R20 is electrically connected to the 43rd and 46th pins of the main control chip U1 circuit, the 11th capacitor C11 and the 27th resistor R27 are electrically connected to the 48th pin of the main control chip U1 circuit,The balancing circuit includes resistor No. 1 R1, resistor No. 2 R2, resistor No. 3 R3, resistor No. 4 R4, resistor No. 5 R5, resistor No. 6 R6, resistor No. 7 R7, resistor No. 8 R8, resistor No. 9 R9, resistor No. 10 R10, resistor No. 11 R11, resistor No. 12, resistor No. 13, resistor No. 15, resistor No. 16, resistor No. 17, resistor No. 18, resistor No. 21 R21, resistor No. 22, resistor No. 23, resistor No. 24, resistor No. 25, resistor No. 26, resistor No. 28, resistor No. 29, resistor No. 30, resistor No. 33, resistor No. 34, resistor No. 35, resistor No. 36 R35, resistor No. 36 R36, resistor No. 37 R37, resistor No. 38 R38, resistor No. 42 R42, resistor No. 43 R43, resistor No. 44 R44, resistor No. 47 R47, resistor No. 48 R48, resistor No. 49 R49, resistor No. 50 R50, resistor No. 51 R51, resistor No. 52 R52, resistor No. 53 R53, resistor No. 54 R54, resistor No. 55 R55, resistor No. 56 R56, resistor No. 58 R58, resistor No. 59 R59, resistor No. 61 R61, resistor No. 63 R63, resistor No. 64 R64, resistor No. 66 R66, resistor No. 71 R71, resistor No. 73, resistor No. 78 Resistor R78, capacitor No. 3 C3, capacitor No. 4 C4, capacitor No. 5 C5, capacitor No. 6 C6, capacitor No. 7 C7, capacitor No. 9 C9, capacitor No. 10 C10, capacitor No. 12 C12, capacitor No. 17 C17, capacitor No. 18 C18, capacitor No. 23 C23, capacitor No. 26 C26, capacitor No. 27 C27, capacitor No. 28 C28, capacitor No. 29 C29, capacitor No. 30 C30, capacitor No. 31 C31, diode No. 6 D6, diode No. 7 D7, transistor No. 1 T1, transistor No. 2 T2, transistor No. 3 T3, transistor No. 4 T4, transistor No. 5 T5, transistor No. 6 T6, transistor No. 7 T7, transistor No. 8 T8, transistor No. 9 T9, transistor No. 10 T1 0, transistor No. 11 T11, transistor No. 12 T12, transistor No. 13 T13, transistor No. 14 T14, transistor No. 16 T16, transistor No. 17 T17, the resistor No. 2 R2, resistor No. 4 R4, resistor No. 5 R5, capacitor No. 3 C3 are electrically connected to the first pin of the main control chip U1 circuit, the resistor No. 4 R4, resistor No. 5 R5, capacitor No. 3 C3, capacitor No. 4 C4 are electrically connected to the second pin of the main control chip U1 circuit, the resistor No. 7 R7, resistor No. 8 R8, capacitor No. 4 C4, capacitor No. 5 C5 are electrically connected to the third pin of the main control chip U1 circuit, the resistor No. 10 R10, resistor No. 11 R11, capacitor No. 5 C5, capacitor No. 6 C6 are electrically connected to the fourth pin of the main control chip U1 circuit,The thirteenth resistor R13, the fifteenth resistor R15, the sixth capacitor C6, and the seventh capacitor C7 are electrically connected to the fifth pin of the main control chip U1 circuit, the eighteenth resistor R18, the twenty-first resistor R21, the seventh capacitor C7, and the ninth capacitor C9 are electrically connected to the sixth pin of the main control chip U1 circuit, the twenty-fourth resistor R24, the twenty-fifth resistor R25, the ninth capacitor C9, and the tenth capacitor C10 are electrically connected to the seventh pin of the main control chip U1 circuit, the twenty-eighth resistor R28, the thirtieth resistor R30, the tenth capacitor C10, and the twelveth capacitor C12 are electrically connected to the eighth pin of the main control chip U1 circuit, the thirty-third resistor R33, the thirty-fourth resistor R34, the twelveth capacitor C12, and the seventeenth capacitor C17 are electrically connected to the main control chip The 9th pin of chip U1 is electrically connected, the 36th resistor R36, the 37th resistor R37, the 17th capacitor C17, and the 18th capacitor C18 are electrically connected to the 10th pin of the main control chip U1 circuit, the 43rd resistor R43, the 44th resistor R44, the 18th capacitor C18, and the 23rd capacitor C23 are electrically connected to the 11th pin of the main control chip U1 circuit, the 47th resistor R47, the 48th resistor R48, the 23rd capacitor C23, and the 26th capacitor C26 are electrically connected to the 12th pin of the main control chip U1 circuit, the 50th resistor R50, the 51st resistor R51, the 26th capacitor C26, and the 27th capacitor C27 are electrically connected to the 13th pin of the main control chip U1 circuit, and the 53rd resistor R 53, No. 54 resistor R54, No. 27 capacitor C27, No. 28 capacitor C28 are electrically connected to the 14th pin of the main control chip U1 circuit, No. 56 resistor R56, No. 58 resistor R58, No. 28 capacitor C28, No. 29 capacitor C29 are electrically connected to the 15th pin of the main control chip U1 circuit, No. 60 resistor R60, No. 61 resistor R61, No. 29 capacitor C29, No. 30 capacitor C30, No. 6 diode D6 are electrically connected to the 16th pin of the main control chip U1 circuit, No. 66 resistor R66, No. 71 resistor R71, No. 30 capacitor C30, No. 31 capacitor C31, No. 6 diode D6 are electrically connected to the 17th pin of the main control chip U1 circuit, and the overcurrent protection circuit The circuit includes a seventy-fifth current-sensing resistor R75, a seventy-seventh current-sensing resistor R77, a forty-fifth resistor R45, a forty-sixth resistor R46, a twenty-second capacitor C22, a twenty-fourth capacitor C24, and a twenty-fifth capacitor C25. The forty-fifth resistor R45, the twenty-second capacitor C22, and the twenty-fourth capacitor C24 are electrically connected to the 18th pin of the main control chip U1 circuit. The forty-sixth resistor R46, the twenty-second capacitor C22, and the twenty-fifth capacitor C25 are electrically connected to the 19th pin of the main control chip U1 circuit. The temperature sampling circuit includes a thirty-nine thermistor R39, a forty-second thermistor R40, a forty-first resistor R41, a nineteenth capacitor C19, a twenty-second capacitor C20, and a twenty-first capacitor C21.The No. 39 thermistor R39 and No. 19 capacitor C19 are electrically connected to the 20th pin of the main control chip U1 circuit, the No. 40 thermistor R40 and No. 20 capacitor C20 are electrically connected to the 21st pin of the main control chip U1 circuit, and the No. 41 thermistor R41 and No. 21 capacitor C21 are electrically connected to the 22nd pin of the main control chip U1 circuit.

[0037] The short-circuit protection circuit includes fuse No. 1 F1, fuse No. 2 F2, and resistor No. 74 R74. The resistor No. 74 R74 is electrically connected to pin 42 of the main control chip U1 circuit. The fuse No. 1 F1, fuse No. 2 F2, and resistor No. 74 R74 are electrically connected to P- / C-.

[0038] The overvoltage protection circuit includes a capacitor No. 1 C1, a capacitor No. 2 C2, and a fast recovery diode No. 1 D1. The capacitor No. 1 C1 and the fast recovery diode No. 1 D1 are electrically connected to P+ / C+ and B+, and the capacitor No. 2 C2 and the fast recovery diode No. 1 D1 are electrically connected to P- / C-.

[0039] The main control MCU control circuit includes a power display control circuit, a low power control circuit, a single-chip peripheral circuit, and an interface circuit. The power display control circuit includes a No. 7 light-emitting diode D7, a No. 8 light-emitting diode D8, a No. 9 light-emitting diode D9, a No. 10 light-emitting diode D10, a No. 11 light-emitting diode D11, a No. 32 resistor R32, a No. 33 resistor R33, a No. 34 resistor R34, a No. 35 resistor R35, and a No. 36 resistor R36. The No. 36 resistor R36 is electrically connected to the 12th pin of the single-chip chip U3, the No. 35 resistor R35 is electrically connected to the 13th pin of the single-chip chip U3, the No. 34 resistor R34 is electrically connected to the 14th pin of the single-chip chip U3, and the No. 33 resistor R33 is electrically connected to the single-chip chip U3. The 15th pin of the single-chip microcomputer chip U3 is electrically connected, the 32nd resistor R32 is electrically connected to the 16th pin of the single-chip microcomputer chip U3, the 32nd resistor R32 is electrically connected to the 7th light-emitting diode D7, the 33rd resistor R33 is electrically connected to the 8th light-emitting diode D8, the 34th resistor R34 is electrically connected to the 9th light-emitting diode D9, the 35th resistor R35 is electrically connected to the 10th light-emitting diode D10, and the 36th resistor R36 is electrically connected to the 11th light-emitting diode D11 and then electrically connected to GND. The low-power consumption control circuit includes Bluetooth CON1, a 1st transistor Q1, a 2nd MOS tube Q2, a 3rd MOS tube Q3, a 37th resistor R37, a 38th resistor R38, a 39th resistor R39, a 40th resistor R40, and a 41st resistor R41 , No. 42 resistor R42, No. 43 resistor R43, No. 17 capacitor C17, No. 18 capacitor C18, No. 38 resistor R38, No. 2 MOS tube Q2 are electrically connected to the 2nd pin of Bluetooth CON1, No. 39 resistor R39, No. 3 MOS tube Q3 are electrically connected to the 3rd pin of Bluetooth CON1, No. 37 resistor R37, No. 1 transistor Q1 are electrically connected to the 5th pin of Bluetooth CON1, No. 1 transistor Q1, No. 2 MOS tube Q2, No. 3 MOS tube Q3, No. 37 resistor R37, No. 38 resistor R38, No. 39 resistor R39, No. 40 resistor R40, No. 17 capacitor C17, No. 18 capacitor C18 are electrically connected to the 3rd pin of memory CON2, No. 42 resistor R42 is electrically connected to the single-chip microcomputer The 20th pin of the chip U3 is electrically connected, the 43rd resistor R43 is electrically connected to the 21st pin of the single-chip chip U3, the 41st resistor R41 is electrically connected to the 27th pin of the single-chip chip U3, the 1st pin of Bluetooth CON1 and the 6th pin of Bluetooth CON1 are electrically connected to GND, and the single-chip peripheral circuit includes the single-chip chip U3, the second crystal oscillator Y2, the memory CON2, the second switch K2, the 26th resistor R26, the 27th resistor R27, the 28th resistor R28, the 29th resistor R29, the 10th capacitor C10, the 13th capacitor C13, the 14th capacitor C14, the 15th capacitor C15, and the 16th capacitor C16. The second crystal oscillator Y2 and the 10th capacitor C10 are electrically connected to the 4th pin of the single-chip chip U3.The second crystal oscillator Y2 and the fourteenth capacitor C14 are electrically connected to the fifth pin of the single-chip microcomputer chip U3, the twenty-sixth resistor R26 is electrically connected to the 26th pin of the single-chip microcomputer chip U3, the sixteenth capacitor C16 is electrically connected to the second switch K2 and the twenty-sixth resistor R26, the twenty-sixth resistor R26, the twenty-seventh resistor R27, and the twenty-eighth resistor R28 are electrically connected to the third pin of the memory CON2, the twenty-seventh resistor R27 is electrically connected to the 23rd pin of the single-chip microcomputer chip U3, the twenty-eighth resistor R28 is electrically connected to the single The 22nd pin of the single-chip microcomputer chip U3 is electrically connected, the 29th resistor R29 is electrically connected to the 18th pin of the single-chip microcomputer chip U3, the 13th capacitor C13 is electrically connected to the 3rd pin of the single-chip microcomputer chip U3, the 15th capacitor C15 is electrically connected to the 6th and 7th pins of the single-chip microcomputer chip U3, and the interface circuit includes a two-way connector JP2, a four-way connector J4, a five-way connector J5, a six-way connector J6, a seven-way connector J7, a eight-way connector J8, a nine-way connector J9, a 30-way resistor R30, and a 31-way connector J14. No. 30 resistor R30 is electrically connected to the No. 6 transistor D6 and the 21st pin of the single-chip microcomputer chip U3, the No. 31 resistor R31 is electrically connected to the No. 6 transistor D6 and the 20th pin of the single-chip microcomputer chip U3, the 1st pin of the two-way connector JP2 and the 6th pin of the eight-way connector J8 are electrically connected to the 3rd pin of the memory CON2, the 2nd pin of the two-way connector JP2 is electrically connected to the 1st pin of the single-chip microcomputer chip U3, the 4th pin of the two-way connector JP2 is electrically connected to the 3rd pin of the single-chip microcomputer chip U3 2 pins are electrically connected, the 6th pin of the two-way connector JP2 is electrically connected to the 31st pin of the single-chip U3, the 8th pin of the two-way connector JP2 is electrically connected to the 30th pin of the single-chip U3, the 2nd pin of the No. 8 connector J8 is electrically connected to the 8th pin of the single-chip U3, the 2nd pin of the No. 9 connector J9 is electrically connected to the 23rd pin of the single-chip U3, the 3rd pin of the No. 9 connector J9 is electrically connected to the 22nd pin of the single-chip U3, and the 4th pin of the No. 9 connector J9 is electrically connected to the 18th pin of the single-chip U3. ,

[0040] The signal isolation control circuit includes a communication isolation circuit, a programming voltage control circuit, a single-chip microcomputer peripheral circuit, and an interface circuit. The communication isolation circuit includes an isolation chip U2, a No. 20 resistor R20, a No. 21 resistor R21, a No. 23 resistor R23, a No. 7 capacitor C7, a No. 8 capacitor C8, and a No. 4 diode D4. The No. 7 capacitor C7 is electrically connected to the 1st and 2nd pins of the isolation chip U2, the No. 8 capacitor C8 is electrically connected to the No. 4 diode D4, the No. 21 resistor R21, and the No. 3 and 8 pins of the isolation chip U2, the No. 20 resistor R20 and the No. 23 resistor R23 are electrically connected to the 10th pin of the isolation chip U2, the 14th pin of the isolation chip U2 is electrically connected to the 19th pin of the isolation chip U2, and the programming voltage control circuit It includes a resistor No. 1 R1, a resistor No. 2 R2, a resistor No. 3 R3, a resistor No. 4 R4, a resistor No. 5 R5, a resistor No. 6 R6, a capacitor No. 1 C1, a transistor No. 1 T1, a MOS tube No. 1 V1, a MOS tube No. 2 V2, and a diode No. 1 D1. The resistor No. 1 R1 is electrically connected to the MOS tube No. 1 V1, the MOS tube No. 2 V2, and the transistor No. 1 T1. The resistor No. 2 R2 is electrically connected to the capacitor No. 1 C1, the transistor No. 1 T1, and the diode No. 2 D1. The resistor No. 3 R3 is electrically connected to the resistor No. 6 R6, the transistor No. 1 T1, and the MOS tube No. 1 V1. The resistor No. 4 R4, the resistor No. 5 R5, and the MOS tube No. 2 V2 are electrically connected to the 8th pin of the isolation chip U2. The peripheral circuit of the single-chip microcomputer includes a crystal oscillator No. 1 Y 1. Switch K1, transistor D2, diode D3, diode D5, resistor R7, resistor R8, resistor R9, resistor R10, resistor R11, resistor R12, resistor R18, resistor R19, resistor R22, resistor R24, resistor R25, capacitor C2, capacitor C3, capacitor C4, capacitor C5, capacitor C9, capacitor C11, capacitor C12, indicator LED1, voltage regulator tube P1, diode D3 is electrically connected to resistor R22, pin 1 of voltage regulator tube P1 is connected to resistor R22, capacitor C4, capacitor C5, capacitor C9, capacitor C11, capacitor C12, indicator LED1, voltage regulator tube P1, diode D3 is electrically connected to resistor R22, pin 1 of voltage regulator tube P1 is connected to resistor R22, capacitor C4, capacitor C5, capacitor C9, capacitor C11, capacitor C12, indicator LED1, voltage regulator tube P1 The No. 1 resistor R25 and the No. 12 capacitor C12 are electrically connected, the No. 2 pin of the No. 1 voltage regulator P1 is electrically connected to the No. 11 capacitor C11 and the No. 2 pin of the No. 1 voltage regulator P1, the No. 1 pin of the No. 2 transistor D2 is electrically connected to the No. 11 resistor R11 and the No. 21 pin of the single-chip computer U1, the No. 2 transistor D2 is electrically connected to the No. 12 resistor R12 and the No. 20 pin of the single-chip computer U1, the No. 3 pin of the indicator LED1 is electrically connected to the No. 19 resistor R19, the No. 18 resistor R18 is electrically connected to the No. 12 pin of the single-chip computer U1, the No. 19 resistor R19 is electrically connected to the No. 13 pin of the single-chip computer U1, the No. 5 diode D5 is electrically connected to the No. 24 resistor R24 ​​and the No. 9 capacitor C9,Crystal oscillator No. 1 Y1, capacitor No. 2 C2 are electrically connected to pin 4 of single-chip microcomputer chip U1, crystal oscillator No. 1 Y1, capacitor No. 4 C4 are electrically connected to pin 5 of single-chip microcomputer chip U1, resistor No. 7 R7 is electrically connected to pin 26 of single-chip microcomputer chip U1, capacitor No. 6 C6 is electrically connected to switch No. 1 K1, resistor No. 7 R7, resistor No. 8 R8 is electrically connected to pin 23 of single-chip microcomputer chip U1, resistor No. 9 R9 is electrically connected to pin 22 of single-chip microcomputer chip U1, resistor No. 10 R1 .... 0 is electrically connected to the 18th pin of the single-chip microcomputer chip U1, the third capacitor C3 is electrically connected to the 3rd pin of the single-chip microcomputer chip U1, the fifth capacitor C5 is electrically connected to the 6th pin and the 7th pin of the single-chip microcomputer chip U1, and the interface circuit includes a first connector J1, a first connector JP1, a first connector X1, a second connector X2, a third connector X3, a thirteenth resistor R13, a fourteenth resistor R14, a fifteenth resistor R15, a sixteenth resistor R16, and a seventeenth resistor R17 The first pin of the connector JP1 is electrically connected to the third pin of the first voltage regulator tube P1, the second pin of the connector JP1 is electrically connected to the first pin of the single-chip microcomputer chip U1, the third pin of the connector JP1 is electrically connected to the 32nd pin of the single-chip microcomputer chip U1, the fourth pin of the connector JP1 is electrically connected to the 31st pin of the single-chip microcomputer chip U1, the fifth pin of the connector JP1 is electrically connected to the 30th pin of the single-chip microcomputer chip U1, the thirteenth resistor R13 is electrically connected to the second connector X2 4 pin and the 23rd pin of the single-chip microcomputer chip U1 are electrically connected, the 14th resistor R14 is electrically connected to the 3rd pin of the second connector X2 and the 22nd pin of the single-chip microcomputer chip U1, the 16th resistor R16 is electrically connected to the 1st pin of the second connector X2 and the 18th pin of the single-chip microcomputer chip U1, the 15th resistor R15 is electrically connected to the 2nd pin of the third connector X3 and the 5th pin of the isolation chip U2, and the 17th resistor R17 is electrically connected to the 1st pin of the third connector X3 and the 4th pin of the isolation chip U2.

[0041] The 5-16 string protection board mainly uses the highly integrated SH367309 chip. This chip is a digital front-end chip for 5-16 string lithium battery BMS, suitable for lithium battery packs with a total voltage not exceeding 70V. The chip works in protection mode and can independently protect the lithium battery pack. It provides overcharge protection, over-discharge protection, temperature protection, charge and discharge overcurrent protection, short circuit protection, secondary overcharge protection, etc. The integrated balancing switch improves the consistency of the battery cells; when working in acquisition mode, it can cooperate with the MCU to manage the lithium battery pack and enable all protection functions at the same time. The chip has a built-in VADC for collecting battery cell voltage, temperature and current; a built-in CADC for collecting current to count the remaining capacity of the pack; a built-in EEPROM for saving adjustable parameters such as protection threshold and delay; a built-in TWI communication interface for operating related registers and EEPROM.

[0042] The chip supports the protection function of 5S-16S batteries and can perform ADC conversion, but as a front-end acquisition protection chip, this chip does not have intelligent functions such as capacity accumulation and calculation. At the same time, this chip supports low-end NMOS control protection, but does not support the control of high-end MOS on-off protection. There is no corresponding low-power charge pump that can be used for battery protection boards in China to realize the conversion of on-off control from low-end to high-end control. Therefore, it is difficult to achieve functional performance requirements such as external communication, diversified communication forms, low power consumption and diversified data requirements. By adding a single-chip microcomputer board, the single-chip microcomputer board retrieves the data of the battery front-end acquisition chip through the serial port, and combines the analog and digital data collected by itself to calculate and store data according to the user's requirements, and interacts with the user in the specified protocol format. The Chuan Tuwei CA-IS3642 chip with integrated isolated power supply solves the problem that the communication line cannot share the ground, protects the communication chip, and realizes the isolation of high voltage difference between internal and external circuits, further improving the circuit reliability. By using the method of returning the power to the isolation chip after the battery is powered externally, the high-power isolation chip can only communicate externally when the battery is working, and the time-sharing power supply method solves the low power consumption problem of the protection board.

[0043] During the development of this product, the "three-ization" design work was carried out actively and effectively. According to the product characteristics, full consideration was given to the universal, serialized, modular design and the inheritability, interchangeability and maintainability of the product in its design functions and structures. Standard parts, general parts and mature technologies were used to the maximum extent in the design, which effectively improved the standardization level of this product.

[0044] This product adopts mature standard technology, the main components used are standard components, and the main raw materials are also universal, which provides great convenience for product development, shortens the development cycle, and also guarantees the reliability of product design to a certain extent.

[0045] The above description is only a preferred embodiment of the present invention and does not constitute any form of limitation to the present invention. Any simple modification, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention are within the scope of the technical solution of the present invention.

Claims

1. A protection board circuit for a lithium battery BMS, characterized in that: It includes a power MOS module circuit, a main control chip U1 circuit, a short circuit protection circuit, an overvoltage protection circuit, a main control MCU control circuit and a signal isolation control circuit; wherein: the power MOS module circuit, the short circuit protection circuit, and the overvoltage protection circuit are all electrically connected to the main control chip U1 circuit, the main control MCU control circuit is electrically connected to the signal isolation control circuit, and the main control MCU control circuit and the signal isolation control circuit are electrically connected to the main control chip U1 circuit through an IIC serial port; the power MOS module circuit includes a No. 1 MOS tube, a No. 2 MOS tube No. 1, MOS tube No. 3, MOS tube No. 4, capacitor No. 32, capacitor No. 33, resistor No. 57, resistor No. 60, resistor No. 62, resistor No. 65, resistor No. 67, resistor No. 68, resistor No. 69, resistor No. 70, resistor No. 72, resistor No. 76, diode No. 4, diode No. 5, diode No. 8, MOS tube No. 15, resistor No. 65 is electrically connected to pin 34 of the main control chip U1 circuit, and resistor No. 57 and MOS tube are electrically connected to pin 36 of the main control chip U1 circuit.

2. The protection board circuit for lithium battery BMS according to claim 1, characterized in that: The power MOS module circuit is electrically connected to the main control chip U1 circuit through DSG and CHG interfaces and B- and P- through resistors, diodes and transistors.

3. The protection board circuit for lithium battery BMS according to claim 1, characterized in that: The main control chip U1 circuit includes a protection chip circuit, a balancing circuit, an overcurrent protection circuit, and a temperature sampling circuit.

4. The protection board circuit for lithium battery BMS according to claim 3, characterized in that: The protection chip circuit includes a main control chip, resistor No. 14, resistor No. 17, resistor No. 19, resistor No. 20, resistor No. 27, resistor No. 29, resistor No. 32, capacitor No. 8, capacitor No. 11, capacitor No. 13, capacitor No. 14, capacitor No. 15, diode No. 2, and diode No.

3. Resistor No. 29 is electrically connected to pins 37 and 38 of the main control chip U1 circuit, resistor No. 23 is electrically connected to pin 44 of the main control chip U1 circuit, resistor No. 14 and resistor No. 17 are electrically connected to pin 45 of the main control chip U1 circuit, resistor No. 20 is electrically connected to pins 43 and 46 of the main control chip U1 circuit, capacitor No. 11 and resistor No. 27 are electrically connected to pin 4 8 pins are electrically connected, and the balancing circuit includes resistor No. 1, resistor No. 2, resistor No. 3, resistor No. 4, resistor No. 5, resistor No. 6, resistor No. 7, resistor No. 8, resistor No. 9, resistor No. 10, resistor No. 11, resistor No. 12, resistor No. 13, resistor No. 15, resistor No. 16, resistor No. 17, resistor No. 18, resistor No. 21, resistor No. 22, resistor No. 23, resistor No. 24, resistor No. 25, resistor No. 26, resistor No. 28, resistor No. 30, resistor No. 33, resistor No. 34, resistor No. 35, resistor No. 36, resistor No. 37, resistor No. 38, resistor No. 42, resistor No. 43, resistor No. 44, resistor No. 47, resistor No. 48, resistor No. 49 Resistor No. 9, resistor No. 50, resistor No. 51, resistor No. 52, resistor No. 53, resistor No. 54, resistor No. 55, resistor No. 56, resistor No. 58, resistor No. 59, resistor No. 61, resistor No. 63, resistor No. 64, resistor No. 66, resistor No. 71, resistor No. 73, resistor No. 78, capacitor No. 3, capacitor No. 4, capacitor No. 5, capacitor No. 6, capacitor No. 7, capacitor No. 9, capacitor No. 10, capacitor No. 12, capacitor No. 17, capacitor No. 18, capacitor No. 23, capacitor No. 26, capacitor No. 27, capacitor No. 28, capacitor No. 29, capacitor No. 30, capacitor No. 31, diode No. 6, diode No. 7, transistor No. 1, transistor No. 2, Transistor No. 3, transistor No. 4, transistor No. 5, transistor No. 6, transistor No. 7, transistor No. 8, transistor No. 9, transistor No. 10, transistor No. 11, transistor No. 12, transistor No. 13, transistor No. 14, transistor No. 16, and transistor No. 17, the resistor No. 2, resistor No. 4, resistor No. 5, capacitor No. 3 are electrically connected to the first pin of the main control chip U1 circuit, the resistor No. 4, resistor No. 5, capacitor No. 3, and capacitor No. 4 are electrically connected to the second pin of the main control chip U1 circuit, the resistor No. 7, resistor No. 8, capacitor No. 4, and capacitor No. 5 are electrically connected to the third pin of the main control chip U1 circuit, the resistor No. 10, resistor No. 11, capacitor No. 5, and capacitor No. 6 are electrically connected to the fourth pin of the main control chip U1 circuit,Resistor No. 13, resistor No. 15, capacitor No. 6, and capacitor No. 7 are electrically connected to pin 5 of the main control chip U1 circuit. Resistor No. 18, resistor No. 21, capacitor No. 7, and capacitor No. 9 are electrically connected to pin 6 of the main control chip U1 circuit. Resistor No. 24, resistor No. 25, capacitor No. 9, and capacitor No. 10 are electrically connected to pin 7 of the main control chip U1 circuit. Resistor No. 28, resistor No. 30, capacitor No. 10, and capacitor No. 12 are electrically connected to pin 8 of the main control chip U1 circuit. Resistor No. 33, resistor No. 34, capacitor No. 12, and capacitor No. 17 are electrically connected to pin 9 of the main control chip U1. Resistor No. 36, resistor No. 37, and capacitor No. 17 are electrically connected to pin 10 of the main control chip U1 circuit. Capacitor No. 1 and capacitor No. 18 are electrically connected to pin 10 of the main control chip U1 circuit, resistor No. 43, resistor No. 44, capacitor No. 18 and capacitor No. 23 are electrically connected to pin 11 of the main control chip U1 circuit, resistor No. 47, resistor No. 48, capacitor No. 23 and capacitor No. 26 are electrically connected to pin 12 of the main control chip U1 circuit, resistor No. 50, resistor No. 51, capacitor No. 26 and capacitor No. 27 are electrically connected to pin 13 of the main control chip U1 circuit, resistor No. 53, resistor No. 54, capacitor No. 27 and capacitor No. 28 are electrically connected to pin 14 of the main control chip U1 circuit, resistor No. 56, resistor No. 57, capacitor No. 58 are electrically connected to pin 15 of the main control chip U1 circuit. Resistor No. 18, capacitor No. 28, and capacitor No. 29 are electrically connected to pin 15 of the main control chip U1 circuit, resistor No. 60, resistor No. 61, capacitor No. 29, capacitor No. 30, and diode No. 6 are electrically connected to pin 16 of the main control chip U1 circuit, resistor No. 66, resistor No. 71, capacitor No. 30, capacitor No. 31, and diode No. 6 are electrically connected to pin 17 of the main control chip U1 circuit, and the overcurrent protection circuit includes current sensing resistor No. 75, current sensing resistor No. 77, resistor No. 45, resistor No. 46, capacitor No. 22, capacitor No. 24, and capacitor No. 25, and the resistor No. 45, capacitor No. 22, Capacitor No. 24 is electrically connected to the 18th pin of the main control chip U1 circuit, resistor No. 46, capacitor No. 22, and capacitor No. 25 are electrically connected to the 19th pin of the main control chip U1 circuit, and the temperature sampling circuit includes thermistor No. 39, thermistor No. 40, resistor No. 41, capacitor No. 19, capacitor No. 20, and capacitor No.

21. Thermistor No. 39 and capacitor No. 19 are electrically connected to the 20th pin of the main control chip U1 circuit, thermistor No. 40 and capacitor No. 20 are electrically connected to the 21st pin of the main control chip U1 circuit, and thermistor No. 41 and capacitor No. 21 are electrically connected to the 22nd pin of the main control chip U1 circuit.

5. The protection board circuit for lithium battery BMS according to claim 1, characterized in that: The short-circuit protection circuit includes fuse No. 1, fuse No. 2, and resistor No.

74. Resistor No. 74 is electrically connected to pin 42 of the main control chip U1 circuit. Fuse No. 1, fuse No. 2, and resistor No. 74 are electrically connected to P- / C-.

6. The protection board circuit for lithium battery BMS according to claim 1, characterized in that: The overvoltage protection circuit includes a No. 1 capacitor, a No. 2 capacitor, and a No. 1 fast recovery diode. The No. 1 capacitor and the No. 1 fast recovery diode are electrically connected to P+ / C+ and B+, and the No. 2 capacitor and the No. 1 fast recovery diode are electrically connected to P- / C-.

7. The protection board circuit for lithium battery BMS according to claim 1, characterized in that: The main control MCU control circuit includes a power display control circuit, a low power control circuit, a single-chip peripheral circuit, and an interface circuit. The power display control circuit includes a No. 7 light-emitting diode, a No. 8 light-emitting diode, a No. 9 light-emitting diode, a No. 10 light-emitting diode, a No. 11 light-emitting diode, a No. 32 resistor, a No. 33 resistor, a No. 34 resistor, a No. 35 resistor, and a No. 36 resistor. The No. 36 resistor is electrically connected to the 12th pin of the single-chip chip, the No. 35 resistor is electrically connected to the 13th pin of the single-chip chip, the No. 34 resistor is electrically connected to the 14th pin of the single-chip chip, the No. 33 resistor is electrically connected to the 15th pin of the single-chip chip, the No. 32 resistor is electrically connected to the 16th pin of the single-chip chip, and the No. 32 resistor is electrically connected to the 17th pin of the single-chip chip. The resistor is electrically connected to the No. 7 light emitting diode, the No. 33 resistor is electrically connected to the No. 8 light emitting diode, the No. 34 resistor is electrically connected to the No. 9 light emitting diode, the No. 35 resistor is electrically connected to the No. 10 light emitting diode, and the No. 36 resistor is electrically connected to the No. 11 light emitting diode, and then electrically connected to GND. The low-power control circuit includes Bluetooth, No. 1 transistor, No. 2 MOS tube, No. 3 MOS tube, No. 37 resistor, No. 38 resistor, No. 39 resistor, No. 40 resistor, No. 41 resistor, No. 42 resistor, No. 43 resistor, No. 17 capacitor, and No. 18 capacitor. The No. 38 resistor and No. 2 MOS tube are electrically connected to the second pin of Bluetooth, the No. 39 resistor and No. 3 MOS tube are electrically connected to the third pin of Bluetooth, and the No. 37 resistor and No. 1 transistor are electrically connected to the No. 2 pin of Bluetooth. The tube is electrically connected to the 5th pin of Bluetooth, the No. 1 triode, the No. 2 MOS tube, the No. 3 MOS tube, the No. 37 resistor, the No. 38 resistor, the No. 39 resistor, the No. 40 resistor, the No. 17 capacitor, and the No. 18 capacitor are electrically connected to the 3rd pin of the memory, the No. 42 resistor is electrically connected to the 20th pin of the single-chip chip U3, the No. 43 resistor is electrically connected to the 21st pin of the single-chip chip, the No. 41 resistor is electrically connected to the 27th pin of the single-chip chip, the 1st pin of Bluetooth and the 6th pin of Bluetooth are electrically connected to GND, and the single-chip peripheral circuit includes the single-chip chip, the No. 2 crystal oscillator, the memory, the No. 2 switch, the No. 26 resistor, the No. 27 resistor, the No. 28 resistor, the No. 29 resistor, the No. 10 capacitor, the No. 13 capacitor, and the No. 14 capacitor , capacitor No. 15, capacitor No. 16, the crystal oscillator No. 2 and capacitor No. 10 are electrically connected to the 4th pin of the single-chip microcomputer chip, the crystal oscillator No. 2 and capacitor No. 14 are electrically connected to the 5th pin of the single-chip microcomputer chip, the resistor No. 26 is electrically connected to the 26th pin of the single-chip microcomputer chip 3, the capacitor No. 16 is electrically connected to the switch No. 2 and resistor No. 26, the resistor No. 26, the resistor No. 27 and the resistor No. 28 are electrically connected to the 3rd pin of the memory, the resistor No. 27 is electrically connected to the 23rd pin of the single-chip microcomputer chip, the resistor No. 28 is electrically connected to the 22nd pin of the single-chip microcomputer chip, the resistor No. 29 is electrically connected to the 18th pin of the single-chip microcomputer chip, the capacitor No. 13 is electrically connected to the 3rd pin of the single-chip microcomputer chip, the capacitor No. 15 is electrically connected to the 6th and 7th pins of the single-chip microcomputer chip,The interface circuit includes a two-way connector, a No. 4 connector, a No. 5 connector, a No. 6 connector, a No. 7 connector, a No. 8 connector, a No. 9 connector, a No. 30 resistor, a No. 31 resistor, and a No. 6 transistor. The No. 30 resistor is electrically connected to the No. 6 transistor and the 21st pin of the single-chip chip, the No. 31 resistor is electrically connected to the No. 6 transistor and the 20th pin of the single-chip chip, the No. 1 pin of the two-way connector, the No. 6 pin of the No. 8 connector and the No. 3 pin of the memory are electrically connected, and the No. 2 pin of the two-way connector is electrically connected to the No. 1 pin of the single-chip chip. Pin 1 is electrically connected, pin 4 of the two-way connector is electrically connected to pin 32 of the microcontroller chip, pin 6 of the two-way connector is electrically connected to pin 31 of the microcontroller chip, pin 8 of the two-way connector is electrically connected to pin 30 of the microcontroller chip, pin 2 of the No. 8 connector is electrically connected to pin 8 of the microcontroller chip, pin 2 of the No. 9 connector is electrically connected to pin 23 of the microcontroller chip, pin 3 of the No. 9 connector is electrically connected to pin 22 of the microcontroller chip, and pin 4 of the No. 9 connector is electrically connected to pin 18 of the microcontroller chip.

8. The protection board circuit for lithium battery BMS according to claim 1, characterized in that: The signal isolation control circuit includes a communication isolation circuit, a programming voltage control circuit, a single-chip peripheral circuit, and an interface circuit. The communication isolation circuit includes an isolation chip, a No. 20 resistor, a No. 21 resistor, a No. 23 resistor, a No. 7 capacitor, a No. 8 capacitor, and a No. 4 diode. The No. 7 capacitor is electrically connected to the No. 1 and No. 2 pins of the isolation chip, the No. 8 capacitor is electrically connected to the No. 4 diode, the No. 21 resistor, and the No. 3 and No. 8 pins of the isolation chip, the No. 20 resistor and the No. 23 resistor are electrically connected to the No. 10 pin of the isolation chip, and the No. 14 pin of the isolation chip is electrically connected to the No. 19 pin of the isolation chip. The programming voltage control circuit includes a No. 1 resistor, a No. 2 resistor, a No. 3 resistor, a No. 4 resistor, a No. 5 resistor, and a No. 6 resistor. , capacitor No. 1, transistor No. 1, MOS tube No. 2, MOS tube No. 1, diode No. 1, the resistor No. 1 is electrically connected to the MOS tube No. 1, the MOS tube No. 2, and the transistor No. 1, the resistor No. 2 is electrically connected to the capacitor No. 1, the transistor No. 1, and the diode No. 2, the resistor No. 3 is electrically connected to the resistor No. 6, the transistor No. 1, and the MOS tube No. 1, the resistor No. 4, the resistor No. 5, the MOS tube No. 2 is electrically connected to the 8th pin of the isolation chip, and the peripheral circuit of the single-chip computer includes a crystal oscillator No. 1, a switch No. 1, a transistor No. 2, a diode No. 3, a diode No. 5, a resistor No. 7, a resistor No. 8, a resistor No. 9, a resistor No. 10, a resistor No. 11, a resistor No. 12, a resistor No. 18, a resistor No. 19, and a resistor No. 22 , resistor No. 24, resistor No. 25, capacitor No. 2, capacitor No. 3, capacitor No. 4, capacitor No. 5, capacitor No. 9, capacitor No. 11, capacitor No. 12, indicator light, voltage regulator No. 1, the diode No. 3 is electrically connected to resistor No. 22, the first pin of the voltage regulator No. 1 is electrically connected to resistor No. 22, resistor No. 25, and capacitor No. 12, the second pin of the voltage regulator No. 1 is electrically connected to capacitor No. 11 and the second pin of the voltage regulator No. 1, the first pin of the No. 2 transistor is electrically connected to resistor No. 11 and pin 21 of the single-chip computer, the second pin of the No. 2 transistor is electrically connected to resistor No. 12 and pin 20 of the single-chip computer, the third pin of the indicator light is electrically connected to resistor No. 19, the fourth pin of the indicator light is electrically connected to resistor No. 18, the The resistor No. 1 is electrically connected to the 12th pin of the single-chip microcomputer, the resistor No. 19 is electrically connected to the 13th pin of the single-chip microcomputer, the diode No. 5 is electrically connected to the resistor No. 24 and the capacitor No. 9, the crystal oscillator No. 1 and the capacitor No. 2 are electrically connected to the 4th pin of the single-chip microcomputer chip, the crystal oscillator No. 1 and the capacitor No. 4 are electrically connected to the 5th pin of the single-chip microcomputer chip, the resistor No. 7 is electrically connected to the 26th pin of the single-chip microcomputer chip, the capacitor No. 6 is electrically connected to the switch No. 1 and the resistor No. 7, the resistor No. 8 is electrically connected to the 23rd pin of the single-chip microcomputer chip, the resistor No. 9 is electrically connected to the 22nd pin of the single-chip microcomputer chip, the resistor No. 10 is electrically connected to the 18th pin of the single-chip microcomputer chip, the capacitor No. 3 is electrically connected to the 3rd pin of the single-chip microcomputer chip, the capacitor No. 5 is electrically connected to the 6th and 7th pins of the single-chip microcomputer chip,The interface circuit includes a connector No. 1, a connector No. 1, a first connector, a second connector, a third connector, a resistor No. 13, a resistor No. 14, a resistor No. 15, a resistor No. 16, and a resistor No.

17. The first pin of the connector No. 1 is electrically connected to the third pin of the voltage regulator No. 1, the second pin of the connector No. 1 is electrically connected to the first pin of the single-chip chip, the third pin of the connector No. 1 is electrically connected to the 32nd pin of the single-chip chip, the fourth pin of the connector No. 1 is electrically connected to the 31st pin of the single-chip chip, the fifth pin of the connector No. 1 is electrically connected to the 30th pin of the single-chip chip, the thirteenth resistor is electrically connected to the fourth pin of the second connector and the 23rd pin of the single-chip chip, the fourteenth resistor is electrically connected to the third pin of the second connector and the 22nd pin of the single-chip chip, the sixteenth resistor is electrically connected to the first pin of the second connector and the 18th pin of the single-chip chip, the fifteenth resistor is electrically connected to the second pin of the third connector and the 5th pin of the isolation chip, and the seventeenth resistor is electrically connected to the first pin of the third connector and the fourth pin of the isolation chip.

9. The protection board circuit for lithium battery BMS according to any one of claims 1 to 8, characterized in that: The main control chip U1 circuit is a SH367309 chip.

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