Double-MOS controlled BMS system suitable for LEV vehicle

Abstract

The utility model relates to the technical field of LEV vehicle batteries, in particular to a double-MOS (Metal Oxide Semiconductor) controlled BMS (Battery Management System) suitable for an LEV vehicle. A battery cluster is connected with a U1 main protection chip, a U3 secondary protection chip and a U4 secondary protection chip, the U1 main protection chip is respectively connected with a charging detection circuit, a discharging MOS1, a charging MOS1 current detection resistor and an R0 resistor, the other ends of a battery positive electrode and a charging port positive electrode are connected with the charging detection circuit, the other end of the charging MOS1 is connected with a charging MOS2, the other end of the charging MOS2 is respectively connected with a Y2 AND gate output end and an anti-reverse MOS, and the other end of the charging MOS2 is connected with a charging port positive electrode. The anti-reverse MOS is respectively connected with the anti-reverse IC circuit and the F2 fuse, the anti-reverse IC circuit is connected with the charging detection circuit, the discharging MOS2 is respectively connected with the output end of the Y1 AND gate and the discharging MOS1, and the U3 secondary protection chip and the U4 secondary protection chip are both connected with the input end of the Y1 AND gate and the input end of the Y2 gate. Compared with the prior art, the circuit is high in universality, can be quickly developed in a modularized manner, reduces the cost, enables a product to be quickly put into the market, and improves the safety and the cost performance.

Description

Technical Field

[0001] This utility model relates to the field of LEV vehicle battery technology, specifically a dual MOS controlled BMS system suitable for LEV vehicles. Background Technology

[0002] As competition intensifies in the LEV (Light Electric Vehicle) system market for electric scooters, electric bicycles, and electric-assist bicycles, cost pressures are mounting. Due to the unique nature of battery products, regulatory requirements are stringent, resulting in high product costs and lengthy development and certification cycles. Meeting the numerous requirements of certification standards, including secondary overvoltage, secondary undervoltage, secondary high and low temperature, secondary overcurrent, and charging / discharging compliance, while simultaneously reducing costs and enabling rapid market entry, is a key challenge that current BMS (Battery Management System) solutions must address. Utility Model Content

[0003] To address the problems mentioned in the background art, this utility model provides a dual-MOS controlled BMS system suitable for LEV vehicles, comprising a battery cluster, a U1 main protection chip, a U3 secondary protection chip, a U4 secondary protection chip, a MOS control circuit, an anti-reverse IC circuit, and a charging detection circuit. The MOS control circuit includes a discharge MOS1, a charging MOS1, a discharge MOS2, a charging MOS2, and an anti-reverse MOS. The battery cluster is connected to the U1 main protection chip, the U3 secondary protection chip, and the U4 secondary protection chip. The U1 main protection chip is connected to the charging detection circuit, the discharge MOS1, the charging MOS1 current sensing resistor, and the R0 resistor. The positive terminal of the battery cluster is connected to an F1 fuse, and the other end of the F1 fuse is connected to the positive terminal of the battery and the positive terminal of the charging port. The other ends of the positive terminals of the battery and the charging port are connected to... Connect the charging detection circuit. The negative terminal of the battery cluster is connected to the current sensing resistor and ground respectively. The other end of the current sensing resistor is connected to the U1 main protection chip, discharge MOS2, and charging MOS1 respectively. The other end of charging MOS1 is connected to charging MOS2. The other end of charging MOS2 is connected to the output of Y2 AND gate and the anti-reverse MOS respectively. The anti-reverse MOS is connected to the anti-reverse IC circuit and the F2 fuse respectively. The F2 fuse is connected to the negative terminal of the charging port. The other end of the negative terminal of the charging port is connected to the charging detection circuit. The anti-reverse IC circuit is connected to the charging detection circuit. Discharge MOS2 is connected to the output of Y1 AND gate and discharge MOS1 respectively. The U3 secondary protection chip and the U4 secondary protection chip are both connected to the input of Y1 AND gate and the input of Y2 gate. The other end of resistor R0 is connected to diode D0. The other end of diode D0 is connected to the negative terminal of the battery. The negative terminal of the battery is connected to discharge MOS1.

[0004] The U1 main protection chip is model CW1104ALCS. The VDD pin of the U1 main protection chip is connected to diode ZDA, capacitor C5, and resistor R1. The VSS pin of the U1 main protection chip, the other end of diode ZDA, and the other end of capacitor C5 are grounded together. The VC10 pin is connected to capacitor C7, capacitor CA1, and resistor RA1. Resistors R1 and RA1 are connected together to the battery cluster. The other end of capacitor C7 is grounded. The VC9 pin of the U1 main protection chip is connected to resistor RA2 and capacitor CA2. The VC8 pin of the U1 main protection chip is connected to resistor RA3 and capacitor CA3. The VC7 pin of the U1 main protection chip is connected to resistor RA4 and capacitor CA4. The VC6 pin of the U1 main protection chip is connected to resistor RA5 and capacitor CA5. The VC5 pin of the U1 main protection chip is connected to resistor RA6 and capacitor CA6. The VC4 pin of the U1 main protection chip is connected to resistor RA7. The following components are connected to the main protection chip: CA7 capacitor, VC3 pin of U1 main protection chip, RA8 resistor and CA8 capacitor, VC2 pin of U1 main protection chip, RA9 resistor and CA9 capacitor, VC1 pin of U1 main protection chip, RA10 resistor and CA10 capacitor, VC0 pin of U1 main protection chip, RA11 resistor and CA11 capacitor, the other end of RA11 resistor connected to RA12 resistor, and capacitors CA1, CA2, CA3, CA4, CA5, CA6, CA7, CA8, CA9, CA10, CA11 capacitor, and RA12 resistor. The other end of the capacitor is grounded. The CIT pin of the U1 main protection chip is connected to the CIT1 capacitor, and the other end of the CIT1 capacitor is grounded. The RDOT pin of the U1 main protection chip is connected to the RT1 resistor. The RCOT pin of the U1 main protection chip is connected to the RT2 resistor, and the other end of the RT2 resistor is connected to the RT3 resistor. The RUT pin of the U1 main protection chip is connected to the RT5 and RT9 resistors respectively. The other ends of the RT1, RT3, RT5, and RT9 resistors are connected together to the RT4 resistor and the NTC1 thermistor. The other end of the RT4 resistor and the other end of the NTC1 thermistor are grounded together. The SEL pin of the U1 main protection chip is connected to R3. The U1 main protection chip's CCTL pin and the other end of resistor R3 are connected to ground. The U1 main protection chip's DCTL pin is connected to resistor R7, and the other end of resistor R7 is connected to the charging detection circuit. The U1 main protection chip's CO pin is connected to resistor R12, and the other end of resistor R12 is connected to transistor Q3. The other end of transistor Q3 is connected to resistor R34 and charging MOSFET1, and the other end of resistor R34 is grounded. The U1 main protection chip's VM pin is connected to the charging detection circuit and resistor R14, and the other end of resistor R14 is connected to diode D3. The other end of diode D3 is connected to the negative terminal of the battery. The U1 main protection chip's DO pin is connected to resistor R17.The other end of resistor R17 is connected to discharge MOS1. The CS pin of the U1 main protection chip is connected to resistor R18 and capacitor CS1 respectively. The other end of capacitor CS1 is grounded, and the other end of resistor R18 is connected to the current sensing resistor.

[0005] The U3 and U4 secondary protection chips are model CW1053ALJP. The VDD pin of the U3 secondary protection chip is connected to resistor RA13, diode D14A, and capacitor C18, respectively. The other ends of diode D14A and capacitor C18 are connected together to the battery cluster. The VC5 pin of the U3 secondary protection chip is connected to resistor RA14 and capacitor CB5. The other end of resistor RA14 is connected to resistor RA13. The VC4 pin of the U3 secondary protection chip is connected to resistor RA15 and capacitor CB4. The VC3 pin of the U3 secondary protection chip is connected to resistor RA16 and capacitor CB3. The VC2 pin of the U3 secondary protection chip is connected to resistor RA17 and capacitor CB2. The VC1 pin of the U3 secondary protection chip is connected to resistor RA18 and capacitor CB5. One capacitor, the VSS pin of the U3 secondary protection chip, and the other ends of capacitors CB1, CB2, CB3, CB4, and CB5 are connected together to the battery pack. The CO pin of the U3 secondary protection chip is connected to resistor R55. The other end of resistor R55 is connected to resistor R54 and transistor Q8 respectively. The VM pin of the U3 secondary protection chip is connected to diode D11. The other end of diode D11 is connected to resistor R56. The other end of resistor R56 is connected to the battery pack. The D0 pin of the U3 secondary protection chip is connected to resistor R57. The other end of resistor R57 is connected to transistor Q9. The other end of transistor Q9 is connected to resistor R60. The other end of resistor R60 is connected to the battery pack. The VINI pin of the U3 secondary protection chip is connected to resistor R59. The RDOT pin is connected to resistor RT6, and the other end of resistor RT6 is connected to resistor RT7. The RCOT pin of the U3 secondary protection chip is connected to resistor RT8, and the other end of resistor RT8 is connected to resistors RT18 and RT19 respectively. Resistors RT7, RT18, and RT19 are combined and connected to resistor RT13 and the NTC2 thermistor respectively. The CIT pin of the U3 secondary protection chip is connected to capacitor C1T2. The other ends of resistor R59, resistor RT13, NTC2 thermistor, and capacitor C1T2 are combined and connected to the battery cluster. The VDD pin of the U4 secondary protection chip is connected to resistor RA19, diode D15A, and capacitor C19 respectively. The other ends of diode D15A and capacitor C19 are combined and grounded. The U4 secondary protection chip... The VC5 pin of the U4 secondary protection chip is connected to resistor RA20 and capacitor CB10. The other end of resistor RA14 is connected to resistor RA13. The VC4 pin of the U4 secondary protection chip is connected to resistor RA21 and capacitor CB9. The VC3 pin of the U4 secondary protection chip is connected to resistor RA22 and capacitor CB8. The VC2 pin of the U4 secondary protection chip is connected to resistor RA23 and capacitor CB7. The VC1 pin of the U4 secondary protection chip is connected to resistor RA24 and capacitor CB6. The other ends of the VSS pin, capacitors CB10, CB9, CB8, CB7, and CB6 of the U4 secondary protection chip are grounded. The CO pin of the U4 secondary protection chip is connected to resistor R67. The other end of resistor R67 is connected to resistor R66 and transistor Q10.The VM pin of the U4 secondary protection chip is connected to diode D12. The other end of diode D11 is connected to resistor R69, and the other end of resistor R69 is grounded. The D0 pin of the U4 secondary protection chip is connected to resistor R70. The other end of resistor R70 is connected to resistor R72 and the source of power transistor Q11. The other end of R72 and the gate of power transistor Q11 are combined and connected to resistor R76. The other end of resistor R76 is connected to transistor Q12, and the other end of transistor Q12 is grounded. The VINI pin of the U4 secondary protection chip is connected to resistor R73. The RDOT pin of the U4 secondary protection chip is connected to resistor RT10. The other end of resistor RT10 is connected to resistor RT11 and NTC3 thermistor. The RCOT pin of the U4 secondary protection chip... One end of the U4 secondary protection chip is connected to resistor RT12, and the other end of resistor RT12 is connected to NTC3 thermistor. The CIT pin of the U4 secondary protection chip is connected to capacitor C1T3. The other ends of resistors R73, RT11, NTC3 thermistor, and C1T3 are grounded together. One end of transistor Q9 is connected to resistor R58, and the other end of resistor R58 is connected to transistor Q12. One end of transistor Q12 is connected to resistor R79, and the other ends of resistor R79 and one end of transistor Q12 are grounded together. The other end of transistor Q8 is connected to resistor R65, and the other end of resistor R65 is connected to transistor Q10, resistor R66, and diode ZD1. The other end of diode ZD1 is grounded. The other end of transistor Q10 is connected to resistor R51.

[0006] The MOS control circuit and anti-reverse IC circuit include a U2 chip, model JW3332. The EN pin of the U2 chip is connected to resistor R9. The VCC pin of the U2 chip is connected to diode ZD3 and capacitor C13. The VD pin of the U2 chip is connected to resistor R44. The GND pin of the U2 chip is connected to the other end of diode ZD3 and capacitor C13. The GATE pin of the U2 chip is connected to resistors R42 and R43, and diode ZD8. Resistor R43 is connected to the gate of power transistor M11. The GND pin of the U2 chip, diode ZD8, and resistor R42 are combined and connected to the source of transistor M11. The other end of resistor R44 is connected to the drain of power transistor M11 and a fuse. The negative terminals of charging interfaces F2 and C1 are connected. The negative terminal of charging interface C1 is connected to capacitor C15. The other end of capacitor C15 is connected to capacitor C14. The other end of capacitor C14 is connected to resistor R41 and the negative terminal of charging interface C2. The CO pin of secondary protection chip U4 is connected to diode D10. Diode D10 is connected to resistors R40, ZD7, and R41. The other end of resistor R40 is connected to the gate of power transistor M10. The other ends of diode ZD7 and resistor R41 are combined and connected to the source of power transistor M10. The CO pin of main protection chip U1 is connected to D9. D9 is connected to resistors R38, ZD6, and R39. The other end of resistor R38 is connected to the gate of power transistor M9. The source of power transistor M9, diode ZD6, and R39 are connected to the gate of power transistor M9. The drains of resistor 39 and power transistor M10 are connected together to the negative terminal of charging interface C3. The drain of power transistor M9 is connected to capacitor C6. The other end of capacitor C6 is connected to capacitor C12. The other end of capacitor C12 is connected to the source of power transistor M10. The DO pin of the U1 main protection chip is connected to diode D6. Diode D6 is connected to diode D8, transistor Q7, and resistor R47. Diode D8 is connected to transistor Q5, resistor R36, diode ZD5, resistor R28, resistor R32, resistor R37, and resistor R48. The other ends of transistors Q5 and Q7 are connected together to resistor R52. The other end of resistor R28 is connected to the gate of power transistor M2. The other end of resistor R32 is connected to the gate of power transistor M4. The other end of resistor R37 is connected to M6. The gate of the power transistor is connected to the gate of power transistor M8. The drains of power transistors M2, M4, M6, and M8 are connected together to the negative terminal of the battery, capacitor C17, and SMD5 surface mount devices. The sources of power transistors M2, M4, M6, and M8, diode ZD5, resistors R36, R52, and R47 are connected together to the negative terminal of the power supply common terminal. Pin D0 of the secondary protection chip U3 is connected to diode D5. Diode D5 is connected to diode D7, transistor Q6, and resistor R45. Diode D7 is connected to transistor Q4, resistor R33, diode ZD4, resistors R16, R31, R35, and R46.The other ends of transistors Q4 and Q6 are connected together to resistor R49. The other end of resistor R16 is connected to the gate of power transistor M1. The other end of resistor R31 is connected to the gate of power transistor M3. The other end of resistor R35 is connected to the gate of power transistor M5. The other end of resistor R46 is connected to the gate of power transistor M7. The drains of power transistors M1, M3, M5, and M7 are connected together to Com-. The sources of power transistors M1, M3, M5, and M7, diode ZD4, resistors R33, R49, and R45 are connected together to the U1 main protection chip, capacitors C16 and C6, and power transistor M9. The other end of capacitor C16 is connected to capacitor C17.

[0007] The charging detection circuit includes a charging port positive terminal, which is connected to resistor R10, diode ZD2, capacitor C9, resistor R19, resistor R25, and resistor R26. The other end of resistor R26 is connected to the charging port negative terminal. The other ends of resistor R10 and diode ZD2 are connected to transistor Q1. Transistor Q1, capacitor C9, and the other end of resistor R19 are connected to resistor R20. The other ends of resistor R20 and resistor R25 are connected to resistor R27. The other end of resistor R27 is connected to the charging port negative terminal. The other end of transistor Q1 is connected to diodes D2, D4, and D13. Two diodes are connected to resistors R11, R13, and R15 respectively. The other ends of resistors R11, R13, and R15 are connected together to the anti-reverse IC circuit. Diode D4 is connected to resistor R21. The other end of resistor R21 is connected to the U1 main protection chip and resistor R22. The other end of resistor R22 is grounded. The other end of diode D13 is connected to resistor R23. The other end of resistor R23 is connected to resistor R30 and transistor Q2 respectively. Transistor Q2 is connected to resistor R24. The other end of resistor R24 ​​is connected to the U1 main protection chip and capacitor C10. The other ends of capacitor C10, Q2, and R30 are connected together to grounded.

[0008] Compared with the prior art, this invention has strong versatility. It can be applied to most systems with only minor adjustments to key components. It can be modularly developed quickly, shortening the certification cycle, reducing costs, enabling products to be launched to the market quickly, and improving safety and cost-effectiveness. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of the overall circuit framework of this utility model;

[0010] Figure 2 This is the circuit diagram of the U1 main protection chip in this utility model;

[0011] Figure 3 The circuit diagrams for the U3 and U4 secondary protection chips in this utility model are shown below.

[0012] Figure 4 This is a circuit diagram of the MOS control circuit and the anti-reverse IC circuit in this utility model;

[0013] Figure 5 This is a circuit diagram of the charging detection circuit in this utility model. Detailed Implementation

[0014] The present invention will be further described below with reference to the accompanying drawings.

[0015] like Figures 1 to 5 A dual-MOS controlled BMS system suitable for LEV vehicles includes a battery cluster, a U1 main protection chip, a U3 secondary protection chip, a U4 secondary protection chip, a MOS control circuit, an anti-reverse IC circuit, and a charging detection circuit. The MOS control circuit includes a discharge MOS1, a charging MOS1, a discharge MOS2, a charging MOS2, and an anti-reverse MOS. The battery cluster is connected to the U1 main protection chip, the U3 secondary protection chip, and the U4 secondary protection chip. The U1 main protection chip is connected to the charging detection circuit, the discharge MOS1, the charging MOS1 current sensing resistor, and the R0 resistor. The positive terminal of the battery cluster is connected to a fuse F1. The other end of the fuse F1 is connected to the positive terminal of the battery and the positive terminal of the charging port. The other ends of the positive terminals of the battery and the charging port are connected to the charging detection circuit. The negative terminal of the battery cluster is... Do not connect the current sensing resistor to ground. Connect the other end of the current sensing resistor to the U1 main protection chip, discharge MOS2, and charging MOS1 respectively. Connect the other end of charging MOS1 to charging MOS2. Connect the other end of charging MOS2 to the output of Y2 AND gate and the anti-reverse MOS respectively. Connect the anti-reverse MOS to the anti-reverse IC circuit and the F2 fuse respectively. Connect the F2 fuse to the negative terminal of the charging port. Connect the other end of the negative terminal of the charging port to the charging detection circuit. Connect the anti-reverse IC circuit to the charging detection circuit. Connect discharge MOS2 to the output of Y1 AND gate and discharge MOS1 respectively. Connect the U3 secondary protection chip and the U4 secondary protection chip to the input of Y1 AND gate and the input of Y2 gate respectively. Connect the other end of resistor R0 to diode D0. Connect the other end of diode D0 to the negative terminal of the battery. Connect the negative terminal of the battery to discharge MOS1.

[0016] The U1 main protection chip is model CW1104ALCS. The VDD pin of the U1 main protection chip is connected to diode ZDA, capacitor C5, and resistor R1. The VSS pin of the U1 main protection chip, the other end of diode ZDA, and the other end of capacitor C5 are grounded together. The VC10 pin is connected to capacitor C7, capacitor CA1, and resistor RA1. Resistors R1 and RA1 are connected together to the battery cluster. The other end of capacitor C7 is grounded. The VC9 pin of the U1 main protection chip is connected to resistor RA2 and capacitor CA2. The VC8 pin of the U1 main protection chip is connected to resistor RA3 and capacitor CA3. The VC7 pin of the U1 main protection chip is connected to resistor RA4 and capacitor CA4. The VC6 pin of the U1 main protection chip is connected to resistor RA5 and capacitor CA5. The VC5 pin of the U1 main protection chip is connected to resistor RA6 and capacitor CA6. The VC... Pin 4 is connected to resistor RA7 and capacitor CA7 respectively. Pin VC3 of the U1 main protection chip is connected to resistor RA8 and capacitor CA8 respectively. Pin VC2 of the U1 main protection chip is connected to resistor RA9 and capacitor CA9 respectively. Pin VC1 of the U1 main protection chip is connected to resistor RA10 and capacitor CA10 respectively. Pin VC0 of the U1 main protection chip is connected to resistor RA11 and capacitor CA11 respectively. The other end of resistor RA11 is connected to resistor RA12. Capacitors CA1, CA2, CA3, CA4, CA5, CA6, CA7, CA8, and CA... The other ends of capacitors CA10, CA11, and RA12 are connected to ground. The CIT pin of the U1 main protection chip is connected to capacitor CIT1, and the other end of capacitor CIT1 is grounded. The RDOT pin of the U1 main protection chip is connected to resistor RT1. The RCOT pin of the U1 main protection chip is connected to resistor RT2, and the other end of resistor RT2 is connected to resistor RT3. The RUT pins of the U1 main protection chip are connected to resistors RT5 and RT9 respectively. The other ends of resistors RT1, RT3, RT5, and RT9 are connected together to resistor RT4 and NTC1 thermistor. The other end of the circuit is connected to ground along with the other end of the NTC1 thermistor. The SEL pin of the U1 main protection chip is connected to resistor R3. The CCTL pin of the U1 main protection chip is connected to ground along with the other end of resistor R3. The DCTL pin of the U1 main protection chip is connected to resistor R7. The other end of resistor R7 is connected to the charging detection circuit. The CO pin of the U1 main protection chip is connected to resistor R12. The other end of resistor R12 is connected to transistor Q3. The other end of transistor Q3 is connected to resistor R34 and charging MOS1. The other end of resistor R34 is grounded. The VM pin of the U1 main protection chip is connected to the charging detection circuit and resistor R14. The VM pin of the U1 main protection chip is also connected to the charger. When the charger detects the connection, it pulls the VM pin low, which functions as a forced load removal function when the charger is plugged in. The other end of resistor R14 is connected to diode D3.The other end of diode D3 is connected to the negative terminal of the battery. The DO pin of the U1 main protection chip is connected to resistor R17, and the other end of resistor R17 is connected to discharge MOSFET1. The CS pin of the U1 main protection chip is connected to resistor R18 and capacitor CS1 respectively. The other end of capacitor CS1 is grounded, and the other end of resistor R18 is connected to the current sensing resistor. The other ends of resistors RA1, RA2, RA3, RA4, RA5, RA6, RA7, RA8, RA9, RA10, RA11, and RA12 are connected to the battery cluster.

[0017] The U3 and U4 secondary protection chips are model CW1053ALJP. The VDD pin of the U3 secondary protection chip is connected to resistor RA13, diode D14A, and capacitor C18, respectively. The other ends of diode D14A and capacitor C18 are connected together to the battery cluster. The VC5 pin of the U3 secondary protection chip is connected to resistor RA14 and capacitor CB5. The other end of resistor RA14 is connected to resistor RA13. The VC4 pin of the U3 secondary protection chip is connected to resistor RA15 and capacitor CB4. The VC3 pin of the U3 secondary protection chip is connected to resistor RA16 and capacitor CB3. The VC2 pin of the U3 secondary protection chip is connected to resistor RA17 and capacitor CB2. The VC1 pin of the U3 secondary protection chip is connected to resistor RA18 and capacitor CB1. The capacitors, including the VSS pin of the U3 secondary protection chip, capacitors CB1, CB2, CB3, CB4, and CB5, are connected together at their other ends to the battery pack. The CO pin of the U3 secondary protection chip is connected to resistor R55, the other end of which is connected to resistor R54 and transistor Q8. The VM pin of the U3 secondary protection chip is connected to diode D11, the other end of which is connected to resistor R56, the other end of which is connected to the battery pack. The D0 pin of the U3 secondary protection chip is connected to resistor R57, the other end of which is connected to transistor Q9, the other end of which is connected to resistor R60, the other end of which is connected to the battery pack. The VINI pin of the U3 secondary protection chip is connected to resistor R59. The RDOT pin is connected to resistor RT6, and the other end of resistor RT6 is connected to resistor RT7. The RCOT pin of the U3 secondary protection chip is connected to resistor RT8, and the other end of resistor RT8 is connected to resistors RT18 and RT19 respectively. Resistors RT7, RT18, and RT19 are combined and connected to resistor RT13 and the NTC2 thermistor respectively. The CIT pin of the U3 secondary protection chip is connected to capacitor C1T2. The other ends of resistor R59, resistor RT13, the NTC2 thermistor, and capacitor C1T2 are combined and connected to the battery cluster. The VDD pin of the U4 secondary protection chip is connected to resistor RA19, diode D15A, and capacitor C19 respectively. The other ends of diode D15A and capacitor C19 are combined and grounded. The U4 secondary protection chip... Pin VC5 is connected to resistor RA20 and capacitor CB10. The other end of resistor RA14 is connected to resistor RA13. Pin VC4 of the U4 secondary protection chip is connected to resistor RA21 and capacitor CB9. Pin VC3 of the U4 secondary protection chip is connected to resistor RA22 and capacitor CB8. Pin VC2 of the U4 secondary protection chip is connected to resistor RA23 and capacitor CB7. Pin VC1 of the U4 secondary protection chip is connected to resistor RA24 and capacitor CB6. Pin VSS of the U4 secondary protection chip, and the other ends of capacitors CB10, CB9, CB8, CB7, and CB6 are grounded. Pin CO of the U4 secondary protection chip is connected to resistor R67. The other end of resistor R67 is connected to resistor R66 and transistor Q10.The VM pin of the U4 secondary protection chip is connected to diode D12. The other end of diode D11 is connected to resistor R69, and the other end of resistor R69 is grounded. The D0 pin of the U4 secondary protection chip is connected to resistor R70. The other end of resistor R70 is connected to resistor R72 and the source of power transistor Q11. The other end of resistor R72 and the gate of power transistor Q11 are combined and connected to resistor R76. The other end of resistor R76 is connected to transistor Q12, and the other end of transistor Q12 is grounded. The VINI pin of the U4 secondary protection chip is connected to resistor R73. The RDOT pin of the U4 secondary protection chip is connected to resistor RT10. The other end of resistor RT10 is connected to resistor RT11 and NTC3 thermistor. The RC pin of the U4 secondary protection chip... The OT pin is connected to resistor RT12, and the other end of resistor RT12 is connected to the NTC3 thermistor. The CIT pin of the U4 secondary protection chip is connected to capacitor C1T3. The other ends of resistor R73, resistor RT11, the NTC3 thermistor, and capacitor C1T3 are grounded together. One end of transistor Q9 is connected to resistor R58, and the other end of resistor R58 is connected to transistor Q12. One end of transistor Q12 is connected to resistor R79, and the other ends of resistor R79 and one end of transistor Q12 are grounded together. The other end of transistor Q8 is connected to resistor R65, and the other end of resistor R65 is connected to transistor Q10, resistor R66, and diode ZD1 respectively. The other end of diode ZD1 is grounded. The other end of transistor Q10 is connected to resistor R51. The other ends of resistors RA13, RA14, RA15, RA16, RA17, RA18, RA19, RA20, RA21, RA22, RA23, and RA24 are connected to the battery cluster.

[0018] The MOS control circuit and anti-reverse IC circuit include the U2 chip, model JW3332. The EN pin of the U2 chip is connected to resistor R9. The VCC pin of the U2 chip is connected to diode ZD3 and capacitor C13 respectively. The VD pin of the U2 chip is connected to resistor R44. The GND pin of the U2 chip is connected to the other end of diode ZD3 and capacitor C13 respectively. The GATE pin of the U2 chip is connected to resistors R42 and R43, and diode ZD8 respectively. Resistor R43 is connected to the gate of power transistor M11. The GND pin of the U2 chip, diode ZD8, and resistor R42 are combined and connected to the source of transistor M11. The other end of resistor R44 is connected to the drain of power transistor M11, fuse F2, and capacitor C13 respectively. The negative terminal of the charging interface 1 (C1) is connected to capacitor C15. The other end of capacitor C15 is connected to capacitor C14. The other end of capacitor C14 is connected to resistor R41 and the negative terminal of the charging interface 2. The CO pin of the secondary protection chip U4 is connected to diode D10. Diode D10 is connected to resistors R40, ZD7, and R41. The other end of resistor R40 is connected to the gate of power transistor M10. The other ends of diode ZD7 and resistor R41 are combined and connected to the source of power transistor M10. The CO pin of the main protection chip U1 is connected to D9. D9 is connected to resistors R38, ZD6, and R39. The other end of resistor R38 is connected to the gate of power transistor M9. The source of power transistor M9, diode ZD6, and resistor R39 are connected to the gate of power transistor M9. The drains of transistors M10 and M10 are connected together to the negative terminal of the C3 charging interface. The drain of transistor M9 is connected to capacitor C6. The other end of capacitor C6 is connected to capacitor C12. The other end of capacitor C12 is connected to the source of transistor M10. The DO pin of the U1 main protection chip is connected to diode D6. Diode D6 is connected to diode D8, transistor Q7, and resistor R47. Diode D8 is connected to transistor Q5, resistor R36, diode ZD5, resistor R28, resistor R32, resistor R37, and resistor R48. The other ends of transistors Q5 and Q7 are connected together to resistor R52. The other end of resistor R28 is connected to the gate of transistor M2. The other end of resistor R32 is connected to the gate of transistor M4. The other end of resistor R37 is connected to the source of transistor M6. The gate of the M8 power transistor is connected to the gate of the M2 power transistor, the drain of the M4 power transistor, the drain of the M6 ​​power transistor, and the drain of the M8 power transistor are connected together to the negative terminal of the battery, capacitor C17, and SMD5 surface mount devices. The sources of the M2 power transistor, M4 power transistor, M6 power transistor, and M8 power transistor, diode ZD5, resistor R36, resistor R52, and resistor R47 are connected together to the negative terminal of the power supply common terminal. Pin D0 of the U3 secondary protection chip is connected to diode D5. Diode D5 is connected to diode D7, transistor Q6, and resistor R45. Diode D7 is connected to transistor Q4, resistor R33, diode ZD4, resistor R16, resistor R31, resistor R35, and resistor R46.The other ends of transistors Q4 and Q6 are connected together to resistor R49. The other end of resistor R16 is connected to the gate of power transistor M1. The other end of resistor R31 is connected to the gate of power transistor M3. The other end of resistor R35 is connected to the gate of power transistor M5. The other end of resistor R46 is connected to the gate of power transistor M7. The drains of power transistors M1, M3, M5, and M7 are connected together to Com-. The sources of power transistors M1, M3, M5, and M7, diode ZD4, resistors R33, R49, and R45 are connected together to the U1 main protection chip, capacitors C16 and C6, and power transistor M9. The other end of capacitor C16 is connected to capacitor C17. The drain of power transistor M11 is connected to fuse F2. Fuse F2 is connected to the negative terminal of the charging interface and the SMD6 surface mount device. The other end of R45 is connected to resistors RS1 and RS2 respectively. The other ends of resistors RS1 and RS2 are combined and connected to the negative terminal of the battery and resistor RJ1. The other end of resistor RJ1 is grounded.

[0019] The charging detection circuit includes a charging port positive terminal, which is connected to resistor R10, diode ZD2, capacitor C9, resistor R19, resistor R25, and resistor R26. The other end of resistor R26 is connected to the charging port negative terminal. Resistor R10 and the other end of diode ZD2 are connected to transistor Q1. Transistor Q1, capacitor C9, and the other end of resistor R19 are connected to resistor R20. The other end of resistor R20 and the other end of resistor R25 are connected to resistor R27. The other end of resistor R27 is connected to the charging port negative terminal. The other end of transistor Q1 is connected to diodes D2, D4, and D13. Diodes are connected to resistors R11, R13, and R15 respectively. The other ends of resistors R11, R13, and R15 are connected together to the anti-reverse IC circuit. Diode D4 is connected to resistor R21. The other end of resistor R21 is connected to the U1 main protection chip and resistor R22. The other end of resistor R22 is grounded. The other end of diode D13 is connected to resistor R23. The other end of resistor R23 is connected to resistor R30 and transistor Q2 respectively. Transistor Q2 is connected to resistor R24. The other end of resistor R24 ​​is connected to the U1 main protection chip and capacitor C10. The other ends of capacitor C10, Q2, and R30 are connected together to grounded.

[0020] The charging and discharging ports are used separately. The main protection chip is responsible for primary charging overcurrent, primary discharging overcurrent, short circuit protection, high and low temperature protection, and undervoltage and overvoltage protection. The secondary protection chips are two cascaded 5-cell chips to achieve secondary high and low temperature protection and secondary undervoltage and overvoltage protection. The charging detection circuit performs functions such as charger insertion detection, closing the discharge port after charger insertion, removing the load flag signal after charger insertion, and powering the reverse polarity protection IC circuit. The reverse polarity protection IC circuit and the reverse polarity protection MOSFET work together to achieve reverse connection protection of the charging port and prevent the charging port from discharging through the MOSFET body diode. Because the chip is powered by the charger, it does not consume battery power, and the power consumption of this part is extremely low.

[0021] During operation, current enters the battery cluster through the charging MOS. The current is monitored by the main protection chip and the secondary protection chip, and the reverse protection IC circuit ensures that the current direction is correct. During discharge, current flows to the load through the discharge MOS. When the main protection chip detects overcharge, it shuts down the charging MOS. When the main protection chip or the secondary protection chip detects over-discharge, it shuts down the discharge MOS. When the main protection chip detects overcurrent, it cuts off the current path. When the reverse protection IC detects reverse current, it shuts down the reverse protection MOS.

Claims

1. A dual-MOS controlled BMS system suitable for LEV vehicles, comprising a battery cluster, a U1 main protection chip, a U3 secondary protection chip, a U4 secondary protection chip, a MOS control circuit, an anti-reverse IC circuit, and a charging detection circuit, characterized in that: The MOS control circuit includes a discharge MOS1, a charge MOS1, a discharge MOS2, a charge MOS2, and a reverse protection MOS. The battery cluster is connected to a U1 main protection chip, a U3 secondary protection chip, and a U4 secondary protection chip. The U1 main protection chip is connected to a charging detection circuit, a discharge MOS1, a charge MOS1 current sensing resistor, and a resistor R0. The positive terminal of the battery cluster is connected to a fuse F1. The other end of the F1 fuse is connected to the positive terminal of the battery and the positive terminal of the charging port. The other ends of the positive terminals of the battery and the charging port are connected to the charging detection circuit. The negative terminal of the battery cluster is connected to a current sensing resistor and ground. The other end of the current sensing resistor is connected to the U1 main protection chip, the discharge MOS2, and the charge MOS2. MOS1, the other end of which is connected to charging MOS2. The other end of charging MOS2 is connected to the output of Y2 AND gate and the anti-reverse MOS. The anti-reverse MOS is connected to the anti-reverse IC circuit and the F2 fuse. The F2 fuse is connected to the negative terminal of the charging port. The other end of the negative terminal of the charging port is connected to the charging detection circuit. The anti-reverse IC circuit is connected to the charging detection circuit. Discharging MOS2 is connected to the output of Y1 AND gate and discharging MOS1. The U3 secondary protection chip and the U4 secondary protection chip are both connected to the input of Y1 AND gate and the input of Y2 gate. The other end of resistor R0 is connected to diode D0. The other end of diode D0 is connected to the negative terminal of the battery. The negative terminal of the battery is connected to discharging MOS1.

2. A BMS system with dual MOS control suitable for LEV vehicles according to claim 1, characterized in that: The U1 main protection chip is model CW1104ALCS. The VDD pin of the U1 main protection chip is connected to diode ZDA, capacitor C5, and resistor R1. The VSS pin of the U1 main protection chip, the other end of diode ZDA, and the other end of capacitor C5 are grounded together. The VC10 pin is connected to capacitor C7, capacitor CA1, and resistor RA1. Resistors R1 and RA1 are connected together to the battery cluster. The other end of capacitor C7 is grounded. The VC9 pin of the U1 main protection chip is connected to resistor RA2 and capacitor CA2. The VC8 pin of the U1 main protection chip is connected to resistor RA3 and capacitor CA3. The VC7 pin of the U1 main protection chip is connected to resistor RA4 and capacitor CA4. The VC6 pin of the U1 main protection chip is connected to resistor RA5 and capacitor CA5. The VC5 pin of the U1 main protection chip is connected to resistor RA6 and capacitor CA6. The VC4 pin of the U1 main protection chip is connected to resistor RA7. The following components are connected to the main protection chip: CA7 capacitor, VC3 pin of U1 main protection chip, RA8 resistor and CA8 capacitor, VC2 pin of U1 main protection chip, RA9 resistor and CA9 capacitor, VC1 pin of U1 main protection chip, RA10 resistor and CA10 capacitor, VC0 pin of U1 main protection chip, RA11 resistor and CA11 capacitor, the other end of RA11 resistor connected to RA12 resistor, and capacitors CA1, CA2, CA3, CA4, CA5, CA6, CA7, CA8, CA9, CA10, CA11 capacitor, and RA12 resistor. The other end of the capacitor is grounded. The CIT pin of the U1 main protection chip is connected to the CIT1 capacitor, and the other end of the CIT1 capacitor is grounded. The RDOT pin of the U1 main protection chip is connected to the RT1 resistor. The RCOT pin of the U1 main protection chip is connected to the RT2 resistor, and the other end of the RT2 resistor is connected to the RT3 resistor. The RUT pin of the U1 main protection chip is connected to the RT5 and RT9 resistors respectively. The other ends of the RT1, RT3, RT5, and RT9 resistors are connected together to the RT4 resistor and the NTC1 thermistor. The other end of the RT4 resistor and the other end of the NTC1 thermistor are grounded together. The SEL pin of the U1 main protection chip is connected to R3. The U1 main protection chip's CCTL pin and the other end of resistor R3 are connected to ground. The U1 main protection chip's DCTL pin is connected to resistor R7, and the other end of resistor R7 is connected to the charging detection circuit. The U1 main protection chip's CO pin is connected to resistor R12, and the other end of resistor R12 is connected to transistor Q3. The other end of transistor Q3 is connected to resistor R34 and charging MOSFET1, and the other end of resistor R34 is grounded. The U1 main protection chip's VM pin is connected to the charging detection circuit and resistor R14, and the other end of resistor R14 is connected to diode D3. The other end of diode D3 is connected to the negative terminal of the battery. The U1 main protection chip's DO pin is connected to resistor R17.The other end of resistor R17 is connected to discharge MOS1. The CS pin of the U1 main protection chip is connected to resistor R18 and capacitor CS1 respectively. The other end of capacitor CS1 is grounded, and the other end of resistor R18 is connected to the current sensing resistor.

3. A BMS system with dual MOS control suitable for LEV vehicles according to claim 1, characterized in that: The U3 and U4 secondary protection chips are model CW1053ALJP. The VDD pin of the U3 secondary protection chip is connected to resistor RA13, diode D14A, and capacitor C18, respectively. The other ends of diode D14A and capacitor C18 are connected together to the battery cluster. The VC5 pin of the U3 secondary protection chip is connected to resistor RA14 and capacitor CB5. The other end of resistor RA14 is connected to resistor RA13. The VC4 pin of the U3 secondary protection chip is connected to resistor RA15 and capacitor CB4. The VC3 pin of the U3 secondary protection chip is connected to resistor RA16 and capacitor CB3. The VC2 pin of the U3 secondary protection chip is connected to resistor RA17 and capacitor CB2. The VC1 pin of the U3 secondary protection chip is connected to resistor RA18 and capacitor CB5. One capacitor, the VSS pin of the U3 secondary protection chip, and the other ends of capacitors CB1, CB2, CB3, CB4, and CB5 are connected together to the battery pack. The CO pin of the U3 secondary protection chip is connected to resistor R55. The other end of resistor R55 is connected to resistor R54 and transistor Q8 respectively. The VM pin of the U3 secondary protection chip is connected to diode D11. The other end of diode D11 is connected to resistor R56. The other end of resistor R56 is connected to the battery pack. The D0 pin of the U3 secondary protection chip is connected to resistor R57. The other end of resistor R57 is connected to transistor Q9. The other end of transistor Q9 is connected to resistor R60. The other end of resistor R60 is connected to the battery pack. The VINI pin of the U3 secondary protection chip is connected to resistor R59. The RDOT pin is connected to resistor RT6, and the other end of resistor RT6 is connected to resistor RT7. The RCOT pin of the U3 secondary protection chip is connected to resistor RT8, and the other end of resistor RT8 is connected to resistors RT18 and RT19 respectively. Resistors RT7, RT18, and RT19 are combined and connected to resistor RT13 and the NTC2 thermistor respectively. The CIT pin of the U3 secondary protection chip is connected to capacitor C1T2. The other ends of resistor R59, resistor RT13, NTC2 thermistor, and capacitor C1T2 are combined and connected to the battery cluster. The VDD pin of the U4 secondary protection chip is connected to resistor RA19, diode D15A, and capacitor C19 respectively. The other ends of diode D15A and capacitor C19 are combined and grounded. The U4 secondary protection chip... The VC5 pin of the U4 secondary protection chip is connected to resistor RA20 and capacitor CB10. The other end of resistor RA14 is connected to resistor RA13. The VC4 pin of the U4 secondary protection chip is connected to resistor RA21 and capacitor CB9. The VC3 pin of the U4 secondary protection chip is connected to resistor RA22 and capacitor CB8. The VC2 pin of the U4 secondary protection chip is connected to resistor RA23 and capacitor CB7. The VC1 pin of the U4 secondary protection chip is connected to resistor RA24 and capacitor CB6. The other ends of the VSS pin, capacitors CB10, CB9, CB8, CB7, and CB6 of the U4 secondary protection chip are grounded. The CO pin of the U4 secondary protection chip is connected to resistor R67. The other end of resistor R67 is connected to resistor R66 and transistor Q10.The VM pin of the U4 secondary protection chip is connected to diode D12. The other end of diode D11 is connected to resistor R69, and the other end of resistor R69 is grounded. The D0 pin of the U4 secondary protection chip is connected to resistor R70. The other end of resistor R70 is connected to resistor R72 and the source of power transistor Q11. The other end of R72 and the gate of power transistor Q11 are combined and connected to resistor R76. The other end of resistor R76 is connected to transistor Q12, and the other end of transistor Q12 is grounded. The VINI pin of the U4 secondary protection chip is connected to resistor R73. The RDOT pin of the U4 secondary protection chip is connected to resistor RT10. The other end of resistor RT10 is connected to resistor RT11 and NTC3 thermistor. The RCOT pin of the U4 secondary protection chip... One end of the U4 secondary protection chip is connected to resistor RT12, and the other end of resistor RT12 is connected to NTC3 thermistor. The CIT pin of the U4 secondary protection chip is connected to capacitor C1T3. The other ends of resistors R73, RT11, NTC3 thermistor, and C1T3 are grounded together. One end of transistor Q9 is connected to resistor R58, and the other end of resistor R58 is connected to transistor Q12. One end of transistor Q12 is connected to resistor R79, and the other ends of resistor R79 and one end of transistor Q12 are grounded together. The other end of transistor Q8 is connected to resistor R65, and the other end of resistor R65 is connected to transistor Q10, resistor R66, and diode ZD1. The other end of diode ZD1 is grounded. The other end of transistor Q10 is connected to resistor R51.

4. A BMS system with dual MOS control suitable for LEV vehicles according to claim 1, characterized in that: The MOS control circuit and anti-reverse IC circuit include a U2 chip, model JW3332. The EN pin of the U2 chip is connected to resistor R9. The VCC pin of the U2 chip is connected to diode ZD3 and capacitor C13. The VD pin of the U2 chip is connected to resistor R44. The GND pin of the U2 chip is connected to the other end of diode ZD3 and capacitor C13. The GATE pin of the U2 chip is connected to resistors R42 and R43, and diode ZD8. Resistor R43 is connected to the gate of power transistor M11. The GND pin of the U2 chip, diode ZD8, and resistor R42 are combined and connected to the source of transistor M11. The other end of resistor R44 is connected to the drain of power transistor M11 and a fuse. The negative terminals of charging interfaces F2 and C1 are connected. The negative terminal of charging interface C1 is connected to capacitor C15. The other end of capacitor C15 is connected to capacitor C14. The other end of capacitor C14 is connected to resistor R41 and the negative terminal of charging interface C2. The CO pin of secondary protection chip U4 is connected to diode D10. Diode D10 is connected to resistors R40, ZD7, and R41. The other end of resistor R40 is connected to the gate of power transistor M10. The other ends of diode ZD7 and resistor R41 are combined and connected to the source of power transistor M10. The CO pin of main protection chip U1 is connected to D9. D9 is connected to resistors R38, ZD6, and R39. The other end of resistor R38 is connected to the gate of power transistor M9. The source of power transistor M9, diode ZD6, and R39 are connected to the gate of power transistor M9. The drains of resistor 39 and power transistor M10 are connected together to the negative terminal of charging interface C3. The drain of power transistor M9 is connected to capacitor C6. The other end of capacitor C6 is connected to capacitor C12. The other end of capacitor C12 is connected to the source of power transistor M10. The DO pin of the U1 main protection chip is connected to diode D6. Diode D6 is connected to diode D8, transistor Q7, and resistor R47. Diode D8 is connected to transistor Q5, resistor R36, diode ZD5, resistor R28, resistor R32, resistor R37, and resistor R48. The other ends of transistors Q5 and Q7 are connected together to resistor R52. The other end of resistor R28 is connected to the gate of power transistor M2. The other end of resistor R32 is connected to the gate of power transistor M4. The other end of resistor R37 is connected to M6. The gate of the power transistor is connected to the gate of power transistor M8. The drains of power transistors M2, M4, M6, and M8 are connected together to the negative terminal of the battery, capacitor C17, and SMD5 surface mount devices. The sources of power transistors M2, M4, M6, and M8, diode ZD5, resistors R36, R52, and R47 are connected together to the negative terminal of the power supply common terminal. Pin D0 of the secondary protection chip U3 is connected to diode D5. Diode D5 is connected to diode D7, transistor Q6, and resistor R45. Diode D7 is connected to transistor Q4, resistor R33, diode ZD4, resistors R16, R31, R35, and R46.The other ends of transistors Q4 and Q6 are connected together to resistor R49. The other end of resistor R16 is connected to the gate of power transistor M1. The other end of resistor R31 is connected to the gate of power transistor M3. The other end of resistor R35 is connected to the gate of power transistor M5. The other end of resistor R46 is connected to the gate of power transistor M7. The drains of power transistors M1, M3, M5, and M7 are connected together to Com-. The sources of power transistors M1, M3, M5, and M7, diode ZD4, resistors R33, R49, and R45 are connected together to the U1 main protection chip, capacitors C16 and C6, and power transistor M9. The other end of capacitor C16 is connected to capacitor C17.

5. A BMS system with dual MOS control suitable for LEV vehicles according to claim 1, characterized in that: The charging detection circuit includes a charging port positive terminal, which is connected to resistor R10, diode ZD2, capacitor C9, resistor R19, resistor R25, and resistor R26. The other end of resistor R26 is connected to the charging port negative terminal. The other ends of resistor R10 and diode ZD2 are connected to transistor Q1. Transistor Q1, capacitor C9, and the other end of resistor R19 are connected to resistor R20. The other ends of resistor R20 and resistor R25 are connected to resistor R27. The other end of resistor R27 is connected to the charging port negative terminal. The other end of transistor Q1 is connected to diodes D2, D4, and D13. Two diodes are connected to resistors R11, R13, and R15 respectively. The other ends of resistors R11, R13, and R15 are connected together to the anti-reverse IC circuit. Diode D4 is connected to resistor R21. The other end of resistor R21 is connected to the U1 main protection chip and resistor R22. The other end of resistor R22 is grounded. The other end of diode D13 is connected to resistor R23. The other end of resistor R23 is connected to resistor R30 and transistor Q2 respectively. Transistor Q2 is connected to resistor R24. The other end of resistor R24 ​​is connected to the U1 main protection chip and capacitor C10. The other ends of capacitor C10, Q2, and R30 are connected together to grounded.

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