Safety control circuit of high-voltage box

Abstract

The utility model discloses a safety control circuit of a high-voltage box, which relates to the technical field of electric automobiles, and comprises a main positive contactor KM9 and a main negative contactor KM0, a normally open contact of the main positive contactor KM9 is connected in series on a positive pole circuit of an electrical main loop, one end of a coil of the main positive contactor KM9 is electrically connected with a 24V power supply, the other end of the coil of the main positive contactor KM9 is electrically connected with a normally open contact of a normally closed contactor KM10, and the normally closed contactor KM10 is electrically connected with a normally closed contactor KM0. A normally open contact of the normally closed contactor KM10 is electrically connected with the interface P5, a coil of the normally closed contactor KM10 is electrically connected with an emergency stop interface X21, and the emergency stop interface X21 is electrically connected with an emergency stop switch; a normally open contact of the main negative contactor KM0 is connected in series to a negative electrode circuit of the electrical main loop, one end of a coil of the main negative contactor KM0 is electrically connected with a 24V power supply, and the other end of the coil is electrically connected with an interface P5; and the interface P5 is electrically connected with the battery management system. According to the utility model, the safety of an electrical loop is improved, the reliability of a system is improved, and potential safety hazards are eliminated.

Description

TECHNICAL FIELD

[0001] The utility model relates to electric automobile technical field, especially a kind of safety control circuit when high current and high voltage flow through high pressure box. BACKGROUND

[0002] At present, the main function of high pressure box is used to control system electrical main loop communication or disconnection, the battery management system installed in it can simultaneously monitor battery voltage, current, temperature and the state of switch, contactor etc., and the local battery group is discriminated, thermal management control, equalization control etc., while sending local battery information and responding remote control.

[0003] However, when encountering numerous power battery systems and numerous connection nodes, the safety and reliability of electrical circuit is crucial, and the existing high pressure box mostly adopts electric automobile field technical scheme, and the electrical main loop uses DC contactor to communicate or disconnect, and the DC contactor in electric automobile field adopts closed arc-extinguishing chamber structure, so this type of contactor has poor arc-extinguishing capability and is not suitable for high-power and high-voltage rated power battery system, so that the safety and reliability of the system cannot be guaranteed. UTILITY MODEL CONTENT

[0004] In view of the above defects, the purpose of the utility model is to provide a safety control circuit of high pressure box, which improves the safety of electrical circuit and the reliability of system and eliminates safety hazards.

[0005] In order to achieve the above purpose, the technical scheme of the utility model is as follows:

[0006] A safety control circuit of high pressure box, comprising main positive contactor KM9 and main negative contactor KM0, the normally open contact of the main positive contactor KM9 is connected in series on the positive circuit of electrical main loop, one end of the coil of the main positive contactor KM9 is electrically connected with 24V power supply, and the other end is electrically connected with the normally open contact of normally closed contactor KM10, the normally open contact of the normally closed contactor KM10 is electrically connected with interface P5, the coil of the normally closed contactor KM10 is electrically connected with emergency stop interface X21, and the emergency stop interface X21 is electrically connected with emergency stop switch;The normally open contact of the main negative contactor KM0 is connected in series on the negative circuit of electrical main loop, one end of the coil of the main negative contactor KM0 is electrically connected with 24V power supply, and the other end is electrically connected with the interface P5;The interface P5 is electrically connected with battery management system.

[0007] Among them, the positive circuit of electrical main loop is electrically connected with Hall current sensor H2, the negative circuit of electrical main loop is electrically connected with Hall current sensor H1, and the Hall current sensor H2 and the Hall current sensor H1 are both communicatively connected with the battery management system.

[0008] The normally open contact of the main positive contactor KM9 is connected in parallel with the series circuit of the normally open contact of the main positive pre-charging contactor YC-KM9 and the resistor YC-R9, one end of the coil of the main positive pre-charging contactor YC-KM9 is electrically connected to a 24V power supply, one end of the coil is electrically connected to the interface P4, and the interface P4 is electrically connected to the battery management system.

[0009] The feedback output of the main positive contactor KM9 is electrically connected to a 24V power supply at one end and to the interface P3 at the other end; the feedback output of the main negative contactor KM0 is electrically connected to a 24V power supply at one end and to the interface P3 at the other end, and the interface P3 is electrically connected to the battery management system.

[0010] One end of the normally open contact of the main positive contactor KM9 is electrically connected to the positive electrode of the energy storage battery box through a fuse FU9, and the other end of the normally open contact of the main positive contactor KM9 is electrically connected to the positive electrode of the load circuit and the Hall current sensor H1, and the Hall current sensor H1 is electrically connected to the high-voltage interconnection positive electrode.

[0011] One end of the normally open contact of the main negative contactor KM0 is electrically connected to the Hall current sensor H2, the Hall current sensor H2 is electrically connected to the negative electrode of the energy storage battery box, and the other end of the normally open contact of the main negative contactor KM0 is electrically connected to the negative electrode of the load circuit and the high-voltage interconnection negative electrode.

[0012] The load circuit includes an intelligent power unit circuit, an intelligent power unit / direct current fast charging socket circuit, a first drive motor controller circuit, a second drive motor controller circuit, a three-in-one circuit, an energy storage battery box heating circuit, a cab air conditioner / direct current slow charging socket circuit, and an air conditioner power supply circuit.

[0013] The intelligent power unit circuit includes a resistor YC-R7 electrically connected with the normally open contact of the main positive contactor KM9 and a contactor KM7, the resistor YC-R7 is electrically connected with the normally open contact of a pre-charge contactor YC-KM7, the normally open contact of the contactor KM7 and the normally open contact of the pre-charge contactor YC-KM7 are electrically connected with the positive electrode of the intelligent power unit through a fuse FU7, the coils of the contactor KM7 and the pre-charge contactor YC-KM7 are electrically connected with the interface P5; the intelligent power unit / DC fast charging socket circuit includes a resistor YC-R5 electrically connected with the normally open contact of the main positive contactor KM9 and a contactor KM5, the resistor YC-R5 is electrically connected with the normally open contact of a pre-charge contactor YC-KM5, the normally open contact of the contactor KM5 and the normally open contact of the pre-charge contactor YC-KM5 are electrically connected with the positive electrode of the intelligent power unit / DC fast charging socket through a fuse FU5, the coils of the contactor KM5 and the pre-charge contactor YC-KM5 are electrically connected with the interface P5; the first drive motor controller circuit includes a resistor YC-R11 electrically connected with the normally open contact of the main positive contactor KM9 and a contactor KM11, the resistor YC-R11 is electrically connected with the normally open contact of a pre-charge contactor YC-KM11, the normally open contact of the contactor KM11 and the normally open contact of the pre-charge contactor YC-KM11 are electrically connected with the positive electrode of the first drive motor controller through a fuse FU11, the coils of the contactor KM11 and the pre-charge contactor YC-KM11 are electrically connected with the interface P5; the second drive motor controller circuit includes a resistor YC-R13 electrically connected with the normally open contact of the main positive contactor KM9 and a contactor KM13, the resistor YC-R13 is electrically connected with the normally open contact of a pre-charge contactor YC-KM13, the normally open contact of the contactor KM13 and the normally open contact of the pre-charge contactor YC-KM13 are electrically connected with the positive electrode of the second drive motor controller through a fuse FU13, the coils of the contactor KM13 and the pre-charge contactor YC-KM13 are electrically connected with the interface P5.

[0014] The three-in-one circuit comprises the normally open contact of the main positive contactor KM9 and the normally open contact of the contactor KM15, the resistance YC-R15 is electrically connected with the normally open contact of the pre-charging contactor YC-KM15, the normally open contact of the contactor KM15 and the normally open contact of the pre-charging contactor YC-KM15 are electrically connected with the three-in-one positive electrode through the fuse FU15, the coils of the contactor KM15 and the pre-charging contactor YC-KM15 are electrically connected with the interface P4; the cab air conditioner / DC slow charging socket circuit comprises the normally open contact of the main positive contactor KM9 and the normally open contact of the contactor KM17, the resistance YC-R17 is electrically connected with the normally open contact of the pre-charging contactor YC-KM17, the normally open contact of the contactor KM17 and the normally open contact of the pre-charging contactor YC-KM17 are electrically connected with the cab air conditioner / DC slow charging socket positive electrode through the fuse FU17, and the coils of the contactor KM17 and the pre-charging contactor YC-KM17 are electrically connected with the interface P4.

[0015] The energy storage battery box heating circuit comprises the normally open contact of the main positive contactor KM9 and the normally open contact of the contactor KM16, the normally open contact of the contactor KM16 is electrically connected with the energy storage battery box heating positive electrode through the fuse FU16, and the coil of the contactor KM16 is electrically connected with the interface P4; the air conditioner power supply circuit comprises the normally open contact of the main positive contactor KM9 and the normally open contact of the contactor KM23, the normally open contact of the contactor KM23 is electrically connected with the air conditioner power supply positive electrode through the fuse FU23, and the coil of the contactor KM23 is electrically connected with the interface P4.

[0016] After the above technical scheme is adopted, the cab air conditioner / DC slow charging socket circuit has the following beneficial effects:

[0017] The safety control circuit of the high-voltage box of this utility model includes a main positive contactor KM9 and a main negative contactor KM0. The normally open contact of the main positive contactor KM9 is connected in series in the positive circuit of the main electrical circuit. One end of the coil of the main positive contactor KM9 is electrically connected to a 24V power supply, and the other end is electrically connected to the normally open contact of a normally closed contactor KM10. The normally open contact of the normally closed contactor KM10 is electrically connected to interface P5. The coil of the normally closed contactor KM10 is electrically connected to the emergency stop interface X21, and the emergency stop interface X21 is electrically connected to an emergency stop switch. The normally open contact of the main negative contactor KM0 is connected in series in the negative circuit of the main electrical circuit. One end of the coil of the main negative contactor KM0 is electrically connected to a 24V power supply, and the other end is electrically connected to the interface P5. Interface P5 is electrically connected to the battery management system. This invention employs a main positive contactor and a main negative contactor suitable for high-power systems, which improves the reliability of the electrical circuit. At the same time, a normally closed contactor is connected in series in the control circuit of the main positive contactor. The normally closed contactor is connected to the emergency stop switch outside the high-voltage box. In case of an emergency, pressing the emergency stop switch can cut off the electrical circuit, thus improving the safety of the electrical circuit, improving the reliability of the system, and eliminating safety hazards.

[0018] In summary, the safety control circuit of the high-voltage box of this utility model solves the technical problems such as poor electrical circuit safety in electric vehicles in the prior art. The safety control circuit of the high-voltage box of this utility model improves the safety of the electrical circuit, enhances the reliability of the system, and eliminates potential safety hazards. Attached Figure Description

[0019] Figure 1 This is a circuit diagram of the safety control circuit of the high-voltage box of this utility model;

[0020] Figure 2 This is the circuit diagram of interface P3 of the safety control circuit of the high-voltage box of this utility model;

[0021] Figure 3 This is the circuit diagram of interface P4 of the safety control circuit of the high-voltage box of this utility model;

[0022] Figure 4 This is the circuit diagram of interface P5 of the safety control circuit of the high-voltage box of this utility model. Detailed Implementation

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0024] The directions mentioned in this manual are based on the directions shown in the attached diagram and represent only relative positional relationships, not absolute positional relationships.

[0025] like Figure 1 , Figure 2 and Figure 4As shown, a safety control circuit for a high-voltage box includes a main positive contactor KM9 and a main negative contactor KM0. The normally open contact of the main positive contactor KM9 is connected in series in the positive circuit of the main electrical circuit. One end of the coil of the main positive contactor KM9 is electrically connected to a 24V power supply, and the other end is electrically connected to the normally open contact of a normally closed contactor KM10. The normally open contact of the normally closed contactor KM10 is electrically connected to interface P5. One end of the feedback output of the main positive contactor KM9 is electrically connected to a 24V power supply, and the other end is electrically connected to interface P3. The two ends of the coil of the normally closed contactor KM10 are electrically connected to the emergency stop 24V+ and 24VG pins of the emergency stop interface X21, respectively. The emergency stop interface X21 is electrically connected to an emergency stop switch (not shown in the figure; the emergency stop switch can be installed outside the high-voltage box). The normally open contact of the main negative contactor KM0 is connected in series in the negative circuit of the main electrical circuit. One end of the coil of the main negative contactor KM0 is electrically connected to a 24V power supply, and the other end is electrically connected to interface P5. One end of the feedback output of the main negative contactor KM0 is electrically connected to a 24V power supply, and the other end is electrically connected to interface P3. Both interface P5 and interface P3 are electrically connected to the battery management system.

[0026] like Figure 1 As shown, a Hall current sensor H2 is electrically connected to the positive terminal of the main electrical circuit, and a Hall current sensor H1 is electrically connected to the negative terminal. Both Hall current sensors H2 and H1 are communicatively connected to the battery management system (BMS). Hall current sensors H1 and H2 are used to collect current data. Both sensors use CAN communication, which allows for faster transmission of the collected signals to the BMS. The BMS processes the current signals collected by the high-precision Hall current sensors and has a self-test function for the main electrical circuit. By promptly collecting information from the high-precision Hall current sensors, the BMS takes appropriate measures to control the on / off state of other load contactors, further improving the reliability of the local battery pack's main electrical circuit and the performance of the BMS unit, thus ensuring the reliable operation of the battery system.

[0027] like Figure 1 and Figure 3 As shown, the normally open contact of the main positive contactor KM9 is connected in parallel with the normally open contact of the main positive pre-charge contactor YC-KM9 and the series circuit of the resistor YC-R9. One end of the coil of the main positive pre-charge contactor YC-KM9 is electrically connected to a 24V power supply, and the other end is electrically connected to interface P4. Interface P4 is electrically connected to the battery management system.

[0028] like Figure 1As shown, one end of the normally open contact of the main positive contactor KM9 is electrically connected to the positive terminal of the energy storage battery box via fuse FU9. The other end of the normally open contact of the main positive contactor KM9 is electrically connected to the positive terminal of the load circuit and Hall current sensor H1. Hall current sensor H1 is electrically connected to the positive terminal of the high-voltage interconnect. One end of the normally open contact of the main negative contactor KM0 is electrically connected to Hall current sensor H2. Hall current sensor H2 is electrically connected to the negative terminal of the energy storage battery box. The other end of the normally open contact of the main negative contactor KM0 is electrically connected to the negative terminal of the load circuit and the negative terminal of the high-voltage interconnect.

[0029] like Figure 1 As shown, the load circuit includes an intelligent power unit circuit, an intelligent power unit / DC fast charging socket circuit, a first drive motor controller circuit, a second drive motor controller circuit, a three-in-one circuit, an energy storage battery box heating circuit, a cab air conditioner / DC slow charging socket circuit, and an air conditioner power supply circuit.

[0030] like Figure 1 , Figure 2 and Figure 4 As shown, the intelligent power unit circuit includes a resistor YC-R7 electrically connected to the normally open contact of the main positive contactor KM9 and the normally open contact of contactor KM7. Resistor YC-R7 is also electrically connected to the normally open contact of the pre-charge contactor YC-KM7. The normally open contacts of contactor KM7 and the pre-charge contactor YC-KM7 are connected to the positive terminal of the intelligent power unit via fuse FU7. One end of the coil of contactor KM7 is electrically connected to a 24V power supply, and the other end is electrically connected to interface P5. One end of the feedback output of contactor KM7 is electrically connected to a 24V power supply, and the other end is electrically connected to interface P3. One end of the coil of the pre-charge contactor YC-KM7 is electrically connected to a 24V power supply, and the other end is electrically connected to interface P5. The negative terminal of the intelligent power unit is electrically connected to the normally open contact of the main negative contactor KM0.

[0031] like Figure 1 , Figure 2 and Figure 4 As shown, the intelligent power unit / DC fast charging socket circuit includes a resistor YC-R5 electrically connected to the normally open contact of the main positive contactor KM9 and the normally open contact of contactor KM5. Resistor YC-R5 is electrically connected to the normally open contact of the pre-charge contactor YC-KM5. The normally open contacts of contactor KM5 and the pre-charge contactor YC-KM5 are electrically connected to the positive terminal of the intelligent power unit / DC fast charging socket via fuse FU5. One end of the coil of contactor KM5 is electrically connected to a 24V power supply, and the other end is electrically connected to interface P5. One end of the feedback output of contactor KM5 is electrically connected to a 24V power supply, and the other end is electrically connected to interface P3. One end of the coil of the pre-charge contactor YC-KM5 is electrically connected to a 24V power supply, and the other end is electrically connected to interface P5. The negative terminal of the intelligent power unit / DC fast charging socket is electrically connected to the normally open contact of the main negative contactor KMO.

[0032] like Figure 1 , Figure 3 and Figure 4 As shown, the first drive motor controller circuit includes a resistor YC-R11 electrically connected to the normally open contact of the main positive contactor KM9 and the normally open contact of contactor KM11. Resistor YC-R11 is electrically connected to the normally open contact of the pre-charge contactor YC-KM11. The normally open contacts of contactor KM11 and the pre-charge contactor YC-KM11 are electrically connected to the positive terminal of the first drive motor controller via fuse FU11. One end of the coil of contactor KM11 is electrically connected to a 24V power supply, and the other end is electrically connected to interface P5. One end of the feedback output of contactor KM11 is electrically connected to a 24V power supply, and the other end is electrically connected to interface P4. One end of the coil of the pre-charge contactor YC-KM11 is electrically connected to a 24V power supply, and the other end is electrically connected to interface P5. The negative terminal of the first drive motor controller is electrically connected to the normally open contact of the main negative contactor KM0.

[0033] like Figure 1 , Figure 3 and Figure 4 As shown, the second drive motor controller circuit includes a resistor YC-R13 electrically connected to the normally open contact of the main positive contactor KM9 and the normally open contact of contactor KM13. Resistor YC-R13 is electrically connected to the normally open contact of the pre-charge contactor YC-KM13. The normally open contacts of contactor KM13 and the pre-charge contactor YC-KM13 are electrically connected to the positive terminal of the second drive motor controller via fuse FU13. One end of the coil of contactor KM13 is electrically connected to a 24V power supply, and the other end is electrically connected to interface P5. One end of the feedback output of contactor KM13 is electrically connected to a 24V power supply, and the other end is electrically connected to interface P4. One end of the coil of the pre-charge contactor YC-KM13 is electrically connected to a 24V power supply, and the other end is electrically connected to interface P5. The negative terminal of the second drive motor controller is electrically connected to the normally open contact of the main negative contactor KM0.

[0034] like Figure 1 and Figure 3 As shown, the three-in-one circuit includes a resistor YC-R15 electrically connected to the normally open contact of the main positive contactor KM9 and the normally open contact of contactor KM15. Resistor YC-R15 is electrically connected to the normally open contact of the pre-charge contactor YC-KM15. The normally open contacts of contactor KM15 and the pre-charge contactor YC-KM15 are electrically connected to the three-in-one positive terminal via fuse FU15. One end of the coil of contactor KM15 is electrically connected to a 24V power supply, and the other end is electrically connected to interface P4. One end of the feedback output of contactor KM15 is electrically connected to a 24V power supply, and the other end is electrically connected to interface P4. One end of the coil of the pre-charge contactor YC-KM15 is electrically connected to a 24V power supply, and the other end is electrically connected to interface P4. The three-in-one negative terminal is electrically connected to the normally open contact of the main negative contactor KM0.

[0035] like Figure 1 and Figure 3 As shown, the cab air conditioning / DC slow charging socket circuit includes a resistor YC-R17 and a normally open contact of contactor KM17, both electrically connected to the normally open contact of the main positive contactor KM9. Resistor YC-R17 is also electrically connected to the normally open contact of the pre-charge contactor YC-KM17. The normally open contacts of contactor KM17 and pre-charge contactor YC-KM17 are connected to the positive terminal of the cab air conditioning / DC slow charging socket via fuse FU17. One end of the coil of contactor KM17 is electrically connected to a 24V power supply, and the other end is connected to interface P4. One end of the feedback output of contactor KM17 is electrically connected to a 24V power supply, and the other end is connected to interface P4. One end of the coil of the pre-charge contactor YC-KM17 is electrically connected to a 24V power supply, and the other end is connected to interface P4. The negative terminal of the cab air conditioning / DC slow charging socket is electrically connected to the normally open contact of the main negative contactor KM0.

[0036] like Figure 1 and Figure 3 As shown, the energy storage battery box heating circuit includes a normally open contact of contactor KM16, which is electrically connected to the normally open contact of the main positive contactor KM9. The normally open contact of contactor KM16 is electrically connected to the positive terminal of the energy storage battery box heating circuit via fuse FU16. One end of the coil of contactor KM16 is electrically connected to a 24V power supply, and the other end is electrically connected to interface P4. The negative terminal of the energy storage battery box heating circuit is electrically connected to the normally open contact of the main negative contactor KM0.

[0037] like Figure 1 and Figure 3 As shown, the air conditioner power supply circuit includes a normally open contact of contactor KM23, which is electrically connected to the normally open contact of the main positive contactor KM9. The normally open contact of contactor KM23 is electrically connected to the positive terminal of the air conditioner power supply through fuse FU23. One end of the coil of contactor KM23 is electrically connected to a 24V power supply, and the other end is electrically connected to interface P4. The negative terminal of the air conditioner power supply is electrically connected to the normally open contact of the main negative contactor KM0.

[0038] In summary, the safety control circuit of the high-voltage box of this utility model improves the safety of the electrical circuit, enhances the reliability of the system, and eliminates potential safety hazards.

[0039] This utility model is not limited to the specific embodiments described above. Any modifications made by those skilled in the art based on the above concept without creative effort shall fall within the protection scope of this utility model.

Claims

1. A safety control circuit for a high-voltage box, characterized in that, The system includes a main positive contactor KM9 and a main negative contactor KM0. The normally open contact of the main positive contactor KM9 is connected in series in the positive circuit of the main electrical circuit. One end of the coil of the main positive contactor KM9 is electrically connected to a 24V power supply, and the other end is electrically connected to the normally open contact of a normally closed contactor KM10. The normally open contact of the normally closed contactor KM10 is electrically connected to interface P5, and the coil of the normally closed contactor KM10 is electrically connected to emergency stop interface X21, which is electrically connected to an emergency stop switch. The normally open contact of the main negative contactor KM0 is connected in series in the negative circuit of the main electrical circuit. One end of the coil of the main negative contactor KM0 is electrically connected to a 24V power supply, and the other end is electrically connected to interface P5. Interface P5 is electrically connected to the battery management system.

2. The safety control circuit for the high-voltage box according to claim 1, characterized in that, A Hall current sensor H2 is electrically connected to the positive terminal circuit of the main electrical circuit, and a Hall current sensor H1 is electrically connected to the negative terminal circuit of the main electrical circuit. Both the Hall current sensor H2 and the Hall current sensor H1 are communicatively connected to the battery management system.

3. The safety control circuit for the high-voltage box according to claim 2, characterized in that, The normally open contact of the main positive contactor KM9 is connected in parallel with the normally open contact of the main positive pre-charge contactor YC-KM9 and the series circuit of the resistor YC-R9. One end of the coil of the main positive pre-charge contactor YC-KM9 is electrically connected to a 24V power supply, and the other end is electrically connected to interface P4. Interface P4 is electrically connected to the battery management system.

4. The safety control circuit for the high-voltage box according to claim 3, characterized in that, The feedback output of the main positive contactor KM9 is electrically connected to a 24V power supply at one end and to interface P3 at the other end; the feedback output of the main negative contactor KM0 is electrically connected to a 24V power supply at one end and to interface P3 at the other end, and interface P3 is electrically connected to the battery management system.

5. The safety control circuit for the high-voltage box according to claim 4, characterized in that, One end of the normally open contact of the main positive contactor KM9 is electrically connected to the positive terminal of the energy storage battery box through the fuse FU9. The other end of the normally open contact of the main positive contactor KM9 is electrically connected to the positive terminal of the load circuit and the Hall current sensor H1. The Hall current sensor H1 is electrically connected to the positive terminal of the high voltage interconnect.

6. The safety control circuit for the high-voltage box according to claim 5, characterized in that, One end of the normally open contact of the main negative contactor KM0 is electrically connected to the Hall current sensor H2, and the Hall current sensor H2 is electrically connected to the negative terminal of the energy storage battery box. The other end of the normally open contact of the main negative contactor KM0 is electrically connected to the negative terminal of the load circuit and the negative terminal of the high voltage interconnection.

7. The safety control circuit for the high-voltage box according to claim 6, characterized in that, The load circuit includes an intelligent power unit circuit, an intelligent power unit / DC fast charging socket circuit, a first drive motor controller circuit, a second drive motor controller circuit, a three-in-one circuit, an energy storage battery box heating circuit, a cab air conditioner / DC slow charging socket circuit, and an air conditioner power supply circuit.

8. The safety control circuit for the high-voltage box according to claim 7, characterized in that, The intelligent power unit circuit includes a resistor YC-R7 electrically connected to the normally open contact of the main positive contactor KM9 and the normally open contact of contactor KM7. The resistor YC-R7 is electrically connected to the normally open contact of the pre-charge contactor YC-KM7. The normally open contacts of contactor KM7 and the pre-charge contactor YC-KM7 are electrically connected to the positive terminal of the intelligent power unit via fuse FU7. The coils of both contactor KM7 and the pre-charge contactor YC-KM7 are electrically connected to interface P5. The intelligent power unit / DC... The fast charging socket circuit includes a resistor YC-R5 electrically connected to the normally open contact of the main positive contactor KM9 and the normally open contact of contactor KM5. The resistor YC-R5 is electrically connected to the normally open contact of the pre-charge contactor YC-KM5. The normally open contacts of contactor KM5 and the pre-charge contactor YC-KM5 are electrically connected to the positive terminal of the intelligent power unit / DC fast charging socket via fuse FU5. The coils of both contactor KM5 and the pre-charge contactor YC-KM5 are electrically connected to interface P5; the first drive motor... The controller circuit includes a resistor YC-R11 electrically connected to the normally open contact of the main positive contactor KM9 and a normally open contact of contactor KM11. The resistor YC-R11 is electrically connected to the normally open contact of the pre-charge contactor YC-KM11. The normally open contacts of contactor KM11 and the pre-charge contactor YC-KM11 are electrically connected to the positive terminal of the first drive motor controller via fuse FU11. The coils of both contactor KM11 and the pre-charge contactor YC-KM11 are electrically connected to interface P5; the second... The drive motor controller circuit includes a resistor YC-R13 and a normally open contact of contactor KM13, which are electrically connected to the normally open contact of the main positive contactor KM9. The resistor YC-R13 is electrically connected to the normally open contact of the pre-charge contactor YC-KM13. The normally open contacts of contactor KM13 and pre-charge contactor YC-KM13 are electrically connected to the positive terminal of the second drive motor controller through fuse FU13. The coils of contactor KM13 and pre-charge contactor YC-KM13 are both electrically connected to interface P5.

9. The safety control circuit for the high-voltage box according to claim 7, characterized in that, The three-in-one circuit includes a resistor YC-R15 electrically connected to the normally open contact of the main positive contactor KM9 and a normally open contact of contactor KM15. The resistor YC-R15 is electrically connected to the normally open contact of the pre-charge contactor YC-KM15. The normally open contacts of contactor KM15 and pre-charge contactor YC-KM15 are electrically connected to the three-in-one positive terminal via fuse FU15. The coils of contactor KM15 and pre-charge contactor YC-KM15 are both electrically connected to interface P4. The cab air conditioning / direct... The DC slow charging socket circuit includes a resistor YC-R17 and a normally open contact of contactor KM17, which are electrically connected to the normally open contact of the main positive contactor KM9. The resistor YC-R17 is electrically connected to the normally open contact of the pre-charge contactor YC-KM17. The normally open contact of contactor KM17 and the normally open contact of pre-charge contactor YC-KM17 are electrically connected to the positive terminal of the cab air conditioner / DC slow charging socket through fuse FU17. The coils of contactor KM17 and pre-charge contactor YC-KM17 are both electrically connected to interface P4.

10. The safety control circuit for the high-voltage box according to claim 7, characterized in that, The energy storage battery box heating circuit includes a normally open contact of contactor KM16 electrically connected to the normally open contact of the main positive contactor KM9. The normally open contact of contactor KM16 is electrically connected to the positive terminal of the energy storage battery box heating via fuse FU16, and the coil of contactor KM16 is electrically connected to interface P4. The air conditioner power supply circuit includes a normally open contact of contactor KM23 electrically connected to the normally open contact of the main positive contactor KM9. The normally open contact of contactor KM23 is electrically connected to the positive terminal of the air conditioner power supply via fuse FU23, and the coil of contactor KM23 is electrically connected to interface P4.

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