A power distribution box and charging method for new energy buses

Abstract

The present invention provides a power distribution box and charging method for new energy buses. The power distribution box includes a shell and an outer cover arranged on the shell, and also includes a 20-way chip fuse F1-F20 integrated inside the shell, a 9-way flat-plate fuse T1-T9, and 5 relays, which are respectively a charging wake-up relay, a first A+ relay and a second A+ relay capable of receiving 12V power supply from a charging pile, a front compartment heat dissipation relay, a rear compartment heat dissipation relay, and an electromagnetic power main switch. The power distribution box provided by the present invention has a compact structure, optimizes the power-off logic of the whole vehicle, realizes charging when the whole vehicle is powered off, avoids low-voltage battery feeding failure, and causes the vehicle to be unable to operate normally the next day. Feeding also refers to the continued consumption of battery power by the electrical equipment of the whole vehicle after charging is completed. It can realize charging of the whole vehicle by turning off the mechanical power main switch, and no special person is required to stay after charging is completed, thereby improving charging safety and saving the use cost of the operating unit.

Description

Technical Field

[0001] The present invention belongs to the technical field of new energy buses, and in particular relates to a power distribution box and a charging method for new energy buses. Background Art

[0002] With the vigorous development of my country's industrial civilization, environmental pollution problems have become increasingly serious. New energy vehicles, because they use non-traditional energy to power vehicles, have greatly reduced the impact of vehicle emissions on the environment. Electric vehicles and hydrogen-powered vehicles can even achieve true zero emissions.

[0003] In order to adapt to the development trend of new energy vehicles and with the continuous advancement of science and technology, new energy buses will also develop in the direction of high intelligence and integration. Due to the replacement of bus energy, new energy buses have highlighted the following problems: 1) The number of electrical components is increasing, the space in the electrical compartment is insufficient, the wiring harnesses and cables are numerous and messy, and maintenance is difficult; 2) The driver has bad driving habits and immediately turns off the electromagnetic power switch after turning off the key switch, resulting in the ECU, on-board video recorder, bus instrument and other modules not having time to save data, resulting in data loss. In addition, the electromagnetic power switch is arranged in the upper left corner of the instrument panel in the form of a rocker switch. When the driver leaves for a short time, this switch is turned off to avoid power consumption of some electrical equipment that is not controlled by the ignition switch, but some normal electrical equipment still consumes power. When the vehicle is not used for a long time, the mechanical power switch must be disconnected; 3) Nighttime charging requires turning on the mechanical power switch, and charging cannot be done if it is disconnected. Under normal circumstances, the charging pile needs to charge the high-voltage power battery when the mechanical power switch is connected, because the DCDC inverter in the four-in-one is used to charge the low-voltage battery at the same time, and to power the instrument, VCU, TBOX, BMS, etc. At the same time, the power consumption of the whole vehicle is indirectly from the power of the charging pile, and will not cause damage to the low-voltage battery. However, after charging is completed, the power consumption of the entire vehicle will be converted to the consumption of the low-voltage battery. At this time, a dedicated person will be on duty in the bus fleet to disconnect the mechanical power main switch (positive pole of the low-voltage battery) to put the circuit of the entire vehicle in an open circuit state. If the person on duty neglects or forgets, the low-voltage battery will be fed back in the early morning of the next day, affecting the normal operation of the vehicle and posing a greater safety hazard.

[0004] With the increase of electrical equipment in new energy buses and the development trend of compact vehicle layout, the application of multifunctional and high-power power distribution boxes is bound to become more and more widespread. Summary of the invention

[0005] In order to solve the problems existing in the background technology, the first object of the present invention is to provide a charging method for a new energy bus.

[0006] The technical solution of the present invention is as follows:

[0007] A charging method for a new energy bus comprises the following steps:

[0008] Step S1: Turn off the main mechanical power switch;

[0009] Step S2: Connecting the high-voltage power battery provided on the vehicle body to the charging pile;

[0010] Step S3: The charging pile provides 12V power to the first A+ relay and the second A+ relay at the same time, and the normally open contacts "30, 87" of the two relays are closed;

[0011] Step S4: stimulating the low-voltage battery to work;

[0012] Step S51: The low-voltage battery current flows into the second A+ relay after passing through the 5A fuse. Since the normally open contacts "30, 87" of the second A+ relay are in a closed state, the current flows to the charging wake-up relay at this time. Since the mechanical power main switch is in a disconnected state, the normally closed contacts "30, 87a" of the charging wake-up relay are still in a closed state, so the charging wake-up relay supplies current to the VCU, instrumentation, BMS, TBOX, DC / DC and the high-voltage power battery wake-up battery charging module, so that they enter the charging wake-up state;

[0013] Step S52: After the low-voltage battery current passes through the 40A fuse, it flows into the first A+ relay. Since the mechanical power main switch is in the off state, the normally closed contacts "30, 87a" of the first A+ relay are still in the closed state, so the current flows into the VCU, instrument, BMS, TBOX, and DC / DC through the normally closed contacts of the first A+ relay, making them enter the working state;

[0014] Step S6: Since the wake-up battery charging module has been awakened, the high-voltage power battery enters the charging mode;

[0015] Step S7: Since the DC / DC has been awakened and is in working state, the DC / DC can output a voltage of 27.5V to charge the low-voltage battery. At the same time, the working power supply of the VCU, instrument, BMS, TBOX, and DC / DC is also switched to be powered by the DC / DC.

[0016] The second object of the present invention is to provide a power distribution box for a new energy bus, comprising a shell and an outer cover arranged on the shell, and also comprising 20-way chip fuses F1-F20, 9-way flat-plate fuses T1-T9, 5 relays respectively including a charging wake-up relay, a first A+ relay and a second A+ relay capable of receiving 12V power supply from a charging pile, a front compartment heat dissipation relay, a rear compartment heat dissipation relay and an electromagnetic power main switch integrated inside the shell;

[0017] Among them, the flat-plate fuse T4 is connected to the flat-plate fuses T1, T2, T3, T5, and T6 respectively, the flat-plate fuse T1 is connected to the normally closed contact of the first A+ relay, the first A+ relay is connected to the chip fuses F1-F5 respectively, the chip fuse F1 is connected to the vehicle body instrument, the chip fuse F2 is connected to the vehicle body VCU, the chip fuse F3 is connected to the vehicle body BMS, the chip fuse F4 is connected to the vehicle body four-in-one high-voltage integrated controller, and the chip fuse F5 is connected to the vehicle body TBOX; the flat-plate fuse T2 is a spare fuse, the flat-plate fuse T3 is connected to the vehicle body rear module, the flat-plate fuse T5 is connected to the vehicle body dual-source steering pump, and the flat-plate fuse T6 is connected to the vehicle body front fuse box;

[0018] The flat-plate fuse T4 is connected to the chip fuses F8-F13 respectively, the chip fuse F8 is connected to the vehicle body IC card and the proximity switch, the chip fuse F9 is connected to the charging wake-up relay, the chip fuses F10 and F13 are backup fuses, the chip fuse F11 is connected to the vehicle body motor controller, and the chip fuse F12 is connected to the vehicle body electronic differential;

[0019] The flat-plate fuse T4 is also connected to the electromagnetic power main switch, and the electromagnetic power main switch is connected to the chip fuses F6, F7, F14-F20 respectively. The chip fuse F6 is connected to the vehicle body ignition switch. The chip fuses F7, F14, F15, F17, F18, and F20 are spare fuses. The chip fuse F16 is connected to the front compartment cooling relay, and the front compartment cooling relay is connected to the front compartment cooling controller and the front compartment radiator. The chip fuse F19 is connected to the rear compartment cooling relay, and the rear compartment cooling relay is connected to the rear compartment cooling controller and the rear compartment radiator.

[0020] The flat-plate fuse T4 is connected to the mechanical power main switch, the mechanical power main switch is connected to the low-voltage battery, the line side between the low-voltage battery and the mechanical power main switch is connected to the second A+ relay through a 5A fuse and to the first A+ relay through a 40A fuse, the low-voltage battery line on the mechanical power main switch side is connected to the first A+ relay through a flat-plate fuse T1 and to the charging wake-up relay through a chip fuse F9, and the charging wake-up relay is respectively connected to the vehicle body VCU, instrument BMS, TBOX, and DC / DC in the four-in-one high-voltage integrated controller.

[0021] As a preferred embodiment of the present invention, the distribution box is also integrated with 4-way waterproof honeycomb plug-ins J, K, M, N, and the connection between the distribution box and each wiring harness of the vehicle body is achieved through the waterproof honeycomb plug-ins.

[0022] As a preferred embodiment of the present invention, the outer cover is opened in a flip-up manner.

[0023] As a preferred embodiment of the present invention, the shell is made of nylon flame retardant material.

[0024] As a preferred embodiment of the present invention, the outer cover is transparent and a circuit function diagram is printed on the outer cover.

[0025] As a preferred embodiment of the present invention, both ends of the cellular plug-in are provided with line number markings to prevent wrong line insertion.

[0026] The beneficial effects of the present invention are as follows:

[0027] (1) The power distribution box for new energy buses provided by the present invention has a compact structure and optimizes the power-off logic of the entire vehicle. It can prevent the driver from turning off the electromagnetic power main switch immediately after turning off the ignition switch, so that the power of the entire vehicle is disconnected with a delay of 5 seconds, leaving time for modules such as the ECU, on-board video recorder, and bus instrument to store data.

[0028] (2) The power distribution box for new energy buses provided by the present invention optimizes the charging strategy to achieve charging when the whole vehicle is powered off, avoiding low-voltage battery feeding failures that would result in failure to operate normally the next day. Feeding also refers to the continued consumption of battery power by the electrical equipment of the whole vehicle after charging is completed.

[0029] (3) The power distribution box for new energy buses provided by the present invention can realize charging of the entire vehicle by turning off the mechanical power main switch. After charging is completed, no special person is required to stay behind, thereby improving charging safety and saving the use cost of the operating unit;

[0030] (4) The power distribution box for new energy buses provided by the present invention improves the integration of the electrical system, saves space costs, component costs and cable costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] By referring to the following description in conjunction with the accompanying drawings, and with a more comprehensive understanding of the present invention, other objects and results of the present invention will become more clear and easy to understand. In the accompanying drawings:

[0032] Figure 1 It is a structural schematic diagram of the present invention.

[0033] Figure 2 It is a schematic diagram of the internal structure of the present invention.

[0034] Figure 3 for Figure 2 Internal structure wiring diagram.

[0035] Figure 4 It is a circuit diagram of the present invention.

[0036] Figure 5 It is a schematic diagram of the present invention.

[0037] The figures are marked as follows: charging wake-up relay 1, first A+ relay 2, second A+ relay 3, front compartment cooling relay 4, rear compartment cooling relay 5, electromagnetic power main switch 6, low-voltage battery 7, high-voltage power battery 8, mechanical power main switch 9. DETAILED DESCRIPTION

[0038] In order to enable those skilled in the art to better understand the technical solution and advantages of the present invention, the present application is described in detail below in conjunction with the accompanying drawings, but it is not intended to limit the protection scope of the present invention.

[0039] In the description of this application, it should be noted that the terms "inside", "below", etc. indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of the application is usually placed when in use, which is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application. In addition, the terms "first", "second", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0040] In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "disposed" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0041] Example 1

[0042] See also Figure 1 and Figure 2 As shown: A power distribution box for a new energy bus, comprising a shell and an outer cover arranged on the shell, and also comprising 20-way chip fuses F1-F20, 9-way flat-plate fuses T1-T9, and 5 relays, which are respectively a charging wake-up relay 1, a first A+ relay 2 and a second A+ relay 3 capable of receiving 12V power from a charging pile, a front compartment cooling relay 4, a rear compartment cooling relay 5, and an electromagnetic power main switch 6;

[0043] See also Figures 3 to 5As shown: the flat-plate fuse T4 is connected to the flat-plate fuses T1, T2, T3, T5, and T6 respectively, the flat-plate fuse T1 is connected to the normally closed contact of the first A+ relay 2, the first A+ relay 2 is connected to the chip fuses F1-F5 respectively, the chip fuse F1 is connected to the vehicle body instrument, the chip fuse F2 is connected to the vehicle body VCU, the chip fuse F3 is connected to the vehicle body BMS, the chip fuse F4 is connected to the vehicle body four-in-one high-voltage integrated controller, and the chip fuse F5 is connected to the vehicle body TBOX; the flat-plate fuse T2 is a spare fuse, the flat-plate fuse T3 is connected to the vehicle body rear module, the flat-plate fuse T5 is connected to the vehicle body dual-source steering pump, and the flat-plate fuse T6 is connected to the vehicle body front fuse box;

[0044] The flat-plate fuse T4 is connected to the chip fuses F8-F13 respectively, the chip fuse F8 is connected to the vehicle body IC card and the proximity switch, the chip fuse F9 is connected to the charging wake-up relay 1, the chip fuses F10 and F13 are spare fuses, the chip fuse F11 is connected to the vehicle body motor controller, and the chip fuse F12 is connected to the vehicle body electronic differential;

[0045] The flat-plate fuse T4 is also connected to the electromagnetic power main switch 6, and the electromagnetic power main switch 6 is respectively connected to the chip fuses F6, F7, F14-F20, the chip fuse F6 is connected to the vehicle body ignition switch, the chip fuses F7, F14, F15, F17, F18, and F20 are spare fuses, the chip fuse F16 is connected to the front compartment cooling relay 4, the front compartment cooling relay 4 is connected to the front compartment cooling controller and the front compartment radiator, the chip fuse F19 is connected to the rear compartment cooling relay 5, and the rear compartment cooling relay 5 is connected to the rear compartment cooling controller and the rear compartment radiator;

[0046] The flat-plate fuse T4 is connected to the mechanical power main switch 9, the mechanical power main switch 9 is connected to the low-voltage battery 7, the line side between the low-voltage battery 7 and the mechanical power main switch 9 is connected to the second A+ relay 3 through the 5A fuse, and is connected to the first A+ relay 2 through the 40A fuse, the low-voltage battery 7 line on the mechanical power main switch 9 side is connected to the first A+ relay 2 through the flat-plate fuse T1, and is connected to the charging wake-up relay 1 through the chip fuse F9, and the charging wake-up relay 1 is respectively connected to the vehicle body VCU, instrument BMS, TBOX, and DC / DC in the four-in-one high-voltage integrated controller.

[0047] See also Figure 3 As shown: the distribution box is also integrated with 4-way waterproof honeycomb plug-ins J, K, M, and N, through which the distribution box and the wiring harnesses of the vehicle body are connected.

[0048] The outer cover is opened by flipping up, the shell is made of nylon flame retardant material, the outer cover is transparent, and the circuit function diagram is printed on the outer cover. Both ends of the honeycomb plug-in are provided with line number markings to prevent wrong line insertion.

[0049] Example 2

[0050] Electromagnetic main power switch delays power off

[0051] After the driver turns off the ignition switch and presses the electromagnetic power main switch, the electromagnetic power main switch will give the rear module a bottom switch value (with a wake-up function, which controls it to enter the working state through the "ON" signal of the ignition switch). The rear module will delay for 5 seconds to cut off the control line of the electromagnetic power main switch to reserve time for the storage of the vehicle system.

[0052] Example 3

[0053] Mechanical main power switch is disconnected (see Figure 5 )

[0054] 1) When charging

[0055] The charging pile is connected to the high-voltage power battery 8, and at the same time, a 12V power supply is provided to the first A+ relay 2 and the second A+ relay 3, and the normally open contacts "30, 87" of the two relays are closed, thereby stimulating the low-voltage battery 7 to work;

[0056] Source of wake-up power supply: The current of low-voltage battery 7 flows into the second A+ relay 3 after passing through the 5A fuse. Since the normally open contacts "30, 87" of the second A+ relay 3 are closed, the current continues to pass through the normally closed contacts "30, 87a" of the charging wake-up relay 1. Since the mechanical power main switch 9 is in the disconnected state, the normally closed contacts "30, 87a" of the charging wake-up relay 1 are still in the closed state. Therefore, the charging wake-up relay 1 can provide current to the wake-up battery charging module of VCU, instrumentation, BMS, TBOX, DC / DC and high-voltage power battery 8, so that they enter the charging wake-up state;

[0057] Source of working power supply: The current of low-voltage battery 7 flows into the first A+ relay 2 after passing through 40A fuse. Since the mechanical power main switch 9 is in the disconnected state, the normally closed contacts "30, 87a" of the first A+ relay 2 are still in the closed state, so the current flows into VCU, instrument, BMS, TBOX, DC / DC through the normally closed contacts of the first A+ relay 2, making them enter the working state;

[0058] Charging: Since the wake-up battery charging module has been awakened, the charging mode can be entered; in addition, since the DC / DC has been awakened and is in working state, the DC / DC can output a voltage of 27.5V to charge the low-voltage battery 7. At the same time, the working power supply of the VCU, instrument, BMS, TBOX, and DC / DC is also switched to be powered by the DC / DC.

[0059] When the main mechanical power switch is disconnected, the charging pile can charge the high-voltage power battery 8 and the low-voltage battery 7. In addition, except for the low-voltage components that need to be awakened as mentioned above, other components are in a non-working state and do not consume power because the main mechanical power switch is disconnected.

[0060] 2) When not charging

[0061] Since the charging pile is not connected to the high-voltage power battery 8, the first A+ relay 2 and the second A+ relay 3 do not receive the 12V power supply, the normally open contacts "30, 87" of the two relays are in the disconnected state, the low-voltage battery 7 is not stimulated and will not supply power, so the entire vehicle does not consume power.

[0062] Example 4

[0063] Mechanical main power switch closed (see Figure 5 )

[0064] 1) When charging

[0065] The charging pile is connected to the high-voltage power battery 8, and a 12V power supply is provided to the first A+ relay 2 and the second A+ relay 3, and the normally open contacts "30, 87" of the two relays are closed;

[0066] Source of wake-up power supply: The current of low-voltage battery 7 flows into the second A+ relay 3 after passing through the sheet fuse F9. Since the normally open contacts "30, 87" of the second A+ relay 3 are closed, the current continues to pass through the normally closed contacts "30, 87a" of the charging wake-up relay 1. Since the mechanical power main switch 9 is in the closed state, the normally closed contacts "30, 87a" of the charging wake-up relay 1 are in the open state. Therefore, the charging wake-up relay 1 is not enough to provide current to the wake-up battery charging module of the VCU, instrumentation, BMS, TBOX, DC / DC and high-voltage power battery 8, and cannot make them enter the charging wake-up state;

[0067] Source of working power supply: The current of low-voltage battery 7 flows into the first A+ relay 2 after passing through the flat-plate fuse T1. Since the normally open contacts "30, 87" of the first A+ relay 2 are closed, the current flows into VCU, instrument, BMS, TBOX, DC / DC through the normally open contacts of the first A+ relay 2, making them enter the working state;

[0068] Charging: Since the wake-up battery charging module is not awakened, the high-voltage power battery 8 cannot enter the charging mode.

[0069] When the mechanical power main switch is turned off, the charging pile cannot charge the high-voltage power battery 8 and the low-voltage storage battery 7, and the entire vehicle is in a normal working state.

[0070] 2) When not charging

[0071] The current from the low-voltage battery 7 flows through the flat-plate fuse T1 and then flows into the first A+ relay 2. Since the mechanical power main switch 9 is in a closed state, the normally open contacts "30, 87" of the first A+ relay 2 are in a closed state. Therefore, the current flows into the VCU, instrument, BMS, TBOX, and DC / DC through the normally open contacts of the first A+ relay 2, putting them into working state.

Claims

1. A charging method for a new energy bus, characterized in that: The following steps are involved: Step S1: Turn off the main mechanical power switch; Step S2: Connecting the high-voltage power battery provided on the vehicle body to the charging pile; Step S3: The charging pile provides 12V power to the first A+ relay and the second A+ relay at the same time, and the normally open contacts "30, 87" of the two relays are closed; the mechanical power main switch is connected to the low-voltage battery, and the line side between the low-voltage battery and the mechanical power main switch is connected to the second A+ relay through a 5A fuse and to the first A+ relay through a 40A fuse; Step S4: stimulating the low-voltage battery to work; Step S51: The low-voltage battery current flows into the second A+ relay after passing through the 5A fuse. Since the normally open contacts "30, 87" of the second A+ relay are in a closed state, the current flows to the charging wake-up relay at this time. Since the mechanical power main switch is in an open state, the normally closed contacts "30, 87a" of the charging wake-up relay are still in a closed state, so the charging wake-up relay supplies current to the VCU, instrumentation, BMS, TBOX, DC / DC and the wake-up battery charging module of the high-voltage power battery, so that they enter the charging wake-up state; Step S52: After the low-voltage battery current passes through the 40A fuse, it flows into the first A+ relay. Since the mechanical power main switch is in the off state, the normally closed contacts "30, 87a" of the first A+ relay are still in the closed state, so the current flows into the VCU, instrument, BMS, TBOX, and DC / DC through the normally closed contacts of the first A+ relay, making them enter the working state; Step S6: Since the wake-up battery charging module has been awakened, the high-voltage power battery enters the charging mode; Step S7: Since the DC / DC has been awakened and is in working state, the DC / DC can output a voltage of 27.5V to charge the low-voltage battery. At the same time, the working power supply of the VCU, instrument, BMS, TBOX, and DC / DC is also switched to be powered by the DC / DC.

2. According to claim 1, a power distribution box for a charging method for a new energy bus comprises a housing and an outer cover arranged on the housing, characterized in that: It also includes 20-way chip fuses F1-F20, 9-way flat-plate fuses T1-T9, and 5 relays integrated inside the housing, namely, a charging wake-up relay, a first A+ relay and a second A+ relay capable of receiving 12V power from a charging pile, a front compartment cooling relay, a rear compartment cooling relay, and an electromagnetic power main switch; Among them, the flat-plate fuse T4 is connected to the flat-plate fuses T1, T2, T3, T5, and T6 respectively, the flat-plate fuse T1 is connected to the normally closed contact of the first A+ relay, the first A+ relay is connected to the chip fuses F1-F5 respectively, the chip fuse F1 is connected to the vehicle body instrument, the chip fuse F2 is connected to the vehicle body VCU, the chip fuse F3 is connected to the vehicle body BMS, the chip fuse F4 is connected to the vehicle body four-in-one high-voltage integrated controller, and the chip fuse F5 is connected to the vehicle body TBOX; the flat-plate fuse T2 is a spare fuse, the flat-plate fuse T3 is connected to the vehicle body rear module, the flat-plate fuse T5 is connected to the vehicle body dual-source steering pump, and the flat-plate fuse T6 is connected to the vehicle body front fuse box; The flat-plate fuse T4 is connected to the chip fuses F8-F13 respectively, the chip fuse F8 is connected to the vehicle body IC card and the proximity switch, the chip fuse F9 is connected to the charging wake-up relay, the chip fuses F10 and F13 are backup fuses, the chip fuse F11 is connected to the vehicle body motor controller, and the chip fuse F12 is connected to the vehicle body electronic differential; The flat-plate fuse T4 is also connected to the electromagnetic power main switch, and the electromagnetic power main switch is connected to the chip fuses F6, F7, F14-F20 respectively. The chip fuse F6 is connected to the vehicle body ignition switch. The chip fuses F7, F14, F15, F17, F18, and F20 are spare fuses. The chip fuse F16 is connected to the front compartment cooling relay, and the front compartment cooling relay is connected to the front compartment cooling controller and the front compartment radiator. The chip fuse F19 is connected to the rear compartment cooling relay, and the rear compartment cooling relay is connected to the rear compartment cooling controller and the rear compartment radiator. The flat-plate fuse T4 is connected to the mechanical power main switch. The low-voltage battery circuit on the mechanical power main switch side is connected to the first A+ relay through the flat-plate fuse T1 and to the charging wake-up relay through the chip fuse F9. The charging wake-up relay is respectively connected to the body VCU, instrument BMS, TBOX, and DC / DC in the four-in-one high-voltage integrated controller.

3. A power distribution box according to claim 2, characterized in that: The distribution box is also integrated with 4-way waterproof honeycomb plug-ins J, K, M, and N, through which the distribution box and the wiring harnesses of the vehicle body are connected.

4. A power distribution box according to claim 2, characterized in that: The outer cover is opened in a flip-up manner.

5. A power distribution box according to claim 2, characterized in that: The shell is made of nylon flame retardant material.

6. A power distribution box according to claim 2, characterized in that: The outer cover is transparent and has a circuit function diagram printed on it.

7. A power distribution box according to claim 3, characterized in that: Both ends of the waterproof honeycomb plug-in are provided with line number markings to prevent wrong line insertion.

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