Multi-loop output mining new energy vehicle power supply device

Abstract

The invention belongs to the technical field of coal mine underground new energy vehicles, and particularly relates to a multi-loop output mining new energy vehicle power supply device and method. The mining new energy vehicle power supply device overcomes the defects of an existing mining new energy vehicle power supply device, simplifies configuration of an electric control system of a mining new energy vehicle and the number of electric control boxes, and comprises a power battery, the power battery outputs a high-voltage power supply outwards through multiple paths of high-voltage output loops, and the high-voltage output loops are provided with current limiting protection devices; and the power battery outputs a low-voltage control power supply to the outside through the DC / DC voltage change device.

Description

Technical Field

[0001] The present invention belongs to the technical field of new energy vehicles in coal mines, and specifically is a power supply device for a new energy vehicle for mines with multi-circuit output. Background Art

[0002] With the development of power battery safety technology and electric power technology, mining new energy vehicles have gradually emerged in the 21st century. Compared with traditional diesel engine mining vehicles, mining new energy vehicles have the characteristics of "high efficiency, good performance, clean and pollution-free". At present, the mining power supply devices in the three-electric system of mining new energy vehicles are designed with a high-voltage output port. Since the electrical system of mining new energy vehicles is generally composed of multiple flameproof electric control boxes, and multiple electric control boxes need to be powered by mining power supply devices, when the number of electric control boxes that need to be powered by mining power supply devices is greater than the number of high-voltage output circuits that can be provided by mining power supply devices, it is necessary to design a dedicated power distribution electric control box (PDU box for short) to meet the electrical system requirements, which will lead to an increase in the number of electric control boxes in the electric control system of mining new energy vehicles, and at the same time increase the overall cost of the electrical system.

[0003] In terms of voltage level, the current power supply device for new energy vehicles used in mines only provides high-voltage power supply, while the low-voltage power supply (such as DC24V) used for the electronic control system of the whole vehicle still requires an additional backup power supply. At the same time, since the capacity of the backup power supply is relatively small, and the capacity of the low-voltage control power supply required for the operation of the whole vehicle is much larger than the capacity of the backup power supply, it is necessary to add a DC / DC power supply device for generating low-voltage control power supply to the electronic control system of new energy vehicles used in mines. The DC / DC power supply device used in mines also requires an explosion-proof electric control box to protect its safety. Similarly, the external use of DC / DC will also lead to an increase in the number of electric control boxes in the electric control system of new energy vehicles used in mines, an increase in costs, and at the same time bring difficulties to the layout of the whole vehicle.

[0004] The existing mining power supply devices with a single power voltage output and no control voltage output capability will lead to the presence of PDU boxes and DC / DC boxes in the electric control system of mining new energy vehicles, making the electrical system complicated and increasing the cost of the electric control system of mining new energy vehicles. Therefore, it is necessary to make functional improvements to the mining new energy power supply devices in use according to actual needs, so as to improve the practicality of the mining power supply devices. Summary of the invention

[0005] In order to solve the shortcomings of the existing power supply device for new energy mining vehicles, the present invention simplifies the configuration of the electric control system of the new energy mining vehicle and the number of electric control boxes, indirectly or directly reduces the dead weight of the new energy mining vehicle, increases the load capacity of the new energy mining vehicle and increases the cruising range of the new energy mining vehicle, and provides a power supply device for new energy mining vehicles with multiple circuit outputs.

[0006] The present invention adopts the following technical solution: a multi-circuit output power supply device for mining new energy vehicles, comprising: A power battery, wherein the power battery outputs a high-voltage power supply to the outside through a plurality of high-voltage output circuits, and the high-voltage output circuits are provided with a current limiting protection device; the power battery outputs a low-voltage control power supply to the outside through a DC / DC voltage changing device; A control unit is used to control the power battery to supply power to the outside.

[0007] In some embodiments, a high-voltage DC relay K1 is connected in series on the high-voltage input side of the DC / DC voltage conversion device. When the power battery is in a dormant state, the control unit cuts off the coil voltage of the high-voltage DC relay K1, thereby stopping the power supply device from supplying power to the DC / DC to reduce the power consumption of the DC / DC voltage conversion device. When the power battery is in the awake state, a DC / DC start command is sent to the control unit; upon receiving the DC / DC start command, the control unit controls the high-voltage DC relay K1 to close, the battery high-voltage circuit supplies power to the DC / DC, and the DC / DC module starts to output a low-voltage control power supply.

[0008] In some embodiments, the current limiting protection device comprises: A main circuit high-voltage relay KA1, wherein the front stage of the main circuit high-voltage relay KA1 is connected to the positive electrode of the battery, the rear stage of the main circuit high-voltage relay KA1 is connected to the wiring terminal J1, and the main circuit high-voltage relay KA1 is controlled by a control unit; The current limiting protection high-voltage relay KA2 is connected in series with the current limiting resistor RA1 and then connected in parallel with the main circuit high-voltage relay KA1. The current limiting protection high-voltage relay KA2 is controlled by the control unit.

[0009] In some embodiments, when the power battery is in the awake state, the vehicle controller sends a high-voltage circuit output command to the control unit. After receiving the high-voltage circuit output command, the control unit simultaneously detects the voltage U before the main circuit high-voltage relay KA1. 1前 And the post-amplifier 1后 ; If U 1前 DC If the power supply fails, U DC It is the battery voltage of the power supply device of the mining new energy vehicle; the control unit sends the fault information to the vehicle controller; If U 1前 =U DC AndU 1后 =U DC If the current limiting unit fails, the control unit sends the fault information to the vehicle controller;​ If U 1前 =U DC AndU 1后 =0V, the control unit will control the current limiting protection high-voltage relay KA2 to close.

[0010] In some embodiments, after the current limiting protection high voltage relay KA2 is closed, the control unit continuously detects the voltage of the front stage and the rear stage of the current limiting protection high voltage relay KA2; If U 1前 =U DC AndU 1后 =0V, the current limiting circuit fails, and the control unit sends the fault information to the vehicle controller; If U 1前 =U DC AndU 1后 >0V, the current limiting unit works normally, and the control unit continuously detects the voltage of the front and rear stages of the main circuit high-voltage relay KA1.

[0011] In some embodiments, after a delay of 1 second, the control unit compares U 1前 and U 1后 The voltage when U 1后 >=αU 1前 When α is the charging constant, the control unit controls the main circuit high-voltage relay KA1 to close, and at the same time controls the current limiting protection high-voltage relay KA2 to open.

[0012] In some embodiments, an explosion-proof box is included, the explosion-proof box comprising: A main chamber, wherein a power battery, a battery management unit, a DC / DC voltage change device, multiple high-voltage output circuits and a current limiting protection device are arranged in the main chamber; A wiring chamber, wherein the wiring chamber is provided with an introduction device for connecting to the outside and allowing multiple high-voltage outputs; A wiring terminal allowing multi-channel high voltage output is arranged between the wiring chamber and the main chamber.

[0013] In some embodiments, the wiring cavity is provided with two or more lead-in devices for connecting high-voltage cables, and is also provided with one or more lead-in devices for connecting low-voltage cables.

[0014] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention provides a power supply device for a mining new energy vehicle with a multi-circuit output. The wiring cavity thereof is designed with an introduction device for a multi-channel high-voltage power supply and a wiring terminal for electrical connection designed to realize the multi-channel high-voltage power supply output. The power supply device of the present invention realizes that the power supply device directly supplies power to the electric control box, saves the use of the PDU electric control box, and reduces the cost of the electric control system of the mining new energy vehicle.

[0015] 2. The present invention provides a power supply device for a mining new energy vehicle with low-voltage output capability, which can output a low-voltage power supply used for low-voltage control of the entire mining new energy vehicle, saving the on-board DC / DC device.

[0016] 3. In the present invention, a current limiting protection device is configured for each high-voltage output circuit in the main cavity of the power supply device, which can greatly reduce the transient peak current at the output of the power supply device and protect the power supply device to work reliably and safely. At the same time, a control relay is provided in the front stage of the DC / DC high-voltage input in the main cavity. The operation of the DC / DC is controlled by controlling the on and off of the control relay, thereby reducing the no-load power consumption of the DC / DC and reducing the ineffective loss of the power supply device. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A schematic diagram of a multi-circuit output mining new energy vehicle power supply device provided by an embodiment of the present invention Figure 1 ; Figure 2 A schematic diagram of a multi-circuit output power supply device for a mining new energy vehicle provided by an embodiment of the present invention Figure 2 ; Figure 3 A schematic diagram of an introduction device for a multi-circuit output power supply device for a mining new energy vehicle provided by an embodiment of the present invention; Figure 4 A schematic diagram of a wiring terminal of a wiring cavity of a power supply device for a mining new energy vehicle with multi-circuit output provided by an embodiment of the present invention; Figure 5 A DC / DC control principle diagram of a multi-circuit output power supply device for a mining new energy vehicle provided by an embodiment of the present invention; Figure 6 An electrical schematic diagram of a current limiting protection device for the first high-voltage output circuit of a multi-circuit output mining new energy vehicle power supply device provided by an embodiment of the present invention; Figure 7 A control flow chart of a current limiting control unit of a high-voltage output circuit of a mining new energy vehicle power supply device with multiple circuit outputs provided by an embodiment of the present invention; In the figure: 1- explosion-proof box of mining power supply, 2- main chamber door I, 3- main chamber door II, 4- main chamber door III, 5- main chamber door IV, 6- main chamber door V, 6- wiring chamber door, 7- main chamber I, 8- main chamber II, 9- main chamber III, 10- main chamber IV, 11- wiring chamber, B11- first high-voltage circuit output introduction device, B12- second high-voltage circuit output introduction device, B13- low-voltage DC24V output introduction device, B14- low-voltage DC24V output introduction device, J1- first high-voltage circuit positive terminal, J2- first high-voltage circuit negative terminal, J3- second high-voltage circuit positive terminal, J4- second high-voltage circuit negative terminal, J5- low-voltage DC24V output and control signal line terminal I, J6- low-voltage DC24V output and control signal line terminal II, B14- low-voltage DC24V output introduction device. DETAILED DESCRIPTION

[0018] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all the embodiments; based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0019] like Figure 1 , Figure 2 As shown, an embodiment of the present invention provides a multi-circuit output power supply device for a mining new energy vehicle, including an explosion-proof box, which is composed of a plurality of cavities, each of which has its own independent cavity door, and the cavity and the cavity door are formed by machining and welding of steel or materials allowed in coal mines, and the cavity is divided into a wiring cavity and a main cavity, and the wiring cavity and the main cavity are electrically connected through explosion-proof wiring terminals, and the wiring cavity is used for cable matching, and the main cavity is provided with a power battery, a DC / DC voltage conversion unit, and an output circuit current limiting protection device.

[0020] In this embodiment, a multi-circuit output power supply device for a mining new energy vehicle is provided in the embodiment of the present invention. The output circuit specifically refers to that the mining power supply device has two high-voltage output circuits, and further refers to that two sets of high-voltage circuit output current limiting protection devices are configured in the main cavity of the power supply device, and at the same time, the wiring cavity of the power supply device is configured as follows Figure 3The B11 and B12 shown in the figure are used to connect the B2 introduction device of the high-voltage cable to transmit the high-voltage power supply, wherein the B11 is used for the first high-voltage output circuit, and the B12 is used for the second high-voltage output circuit; the power supply device in this embodiment can output high voltage and DC24V low voltage at the same time, which further means that the main cavity of the power supply device is equipped with a DC / DC voltage conversion device, and the wiring cavity of the power supply device is equipped with Figure 3 The two A1 lead-in devices B13 and B14 shown are used to distribute the DC24V power transmitted by the low-voltage cable.

[0021] In this embodiment, a multi-circuit output power supply device for a mining new energy vehicle is provided, and a wiring cavity and a main cavity of the power supply device are provided as follows: Figure 4 The mining explosion-proof terminal blocks for electrical connection shown are divided into high-voltage terminal blocks and low-voltage terminal blocks. The high-voltage terminal blocks in this embodiment specifically refer to JF12-1140 terminal blocks. In this embodiment, J1, J2, J3, and J4 are configured between the wiring chamber and the main chamber, and a total of 4 JF12-1140 terminal blocks are configured. The two terminal blocks J1 and J2 are used for the first high-voltage circuit output matching cable. J1 is matched with the positive pole of the first high-voltage circuit output current limiting protection device, and J2 is matched with the negative pole of the first high-voltage circuit output current limiting protection device. Further, the two terminal blocks J3 and J4 are used for the second high-voltage circuit output matching cable. J3 is matched with the positive pole of the second high-voltage circuit output current limiting protection device, and J4 is matched with the negative pole of the second high-voltage circuit output current limiting protection device. The low-voltage terminal blocks in this embodiment specifically refer to JD9-220 terminal blocks. In this embodiment, J5 and J6 are configured between the wiring chamber and the main chamber, and the J5 terminal block is used for the low-voltage power supply output matching cable.

[0022] In this embodiment, a multi-circuit output power supply device for a mining new energy vehicle is provided, wherein the main chamber is provided with a DC / DC voltage conversion device, and the control principle of the DC / DC voltage conversion device is as follows: Figure 5 As shown, a high-voltage DC relay K1 is connected in series on the high-voltage input side of the DC / DC voltage conversion device. When the power supply device is in a dormant state, the control unit ICA cuts off the coil voltage of the high-voltage DC relay K1, thereby stopping the power supply device from supplying power to the DC / DC to reduce the power consumption of the DC / DC voltage conversion device. Further, when the power supply device is in an awake state, the control unit ICA supplies power to the high-voltage DC relay K1 to control the high-voltage relay to close, and the DC / DC high-voltage power is supplied while the DC / DC low-voltage DC24V is output.

[0023] In this embodiment, a multi-circuit output power supply device for a mining new energy vehicle is provided. The main chamber is equipped with a current limiting protection device for two high-voltage output circuits. The electrical schematic diagram of the current limiting protection device is as follows: Figure 6 As shown, the current limiting protection device includes: an ICA control unit, a main circuit high-voltage relay KA1, a current limiting resistor RA1, and a current limiting protection high-voltage relay KA2. The current limiting protection high-voltage relay KA2 is connected in series with the current limiting resistor RA1, and the non-series end of the current limiting protection high-voltage relay is short-circuited with the rear stage of the main circuit high-voltage relay KA1. The non-series end of the current limiting resistor RA1 is short-circuited with the front stage of the main circuit high-voltage relay KA1. The front stage of the main circuit high-voltage relay KA1 is connected to the positive electrode of the battery, and the rear stage of the main circuit high-voltage relay KA1 is connected to the wiring terminal J1. Further, its control method is as follows: When the power battery is in the awake state, the vehicle controller (VCU) sends the first high-voltage circuit output command to the control unit ICA through communication. After receiving the first high-voltage circuit output command, the control unit ICA simultaneously detects the front-stage voltage U of the first high-voltage DC relay KA1. 1前 And the post-amplifier 1后 , if U 1前 DC If the power supply fails, U DC Refers to the battery voltage of the power supply device of the mining new energy vehicle. The control unit ICA sends the fault information to the vehicle controller (VCU) through communication. If U 1前 =U DC AndU 1后 =U DC If the first current limiting unit fails, the control unit ICA sends the fault information to the vehicle control unit (VCU) through communication; If U 1前 =U DC AndU 1后 =0V, the control unit ICA will control the first circuit current limiting resistor relay KA2 to close, and the control unit ICA will continue to detect the voltage of the front and rear stages of the first circuit high-voltage DC relay KA1. 1前 =U DC AndU 1后 =0V, the current limiting circuit is faulty, and the control unit ICA sends the fault information to the vehicle control unit (VCU) through communication. 1前 =U DC AndU 1后 >0V, the current limiting unit works normally, and the control unit continuously detects the voltage of the front and rear stages of the first circuit high-voltage DC relay KA1.

[0024] After a delay of 1 second, the control unit compares U​1前 and U 1后 The voltage when U 1后 >=αU 1前 When the control unit ICA controls the first circuit high-voltage DC relay KA1 to close, and controls the first circuit current limiting circuit relay KA2 to open. (where α is the charging constant, the range is 0<α<=1, and it can be selected according to actual needs in actual use). The execution method and logic of other high-voltage output circuits are the same as those of the first high-voltage circuit.

[0025] The electrical principle and control method of the current limiting protection device of the second high-voltage output circuit in this embodiment are similar to the electrical principle and control method of the current limiting protection device of the first high-voltage output circuit.

[0026] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A multi-circuit output power supply device for mining new energy vehicles, characterized in that: include: A power battery, wherein the power battery outputs a high-voltage power supply to the outside through a plurality of high-voltage output circuits, and the high-voltage output circuits are provided with a current limiting protection device; the power battery outputs a low-voltage control power supply to the outside through a DC / DC voltage changing device; A control unit is used to control the power battery to supply power to the outside.

2. The multi-circuit output power supply device for mining new energy vehicles according to claim 1 is characterized in that: A high-voltage DC relay K1 is connected in series on the high-voltage input side of the DC / DC voltage conversion device. When the power battery is in a dormant state, the control unit cuts off the coil voltage of the high-voltage DC relay K1, thereby stopping the power supply device from supplying power to the DC / DC to reduce the power consumption of the DC / DC voltage conversion device. When the power battery is in the awake state, a DC / DC start command is sent to the control unit; upon receiving the DC / DC start command, the control unit controls the high-voltage DC relay K1 to close, the battery high-voltage circuit supplies power to the DC / DC, and the DC / DC module starts to output a low-voltage control power supply.

3. The multi-circuit output power supply device for mining new energy vehicles according to claim 1 is characterized in that: The current limiting protection device comprises: A main circuit high-voltage relay KA1, wherein the front stage of the main circuit high-voltage relay KA1 is connected to the positive electrode of the battery, the rear stage of the main circuit high-voltage relay KA1 is connected to the wiring terminal J1, and the main circuit high-voltage relay KA1 is controlled by a control unit; The current limiting protection high-voltage relay KA2 is connected in series with the current limiting resistor RA1 and then connected in parallel with the main circuit high-voltage relay KA1. The current limiting protection high-voltage relay KA2 is controlled by the control unit.

4. The multi-circuit output power supply device for mining new energy vehicles according to claim 3 is characterized in that: When the power battery is in the awake state, the vehicle controller sends a high-voltage circuit output command to the control unit. After receiving the high-voltage circuit output command, the control unit simultaneously detects the voltage U before the main circuit high-voltage relay KA1. 1前 And the post-amplifier 1后 ; If U 1前 DC If the power supply fails, U DC It is the battery voltage of the power supply device of the mining new energy vehicle; the control unit sends the fault information to the vehicle controller;​ If U 1前 =U DC AndU 1后 =U DC If the current limiting unit fails, the control unit sends the fault information to the vehicle controller; If U 1前 =U DC And U 1后 =0V, the control unit will control the current limiting protection high-voltage relay KA2 to close.

5. The multi-circuit output power supply device for mining new energy vehicles according to claim 4 is characterized in that: After the current limiting protection high voltage relay KA2 is closed, the control unit continuously detects the voltage of the front and rear stages of the current limiting protection high voltage relay KA2; If U 1前 =U DC And U 1后 =0V, the current limiting circuit fails, and the control unit sends the fault information to the vehicle controller; If U 1前 =U DC And U 1后 >0V, the current limiting unit works normally, and the control unit continuously detects the voltage of the front and rear stages of the main circuit high-voltage relay KA1.

6. The multi-circuit output power supply device for mining new energy vehicles according to claim 5 is characterized in that: After a delay of 1 second, the control unit compares U 1前 and U 1后 The voltage when U 1后 >=αU 1前 When α is the charging constant, the control unit controls the main circuit high-voltage relay KA1 to close, and at the same time controls the current limiting protection high-voltage relay KA2 to open.

7. The multi-circuit output power supply device for mining new energy vehicles according to claim 1 or 2 or 3 or 4 or 5 or 6, characterized in that: An explosion-proof box is included, and the explosion-proof box includes: A main chamber, wherein a power battery, a battery management unit, a DC / DC voltage change device, multiple high-voltage output circuits and a current limiting protection device are arranged in the main chamber; A wiring chamber, wherein the wiring chamber is provided with an introduction device for connecting to the outside and allowing multiple high-voltage outputs; A wiring terminal allowing multi-channel high voltage output is arranged between the wiring chamber and the main chamber.

8. The multi-circuit output power supply device for mining new energy vehicles according to claim 7 is characterized in that: The wiring cavity is provided with two or more lead-in devices for connecting high-voltage cables, and is also provided with one or more lead-in devices for connecting low-voltage cables.

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