Driving system of pure electric mine dumper

Abstract

The utility model provides a pure electric mine dumper driving system. The pure electric mine dumper driving system comprises a first battery pack, a second battery pack, an SOC balancing device and power conversion equipment. The first battery pack is used for providing first power supply voltage for the power supply conversion equipment; the second battery pack is used for providing second power supply voltage for the power supply conversion equipment; the power supply conversion equipment is used for converting the first power supply voltage and / or the second power supply voltage so as to supply power to a load; the SOC balancing device is used for balancing the power supply voltage between the first battery pack and the second battery pack. According to the driving system of the pure electric mine dumper, the power voltage between the first battery pack and the second battery pack is balanced through the SOC balancing device, the electric quantity between the battery packs can be balanced, and the battery utilization rate is increased.

Description

Technical Field

[0001] The present application relates to the technical field of mining dump trucks, and in particular to a pure electric mining dump truck drive system. Background Art

[0002] The working environment of mining dump trucks is relatively harsh, with low temperature, high humidity and high altitude. The defects of diesel drive system are as follows: high fuel consumption and large air pollution; the diesel engine is not easy to start, and the energy generated by the electric wheel cannot be effectively used. Therefore, mining dump trucks are gradually moving towards pure electric.

[0003] In pure electric mining dump trucks, the battery pack needs to have a larger capacity. Often, the capacity of one battery pack cannot meet the application requirements, so multiple groups need to be used in parallel, and then the motor and other loads are driven by the inverter. However, when multiple groups are used in parallel, the balance of each group of batteries must be considered to avoid mismatching of the power between the battery groups, otherwise it is easy to reduce the battery utilization rate. Utility Model Content

[0004] The present application provides a pure electric mining dump truck drive system to balance the power between battery packs and improve battery utilization.

[0005] The present application provides a pure electric mining dump truck drive system, including a first battery pack, a second battery pack, a SOC balancing device, and a power conversion device;

[0006] The first battery pack is used to provide a first power supply voltage for the power conversion device; the second battery pack is used to provide a second power supply voltage for the power conversion device; the power conversion device is used to convert the first power supply voltage and / or the second power supply voltage to power a load;

[0007] The SOC balancing device is used to balance the power supply voltage between the first battery group and the second battery group.

[0008] In one example, the power conversion device includes a first input terminal connected to the first battery pack, and a second input terminal connected to the second battery pack;

[0009] The SOC balancing device includes a first end connected to the first input end and a second end connected to the second input end.

[0010] In one example, the SOC balancing device includes a first switch and a first resistor connected in series.

[0011] In one example, the power conversion device further includes a third input terminal, and the SOC balancing device further includes a third terminal connected to the third input terminal.

[0012] In one example, the SOC balancing device includes a second switch tube and a third switch tube, one end of the second switch tube forms the first end, one end of the third switch tube forms the second end, and the other end of the second switch tube is connected with the other end of the third switch tube to form the third end.

[0013] In one example, the second switch tube includes a first diode, the third switch tube includes a second diode, the anode of the first diode forms the first end, the anode of the second diode forms the second end, and the cathode of the first diode is connected with the cathode of the second diode to form the third end.

[0014] In one example, it further includes a first pre-charging loop and a second pre-charging loop;

[0015] The first battery pack is connected to the power conversion device via the first pre-charging circuit, and the second battery pack is connected to the power conversion device via the second pre-charging circuit.

[0016] In one example, the first pre-charging loop or the second pre-charging loop includes a fourth switch and a second resistor connected in parallel.

[0017] The pure electric mining dump truck drive system provided in the present application balances the power supply voltage between the first battery group and the second battery group through the SOC balancing device, which is beneficial to balancing the power between the battery groups and improving the battery utilization rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] One or more embodiments are exemplarily described by pictures in the corresponding drawings, and these exemplified descriptions do not constitute limitations on the embodiments. Elements with the same reference numerals in the drawings represent similar elements, and unless otherwise stated, the figures in the drawings do not constitute proportional limitations.

[0019] Figure 1 It is a schematic diagram of a pure electric mining dump truck driving system provided by an embodiment of the present application;

[0020] Figure 2 It is a schematic diagram of a SOC balancing device provided in one embodiment of the present application.

[0021] Figure 3 is a schematic diagram of a pre-charging circuit provided in one embodiment of the present application;

[0022] Figure 4 It is a schematic diagram of a pure electric mining dump truck driving system provided by another embodiment of the present application;

[0023] Figure 5 is a schematic diagram of a SOC balancing device provided in another embodiment of the present application;

[0024] Figure 6 It is a schematic diagram of another SOC balancing device provided in another embodiment of the present application. DETAILED DESCRIPTION

[0025] In order to facilitate the understanding of the present application, the present application is described in more detail below in conjunction with the accompanying drawings and specific embodiments. Unless otherwise defined, all technical and scientific terms used in this specification have the same meaning as those commonly understood by those skilled in the art of the present application. The terms used in this specification in the specification of the present application are only for the purpose of describing specific embodiments and are not used to limit the present application. The term "and / or" used in this specification includes any and all combinations of one or more related listed items.

[0026] Figure 1 It is a schematic diagram of a pure electric mining dump truck drive system provided in an embodiment of the present application.

[0027] like Figure 1 As shown, a pure electric mining dump truck driving system provided in an embodiment of the present application includes a battery pack 1, a battery pack 2, a SOC balancing device and a power conversion device;

[0028] The battery pack 1 is used to provide a first power supply voltage for the power conversion device; the battery pack 2 is used to provide a second power supply voltage for the power conversion device; the power conversion device is used to convert the first power supply voltage and / or the second power supply voltage to power the load;

[0029] The SOC balancing device is used to balance the power supply voltage between the battery pack 1 and the battery pack 2 .

[0030] The loads include but are not limited to the left traction motor, lifting motor, DC load, right traction motor, and steering motor in the figure. The DC loads include but are not limited to battery, battery cooling, air conditioning power supply, battery charging and other equipment.

[0031] The power conversion device comprises a first input terminal connected to the battery pack 1, and a second input terminal connected to the battery pack 2;

[0032] The SOC balancing device includes a first end connected to the first input end and a second end connected to the second input end.

[0033] like Figure 2 As shown, the SOC balancing device includes a first switch K11 and a first resistor R11 connected in series.

[0034] In one example, it also includes a pre-charging circuit 1 and a pre-charging circuit 2;

[0035] The battery pack 1 is connected to the power conversion device via the pre-charging circuit 1 , and the battery pack 2 is connected to the power conversion device via the pre-charging circuit 2 .

[0036] like Figure 3 As shown, the pre-charging loop 1 or the pre-charging loop 2 includes a fourth switch K21 and a second resistor R21 connected in parallel.

[0037] Figure 4 It is a schematic diagram of a pure electric mining dump truck drive system provided in another embodiment of the present application.

[0038] and Figure 1 The difference in the example is that Figure 4 In the example, the power conversion device further includes a third input terminal, and the SOC balancing device further includes a third terminal connected to the third input terminal.

[0039] like Figure 5 As shown, the SOC balancing device includes a second switch tube K31 and a third switch tube K32, one end of the second switch tube K31 forms the first end, one end of the third switch tube K32 forms the second end, and the other end of the second switch tube K31 is connected with the other end of the third switch tube K32 to form the third end.

[0040] like Figure 6 As shown, the second switch tube K31 includes a first diode D11, and the third switch tube K32 includes a second diode D12. The anode of the first diode D11 forms the first end, the anode of the second diode D12 forms the second end, and the cathode of the first diode D11 and the cathode of the second diode D12 are connected together to form the third end.

[0041] It should be noted that the preferred embodiments of the present application are given in the specification and drawings of the present application. However, the present application can be implemented in many different forms and is not limited to the embodiments described in the specification. These embodiments are not used as additional limitations on the content of the present application. The purpose of providing these embodiments is to make the understanding of the disclosure of the present application more thorough and comprehensive. In addition, the above-mentioned technical features continue to be combined with each other to form various embodiments not listed above, which are all regarded as the scope of the description of the present application; further, for ordinary technicians in this field, they can be improved or transformed according to the above description, and all these improvements and transformations should belong to the scope of protection of the claims attached to the present application.

Claims

1. A pure electric mining dump truck drive system, characterized in that: It includes a first battery pack, a second battery pack, a SOC balancing device and a power conversion device; The first battery pack is used to provide a first power supply voltage for the power conversion device; the second battery pack is used to provide a second power supply voltage for the power conversion device; the power conversion device is used to convert the first power supply voltage and / or the second power supply voltage to power a load; The SOC balancing device is used to balance the power supply voltage between the first battery group and the second battery group.

2. The pure electric mining dump truck driving system according to claim 1, characterized in that: The power conversion device includes a first input terminal connected to the first battery pack, and a second input terminal connected to the second battery pack; The SOC balancing device includes a first end connected to the first input end and a second end connected to the second input end.

3. The pure electric mining dump truck driving system according to claim 2, characterized in that: The SOC balancing device includes a first switch and a first resistor connected in series.

4. The pure electric mining dump truck driving system according to claim 2, characterized in that: The power conversion device further includes a third input terminal, and the SOC balancing device further includes a third terminal connected to the third input terminal.

5. The pure electric mining dump truck driving system according to claim 4, characterized in that: The SOC balancing device includes a second switch tube and a third switch tube, one end of the second switch tube forms the first end, one end of the third switch tube forms the second end, and the other end of the second switch tube is connected with the other end of the third switch tube to form the third end.

6. The pure electric mining dump truck driving system according to claim 5, characterized in that: The second switch tube includes a first diode, the third switch tube includes a second diode, the anode of the first diode forms the first end, the anode of the second diode forms the second end, and the cathode of the first diode is connected with the cathode of the second diode to form the third end.

7. The pure electric mining dump truck driving system according to claim 1, characterized in that: Also includes a first pre-charging circuit and a second pre-charging circuit; The first battery pack is connected to the power conversion device via the first pre-charging circuit, and the second battery pack is connected to the power conversion device via the second pre-charging circuit.

8. The pure electric mining dump truck driving system according to claim 7, characterized in that: The first pre-charging loop or the second pre-charging loop includes a fourth switch and a second resistor connected in parallel.

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