CN-115610212-B - Pure electric mining alternating current dump truck driving system with modularized power battery

Abstract

The invention relates to a pure electric transmission dumper power battery modular configuration with power batteries capable of being configured in a modularized way, which comprises a whole vehicle controller, an external power supply access system, a variable frequency driving system, a vehicle auxiliary operation system and a power system which are electrically connected in sequence, wherein the whole vehicle controller monitors the running states of the power system, the variable frequency driving system, the external power supply access system and the vehicle auxiliary operation system in real time through a CAN communication bus, and sends control instructions to the systems according to operation instructions of drivers and the states of the systems so as to enable the systems to work cooperatively.

Inventors

• ZHANG XIAOQIANG
• WANG QIAN
• LIU MING
• YANG SHAOBO
• QIU ZENGHUA
• SUN WEIYANG

Assignees

• 湘电重型装备有限公司

Dates

Publication Date

20260508

Application Date

20221026

Claims (3)

1. 1. The driving system of the pure electric mining alternating current dump truck with the modularized configuration power battery comprises a whole vehicle controller and is characterized by comprising an external power supply access system, a variable frequency driving system, a vehicle auxiliary operation system and a power system which are electrically connected in sequence, wherein the whole vehicle controller monitors the running states of the power system, the variable frequency driving system, the external power supply access system and the vehicle auxiliary operation system in real time through a CAN communication bus, and sends control instructions to the systems according to the operation instructions of a driver and the states of the systems so as to enable the systems to work cooperatively; The power system comprises a plurality of power sub-modules, wherein each sub-module consists of a power battery pack, a battery thermal management system, a battery high-voltage power distribution cabinet and bidirectional DCDC, the whole vehicle controller has an energy management function, and the whole vehicle controller controls the discharge power of each set of bidirectional DCDC according to the SOC of each battery pack when a vehicle runs, so that the purpose that the residual electric quantity of each battery pack is equal in the discharge process is finally achieved; The variable frequency driving system consists of a braking resistor box, a left wheel traction frequency converter, a right wheel traction frequency converter, a left wheel traction motor and a right wheel traction motor; the auxiliary operation system of the vehicle consists of an auxiliary power supply, a hydraulic oil pump motor, an oil pump motor driver, a whole vehicle thermal management system, a 24V low-voltage power supply system and a cabin air conditioning system, wherein the auxiliary power supply reduces the high-voltage power supply into a low-voltage power supply and releases the low-voltage power supply on a low-voltage bus, and the oil pump motor driver, the whole vehicle thermal management system, the 24V low-voltage power supply system, the cabin air conditioning system and the battery thermal management system are powered by the low-voltage bus; The output end of the external power supply access system is also a high-voltage bus, and an external power supply is connected to the high-voltage bus; The external power supply access system is in butt joint with an external power supply system through the vehicle-mounted power receiving interface, the whole vehicle controller can acquire connection state information of the vehicle-mounted power receiving interface and the external power supply system through the external voltage sensor, the vehicle-mounted power receiving interface temperature sensor and the vehicle-mounted power receiving interface sensor, and read external power supply system parameters through the external power supply system communication module to judge whether an external power supply can be started, if the external power supply can be started, the main negative contactor is firstly closed, the pre-charging circuit is then connected, and when the voltage of a high-voltage bus is slightly lower than that of the external power supply system, the external power supply access system is connected with the main positive contactor of the external power supply system, so that the high-voltage bus and the external power supply system are in electrical butt joint; the high-voltage bus is a physical connection entity of each system, and the power system releases energy to the high-voltage bus to provide a power supply for the variable-frequency driving system and the auxiliary operation system of the vehicle; the whole vehicle controller has an energy management function, calculates the electric quantity of each battery pack by collecting the SOC of each battery pack, and controls the discharge power of the bidirectional DCDC according to the electric quantity when the vehicle is towed, so that the purpose that the SOC of each battery pack is equal in the discharge process is finally achieved.
2. 2. The driving system of the pure electric mining alternating current dump truck with the modularized power battery according to claim 1, wherein the braking resistor box, the left wheel traction frequency converter and the right wheel traction frequency converter are mounted on a high-voltage bus, the left wheel traction frequency converter and the right wheel traction frequency converter respectively drive a left wheel traction motor and a right wheel traction motor to rotate when the vehicle is in traction to drive the vehicle to advance, and the left wheel traction motor and the right wheel traction motor are converted into generators when the vehicle is in electric braking to convert kinetic energy of the vehicle into electric energy, and the electric energy is rectified by the left wheel traction frequency converter and the right wheel traction frequency converter and then released to the high-voltage bus.
3. 3. The driving system of the pure electric mining alternating current dump truck with the modularized power battery according to claim 1, wherein the output end of the bidirectional DCDC of each power battery submodule is connected in parallel to a high-voltage bus of the whole truck, and the rated voltage of the high-voltage bus can be unequal to the rated voltage of each power battery submodule.

Description

Pure electric mining alternating current dump truck driving system with modularized power battery Technical Field The invention relates to a pure electric mining alternating current dump truck driving system, in particular to a pure electric mining alternating current dump truck driving system with a modularized power battery. Background At present, the large mining dump truck with the load of 110t to 300t and above is widely applied to large open pit mining, water conservancy and hydropower facility construction and bears the transportation tasks of minerals and earthwork. The power source of the early large mining dump truck mainly uses a diesel engine as power, and the transmission mode of the vehicle mainly comprises two types of mechanical transmission in which the diesel engine drives the rear wheel to rotate through a gearbox, or electric transmission in which the diesel engine drives a generator to generate electricity and the electric energy drives the rear wheel to rotate. The diesel engine is used as a power source in any driving mode. In recent years, with the development of new energy industry, pure electric replacement of a mining dump truck power system with a load below 110t and 110t is realized, and pure electric replacement of the vehicle power system is difficult to realize on a large mining dump truck with a vehicle load above 110t and 300 t. The method is characterized in that (1) bus voltages of the large mining dump truck are above 1000V, the large mining dump truck can be realized at a great deal of cost in the current technical state of lithium batteries, and (2) the problem of battery pack voltage equalizing caused by direct parallel connection of the multi-branch batteries is difficult to solve, and the requirement of vehicle driving power cannot be met. Disclosure of Invention The invention aims to solve the technical problem of overcoming the defects of the prior art and providing a pure electric mining alternating current dump truck driving system with a modularized power battery. The technical scheme adopted by the invention for solving the technical problems is that the driving system of the pure electric mining alternating current dump truck with the modularized configuration of the power battery comprises a whole vehicle controller, an external power supply access system, a variable frequency driving system, a vehicle auxiliary operation system and a power system which are electrically connected in sequence, wherein the whole vehicle controller monitors the running states of the power system, the variable frequency driving system, the external power supply access system and the vehicle auxiliary operation system in real time through a CAN communication bus, and sends control instructions to the systems according to the operation instructions of a driver and the states of the systems so as to enable the systems to work cooperatively; The power system is composed of a plurality of power sub-modules, each sub-module is composed of a power battery pack, a battery thermal management system, a battery high-voltage power distribution cabinet and a bidirectional DCDC, the power system can be configured according to different requirements of pure electric mining dump trucks with different loads on electric quantity and power, and each power sub-module can be different from other power battery sub-modules in battery type and battery rated voltage level. The whole vehicle controller has the energy management function, and controls the discharge power of the bidirectional DCDC according to the SOC of each battery pack when the vehicle runs, so as to finally achieve the purpose that the residual electric quantity of each battery pack is equal in the discharge process; The variable frequency driving system consists of a braking resistor box, a left wheel traction frequency converter, a right wheel traction frequency converter, a left wheel traction motor and a right wheel traction motor; the auxiliary operation system of the vehicle consists of an auxiliary power supply, a hydraulic oil pump motor, an oil pump motor driver, a whole vehicle thermal management system, a 24V low-voltage power supply system and a cabin air conditioning system, wherein the auxiliary power supply reduces the high-voltage power supply into a low-voltage power supply and releases the low-voltage power supply on a low-voltage bus, and the oil pump motor driver, the whole vehicle thermal management system, the 24V low-voltage power supply system, the cabin air conditioning system and the battery thermal management system are powered by the low-voltage bus; the output end of the external power supply access system is also a high-voltage bus, and the external power supply is accessed to the high-voltage bus. The external power supply access system is in butt joint with the external power supply system through the vehicle-mounted power receiving interface, the whole vehicle controller acquires connection state inform