A mesh-shaped electric vehicle hybrid power supply device

Abstract

The invention belongs to the technical field of energy power and relates to a meshed hybrid power device for an electric vehicle. A first switch is connected with the positive electrode of a power generation device, and a third switch is connected with the negative electrode of a second energy storage device; the negative electrode of a first energy storage device is electrically connected with the positive electrode of the second energy storage device, the positive electrode of the first energy storage device is electrically connected with the negative electrode of the power generation device, the positive electrode of the first energy storage device is electrically connected with the direct current input positive electrode of a motor controller, and the negative electrode of the first energy storage device is electrically connected with the direct current input negative electrode of the motor controller; the output end of the motor controller is electrically connected with a driving motor; a direct current charging / discharging interface is connected with the second energy storage device; and an electronic control unit is respectively connected with the first energy storage device, the second energy storage device, the power generation device and the direct current charging / discharging interface, and the electronic control unit is respectively connected with the first switch, a second switch and the third switch. The device provided by the invention is simple in structure, reliable in principle, convenient in operation, long in service life, reasonable and efficient in power control, low in energy consumption and friendly to environment.

Description

[0001] Technical field: [0002] The invention belongs to the technical field of energy and power, and relates to a hybrid power supply device of a grid-shaped electric vehicle. Through the redistribution of power demand, the working states of different energy storage devices are optimally configured, so that each energy storage device can work as much as possible In the most suitable working conditions, realize the optimization of energy conversion or energy output efficiency, life, cost, reliability and other performance. [0003] Background technique: [0004] At present, the battery system of electric vehicles mainly uses lithium batteries. Although the ability of lithium batteries to adapt to the dynamic power requirements of vehicles is obviously better than that of engines, there are still deficiencies in the current commonly used overall battery pack structure, which is mainly reflected in the design of the battery pack. In terms of cost, life, capacity and other parame...

AI Technical Summary

Problems solved by technology

[0004] At present, the battery system of electric vehicles mainly uses lithium batteries. Although the ability of lithium batteries to adapt to the dynamic power requirements of vehicles is obviously better than that of engines, there are still deficiencies in the current commonly used overall battery pack structure, which is mainly reflected in the design of the battery pack. In terms of cost, life, capacity and other parameters, whether it is a hybrid vehicle or a pure electric vehicle, the battery pack needs to bear the dynamic part of the vehicle power demand, and the battery pack that directly provides energy for the drive motor often works at a large Dynamically changing working conditions, the battery in the existing single overall battery pack design structure must meet this dynamic power demand, and there is also a problem of optimal working conditions for lithium batteries

If the lithium battery pack of an electric vehicle is also of a hybrid structure, in theory, the cost of the battery pack can be greatly reduced and the life of the battery pack can be effectively extended under the conditions of meeting the power demand and driving range. However, actual statistics show that the overall battery pack The actual service life of the loaded car is significantly lower than the bench test life of the battery cell. The possible main reason is that the matching of the working state of the battery pack is unreasonable in the car loading environment.

The structure of hybrid energy storage has been done in a variety of structural schemes, including lithium battery + super capacitor, lead-acid battery + super capacitor, lithium battery + lead-acid battery, but basically the two energy storage devices are directly connected in parallel. It is difficult to achieve the desired effect. This is because the voltage platforms of the two are always consistent in direct parallel connection, and the decoupling of the working states of the two cannot be fundamentally realized, and the simultaneous optimization of the two working conditions cannot be fully realized.

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