Method and system for supplying power by composite power supply

Abstract

The invention discloses a method and system for supplying power by a composite power supply. In the process of supplying power to a load by a storage battery, a circuit processor monitors the output current of the storage battery; when the output current of the storage battery is detected to increase to a first current threshold, the circuit processor feeds back a trigger signal to a control unit,the trigger signal is used to instruct to start a supercapacitor to supply power to the load; the control unit activates the supercapacitor to supply power to the load in response to the trigger signal, to adjust the output current of the storage battery to decrease to a second current threshold. In this way, when the electric vehicle is in a high current operation state such as repeated start and frequent acceleration, the combination of energy storage devices including the storage battery and the supercapacitor can be realized, the energy storage devices are ensured to run under better working conditions, and the problem of serious battery life decay caused by the change of working environment, and the endurance mileage of the vehicle is affected is effectively alleviated.

Description

technical field [0001] The invention relates to the technical field of battery power supply, in particular to a composite power supply method and system. Background technique [0002] With the improvement of user requirements for the cruising range of electric vehicles, the performance requirements of electric vehicles for batteries continue to increase. Lithium-ion batteries in the related art have been widely used in electric vehicles due to their advantages such as high energy density. Lithium-ion batteries are mainly composed of positive electrode materials, negative electrode materials, and electrolytes. Their performance is directly related to whether electric vehicles can meet user needs. [0003] In practical applications, when electric vehicles are often in high-current working conditions such as repeated starts and frequent accelerations, lithium-ion battery materials are bound to withstand rapid changes in current, which will directly lead to capacity attenuation...

AI Technical Summary

Problems solved by technology

[0003] In practical applications, when electric vehicles are often in high-current working states such as repeated starts and frequent accelerations, lithium-ion battery materials are bound to withstand rapid changes in current, which will directly lead to capacity attenuation, resulting in shortened battery life, which in turn will affect the mileage of the car.

At the same time, the performance of lithium-ion batteries will also decline significantly when the operating temperature is high.

In addition, lithium-ion batteries do not have complete charging facilities to ensure repeated operation of the battery

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