Gradient complementation type electric-thermal balance power storage and charging system and method

Abstract

The invention provides a gradient complementation type electric-thermal balance power storage and charging system and method. The system comprises a renewable energy inlet side, a flow battery stack,a power grid inlet side, a current conversion device, an electric power outlet side, a storage battery stack, a flow battery liquid storage tank, and the like. In a working process, the system performs gradient complementation of electric power to achieve stable and continuous output, and internal and external thermal balance is achieved, thereby being energy-saving and efficient. By means of thecooperative operation of a flow battery and a storage battery, when the storage battery is deactivated, resulting in poor charge state or even halt, the flow battery is used as a controllable supplementary power storage unit to discharge the system to perform the gradient complementation so as to maintain the continuous and stable supply of the electric power of a power supply side. Meanwhile, thesystem uses an electrolyte circulating pipeline of the flow battery as a thermal balance pipeline, the internal thermal balance of the system is achieved by the flow of the electrolyte among the storage battery stack, the current conversion device, the flow battery stack and the liquid storage tank, and the thermal adjustment between the internal temperature difference of the system and the external environment temperature difference is achieved by the deployment of the electrolyte between a heat preservation tank of the liquid storage tank and a cooling tank.

Description

technical field [0001] The invention relates to a charging system and method, in particular to a step-by-step complementary electric-thermal balance storage charging system and method. Background technique [0002] With the continuous development of new energy utilization technology, new energy vehicles have ushered in great development in the world, especially in China. With the dual support of technology and policy, my country's new energy vehicles, especially pure electric vehicles, continue to grow at a rate of nearly 300,000 per year. The emergence of a large number of pure electric vehicles means that my country's demand for charging piles and charging and swapping stations is increasing. At present, the ratio of domestic charging facilities to new energy vehicles is maintained at about 1:4, which is far from the standardized 1:1. Far. [0003] At present, charging and swapping stations on the market mainly use charging piles as the main current conversion device. Its...

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Problems solved by technology

However, the energy efficiency of the flow battery is relatively low during the cycle process, and an appropriate increase in temperature can effectively improve the working efficiency of the battery, and the additional power consumption brought about by the heating process also affects the operating cost of the flow battery.

[0007] Traditional current conversion devices rely on real-time power supply from the grid and the waste heat generated seriously affects their work efficiency. Traditional battery energy storage technology and waste storage batteries are inconvenient and flexible to supplement electric energy during operation, and their lifespan is low. Waste heat also affects work efficiency. Flow batteries The low energy density of the electrolyte is not suitable for small-scale energy storage, and the work efficiency is low. It needs to be properly heated to improve the efficiency. The change of the external environment temperature during the start-up or operation of the charge-discharge system brings great challenges to the safe start-up and stable operation of the system. , these four types of problems have always affected the further development and application of its technology

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