Intelligent charging pile system based on battery echelon utilization and charging method

Abstract

The invention relates to technical application of echelon utilization of a fuel cell and a lithium battery in a charging pile, in particular to an intelligent charging pile system based on battery echelon utilization and a charging method. The intelligent charging pile system comprises a power generation subsystem, an energy storage subsystem, a charging subsystem and a control subsystem. The power generation subsystem comprises an air supply module, a fuel supply module, an SOFC module and a starting module, the air supply module and the fuel supply module are both connected with the SOFC module, and the starting module is also connected with the air supply module, the fuel supply module and the SOFC module; the energy storage subsystem comprises a DC / DC input module, an energy storage module and a DC / DC output module, the SOFC module is connected with the DC / DC input module, and the DC / DC input module, the energy storage module and the DC / DC output module are connected in sequence.

Description

technical field [0001] The invention relates to a technical application of cascade utilization of fuel cells and lithium batteries in charging piles, in particular to an intelligent charging pile system and charging method based on cascade utilization of batteries. Background technique [0002] China has become the world's largest producer and seller of new energy vehicles. In 2018, the sales volume of new energy vehicles in my country reached 1.01 million, a year-on-year increase of 83%. New energy vehicles include fuel cell vehicles, pure electric vehicles, and plug-in hybrid vehicles; among them, the sales volume of pure electric vehicles is 769,000 units, which is the most important type of new energy vehicles. Pure electric vehicles use power lithium-ion batteries as energy storage devices, and a passenger car is usually equipped with a battery of 40-70kWh. During driving, the electric energy stored in the lithium battery is exhausted and must be connected to a chargi...

AI Technical Summary

Problems solved by technology

There are the following problems: (1) Households usually need 5-10kW of electricity, which does not match the tens of kilowatts required by fast charging. If lithium batteries are used as energy storage, the cost is high and users cannot afford it; (2) The electricity generated by the fuel cell is DC, and the output of the charging pile is DC. In order to meet the needs of the home grid, the invention must convert DC to AC, and then convert it back to DC when it is input to the charging pile. The equipment is complex and expensive, and the conversion energy is seriously wasted.

However, issues such as dismantling, sorting, and re-capacity of decommissioned batteries have deeply troubled the development of the cascade utilization industry.

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