Charging station energy storage cabinet and energy storage system

Abstract

The invention provides a charging station energy storage cabinet and an energy storage system. The charging station energy storage cabinet comprises a cabinet body, a power distribution cabin and a plurality of battery cabins, wherein the power distribution cabin and the battery cabins are arranged in the cabinet body; each battery cabin comprises a battery pack; the output end of the battery packin one energy storage branch is connected with a high-voltage box in the energy storage branch; a high-voltage box in each energy storage branch is connected with the direct-current side of an energystorage converter in the energy storage branch; and the alternating-current sides of the energy storage converters of the branches are connected to an alternating-current confluence terminal in parallel. The plurality of energy storage converters are adopted; each battery pack is connected to the alternating current confluence terminal through the independent energy storage converter; and therefore, the problem that current impact is generated due to the fact that the multiple battery packs are connected in parallel is avoided. The charging station energy storage system is topologically splitinto multiple branch distributed energy storage systems, and therefore, the problems of centralized multi-battery-pack parallel impact, inter-pack imbalance and the like are avoided. Economic lossescaused by the fact that multiple groups of centralized batteries are excessively centralized and some batteries are on fire to influence other batteries are avoided.

Description

technical field [0001] The present disclosure relates to the technical field of electric vehicle charging and energy storage technologies, and in particular, to an energy storage cabinet and an energy storage system of a charging station. Background technique [0002] The statements in this section merely provide background information related to the present disclosure and do not necessarily constitute prior art. [0003] At present, with the increasing number of electric vehicles, the charging station will have a large charging peak load, resulting in an increasingly tight distribution network capacity. With the application and development of energy storage technology, energy storage technology plays an increasingly important role in the fields of new energy power generation and power grid operation. The combination of energy storage and electric vehicle charging can delay the upgrading and transformation of distribution network capacity by eliminating peaks and filling va...

AI Technical Summary

Problems solved by technology

[0005] Container-type energy storage uses multiple sets of batteries connected in parallel to the DC side of the energy storage converter. The instantaneous impact current of different battery sets in parallel is large, and it is easy to burn the circuit. The short-circuit effect of the battery will cause the imbalance between the battery sets to be enlarged and the battery cycle will be reduced. life, increasing the difficulty of battery management

Multiple sets of batteries are placed in parallel in one battery compartment, which has a high energy density. Once a local battery catches fire, even if the fire is extinguished in time, it will often affect other batteries and cause great economic losses.

[0006] At present, most of the charging stations are distributed. The total power of the charging station is small, and the corresponding supporting energy storage capacity demand is small (within 500kwh), and the land for charging stations is tight and the land cost is high.

For the small-capacity energy storage of the charging station, container-type energy storage is adopted. The cost of the container cabinet and the energy management system is high, and the container occupies a large area, which leads to high energy storage costs and increases the land area and cost of the charging station.

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