Secondary cell system having plurality of cells, and method for distributing charge/discharge electric power

Abstract

Provided is a secondary cell system having a plurality of cells, capable of contributing to increased service life of cells and enhanced (energy) efficiency of charging / discharging of the system as a whole. A secondary cell system (10) is provided with a plurality of cells (3-1 to 3-30) individual capable of charging / discharging control, a plurality of PCS (2-1 to 2-30) corresponding to and connected to each cell, respectively, for charging / discharging the corresponding cell, and a cell controller (1) for distributing a charging / discharging electric power value for the system as a whole to each of the PCS (2-1 to 2-30) at a periodic or arbitrary timing. The cell controller (1) has a priority order calculation unit for assigning a priority order to the plurality of cells (3-1 to 3-30) at each time on the basis of a degradation characteristic relating to the SOC of each cell (3-1 to 3-30), and a distribution ratio determination unit for distributing a charging / discharging electric power value to the PCS (2-1 to 2-30) in accordance with the priority order.

Description

Technical field [0001] Embodiments of the present invention relate to a secondary battery system having a plurality of batteries that can be individually controlled for charge and discharge, and a method for distributing charge and discharge power or current (hereinafter referred to as charge and discharge power, etc.) using the secondary battery system . Background technique [0002] For applications such as suppression of fluctuations in power generation using natural energy sources such as sunlight and wind, suppression of fluctuations in power demand, or peak shift (Peak Shift), the application of large-scale power storage systems based on secondary batteries is expected. In order to construct such a large-scale power storage system, a number of batteries (sub-battery systems: hereinafter referred to as "batteries") capable of individually controlling charge and discharge power, etc., are combined and applied. In such a system composed of a plurality of batteries, there is a...

AI Technical Summary

Problems solved by technology

In such a system composed of a plurality of batteries, there is a problem of how to allocate command values ​​such as charge and discharge power for the entire power storage system to individual batteries as constituent elements.

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