Power Storage SOC Range Rotation to Slow Battery Deterioration
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In power storage systems where batteries are charged and discharged in narrow SOC ranges, the progression of battery deterioration is accelerated, particularly when using lithium iron phosphate batteries.
Innovation Solution
The method involves grouping power storage facilities into multiple groups and setting multiple SOC ranges that are shifted from each other as operational options. Each group is then operated within a selected SOC range, and the SOC range is sequentially switched among the available options to prevent continuous operation within a single narrow range.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If power storage facilities are operated in a narrow SOC range to meet usage requirements, then operational efficiency is improved, but battery deterioration accelerates
Solution Approach 1:
The power storage facilities are divided into multiple groups, and multiple SOC ranges are segmented and set as operational options. Each group operates within a selected SOC range, and the ranges are sequentially switched. This segmentation allows the system to maintain narrow SOC operation for efficiency while rotating through different segments to prevent deterioration in any single range.
2Reliability
If multiple SOC ranges are set and sequentially switched to reduce deterioration, then battery durability is improved, but system complexity increases
Solution Approach 1:
The SOC range selection is made dynamic through sequential switching between multiple predefined ranges. Instead of fixing facilities in static SOC ranges, the system dynamically rotates through different ranges in sequence. This dynamic approach distributes wear across all ranges while maintaining simple control logic for switching.
Data Source
AI summary
In an embodiment, in an operation method of a power storage system, a plurality of SOC ranges shifted from each other are set, and one of the SOC ranges to be an option is selected as an operation SOC range for each of a plurality of groups so as to be in a state where the SOC ranges selected are different between the groups. In the operation method, a power storage facility belonging to each of the groups is operated in the SOC range selected as the operation SOC range, and the SOC range to be selected as the operation SOC range is sequentially switched between the plurality of SOC ranges for each of the groups so as to be in a state in where the SOC ranges selected are different between the groups.