Electric Storage System Current Breaker State Detection
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Solution Overview
Problem
In electric storage systems with multiple cells connected in parallel, the increased number of operating current breakers leads to a higher current load on non-operating cells, making efficient charge and discharge control challenging without specifying the number of operating breakers.
Innovation Solution
A controller determines the state of each electric storage block by acquiring parameters like internal resistance and full charge capacity, using change rates to specify the number of current breakers in a broken state, allowing for controlled charge and discharge to manage current load.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the number of operating current breakers is increased, then the current protection capability is improved, but the current load on non-operating cells is increased
Solution Approach 1:
The controller acquires parameters (internal resistance, full charge capacity) of each electric storage block and uses change rates between acquired parameters and reference values to detect the number of operating current breakers. This feedback mechanism allows the system to monitor the state of current breakers and adjust control strategies accordingly, preventing excessive current load on non-operating cells while maintaining protection capability.
Solution Approach 2:
The system monitors changes in parameters (internal resistance, full charge capacity) of electric storage blocks to detect the operational state of current breakers. By tracking parameter change rates and comparing them with reference values, the system can identify when current breakers operate and adjust charge/discharge control to manage current distribution among cells.
2Reliability
If the operational state of current breaker is detected, then the safety is improved, but the charge and discharge control efficiency deteriorates due to excessive limitation
Solution Approach 1:
Instead of limiting charge and discharge for all cells when any current breaker operates, the system selectively applies control only to blocks with operated breakers. By acquiring parameters of individual blocks and comparing change rates, the system identifies specific blocks needing protection while allowing other blocks to operate at full capacity, thus maintaining overall productivity while ensuring safety.
3Device complexity
If the number of operating current breakers is not specified, then the system complexity is reduced, but the charge and discharge control precision deteriorates
Solution Approach 1:
The system uses the inherent electrical parameters (internal resistance, full charge capacity) of each electric storage block as self-indicators of their operational state. By monitoring changes in these parameters and comparing them with reference values, the system automatically determines the number of operating current breakers in each block without requiring additional sensors or complex detection mechanisms, achieving precise control while maintaining simplicity.
Data Source
AI summary
An electric storage system includes electric storage blocks and a controller determining the state of each of the electric storage blocks. The plurality of electric storage blocks are connected in series, and each of the electric storage blocks has a plurality of electric storage elements connected in parallel. Each of the electric storage elements has a current breaker breaking a current path within the electric storage element. The controller acquires at least one parameter of an internal resistance and a full charge capacity of each of the electric storage blocks, and uses a change rate between the acquired parameter and a reference value to specify the number of current breakers in a broken state (the number of breaks) in each of the electric storage blocks. The reference value refers to the value of the parameter in the electric storage block not including the current breaker in the broken state.