Battery Bypass Control for Capacity Balancing During Charge Reversal
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Solution Overview
Problem
Existing power storage systems with storage batteries connected in series face inefficiencies when frequently switched between charge and discharge, leading to incomplete utilization of remaining capacities due to insufficient time for capacity uniformity during transitions.
Innovation Solution
A storage battery control device that executes a first process to decrease capacity differences between batteries by switching them between connection and bypass states, followed by a second process maintaining all batteries in a connected state, with a bypass prevention period during state transitions from charge to discharge or discharge to charge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the bypass circuit switches storage batteries between connection state and bypass state to equalize remaining capacities, then capacity uniformity is improved, but switching time increases and usable capacity decreases
Solution Approach 1:
The control device executes a first charge control or discharge control to equalize remaining capacities before the second charge control or discharge control. This preliminary equalization ensures that when frequent switching occurs, the storage batteries are already in a balanced state, preventing capacity loss and maximizing usable capacity while maintaining uniformity.
2Stability of the object's composition
If the first charge control or discharge control is executed to equalize remaining capacities, then capacity uniformity is improved, but the time required for complete charge/discharge cycles increases
Solution Approach 1:
The system performs capacity equalization as a preliminary step before entering the second charge control or discharge control phase. By completing equalization beforehand, the system ensures that subsequent frequent switching operations can proceed efficiently without additional time penalties, as the batteries are already balanced.
Solution Approach 2:
The control device periodically monitors remaining capacities and executes equalization controls at appropriate intervals. This periodic approach maintains capacity uniformity without continuously switching, thereby minimizing time loss while ensuring batteries remain balanced during frequent charge/discharge operations.
3Speed
If frequent switching between charge and discharge occurs, then system responsiveness is improved, but remaining capacities cannot be fully utilized due to insufficient equalization time
Solution Approach 1:
The control device executes equalization control (first charge control or discharge control) before entering the second charge control or discharge control phase. This preliminary equalization ensures that when frequent switching occurs for rapid response, the storage batteries are already in a balanced state, allowing full utilization of remaining capacities without sacrificing responsiveness.
Data Source
AI summary
A storage battery control device controls a storage battery string including storage batteries connected in series and a bypass circuit configured to switch the storage batteries between a bypass state and a connection state. While causing the bypass circuit to switch the storage batteries between the bypass state and the connection state, a process of charging or discharging the storage batteries is executed to decrease a difference between remaining capacities of the storage batteries until completion of the process. And then, the process is executed while causing the bypass circuit to maintain the storage batteries in the connection state, and when the process is switched from charge to discharge or from discharge to charge, a period where a bypass prevention process of preventing the bypass circuit from switching the storage batteries from the connection state to the bypass state is executed is provided.