Battery Bypass Control for Balanced Discharge and Output Power
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Solution Overview
Problem
Existing power storage systems with multiple batteries connected in series face challenges in continuously supplying power as a power source, as they require measures to equalize discharge capacities and maintain output power, especially when batteries reach a discharge end state.
Innovation Solution
A storage battery control device and method that includes a bypass circuit to manage the discharge of batteries by equalizing remaining discharge amounts and maintaining output power by switching batteries in and out of bypass mode, ensuring continuous power supply by adjusting open circuit voltage and state of charge thresholds.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If storage batteries are switched to bypass state in order from a storage battery whose dischargeable capacity has reached a predetermined value, then the dischargeable capacities of all storage batteries can be equalized, but the available output power may fall below the minimum necessary power of the power supply destination
Solution Approach 1:
The patent dynamically adjusts the bypass switching order based on real-time parameters including dischargeable capacity, available output power, and minimum necessary power requirements. Instead of fixed sequential bypass switching, the system calculates optimal switching sequences that maintain output power above threshold levels while still equalizing discharge capacities across all storage batteries.
Solution Approach 2:
The system implements dynamic bypass control where the bypass switching sequence is not predetermined but adaptively determined based on current system state. The control device continuously monitors dischargeable capacities and available output power, and adjusts the bypass switching order in real-time to balance equalization precision with power output requirements.
2Stability of the object's composition
If storage batteries are switched to bypass state to equalize dischargeable capacities, then capacity uniformity is improved, but continuous power supply capability deteriorates
Solution Approach 1:
The control device implements feedback control by continuously monitoring both dischargeable capacity differences and available output power levels. The bypass switching decisions are made based on feedback from these measurements, ensuring that equalization actions do not compromise continuous power supply capability. The system adjusts bypass sequences in response to real-time system state feedback.
Solution Approach 2:
The system changes operational parameters dynamically by adjusting which storage batteries are bypassed and when, based on real-time measurements of dischargeable capacity and power output. This parameter-based control allows the system to maintain both capacity uniformity and continuous power supply by adapting bypass sequences to current system conditions.
3Power
If all storage batteries are switched to discharge state after equalization, then maximum power output is achieved, but the difference in remaining discharge amounts increases
Solution Approach 1:
The system employs periodic alternating between bypass mode and discharge mode. Storage batteries are periodically switched between bypass state (for equalization) and discharge state (for power output). This periodic action allows the system to achieve maximum power output during discharge phases while maintaining relatively small differences in remaining discharge amounts through prior equalization phases.
Data Source
AI summary
A storage battery control device for controlling a power storage system including storage battery modules and a bypass circuit executes a first process of causing the storage battery modules to discharge while switching the storage battery modules caused to be bypassed by the bypass circuit so as to reduce a difference between remaining discharge amounts until discharge completion of the storage battery modules; and a second process of completing the discharge of the storage battery modules after the first process. The first process is executed until an OCV or an SOC of the storage battery modules decreases to be equal to or smaller than a threshold value of the OCV or the SOC set for the storage battery modules. The first process is executed so that available output power of the storage battery module caused to discharge does not fall below minimum necessary power of a power supply destination.