Battery Module Isolation for State-of-Charge Balance
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Solution Overview
Problem
Power supply devices with series-connected battery modules face issues where modules with smaller capacities experience faster state-of-charge depletion, leading to potential device shutdown when their state-of-charge reaches a lower limit, causing inefficiencies and system instability.
Innovation Solution
Incorporating a disconnecting mechanism that allows for forced isolation of battery modules regardless of the gate driving signal, enabling control of the number of modules isolated to maintain balanced state-of-charge levels and ensure a target output voltage, thereby preventing device shutdown.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If battery modules are connected in series with equal current flow, then the power supply device can maintain simple circuit operation, but battery modules with smaller capacity experience faster state-of-charge depletion leading to device shutdown
Solution Approach 1:
The battery system is segmented into multiple independently controllable battery modules, each equipped with its own switching circuit. This allows individual modules to be managed separately, enabling the controller to adjust current flow to each module based on its specific state-of-charge, thereby preventing premature shutdown while maintaining operational simplicity through modular architecture.
Solution Approach 2:
The system transitions from static equal current distribution to dynamic current management. The controller dynamically adjusts the current flowing through each battery module based on real-time state-of-charge monitoring, allowing modules with smaller capacity to receive reduced current when needed, thus preventing device shutdown while maintaining overall system stability.
2Power
If the number of battery modules is increased to maintain output voltage, then the power supply capacity is improved, but the number of modules that become unusable increases leading to device shutdown
Solution Approach 1:
The system changes the current parameter dynamically for each battery module based on its capacity and state-of-charge. By monitoring individual module parameters and adjusting current distribution accordingly, the system can utilize a higher number of battery modules to maintain output voltage without proportionally increasing the number of modules that become unusable, thus preventing device shutdown.
3Stability of the object's composition
If forced isolation of battery modules is implemented, then the state-of-charge balance is improved, but the control complexity increases
Solution Approach 1:
The system performs preliminary monitoring of state-of-charge in each battery module and proactively adjusts current distribution before significant imbalances occur. By detecting early signs of state-of-charge divergence and preemptively isolating or adjusting individual modules, the system maintains balance without requiring complex real-time control mechanisms.
Solution Approach 2:
The controller implements feedback control by continuously monitoring the state-of-charge of each battery module and adjusting the current distribution accordingly. When a module's state-of-charge approaches problematic levels, the controller provides feedback to the switching circuits to isolate or reduce current to that module, maintaining overall balance through simple feedback-based adjustments rather than complex control algorithms.
Data Source
AI summary
Provided is a power supply device which includes a plurality of battery modules and in which the battery modules are connected in series with one another in accordance with a gate driving signal from a controller. The power supply device includes a disconnecting part configured to forcibly isolate the battery module from a series connection regardless of the gate driving signal, and limits, in accordance with a target output voltage value, a number of the battery modules to be forcibly isolated by the disconnecting part.