Battery Voltage Balance Control for Hot-Plug Replacement
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Solution Overview
Problem
Existing battery replacement methods in power supply systems require shutting down the power supply, leading to safety and stability issues due to voltage imbalances caused by voltage drops between replaced and existing battery units.
Innovation Solution
Implementing a method and device with charge and discharge switches to control the charging or discharging of each battery unit based on its operating state, ensuring voltage balance by generating and transmitting control signals to manage the switches, thereby allowing for hot-plugging and maintaining system stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If battery units are replaced by shutting down the power supply system, then replacement safety is improved, but system availability and continuous operation are deteriorated
Solution Approach 1:
The patent applies preliminary action by pre-charging the replaced battery unit before disconnecting it from the power supply system. This ensures that the battery unit is fully charged and ready for replacement without causing voltage imbalances or requiring system shutdown, thus maintaining both safety and continuous operation.
Solution Approach 2:
The patent segments the battery replacement process into independent steps: identifying the battery unit to be replaced, pre-charging it independently, disconnecting it while maintaining system operation, and connecting the replaced unit. This segmentation allows replacement operations to proceed without shutting down the entire power supply system.
2Ease of operation
If battery units are replaced without voltage balance control, then replacement operation is simplified, but voltage imbalance and system failure risk are increased
Solution Approach 1:
The patent implements feedback control by continuously monitoring the voltage of each battery unit during the replacement process. The control unit adjusts the charging current based on real-time voltage measurements, ensuring that voltage balance is maintained throughout the replacement operation. This automated feedback mechanism simplifies the operation while guaranteeing voltage balance.
Solution Approach 2:
The patent changes the charging parameters dynamically during the replacement process. By adjusting charging current and voltage thresholds based on the specific state of each battery unit, the system maintains voltage balance without requiring complex manual intervention, thus improving both ease of operation and reliability.
3Reliability
If charge and discharge control switches are added to each battery unit branch, then voltage balance control is improved, but device complexity is increased
Solution Approach 1:
The patent makes the control unit universal by designing it to manage multiple functions: identifying battery units, controlling charge/discharge switches, monitoring voltage, and adjusting charging parameters. This single multi-functional control unit replaces what would otherwise require multiple separate control systems, thus improving voltage balance control while minimizing the increase in device complexity.
Data Source
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AI summary
The embodiments of the present invention provide a method for hot-plugging, a control device for hot-plugging, and a method and device for voltage balance. In one aspect, in an embodiment of the present invention, when there is a battery unit to be replaced in a plurality of parallel battery units, a branch in which the battery unit to be replaced locates may be cut off. Therefore, the technical solution provided by the embodiments of the present invention may solve a contradictory problem between the replacement of the battery unit and the normal operation of the power supply system in the related art and a problem caused thereby that the safety and stability of the power supply system are low.