Battery Module Power Transfer Control for SOC and Voltage Balance
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Solution Overview
Problem
In power storage systems, abnormalities in the function or operation of power transmission buses can lead to increased variations in voltage or state of charge (SOC) between battery modules, potentially causing damage or deterioration due to overcharge or overdischarge, which existing protection circuits may fail to adequately address.
Innovation Solution
The system includes a control unit that detects abnormalities in power transmission, limits power transfer, and employs a balance correction unit and protection circuits to equalize voltages and prevent overcharge/overdischarge, ensuring safe operation by managing power flow and balancing SOC across connected battery modules.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If power transmission buses are used to connect battery modules, then power transmission efficiency is improved, but voltage variations between modules increase due to abnormalities
Solution Approach 1:
The control unit continuously monitors voltage levels and power transmission status across all battery modules, and dynamically adjusts power transmission control based on detected abnormalities to maintain voltage stability while preserving transmission efficiency during normal operation
Solution Approach 2:
The system transitions from static power transmission control to dynamic control that adapts to changing conditions, adjusting power flow in real-time based on detected abnormalities to prevent voltage variations while maintaining efficient transmission under normal conditions
2Reliability
If existing protection circuits are used, then basic protection is provided, but they fail to adequately address overcharge/overdischarge caused by power transmission abnormalities
Solution Approach 1:
The control unit detects abnormalities in power transmission before they cause overcharge or overdischarge conditions, and preemptively adjusts or stops power transmission to prevent harmful effects, rather than merely reacting after damage occurs
Solution Approach 2:
The control unit acts as an intermediary between the power transmission buses and battery modules, monitoring transmission status and inserting control actions to prevent harmful voltage variations that existing protection circuits cannot address
3Reliability
If balance correction units are added to equalize voltages, then voltage variations are reduced, but device complexity increases
Solution Approach 1:
The control unit performs multiple functions including abnormality detection, power transmission control, and balance correction operations, eliminating the need for separate dedicated balance correction hardware while achieving voltage equalization through software/control logic
Data Source
AI summary
Electric equipment includes: a power transmission/reception unit which transmits/receives electric power between a first assembled battery and a second assembled battery; a first power line which is connected to a positive electrode terminal of the first assembled battery and connected to a positive electrode terminal of the second assembled battery via the power transmission/reception unit; a second power line which is connected to a negative electrode terminal of the first assembled battery and connected to a negative electrode terminal of the second assembled battery via the power transmission/reception unit; and a limitation unit which is arranged between the positive electrode terminal of the first assembled battery and the first power line or between the negative electrode terminal of the first assembled battery and the second power line, and limits transmission/reception of electric power via the power transmission/reception unit between the first assembled battery and the second assembled battery.