Battery Cell Swelling Prevention via Voltage Drop Control
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Solution Overview
Problem
Battery swelling phenomena, caused by abnormal electrical-chemical processes, lead to life shortening, capacity reduction, and potential accidents like ignition and explosion, as existing methods struggle to detect and prevent swelling effectively in early stages.
Innovation Solution
A method involving temperature and voltage monitoring of battery cells, where a dropped charging voltage is applied when conditions exceed reference thresholds, and maintained at a minimum voltage to prevent swelling, using a control unit with temperature and voltage sensing units to adjust charging voltage accordingly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If physical volume expansion sensing is used to detect battery swelling, then the battery can be protected from severe swelling, but the swelling phenomenon cannot be detected in early stages
Solution Approach 1:
The patent applies preliminary action by monitoring temperature and voltage parameters before actual swelling occurs. The control unit detects abnormal temperature rise and voltage changes as early indicators of potential swelling, enabling preventive action before physical expansion happens. This shifts detection from late-stage volume measurement to early-stage parameter monitoring.
Solution Approach 2:
The patent implements feedback control by continuously monitoring battery temperature and voltage, comparing them against reference values, and adjusting charging parameters accordingly. When abnormal temperature or voltage is detected, the system provides feedback to reduce charging current or terminate charging, preventing swelling progression.
2Reliability
If charging voltage is reduced to prevent swelling, then battery stability improves, but charging efficiency decreases
Solution Approach 1:
The patent applies dynamics by making charging voltage and current adjustable rather than fixed. The control unit dynamically modifies charging parameters based on real-time temperature and voltage conditions, allowing full charging voltage when safe and reduced voltage when swelling risk is detected. This enables adaptive optimization of both safety and charging efficiency.
Solution Approach 2:
The patent implements parameter changes by modifying charging voltage and current based on detected battery conditions. When temperature or voltage exceeds reference values, the system changes charging parameters to prevent swelling. This allows flexible adjustment between charging speed and safety based on actual battery state.
Data Source
AI summary
A method for preventing swelling of a battery cell in advance by counting a time while a temperature and a cell voltage of the battery cell are maintained equal to or greater than respective reference values, and by dropping a charging voltage to lower the temperature and the cell voltage of the battery cell, when the time is a reference time or longer.