Battery Pack Self-Discharge Control for High-Temperature Swelling Prevention
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Solution Overview
Problem
Battery cells in battery packs are prone to high-temperature swelling and liquid leakage due to excessive gas generation, which degrades their stability and reliability, especially in electronic devices exposed to high temperatures like navigation devices in vehicles.
Innovation Solution
A battery pack with a temperature sensor and a self-discharge unit that senses temperature and voltage, enabling self-discharge when conditions exceed reference thresholds, thereby reducing the battery cell's capacity and voltage to prevent swelling and leakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the battery cell is kept charged to maintain capacity, then the energy availability is improved, but the battery cell is prone to high-temperature swelling and liquid leakage
Solution Approach 1:
The control unit continuously monitors temperature and voltage of the battery cell, and automatically activates the self-discharge unit when threshold values are exceeded, creating a closed-loop feedback system that prevents swelling while managing energy availability
Solution Approach 2:
The self-discharge unit performs preliminary discharge action before severe swelling occurs by detecting early temperature and voltage exceedances, preventing the harmful effects of gas accumulation while maintaining reasonable energy availability
2Reliability
If the battery cell voltage and capacity are reduced to prevent swelling, then the reliability is improved, but the energy availability decreases
Solution Approach 1:
The self-discharge unit applies partial discharge action only when necessary (when temperature or voltage exceeds thresholds), rather than continuous discharge, thereby maintaining reliability while minimizing the impact on energy availability during normal operation
Data Source
AI summary
A method for protecting a battery cell from high-temperature swelling, the method includes: sensing a temperature and a voltage of the battery cell; determining whether the sensed temperature of the battery cell exceeds a reference temperature; determining whether the sensed voltage of the battery cell exceeds a reference voltage, when the sensed temperature of the battery cell exceeds the reference temperature; and self-discharging the battery cell in a charge/discharge/standby mode when the sensed voltage of the battery cell exceeds the reference voltage.