Deep Discharge Detection for Lithium-Ion Batteries
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Solution Overview
Problem
Lithium-ion batteries in portable electronic devices can suffer from deep discharge, leading to permanent damage, unsafe conditions, and potential hazards due to parasitic resistances and internal operations, as they continue to discharge beyond the cutoff voltage, causing bulging, excessive heating, or explosions.
Innovation Solution
A system and method that includes a processor-operated detection of battery voltage, charging the battery for a short duration, rebooting the device, and providing user prompts via LEDs or audible alerts when the voltage falls below the cutoff, ultimately shutting down the device to prevent further damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If the battery operates without deep discharge detection, then the device can continue operating longer, but the battery may be deeply discharged causing permanent damage and unsafe conditions
Solution Approach 1:
The system performs preliminary detection of deep discharge conditions before they cause permanent battery damage. By monitoring voltage during startup and after charging intervals, the system identifies deeply discharged batteries early and prevents further operation that would cause permanent harm, thus protecting battery reliability while allowing normal operation duration.
2Reliability
If the system continuously monitors battery voltage to detect deep discharge, then battery safety is improved, but device complexity increases
Solution Approach 1:
Instead of continuous monitoring, the system performs periodic voltage checks at specific intervals: during startup initialization and after charging for predetermined time periods. This periodic detection approach maintains battery safety monitoring capability while significantly reducing system complexity compared to continuous real-time monitoring.
3Reliability
If the system charges the battery for extended periods to recover from deep discharge, then battery usability is improved, but the risk of overheating and damage increases
Solution Approach 1:
The system applies partial charging action by charging the battery for predetermined, limited time periods rather than attempting full recovery. This partial charging approach provides enough charge to restore basic usability and enable safe operation without subjecting the deeply discharged battery to prolonged charging that could cause overheating or chemical instability.
Data Source
AI summary
Systems and processes are provided to detect a deeply discharged rechargeable battery. A process includes initiating a processor operative to perform a function within a battery-operated device, determining a first output voltage of a battery, charging the battery with a battery charger for a duration of time between three and seven seconds in response to the first output voltage being less than a cutoff voltage, rebooting the battery-operated device, determining a second output voltage of the battery, providing a user prompt indicative of battery fault in response to the second output voltage being less than the cutoff voltage, and shutting down the battery-operated device.