Contact Lens Battery Management via Cell Isolation
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Solution Overview
Problem
Existing battery management systems for electronic contact lenses are inadequate in monitoring and managing battery health, particularly in preventing excessive heat generation due to internal short circuits, which is exacerbated by low internal resistance and lacks effective methods to mitigate component or battery faults.
Innovation Solution
A battery management system (BMS) with a power management integrated circuit (PMIC) that monitors and controls individual battery cells, detects faults, and isolates faulty cells to limit power dissipation, using switches to decouple affected components and manage power efficiently, thereby reducing heat generation and enhancing battery performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional battery management systems are used in electronic contact lenses, then the system structure is simple, but the system cannot effectively monitor and manage individual battery cells, leading to excessive heat generation and system failures
Solution Approach 1:
The patent divides the battery into individual cells and implements separate monitoring and management for each cell through the PMIC. Each cell can be independently monitored for voltage, temperature, and charge state, and faulty cells can be isolated without affecting other cells. This segmentation enables effective battery health monitoring while managing the complexity through modular cell-level control.
2Power
If battery internal resistance is reduced to improve power delivery, then power delivery capability increases, but heat generation due to internal short circuits is exacerbated
Solution Approach 1:
By segmenting the battery into multiple cells with individual monitoring, the system can detect abnormal current draw or short circuits in individual cells. When a short circuit is detected, the PMIC can isolate the faulty cell, preventing excessive heat generation while maintaining power delivery from healthy cells.
Solution Approach 2:
The PMIC continuously monitors voltage, current, and temperature across all battery cells and provides real-time feedback. When abnormal conditions indicating potential excessive heat generation are detected, the system responds by adjusting charge/discharge currents or isolating faulty cells, thereby preventing harmful heat buildup while maintaining optimal power delivery.
3Reliability
If individual battery cells are monitored and controlled separately, then battery health management and fault isolation improve, but device complexity increases
Solution Approach 1:
The patent combines multiple monitoring functions (voltage measurement, current measurement, temperature sensing, charge control, discharge control) into a single integrated PMIC. This merging of functions into one chip reduces the overall device complexity compared to using separate discrete components for each function, while still enabling individual cell monitoring and fault isolation.
Data Source
AI summary
A contact lens battery management system (BMS) monitors battery health in an electronic contact lens. A battery made with high-internal-resistance cells is coupled on a cell-by-cell basis to input switches of a power management integrated circuit (PMIC) that monitors, detects, and isolates faulty circuit components.