Controllable Switching Elements for Battery Protection
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Solution Overview
Problem
Rechargeable batteries face safety and performance issues due to unmonitored charging constraints, such as maximum permissible charging voltage, current, and temperature, which can lead to damage or injury if not adhered to during charging.
Innovation Solution
A battery protection device with a charging line and sense line, both equipped with switching elements, is used to monitor and control charging parameters, disconnecting the battery from charging or sensing circuits when unsafe conditions are detected, ensuring safe and optimal charging.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If switching elements are added to charging and sense lines for battery protection, then battery safety and protection capability are improved, but device complexity increases
Solution Approach 1:
The protection circuit is segmented into independent controllable switching elements (FETs Q1-Q4) placed on both charging lines and sense lines. Each switching element can be independently controlled to open or close specific circuit paths, allowing granular protection control. This segmentation enables the system to address battery safety through multiple discrete protection points while maintaining manageable circuit complexity through modular design.
2Measurement precision
If sense lines are used to monitor battery voltage accurately, then measurement precision is improved, but current leakage and safety risks increase
Solution Approach 1:
The sense lines are equipped with controllable switching elements (FETs Q3 and Q4) that dynamically open or close based on battery condition. When overcharging, over-discharging, or fault conditions are detected, these switches open the sense lines to prevent current leakage and protect the battery. This dynamic control allows the system to maintain accurate voltage monitoring during normal operation while automatically isolating the sense lines when harmful current leakage is detected.
Data Source
AI summary
A device includes a rechargeable battery and a charging line, connected to a terminal of the rechargeable battery, charging the rechargeable battery. The charging line includes two switching elements electrically opening or closing the charging line, and a sense line, connected to a terminal of the rechargeable battery, sensing a battery voltage. The sense line includes two switching elements electrically opening or closing the sense line.