Battery Pack Reset Mechanism Preventing Unexpected Startups
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Solution Overview
Problem
Lithium-ion battery packs deteriorate rapidly under adverse conditions such as overcharging, over-discharging, overheating, or over-cooling, and lack effective mechanisms to prevent unexpected device startups after shutdowns.
Innovation Solution
A battery pack with a temperature sensor and control unit that interrupts current flow upon overheating and requires a reset signal to restore it, ensuring safe operation by requiring user interaction and temperature normalization before resuming power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If automatic reset is implemented after shutdown, then device availability is improved, but safety is worsened due to unexpected startups
Solution Approach 1:
The system automatically monitors temperature conditions and self-resets when safe, eliminating the need for manual intervention while maintaining safety through continuous monitoring
Solution Approach 2:
The temperature sensor provides continuous feedback to the control unit, enabling automatic detection of unsafe conditions and triggering appropriate shutdown or reset actions based on real-time temperature data
2Reliability
If manual reset is required, then safety is improved by preventing unexpected startups, but device complexity is worsened
Solution Approach 1:
The control unit acts as an intermediary between the temperature sensor and the discharge switch, processing temperature data and automatically controlling the switch based on predefined thresholds without requiring manual intervention
3Reliability
If continuous monitoring is implemented, then safety is improved, but energy consumption is worsened
Solution Approach 1:
The system performs temperature monitoring and control actions periodically based on temperature thresholds rather than continuously, reducing energy consumption while maintaining safety through interval-based checks
Data Source
AI summary
A battery pack may include a plurality of battery cells; a discharge switch in series with the battery cells, a temperature sensor configured to sense temperature in the battery pack, and a battery control unit adapted to receive a signal indicative of temperature from the temperature sensor and operable to control the switch to interrupt current flow from the battery cells when the temperature exceeds an over-temperature threshold. The battery control unit may be adapted to receive a reset signal and operable to control the switch to restore current flow upon receipt of the reset signal and when the temperature is below an operating temperature threshold.