E-Cigarette Charging Pack Protection Circuits for Battery Fire Risk
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Solution Overview
Problem
Existing e-cigarette charging systems lack comprehensive safety features to prevent overheating, overcharging, and electrical hazards, particularly with lithium ion batteries which can catch fire due to defects.
Innovation Solution
The proposed solution involves a rechargeable e-cigarette pack with a re-chargeable pack battery, dual protection circuit modules for preventing excessive current and voltage during charging, a charge controller, temperature sensor, and timer to ensure safe charging and operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If lithium ion batteries are used in e-cigarettes and packs to provide high energy density, then the battery capacity and operating time are improved, but the risk of battery fires and safety hazards increases
Solution Approach 1:
A protection circuit module is introduced as an intermediary between the lithium ion battery and the charging/e-cigarette systems. This protection circuit monitors and controls current and voltage levels, preventing excessive charging currents and voltages that could cause battery overheating and fire, while still allowing the high energy density battery to provide extended operating time
Solution Approach 2:
The protection circuit module implements feedback control by continuously monitoring battery parameters (current, voltage, temperature) and automatically adjusting or interrupting charging processes when unsafe conditions are detected. This feedback mechanism prevents battery fires while maintaining the benefits of high-capacity lithium ion batteries
2Reliability
If protection circuit modules with current and voltage threshold monitoring are implemented, then battery safety is improved, but device complexity increases
Solution Approach 1:
The protection circuit module combines multiple safety functions (current monitoring, voltage monitoring, temperature sensing, and automatic disconnection) into a single integrated circuit component. This merging approach provides comprehensive battery protection while minimizing the increase in device complexity, as the single module performs what would otherwise require multiple separate components
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution enhances the safety and reliability of e-cigarette charging by preventing overheating, overcharging, and electrical hazards, thereby reducing the risk of battery fires and ensuring prolonged device functionality.
Implementation Method 1
a temperature sensor, and a timer. The charge controller is configured to prevent electrical power flow from the external battery pack to the battery when the temperature of the battery is determined to lie outside a range defined between a lower temperature threshold and an upper temperature threshold
Implementation Method 2
The first recharging mechanism comprises a first protection circuit module for preventing electrical power flow from the external power source to the pack battery when the current supplied to the pack battery exceeds a first predetermined current threshold or the voltage supplied to the pack battery exceeds a first predetermined voltage threshold
Data Source
AI summary
A pack for containing and recharging an e-cigarette includes: a re-chargeable pack battery; a first connector which is electrically connectable to an external power source; a first recharging mechanism for re-charging the pack battery using the external power source when the first connector is electrically connected to the external power source; a second connector which is electrically connectable to an e-cigarette contained within the pack; and a second recharging mechanism for re-charging the e-cigarette when the e-cigarette is electrically connected to the second connector. The first recharging mechanism includes a first protection circuit module and the second re-charging mechanism includes a second protection circuit module, wherein the protection modules protect the pack and e-cigarette against excessive voltage or current during re-charging.