E-Cigarette Charging Pack Circuits for Overcurrent and Heat Protection
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Solution Overview
Problem
E-cigarettes and their charging packs face safety and reliability concerns due to the risk of lithium ion battery defects, such as overheating or overcharging, which can lead to fires, and existing solutions lack systematic protection mechanisms.
Innovation Solution
A rechargeable e-cigarette pack with built-in protection circuit modules that regulate electrical power flow to prevent overcurrent, overvoltage, and temperature-related issues during charging, featuring a charge controller, temperature sensor, and timer to ensure safe and reliable operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Duration of action of moving object
If lithium ion batteries are used in e-cigarettes and charging packs to provide high energy density, then the battery capacity and operating duration are improved, but the risk of battery defects such as overheating or overcharging increases, which can lead to fires
Solution Approach 1:
The protection circuit modules perform preliminary actions by continuously monitoring battery parameters (voltage, current, temperature) before hazardous conditions develop. The system proactively prevents overcharging, overcurrent, and overheating by detecting abnormal trends early and taking corrective action, rather than waiting for actual thermal runaway or fire conditions to occur.
Solution Approach 2:
The protection circuit modules act as intermediary safety devices between the lithium ion batteries and the rest of the system. These circuits mediate the electrical power flow, inserting protective functionality into the power path to prevent direct harmful interactions between the high-energy-density batteries and potential failure modes.
2Reliability
If protection circuit modules are added to regulate electrical power flow and prevent overcurrent and overvoltage, then battery safety is improved, but device complexity increases
Solution Approach 1:
Multiple protection functions (overcurrent protection, overvoltage protection, temperature monitoring) are merged into integrated protection circuit modules. Rather than implementing separate discrete circuits for each safety function, the design combines these protective capabilities into unified modules that work together, reducing overall circuit complexity while maintaining comprehensive safety coverage.
3Productivity
If the pack is made larger to accommodate a larger battery with higher charge capacity, then the recharging frequency is reduced, but the portability and ease of operation deteriorate
Solution Approach 1:
The pack battery is designed with excessive action by providing significantly more charge capacity than the minimum required to recharge the e-cigarette battery once. This over-provisioning of battery capacity (800 mAh versus 60 mAh for the e-cigarette) ensures that the pack can recharge the e-cigarette multiple times without needing to be recharged itself, effectively eliminating recharging frequency as a constraint while keeping the pack portable enough for practical use.
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
The solution provides enhanced safety and reliability by preventing electrical hazards during charging, reducing the risk of battery defects and ensuring safe operation of e-cigarettes and their packs.
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
Implementation Method 3
A pack is provided for containing and recharging an e-cigarette. The pack comprises: a re-chargeable pack battery
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.