Battery Pack Venting With Pressure-Responsive Magnetic Closure
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Solution Overview
Problem
Existing battery packs lack an efficient mechanism to safely vent gases generated during pressure changes, potentially leading to safety hazards and performance issues.
Innovation Solution
A battery pack design incorporating a vent hole with an opening/closing member that utilizes elastic members and magnetic members to automatically open and close in response to internal pressure changes, ensuring safe gas discharge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If a vent hole is provided in the pack case to discharge gas, then gas discharge capability is improved, but reliability deteriorates due to risk of unauthorized opening or failure to close properly
Solution Approach 1:
The elastic member automatically opens the vent hole when internal pressure increases and closes it when pressure decreases, without requiring external control mechanisms. The system serves itself by using the pressure differential to drive the opening/closing action, ensuring reliable operation based on actual pressure conditions.
Solution Approach 2:
The patent replaces complex mechanical control systems with a simple elastic member that responds directly to pressure changes. This mechanical substitution eliminates the need for motors, sensors, or control circuits, improving reliability while maintaining gas discharge capability.
2Device complexity
If a simple vent hole is used without opening/closing mechanism, then device complexity is reduced, but harmful factors increase due to inability to control gas discharge
Solution Approach 1:
The elastic member with magnetic member creates a self-regulating system that opens only when needed (high pressure) and closes automatically when pressure normalizes. This self-service mechanism prevents uncontrolled gas discharge while maintaining structural simplicity.
Solution Approach 2:
The system changes its state based on pressure parameters - closed at normal pressure and open at high pressure. This parameter-driven operation ensures gas discharge is controlled by actual pressure conditions rather than being permanently open or closed.
3Reliability
If elastic members are used to open/close vent hole in response to pressure changes, then reliability is improved, but manufacturing precision requirements increase
Solution Approach 1:
The magnetic member acts as an intermediary that provides a strong closing force to ensure the elastic member returns to its closed position reliably. This magnetic assistance compensates for variations in elastic member manufacturing, ensuring consistent operation without requiring extremely tight tolerances.
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 a reliable and repeatable mechanism for venting gases, enhancing safety and maintaining pack integrity by using elastic and magnetic components that respond to pressure variations.
Implementation Method 1
at least one elastic member, for example on the pack case, the at least one elastic member being deformable by the change in the internal pressure of the pack case to open and close the vent hole
Implementation Method 2
a magnetic member on the at least one elastic member, the magnetic member being configured to generate a magnetic force
Data Source
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AI summary
A battery pack includes a pack case with a battery module, a vent hole in the pack case, the vent hoe being configured to discharge to the outside gas generated inside the pack case, and an opening/closing member in the vent hole, the opening/closing member being configured to open and close the vent hole in conjunction with a change in an internal pressure of the pack case.