Battery Pack Valve Structure for Pressure and Gas Velocity Control
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Solution Overview
Problem
Conventional battery pack safety valves fail to adequately adjust internal pressure and gas ejection velocity when internal pressure increases, leading to potential breakdown or inadequate gas discharge.
Innovation Solution
A battery pack design featuring a valve structure with a valve member and biasing member, where the biasing member adjusts the valve's opening to control gas flow velocity by compressing between an adjustment screw and stopper, allowing precise pressure and velocity adjustments through screw adjustment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional safety valve structure is used, then the valve can open to release pressure, but the internal pressure cannot be precisely controlled and gas ejection velocity cannot be appropriately adjusted
Solution Approach 1:
The patent applies parameter changes by introducing an adjustment screw that modifies the pre-load force on the biasing member (spring). By changing the compression amount of the spring through screw adjustment, the opening pressure and gas ejection velocity parameters are precisely controlled. This allows the safety valve to open at specific pressure thresholds and maintain appropriate ejection velocities, resolving the contradiction between reliable pressure release and precise pressure control.
2Reliability
If the safety valve opens to release pressure, then internal pressure is reduced, but gas ejection velocity may be excessive or insufficient
Solution Approach 1:
The biasing member's pre-load force is adjusted through the adjustment screw, which directly influences the gas ejection velocity parameter. By modifying the spring compression amount, the system controls the force with which the valve opens and the velocity at which gas is ejected. This ensures gas is discharged at appropriate velocities that are neither too fast (causing ignition risks) nor too slow (failing to relieve pressure effectively).
Solution Approach 2:
The adjustment screw mechanism provides a form of manual feedback control, allowing the user to set the desired pressure and velocity parameters before operation. The system responds to internal pressure buildup by opening the valve at the predetermined threshold, creating a feedback loop that maintains safe operating conditions while controlling ejection velocity.
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
Enables reliable pressure adjustment and ejection velocity control, preventing excessive pressure buildup and ensuring efficient gas discharge, thus protecting the battery pack from damage and preventing ignition during gas discharge.
Implementation Method 1
a biasing member provided inside the pack case... and the biasing member biases the valve member toward an inner side of the pack case
Data Source
AI summary
A battery pack includes: a battery cell; a pack case that accommodates the battery cell and that is provided with an opening; and a valve structure provided to open and close the opening. The valve structure includes a valve member having a valve body portion fitted to an inner peripheral surface of the opening, and a biasing member provided inside the pack case. When an internal pressure of the pack case is increased, the valve member is moved to an outer side of the pack case so as to form a clearance between an outer peripheral surface of the valve body portion and the inner peripheral surface of the opening, and the biasing member biases the valve member toward an inner side of the pack case.