Sealed Secondary Cell Container Rupture Guidance
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Solution Overview
Problem
Existing sealed secondary cell containers are vulnerable to jolting and impact, leading to premature disconnection of the closure member portion due to the weight of the electrode plate group, which can result in unintended opening at lower internal pressures than intended, potentially causing safety hazards.
Innovation Solution
A container design featuring a flexible electrically conducting connection part with a spiraling thin strip configuration that guides the closure member portion to a parallel position after rupture, ensuring electrical disconnection under excess pressure while withstanding impacts and jolts, using a thinner portion of reduced strength to manage pressure and prevent premature rupture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the electrode plate group is placed directly on the releasable closure member portion, then the safety device can be actuated by excess pressure, but the weight of the electrode plate group causes premature tearing of the thinned portion during jolts or impact
Solution Approach 1:
An electrically insulating ring member is introduced as an intermediary between the electrode plate group and the base. This ring member supports the electrode plate group and distributes its weight, preventing direct transmission of impact forces to the thinned portion while maintaining electrical insulation to prevent short circuits.
Solution Approach 2:
The electrically insulating ring member serves as a protective cushion that absorbs and distributes the mechanical stress from jolts and impact before it reaches the thinned portion, thereby preventing premature failure of the safety mechanism.
2Adaptability or versatility
If the thinned portion is made thinner to facilitate easier rupture under excess pressure, then the safety device activates at lower pressure, but it becomes vulnerable to tearing during normal operation
Solution Approach 1:
The base is designed with non-uniform thickness: the thinned portion has reduced thickness to enable pressure-activated rupture, while other portions maintain sufficient thickness for structural strength. The electrically insulating ring member further reinforces specific areas to prevent premature failure during impact.
3Object-generated harmful factors
If the closure member portion is designed to disconnect under excess pressure, then gas can be exhausted, but electrical continuity may be maintained causing short circuit
Solution Approach 1:
The electrically insulating ring member acts as an intermediary that prevents electrical contact between the electrode plate group and the base wall. This ensures that when the closure member portion disconnects under excess pressure, electrical continuity is automatically broken, preventing short circuits while allowing gas exhaustion.
Solution Approach 2:
The base is designed with differentiated functional zones: the thinned portion for pressure-activated rupture to enable gas release, and electrically insulating regions to ensure electrical disconnection occurs simultaneously, addressing both safety requirements locally.
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 container effectively maintains electrical disconnection under excess pressure while providing enhanced resistance to jolting and impact, ensuring safe operation by ensuring the closure member portion disconnects only at intended high pressures, preventing accidental chemical release.
Implementation Method 1
a weakened portion delimiting the closure member portion, joining the peripheral portion to the closure member portion, and adapted to rupture in the presence of an excess pressure inside the container
Implementation Method 2
an electrically conducting flexible connection part, electrically connected to the closure member portion and adapted to be electrically connected to the electrode plate group, in which, in the presence of an excess pressure leading to rupturing of said weakened portion, the connection part guides the closure member portion to a position after rupture which is substantially parallel to the position thereof prior to rupture
Data Source
AI summary
A container for a sealed secondary cell containing an electrode plate group is provided comprising a wall forming a base (2) in electrically conducting material, the base comprising a peripheral portion (2a), a closure member portion (2b) and a weakened portion (2c) joining the peripheral portion (2a) to the closure member portion and designed to rupture in the presence of an excess pressure inside the container. An electrically insulating ring member (4) is mounted on the peripheral portion to support the electrode plate group, and the container includes an electrically conducting flexible connection part (3), electrically connected to the closure member portion (2b) and to the electrode plate group, in which, in the presence of an excess pressure leading to rupturing of the weakened portion, the connection part guides the closure member portion to a position after rupture which is substantially parallel to its position prior to rupture.