Battery End Cap Venting With Polymer Rupture Membrane
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current batteries face safety concerns due to poor pressure relief mechanisms, which can lead to deformation, cracking, and non-smooth pressure release, resulting in unstable safety and risk of short circuits.
Innovation Solution
An end cap assembly with a pressure relief mechanism made of polymer material, featuring a weakened portion with an indented groove that cracks to facilitate smooth gas passage, while blocking external moisture, thereby enhancing safety and preventing short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a pressure relief mechanism is provided in the end cap, then pressure relief function is achieved, but the mechanism is prone to deformation, cracking and local opening leading to non-smooth pressure relief
Solution Approach 1:
The patent pre-forms weakened portions (indented grooves) in the pressure relief mechanism before use. These grooves concentrate stress at specific locations, ensuring that when pressure builds up, the mechanism will crack along the predetermined groove path rather than deforming or cracking unpredictably. This preliminary structuring guarantees smooth and reliable pressure relief.
Solution Approach 2:
The patent changes the material parameters and structural parameters of the pressure relief mechanism by incorporating indented grooves with specific depth, width, and positioning. These parameter modifications create controlled weak points that facilitate predictable cracking behavior, transforming the mechanism from one prone to random deformation to one that reliably opens along predetermined paths.
2Reliability
If the pressure relief mechanism is made of polymer material, then gas discharge is steady and waterproof, but moisture blocking capability must be maintained
Solution Approach 1:
The patent uses a polymer material to create the pressure relief mechanism, which acts as a flexible membrane capable of both steady gas discharge and moisture blocking. The polymer film maintains its integrity under normal conditions to block moisture while allowing controlled cracking for gas release when pressure builds up, thus resolving the contradiction between gas discharge stability and moisture protection.
3Ease of manufacture
If an indented groove is provided on the pressure relief mechanism, then machining is easy and production cost is low, but the groove structure must effectively guide cracking
Solution Approach 1:
The patent segments the pressure relief mechanism by introducing indented grooves that divide the structure into distinct regions. This segmentation simplifies manufacturing by providing clear machining guides while ensuring that cracks propagate along the grooved paths. The grooves act as predetermined failure lines that are easy to machine but precisely control the cracking behavior.
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 ensures steady gas discharge and prevents moisture ingress, reducing the risk of short circuits and improving battery safety by providing a reliable and efficient pressure relief mechanism.
Implementation Method 1
the polymer material has breathable and waterproof properties and the pressure relief mechanism is made of a polymer material, not only can gas be steadily discharged from the battery cell when pressure is relieved from the battery cell, but external moisture can also be blocked from penetrating into the battery cell
Implementation Method 2
the pressure relief mechanism is provided with a weakened portion configured to crack when pressure is relieved from the battery cell
Data Source
AI summary
The present application provides an end cap assembly, a battery cell, a battery and a power consuming device, and relates to the field of batteries. The end cap assembly comprises an end cap and a pressure relief mechanism. The end cap is provided with a pressure relief hole, and the pressure relief mechanism covers the pressure relief hole. The pressure relief mechanism is made of a polymer material. The pressure relief mechanism is provided with a weakened portion configured to crack when pressure is relieved from the battery cell. Due to the pressure relief mechanism made of a polymer material, not only can gas be steadily discharged from the battery cell when pressure is relieved from the battery cell, but external moisture can also be blocked from penetrating into the battery cell when the battery cell is in normal use, reducing the risk of short circuit of the battery cell.