Battery Terminal Seal Compression for Heat-Stable Leakage Prevention
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Cylindrical batteries experience reduced sealing performance and potential leakage due to thermal shrinkage of insulating members and rebounding sealing rings when temperature rises, compromising insulation and sealing integrity.
Innovation Solution
A secondary battery design with a compression ratio of the sealing member between 20% and 50% for the sealing member, along with specific configurations of the electrode terminal and insulators, including inner and outer flanges, insulators, and accommodating grooves, to maintain sealing performance under temperature variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the compression ratio of the sealing member is increased to improve sealing, then sealing effectiveness is improved, but the risk of damage to the electrode terminal or housing increases
Solution Approach 1:
The patent optimizes the compression ratio parameter to a specific range (10-30%), avoiding both insufficient compression (which would cause leakage) and excessive compression (which would damage components). This parameter optimization balances sealing effectiveness with structural integrity, ensuring reliable sealing without compromising the electrode terminal or housing.
Solution Approach 2:
By applying a controlled pre-compression within the 10-30% range, the sealing member is prepared in advance to provide adequate sealing force without exceeding the structural limits of adjacent components. This preliminary action prevents both leakage and damage simultaneously.
2Reliability
If a sealing member is added to improve sealing, then leakage prevention is improved, but the device complexity increases
Solution Approach 1:
The patent merges the sealing function into the existing battery structure by positioning the sealing member at the interface between the electrode terminal and housing, where it simultaneously provides sealing and structural support. This integration approach adds minimal complexity while achieving reliable leakage prevention.
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 design enhances sealing effectiveness by providing stable insulation and reduced leakage risk even at elevated temperatures, ensuring reliable operation of the battery.
Implementation Method 1
A compression ratio w of the sealing member is in a range of: 20%≤w≤50%
Data Source
AI summary
A secondary battery includes a housing, an electrode assembly, an electrode terminal, and a sealing member. The housing includes an end wall and a side wall surrounding the end wall, and the end wall is provided with an electrode terminal hole. The electrode assembly is arranged in the housing. The electrode terminal passes through the end wall and is electrically connected to the electrode assembly. The sealing member is located between the electrode terminal and the end wall. A compression ratio w of the sealing member is in a range of: 20%≤w≤50%. The technical problem of lowered sealing performance of the sealing member between the electrode terminal and the housing under the influence of temperature rise is improved.