Battery Cell Terminal Sealing Structure for Corner Crack Resistance
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Solution Overview
Problem
The reliability of battery cells is compromised due to cracking at stress-concentrated corners where the terminal extrudes the insulating and sealing structure during assembly, leading to compromised insulation and sealing performance.
Innovation Solution
The insulating and sealing structure is designed with softer and harder parts strategically positioned to absorb stress and maintain sealing integrity, featuring softer first parts closer to stress-concentrated corners and harder parts for support, along with gaskets to reduce stress transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the terminal extrudes the insulating and sealing structure during assembly, then the terminal achieves secure installation, but stress concentration at corners causes cracking
Solution Approach 1:
The insulating and sealing structure employs different material hardness values at different locations: softer material at corners prone to stress concentration and harder material at other areas. This local differentiation allows the softer corners to absorb assembly stress through deformation, preventing cracking while maintaining overall structural integrity and sealing effectiveness
Solution Approach 2:
The patent changes the material parameter (hardness) of the insulating and sealing structure from uniform to non-uniform distribution. By adjusting the hardness parameter locally at corner regions, the structure achieves optimal balance between stress absorption during assembly and maintaining mechanical strength for reliable installation
2Ease of manufacture
If the insulating and sealing structure uses uniform material hardness, then manufacturing is simplified, but stress distribution becomes uneven causing cracks at corners
Solution Approach 1:
The insulating and sealing structure employs different material hardness values at different locations: softer material at corners prone to stress concentration and harder material at other areas. This local differentiation allows the softer corners to absorb assembly stress through deformation, preventing cracking while maintaining overall structural integrity and sealing effectiveness
Solution Approach 2:
The patent applies composite material principles by combining materials with different hardness properties within a single insulating and sealing structure. This composite approach enables different regions to perform specialized functions: softer regions for stress absorption and harder regions for structural support, achieving both reliability and manufacturing feasibility
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
This design mitigates cracking risks, enhances insulation and sealing reliability, and improves the overall performance and safety of battery cells.
Implementation Method 1
the first part is easier to deform to absorb the acting force through being stressed and compressed than the second part
Implementation Method 2
an insulating and sealing structure fitted between the first shell wall and the terminal
Implementation Method 3
an insulating and sealing structure fitted between the first shell wall and the terminal
Data Source
AI summary
Battery cell, a battery, and an electric device are disclosed. The battery cell includes a first shell wall, a terminal, and an insulating and sealing structure. The terminal includes a passing portion and a first extending portion that extends to either the outside of the outer surface or the inside of the inner surface of the first shell wall. A first corner is formed at the junction of the first extending portion and the passing portion, facing the first shell wall. The first shell wall includes a second corner corresponding to the first corner. The insulating and sealing structure is positioned between the terminal and the first shell wall and includes a first part and a second part. The first part has a lower material hardness than the second part and is positioned closer to at least one of the first corner or second corner than the second part.