Battery Cell Pressure Relief Groove for Housing Deformation
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Solution Overview
Problem
The deformation of the housing in battery cells leads to damage of the pressure relief part due to tensile forces, affecting its normal operation.
Innovation Solution
A battery cell design with a pressure relief part featuring a score groove having a first weak segment and a second weak segment with different thicknesses, where the second weak segment is thinner, enhancing structural strength and reducing deformation impact on the pressure relief part.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the housing is designed with a pressure relief part, then the battery cell can release internal pressure, but the housing deformation subjects the pressure relief part to tensile force causing damage
Solution Approach 1:
The pressure relief part is designed with non-uniform thickness distribution, featuring a first weak segment with smaller thickness and a second weak segment with larger thickness. This local quality variation allows the thinner first weak segment to initiate cracking for pressure relief while the thicker second weak segment provides structural support to resist tensile forces from housing deformation, thus resolving the contradiction between pressure relief functionality and tensile force resistance.
2Reliability
If the score groove is made thinner to facilitate cracking, then pressure relief can occur, but the deformation resistance of the score groove is reduced
Solution Approach 1:
The score groove incorporates segments with different thicknesses: a first weak segment with smaller thickness that facilitates easy cracking for pressure relief, and a second weak segment with larger thickness that enhances deformation resistance. This local differentiation allows the score groove to both initiate cracking when needed and maintain structural integrity against deformation.
Solution Approach 2:
The score groove is divided into multiple segments with different thickness characteristics. The first weak segment is designed to crack preferentially for pressure relief, while the second weak segment provides structural reinforcement. This segmentation allows different parts of the same component to serve different functions, resolving the contradiction between crack initiation and deformation resistance.
Data Source
AI summary
A battery cell, a battery, and an electrical apparatus. The battery cell comprises an electrode assembly, a housing, and a pressure relief part. The electrode assembly comprises a positive pole piece and a negative pole piece. The positive pole piece and the negative pole piece are stacked to form a straight flat region. The housing is used for accommodating the electrode assembly, wherein the housing comprises a first wall part and two second wall parts. The two second wall parts are respectively located on two sides of the straight flat region. The pressure relief part is arranged on the first wall part, and the pressure relief part is formed with a score groove. First weak sections and second weak sections are formed at the bottom of the score groove, and the thickness of the second weak sections is less than the thickness of the first weak sections.