Battery Cell Casing Buffer Groove for Score Groove Rupture
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Solution Overview
Problem
Battery cells experience rupture at the score groove due to expansion and deformation of the electrode assembly, leading to reduced reliability and potential liquid leakage.
Innovation Solution
Incorporating a buffer groove on the outer side of the score groove to allow the housing to deform and release expansion forces, reducing the tensile deformation at the score groove and enhancing the structural integrity of the battery cell.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a pressure relief part with a score groove is disposed on the battery cell to ensure safety, then the battery cell can release pressure when subjected to predetermined conditions, but the electrode assembly expansion during charging and discharging causes rupture at the score groove, reducing reliability
Solution Approach 1:
A buffer groove is introduced as an intermediary structure between the score groove and the housing wall. This buffer groove absorbs and distributes the expansion forces from the electrode assembly, preventing direct transmission of tensile stress to the score groove. The buffer groove acts as a stress-dissipating intermediary that protects the critical pressure relief function while accommodating electrode expansion.
Solution Approach 2:
The buffer groove is designed in advance to cushion and absorb expansion forces before they can cause rupture at the score groove. By providing this protective structure beforehand, the patent prevents the harmful effect of tension-induced rupture while maintaining the pressure relief capability of the score groove.
2Strength
If the housing is made rigid to maintain structural integrity, then the housing can accommodate the electrode assembly, but the expansion force from electrode assembly deformation causes rupture at the pressure relief part
Solution Approach 1:
The housing wall at the pressure relief part is segmented into multiple regions: a first wall part containing the score groove, a second wall part containing the buffer groove, and a third wall part. This segmentation allows different regions to serve different functions - the buffer groove region accommodates expansion through controlled deformation while other regions maintain structural integrity.
Solution Approach 2:
The housing is designed with local quality variations - the buffer groove region has reduced thickness and increased flexibility to accommodate expansion, while other regions maintain sufficient thickness and rigidity for structural support. This localized differentiation allows the housing to simultaneously maintain overall integrity and locally accommodate electrode assembly expansion.
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 buffer groove effectively reduces the probability of tension-induced rupture and liquid leakage, thereby prolonging the service life and improving the reliability of the battery cell.
Implementation Method 1
the housing can be deformed at the buffer groove to some extent when the electrode assembly expands, such that the expansion force of the electrode assembly can be released at the buffer groove
Data Source
AI summary
A battery cell, a battery, and an electrical apparatus. The battery cell comprises: an electrode assembly; and a casing, the casing being used for accommodating the electrode assembly. The casing is provided with a scoring groove and a buffer groove, the scoring groove defining a predetermined pressure relief area which is opened when the battery cell is subjected to pressure relief, and the buffer groove being located on the side of the scoring groove away from the geometric center of the predetermined pressure relief area.