Battery Cell Pressure Relief Score With Isolation Groove
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Solution Overview
Problem
The formation process of pressure relief scores on battery cells causes material extrusion that accumulates on the housing surface, leading to defects and affecting its flatness.
Innovation Solution
Integrally forming an isolation groove between the pressure relief score and a perpendicular wall to accommodate extruded material, preventing it from flowing to the housing surface during subsequent processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If pressure relief score is formed on the first wall through stamping, then pressure relief function is achieved, but extruded material accumulates on the second wall causing surface defects and affecting housing flatness
Solution Approach 1:
An isolation groove is introduced as an intermediary structure between the pressure relief score and the second wall. This groove acts as a mediator that captures and contains the extruded material during stamping, preventing it from accumulating on the second wall surface. The isolation groove thus resolves the conflict between achieving pressure relief function and maintaining housing surface flatness.
Solution Approach 2:
The harmful extruded material is extracted from the problematic location (second wall surface) by redirecting it into the isolation groove. This separation removes the source of surface defects from the housing surface, allowing the pressure relief score to function while preserving the aesthetic and structural quality of the second wall.
2Manufacturing precision
If isolation groove is provided between pressure relief score and second wall, then material overflow is blocked and housing flatness is maintained, but device structure becomes more complex
Solution Approach 1:
The isolation groove is merged with the first wall structure, forming an integrated component rather than a separate附加 part. This combining approach maintains housing surface flatness while minimizing the increase in device complexity, as the isolation groove becomes part of the existing wall geometry.
Solution Approach 2:
The isolation groove utilizes the thickness dimension of the first wall to create a three-dimensional containment space for extruded material. By employing the Z-axis (thickness direction) to solve a surface-level problem, the solution adds minimal structural complexity while effectively preventing material overflow onto the second wall.
3Manufacturing precision
If distance between pressure relief score and second wall is increased, then material accumulation on second wall is reduced, but battery cell volume increases
Solution Approach 1:
Instead of increasing the planar distance between the pressure relief score and second wall, the solution utilizes the thickness dimension of the first wall by creating an isolation groove. This dimensional shift allows material containment without expanding the battery cell's external dimensions, thereby maintaining housing surface flatness while avoiding volume increase.
Solution Approach 2:
The isolation groove is nested within the thickness of the first wall, creating a contained space for extruded material without adding external volume. This nested structure prevents material accumulation on the second wall while keeping the battery cell compact and maintaining its original dimensional footprint.
Data Source
AI summary
A battery cell, a battery, and an electric apparatus are provided, capable of reducing the impact of the formation process of a pressure relief score on a surface of a housing of the battery cell. The battery cell includes a first wall and a second wall perpendicular to the first wall, where a pressure relief score is integrally formed on the first wall, an isolation groove is provided in a region on the first wall between the pressure relief score and the second wall, the pressure relief score includes a main body portion, and the main body portion is opposite to the isolation groove in a direction perpendicular to the second wall. In the direction perpendicular to the second wall, a ratio of a distance between the main body portion and the second wall to a dimension of the main body portion is greater than or equal to 10.