Battery Cell Pressure Relief Groove Structure to Prevent Premature Cracking
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Solution Overview
Problem
Existing pressure relief apparatuses in battery cells fail prematurely due to cracking when internal pressure is within normal ranges, leading to poor long-term reliability.
Innovation Solution
A pressure relief apparatus with staged depressed and indented grooves, where grooves are formed sequentially, reducing forming force and cracking risk, and designed to open at specific boundaries for efficient pressure relief.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a pressure relief apparatus with indented groove is provided in the battery cell, then the pressure relief function is achieved when internal pressure reaches threshold, but the apparatus may crack and fail when pressure is within normal range, resulting in poor long-term reliability
Solution Approach 1:
The pressure relief apparatus is divided into multiple stages with different groove types (depressed grooves and indented grooves) arranged in sequence. The depressed grooves are formed first to create initial stress relief zones, followed by indented grooves that define the final pressure relief boundary. This segmentation allows the structure to progressively manage stress without premature cracking.
Solution Approach 2:
The depressed grooves are formed in advance before the indented grooves during the manufacturing process. This preliminary action creates pre-stress relief zones that prepare the pressure relief portion to handle future pressure increases without sudden failure, thereby improving long-term reliability.
2Strength
If multiple stages of depressed and indented grooves are formed in sequence, then the forming force is reduced and cracking risk is minimized, but the manufacturing process becomes more complex
Solution Approach 1:
The groove formation process is segmented into multiple stages with different groove types (depressed grooves first, then indented grooves). This segmentation allows each stage to be optimized independently, reducing the forming force required at each step while maintaining overall structural integrity.
Solution Approach 2:
The depressed grooves are formed in advance before the indented grooves during the manufacturing process. This preliminary action creates pre-stress relief zones that prepare the pressure relief portion to handle future pressure increases without sudden failure, thereby improving long-term reliability.
Data Source
AI summary
A pressure relief apparatus includes a pressure relief portion provided with a first surface and a second surface arranged opposite to each other in a thickness direction of the pressure relief portion, and at least one stage of depressed groove and an indented groove. The at least one stage of depressed groove and the indented groove are formed in the pressure relief portion in sequence in a direction from the first surface to the second surface. A groove bottom wall of the stage of depressed groove farthest away from the first surface among the at least one stage of depressed groove is provided with an opening area. The indented groove is formed along an edge of the opening area. The opening area is configured to be openable with the stage of indented groove farthest away from the first surface as a boundary.