Battery Pressure Relief Part With Multi-Stage Score Grooves
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Solution Overview
Problem
Existing pressure relief apparatuses in batteries fail prematurely due to cracks formed during the formation of deep score grooves, leading to unreliable pressure relief even when internal pressures are within normal ranges.
Innovation Solution
A pressure relief apparatus with multi-stage score grooves arranged sequentially from a first surface to a second surface, where each stage's forming depth is reduced, minimizing forming forces and crack risks, and featuring intersecting groove segments for rapid and stable pressure relief.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If deep score grooves are formed in the pressure relief part to enable pressure relief, then pressure relief function is improved, but cracks are generated on the pressure relief part during groove formation, leading to premature failure
Solution Approach 1:
The score grooves are divided into multiple stages (first-stage, second-stage, third-stage grooves) arranged sequentially from the first surface toward the second surface. This segmentation allows the grooves to be formed in steps, reducing the forming depth of each individual groove and minimizing the risk of cracks during formation, while still achieving the required pressure relief function when all stages combine.
2Strength
If multi-stage score grooves are arranged sequentially from first surface to second surface with each stage on bottom surface of previous stage, then forming depth of each groove is reduced, but device complexity increases
Solution Approach 1:
The multi-stage score grooves are arranged in a nested configuration where the second-stage grooves are positioned on the bottom surface of the first-stage grooves, and third-stage grooves are positioned on the bottom surface of the second-stage grooves. This nested arrangement allows the grooves to be stacked vertically within the thickness of the pressure relief part, reducing the lateral footprint and simplifying the overall structure while maintaining the multi-stage benefit of reduced forming depth.
Data Source
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AI summary
The embodiments of the present application provide a pressure relief apparatus, a battery cell, a battery, and an electrical device, which belong to the technical field of batteries. The pressure relief apparatus comprises a pressure relief part and multi-stage score grooves, wherein the pressure relief part has a first surface and a second surface in a thickness direction thereof that are opposite to each other; and the multi-stage score grooves are sequentially arranged on the pressure relief part in a direction from the first surface to the second surface, wherein among two adjacent stages of score grooves in the thickness direction, the stage of score groove far from the first surface is arranged on the bottom surface of the stage of score groove near the first surface. The pressure relief apparatus of this structure adopts the structure of multi-stage score grooves, which can reduce the forming depth of each stage of score groove, thereby reducing the forming force applied to the pressure relief part when each stage of score groove is formed, and reducing the risk of cracks generated on the pressure relief part, so that the pressure relief apparatus is not easy to fail due to cracks generated on the pressure relief part at the position where the score grooves are arranged, thus improving the long-term reliability of the pressure relief apparatus.