Battery End Cap Vent Groove Structure Against Premature Opening

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Solution Overview

Problem

The pressure relief structure in battery end caps often opens prematurely when the core is inverted, leading to inadequate pressure relief and increased susceptibility to external impacts, resulting in failure to achieve normal pressure relief function.

Innovation Solution

The end cap design incorporates a pressure relief groove with a long groove section and a short groove section in different orientations, where the long groove section has a thickening zone, enhancing its strength and impact resistance, and is strategically arranged to prevent premature opening until internal pressure reaches detonation levels.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the pressure relief groove is made thin to facilitate pressure relief, then the pressure relief function is improved, but the impact resistance deteriorates

Engineering Contradiction:

Improvepressure relief functionVSAvoidimpact resistance

Core Design Contradiction:

ReliabilityVSStrength

Solution Approach 1:

The end cap employs different thicknesses in different regions: the first groove section maintains a smaller thickness to facilitate pressure relief, while the second groove section has a larger thickness to resist external impacts. This local differentiation allows each region to optimize its properties for its specific function.

Inventive Principle:

Principle #3Local quality

Solution Approach 2:

The pressure relief groove is divided into two distinct groove sections with different thickness characteristics. The first groove section is designed for pressure relief functionality, while the second groove section is designed for impact resistance, creating segmented functional zones within the single groove structure.

Inventive Principle:

Principle #1Segmentation

2Speed

If the groove section is made thin to enable easy opening, then the pressure relief speed is improved, but the susceptibility to external impact increases

Engineering Contradiction:

Improvepressure relief speedVSAvoidsusceptibility to external impact

Core Design Contradiction:

SpeedVSObject-affected harmful factors

Solution Approach 1:

Different groove sections have different thicknesses tailored to their specific functions: the first groove section has smaller thickness for fast opening and pressure relief, while the second groove section has larger thickness to resist external impacts and prevent premature opening.

Inventive Principle:

Principle #3Local quality

3Strength

If the end cap thickness is increased to improve impact resistance, then the strength is improved, but the pressure relief function deteriorates

Engineering Contradiction:

Improveimpact resistanceVSAvoidpressure relief function

Core Design Contradiction:

StrengthVSReliability

Solution Approach 1:

The end cap uses variable thickness design where the first groove section has smaller thickness to maintain pressure relief functionality, while the second groove section has larger thickness to provide impact resistance. This localized thickness differentiation resolves the contradiction between overall strength and pressure relief function.

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS20250007079A1End cap, battery cell, battery, and electrical device

Publication Date: 2025.01.02 CONTEMPORARY AMPEREX TECHNOLOGY (HONG KONG) LIMITED

AI summary

An end cap includes a cap body and a pressure relief groove and the pressure relief groove is provided in the cap body. The pressure relief groove includes a long groove section and a short groove section located in different orientations, wherein the long groove section is connected to the short groove section. The long groove section is provided with a thickening zone, and a thickness of the cap body in the thickening zone is greater than a thickness of the cap body in the short groove section.