Battery Cell Pressure Relief Structure for Impact Buffering

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Solution Overview

Problem

Existing pressure relief components in battery cells experience premature actuation and deformation due to internal and external impact forces, leading to poor operational stability and reduced service life.

Innovation Solution

A pressure relief component with a pressure relief portion, reinforcing portion, and a first weakened portion, where the stiffness of the first weakened portion is less than that of the reinforcing portion, allowing it to deform more easily and absorb impact forces, thereby protecting the pressure relief portion.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the pressure relief component is made with uniform structure, then the manufacturing is simple, but the pressure relief portion is prone to deformation and premature actuation under impact forces

Engineering Contradiction:

Improveoperational stability of pressure relief componentVSAvoidstructural complexity of pressure relief component

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The pressure relief component employs local quality by creating a first weakened portion with different structural characteristics (reduced thickness) compared to the reinforcing portion. This localized structural variation allows the first weakened portion to absorb impact forces through deformation, protecting the pressure relief portion while maintaining overall structural integrity. The component transitions from uniform structure to non-uniform structure with specific local modifications.

Inventive Principle:

Principle #3Local quality

2Strength

If the pressure relief portion is made more robust, then it resists deformation better, but it becomes more prone to premature actuation under impact forces

Engineering Contradiction:

Improvedeformation resistance of pressure relief portionVSAvoidpremature actuation resistance

Core Design Contradiction:

StrengthVSReliability

Solution Approach 1:

The first weakened portion acts as a beforehand cushioning mechanism. By designing this portion with reduced thickness and lower deformation resistance, the structure anticipates impact forces and provides a sacrificial element that deforms first, absorbing energy before it reaches the pressure relief portion. This preliminary cushioning prevents the robust pressure relief portion from experiencing direct impact that would cause premature actuation.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

Solution Approach 2:

The first weakened portion serves as an intermediary between the external impact forces and the pressure relief portion. This intermediate structure absorbs and dissipates impact energy through controlled deformation, mediating the force transmission to the pressure relief portion and preventing direct coupling that would lead to premature actuation.

Inventive Principle:

Principle #24Intermediary (Mediator)

3Strength

If the thickness of the pressure relief component is increased, then the overall strength is improved, but the impact force absorption capability is reduced

Engineering Contradiction:

Improveoverall strength of pressure relief componentVSAvoidimpact force sensitivity

Core Design Contradiction:

StrengthVSObject-affected harmful factors

Solution Approach 1:

The component uses local quality by varying thickness across different portions. The first weakened portion has reduced thickness to provide impact absorption, while the reinforcing portion maintains greater thickness for overall structural strength. This localized thickness variation resolves the contradiction between overall strength and impact force absorption capability.

Inventive Principle:

Principle #3Local quality

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

This design mitigates premature actuation and enhances the operational stability and service life of the battery cell by providing a buffering effect against impact forces.

Implementation Method 1

the first weakened portion is made more prone to deformation. This allows the first weakened portion to effectively absorb the deformation energy of the battery cell when the battery cell is subjected to internal and external impact forces and deforms

Methodology Applied

Scientific EffectDeformation: Deformation

Data Source

PatentUS20250343319A1Pressure relief component, battery cell, battery, and electrical apparatus

Publication Date: 2025.11.06 CONTEMPORARY AMPEREX TECHNOLOGY CO LTD

AI summary

The pressure relief component includes a pressure relief portion, a reinforcing portion, and a first weakened portion. The pressure relief portion is configured to rupture when the battery cell relieves pressure, so as to release the internal pressure of the battery cell. The reinforcing portion is connected to the pressure relief portion, and the reinforcing portion is arranged around the pressure relief portion. The first weakened portion is connected to the pressure relief portion via the reinforcing portion, stiffness of the first weakened portion being less than stiffness of the reinforcing portion. This structure of the pressure relief component makes the first weakened portion more prone to deformation, allowing the first weakened portion to absorb the deformation energy of the battery cell when the battery cell is subjected to internal and external impacts and deforms, enabling the first weakened portion to provide a certain buffering effect.