Battery Cell Pressure Relief Structure for Controlled Vent Flipping
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Solution Overview
Problem
Current batteries suffer from poor reliability, particularly in terms of pressure relief mechanisms, leading to potential premature cracking and reduced performance during thermal runaway events.
Innovation Solution
A battery cell design incorporating a pressure relief component with defined weak portions and grooves that facilitate controlled cracking and flipping open of a pressure relief region, optimizing dimensions to enhance timely pressure relief and reduce cracking risks.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the pressure relief component is designed with a weak portion to enable cracking for pressure relief, then the pressure relief function is improved, but the reliability deteriorates due to risk of premature cracking
Solution Approach 1:
The pressure relief component is segmented into multiple functional regions: a first weak portion for controlled cracking, a second weak portion for guiding flipping, and a predetermined pressure relief region. This segmentation allows the component to perform different functions at different locations, enabling reliable pressure relief while preventing premature cracking through the second weak portion's guidance mechanism.
Solution Approach 2:
The second weak portion is pre-designed to guide the flipping open of the predetermined pressure relief region before actual pressure relief occurs. This preliminary action ensures that when cracking does occur, it follows a controlled path through the second weak portion, preventing random premature cracking and improving overall reliability.
2Loss of time
If the minimum distance L between the first weak section and the second weak portion is increased to facilitate flipping open, then the pressure relief timeliness is improved, but the device complexity increases
Solution Approach 1:
The patent optimizes the parameter L (minimum distance between first weak section and second weak portion) within a specific range to achieve the desired pressure relief timeliness. By carefully controlling this dimensional parameter, the design facilitates rapid flipping open of the pressure relief region without requiring complex additional structures, thus improving timeliness while maintaining structural simplicity.
3Speed
If the cross-sectional area S of the second weak portion is decreased to reduce resistance to flipping, then the pressure relief speed is improved, but the reliability deteriorates due to increased cracking risk
Solution Approach 1:
The second weak portion is designed with a specific cross-sectional area S that creates localized weakness only where needed for guiding the flipping motion. This local quality change allows the area to offer minimal resistance to flipping (improving speed) while the overall structure maintains sufficient strength (preventing premature cracking). The weak portion is strategically positioned and dimensioned to affect only the intended flipping behavior.
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
The design improves the reliability and timeliness of pressure relief, reducing the risk of premature cracking and enhancing the safety and performance of the battery cell during thermal events.
Implementation Method 1
the pressure relief component is configured to be capable of cracking along at least a part of the first weak portion during pressure relief of the battery cell
Implementation Method 2
the minimum distance between the first weak section and the second weak portion can be regarded as a power arm for the predetermined pressure relief region to flip open
Data Source
AI summary
A battery cell, a battery, and an electrical device are disclosed. The battery cell includes a shell with a wall portion and a pressure relief component arranged on the wall portion. The pressure relief component has a first weak portion defining a pressure relief region and a second weak portion that guides the region to flip open during venting. The first weak portion includes a weak section spaced from the second weak portion in a first direction. The spacing distance and the cross-sectional area of the second weak portion are controlled within defined ranges to ensure both effective rupture and guided flipping of the pressure relief region. This structure enables the battery cell to achieve rapid and reliable pressure relief, improving safety and stability in operation.