Battery Cell Housing Vent Structure for Creep-Resistant Pressure Relief
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Solution Overview
Problem
Existing battery technologies face challenges in prolonging the service life due to creep issues in pressure relief mechanisms, which can lead to premature cracking and reduced reliability.
Innovation Solution
A housing design with a pressure relief region and a non-pressure relief region, where the thickness ratio is greater than 0.1 to less than 1, and a first notch at their joint, reduces stiffness gradient and facilitates effective pressure relief, thereby enhancing creep resistance and extending service life.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a pressure relief mechanism is provided in the battery housing, then pressure relief function is improved, but creep resistance deteriorates due to stiffness gradient
Solution Approach 1:
The housing employs local quality variation by creating a pressure relief region with reduced thickness (H1) compared to the non-pressure relief region (H2), where the thickness ratio H1/H2 is between 0.1 and 1. This localized thickness reduction creates a stiffness gradient that concentrates deformation in the pressure relief region, improving pressure relief function while maintaining overall structural integrity and creep resistance.
2Productivity
If the thickness ratio of pressure relief region to non-pressure relief region is increased, then pressure relief efficiency is improved, but structural strength deteriorates
Solution Approach 1:
The patent applies parameter changes by optimizing the thickness ratio (H1/H2) between the pressure relief region and non-pressure relief region to be within the range of 0.1 to 1. This specific parameter range balances pressure relief efficiency with structural strength, ensuring that the housing can effectively relieve pressure while maintaining sufficient structural integrity during normal operation.
3Reliability
If a notch is provided at the joint between pressure relief region and non-pressure relief region, then pressure relief function is improved, but stress concentration increases leading to cracking
Solution Approach 1:
The notch at the joint between the pressure relief region and non-pressure relief region serves as a localized stress concentration point that initiates controlled cracking in the pressure relief region. This local quality feature allows the housing to selectively fail in the thinner pressure relief region rather than in the thicker non-pressure relief region, improving pressure relief function while managing stress concentration through controlled deformation.
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 effectively prolongs the service life of battery cells by reducing deformation concentration and improving pressure relief efficiency, minimizing risks of fire and explosion from thermal runaway.
Implementation Method 1
the pressure relief region is configured to open with the first notch as a boundary when the pressure or temperature inside the housing reaches a threshold, so as to release the pressure inside the housing
Implementation Method 2
the stiffness gradient from the non-pressure relief region to the pressure relief region is further increased, facilitating the improvement in the creep resistance of the housing
Data Source
AI summary
A housing, a battery cell, a battery, and a power consuming device are described. The housing is provided with a pressure relief region and a non-pressure relief region surrounding the pressure relief region, and the ratio of a thickness dimension of the pressure relief region to a thickness dimension of the non-pressure relief region is greater than or equal to 0.1 and less than 1; and the housing is further provided with a first notch, and the first notch is provided at the joint between the pressure relief region and the non-pressure relief region, wherein the pressure relief region is configured to open with the first notch as a boundary when the pressure or temperature inside the housing reaches a threshold, so as to release the pressure inside the housing. In this way, the thicknesses of two sides of the first notch are unequal, thereby reducing the stiffness gradient; moreover, the pressure relief region is thin and accordingly can absorb and coordinate deformation effectively.