Prismatic Battery Vent Structure for Reliable Gas Discharge
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Solution Overview
Problem
Existing prismatic secondary batteries have limitations in the reliability of their gas-discharge valves, which can lead to unintended rupture or failure under increased pressure.
Innovation Solution
The prismatic secondary battery design incorporates a gas-discharge valve located in a protruding portion of the case, which is fractured when internal pressure exceeds a predetermined value, ensuring stable discharge path and improved valve reliability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the gas-discharge valve is integrated directly into the case wall, then the structure is simpler, but the reliability is reduced due to unintended rupture risk
Solution Approach 1:
The case is divided into a body portion and a separate protruding portion. The gas-discharge valve is specifically located in the protruding portion, which is a segmented structure that separates the valve function from the main case body. This segmentation allows the valve to be positioned in a dedicated region designed for pressure relief, improving reliability while maintaining structural integration.
Solution Approach 2:
The protruding portion extends in a direction away from the electrode assembly, creating a three-dimensional configuration that positions the gas-discharge valve in a different spatial dimension. This dimensional change allows the valve to be located optimally for gas discharge while maintaining a compact overall structure, resolving the contradiction between simplicity and reliability.
2Length of moving object
If the gas-discharge valve is positioned close to the electrode assembly, then the discharge path is shorter, but the reliability is reduced due to potential interference with battery components
Solution Approach 1:
The protruding portion creates a three-dimensional discharge path that extends away from the electrode assembly in a direction perpendicular to the main battery plane. This dimensional change allows for an optimized discharge path length that does not compromise reliability, as the valve is positioned in a spatial region that avoids interference with internal battery components while maintaining efficient gas venting capability.
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 enhances the reliability of the gas-discharge valve by securely routing high-temperature gases away from the battery, preventing unintended rupture and improving overall safety and performance.
Implementation Method 1
a gas-discharge valve provided in the protruding portion and fractured when pressure in the case becomes equal to or more than a predetermined value
Data Source
AI summary
In a prismatic secondary battery, a positive electrode terminal electrically connected to a positive electrode tab is provided on a third wall of a pair of third walls that faces the positive electrode tab, a negative electrode terminal electrically connected to a negative electrode tab is provided on a third wall of the pair of third walls that faces the negative electrode tab, at least one of the pair of second walls includes a base portion and a protruding portion protruding from the base portion in a direction away from a first end surface of the electrode assembly, and the protruding portion is provided with a gas-discharge valve that is fractured when pressure in a case becomes equal to or more than a predetermined value.