Secondary Battery Vent Plate Notches for Pressure-Driven Deformation
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Solution Overview
Problem
Secondary batteries experience significant deformation due to increased internal pressure, which can lead to safety hazards.
Innovation Solution
A vent plate design with specific notches and a bridge structure that allows controlled pressure release, reducing deformation by facilitating controlled venting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the internal pressure of the case increases, then the energy storage capacity of the battery is improved, but the deformation amount of the vent plate increases causing safety hazards
Solution Approach 1:
The vent plate is segmented into multiple regions through notches, creating a structured design that allows controlled deformation in specific areas while maintaining overall structural integrity. This segmentation enables the vent plate to manage internal pressure effectively without excessive deformation that could compromise safety.
Solution Approach 2:
Different regions of the vent plate have different structural properties through the implementation of notches at specific locations. The notches create areas with varying thickness and flexibility, allowing the vent plate to locally accommodate pressure changes while maintaining global structural stability and preventing hazardous deformation.
2Reliability
If the vent plate structure is made more complex with notches and bridges, then the control over pressure release is improved, but the manufacturing complexity increases
Solution Approach 1:
The vent plate is divided into segments by notches, creating a structured design that allows controlled deformation in specific areas while maintaining overall structural integrity. This segmentation enables the vent plate to manage internal pressure effectively without excessive deformation that could compromise safety.
Solution Approach 2:
The notches modify the geometric parameters of the vent plate, creating regions with different thicknesses and flexibilities. This parameter variation allows the structure to control pressure release behavior without requiring complex external mechanisms, balancing manufacturing feasibility with functional performance.
Data Source
AI summary
A secondary battery and a battery pack are disclosed. A secondary battery includes a case including an opening, an electrode assembly in the case, a cap up arranged in the opening, a cap down facing the cap up and connected to the electrode assembly, a vent plate between the cap up and the cap down and including a first vent surface and a second vent surface that are opposite to each other, a first notch formed concavely from the first vent surface toward the second vent surface, and a second notch formed concavely from the second vent surface toward the first vent surface.