Rechargeable Battery Vent Plate Segmentation for Impact Resistance
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Solution Overview
Problem
Rechargeable batteries face reliability issues due to the thin vent plates, which can be damaged or broken during connection or external impacts, leading to reduced lifespan and safety concerns.
Innovation Solution
A rechargeable battery design featuring a cap assembly with a vent portion that includes a vent plate, a bending portion, and a rupture portion, where the bending portion is raised from the vent plate and provides a buffer to absorb stress, reducing the likelihood of damage or breakage during impacts or pressure increases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the vent plate is made thinner to enable it to break first during overcharge, then safety is improved, but the vent plate becomes easily damaged or broken during connection or external impact
Solution Approach 1:
The vent plate is divided into multiple regions with different thicknesses: a first region (thinner) positioned to break first during overcharge for safety, and a second region (thicker) positioned at the connection area to resist external impact and damage. This segmentation allows each region to fulfill its specific functional requirement independently.
Solution Approach 2:
Different regions of the vent plate are given different local properties (thickness values) according to their specific functional requirements. The first region has lower thickness optimized for breaking under internal pressure, while the second region has higher thickness optimized for withstanding external impact during connection and handling.
2Strength
If the vent plate thickness is increased to prevent damage during impact, then strength is improved, but the vent plate may not break first during overcharge, compromising safety
Solution Approach 1:
The vent plate is divided into multiple regions with different thicknesses: a first region (thinner) positioned to break first during overcharge for safety, and a second region (thicker) positioned at the connection area to resist external impact and damage. This segmentation allows each region to fulfill its specific functional requirement independently.
Solution Approach 2:
Different regions of the vent plate are given different local properties (thickness values) according to their specific functional requirements. The first region has lower thickness optimized for breaking under internal pressure, while the second region has higher thickness optimized for withstanding external impact during connection and handling.
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 prevents vent plate damage and reduces the risk of cracking or breaking, enhancing the battery's reliability and safety by distributing stress and absorbing external impacts.
Implementation Method 1
a bending portion that is raised from the vent plate... the bending portion provides a buffer to absorb stress, reducing the likelihood of damage or breakage during impacts or pressure increases
Data Source
AI summary
A rechargeable battery according to an exemplary embodiments includes: an electrode assembly; a case configured to accommodate the electrode assembly and having an opening at one side thereof; and a cap assembly including: a cap plate configured to close and seal the opening of the case, the cap plate having a vent portion and defining a vent opening that is configured to discharge an internal gas generated inside the case to the outside of the case, the vent portion comprising: a vent plate configured to close and seal the vent opening; and a bending portion that is raised from the vent plate; and an electrode terminal at an upper portion of the cap plate and electrically connected to the electrode assembly.