Secondary Battery Cap Plate Recessed Grooves
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Solution Overview
Problem
Secondary batteries face safety issues due to deformation of cap plates caused by external forces, such as vibration, which can lead to physical deformation and a risk of short-circuiting during overcharge, compromising safety.
Innovation Solution
The design incorporates recessed grooves on the cap plate for improved coupling strength and bending strength, featuring a short-circuit mechanism that inverts to prevent deformation and reduce unused case volume, with insulation members and terminal units that enhance structural integrity and gas release.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the cap plate is made thinner to reduce unused volume, then the volume of the battery is reduced, but the bending strength and coupling strength of the cap plate deteriorates, leading to deformation under external forces
Solution Approach 1:
The cap plate is segmented by forming recessed grooves that divide the plate into multiple regions. These grooves create structural compartments that enhance the overall bending strength and coupling strength of the cap plate while maintaining a thin profile, thereby reducing unused volume without sacrificing structural integrity.
Solution Approach 2:
Instead of increasing the thickness of the cap plate to improve strength, the invention introduces recessed grooves that add structural complexity in the vertical dimension. This dimensional approach creates multiple levels and reinforcement zones within the same overall thickness, enhancing strength without increasing volume.
2Length of moving object
If the cap plate is made thinner to reduce battery height, then the overall height is reduced, but the coupling strength of terminal plates to the cap plate deteriorates, causing rotation and vibration
Solution Approach 1:
The recessed grooves segment the cap plate structure, creating distinct coupling zones that provide enhanced mechanical interlocking for terminal plates. This segmentation allows the thin cap plate to maintain strong coupling points without requiring increased overall thickness.
Solution Approach 2:
The recessed grooves introduce curved surfaces and non-planar geometries into the cap plate structure. These curved features increase the surface area and mechanical interlocking capability between the cap plate and terminal plates, enhancing coupling strength while maintaining a compact height.
3Volume of moving object
If the cap plate is made thinner, then the unused volume is reduced, but the deformation resistance under external forces such as vibration deteriorates
Solution Approach 1:
The recessed grooves divide the cap plate into multiple structural zones that can independently resist deformation. This segmentation creates a more stable overall structure that maintains its composition and geometry under external forces like vibration, even when the plate is thin.
Solution Approach 2:
The recessed groove structure creates a composite-like architecture within the homogeneous cap plate material. This internal composite structure provides enhanced deformation resistance and stability, allowing the thin cap plate to maintain its structural composition under external forces.
Data Source
AI summary
A secondary battery includes: an electrode assembly; a case accommodating the electrode assembly and having an opening at one side thereof; a cap plate closing the opening of the case and having a first recessed groove at one end thereof and a second recessed groove at another end thereof, both the first and second recessed grooves being at an outer surface of the cap plate; a first terminal unit including: a first electrode terminal electrically connected to a first electrode plate and protruding outside of the case; a first terminal plate electrically connected to the first electrode terminal; and an insulation member coupled to the cap plate in the first recessed groove and surrounding peripheral surfaces and a bottom surface of the first terminal plate; and a second terminal unit electrically connected to the second electrode plate and coupled to the cap plate in the second recessed groove.