Battery Cap Plate Reinforcement for Controlled Compression Shorting
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Solution Overview
Problem
During a longitudinal compression test of secondary batteries, the cap plate deforms unevenly, leading to a risk of short circuits and potential ignition or explosion due to improper bending and overheating, as the force applied causes earlier deformation of cap plate sides rather than the terminal plate and can, preventing a controlled current discharge.
Innovation Solution
A reinforcement unit is formed on one side of the cap plate to prevent premature deformation, ensuring a controlled short circuit between the terminal plate and the can by distributing the force evenly and enhancing the cap plate's strength, facilitating a safe current discharge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If the cap plate is made thinner to reduce weight, then the weight of the battery is reduced, but the cap plate deforms earlier during compression testing, preventing proper short circuit formation
Solution Approach 1:
The patent applies local quality by creating a brittle part with different mechanical properties than the rest of the cap plate. This brittle part is specifically designed to deform first during compression testing, ensuring reliable short circuit formation while allowing the rest of the cap plate to remain thin and lightweight.
Solution Approach 2:
The cap plate is segmented into two distinct regions: a brittle part and a non-brittle part. This segmentation allows each region to serve its specific function - the brittle part ensures controlled deformation for safety, while the non-brittle part maintains structural integrity and minimizes weight.
2Reliability
If a groove is formed on the inner surface of the cap plate to induce bending, then short circuit formation is facilitated, but the cap plate strength is reduced and deformation control is insufficient
Solution Approach 1:
Instead of forming a groove that weakens the entire cap plate, the patent applies local quality by creating a brittle part with specific mechanical properties in a localized region. This approach facilitates controlled deformation for short circuit formation without compromising the overall strength of the cap plate.
Data Source
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AI summary
A secondary battery, which can improve safety during a longitudinal compression test by reinforcing strength of a cap plate, is provided. In one embodiment, the secondary battery includes an electrode assembly, a can accommodating the electrode assembly, and cap plate coupled to a top portion of the can and sealing the can, wherein a reinforcement unit is formed on at least one side of the cap plate.