Multi-layer Vent Plating Layer Oxidation Prevention
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Solution Overview
Problem
Rechargeable batteries face issues with vent oxidation and punch lifespan due to single punching operations, which can lead to premature failure and safety risks.
Innovation Solution
The rechargeable battery design incorporates a vent with multiple ends and a plating layer to prevent oxidation and reduce punching force, extending the punch lifespan and ensuring safe gas discharge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a single punching operation is used to form the vent, then the vent can be formed quickly and easily, but the plating layer becomes damaged and the surface becomes rough causing oxidation
Solution Approach 1:
The vent formation process is divided into multiple punching operations instead of a single operation. The punch creates the vent in stages, with each operation removing a portion of material. This segmentation reduces the force required in each individual operation, preventing plating layer damage and surface roughness that would lead to oxidation, while still achieving complete vent formation.
2Productivity
If a single strong punching operation is used to form the vent, then the vent can be formed completely in one step, but the impact shortens the lifespan of the punch
Solution Approach 1:
The vent formation is achieved through multiple punching operations rather than one strong operation. By dividing the material removal into several steps, the impact force on the punch in each operation is significantly reduced. This extends the operational lifespan of the punch while still completing the vent formation process efficiently.
3Ease of manufacture
If the vent surface is exposed without plating layer protection, then the manufacturing process is simpler, but the vent oxidizes during use
Solution Approach 1:
A plating layer is applied to the vent surface in advance, before the punching operation. This preliminary protective coating prevents oxidation during and after the vent formation process. The plating layer is designed to withstand the multi-step punching process while providing continuous protection against oxidation, ensuring long-term reliability without significantly complicating the manufacturing process.
Data Source
AI summary
One aspect of the present invention provides a rechargeable battery that is capable of preventing a vent from being oxidized by preserving a plating layer of a surface of a vent.An exemplary embodiment of the present invention provides a rechargeable battery, including: an electrode assembly for performing charging and discharging operations; a case for accommodating the electrode assembly; and a cap assembly combined to an opening of the case and sealing the case. The case includes a vent at one side, and the vent has a plurality of ends in a thickness direction of the case and includes a plating layer on its surface.