Rechargeable Battery Insulator Fluid Recess Corrosion
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Solution Overview
Problem
Rechargeable batteries face issues with electrolyte fluid permeation into internal spaces, leading to electrode terminal corrosion due to limitations in sealing materials, which affects their performance and longevity.
Innovation Solution
Incorporating an insulator with a fluid receiving recess and outlet between the electrode terminal and cap plate to induce and discharge electrolyte fluid, thereby preventing its permeation and reducing corrosion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If internal sealing materials are used to prevent electrolyte fluid permeation, then the sealing performance is improved, but the complexity of the battery structure increases due to additional sealing components and design requirements
Solution Approach 1:
The insulator serves as an intermediary component between the electrode terminal and cap plate, providing both sealing function and electrical insulation. The insulator includes a fluid receiving recess that captures electrolyte fluid and prevents it from reaching the electrode terminal, while also electrically isolating the terminal from the cap plate.
Solution Approach 2:
The insulator performs multiple functions simultaneously: it provides electrical insulation between the electrode terminal and cap plate, seals against electrolyte fluid permeation through the fluid receiving recess, and structurally supports the electrode terminal assembly. This multi-functionality reduces the need for separate sealing components.
2Object-affected harmful factors
If the space between electrode terminal and cap plate is sealed to prevent electrolyte permeation, then electrode terminal corrosion is reduced, but the manufacturing precision requirements increase due to tight tolerances needed for effective sealing
Solution Approach 1:
The insulator incorporates a fluid receiving recess that acts as a porous or cavity-based trapping mechanism. This recess captures electrolyte fluid that attempts to permeate through, preventing direct contact with the electrode terminal while accommodating manufacturing variations through the volumetric nature of the recess rather than requiring precise gap control.
Solution Approach 2:
The fluid receiving recess is pre-formed in the insulator to anticipate and capture electrolyte fluid before it can reach the electrode terminal. This preliminary trapping action prevents corrosion without requiring the sealing interface to maintain precise tolerances under operating conditions.
3Device complexity
If a simple insulator design is used between electrode terminal and cap plate, then the device complexity is reduced, but the ability to prevent electrolyte fluid permeation deteriorates
Solution Approach 1:
The insulator features localized structural variations, specifically the fluid receiving recess positioned at the interface where electrolyte permeation is most likely to occur. This local modification provides enhanced sealing capability exactly where needed, rather than requiring complex features throughout the entire insulator structure.
Data Source
AI summary
A rechargeable battery includes: an electrode assembly configured to perform charging and discharging; a case enclosing the electrode assembly; a cap plate coupled to an opening of the case; an electrode terminal engaging a terminal hole of the cap plate; and an insulator between the cap plate and the electrode terminal, wherein the insulator comprises: a fluid receiving recess at a side of the electrode terminal to receive fluid, and an outlet extending through the insulator from the fluid receiving recess to discharge the received fluid.