Battery Cover Plate Sealing for Water Ingress Isolation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Batteries face safety issues due to water ingress during use in wet conditions, leading to potential insulation failures and safety accidents.
Innovation Solution
A battery design incorporating a sealing member between the cover plate and the carrying component to seal the opening, utilizing a sealing member with a width between 0.2 mm and 50 mm, made of materials like foaming materials or rubber, to reduce water entry and enhance insulation while optimizing space and energy density.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a sealing member is added between the cover plate and carrying component to seal the opening, then water ingress is reduced and safety is improved, but the device complexity increases
Solution Approach 1:
A sealing member is introduced as an intermediary element between the cover plate and carrying component to seal the opening. This mediator prevents direct water ingress into the accommodating chamber while maintaining the structural integrity of the battery assembly, thereby improving safety without fundamentally altering the core structure.
Solution Approach 2:
The sealing member is implemented as a flexible sealing structure that can deform to accommodate manufacturing tolerances and assembly variations. This flexible approach ensures reliable sealing of the opening while keeping the design simple and adaptable to different battery configurations.
2Reliability
If the sealing member width is increased to improve sealing performance, then water ingress is reduced, but the internal space and energy density are reduced
Solution Approach 1:
The width of the sealing member is optimized to specific parameter ranges (0.2mm-50mm generally, 4mm-30mm for foaming material, 1mm-20mm for rubber) to achieve the necessary sealing performance while minimizing space occupation. This parameter optimization balances sealing effectiveness with energy density requirements.
Solution Approach 2:
The sealing member is designed with localized sealing features concentrated at the critical opening area rather than uniformly thick throughout. This allows effective sealing where needed while minimizing the overall volume occupied by the sealing member, thereby preserving internal space for energy-dense components.
3Quantity of substance
If the sealing member width is decreased to increase internal space, then energy density is improved, but sealing performance deteriorates
Solution Approach 1:
Different material options are provided for the sealing member (foaming material or rubber) with different density and sealing characteristics. Foaming material offers lower density and adequate sealing with smaller width (4mm-30mm), while rubber provides higher density and better sealing (1mm-20mm). This material selection allows optimization of both energy density and sealing performance based on specific application requirements.
Solution Approach 2:
The relationship between sealing member width and sealing performance is quantified through specific parameter ranges. By selecting appropriate width within these ranges and matching with suitable materials, the design achieves adequate sealing performance with minimized width, thereby maximizing energy density without compromising reliability.
Data Source
AI summary
A battery includes a carrying component, a battery cell, a cover plate and a sealing member. The battery cell is fixed to the carrying component, the carrying component includes a first accommodating chamber with a first opening, and the first accommodating chamber is disposed on a side of the carrying component facing away from the battery cell, the cover plate is connected to the carrying component and is adapted to cover and close the first opening, and the sealing member is at least partially disposed between the cover plate and the carrying component to seal the first opening.