Secondary Battery Cap Assembly Sealing Member Design
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Solution Overview
Problem
Secondary batteries are prone to abnormal operations due to contaminant permeation or damage, which existing designs fail to adequately prevent, leading to potential short circuits and safety issues.
Innovation Solution
A secondary battery design incorporating a sealing member between the cap plate and short-circuit plate, featuring a protrusion and reversible plate configuration that seals the short-circuit hole, using a rubber sealing member with ridges and furrows, and an adhesive to ensure secure contact and prevent contaminant ingress, thereby preventing abnormal operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a short-circuit hole is provided in the cap plate for electrical connection, then electrical connectivity is enabled, but contaminant permeation and short circuit risks increase
Solution Approach 1:
The short-circuit hole is segmented into multiple regions: an upper portion for electrical connection and a lower portion sealed by the sealing member. This segmentation allows the hole to simultaneously provide electrical connectivity while preventing contaminant permeation through the sealed lower portion.
Solution Approach 2:
The sealing member acts as an intermediary element inserted into the short-circuit hole, providing electrical conductivity while blocking contaminant permeation. It mediates between the need for electrical connection and the need to prevent contamination.
2Ease of manufacture
If the short-circuit plate is spaced apart from the cap plate outer surface, then assembly tolerance is improved, but sealing difficulty increases
Solution Approach 1:
The sealing member is made of flexible rubber material that can deform to accommodate spacing variations between the short-circuit plate and cap plate. This flexibility allows the sealing member to maintain effective sealing even when there are assembly tolerance variations.
Solution Approach 2:
The sealing member's cross-sectional area is designed to change under compression, allowing it to adapt to different spacing conditions. When compressed between the reversible plate and short-circuit plate, the sealing member's parameters change to ensure reliable sealing.
3Object-affected harmful factors
If a sealing member is added between the cap plate and short-circuit plate, then contaminant permeation is prevented, but device complexity increases
Solution Approach 1:
The sealing member performs multiple functions simultaneously: it provides contaminant permeation prevention, maintains electrical conductivity through the short-circuit hole, and accommodates assembly tolerance variations. This multi-functionality reduces the need for additional separate components.
Solution Approach 2:
The sealing member is made of composite rubber material that combines insulating properties with conductive fillers, allowing it to provide both sealing and electrical conductivity functions in a single component.
4Reliability
If the reversible plate is designed to reverse and contact the protrusion under pressure, then safety protection is improved, but structural complexity increases
Solution Approach 1:
The reversible plate is designed with a reversible portion that can dynamically change its contact state with the protrusion based on internal pressure conditions. Under normal conditions, the reversible portion is separated; under excessive pressure, it reverses and contacts the protrusion to trigger safety mechanisms.
Solution Approach 2:
The reversible plate automatically responds to internal pressure changes without external control, reversing and contacting the protrusion when pressure exceeds safe levels. This self-service mechanism provides safety protection without requiring external monitoring or control systems.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The design effectively prevents abnormal operations and safety issues by ensuring a secure seal between the cap plate and short-circuit plate, enhancing the battery's integrity and reliability against contaminants and damage.
Implementation Method 1
a sealing member between the cap plate and the short-circuit plate... for preventing abnormal operations of the secondary battery caused by permeation of contaminants
Implementation Method 2
The sealing member may include an adhesive
Data Source
AI summary
A secondary battery includes an electrode assembly having a first electrode plate, a second electrode plate, and a separator disposed between the first and second electrode plates, a case accommodating the electrode assembly, and a cap assembly coupled to the case, the cap assembly including a cap plate sealing the case and having a short-circuit hole, a short-circuit plate covering the short-circuit hole of the cap plate, the short-circuit plate being spaced apart from an outer surface of the cap plate, a reversible plate adjacent the short-circuit hole, and a sealing member between the cap plate and the short-circuit plate.