Insulating Bag Coupling for Secondary Battery Leakage Prevention
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Solution Overview
Problem
Secondary batteries face challenges in preventing electrolyte leakage, which can lead to performance issues and safety concerns, especially in high-capacity applications like electric vehicles.
Innovation Solution
The design incorporates an insulating bag that accommodates the electrode assembly and is coupled to the cap plate, with connection members electrically connected to the electrode terminals, and a cap plate with a safety vent and electrolyte injection hole, to prevent electrolyte leakage through thermal pressing and secure assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the insulating bag is coupled to the cap plate using conventional methods, then assembly is simple, but electrolyte leakage occurs
Solution Approach 1:
The insulating bag is divided into a fixing part and a finishing part, with the fixing part specifically designed to couple to the cap plate. This segmentation allows the bag to provide both secure attachment and electrolyte containment without requiring complex additional components.
Solution Approach 2:
The insulating bag combines multiple functions: electrical insulation, electrolyte containment, and mechanical coupling to the cap plate. By merging these functions into a single component, the design achieves reliable electrolyte containment without increasing overall device complexity.
2Reliability
If connection members are assembled to the insulating bag, then electrical connection is achieved, but assembly complexity increases
Solution Approach 1:
The connection members serve dual purposes: providing electrical connection between the electrode assembly and external terminals, and serving as structural attachment points to the insulating bag. This multi-functionality reduces the number of separate components needed.
Solution Approach 2:
The connection members are positioned and integrated within the insulating bag structure, with the bag enveloping and securing the connection members. This nested arrangement simplifies the overall assembly by having components fit within and support each other.
3Ease of operation
If the insulating bag has an opening for connection members, then electrical connection is enabled, but leakage risk increases
Solution Approach 1:
The insulating bag has different structural qualities at different locations: the fixing part provides a sealed coupling to the cap plate, the opening area provides controlled access for connection members, and the finishing part provides overall containment. This local differentiation allows both access and containment.
Solution Approach 2:
The opening in the insulating bag is positioned and sized to serve as an intermediary passage that allows connection members to pass through while maintaining electrolyte containment. The opening acts as a controlled interface rather than a complete breach in the containment structure.
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
This configuration effectively prevents or minimizes electrolyte leakage, enhancing the safety and performance of secondary batteries by ensuring secure containment and easy assembly.
Implementation Method 1
The upper part of the insulating bag having an opening is coupled to a lower surface of the cap plate
Data Source
AI summary
A secondary battery includes an electrode assembly including a first electrode plate including a first non-coating portion, a second electrode plate including a second non-coating portion, and a separator between the first and second electrode plates; an insulating bag accommodating the electrode assembly and including first and second connection members electrically connected to the first and second non-coating portions, respectively; a case accommodating the electrode assembly and the insulating bag; a cap plate sealing an opening of the case; and first and second electrode terminals electrically connected to the first and second connection members, respectively. An upper part of the insulating bag having an opening is coupled to a lower surface of the cap plate.