Adhesive Layer Traps Foreign Matter in Secondary Battery Cell
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Solution Overview
Problem
Secondary battery cells, such as lithium-ion batteries, face internal short-circuiting issues due to foreign matter like metal particles in the electrolyte, which are not effectively prevented by existing structures, leading to performance failures.
Innovation Solution
Incorporating an adhesive layer within the battery cell container that comes into contact with the electrolyte to trap foreign matter, ensuring it does not reach the electrodes and cause short-circuiting, with the adhesive layer being strategically positioned to encircle the electrode group or attached to the separator for enhanced protection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an adhesive layer is added to trap foreign matter, then reliability is improved, but device complexity increases
Solution Approach 1:
The adhesive layer acts as an intermediary component between the electrolyte and the electrodes. It traps foreign matter (metal particles) present in the electrolyte, preventing these particles from causing short-circuits between the positive and negative electrodes. This mediator approach resolves the contradiction by adding a targeted functional layer that improves reliability without requiring complete redesign of the battery structure.
Solution Approach 2:
The adhesive layer is implemented as a thin film structure that can be applied to existing battery components such as the separator or the inner wall of the battery container. This thin film approach allows the foreign matter trapping function to be added with minimal increase in device complexity, as the layer occupies minimal space and can be integrated into the existing battery cell structure.
2Reliability
If the adhesive layer is exposed to electrolyte to trap foreign matter, then reliability is improved, but manufacturing precision requirements increase
Solution Approach 1:
The adhesive layer is applied to the separator or battery container wall before the battery is assembled and filled with electrolyte. This preliminary application ensures that the adhesive layer is already in its final position and exposed to the electrolyte when the battery operates, eliminating the need for complex positioning mechanisms during assembly and reducing manufacturing precision requirements.
Solution Approach 2:
The adhesive layer is combined with existing battery components such as the separator or the inner wall coating. By merging the foreign matter trapping function with components that are already present in the battery structure, the invention avoids the need for separate positioning and installation processes, thereby reducing manufacturing precision requirements while maintaining reliability improvement.
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 adhesive layer effectively captures foreign matter, preventing short-circuiting and ensuring the battery cell maintains required voltage levels, thereby enhancing performance and reliability.
Implementation Method 1
an adhesive layer for trapping foreign matter present inside the battery cell container is disposed in the battery cell container by exposing at least part of the adhesive layer so as to allow the adhesive layer to come into contact with the electrolyte
Data Source
AI summary
The present invention is a secondary battery, including: an electrode group that includes a positive electrode and a negative electrode, an electrolyte, and a battery cell container that contains the electrode group and the electrolyte and that is sealed, wherein: an adhesive layer for trapping foreign matter present inside the battery cell container is disposed in the battery cell container by exposing at least part of the adhesive layer so as to allow the adhesive layer to come into contact with the electrolyte.