Electrode Assembly Finishing Tape for Insulation and Plate Assembly
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Solution Overview
Problem
Secondary batteries face challenges in concurrently securing vibration characteristics and insulation functions for their electrode assemblies, while also simplifying the installation of current collection plates.
Innovation Solution
A secondary battery design incorporating a finishing tape with a fixing member made of oriented polystyrene (OPS) or thermoplastic vulcanizate (TPV) and an insulation member made of insulating materials like polyethylene terephthalate (PET), polypropylene (PP), or polyimide (PI), which provides both vibration and insulation functions, and allows easy installation of current collection plates by limiting the adhesive layer to the circumferential surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate fixing tape and insulation tape are used for the electrode assembly, then vibration characteristic and insulation function can be secured independently, but device complexity and processing time increase
Solution Approach 1:
The patent combines the fixing tape and insulation tape into a single integrated finishing tape that simultaneously provides both vibration fixation and insulation functions. The finishing tape includes a fixing member made of OPS or TPV and an insulation member made of insulating material, which are integrally formed through an adhesive layer, thereby securing both vibration characteristic and insulation function with one component instead of separate tapes.
Solution Approach 2:
The finishing tape is designed as a multi-functional component that performs multiple roles: it acts as both a fixing member to secure vibration characteristics and an insulation member to provide electrical insulation. This universal component replaces the need for separate specialized tapes, simplifying the overall structure and reducing processing steps.
2Strength
If adhesive layer is formed over the entire finishing tape including the second region, then strong adhesion is achieved, but current collection plate installation becomes difficult
Solution Approach 1:
The adhesive layer is selectively applied only to the first region of the finishing tape that surrounds the circumferential surface of the electrode assembly, while the second region that surrounds the space beyond the upper end of the electrode assembly is left without adhesive. This local differentiation provides strong adhesion where needed for fixation while maintaining ease of operation for current collection plate installation in the non-adhesive second region.
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 design effectively secures both vibration and insulation characteristics for the electrode assembly, reduces processing costs and time, and facilitates easy installation of current collection plates by using a single finishing tape with a strategically placed adhesive layer.
Implementation Method 1
a first region which has an adhesive layer formed thereat to surround the circumferential surface of the electrode assembly
Data Source
AI summary
An embodiment of the present invention provides a secondary battery capable of concurrently securing a vibration characteristic and an insulation function of an electrode assembly by using one finishing tape. To this end, a secondary battery according to an embodiment of the present invention may comprise: an electrode assembly including a first electrode plate, a second electrode plate, and a separator interposed between the first electrode plate and the second electrode plate; a can for receiving the electrode assembly; a cap assembly for sealing the can; a first current collection plate provided above the electrode assembly and electrically connected to the first electrode plate and the cap assembly, respectively; a second current collection plate provided under the electrode assembly and electrically connected to the second electrode plate and the can, respectively; and a finishing tape having a first region which has an adhesive layer formed thereat to surround the circumferential surface of the electrode assembly, and a second region which can surround a space beyond the upper end of the electrode assembly.