Sealing Tape Base Sheet Shrinking for Battery Movement Prevention
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Solution Overview
Problem
Secondary batteries face issues with electrode assemblies freely moving within cylindrical cans due to external vibrations or impacts, leading to increased internal resistance and potential damage to electrode tabs, which existing technologies fail to adequately prevent.
Innovation Solution
A secondary battery design featuring a sealing tape with a directional base sheet that shrinks and deforms upon contact with the electrolyte, creating a thicker region that contacts the can's inner surface to prevent movement, combined with an adhesive layer that maintains adhesion force and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a sealing tape with directional base sheet is used, then electrode assembly movement is prevented, but the base sheet loses directionality and deforms when contacting electrolyte
Solution Approach 1:
The base sheet undergoes parameter change by losing its directional structure when contacted by electrolyte, transforming from a directional state to a non-directional state. This parameter change enables the base sheet to conform to the can inner surface and prevent electrode assembly movement effectively.
Solution Approach 2:
The base sheet transitions from a static directional structure to a dynamic non-directional structure upon electrolyte contact. This dynamic transformation allows the sealing tape to adapt its shape and provide reliable movement prevention.
2Reliability
If the base sheet is made thick to contact the can inner surface, then movement prevention is improved, but adhesion force may be reduced
Solution Approach 1:
The sealing tape structure is designed with local quality differentiation where the base sheet provides thickness and structural support for movement prevention, while the adhesive layer maintains optimal adhesion properties. This localized functional differentiation resolves the contradiction between thickness and adhesion force.
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 solution effectively prevents electrode assembly movement within the can, reducing internal resistance and minimizing damage, while maintaining adhesive properties and stability through the aging process.
Implementation Method 1
the base sheet loses directionality and is shrunk and deformed in shape by contact with the electrolyte
Implementation Method 2
a sealing tape including an adhesive layer attached to at least portion of an outer surface of the electrode assembly and contacting the external surface of the electrode assembly
Data Source
AI summary
A secondary battery and a method of manufacturing the same are disclosed. In one embodiment, the secondary battery includes an electrode assembly including an external surface, an electrolyte, a sealing tape including an adhesive layer attached to at least portion of an outer surface of the electrode assembly and contacting the external surface of the electrode assembly and a base sheet disposed on an adhesive layer and formed of a material having directionality, and a can receiving the electrode assembly, the electrolyte, and the sealing tape, wherein the base sheet loses directionality and is shrunk and deformed in shape by contact with the electrolyte, and at least portion of the base sheet contacts an inner surface of the can to prevent the electrode assembly from being freely moved within the can.