Secondary Battery Tape Remainder Shock Absorption
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Solution Overview
Problem
Secondary battery electrode assemblies are prone to damage from external shocks due to excessive pressure during tape attachment, and inadequate pressure can lead to interference with the battery case, affecting the assembly's integrity and manufacturing efficiency.
Innovation Solution
A secondary battery design where the sealing tape extends beyond the lower surface of the electrode assembly, forming a remainder that is compressed and positioned between the case bottom and the electrode assembly, creating a shock-absorbing space by being bent to reduce external shock and simplify the manufacturing process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If excessive pressure is applied when attaching the lower tape, then the lower tape is securely fixed, but the lower portion of the separator is pushed up and the electrode assembly may be damaged due to external shock
Solution Approach 1:
The patent introduces a lower tape as an intermediary component between the electrode assembly and the external environment. This lower tape absorbs and distributes external shocks, preventing direct transmission to the vulnerable lower portion of the electrode assembly while maintaining secure attachment through controlled pressure application.
Solution Approach 2:
The lower tape is positioned in advance at the lower portion of the electrode assembly to provide cushioning protection before external shocks occur. This pre-positioned protective layer ensures that when shocks occur, the electrode assembly is already protected, preventing damage to the separator and other internal components.
2Object-affected harmful factors
If low pressure is applied when attaching the lower tape, then the electrode assembly is protected from damage, but the electrode assembly becomes thick due to the lower tape and interference with the case may occur
Solution Approach 1:
The patent optimizes the pressure parameter during lower tape attachment to achieve the right balance. By controlling the pressure within a specific range, the lower tape is securely fixed without applying excessive force that would push up the separator, while still maintaining the electrode assembly's thickness within acceptable limits to avoid case interference.
Solution Approach 2:
The lower tape is applied with differentiated pressure distribution - higher pressure at the edges for secure fixation and lower pressure at the center to avoid pushing up the separator. This local quality approach ensures reliable attachment while maintaining the proper thickness profile of the electrode assembly.
3Object-affected harmful factors
If additional protection tape is attached to prevent damage, then shock protection is improved, but the number of components increases and manufacturing complexity increases
Solution Approach 1:
The lower tape is designed to perform multiple functions simultaneously: it secures the electrode assembly, provides shock protection, and maintains proper thickness control. By combining these functions into a single component, the patent eliminates the need for separate protection tapes, reducing component count while maintaining comprehensive protection.
Solution Approach 2:
The protective function previously requiring a separate protection tape is merged into the lower tape itself. The lower tape is designed with sufficient width, strength, and cushioning properties to provide both attachment and protection functions, consolidating multiple components into one and simplifying the manufacturing process.
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 reduces damage from external shocks and simplifies the manufacturing process by reducing the number of components and eliminating the need for additional protection tapes, thereby improving yield and assembly integrity.
Implementation Method 1
the sealing tape fixes the side tape to the side surface of the electrode assembly through a thermocompression process
Implementation Method 2
compressing the remainder by a press outside a lower surface of the electrode assembly
Data Source
AI summary
A secondary battery, including an electrode assembly having a positive sheet and a negative sheet and a separator is interposed therebetween; a tape to wrap an outer surface of the electrode assembly; and a case to receive the electrode assembly. After a remainder of the tape is formed to extend beyond a lower surface of the electrode assembly and joined by a press, the remainder is positioned between a bottom surface of the case and the lower surface of the electrode assembly. According to the embodiment of the present invention, since a junction portion of the tape extended to the outside of the lower surface of the electrode assembly is bent and inserted into the case, a shock-absorbing action is provided to reduce an external shock applied to the secondary battery. Further, an additional tape process can be omitted to simplify a manufacturing process of the secondary battery.