Battery Cell Cover Bonding Through Coupling Holes for Sealing
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Solution Overview
Problem
The manufacturing process of battery cells faces challenges such as poor sealing due to gaps between the can and cap during welding, which can lead to foreign substance ingress and performance degradation, and the need for improved productivity and stability.
Innovation Solution
A battery cell design that uses an adhesive member to secure the cover portion to the body case through coupling holes, eliminating the need for welding, thereby ensuring sealing and enhancing coupling force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If welding is used to seal the can and cap, then the sealing process can be completed, but poor sealing occurs due to gaps between parts and foreign substance ingress
Solution Approach 1:
An adhesive member is introduced as an intermediary substance between the can and cap to fill gaps and achieve reliable sealing. The adhesive member includes a polyolefin-based polymer that cures to form a sealed joint, preventing foreign substance ingress while accommodating dimensional variations between parts.
Solution Approach 2:
The sealing method transitions from welding (thermal process) to adhesive bonding (chemical process). The adhesive member undergoes curing parameter changes to transform from liquid/semi-solid state to solid state, creating a durable seal that is more tolerant of gaps and misalignments compared to welding.
2Reliability
If welding is used to combine the can and cap, then the sealing can be achieved, but productivity is reduced due to process complexity
Solution Approach 1:
The welding process (thermal-mechanical system) is replaced with an adhesive bonding process (chemical-mechanical system). This substitution eliminates the need for precise gap control and complex welding parameters, simplifying the manufacturing process and improving productivity while maintaining or enhancing sealing reliability.
3Ease of manufacture
If welding is used to seal the battery cell, then the assembly can be completed, but coupling force is insufficient due to gap issues
Solution Approach 1:
The adhesive member serves as a mediator that distributes mechanical loads across the bonding interface between the can and cap. This intermediary layer compensates for gaps and provides superior coupling force compared to welding, as the adhesive bonds to both surfaces and cures to form a strong joint.
4Ease of manufacture
If welding is used to combine the can and cap, then the assembly can be completed, but stability and lifetime are degraded due to foreign substance contamination
Solution Approach 1:
The adhesive member acts as a barrier that prevents foreign substances from entering the battery cell interior during assembly. By providing a continuous sealed joint that is more effective than welding at preventing contamination, the adhesive bonding process extends battery cell lifetime and improves long-term stability.
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 approach improves productivity, stability, and lifetime of the battery cell by ensuring effective sealing and increased coupling force without welding, suitable for applications in electric vehicles and energy storage systems.
Implementation Method 1
an adhesive member which combines the cover portion and the body case by heating and pressurizing at a predetermined adhesive temperature and an adhesive pressure
Implementation Method 2
an adhesive member which combines the cover portion and the body case by heating and pressurizing at a predetermined adhesive temperature and an adhesive pressure
Data Source
Figure 1
Figure 2
Figure 3A~3B
AI summary
The present disclosure relates to a battery cell including an electrode assembly; a body case including an opening on one surface and accommodating the electrode assembly therein through the opening; a coupling region located adjacent to the opening along at least a portion of a circumference of the opening in one region of the body case; a coupling hole penetrating the body case in the coupling region; a cover portion including a terminal portion electrically connecting the electrode assembly to an outside and coupled to the body case in the coupling region to cover the opening; and an adhesive member cured by being located on an inner side surface of the body case and an outer side surface of the body case in the coupling region through the coupling hole and combining the cover portion and the body case.