Secondary Battery Resin Sealing for Compact Design
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing laminate type batteries face challenges in reducing the size of the sealing region due to issues with heat adhesion, rigidity, and the risk of short-circuiting, making it difficult to shorten the seal width and improve structural efficiency.
Innovation Solution
A secondary battery design featuring a cylindrical section with integrated cover terminals and resins, where the cover terminals are thinner than the power generation element, and the use of resins to enhance sealing and reduce the risk of short-circuiting, allowing for a more compact structure.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the seal width is shortened to reduce battery size, then the battery dimensions are reduced, but heat adhesion quality deteriorates and sealing failure risk increases
Solution Approach 1:
The patent introduces a resin layer as an intermediary substance between the terminal and the laminate exterior body. This resin fills the sealing region and bonds the terminal to the exterior body, enabling effective sealing with a reduced seal width of 1 mm or less. The resin acts as a mediator that compensates for the reduced contact area, maintaining sealing reliability while allowing compact battery design.
2Volume of moving object
If the seal width is shortened, then battery size is reduced, but the correction force to restore tilt during heat adhesion weakens
Solution Approach 1:
The resin layer serves as a corrective intermediary that compensates for misalignment during heat adhesion. The resin's流动性 (fluidity) during the heating process allows it to flow and fill gaps caused by tilt, and after cooling, it solidifies to maintain proper positioning. This enables effective sealing even when the seal width is reduced to 1 mm or less, providing sufficient correction force despite the reduced contact area.
3Volume of moving object
If the seal width is shortened, then battery size is reduced, but the pressure per unit area during heat adhesion increases causing metal layer to dig into terminal
Solution Approach 1:
The resin layer acts as a pressure-distributing intermediary between the heat adhesion head and the terminal. During heat adhesion, the resin absorbs and distributes the applied pressure over a larger volume, preventing concentration of stress that would cause the metal layer to dig into the terminal. This allows the use of reduced seal width (1 mm or less) without increasing the risk of terminal damage.
4Volume of moving object
If the seal width is shortened, then battery size is reduced, but the cemented surface may be peeled off due to external impact
Solution Approach 1:
The patent employs a composite sealing structure consisting of the laminate exterior body, the terminal, and the resin layer. This composite construction combines the advantages of each material: the laminate exterior body provides structural integrity, the terminal provides electrical conductivity, and the resin provides flexible bonding and impact absorption. This composite approach enhances the overall bond strength and resistance to peeling under external impact, enabling reduced seal width while maintaining bonding strength.
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 design improves structural efficiency by shortening the sealing region lengths and reducing the risk of sealing failure and short-circuiting, enabling a more compact and reliable battery configuration.
Implementation Method 1
resins that are disposed between the cylindrical section and the cover terminals. The cylindrical section and the cover terminals are respectively integrated with the resins
Data Source
AI summary
A secondary battery includes: a power generation element; and an exterior part that houses the power generation element in the exterior part. The exterior part includes a cylindrical section that includes opening portions on two opposing sides, cover terminals that are disposed in the respective opening portions, and resins respectively disposed between the cylindrical section and the cover terminals. The cylindrical section and the cover terminals are respectively integrated with the resins. Power collectors of the power generation element are electrically connected with the cover terminals, respectively.