Laminate Power Storage Element Terminal Protection
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
The laminate-type power storage elements face challenges during thermocompression bonding, where the electrode body can be damaged, and there is a risk of short circuits between electrode terminals, especially when used in thin electronic devices like card-type electronic devices.
Innovation Solution
A laminate-type power storage element with a support part made of insulating, heat-resistant resin is formed on the electrode terminal plates, covering up to their tips, which prevents damage during thermocompression bonding and reduces the likelihood of short circuits by acting as a barrier during the bonding process.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If thermocompression bonding is performed to implement the power storage element to the circuit board, then adhesion strength is improved, but the electrode body may be damaged and short circuits may occur
Solution Approach 1:
An insulating resin layer is introduced as an intermediary between the electrode terminal plate and the electrode body. This resin layer serves as a protective barrier that prevents direct heat transfer to the electrode body during thermocompression bonding, eliminating the risk of short circuits while still allowing adequate adhesion to be achieved.
Solution Approach 2:
The insulating resin layer is formed on the electrode terminal plate before the thermocompression bonding process. This preliminary protective action ensures that when heating subsequently occurs during bonding, the electrode body is already protected from thermal damage that could cause short circuits.
2Length of moving object
If the power storage element is made thinner for card-type electronic devices, then device thinness is improved, but the risk of electrode body damage during bonding increases
Solution Approach 1:
The insulating resin layer acts as a thermal barrier that protects the electrode body from excessive heat during bonding. This protection is particularly important for thin power storage elements where the electrode body is more vulnerable to thermal damage, enabling safe bonding without compromising the thin profile.
3Reliability
If heat-resistant resin is applied to the electrode terminal plate, then protection from thermal damage is improved, but manufacturing complexity increases
Solution Approach 1:
The resin material undergoes a phase change from an unhardened liquid or soft state during application to a hardened solid state after curing. This parameter change allows the resin to be easily applied in an unhardened state and then transformed into a protective layer, simplifying the manufacturing process while maintaining thermal protection.
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 body damage and short circuits during implementation to the circuit board, enhancing the reliability and stability of the power storage element, as demonstrated by improved adhering strength and no voltage drop in tests.
Implementation Method 1
a support part that is made with a film shaped resin having insulating and heat-resistant properties is formed on principal surface sides of the electrode terminal plates
Implementation Method 2
hardening the resin while the electrode terminal plates are in states pressed against the face to which the resin is applied
Data Source
AI summary
A laminate-type power storage element, including an exterior body that is formed in a flat bag shape, and an electrode body that has a sheet-shaped positive electrode and a sheet-shaped negative electrode layered via a separator and that is sealed inside the exterior body together with an electrolytic solution, wherein electrode terminal plates of the positive electrode and the negative electrode are guided in an identical direction from a predetermined margin of the exterior body to an outside of the exterior body, and a support part that is made with a film shaped resin having insulating and heat-resistant properties is formed on principal surface sides of the electrode terminal plates at a region that is along the predetermined margin and covers up to tip ends of the electrode terminal plates.