Battery Cap Plate Bonding Structure for Insulated Terminal Sealing
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Solution Overview
Problem
Conventional ultra-small rechargeable batteries face reduced bonding force between the terminal part and the case due to hetero-bonding with polymer materials, leading to potential separation issues.
Innovation Solution
A rechargeable battery design that includes a cap plate and terminal plate bonded by a thermal-fusion layer with a nickel plating layer on the cap plate and a chromium oxide passive state film on the rear surface, enhancing bonding through insulation and using a polypropylene resin for the thermal-fusion layer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a polymer material is used to bond the terminal part and the case, then insulation between the terminal part and the case is achieved, but bonding force between the terminal part and the case is reduced
Solution Approach 1:
The invention uses a composite bonding structure consisting of a polymer material layer and a thermal-fusion layer bonded to metal surfaces. This composite approach combines the insulation properties of the polymer with the strong adhesion of the thermal-fusion layer to metal, achieving both insulation and strong bonding force simultaneously.
Solution Approach 2:
The thermal-fusion layer acts as an intermediary between the polymer material and the metal terminal part/case. It provides a bonding interface that adheres strongly to both the polymer and the metal surfaces, resolving the contradiction between insulation (provided by the polymer) and bonding strength (provided by the thermal-fusion layer).
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
Improves bonding force between the cap plate and terminal plate, maintaining integrity even in high temperature and humidity conditions, ensuring effective sealing and performance.
Implementation Method 1
a thermal-fusion layer that is positioned between the cap plate and the terminal plate and insulation-bonds the cap plate and the terminal plate
Implementation Method 2
the cap plate includes a plating layer that is directly bonded to the thermal-fusion layer
Implementation Method 3
a passive state film coated on a rear surface of the plate body
Data Source
AI summary
A rechargeable battery includes: an electrode assembly including a first electrode, a second electrode, and a separator between the first electrode and the second electrode; a case that is connected to the first electrode and accommodates the electrode assembly, and includes an opening; a cap plate that is coupled to the case to cover an outer area of the opening and includes a through-hole exposing a central area of the opening; a terminal plate that is connected to the second electrode and is insulation-bonded to the cap plate so as to cover the through-hole; and a thermal-fusion layer that is positioned between the cap plate and the terminal plate and insulation-bonds the cap plate and the terminal plate, and the cap plate includes a plating layer that is directly bonded to the thermal-fusion layer.