Button Cell Sealing Structure to Prevent Weld-Induced Short Circuits
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Solution Overview
Problem
Conventional button cells face issues with short circuits due to the melting of bonding layers during welding, which complicates the insulation and bonding between the case and terminal plate, especially since the welded portion is located at the upper part, making it difficult to prevent interference.
Innovation Solution
The design includes a button cell with a through hole and a bottom plate that covers the opening, where the bonding layer is positioned to overlap the sidewall and protrude towards it, avoiding interference with the welded portion, and the terminal plate is connected to the second electrode tab with a protrusion that does not contact the bonding layer, ensuring insulation and preventing short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the case and cap plate are coupled by a welded portion, then the structural strength is improved, but the bonding layer may melt due to welding heat, causing a short circuit
Solution Approach 1:
The invention divides the sealing structure into two separate welded portions: a first welded portion joining the case to the bottom plate, and a second welded portion joining the case to the terminal plate. This segmentation allows each welded portion to be positioned away from the bonding layer, preventing heat interference while maintaining structural integrity.
Solution Approach 2:
The invention repositions the welded portions from a single upper location to distributed locations in different spatial dimensions. The first welded portion is at the bottom (case to bottom plate), and the second welded portion is at the side (case to terminal plate), effectively moving the welding operations away from the bonding layer's location in the vertical dimension.
2Device complexity
If the welded portion is located at the upper portion of the button cell, then the assembly is simplified, but the bonding layer preventing short circuit is difficult to overlap the welded portion
Solution Approach 1:
The invention segments the welding operations into two distinct locations: the first welded portion at the bottom (case to bottom plate) and the second welded portion at the side (case to terminal plate). This segmentation allows the bonding layer to be properly positioned between the case and terminal plate without interference from welding heat, while maintaining relatively simple assembly procedures.
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 configuration effectively prevents short circuits between the case and terminal plate by avoiding interference from the welded portion with the bonding layer, enhancing the reliability and durability of the button cell.
Implementation Method 1
a bonding layer between the case and the terminal plate, and configured to insulate and bond the case and the terminal plate
Implementation Method 2
A button cell may further include a welded portion welding the case to the bottom plate
Data Source
AI summary
A button cell includes an electrode assembly including a first electrode, a second electrode, a separator between the first electrode and the second electrode, a first electrode tab extending from the first electrode, and a second electrode tab extending from the second electrode, a case accommodating the electrode assembly, and including a through hole exposing an upper central region of the electrode assembly and an opening exposing a lower portion of the electrode assembly, a bottom plate coupled to the case to cover the opening, and connected to the first electrode tab, a terminal plate insulated from and bonded to the case to cover the through hole, and connected to the second electrode tab, and a bonding layer between the case and the terminal plate, and configured to insulate and bond the case and the terminal plate.