Button Cell Weld Layout to Prevent Terminal Plate Short Circuits
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Solution Overview
Problem
Conventional button cells face issues with short circuits due to the melting of bonding layers caused by welding heat, and the location of the welded portion at the upper part makes it difficult to prevent interference with the terminal plate and bonding layer.
Innovation Solution
A button cell design that includes a case with a through hole and a bottom plate, where the welded portion is located between the sidewall and the bottom plate, and a bonding layer that protrudes to overlap the sidewall, preventing interference and thus avoiding short circuits between the case and terminal plate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the case and cap plate are coupled by a welded portion at the upper portion, then the structural strength is improved, but the bonding layer may melt due to welding heat, causing a short circuit between the terminal plate and the case
Solution Approach 1:
The welded portion is relocated from the upper portion (where it would interfere with the terminal plate and bonding layer) to the lower portion of the case, specifically at the junction between the sidewall and bottom plate. This spatial repositioning in a different dimension eliminates the interference with the bonding layer while maintaining the structural strength provided by the welded connection between case components
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 a short circuit between the cap plate and the terminal plate is difficult to overlap the welded portion
Solution Approach 1:
The welded portion is positioned at the lower portion of the case where the sidewall and bottom plate meet, which is a different spatial dimension from the upper portion configuration. This allows the bonding layer at the upper portion to be properly positioned between the cap plate and terminal plate without interference from the welded portion, while still maintaining structural integrity through the welded connection at the lower portion
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 design effectively prevents short circuits by isolating the welded portion from the terminal plate and bonding layer, ensuring reliable operation of the button cell.
Implementation Method 1
a welded portion welding the case to the bottom plate
Implementation Method 2
a bonding layer between the case and the terminal plate, and configured to insulate and bond the case and the terminal plate
Data Source
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AI summary
A button cell (1000, 1002) includes an electrode assembly (100) including a first electrode (110), a second electrode (120), a separator (130) between the first electrode (110) and the second electrode (120), a first electrode tab (140) extending from the first electrode (110), and a second electrode tab (150) extending from the second electrode (120), a case (200) accommodating the electrode assembly (100), and including a through hole (210) exposing an upper central region of the electrode assembly (100) and an opening (220) exposing a lower portion (102) of the electrode assembly (100), a bottom plate (300) coupled to the case (200) to cover the opening (220), and connected to the first electrode tab (140), a terminal plate (400) insulated from and bonded to the case (200) to cover the through hole (210), and connected to the second electrode tab (150), and a bonding layer (500) between the case (200) and the terminal plate (400), and configured to insulate and bond the case (200) and the terminal plate (400).