Cell Connecting Sheet Structure for Stable Tab-to-Terminal Joining
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Solution Overview
Problem
The existing cell connecting sheet technologies for square aluminum shell lithium batteries face issues with tab fragmentation and connection stability due to direct ultrasonic soldering, leading to potential damage and instability in the connection between the tab and terminal, affecting the overall performance and safety of the cell battery.
Innovation Solution
A cell connecting sheet design featuring a tab connecting portion with a protection sheet and a terminal connecting portion in the same plane, where the protection sheet creates an opening for the tab to prevent direct contact with the ultrasonic soldering head, ensuring stable connections and incorporating a fusing portion to prevent overheating and short-circuiting, along with soldering grooves to enhance laser soldering accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the cell connecting sheet is directly ultrasonically soldered to the tab, then the connection strength is improved, but the tab is easily fragmented and broken and stuck to the soldering head
Solution Approach 1:
The patent introduces a protection sheet as an intermediary component between the ultrasonic soldering head and the tab. This protection sheet prevents direct contact between the soldering head and the tab, thereby avoiding tab fragmentation and sticking while still allowing effective ultrasonic welding through the protection sheet to achieve strong connections
2Ease of manufacture
If the terminal connecting sheet penetrates through a terminal hole to connect the terminal, then the connection is achieved, but the stability of the connection between the tab connecting sheet and the terminal connecting sheet is damaged
Solution Approach 1:
The patent transitions from a three-dimensional penetration connection (through the terminal hole) to a two-dimensional planar connection. The terminal connecting portion is disposed in the same plane as the tab connecting sheet, eliminating the need for penetration and thereby maintaining connection stability while achieving easy assembly through planar soldering
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 ensures stable and reliable connections between the tab and terminal, preventing fragmentation and overheating, thereby enhancing the performance and safety of the cell battery by maintaining connection integrity and preventing potential fires.
Implementation Method 1
The cell connecting sheet is ultrasonically soldered to the tab
Implementation Method 2
is laser-soldered to the terminal
Data Source
AI summary
Provided are a cell connecting sheet and a cell battery. The cell connecting sheet comprises a tab connecting portion and a terminal connecting portion; the tab connecting portion comprises a tab connecting sheet and a protection sheet; a first side of the protection sheet is connected to the tab connecting sheet; a second side of the protection sheet and the tab connecting sheet form an open/closed port; the open/closed port is configured to place a tab between the tab connecting sheet and the protection sheet; and the protection sheet and the tab connecting sheet are configured to be soldered with the tab. The terminal connecting port is located on the same plane with the tab connecting sheet, and is connected to the tab connecting sheet, and the terminal connecting portion is configured to be soldered with a terminal.