Pouch Cell Tab Assembly With Protective Member for Weld Stability
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Solution Overview
Problem
Ultra-thin electrochemical apparatuses face issues with tab assembly detachment due to damage during welding, leading to safety concerns such as burrs, abnormal protrusions, and cycling performance degradation.
Innovation Solution
Incorporating a soft package film, an electrode assembly, and a first protective member, where the electrode assembly includes extension portions stacked along a direction, and the protective member is welded to form an adapting portion with a tab, reducing damage during welding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If tab layers are welded directly to the welding base, then welding efficiency is improved, but the tab layers are prone to damage and detachment
Solution Approach 1:
The patent introduces a protective member as an intermediary component between the tab layer and the welding base. This protective member receives the welding force during the welding process, preventing direct contact between the welding base and the tab layer, thereby avoiding damage to the tab layer while maintaining welding efficiency.
Solution Approach 2:
The protective member is positioned in advance before welding to cushion and absorb the welding force. By placing this protective component beforehand, the tab layer is pre-protected from the harmful effects of direct welding contact, preventing damage before it occurs.
2Quantity of substance
If ultra-thin design is implemented, then energy density is improved, but manufacturing precision requirements increase
Solution Approach 1:
The protective member serves as an intermediary that simplifies the welding process for ultra-thin tab assemblies. By mediating the welding force transmission, it reduces the precision requirements for positioning and welding the thin tab layers, making ultra-thin design more manufacturable.
Solution Approach 2:
The protective member changes the physical parameters of the welding interface by providing a larger, more robust surface for welding force application. This parameter change allows the welding process to be performed with lower precision requirements while still achieving reliable joints in ultra-thin structures.
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 protective member reduces the probability of detachment, enhancing the safety of the electrochemical apparatus by minimizing burrs and performance degradation.
Implementation Method 1
the other ends of the plurality of first extension portions and the first protective member are welded to form a first adapting portion
Data Source
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AI summary
An electrochemical apparatus includes a soft package film, an electrode assembly (2), a first tab (3), and a first protective member (4). The electrode assembly (2) is accommodated within the soft package film, and the electrode assembly (2) includes an electrode body (21) and a plurality of first extension portions (22). One end of each of the plurality of first extension portions (22) is connected to the electrode body (21), the plurality of first extension portions (22) are sequentially stacked along a first direction, the other ends of the plurality of first extension portions (22) are stacked on the first protective member (4), and the other ends of the plurality of first extension portions (22) and the first protective member (4) are welded to form a first adapting portion. One end of the first tab (3) is welded to the first adapting portion, and another end of the first tab (3) extends out of the soft package film.