Battery Tab Root Reinforcement for Reliable Terminal Bonding
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Solution Overview
Problem
The bonding between tabs and current collecting terminals in batteries is often insufficient due to unintended deformation of thin tabs, leading to issues such as increased internal resistance, cycle degradation, and potential internal short circuits.
Innovation Solution
A resin layer is introduced to reinforce the root part of the tabs, ensuring stable bonding with current collecting terminals by overlapping first tabs and incorporating a curved design that enhances structural integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the tab thickness is reduced to minimize space occupation, then the battery structure becomes more compact, but the tab becomes prone to unintended deformation and bonding issues
Solution Approach 1:
A resin layer is introduced as an intermediary substance between overlapping tabs to reinforce the root part. This resin layer acts as a mediator that provides structural support to the thin tabs, preventing deformation while maintaining compact battery design. The resin layer is applied to the root part of the tab where multiple tabs overlap, creating a reinforced region that ensures reliable bonding without increasing tab thickness.
2Volume of moving object
If the tab thickness is reduced to minimize space occupation, then the battery structure becomes more compact, but the structural strength of the tab decreases
Solution Approach 1:
The resin layer is applied locally to the root part of the tab where structural reinforcement is most needed. This localized application provides enhanced strength at the critical bonding region without increasing the overall tab thickness or occupying additional space in the battery structure. The root part receives the reinforcement while the rest of the tab maintains its thin profile for compact design.
3Reliability
If a resin layer is added to reinforce the tab root part, then the bonding reliability improves, but the device complexity increases
Solution Approach 1:
The resin layer application is integrated into the existing tab assembly process, merging the reinforcement function with the tab formation process. The resin layer is applied to overlapping tabs in a manner that combines structural reinforcement with the natural layering of tabs in the battery, thereby improving bonding reliability without significantly increasing overall device complexity.
Data Source
AI summary
A main object of the present disclosure is to provide a battery with excellent bonding of tabs and current collecting terminals. The present disclosure achieves the object by providing a battery including a plurality of a power generating element, wherein: the power generating element includes a first active material layer, a second active material layer, an electrolyte layer arranged between the first active material layer and the second active material layer, a first current collector that collects currents of the first active material layer, and a second current collector that collects currents of the second active material layer; the first current collector includes a first tab including at least a root part; a plurality of the first tab is arranged to overlap with each other in a thickness direction of the power generating element; the battery includes a first current collecting terminal electronically connected to the plurality of the first tab; and in the plurality of the power generating element, a resin layer that reinforces the root part is arranged between the first tab neighboring.