Battery Tab Slit Design for Controlled Deformation
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Solution Overview
Problem
The thin thickness of tabs in batteries often leads to unintended deformation, which can result in poor bonding with current collecting terminals, potentially causing issues like short circuits.
Innovation Solution
Incorporating a slit in the tab and a buckling part including the slit, which allows for controlled deformation and improved bonding with current collecting terminals by forming a stable buckling part when the terminal is connected.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the tab thickness is reduced to minimize space, then the battery size is reduced, but the tab becomes prone to unintended deformation
Solution Approach 1:
The tab is segmented by introducing slits that divide the tab into multiple regions. These slits allow the tab to deform in a controlled manner along predetermined lines, preventing random deformation while maintaining thin thickness. The buckling part formed by the slits creates discrete deformation zones that stabilize the tab structure.
Solution Approach 2:
The slits are pre-formed in the tab before assembly, creating predetermined deformation paths. When bonding occurs, the tab naturally buckles along these pre-defined slits rather than deforming unpredictably. This preliminary structuring prevents deformation issues during the bonding process.
2Productivity
If the tab is made thinner to improve energy density, then the battery efficiency is improved, but the bonding reliability with current collecting terminal deteriorates
Solution Approach 1:
The physical parameters of the tab are changed by introducing slits that modify its mechanical properties. The slits transform the tab from a rigid thin structure prone to unpredictable deformation into a flexible structure with controlled deformation characteristics, improving bonding reliability while maintaining thin thickness for high energy density.
Solution Approach 2:
The potential harm of thin tab deformation is converted into a benefit by deliberately designing the deformation path through slits. The controlled buckling along predetermined slits ensures that deformation occurs in a predictable, manageable way that actually improves bonding contact between the tab and current collecting terminal.
3Stability of the object's composition
If a rigid tab structure is used to prevent deformation, then the structural stability is improved, but the bonding flexibility with current collecting terminal deteriorates
Solution Approach 1:
The tab is designed with dynamic characteristics through the introduction of slits that allow controlled deformation. Rather than being completely rigid or completely flexible, the tab exhibits dynamic behavior - maintaining structural integrity in stable regions while allowing controlled buckling in regions with slits, achieving both stability and bonding flexibility.
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 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; the battery includes a first current collecting terminal electronically connected to the first tab; in a plan view in a thickness direction of the power generating element, the first current collecting terminal includes a base part, and a protruding part that protrudes to the first tab side on the basis of the base part; the first tab includes a slit extending from an end part T1 of the first current collecting terminal side to the first active material layer side; the slit contacts the protruding part; and the first tab includes a buckling part including the slit.