Battery Cell Adhesive Layer Shear Force Transfer
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Solution Overview
Problem
Commercially available battery cells face failure due to separation of the electrode assembly from the packaging bag during falls, leading to safety issues like short-circuiting and battery failure, as the existing packaging methods do not adequately prevent relative movement and shear forces.
Innovation Solution
Incorporating a first adhesive layer on the side of the electrode assembly and a second adhesive layer on the outermost surface to bond the packaging bag, with specific dimensions and types (single-sided and double-sided) to absorb and transfer shear forces, ensuring the electrode assembly remains securely attached during falls.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If packaging bags are used to accommodate electrode assemblies, then the battery cell structure is simple and easy to manufacture, but the electrode assembly separates from the packaging bag during falling causing safety failures
Solution Approach 1:
The patent introduces adhesive layers as intermediary substances between the packaging bag and electrode assembly. The first adhesive layer is applied to the packaging bag surface, and the second adhesive layer is applied to the electrode assembly surface, creating a mediated bonding system that prevents direct separation while maintaining simple packaging structure
Solution Approach 2:
The patent uses composite adhesive structures combining different adhesive layers with distinct properties. The first adhesive layer provides initial bonding to the packaging bag, while the second adhesive layer provides strong adhesion to the electrode assembly, creating a composite bonding system that resolves the contradiction between simple packaging and reliable attachment
2Reliability
If adhesive layers are added to bond the electrode assembly and packaging bag, then the bonding stability is improved, but the device complexity increases
Solution Approach 1:
The patent divides the bonding function into two separate adhesive layers with distinct roles. The first adhesive layer is segmented to be applied to the packaging bag, while the second adhesive layer is segmented to be applied to the electrode assembly, allowing each layer to be optimized for its specific function while maintaining overall system simplicity
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 described adhesive layers effectively prevent separation of the electrode assembly from the packaging bag during drops, thereby preventing safety failures such as short-circuiting and enhancing the structural integrity of the battery cell.
Implementation Method 1
a first adhesive layer and a second adhesive layer, the first adhesive layer is adhered to a side of the electrode assembly, the second adhesive layer is disposed on an outermost surface of the electrode assembly to bond the packaging bag and the electrode assembly
Data Source
AI summary
A battery cell includes an electrode assembly and a packaging bag for accommodating the electrode assembly, where the battery cell further includes a first adhesive layer and a second adhesive layer, and the first adhesive layer is adhered to a side of the electrode assembly; and the second adhesive layer is disposed on an outermost surface of the electrode assembly to bond the packaging bag and the electrode assembly, and the first adhesive layer is disposed between the electrode assembly and the second adhesive layer. A battery is further provided, including a housing and the foregoing battery cell, where the battery cell is accommodated in the housing.