Battery Cell Adhesive Layer Structure for Drop Impact Resistance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Batteries lack sufficient drop resistance, which can lead to structural instability, tearing of electrode plates, and short circuits during impacts, posing safety risks in electronic devices.
Innovation Solution
A battery cell design incorporating a housing with strategically positioned adhesive layers that provide cushioning and restrict displacement between the electrode assembly and housing, featuring a first adhesive layer bonded to the electrode assembly's end surfaces and a second adhesive layer with varying bonding forces to absorb impact and prevent mutual pulling, thereby reducing the risk of deformation and short circuits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a single adhesive layer is used to bond the electrode assembly to the housing, then the bonding force is strong, but the electrode assembly is vulnerable to tearing and short circuits during drop impacts
Solution Approach 1:
The adhesive layer is divided into multiple segments (first adhesive layer, second adhesive layer, third adhesive layer) with different bonding strengths and positions. The first adhesive layer bonds the electrode assembly to the housing, the second adhesive layer bonds the housing to the cap, and the third adhesive layer provides additional bonding at the tail end. This segmentation allows each layer to perform its specific function, distributing the impact forces and preventing catastrophic failure during drops.
Solution Approach 2:
Different adhesive layers are applied with different bonding strengths at different locations. The first adhesive layer has strong bonding force to secure the electrode assembly, while the second adhesive layer has controlled bonding force to allow relative movement during impact. This local differentiation of adhesive properties optimizes both bonding strength and impact resistance at each location.
2Stability of the object's composition
If the adhesive layer is rigidly bonded to both the electrode assembly and housing, then structural stability is improved, but the electrode plates are prone to tearing during impact
Solution Approach 1:
The second adhesive layer is strategically positioned and designed with controlled bonding strength to act as a cushioning layer before impact occurs. During drop tests, this layer allows relative movement between the housing and cap, absorbing impact energy and reducing the transmission of shock forces to the electrode plates, thereby preventing tearing while maintaining structural stability.
3Strength
If strong bonding is applied throughout the entire adhesive layer, then the electrode assembly is securely fixed, but mutual pulling and deformation occur during drop impacts
Solution Approach 1:
The adhesive system is segmented into multiple layers with different bonding characteristics. The first adhesive layer provides strong bonding to secure the electrode assembly, while the second adhesive layer provides controlled bonding that allows relative movement. This segmentation prevents mutual pulling and deformation during drops by distributing the mechanical stresses across different layers with appropriate bonding strengths.
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 battery cell exhibits improved drop resistance, maintaining structural stability and reducing the risk of electrode plate tearing and short circuits, as demonstrated by higher pass rates in drop tests compared to conventional designs.
Implementation Method 1
The first adhesive layer is bonded to the first end surface and extends to the first surface and the second surface to bond with the first surface and the second surface
Implementation Method 2
A bonding force between the first portion and the first adhesive layer is smaller than a bonding force between the first portion and the first inner wall and smaller than a bonding force between the first adhesive layer and the first surface
Data Source
AI summary
A battery cell including an electrode assembly, a housing, and a first bonding portion. The electrode assembly includes a first end surface, and a first surface and a second surface disposed face away from each other. The housing includes a first inner wall and a second inner wall disposed opposite each other. The first bonding portion includes a first adhesive layer and a second adhesive layer. The first adhesive layer is bonded to the first end surface and extends to the first surface and the second surface to bond with the first surface and the second surface. The second adhesive layer includes a first portion, a second portion, and a third portion connected in sequence, where the second portion is located on a side of the first adhesive layer face away from the first end surface.