Battery Packaging Film Structure for Stronger Layer Bonding
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional lithium-ion battery packaging films, such as aluminum-plastic films, lack sufficient strength to protect bare cells from external forces, leading to potential unsafe events like short circuits or heating due to direct electrode contact, and alternative solutions like steel-plastic films are difficult to produce efficiently.
Innovation Solution
A battery packaging film structure incorporating a metal layer with added nano ceramic or thermally conductive non-ceramic bonding enhancement layers and protective layers, which increases surface roughness and bonding strength, enhancing safety and thermal conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the thickness of the aluminum layer is increased to improve strength, then the strength of the battery packaging film is improved, but the film becomes relatively thick which is unfavorable to energy density improvement
Solution Approach 1:
The patent applies composite materials by combining aluminum layer with nano ceramic particles and thermally conductive non-ceramic particles to create a composite packaging film structure. This composite approach allows the film to achieve enhanced strength and thermal conductivity without increasing the aluminum layer thickness, thereby resolving the contradiction between strength improvement and volume reduction.
2Strength
If aluminum-plastic film is replaced with steel-plastic film to improve strength, then the strength is improved, but the film becomes excessively hard making packaging difficult and production efficiency very low
Solution Approach 1:
The patent applies local quality by adding nano ceramic particles and thermally conductive non-ceramic particles specifically to the aluminum layer rather than using a completely different metal material. This localized enhancement provides the necessary strength improvement while maintaining the inherent processability and flexibility of aluminum, avoiding the excessive hardness and packaging difficulties associated with steel-plastic films.
3Productivity
If conventional aluminum-plastic film is used, then the production process is simple and efficient, but the film has relatively low strength and cannot protect bare cell from external forces
Solution Approach 1:
The patent applies preliminary action by incorporating nano ceramic particles and thermally conductive non-ceramic particles into the aluminum layer during the film manufacturing process. This preliminary enhancement of the material properties allows the film to achieve superior strength and thermal conductivity before the battery assembly process, maintaining production efficiency while improving protective capabilities.
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 enhanced bonding and thermal conductivity improve the mechanical puncture strength and safety of the battery packaging film, preventing electrode contact and heat accumulation, thus ensuring safer lithium-ion battery operation.
Implementation Method 1
Because the first bonding enhancement layer is added to the upper surface of the metal layer, roughness of the upper surface of the metal layer is increased, so that strength of bonding between the first protective layer and the metal layer is increased
Implementation Method 2
Because the nano thermally conductive non-ceramic layer has good thermal conductivity, heat inside a battery can still be dissipated in time when strength of the battery packaging film and surface roughness of the metal layer are improved
Data Source
AI summary
A battery packaging film includes a metal layer, a first bonding enhancement layer, a first bonding layer, a second bonding layer, a first protective layer, and a second protective layer. The first bonding enhancement layer is located on a first surface of the metal layer. The first bonding layer is located on a surface of the first bonding enhancement layer away from the metal layer. Because the first bonding enhancement layer is added to an upper surface of the metal layer, roughness of the upper surface of the metal layer is increased to enhance strength of bonding between the first protective layer and the metal layer and minimize occurrence of unintended separation of the first protective layer from the metal layer, thereby enhancing safety of the battery packaging.