Lithium Battery Plastic Case With Gas Barrier Layer
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Solution Overview
Problem
Conventional lithium secondary batteries face limitations in thickness, leading to restricted capacity and energy density, and suffer from permeability issues affecting durability and manufacturing efficiency.
Innovation Solution
A lithium secondary battery design featuring a plastic case with a gas barrier layer and a pouch film cover, allowing for increased thickness without structural limitations, improved permeability resistance, and reduced manufacturing costs through injection molding and multi-layered construction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the battery thickness is increased to achieve high capacity and energy density, then the energy density is improved, but the structural limitation of conventional pouch films prevents further thickness increase
Solution Approach 1:
The battery structure is divided into multiple functional layers including outer pouch film, gas barrier layer, and inner pouch film, allowing each layer to contribute to overall thickness while maintaining structural integrity and preventing permeability issues
Solution Approach 2:
The battery employs a composite structure combining different materials (pouch film, gas barrier layer with ceramic coating) to achieve both increased thickness for capacity and improved permeability resistance for durability
2Ease of manufacture
If conventional pouch films are used, then manufacturing is simpler, but permeability issues reduce durability and require complex folding processes for thick batteries
Solution Approach 1:
The gas barrier layer is extracted as a separate functional component between the inner and outer pouch films, specifically addressing permeability issues without complicating the overall manufacturing process
Solution Approach 2:
The gas barrier layer provides localized impermeability properties at critical interfaces, preventing electrolyte leakage and dendrite penetration while maintaining the flexibility and ease of manufacture of the pouch structure
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 design achieves higher energy density, enhanced durability, and cost-effective production by eliminating the need for complex pouch forming processes, enabling compact and high-capacity battery modules.
Implementation Method 1
a plastic case which houses the electrode assembly and includes a gas barrier layer
Data Source
AI summary
The present invention provides a lithium secondary battery and a lithium secondary battery sub module including the same. The lithium secondary battery includes: an electrode assembly; a plastic case which houses the electrode assembly and includes a gas barrier layer; and a pouch film cover which seals the plastic case having the electrode assembly housed therein, such that it is possible to achieve a battery having a significantly increased thickness so as to increase the capacity thereof without structural limitation, secure durability of the battery due to having excellent resistance to permeability, and improve productivity due to a decrease in an occurrence of poor insulation. Thereby, the lithium secondary battery sub module including the lithium secondary battery may have a high energy density and may be formed in a compact shape with reduced manufacturing costs.