Adhesive Layer on Lithium Battery Package for Safety
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Solution Overview
Problem
Lithium secondary batteries face issues with explosions or fires due to increased inner pressure from misusage, misuse, or overheating, which existing safety devices struggle to accurately control, leading to instability and high production costs.
Innovation Solution
A lithium secondary battery design featuring an electrode assembly with an anode and cathode plate, a separator, and an adhesive layer on the package surface, made from materials like acrylic resin, EVA, or rubber, which helps control internal pressure by forming a strong cohesive bond, preventing package expansion and potential explosions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an explosion-proof safety device with valve or case breakage is used, then battery safety is improved, but device complexity and manufacturing cost increase
Solution Approach 1:
The patent extracts the safety function from complex mechanical explosion-proof devices and implements it through a simple adhesive layer on the package surface. This adhesive layer prevents package expansion and breakage during overcharging or misuse, achieving safety without the complexity of valves or breakage mechanisms.
Solution Approach 2:
The patent uses a simple, inexpensive adhesive layer as the primary safety mechanism instead of complex, expensive explosion-proof devices. The adhesive layer provides sufficient safety protection through its cohesive strength, eliminating the need for sophisticated safety mechanisms.
2Reliability
If complex explosion-proof safety devices are used, then battery safety is improved, but manufacturing cost increases
Solution Approach 1:
The patent replaces expensive complex safety devices with a simple, cheap adhesive layer that can be easily applied to the package surface. This adhesive layer provides effective safety protection through its cohesive strength, significantly reducing manufacturing costs while maintaining safety.
Solution Approach 2:
The patent extracts the essential safety function from complex explosion-proof devices and implements it through a simple adhesive layer, eliminating the need for expensive valves, breakage mechanisms, and associated control systems.
3Reliability
If existing safety devices are used to control inner pressure, then some safety protection is provided, but accurate control is difficult and reliability is reduced
Solution Approach 1:
The patent employs a passive safety mechanism where the adhesive layer automatically prevents package expansion and breakage through its cohesive strength when subjected to overcharging or misuse. This self-service approach eliminates the need for active control systems, sensors, or precise pressure monitoring, achieving reliable safety without complexity.
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 adhesive layer effectively restrains package expansion and seal breakdown, preventing explosions and fires by maintaining structural integrity during overcharging or misuse, while simplifying the manufacturing process and reducing costs compared to complex safety devices.
Implementation Method 1
an adhesive layer which is formed on an outer surface of the package... the adhesive layer having strong cohesive force
Data Source
AI summary
A lithium secondary battery capable of preventing explosion or firing caused by the increase of inner pressure due to misusage is disclosed. The lithium secondary battery includes an electrode assembly having an anode plate, a cathode plate and a separator, a package having a receiving portion for receiving the electrode assembly and sealed and filled with electrolyte together with the electrode assembly, and an adhesive layer at least partially formed on an outer surface of the package. The lithium secondary battery functions as an explosion-proof safety device for preventing the package from exploding due to abrupt breakage of the package when the package is expanded due to the increase of inner pressure of the battery over a critical value.