Cylindrical Battery Can Coating for Insulation and Heat Resistance
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Solution Overview
Problem
Existing cylindrical secondary batteries face challenges in insulating the electrode assembly from the can while maintaining heat resistance and maximizing internal space for increased capacity.
Innovation Solution
A cylindrical secondary battery design featuring a can with a first coating layer made of an organic/inorganic hybrid coating solution on its inner surface to insulate the electrode assembly and improve heat resistance, and a second coating layer on the outer surface to further enhance insulation around the terminal hole.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an insulating layer is added between the electrode assembly and the can, then insulation is improved, but the internal space of the battery is reduced
Solution Approach 1:
The patent applies a thin film coating layer (first coating layer) on the inner surface of the can and insulating tapes wrapped around the electrode assembly. These thin insulating layers provide the necessary electrical insulation between the electrode assembly and the can while occupying minimal space, thus resolving the contradiction between insulation requirements and internal space utilization.
2Temperature
If the thickness of the can is increased to improve heat resistance, then heat resistance is improved, but the internal space for electrode assembly is reduced
Solution Approach 1:
The patent applies a thin film coating layer (first coating layer) on the inner surface of the can that provides thermal insulation properties. This thin film approach improves heat resistance without significantly increasing the can thickness, thereby maintaining the internal space for the electrode assembly while achieving the desired thermal protection.
3Reliability
If insulation measures are added to prevent electrical contact between can and electrode assembly, then insulation is improved, but device complexity increases
Solution Approach 1:
The patent uses thin film coating layers applied directly to the inner surface of the can and insulating tapes wrapped around the electrode assembly. These simple, straightforward insulation measures provide effective electrical isolation without introducing complex structural modifications, thus improving insulation while maintaining relatively simple device architecture.
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 solution effectively insulates the electrode assembly from the can, improves heat resistance, and increases the internal space of the battery, leading to enhanced capacity and reduced costs.
Implementation Method 1
a first coating layer which is provided on at least a portion of an inner surface of the can
Implementation Method 2
improve heat resistance of the can
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
Described is a cylindrical secondary battery (100) in which an inner surface of a can (110) is coated to insulate an electrode assembly (120) and the can (110) from each other and to improve heat resistance of the can (120). The cylindrical secondary battery (100) may include an electrode assembly (120), a can (110) in which the electrode assembly (120) is accommodated and of which one end is opened so as to be electrically connected to the electrode assembly (120), a cap plate (160) electrically connected to the electrode assembly (120), and a rivet terminal (150) insulated from the can (110) and the cap plate (160), which may be configured to seal one end of the can (110) and which may be insulated from the can (110). A first coating layer (180) may be provided on at least a portion of an inner surface of the can (110).