Cap-Up Grooves for Secondary Battery Gas Venting
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Solution Overview
Problem
Secondary batteries face safety issues due to increased internal pressure and temperature from abnormal conditions like short-circuits or over-charging, which can lead to gas generation and potential ignition, compromising their performance and lifespan.
Innovation Solution
The design incorporates a cap assembly with a safety vent and grooved cap-up that allows for easy release of internal gases, preventing chain ruptures and explosions by rupturing when safety vents operate, thereby stabilizing the battery.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the cap-up is made strong and intact to maintain battery integrity, then structural strength is improved, but gas release during safety vent operation becomes difficult, leading to increased internal pressure and potential explosions
Solution Approach 1:
The grooves are pre-formed on the cap-up surface before the safety vent operates. When abnormal conditions cause the safety vent to rupture, the gases can immediately escape through these pre-prepared grooves, preventing pressure buildup and explosions while maintaining the overall structural integrity of the cap-up
Solution Approach 2:
The cap-up surface is segmented into multiple grooves that create controlled pathways for gas escape. These grooves divide the cap-up structure into sections that can deform and release pressure independently, allowing the overall structure to remain intact while enabling effective gas venting
2Object-generated harmful factors
If the cap-up is designed to rupture easily to release gases, then gas release becomes easy, but structural strength decreases, potentially causing uncontrolled chain ruptures
Solution Approach 1:
The grooves are located at specific positions on the cap-up surface where controlled rupture is desired. The cap-up maintains high structural strength in areas without grooves while having localized weak points at the grooves where gas can escape, achieving both strength and controlled gas release
Solution Approach 2:
The grooves act as intermediary structures that mediate between the strong cap-up structure and the need for gas release. They provide a controlled pathway that allows gases to escape without compromising the overall structural integrity, preventing uncontrolled chain ruptures
3Object-generated harmful factors
If grooves are added to the cap-up to facilitate gas release, then gas release becomes easier, but device complexity increases
Solution Approach 1:
The grooves create a porous-like structure on the cap-up surface, providing multiple pathways for gas escape. This approach achieves effective gas release through a relatively simple geometric modification rather than adding complex components or mechanisms
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
This configuration enhances the stability of secondary batteries by safely releasing internal gases, preventing explosions and maintaining performance and life characteristics.
Implementation Method 1
an internal temperature of a secondary battery may increase and gases may be generated in the secondary battery, resulting in an increase in an internal pressure of the secondary battery
Implementation Method 2
the cap-up is configured to rupture when a safety vent operates so that internal gases in a case can be easily released
Data Source
AI summary
A secondary battery includes: an electrode assembly; a case accommodating the electrode assembly; and a cap assembly coupled to a top portion of the case. The cap assembly includes a safety vent and a cap-up. The cap-up has grooves on a surface thereof. The safety vent includes a downwardly protruding portion, is under the cap-up, and is electrically connected to the electrode assembly at the protruding portion.