Battery Cap Assembly With Aligned Vent Holes for Activation Gas Release
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Solution Overview
Problem
Secondary batteries face performance limitations due to gases generated during activation being trapped inside the can, which cannot be discharged, hindering further improvement in battery performance.
Innovation Solution
A cap assembly with a top cap, safety vent, and CID filter is designed to allow vertical alignment of top, vent, and CID holes, enabling the positive electrode tab to close or open the CID hole, facilitating gas discharge through these aligned holes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the can is sealed to protect the electrode assembly and electrolyte, then safety and protection are improved, but gas generated during activation cannot be discharged, worsening battery performance
Solution Approach 1:
The cap assembly is pre-configured with multiple holes (top hole, vent hole, CID hole) and a positive electrode tab that is initially positioned to close the CID hole. This preliminary arrangement allows the can to remain sealed during storage and transport while enabling gas discharge when needed during activation, thus resolving the contradiction between maintaining safety through sealing and improving performance through gas discharge capability.
2Productivity
If the cap assembly includes multiple holes for gas discharge, then battery performance is improved, but the risk of electrolyte leakage and foreign substance ingress increases, worsening safety
Solution Approach 1:
The positive electrode tab automatically closes the CID hole when not in use, and opens it when gas pressure builds up during activation. This self-regulating mechanism allows the cap assembly to maintain safety by closing holes during normal conditions while enabling performance improvement through automatic gas discharge when needed, without requiring external control systems.
3Ease of operation
If the top hole, vent hole, and CID hole are aligned vertically to enable gas discharge, then ease of operation is improved, but the structural complexity of the cap assembly increases, worsening manufacturing difficulty
Solution Approach 1:
The top hole, vent hole, and CID hole are merged into a single vertical alignment, creating a unified gas discharge pathway. This merging of multiple functional openings into one structured arrangement simplifies the overall cap assembly design while maintaining the ability to discharge gas effectively, thus improving ease of operation without proportionally increasing manufacturing 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 cap assembly effectively discharges gases generated during activation, improving battery performance by ensuring stable gas release while preventing electrolyte leakage and foreign substance ingress, enhancing safety and connectivity.
Implementation Method 1
The positive electrode tab may be made of a material having elastic restoring force so that the other end of the upper tab part is elastically in surface contact with the bottom surface of the CID filter
Data Source
AI summary
The present invention relates to a secondary battery. The secondary battery comprises: an electrode assembly; a can configured to accommodate the electrode assembly; an electrolyte impregnated into the electrode assembly while being injected into the can; and a cap assembly mounted on an opening of the can, wherein the cap assembly comprises: a top cap in which a top hole is formed to pass vertically; a safety vent which is provided under the top cap and in which a vent hole is formed to pass vertically; and a current interrupt device (CID) filter which is provided under the safety vent, to which a positive electrode tab provided in the electrode assembly is coupled, and in which a CID hole is formed to pass vertically, wherein the CID hole is closed or opened by the positive electrode tab.