Cylindrical Battery Top Cap Bent Area Crimping Deformation
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Solution Overview
Problem
Cylindrical batteries undergo deformation during the crimping process due to high pressure applied to the top cap, which can affect the stability and durability of the battery.
Innovation Solution
The cylindrical battery design includes a top cap with a bent area that buffers pressure, minimizing deformation during the crimping process. The central area is positioned higher than the edge area to collect gas and potentially relieve internal pressure, and the venting portion is configured to be more vulnerable to pressure increases.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a crimping process is performed to fix the top cap to the battery housing, then the top cap is securely fixed to the battery, but high pressure causes deformation of the top cap
Solution Approach 1:
The top cap includes a bent area with a first bent portion shaped to be convexly bent downward, positioned between the edge area and central area. This curved structure allows the bent area to elastically deform and buffer the high pressure applied during crimping, preventing permanent deformation of the top cap while maintaining secure fixation to the battery housing
2Reliability
If the central area is positioned higher than the edge area to collect gas, then gas accumulation and pressure relief are improved, but the structure becomes more complex
Solution Approach 1:
The bent area serves multiple functions: it buffers crimping pressure during manufacturing, provides structural support, and creates a gas collection chamber by positioning the central area higher than the edge area. This multi-functional design improves gas pressure management without adding separate components, thereby avoiding increased device 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
This design reduces deformation of the top cap during crimping, enhancing the stability and durability of the battery while also improving energy density and preventing potential gas-related issues.
Implementation Method 1
the pressure may be buffered through the bent portion. When pressure is applied toward the center and bottom of the top cap, only a slight deformation occurs in the bent portion because the bent portion is shaped to be bent
Implementation Method 2
The central area may be positioned higher than the edge area... the central area is configured to collect gas generated inside the battery, compared to the case where the central area is positioned lower than the edge area
Data Source
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AI summary
The present disclosure discloses a cylindrical battery having a structure with little deformation due to crimping pressure during the crimping process in the battery manufacturing process. A cylindrical battery according to one aspect of the present disclosure includes an electrode assembly having a first electrode and a second electrode, a battery housing configured to receive the electrode assembly through an opening formed at the top, and a top cap configured to cover the opening and including an edge area, a central area positioned further inward than the edge area, and a bent area that is positioned between the edge area and the central area and has a first bent portion shaped to be convexly bent downward.