Cylindrical Battery Cover Assembly for Added Gas Storage Space
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Solution Overview
Problem
Existing columnar secondary batteries have limited gas storage space, leading to undesirable pressure changes and potential early activation of the explosion-proof valve before reaching extreme conditions, reducing efficiency and safety.
Innovation Solution
Increase the gas storage space by creating a spacing between the cover assembly protrusion and the current collecting member, using a thickening part to elevate the current collecting member, and incorporate a pad and through holes for enhanced gas discharge and vibration support.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If the gas storage space is increased, then the battery can accommodate more gas and prevent premature pressure changes, but the internal space available for other components is reduced
Solution Approach 1:
The protrusion extends in the axial direction (first direction) from the cover assembly toward the electrode assembly, creating gas storage space by utilizing the vertical dimension rather than expanding radially. This allows gas storage without increasing the battery's external diameter, effectively adding space in one dimension without compromising the overall compact form factor.
Solution Approach 2:
The protrusion is nested within the opening of the housing, fitting into the existing structural space between the cover assembly and the electrode assembly. This nested configuration creates additional gas storage volume by utilizing previously unused space within the battery's existing envelope, rather than requiring additional external volume.
2Reliability
If the spacing between the protrusion and the current collecting member is increased to create gas storage space, then gas exhaust is improved, but the structural stability and electrical connection reliability may be compromised
Solution Approach 1:
The thickening part acts as an intermediary element between the protrusion and the current collecting member. It provides mechanical support to maintain the spacing required for gas storage while ensuring reliable electrical connection through the welding connection. The thickening part distributes stresses and prevents deformation that could compromise either gas storage or electrical connectivity.
Solution Approach 2:
The thickening part is located specifically at the position where structural support and electrical connection are most critical, rather than uniformly thickening the entire current collecting member. This localized reinforcement provides the necessary structural stability and electrical reliability only where needed, while maintaining the overall spacing for gas storage in other regions.
3Volume of stationary object
If the first current collecting member is elevated using a thickening part, then gas storage space is created, but the manufacturing complexity increases
Solution Approach 1:
The thickening part is integrated as an integral portion of the first current collecting member, combining the current collection function with the structural support function in a single component. This merging eliminates the need for separate support structures or additional assembly steps, reducing manufacturing complexity despite the increased functional requirements.
Solution Approach 2:
The thickening part modifies the geometric parameters of the current collecting member by increasing its thickness at a specific location. This parameter change creates the necessary gas storage spacing while maintaining the same basic component structure and material properties, avoiding the need for complex multi-component assemblies or specialized manufacturing processes.
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
Ensures smooth gas exhaust, prevents premature pressure changes, enhances safety by reducing vibration-induced defects, and maintains battery integrity during extreme conditions.
Implementation Method 1
a thickening part is disposed on the first current collecting member and directly contacts the cover assembly, and the thickening part is welded to the cover assembly
Implementation Method 2
a pad is disposed between the cover assembly and the first current collecting member... avoiding defects in the electrode assembly due to battery vibration
Implementation Method 3
a through hole is disposed on the first current collecting member, and at least a part of the through hole is exposed by the pad
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
Disclosed are a secondary battery (100) and an electronic device (1000). The secondary battery (100) includes: a housing (110), having a peripheral sidewall (112) with one end defining an opening (113); an electrode assembly (130) accommodated in the housing (110); a cover assembly (140) covering the opening (113) and welded with the peripheral sidewall (112), having a protrusion (145) protruding toward the electrode assembly (130) for being inserted into the opening (113) and fitting against the peripheral sidewall (112); a first current collecting member (150) disposed between the cover assembly (140) and the electrode assembly (130), electrically connected to the cover assembly (140) and the electrode assembly (130), wherein, in a first direction (Z) from the electrode assembly (130) to the cover assembly (140), a spacing (119) at least partially used as a gas storage space is between the protrusion (145) and the first current collecting member (150).