Wound Secondary Battery Lid Clearance for Vibration Resistance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Secondary batteries for vehicles and flying objects face challenges in withstanding vibrations, leading to potential damage and reduced performance due to inadequate structural design and materials.
Innovation Solution
A secondary battery design featuring a wound electrode group with specific internal insulation and structural components, such as a metal container or laminated film, and a lid with insulating layers, which maintains a controlled distance between the electrode group and the lid to absorb vibrations and prevent damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the battery uses a conventional structure without sufficient internal insulation, then the device complexity is reduced, but the vibration resistance deteriorates
Solution Approach 1:
An insulating layer is introduced as an intermediary component between the wound electrode group and the lid. This insulating layer serves multiple functions: it prevents electrical short circuits, provides mechanical cushioning against vibrations, and maintains proper spacing. The insulating layer includes a first insulating layer and a second insulating layer that work together to protect the electrode group while adding minimal structural complexity.
Solution Approach 2:
The insulating layer is pre-installed between the electrode group and the lid to provide cushioning against future vibrations. This beforehand cushioning approach prevents damage before it occurs by absorbing vibrational stresses and preventing direct contact between components during operation.
2Reliability
If the battery increases internal insulation and protective structures, then the vibration resistance improves, but the manufacturing complexity increases
Solution Approach 1:
The insulating layer is constructed using thin film structures that are flexible yet effective at providing insulation and vibration protection. These thin films can be easily manufactured and assembled, reducing the overall manufacturing complexity while still achieving the desired vibration resistance and electrical insulation properties.
3Reliability
If the battery maintains a controlled distance between electrode group and lid, then the vibration resistance improves, but the volume efficiency decreases
Solution Approach 1:
The insulating layer is strategically positioned only where needed - between the wound electrode group and the lid - rather than throughout the entire battery structure. This localized approach provides the necessary vibration protection and electrical insulation while minimizing the overall volume occupied by non-active components, thus maintaining较好的 volume efficiency.
Data Source
Figure 1
Figure 2
Figure 3~4
AI summary
Embodiments according to the present invention provide a secondary battery, a battery module, a vehicle, a storage battery, and a flying object excellent in vibration resistance. A secondary battery according to an embodiment includes an exterior material including an opening portion and including a bottom, a wound electrode group housed in the exterior material in order for an insertion direction to be perpendicular to a winding axis, and a lid attached to the opening portion of the exterior material and including at least a plate-like member, a positive electrode terminal, and a negative electrode terminal. When a minimum distance between the lid and the wound electrode group is AMIN, 0.5 mm < AMIN < 2.0 mm is satisfied.