Cylindrical Battery Label Breakage Prevention
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Solution Overview
Problem
Cylindrical batteries with doubly wound and tightened lids face issues with the outer packaging label breaking due to external impacts, leading to potential short circuits between the positive and negative electrodes.
Innovation Solution
The battery case's opening-side outer peripheral portion is reduced in diameter radially, and an insulating outer packaging label is applied, with a specific thickness range (0.1 mm ≤ T1 ≤ 0.5 mm) and diameter range (1.2×T1 ≤ D ≤ 2.7×T1) to prevent label breakage, ensuring the label is not damaged by external impacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the opening of the battery case is doubly wound and tightened to be sealed by an outer peripheral portion of a lid, then the sealing reliability is improved, but a space portion (gap) is generated between the outer peripheral surface of the battery case and the outer packaging label, making the label susceptible to breakage from external impacts
Solution Approach 1:
The invention changes the geometric parameters of the battery case by reducing its diameter in the radial direction at the opening-side outer peripheral portion. This parameter modification creates a stepped structure that eliminates the harmful space portion while maintaining the doubly wound and tightened sealing mechanism, thereby preventing label breakage from external impacts
Solution Approach 2:
The battery case is segmented into different radial sections: a main body portion with a larger diameter and an opening-side outer peripheral portion with a reduced diameter. This segmentation creates a stepped configuration that provides structural support to the outer packaging label, preventing it from being exposed to external impacts while preserving the sealing function
2Reliability
If the outer peripheral surface of the battery case is covered with an insulating outer packaging label, then the protection against short circuit between positive and negative electrodes is improved, but the label becomes vulnerable to breakage when a space portion exists near the wound and tightened position
Solution Approach 1:
The stepped structure of the battery case acts as a pre-established protective element that cushions and absorbs external impacts before they can reach the outer packaging label. This prior cushioning mechanism prevents the label from being subjected to damaging forces, thereby maintaining its integrity and insulating function
Solution Approach 2:
The reduced-diameter opening-side outer peripheral portion of the battery case serves as an intermediary protective structure between the outer packaging label and external impacts. This intermediary element absorbs the mechanical stress from external forces, preventing direct transmission to the label and maintaining both the label's strength and its short-circuit protection function
Data Source
AI summary
A cylindrical battery including a battery case and a lid, the battery case having an opening doubly wound and tightened to be sealed by an outer peripheral portion of the lid, wherein an opening-side outer peripheral portion of the battery case has a diameter reduced inward in the radial direction, an outer peripheral surface of the battery case is covered with a label, a space surrounded by the outer peripheral surface of the battery case, the outer peripheral portion of the lid, and the label is provided, and 1.2×T1≤D≤2.7×T1 is satisfied in a range of 0.1 mm≤T1≤0.5 mm, where D is a diameter of an inscribed circle that is tangent to the outer peripheral surface of the battery case, the outer peripheral portion of the lid, and the label, and T1 is a thickness of the battery case.