Cylindrical Battery Insulating Member for Stable Cell Positioning
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Solution Overview
Problem
Cylindrical batteries face issues with soft separators providing weak support, leading to instability and insulation failures due to relative displacement between the insulating member and the cell, affecting the electrical connection and life of the battery.
Innovation Solution
A cylindrical battery design with an insulating member featuring a body portion and a convex portion that extends towards the cell, accommodated in a vacancy portion of the cell's second end, providing support and limiting the insulating member's position, ensuring stable electrical connections and insulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a soft separator is used at the outermost side of the cell end, then the separator can provide insulation between positive and negative poles, but the separator has weak supporting force and causes cell instability
Solution Approach 1:
An insulating member is introduced as an intermediary component between the cell and the housing. This insulating member includes a body portion and a convex portion, where the convex portion fits into a vacancy portion at the end of the cell. The insulating member provides both insulation and structural support, resolving the contradiction between needing a soft separator for insulation and requiring stable cell support.
2Reliability
If the insulating member is arranged between the cell and housing for insulation, then insulation performance is improved, but the insulating member and cell are prone to relative displacement affecting insulation effect
Solution Approach 1:
The convex portion of the insulating member is nested into the vacancy portion at the end of the cell. This nested structure creates a mechanical interlock that prevents relative displacement between the insulating member and the cell, while maintaining the insulation effect. The convex portion acts as a positioning feature that stabilizes the insulating member's position.
3Ease of operation
If the separator is placed at the outermost side of the cell end, then the positive and negative pole tabs can be led out on the same side, but the soft separator provides weak support and affects electrical connection reliability
Solution Approach 1:
The insulating member serves as a mediator that provides structural support at the cell end where the positive and negative pole tabs are led out. By placing the insulating member between the cell and housing, with the convex portion fitting into the vacancy portion, it stabilizes the cell end structure, ensuring reliable welding of the tabs while maintaining the convenience of having tabs led out on the same side.
Data Source
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AI summary
A cylindrical battery and a battery device are provided. The cylindrical battery includes a housing (100) and a cell, wherein the cell is located inside the housing (100); the cell includes a roll core body (200), a positive pole tab and a negative pole tab; the roll core body (200) has first ends and second ends (220) which are opposite in an axial direction (X) of the cylindrical battery; the positive pole tab and the negative pole tab are both located at the first end; an insulating member (300) is provided between the second end (220) and the housing (100); wherein the insulating member (300) includes a body portion (310) and a convex portion (320) which is located on a side of the body portion (310) facing towards the cell and extends towards the cell; and the second end (220) has a vacancy portion.