Sealed Battery Shield Layout for Laser Weld Insulator Protection
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Solution Overview
Problem
High-energy-density batteries face issues during laser welding, where reflected laser light and spatters can cause degradation of the resin insulator, leading to reduced insulating capacity and airtightness.
Innovation Solution
A sealed battery design incorporating shields along the peripheral edge of the insulator, with a first shield portion extending vertically to block reflected laser light and a second shield portion bent to cover the insulator, preventing contact with spatters during welding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If laser welding is performed on the fitted portion between the battery case and the closing plate, then the airtightness of the battery is improved, but the resin insulator may be seared by reflected laser light or spatters, leading to degradation of insulating capacity and airtightness
Solution Approach 1:
A shield member is introduced as an intermediary component between the laser welding zone and the resin insulator. The shield member includes a first shield portion that blocks reflected laser light and a second shield portion that prevents spatters from reaching the insulator, thereby protecting the insulator without interfering with the laser welding process that ensures battery airtightness
Solution Approach 2:
The shield member is divided into functionally distinct segments: a first shield portion specifically designed to block reflected laser light, and a second shield portion specifically designed to prevent spatter contact with the insulator. This segmentation allows each portion to address a specific harmful effect independently, providing comprehensive protection while maintaining the integrity of the laser welding process
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
The shields effectively prevent searing of the insulator, maintaining its insulating capacity and the airtightness of the battery by blocking reflected light and spatters during the laser welding process.
Implementation Method 1
reflected laser light may be applied to an insulator
Implementation Method 2
performing laser welding in the course of manufacture of such a high-energy-density battery
Data Source
AI summary
A sealed battery includes: a battery case including an opening; a closing plate closing the opening; a collector terminal including an external connector exposed at an outer surface of the closing plate; a resin insulator insulating the closing plate from the external connector; a laser-welded region formed on a fitted portion between the battery case and the closing plate; and a shield. The shield includes: a first shield portion extending vertically or substantially vertically from the outer surface of the closing plate and located between the fitted portion and the insulator; and a second shield portion extending from the first shield portion to the insulator and covering a portion of a surface of the insulator.