Sealed Battery Closing Plate Groove for Laser Weld Sealing
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Solution Overview
Problem
High-energy-density batteries face issues with insulator degradation and reduced airtightness due to reflected laser light during laser welding, which affects the insulating capacity and sealing integrity.
Innovation Solution
A groove is incorporated in the fitted portion between the battery case and closing plate, where laser welding is performed, to absorb reflected light and prevent it from reaching the insulator, thus protecting it from damage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If laser welding is performed on the fitted portion close to the insulator, then the sealing integrity of the battery is improved, but the insulator may be seared by reflected laser light causing degradation
Solution Approach 1:
A reflective barrier layer is introduced as an intermediary between the laser welding zone and the insulator. This layer reflects laser light away from the insulator, preventing searing while allowing the welding process to proceed. The barrier layer acts as a mediator that blocks the harmful interaction between reflected laser light and the insulator material.
Solution Approach 2:
The reflected laser light, which was originally a harmful factor causing insulator searing, is redirected by the reflective barrier layer to illuminate the welding zone more effectively. This converts the harmful reflected light into a beneficial element that enhances welding visibility and precision without damaging the insulator.
2Adaptability or versatility
If the incident angle of laser light deviates during welding, then welding flexibility is improved, but reflected light may reach the insulator causing degradation
Solution Approach 1:
The reflective barrier layer serves as a protective intermediary that intercepts laser light at various incident angles. Regardless of the welding angle used, the barrier layer reflects light away from the insulator, maintaining protection even when welding parameters vary for operational flexibility.
Solution Approach 2:
The reflective barrier layer is designed with optical properties that remain effective across a range of incident angles. By changing the optical parameters of the barrier (reflectivity, orientation), the system maintains its protective function while allowing welding operations to be performed with angle variations for accessibility and flexibility.
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
This solution effectively prevents insulator degradation and maintains the airtightness of the battery by ensuring that reflected laser light is absorbed within the groove, even if the incident angle deviates during welding.
Implementation Method 1
Reflected light is thus absorbed by wall surfaces of the groove, making it difficult for the reflected light to leak out of the groove
Implementation Method 2
Reflected light is thus absorbed by wall surfaces of the groove
Data Source
AI summary
A sealed battery includes: a battery case including an opening and housing an electrode body; a closing plate closing the opening; a fitted portion between the battery case and the closing plate; a collector terminal including an external connector exposed at an outer surface of the closing plate; and a resin insulator insulating the closing plate from the external connector. At least in an area where the fitted portion and the insulator are located closest to each other, a groove is provided in the fitted portion, and the fitted portion including the groove is subjected to laser welding.