Battery U-Shaped Lead Laser Welding Sputtering Suppression
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Solution Overview
Problem
The challenge is to suppress sputtering in batteries caused by energy beam radiation during the welding process while maintaining battery capacity, as increased lead thickness to prevent sputtering reduces energy density and capacity.
Innovation Solution
A battery design featuring a U-shaped lead portion that is folded inward and welded to the exterior package can using energy beams, preventing sputtering without increasing lead thickness, thus maintaining capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If lead thickness is increased to suppress sputtering, then sputtering is suppressed, but battery capacity decreases
Solution Approach 1:
The lead is divided into multiple sections with different thicknesses: a thicker first lead section for welding that contacts the exterior package can, and a thinner second lead section for energy storage. This segmentation allows the welding portion to suppress sputtering while the thinner storage portion maintains battery capacity.
Solution Approach 2:
Different portions of the lead have different thickness properties localized to their specific functions. The first lead section has increased thickness specifically at the welding location to suppress sputtering, while the second lead section maintains thinner dimensions to preserve energy density and battery capacity.
2Strength
If resistance welding is used to connect exterior package can and lead, then connection is achieved, but metal foreign materials intrude into battery
Solution Approach 1:
The patent replaces resistance welding (mechanical/electrical system) with laser beam welding (optical system). The laser beam welds the lead to the exterior package can from the outside without causing sputtering that would generate metal foreign materials, while still achieving strong connection.
3Strength
If energy beams are radiated from outside exterior package can to weld lead, then welding is achieved, but sputtering occurs when molten portion penetrates lead
Solution Approach 1:
The lead is segmented into a first thicker section for welding and a second thinner section for energy storage. The increased thickness of the first lead section prevents the molten portion from penetrating through during laser welding, thereby suppressing sputtering while maintaining welding strength.
Solution Approach 2:
The lead structure is pre-designed with a thicker first lead section before the welding process. This preliminary structural preparation ensures that when energy beams are applied, the molten portion cannot penetrate the lead, thus preventing sputtering from occurring.
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 approach effectively suppresses foreign material intrusion from sputtering while preserving battery capacity by ensuring the welding process does not penetrate the lead, thereby maintaining energy density.
Implementation Method 1
the exterior package can and at least a part of a portion of the U-shaped portion which is in contact with the exterior package can are welded to each other with a welding portion formed by energy beams radiated from the outside of the exterior package can
Implementation Method 2
when a molten portion formed at the exterior package can and a lead by the above radiation penetrates the lead
Data Source
AI summary
The present disclosure aims, in a battery, to suppress intrusion of foreign materials generated by sputtering in the battery while a decrease in battery capacity is suppressed. A battery according to one embodiment of the present disclosure includes an exterior package can (51) which receives an electrode body, the electrode body includes a lead connected to one of a positive electrode and a negative electrode, the lead has a U-shaped portion (18) having a cross-sectional U shape formed by folding, and at least a part of a portion of the U-shaped portion which is in contact with the exterior package can (51) and the exterior package can (51) are welded to each other with a welding portion formed by energy beams radiated from the outside of the exterior package can (51).