Battery Terminal Softened Region for Stronger Welded Modules
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Solution Overview
Problem
Existing secondary batteries face challenges in achieving high energy density, high capacity, and improved weldability with connection members, particularly due to limitations in terminal design and structure.
Innovation Solution
The secondary battery includes a terminal with a softened region and a battery module that incorporates a connection member joined to this softened region, allowing for enhanced weldability and improved electrical connections among multiple batteries.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the terminal is made with high strength material to ensure structural integrity, then strength is improved, but weldability with connection members deteriorates
Solution Approach 1:
The terminal is designed with a softened region having different material properties (lower hardness, higher ductility) at the welding surface compared to the bulk terminal material. This local quality change enables the welding surface to deform plastically during welding, improving weldability while the bulk terminal maintains its high strength for structural integrity.
Solution Approach 2:
The material parameters of the terminal are changed by creating a softened region with altered hardness and ductility characteristics. This parameter change allows the terminal to transition from a uniformly hard structure to one with a gradient of properties, optimizing both strength and weldability at different locations.
2Ease of manufacture
If the terminal structure is simplified to reduce manufacturing complexity, then ease of manufacture is improved, but weldability and electrical connectivity deteriorate
Solution Approach 1:
The terminal incorporates a localized softened region with specific surface characteristics that enhance welding performance. This local modification achieves improved weldability and electrical connectivity without requiring complex overall terminal结构设计, maintaining manufacturing simplicity while solving the connectivity issue.
3Strength
If the terminal hardness is increased to improve impact resistance, then strength is improved, but weldability and stability deteriorate
Solution Approach 1:
The terminal is designed with a softened region at the welding surface that provides stability during welding operations, while the bulk terminal maintains high hardness for impact resistance. This spatial differentiation of material properties resolves the contradiction between impact resistance and welding stability.
Solution Approach 2:
The softened region is created in advance during terminal manufacturing, preparing the welding surface with optimal properties before the welding process. This preliminary action ensures welding stability is built into the terminal structure, eliminating the need for post-manufacturing adjustments.
Data Source
AI summary
A secondary battery, a battery module, and/or a method for manufacturing the secondary battery are disclosed. A secondary battery includes a case accommodating an electrode assembly, and a terminal coupled to the case, and the terminal includes a softened region.