Clad Unit Dissimilar Metal Welding Battery Terminal
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing secondary battery terminal units face challenges with reduced weldability and bonding strength due to dissimilar metal welding between electrode rivets, rivet terminals, and bus bars, leading to instability in electrical connections.
Innovation Solution
The implementation of a clad unit with an outer layer of dissimilar metal and an inner layer of similar metal between the electrode rivet and rivet terminal, and between the rivet terminal and bus bar, allowing for similar metal welding to enhance bonding strength and stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If dissimilar metal welding is used between electrode rivets and rivet terminals, then electrical connection is achieved, but weldability and bonding strength are reduced
Solution Approach 1:
The patent applies composite materials by creating a clad unit with a first metallic material layer (same as electrode rivet) and a second metallic material layer (same as rivet terminal). This composite structure enables the terminal unit to achieve both electrical connection compatibility and high weldability/bonding strength by combining different metallic materials in a layered configuration.
Solution Approach 2:
The clad unit acts as an intermediary between the electrode rivet and rivet terminal. The first metallic material layer interfaces with the electrode rivet while the second metallic material layer interfaces with the rivet terminal, mediating the connection between dissimilar metals and enabling reliable welding at both interfaces.
2Adaptability or versatility
If dissimilar metal welding is performed between rivet terminals and bus bars, then electrical connection is established, but bonding strength deteriorates
Solution Approach 1:
The clad unit's second metallic material layer is selected to match the bus bar material, enabling direct welding between the clad unit and bus bar without dissimilar metal welding. This composite structure maintains high bonding strength while establishing electrical connection across different metal types.
Solution Approach 2:
The terminal unit employs local quality by having different metallic material layers at different locations: the first layer matches the electrode rivet material at the rivet interface, while the second layer matches the rivet terminal and bus bar materials at their respective interfaces. This localized material selection optimizes both weldability and electrical connection at each specific interface.
3Reliability
If similar metal welding is used throughout, then bonding strength is maintained, but adaptability to different metal combinations is reduced
Solution Approach 1:
The clad unit with its multi-layer composite structure enables the system to maintain similar metal welding at each interface while adapting to different metal combinations in the overall assembly. The first layer enables similar metal welding with the electrode rivet, while the second layer enables similar metal welding with the rivet terminal and bus bar, thus achieving both goals simultaneously.
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 ensures a stable and solid bonding structure, preventing reductions in weldability and maintaining electrical integrity by performing similar metal welding, thereby improving the reliability of secondary battery connections.
Implementation Method 1
The outer layer may be welded to the rivet terminal.
Implementation Method 2
The electrode rivet may be welded to the inner layer of the clad unit.
Implementation Method 3
The electrode rivet may be engaged with the clad unit.
Data Source
AI summary
A secondary battery and a secondary battery module, the secondary battery including an electrode assembly, the electrode assembly including a positive electrode, a negative electrode, and a separator therebetween; a case for accommodating the electrode assembly; a cap plate for sealing the case; and at least one terminal unit, the at least one terminal unit including an electrode rivet electrically connected to one of the electrodes of the electrode assembly and formed of a first metallic material, a rivet terminal formed of a second metallic material, the second metallic material being different from the first metallic material, and a clad unit between the electrode rivet and the rivet terminal.