Secondary Battery Terminal Coupling Mechanism for Low Resistance
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Solution Overview
Problem
Secondary battery terminals face inefficiencies in electricity collection and coupling force, leading to high terminal electric resistance due to lengthy current passages and inadequate coupling mechanisms.
Innovation Solution
The implementation of a coupling terminal system that connects collecting plates to terminal plates via protrusions and coupling terminals, utilizing a bolt-nut structure for secure attachment and preventing rotation, thereby reducing terminal electric resistance and enhancing coupling force.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a traditional terminal structure without a coupling terminal is used, then the structure is simpler, but the electricity collecting efficiency and coupling force are insufficient
Solution Approach 1:
The terminal is divided into distinct functional components: a collecting plate for electrical connection, a terminal plate for structural support, and a coupling terminal for secure attachment. This segmentation allows each component to optimize its specific function, improving overall electricity collection efficiency while maintaining manageable complexity through modular design.
Solution Approach 2:
The coupling terminal acts as an intermediary component that bridges the collecting plate and terminal plate. It provides a dedicated interface for electrical and mechanical coupling, ensuring reliable current passage while allowing the other components to focus on their primary functions without direct complex interaction.
2Reliability
If the current passage is lengthy in the traditional terminal structure, then the manufacturing is easier, but the terminal electric resistance increases
Solution Approach 1:
The coupling terminal integrates both electrical conduction and mechanical coupling functions into a single component. This merging eliminates the need for separate connection elements, shortening the current passage and reducing contact resistance while simplifying the overall current path configuration.
Solution Approach 2:
The coupling terminal is pre-configured with protrusions and receiving structures that establish optimal electrical contact paths before final assembly. This preliminary configuration ensures that the current passage is minimized and resistance is reduced from the outset, rather than requiring complex post-assembly adjustments.
3Strength
If a simple coupling mechanism is used, then the device complexity is lower, but the coupling force and stability are insufficient
Solution Approach 1:
The coupling terminal features asymmetric protrusions on one end and corresponding asymmetric receiving structures on the terminal plate. This asymmetry provides directional coupling force and prevents rotational movement, achieving strong stable coupling without requiring complex symmetric fastening mechanisms.
Solution Approach 2:
The coupling terminal's protrusions are designed to automatically align with and engage the receiving structures on the terminal plate during assembly. This self-aligning feature provides strong coupling force without requiring complex external alignment tools or multi-step fastening procedures.
4Reliability
If the coupling terminal can rotate during assembly, then the ease of operation is higher, but the coupling stability and electrical connection reliability deteriorate
Solution Approach 1:
The coupling terminal incorporates protrusions and receiving structures that are pre-configured to prevent rotational movement during the coupling process. These features create inherent mechanical constraints that actively counteract any tendency toward rotation, ensuring stable coupling without requiring additional anti-rotation fastening operations.
Data Source
AI summary
A secondary battery includes an electrode assembly; a first terminal electrically connected to the electrode assembly, wherein the first terminal includes a first collecting plate contacting the electrode assembly and having at least one opening; a first terminal plate comprising at least one protrusion extending into the at least one opening; and a first coupling terminal extending through the first terminal plate and electrically coupled to the first collecting plate; a case housing the electrode assembly; and a cap assembly sealing the case.