Cylindrical Battery Cap Assembly With Dual Electrode Terminals
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Solution Overview
Problem
Conventional cylindrical secondary batteries do not efficiently integrate both positive and negative electrode terminals within the cap assembly, leading to potential electrical contact issues and leakage risks.
Innovation Solution
A cylindrical secondary battery design that incorporates a cap assembly with a rivet terminal connected to the positive electrode plate and a cap plate functioning as the negative electrode terminal, utilizing insulating gaskets and conductive adhesives or welding for secure electrical connections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional cylindrical secondary batteries use a single cap assembly structure, then the manufacturing process is simple, but both positive and negative electrode terminals cannot be efficiently integrated
Solution Approach 1:
The patent merges the positive electrode terminal (rivet terminal) and negative electrode terminal (cap plate) into a single cap assembly structure. The rivet terminal penetrates through the cap plate to provide electrical connection, while the cap plate itself serves as the negative terminal. This integration allows both terminals to be concurrently implemented in one assembly, resolving the contradiction between terminal integration capability and structural complexity.
Solution Approach 2:
The cap plate serves multiple functions: it acts as the negative electrode terminal, provides structural support, and serves as a mounting base for the rivet terminal. The crimping part of the case also performs dual functions by mechanically securing the cap plate while providing electrical connection. This multi-functionality enables efficient terminal integration without proportionally increasing overall structural complexity.
2Reliability
If the cap plate and crimping part are connected by conductive adhesive or welding, then electrical connection is improved, but manufacturing complexity increases
Solution Approach 1:
The patent introduces conductive adhesive or welding as an intermediary connection method between the cap plate and crimping part. This intermediary approach provides reliable electrical connection and mechanical bonding without requiring complex integrated structures. The choice of connection method balances electrical reliability with manufacturing feasibility, allowing flexible production processes.
3Object-affected harmful factors
If insulating gaskets are used between beading part and crimping part, then leakage prevention is improved, but the number of components increases
Solution Approach 1:
The patent extracts the sealing function into a separate insulating gasket component positioned between the beading part and crimping part. This dedicated sealing element prevents electrolyte leakage at the critical junction without requiring the main cap plate or case structures to perform dual sealing functions. The extracted sealing component simplifies the overall design by assigning specific functions to specific parts.
Solution Approach 2:
The insulating gasket serves as an intermediary sealing element that prevents electrolyte leakage between the beading part and crimping part. This mediator component provides both mechanical sealing and electrical insulation, preventing harmful factors (leakage and potential short circuits) without requiring complex integrated solutions in the main structural components.
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
Enhances electrical integration and reduces leakage risks by concurrently implementing both electrode terminals, ensuring stable electrical connections and improved safety.
Implementation Method 1
an outer surface of the crimping part and the cap plate may be connected to each other by a conductive adhesive
Implementation Method 2
the crimping part and the cap plate may be connected to each other by a welding region
Data Source
AI summary
A secondary battery is provided in which a first electrode (negative electrode) terminal and a second electrode (positive electrode) terminal may be concurrently (e.g., simultaneously) implemented in a cap assembly. A secondary battery includes: a case including a beading part and a crimping part; an electrode assembly physically coupled to the case and including a first electrode plate and a second electrode plate, the first electrode plate being electrically connected to the case; a first insulating gasket between the beading part and the crimping part; a cap plate coupled between the beading part and the crimping part through the first insulating gasket; a second insulating gasket extending through and coupled to the cap plate; and a rivet terminal extending through and physically coupled to the second insulating gasket, wherein the rivet terminal is electrically connected to the second electrode plate of the electrode assembly.