Cylindrical Battery Cap Assembly to Prevent Terminal Separation
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Solution Overview
Problem
Existing cylindrical secondary batteries require separate terminal components for the positive and negative electrodes, which can complicate manufacturing and increase the risk of terminal separation or electrolyte leakage.
Innovation Solution
The implementation of a cap assembly in a cylindrical secondary battery that concurrently houses both the positive and negative electrode terminals, utilizing a rivet terminal electrically connected to the second electrode plate and a cap plate connected to the crimping part, ensuring simultaneous terminal functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate terminal components are used for positive and negative electrodes, then terminal functionality is achieved, but device complexity increases and reliability decreases
Solution Approach 1:
The patent combines separate terminal components into a single integrated terminal assembly where the positive electrode terminal and negative electrode terminal are concurrently implemented in one cap assembly, reducing the number of parts and improving reliability by eliminating separation risks
Solution Approach 2:
The cap assembly serves multiple functions: it houses both positive and negative terminals, provides structural support, and enables concurrent implementation of both electrode terminals, thereby reducing overall device complexity while maintaining full functionality
2Ease of manufacture
If multiple separate terminal components are implemented, then electrode terminals are functional, but manufacturing complexity increases
Solution Approach 1:
By merging multiple terminal components into a single integrated cap assembly, the patent reduces the number of assembly steps and simplifies the manufacturing process, making it easier to produce while maintaining terminal functionality
3Strength
If separate terminal components are used, then terminal functionality is achieved, but structural integrity decreases
Solution Approach 1:
The integration of both electrode terminals into a single cap assembly creates a more unified and structurally sound construction, improving overall structural integrity by eliminating potential weak points at interfaces between separate components
Data Source
Figure 1A
Figure 1B
Figure 2~3
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.