Cylindrical Battery Cap Assembly Without Separate Bus Bars
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Cylindrical secondary batteries face structural limitations due to the need for separate bus bars to electrically connect the can and cap assembly, which complicates the battery pack or module design.
Innovation Solution
A cylindrical secondary battery design where the positive and negative electrodes are aligned in the same direction, allowing for simplified electrical connections through a rivet terminal and insulator configuration, eliminating the need for separate bus bars.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If separate bus bars are used to electrically connect the can and cap assembly, then reliable electrical connection is achieved, but device complexity increases and ease of manufacture deteriorates
Solution Approach 1:
The patent merges the can and cap assembly into a single integrated structure where the cap assembly is directly coupled to the can. The positive electrode collecting plate serves dual functions as both the cap assembly and the electrical connection terminal, eliminating the need for separate bus bars. This integration maintains reliable electrical connection while significantly reducing structural complexity.
Solution Approach 2:
The cap assembly is designed to perform multiple functions: it seals the upper opening of the can, provides structural support, and serves as the positive electrode collecting plate for electrical connection. This multi-functionality eliminates the need for separate dedicated bus bar components, reducing overall device complexity while maintaining connection reliability.
2Reliability
If separate bus bars are used for electrical connection, then electrical connectivity is ensured, but ease of manufacture deteriorates due to additional welding requirements
Solution Approach 1:
By combining the cap assembly and positive electrode collecting plate into a single integrated component, the patent reduces the number of welding operations required. The integrated structure requires welding only at the interface between the can and cap assembly, rather than requiring separate welding of bus bars to both the can and cap, thereby improving ease of manufacture while ensuring electrical connectivity.
3Stability of the object's composition
If positive and negative electrodes are disposed in opposite directions, then conventional battery structure is maintained, but adaptability for battery pack design deteriorates
Solution Approach 1:
The patent employs asymmetric electrode arrangement where both positive and negative electrodes extend in the same direction (axially) from the electrode assembly, rather than the conventional opposite directions. This asymmetric configuration, combined with the integrated cap assembly design, provides superior adaptability for battery pack designs requiring unidirectional current flow and simplified connection arrangements.
Data Source
AI summary
A cylindrical secondary battery includes: an electrode assembly including a first electrode plate and a second electrode plate; a can having a bottom part and a cylindrical side part, configured to accommodate the electrode assembly, and electrically connected to the first electrode plate; and a cap assembly. The cap assembly includes: a cap plate coupled to one end of the cylindrical side part and electrically connected to the cylindrical side part; and a rivet terminal insulated from the cap plate and electrically connected to the second electrode plate.