Cylindrical Battery Current Collector With Elastic Vibration Damping
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Solution Overview
Problem
Cylindrical secondary batteries face issues with vibration resistance due to empty spaces created by protruding substrates in current collecting structures, leading to increased stress on welding points and potential damage from external vibrations.
Innovation Solution
The implementation of a current collecting structure featuring elastic parts integrated with or separately coupled to current collecting plates, which absorb shocks and distribute stress, eliminating the need for lead tabs and reducing material costs and component resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a plurality of substrates protrude from electrode plates and are connected with conductive wires, then the resistance of the electrode assemblies is reduced, but empty spaces are created in the electrode plate region causing substrates to bend or compact under vibration
Solution Approach 1:
The patent applies this principle by using a flexible adhesive layer instead of rigid conductive wires to connect substrates. The adhesive layer accommodates vibration and movement while maintaining electrical connectivity, preventing substrate bending and compaction that occurs with rigid wire connections.
Solution Approach 2:
The patent uses an adhesive layer as an intermediary between substrates and the electrode assembly structure. This intermediary absorbs mechanical stress from vibration while maintaining the electrical connection, solving both the connectivity and stability problems simultaneously.
2Reliability
If substrates are gathered and connected with lead tabs directly welded to the can, then vibration resistance is improved, but design freedom is hindered and additional material costs and processes are required
Solution Approach 1:
The patent merges the functions of lead tabs and adhesive connections into a single integrated adhesive layer system. This eliminates the need for separate lead tab components and welding processes, reducing structural complexity while maintaining vibration resistance through the flexible adhesive connection.
Solution Approach 2:
The patent extracts the lead tab component and welding process from the current collecting structure, replacing them with a simpler adhesive-based connection system that achieves the same vibration resistance function without the additional complexity.
3Reliability
If lead tabs are added to connect substrates to the can, then electrical connectivity is improved, but component resistance increases and material costs rise
Solution Approach 1:
The patent replaces expensive lead tabs and welding processes with a more economical adhesive layer that provides sufficient electrical connectivity. The adhesive material is less costly and creates lower resistance connections compared to the traditional lead tab assembly.
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
The elastic parts effectively absorb external vibrations, minimizing the risk of substrate compaction and enhancing the overall vibration resistance of the battery, while maintaining electrical connectivity without compromising battery capacity.
Implementation Method 1
an elastic part elastically deformed in the longitudinal direction of the electrode assembly
Data Source
AI summary
An embodiment of the present invention relates to a cylindrical secondary battery in which the current collecting structure has been improved. According to the present invention, an elastic part is provided integrally with or separably from a current collecting plate, and thus shocks from external vibration can be absorbed. Thus, the issue in which the substrate of an electrode assembly is squashed or compacted can be minimized.