Secondary Battery Terminal Structure Without Connecting Pieces
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Solution Overview
Problem
The existing structure of lithium batteries used in electric tools and vehicles requires a connecting piece that increases production costs, complexity, and internal cell thickness, reducing the utilization of space and energy density.
Innovation Solution
The proposed secondary battery design omits the connecting piece by directly connecting electrode terminals to tabs via extension parts, simplifying production and increasing contact area, thereby improving energy density and stability while reducing the probability of open circuits and enhancing safety through insulator isolation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a connecting piece is used to connect tabs to electrode terminals, then the connection stability is improved, but the device complexity and production cost increase
Solution Approach 1:
The patent removes the connecting piece from the battery structure, directly connecting the tabs to the electrode terminals. This extraction of the intermediate component simplifies the overall structure, reduces production steps, and lowers costs while maintaining connection stability through direct welding or bonding of tabs to terminals.
Solution Approach 2:
The patent merges the function of the connecting piece into the electrode terminal itself by extending the terminal to directly contact and connect with the tabs. This integration eliminates the need for a separate connecting component, reducing part count and assembly complexity while ensuring reliable electrical connection.
2Reliability
If a connecting piece is used to connect tabs to electrode terminals, then the connection stability is improved, but the manufacturing cost increases
Solution Approach 1:
By removing the connecting piece, the patent reduces material costs, assembly costs, and production complexity. The direct connection approach requires fewer manufacturing steps and less material, thereby lowering overall production costs while maintaining connection reliability through optimized tab-to-terminal contact.
Solution Approach 2:
The patent eliminates the need for expensive connecting pieces by using a simpler, more cost-effective direct connection method. The electrode terminal itself serves as the connection element, reducing material and manufacturing costs associated with separate connecting components.
3Reliability
If a connecting piece is used, then the connection function is achieved, but the internal space of the cell increases
Solution Approach 1:
The patent removes the connecting piece that occupied internal cell space, allowing for more efficient use of the available volume. The direct connection between tabs and electrode terminals eliminates the need for additional structural components, maximizing the energy-dense active material volume.
Solution Approach 2:
The patent optimizes the spatial arrangement by having electrode terminals extend in specific directions to directly contact tabs, utilizing the available three-dimensional space more efficiently. This dimensional optimization eliminates wasted space that would have been required for separate connecting pieces.
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
This design simplifies production procedures, reduces costs, enhances energy density, improves current passing performance, and increases the safety of lithium batteries by eliminating the need for a connecting piece and optimizing the internal space utilization.
Implementation Method 1
the extension parts are fixedly connected to the tabs
Implementation Method 2
insulators arranged between the top cover plate and the cell assemblies and configured to isolate the cell assemblies from the top cover plate
Data Source
AI summary
A secondary battery, a battery module and an electrical device are provided. The secondary battery includes a top cover plate, cell assemblies, and insulators arranged between the top cover plate and the cell assemblies and configured to isolate the cell assemblies from the top cover plate. Each of the cell assemblies includes a cell body and tabs arranged on the cell body; the secondary battery includes electrode terminals, the electrode terminals pass through the top cover plate and the insulators and being connected to the tabs. Bottom ends of the electrode terminals extend along the bottom surfaces of the insulators to form extension parts. The extension parts are fixedly connected to the tabs. According to the disclosure, a connecting piece is omitted, and production parts and procedures are simplified, thereby facilitating reduction of the production cost.